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libavcodec: v4l2: add support for v4l2 mem2mem codecs

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This patchset enhances Alexis Ballier's original patch and validates
    it using Qualcomm's Venus hardware (driver recently landed upstream
    [1]).

    This has been tested on Qualcomm's DragonBoard 410c and 820c
    Configure/make scripts have been validated on Ubuntu 10.04 and
    16.04.

    Tested decoders:
           - h264
           - h263
           - mpeg4
           - vp8
           - vp9
           - hevc

    Tested encoders:
           - h264
           - h263
           - mpeg4

    Tested transcoding (concurrent encoding/decoding)

    Some of the changes introduced:
        - v4l2: code cleanup and abstractions added
        - v4l2: follow the new encode/decode api.
        - v4l2: fix display size for NV12 output pool.
        - v4l2: handle EOS (EPIPE and draining)
        - v4l2: vp8 and mpeg4 decoding and encoding.
        - v4l2: hevc and vp9 support.
        - v4l2: generate EOF on dequeue errors.
        - v4l2: h264_mp4toannexb filtering.
        - v4l2: fixed make install and fate issues.
        - v4l2: codecs enabled/disabled depending on pixfmt defined
        - v4l2: pass timebase/framerate to the context
        - v4l2: runtime decoder reconfiguration.
        - v4l2: add more frame information
        - v4l2: free hardware resources on last reference being released
        - v4l2: encoding: disable b-frames for upstreaming (patch required)

    [1] https://lwn.net/Articles/697956/

    System Level view:
        v42l_m2m_enc/dec --> v4l2_m2m --> v4l2_context --> v4l2_buffers

    Reviewed-by: Jorge Ramirez <jorge.ramirez-ortiz@linaro.org>
    Reviewed-by: Alexis Ballier <aballier@gentoo.org>
    Tested-by: Jorge Ramirez <jorge.ramirez-ortiz@linaro.org>

Signed-off-by: wm4 <nfxjfg@googlemail.com>
This commit is contained in:
Jorge Ramirez-Ortiz 2017-09-20 18:55:40 -07:00 committed by wm4
parent afe674734b
commit 1ef7752d64
14 changed files with 2757 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
Changelog
View File

@ -49,6 +49,7 @@ version <next>:
- VP9 tile threading support
- KMS screen grabber
- CUDA thumbnail filter
- V4L2 mem2mem HW assisted codecs
version 3.3:

28
configure vendored
View File

@ -185,6 +185,7 @@ Individual component options:
--enable-filter=NAME enable filter NAME
--disable-filter=NAME disable filter NAME
--disable-filters disable all filters
--disable-v4l2_m2m disable V4L2 mem2mem code [autodetect]
External library support:
@ -1628,6 +1629,7 @@ HWACCEL_AUTODETECT_LIBRARY_LIST="
vda
vdpau
videotoolbox
v4l2_m2m
xvmc
"
@ -2755,6 +2757,7 @@ omx_rpi_select="omx"
qsvdec_select="qsv"
qsvenc_select="qsv"
vaapi_encode_deps="vaapi"
v4l2_m2m_deps_any="linux_videodev2_h"
hwupload_cuda_filter_deps="cuda"
scale_npp_filter_deps="cuda libnpp"
@ -2765,6 +2768,8 @@ nvenc_deps="cuda"
nvenc_deps_any="dlopen LoadLibrary"
nvenc_encoder_deps="nvenc"
h263_v4l2m2m_decoder_deps="v4l2_m2m h263_v4l2_m2m"
h263_v4l2m2m_encoder_deps="v4l2_m2m h263_v4l2_m2m"
h264_crystalhd_decoder_select="crystalhd h264_mp4toannexb_bsf h264_parser"
h264_cuvid_decoder_deps="cuda cuvid"
h264_cuvid_decoder_select="h264_mp4toannexb_bsf"
@ -2783,6 +2788,8 @@ h264_vda_decoder_deps="vda"
h264_vda_decoder_select="h264_decoder"
h264_vdpau_decoder_deps="vdpau"
h264_vdpau_decoder_select="h264_decoder"
h264_v4l2m2m_decoder_deps="v4l2_m2m h264_v4l2_m2m"
h264_v4l2m2m_encoder_deps="v4l2_m2m h264_v4l2_m2m"
hevc_cuvid_decoder_deps="cuda cuvid"
hevc_cuvid_decoder_select="hevc_mp4toannexb_bsf"
hevc_mediacodec_decoder_deps="mediacodec"
@ -2794,12 +2801,15 @@ hevc_qsv_encoder_deps="libmfx"
hevc_qsv_encoder_select="hevcparse qsvenc"
hevc_vaapi_encoder_deps="VAEncPictureParameterBufferHEVC"
hevc_vaapi_encoder_select="vaapi_encode golomb"
hevc_v4l2m2m_decoder_deps="v4l2_m2m hevc_v4l2_m2m"
hevc_v4l2m2m_encoder_deps="v4l2_m2m hevc_v4l2_m2m"
mjpeg_cuvid_decoder_deps="cuda cuvid"
mjpeg_vaapi_encoder_deps="VAEncPictureParameterBufferJPEG"
mjpeg_vaapi_encoder_select="vaapi_encode jpegtables"
mpeg1_cuvid_decoder_deps="cuda cuvid"
mpeg1_vdpau_decoder_deps="vdpau"
mpeg1_vdpau_decoder_select="mpeg1video_decoder"
mpeg1_v4l2m2m_decoder_deps="v4l2_m2m mpeg1_v4l2_m2m"
mpeg2_crystalhd_decoder_select="crystalhd"
mpeg2_cuvid_decoder_deps="cuda cuvid"
mpeg2_mmal_decoder_deps="mmal"
@ -2810,6 +2820,7 @@ mpeg2_qsv_encoder_deps="libmfx"
mpeg2_qsv_encoder_select="qsvenc"
mpeg2_vaapi_encoder_deps="VAEncPictureParameterBufferMPEG2"
mpeg2_vaapi_encoder_select="vaapi_encode"
mpeg2_v4l2m2m_decoder_deps="v4l2_m2m mpeg2_v4l2_m2m"
mpeg4_crystalhd_decoder_select="crystalhd"
mpeg4_cuvid_decoder_deps="cuda cuvid"
mpeg4_mediacodec_decoder_deps="mediacodec"
@ -2817,6 +2828,8 @@ mpeg4_mmal_decoder_deps="mmal"
mpeg4_omx_encoder_deps="omx"
mpeg4_vdpau_decoder_deps="vdpau"
mpeg4_vdpau_decoder_select="mpeg4_decoder"
mpeg4_v4l2m2m_decoder_deps="v4l2_m2m mpeg4_v4l2_m2m"
mpeg4_v4l2m2m_encoder_deps="v4l2_m2m mpeg4_v4l2_m2m"
mpeg_vdpau_decoder_deps="vdpau"
mpeg_vdpau_decoder_select="mpeg2video_decoder"
msmpeg4_crystalhd_decoder_select="crystalhd"
@ -2827,16 +2840,20 @@ vc1_cuvid_decoder_deps="cuda cuvid"
vc1_mmal_decoder_deps="mmal"
vc1_vdpau_decoder_deps="vdpau"
vc1_vdpau_decoder_select="vc1_decoder"
vc1_v4l2m2m_decoder_deps="v4l2_m2m vc1_v4l2_m2m"
vp8_cuvid_decoder_deps="cuda cuvid"
vp8_mediacodec_decoder_deps="mediacodec"
vp8_qsv_decoder_deps="libmfx"
vp8_qsv_decoder_select="qsvdec vp8_qsv_hwaccel vp8_parser"
vp8_vaapi_encoder_deps="VAEncPictureParameterBufferVP8"
vp8_vaapi_encoder_select="vaapi_encode"
vp8_v4l2m2m_decoder_deps="v4l2_m2m vp8_v4l2_m2m"
vp8_v4l2m2m_encoder_deps="v4l2_m2m vp8_v4l2_m2m"
vp9_cuvid_decoder_deps="cuda cuvid"
vp9_mediacodec_decoder_deps="mediacodec"
vp9_vaapi_encoder_deps="VAEncPictureParameterBufferVP9"
vp9_vaapi_encoder_select="vaapi_encode"
vp9_v4l2m2m_decoder_deps="v4l2_m2m vp9_v4l2_m2m"
wmv3_crystalhd_decoder_select="crystalhd"
wmv3_vdpau_decoder_select="vc1_vdpau_decoder"
@ -6109,9 +6126,20 @@ perl -v > /dev/null 2>&1 && enable perl || disable perl
pod2man --help > /dev/null 2>&1 && enable pod2man || disable pod2man
rsync --help 2> /dev/null | grep -q 'contimeout' && enable rsync_contimeout || disable rsync_contimeout
# check V4L2 codecs available in the API
check_header linux/fb.h
check_header linux/videodev2.h
check_code cc linux/videodev2.h "struct v4l2_frmsizeenum vfse; vfse.discrete.width = 0;" && enable_safe struct_v4l2_frmivalenum_discrete
check_code cc linux/videodev2.h "int i = V4L2_CAP_VIDEO_M2M_MPLANE | V4L2_CAP_VIDEO_M2M | V4L2_BUF_FLAG_LAST;" || disable v4l2_m2m
check_code cc linux/videodev2.h "int i = V4L2_PIX_FMT_VC1_ANNEX_G;" && enable vc1_v4l2_m2m
check_code cc linux/videodev2.h "int i = V4L2_PIX_FMT_MPEG1;" && enable mpeg1_v4l2_m2m
check_code cc linux/videodev2.h "int i = V4L2_PIX_FMT_MPEG2;" && enable mpeg2_v4l2_m2m
check_code cc linux/videodev2.h "int i = V4L2_PIX_FMT_MPEG4;" && enable mpeg4_v4l2_m2m
check_code cc linux/videodev2.h "int i = V4L2_PIX_FMT_HEVC;" && enable hevc_v4l2_m2m
check_code cc linux/videodev2.h "int i = V4L2_PIX_FMT_H263;" && enable h263_v4l2_m2m
check_code cc linux/videodev2.h "int i = V4L2_PIX_FMT_H264;" && enable h264_v4l2_m2m
check_code cc linux/videodev2.h "int i = V4L2_PIX_FMT_VP8;" && enable vp8_v4l2_m2m
check_code cc linux/videodev2.h "int i = V4L2_PIX_FMT_VP9;" && enable vp9_v4l2_m2m
check_header sys/videoio.h
check_code cc sys/videoio.h "struct v4l2_frmsizeenum vfse; vfse.discrete.width = 0;" && enable_safe struct_v4l2_frmivalenum_discrete

15
libavcodec/Makefile
View File

@ -137,6 +137,7 @@ OBJS-$(CONFIG_VIDEODSP) += videodsp.o
OBJS-$(CONFIG_VP3DSP) += vp3dsp.o
OBJS-$(CONFIG_VP56DSP) += vp56dsp.o
OBJS-$(CONFIG_VP8DSP) += vp8dsp.o
OBJS-$(CONFIG_V4L2_M2M) += v4l2_m2m.o v4l2_context.o v4l2_buffers.o v4l2_fmt.o
OBJS-$(CONFIG_WMA_FREQS) += wma_freqs.o
OBJS-$(CONFIG_WMV2DSP) += wmv2dsp.o
@ -323,6 +324,8 @@ OBJS-$(CONFIG_H263_DECODER) += h263dec.o h263.o ituh263dec.o \
intelh263dec.o h263data.o
OBJS-$(CONFIG_H263_ENCODER) += mpeg4videoenc.o mpeg4video.o \
h263.o ituh263enc.o flvenc.o h263data.o
OBJS-$(CONFIG_H263_V4L2M2M_DECODER) += v4l2_m2m_dec.o
OBJS-$(CONFIG_H263_V4L2M2M_ENCODER) += v4l2_m2m_enc.o
OBJS-$(CONFIG_H264_DECODER) += h264dec.o h264_cabac.o h264_cavlc.o \
h264_direct.o h264_loopfilter.o \
h264_mb.o h264_picture.o \
@ -340,6 +343,8 @@ OBJS-$(CONFIG_H264_QSV_DECODER) += qsvdec_h2645.o
OBJS-$(CONFIG_H264_QSV_ENCODER) += qsvenc_h264.o
OBJS-$(CONFIG_H264_VAAPI_ENCODER) += vaapi_encode_h264.o vaapi_encode_h26x.o
OBJS-$(CONFIG_H264_VIDEOTOOLBOX_ENCODER) += videotoolboxenc.o
OBJS-$(CONFIG_H264_V4L2M2M_DECODER) += v4l2_m2m_dec.o
OBJS-$(CONFIG_H264_V4L2M2M_ENCODER) += v4l2_m2m_enc.o
OBJS-$(CONFIG_HAP_DECODER) += hapdec.o hap.o
OBJS-$(CONFIG_HAP_ENCODER) += hapenc.o hap.o
OBJS-$(CONFIG_HEVC_DECODER) += hevcdec.o hevc_mvs.o \
@ -353,6 +358,8 @@ OBJS-$(CONFIG_HEVC_QSV_DECODER) += qsvdec_h2645.o
OBJS-$(CONFIG_HEVC_QSV_ENCODER) += qsvenc_hevc.o hevc_ps_enc.o \
hevc_data.o
OBJS-$(CONFIG_HEVC_VAAPI_ENCODER) += vaapi_encode_h265.o vaapi_encode_h26x.o
OBJS-$(CONFIG_HEVC_V4L2M2M_DECODER) += v4l2_m2m_dec.o
OBJS-$(CONFIG_HEVC_V4L2M2M_ENCODER) += v4l2_m2m_enc.o
OBJS-$(CONFIG_HNM4_VIDEO_DECODER) += hnm4video.o
OBJS-$(CONFIG_HQ_HQA_DECODER) += hq_hqa.o hq_hqadata.o hq_hqadsp.o \
canopus.o
@ -422,6 +429,7 @@ OBJS-$(CONFIG_MPC8_DECODER) += mpc8.o mpc.o
OBJS-$(CONFIG_MPEGVIDEO_DECODER) += mpeg12dec.o mpeg12.o mpeg12data.o
OBJS-$(CONFIG_MPEG1VIDEO_DECODER) += mpeg12dec.o mpeg12.o mpeg12data.o
OBJS-$(CONFIG_MPEG1VIDEO_ENCODER) += mpeg12enc.o mpeg12.o
OBJS-$(CONFIG_MPEG1_V4L2M2M_DECODER) += v4l2_m2m_dec.o
OBJS-$(CONFIG_MPEG2_MMAL_DECODER) += mmaldec.o
OBJS-$(CONFIG_MPEG2_QSV_DECODER) += qsvdec_other.o
OBJS-$(CONFIG_MPEG2_QSV_ENCODER) += qsvenc_mpeg2.o
@ -429,9 +437,12 @@ OBJS-$(CONFIG_MPEG2VIDEO_DECODER) += mpeg12dec.o mpeg12.o mpeg12data.o
OBJS-$(CONFIG_MPEG2VIDEO_ENCODER) += mpeg12enc.o mpeg12.o
OBJS-$(CONFIG_MPEG2_MEDIACODEC_DECODER) += mediacodecdec.o
OBJS-$(CONFIG_MPEG2_VAAPI_ENCODER) += vaapi_encode_mpeg2.o
OBJS-$(CONFIG_MPEG2_V4L2M2M_DECODER) += v4l2_m2m_dec.o
OBJS-$(CONFIG_MPEG4_DECODER) += xvididct.o
OBJS-$(CONFIG_MPEG4_MEDIACODEC_DECODER) += mediacodecdec.o
OBJS-$(CONFIG_MPEG4_OMX_ENCODER) += omx.o
OBJS-$(CONFIG_MPEG4_V4L2M2M_DECODER) += v4l2_m2m_dec.o
OBJS-$(CONFIG_MPEG4_V4L2M2M_ENCODER) += v4l2_m2m_enc.o
OBJS-$(CONFIG_MPL2_DECODER) += mpl2dec.o ass.o
OBJS-$(CONFIG_MSA1_DECODER) += mss3.o
OBJS-$(CONFIG_MSCC_DECODER) += mscc.o
@ -605,6 +616,7 @@ OBJS-$(CONFIG_VC1_DECODER) += vc1dec.o vc1_block.o vc1_loopfilter.o
OBJS-$(CONFIG_VC1_CUVID_DECODER) += cuvid.o
OBJS-$(CONFIG_VC1_MMAL_DECODER) += mmaldec.o
OBJS-$(CONFIG_VC1_QSV_DECODER) += qsvdec_other.o
OBJS-$(CONFIG_VC1_V4L2M2M_DECODER) += v4l2_m2m_dec.o
OBJS-$(CONFIG_VC2_ENCODER) += vc2enc.o vc2enc_dwt.o diractab.o
OBJS-$(CONFIG_VCR1_DECODER) += vcr1.o
OBJS-$(CONFIG_VMDAUDIO_DECODER) += vmdaudio.o
@ -624,6 +636,8 @@ OBJS-$(CONFIG_VP8_CUVID_DECODER) += cuvid.o
OBJS-$(CONFIG_VP8_MEDIACODEC_DECODER) += mediacodecdec.o
OBJS-$(CONFIG_VP8_QSV_DECODER) += qsvdec_other.o
OBJS-$(CONFIG_VP8_VAAPI_ENCODER) += vaapi_encode_vp8.o
OBJS-$(CONFIG_VP8_V4L2M2M_DECODER) += v4l2_m2m_dec.o
OBJS-$(CONFIG_VP8_V4L2M2M_ENCODER) += v4l2_m2m_enc.o
OBJS-$(CONFIG_VP9_DECODER) += vp9.o vp9data.o vp9dsp.o vp9lpf.o vp9recon.o \
vp9block.o vp9prob.o vp9mvs.o vp56rac.o \
vp9dsp_8bpp.o vp9dsp_10bpp.o vp9dsp_12bpp.o
@ -631,6 +645,7 @@ OBJS-$(CONFIG_VP9_CUVID_DECODER) += cuvid.o
OBJS-$(CONFIG_VP9_MEDIACODEC_DECODER) += mediacodecdec.o
OBJS-$(CONFIG_VP9_VAAPI_ENCODER) += vaapi_encode_vp9.o
OBJS-$(CONFIG_VPLAYER_DECODER) += textdec.o ass.o
OBJS-$(CONFIG_VP9_V4L2M2M_DECODER) += v4l2_m2m_dec.o
OBJS-$(CONFIG_VQA_DECODER) += vqavideo.o
OBJS-$(CONFIG_WAVPACK_DECODER) += wavpack.o
OBJS-$(CONFIG_WAVPACK_ENCODER) += wavpackenc.o

9
libavcodec/allcodecs.c
View File

@ -208,8 +208,10 @@ static void register_all(void)
REGISTER_ENCDEC (H263, h263);
REGISTER_DECODER(H263I, h263i);
REGISTER_ENCDEC (H263P, h263p);
REGISTER_ENCDEC (H263_V4L2M2M, h263_v4l2m2m);
REGISTER_DECODER(H264, h264);
REGISTER_DECODER(H264_CRYSTALHD, h264_crystalhd);
REGISTER_ENCDEC (H264_V4L2M2M, h264_v4l2m2m);
REGISTER_DECODER(H264_MEDIACODEC, h264_mediacodec);
REGISTER_DECODER(H264_MMAL, h264_mmal);
REGISTER_DECODER(H264_QSV, h264_qsv);
@ -220,6 +222,7 @@ static void register_all(void)
REGISTER_ENCDEC (HAP, hap);
REGISTER_DECODER(HEVC, hevc);
REGISTER_DECODER(HEVC_QSV, hevc_qsv);
REGISTER_ENCDEC (HEVC_V4L2M2M, hevc_v4l2m2m);
REGISTER_DECODER(HNM4_VIDEO, hnm4_video);
REGISTER_DECODER(HQ_HQA, hq_hqa);
REGISTER_DECODER(HQX, hqx);
@ -254,6 +257,7 @@ static void register_all(void)
REGISTER_ENCDEC (MPEG2VIDEO, mpeg2video);
REGISTER_ENCDEC (MPEG4, mpeg4);
REGISTER_DECODER(MPEG4_CRYSTALHD, mpeg4_crystalhd);
REGISTER_ENCDEC (MPEG4_V4L2M2M, mpeg4_v4l2m2m);
REGISTER_DECODER(MPEG4_MMAL, mpeg4_mmal);
#if FF_API_VDPAU
REGISTER_DECODER(MPEG4_VDPAU, mpeg4_vdpau);
@ -263,8 +267,10 @@ static void register_all(void)
REGISTER_DECODER(MPEG_VDPAU, mpeg_vdpau);
REGISTER_DECODER(MPEG1_VDPAU, mpeg1_vdpau);
#endif
REGISTER_DECODER(MPEG1_V4L2M2M, mpeg1_v4l2m2m);
REGISTER_DECODER(MPEG2_MMAL, mpeg2_mmal);
REGISTER_DECODER(MPEG2_CRYSTALHD, mpeg2_crystalhd);
REGISTER_DECODER(MPEG2_V4L2M2M, mpeg2_v4l2m2m);
REGISTER_DECODER(MPEG2_QSV, mpeg2_qsv);
REGISTER_DECODER(MPEG2_MEDIACODEC, mpeg2_mediacodec);
REGISTER_DECODER(MSA1, msa1);
@ -362,6 +368,7 @@ static void register_all(void)
REGISTER_DECODER(VC1IMAGE, vc1image);
REGISTER_DECODER(VC1_MMAL, vc1_mmal);
REGISTER_DECODER(VC1_QSV, vc1_qsv);
REGISTER_DECODER(VC1_V4L2M2M, vc1_v4l2m2m);
REGISTER_ENCODER(VC2, vc2);
REGISTER_DECODER(VCR1, vcr1);
REGISTER_DECODER(VMDVIDEO, vmdvideo);
@ -373,7 +380,9 @@ static void register_all(void)
REGISTER_DECODER(VP6F, vp6f);
REGISTER_DECODER(VP7, vp7);
REGISTER_DECODER(VP8, vp8);
REGISTER_ENCDEC (VP8_V4L2M2M, vp8_v4l2m2m);
REGISTER_DECODER(VP9, vp9);
REGISTER_DECODER(VP9_V4L2M2M, vp9_v4l2m2m);
REGISTER_DECODER(VQA, vqa);
REGISTER_DECODER(BITPACKED, bitpacked);
REGISTER_DECODER(WEBP, webp);

453
libavcodec/v4l2_buffers.c Normal file
View File

@ -0,0 +1,453 @@
/*
* V4L2 buffer helper functions.
*
* Copyright (C) 2017 Alexis Ballier <aballier@gentoo.org>
* Copyright (C) 2017 Jorge Ramirez <jorge.ramirez-ortiz@linaro.org>
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <linux/videodev2.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <unistd.h>
#include <fcntl.h>
#include <poll.h>
#include "libavcodec/avcodec.h"
#include "libavcodec/internal.h"
#include "v4l2_context.h"
#include "v4l2_buffers.h"
#include "v4l2_m2m.h"
#define USEC_PER_SEC 1000000
static inline V4L2m2mContext *buf_to_m2mctx(V4L2Buffer *buf)
{
return V4L2_TYPE_IS_OUTPUT(buf->context->type) ?
container_of(buf->context, V4L2m2mContext, output) :
container_of(buf->context, V4L2m2mContext, capture);
}
static inline AVCodecContext *logger(V4L2Buffer *buf)
{
return buf_to_m2mctx(buf)->avctx;
}
static inline void v4l2_set_pts(V4L2Buffer *out, int64_t pts)
{
V4L2m2mContext *s = buf_to_m2mctx(out);
AVRational v4l2_timebase = { 1, USEC_PER_SEC };
int64_t v4l2_pts;
if (pts == AV_NOPTS_VALUE)
pts = 0;
/* convert pts to v4l2 timebase */
v4l2_pts = av_rescale_q(pts, s->avctx->time_base, v4l2_timebase);
out->buf.timestamp.tv_usec = v4l2_pts % USEC_PER_SEC;
out->buf.timestamp.tv_sec = v4l2_pts / USEC_PER_SEC;
}
static inline uint64_t v4l2_get_pts(V4L2Buffer *avbuf)
{
V4L2m2mContext *s = buf_to_m2mctx(avbuf);
AVRational v4l2_timebase = { 1, USEC_PER_SEC };
int64_t v4l2_pts;
/* convert pts back to encoder timebase */
v4l2_pts = avbuf->buf.timestamp.tv_sec * USEC_PER_SEC + avbuf->buf.timestamp.tv_usec;
return av_rescale_q(v4l2_pts, v4l2_timebase, s->avctx->time_base);
}
static enum AVColorPrimaries v4l2_get_color_primaries(V4L2Buffer *buf)
{
enum v4l2_ycbcr_encoding ycbcr;
enum v4l2_colorspace cs;
cs = V4L2_TYPE_IS_MULTIPLANAR(buf->buf.type) ?
buf->context->format.fmt.pix_mp.colorspace :
buf->context->format.fmt.pix.colorspace;
ycbcr = V4L2_TYPE_IS_MULTIPLANAR(buf->buf.type) ?
buf->context->format.fmt.pix_mp.ycbcr_enc:
buf->context->format.fmt.pix.ycbcr_enc;
switch(ycbcr) {
case V4L2_YCBCR_ENC_XV709:
case V4L2_YCBCR_ENC_709: return AVCOL_PRI_BT709;
case V4L2_YCBCR_ENC_XV601:
case V4L2_YCBCR_ENC_601:return AVCOL_PRI_BT470M;
default:
break;
}
switch(cs) {
case V4L2_COLORSPACE_470_SYSTEM_BG: return AVCOL_PRI_BT470BG;
case V4L2_COLORSPACE_SMPTE170M: return AVCOL_PRI_SMPTE170M;
case V4L2_COLORSPACE_SMPTE240M: return AVCOL_PRI_SMPTE240M;
case V4L2_COLORSPACE_BT2020: return AVCOL_PRI_BT2020;
default:
break;
}
return AVCOL_PRI_UNSPECIFIED;
}
static enum AVColorRange v4l2_get_color_range(V4L2Buffer *buf)
{
enum v4l2_quantization qt;
qt = V4L2_TYPE_IS_MULTIPLANAR(buf->buf.type) ?
buf->context->format.fmt.pix_mp.quantization :
buf->context->format.fmt.pix.quantization;
switch (qt) {
case V4L2_QUANTIZATION_LIM_RANGE: return AVCOL_RANGE_MPEG;
case V4L2_QUANTIZATION_FULL_RANGE: return AVCOL_RANGE_JPEG;
default:
break;
}
return AVCOL_RANGE_UNSPECIFIED;
}
static enum AVColorSpace v4l2_get_color_space(V4L2Buffer *buf)
{
enum v4l2_ycbcr_encoding ycbcr;
enum v4l2_colorspace cs;
cs = V4L2_TYPE_IS_MULTIPLANAR(buf->buf.type) ?
buf->context->format.fmt.pix_mp.colorspace :
buf->context->format.fmt.pix.colorspace;
ycbcr = V4L2_TYPE_IS_MULTIPLANAR(buf->buf.type) ?
buf->context->format.fmt.pix_mp.ycbcr_enc:
buf->context->format.fmt.pix.ycbcr_enc;
switch(cs) {
case V4L2_COLORSPACE_SRGB: return AVCOL_SPC_RGB;
case V4L2_COLORSPACE_REC709: return AVCOL_SPC_BT709;
case V4L2_COLORSPACE_470_SYSTEM_M: return AVCOL_SPC_FCC;
case V4L2_COLORSPACE_470_SYSTEM_BG: return AVCOL_SPC_BT470BG;
case V4L2_COLORSPACE_SMPTE170M: return AVCOL_SPC_SMPTE170M;
case V4L2_COLORSPACE_SMPTE240M: return AVCOL_SPC_SMPTE240M;
case V4L2_COLORSPACE_BT2020:
if (ycbcr == V4L2_YCBCR_ENC_BT2020_CONST_LUM)
return AVCOL_SPC_BT2020_CL;
else
return AVCOL_SPC_BT2020_NCL;
default:
break;
}
return AVCOL_SPC_UNSPECIFIED;
}
static enum AVColorTransferCharacteristic v4l2_get_color_trc(V4L2Buffer *buf)
{
enum v4l2_ycbcr_encoding ycbcr;
enum v4l2_xfer_func xfer;
enum v4l2_colorspace cs;
cs = V4L2_TYPE_IS_MULTIPLANAR(buf->buf.type) ?
buf->context->format.fmt.pix_mp.colorspace :
buf->context->format.fmt.pix.colorspace;
ycbcr = V4L2_TYPE_IS_MULTIPLANAR(buf->buf.type) ?
buf->context->format.fmt.pix_mp.ycbcr_enc:
buf->context->format.fmt.pix.ycbcr_enc;
xfer = V4L2_TYPE_IS_MULTIPLANAR(buf->buf.type) ?
buf->context->format.fmt.pix_mp.xfer_func:
buf->context->format.fmt.pix.xfer_func;
switch (xfer) {
case V4L2_XFER_FUNC_709: return AVCOL_TRC_BT709;
case V4L2_XFER_FUNC_SRGB: return AVCOL_TRC_IEC61966_2_1;
default:
break;
}
switch (cs) {
case V4L2_COLORSPACE_470_SYSTEM_M: return AVCOL_TRC_GAMMA22;
case V4L2_COLORSPACE_470_SYSTEM_BG: return AVCOL_TRC_GAMMA28;
case V4L2_COLORSPACE_SMPTE170M: return AVCOL_TRC_SMPTE170M;
case V4L2_COLORSPACE_SMPTE240M: return AVCOL_TRC_SMPTE240M;
default:
break;
}
switch (ycbcr) {
case V4L2_YCBCR_ENC_XV709:
case V4L2_YCBCR_ENC_XV601: return AVCOL_TRC_BT1361_ECG;
default:
break;
}
return AVCOL_TRC_UNSPECIFIED;
}
static void v4l2_free_buffer(void *opaque, uint8_t *unused)
{
V4L2Buffer* avbuf = opaque;
V4L2m2mContext *s = buf_to_m2mctx(avbuf);
atomic_fetch_sub_explicit(&s->refcount, 1, memory_order_acq_rel);
if (s->reinit) {
if (!atomic_load(&s->refcount))
sem_post(&s->refsync);
return;
}
if (avbuf->context->streamon) {
ff_v4l2_buffer_enqueue(avbuf);
return;
}
if (!atomic_load(&s->refcount))
ff_v4l2_m2m_codec_end(s->avctx);
}
static int v4l2_buf_to_bufref(V4L2Buffer *in, int plane, AVBufferRef **buf)
{
V4L2m2mContext *s = buf_to_m2mctx(in);
if (plane >= in->num_planes)
return AVERROR(EINVAL);
/* even though most encoders return 0 in data_offset encoding vp8 does require this value */
*buf = av_buffer_create((char *)in->plane_info[plane].mm_addr + in->planes[plane].data_offset,
in->plane_info[plane].length, v4l2_free_buffer, in, 0);
if (!*buf)
return AVERROR(ENOMEM);
in->status = V4L2BUF_RET_USER;
atomic_fetch_add_explicit(&s->refcount, 1, memory_order_relaxed);
return 0;
}
static int v4l2_bufref_to_buf(V4L2Buffer *out, int plane, const uint8_t* data, int size, AVBufferRef* bref)
{
if (plane >= out->num_planes)
return AVERROR(EINVAL);
memcpy(out->plane_info[plane].mm_addr, data, FFMIN(size, out->plane_info[plane].length));
out->planes[plane].bytesused = FFMIN(size, out->plane_info[plane].length);
out->planes[plane].length = out->plane_info[plane].length;
return 0;
}
/******************************************************************************
*
* V4L2uffer interface
*
******************************************************************************/
int ff_v4l2_buffer_avframe_to_buf(const AVFrame *frame, V4L2Buffer* out)
{
int i, ret;
for(i = 0; i < out->num_planes; i++) {
ret = v4l2_bufref_to_buf(out, i, frame->buf[i]->data, frame->buf[i]->size, frame->buf[i]);
if (ret)
return ret;
}
v4l2_set_pts(out, frame->pts);
return 0;
}
int ff_v4l2_buffer_buf_to_avframe(AVFrame *frame, V4L2Buffer *avbuf)
{
V4L2m2mContext *s = buf_to_m2mctx(avbuf);
int i, ret;
av_frame_unref(frame);
/* 1. get references to the actual data */
for (i = 0; i < avbuf->num_planes; i++) {
ret = v4l2_buf_to_bufref(avbuf, i, &frame->buf[i]);
if (ret)
return ret;
frame->linesize[i] = avbuf->plane_info[i].bytesperline;
frame->data[i] = frame->buf[i]->data;
}
/* 1.1 fixup special cases */
switch (avbuf->context->av_pix_fmt) {
case AV_PIX_FMT_NV12:
if (avbuf->num_planes > 1)
break;
frame->linesize[1] = avbuf->plane_info[0].bytesperline;
frame->data[1] = frame->buf[0]->data + avbuf->plane_info[0].bytesperline * avbuf->context->format.fmt.pix_mp.height;
break;
default:
break;
}
/* 2. get frame information */
frame->key_frame = !!(avbuf->buf.flags & V4L2_BUF_FLAG_KEYFRAME);
frame->format = avbuf->context->av_pix_fmt;
frame->color_primaries = v4l2_get_color_primaries(avbuf);
frame->colorspace = v4l2_get_color_space(avbuf);
frame->color_range = v4l2_get_color_range(avbuf);
frame->color_trc = v4l2_get_color_trc(avbuf);
frame->pts = v4l2_get_pts(avbuf);
/* these two values are updated also during re-init in v4l2_process_driver_event */
frame->height = s->output.height;
frame->width = s->output.width;
/* 3. report errors upstream */
if (avbuf->buf.flags & V4L2_BUF_FLAG_ERROR) {
av_log(logger(avbuf), AV_LOG_ERROR, "%s: driver decode error\n", avbuf->context->name);
frame->decode_error_flags |= FF_DECODE_ERROR_INVALID_BITSTREAM;
}
return 0;
}
int ff_v4l2_buffer_buf_to_avpkt(AVPacket *pkt, V4L2Buffer *avbuf)
{
int ret;
av_packet_unref(pkt);
ret = v4l2_buf_to_bufref(avbuf, 0, &pkt->buf);
if (ret)
return ret;
pkt->size = V4L2_TYPE_IS_MULTIPLANAR(avbuf->buf.type) ? avbuf->buf.m.planes[0].bytesused : avbuf->buf.bytesused;
pkt->data = pkt->buf->data;
if (avbuf->buf.flags & V4L2_BUF_FLAG_KEYFRAME)
pkt->flags |= AV_PKT_FLAG_KEY;
if (avbuf->buf.flags & V4L2_BUF_FLAG_ERROR) {
av_log(logger(avbuf), AV_LOG_ERROR, "%s driver encode error\n", avbuf->context->name);
pkt->flags |= AV_PKT_FLAG_CORRUPT;
}
pkt->dts = pkt->pts = v4l2_get_pts(avbuf);
return 0;
}
int ff_v4l2_buffer_avpkt_to_buf(const AVPacket *pkt, V4L2Buffer *out)
{
int ret;
ret = v4l2_bufref_to_buf(out, 0, pkt->data, pkt->size, pkt->buf);
if (ret)
return ret;
v4l2_set_pts(out, pkt->pts);
if (pkt->flags & AV_PKT_FLAG_KEY)
out->flags = V4L2_BUF_FLAG_KEYFRAME;
return 0;
}
int ff_v4l2_buffer_initialize(V4L2Buffer* avbuf, int index)
{
V4L2Context *ctx = avbuf->context;
int ret, i;
avbuf->buf.memory = V4L2_MEMORY_MMAP;
avbuf->buf.type = ctx->type;
avbuf->buf.index = index;
if (V4L2_TYPE_IS_MULTIPLANAR(ctx->type)) {
avbuf->buf.length = VIDEO_MAX_PLANES;
avbuf->buf.m.planes = avbuf->planes;
}
ret = ioctl(buf_to_m2mctx(avbuf)->fd, VIDIOC_QUERYBUF, &avbuf->buf);
if (ret < 0)
return AVERROR(errno);
if (V4L2_TYPE_IS_MULTIPLANAR(ctx->type)) {
avbuf->num_planes = 0;
for (;;) {
/* in MP, the V4L2 API states that buf.length means num_planes */
if (avbuf->num_planes >= avbuf->buf.length)
break;
if (avbuf->buf.m.planes[avbuf->num_planes].length)
avbuf->num_planes++;
}
} else
avbuf->num_planes = 1;
for (i = 0; i < avbuf->num_planes; i++) {
avbuf->plane_info[i].bytesperline = V4L2_TYPE_IS_MULTIPLANAR(ctx->type) ?
ctx->format.fmt.pix_mp.plane_fmt[i].bytesperline :
ctx->format.fmt.pix.bytesperline;
if (V4L2_TYPE_IS_MULTIPLANAR(ctx->type)) {
avbuf->plane_info[i].length = avbuf->buf.m.planes[i].length;
avbuf->plane_info[i].mm_addr = mmap(NULL, avbuf->buf.m.planes[i].length,
PROT_READ | PROT_WRITE, MAP_SHARED,
buf_to_m2mctx(avbuf)->fd, avbuf->buf.m.planes[i].m.mem_offset);
} else {
avbuf->plane_info[i].length = avbuf->buf.length;
avbuf->plane_info[i].mm_addr = mmap(NULL, avbuf->buf.length,
PROT_READ | PROT_WRITE, MAP_SHARED,
buf_to_m2mctx(avbuf)->fd, avbuf->buf.m.offset);
}
if (avbuf->plane_info[i].mm_addr == MAP_FAILED)
return AVERROR(ENOMEM);
}
avbuf->status = V4L2BUF_AVAILABLE;
if (V4L2_TYPE_IS_OUTPUT(ctx->type))
return 0;
if (V4L2_TYPE_IS_MULTIPLANAR(ctx->type)) {
avbuf->buf.m.planes = avbuf->planes;
avbuf->buf.length = avbuf->num_planes;
} else {
avbuf->buf.bytesused = avbuf->planes[0].bytesused;
avbuf->buf.length = avbuf->planes[0].length;
}
return ff_v4l2_buffer_enqueue(avbuf);
}
int ff_v4l2_buffer_enqueue(V4L2Buffer* avbuf)
{
int ret;
avbuf->buf.flags = avbuf->flags;
ret = ioctl(buf_to_m2mctx(avbuf)->fd, VIDIOC_QBUF, &avbuf->buf);
if (ret < 0)
return AVERROR(errno);
avbuf->status = V4L2BUF_IN_DRIVER;
return 0;
}

121
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/*
* V4L2 buffer helper functions.
*
* Copyright (C) 2017 Alexis Ballier <aballier@gentoo.org>
* Copyright (C) 2017 Jorge Ramirez <jorge.ramirez-ortiz@linaro.org>
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef AVCODEC_V4L2_BUFFERS_H
#define AVCODEC_V4L2_BUFFERS_H
enum V4L2Buffer_status {
V4L2BUF_AVAILABLE,
V4L2BUF_IN_DRIVER,
V4L2BUF_RET_USER,
};
/**
* V4L2Buffer (wrapper for v4l2_buffer management)
*/
typedef struct V4L2Buffer {
/* each buffer needs to have a reference to its context */
struct V4L2Context *context;
/* keep track of the mmap address and mmap length */
struct V4L2Plane_info {
int bytesperline;
void * mm_addr;
size_t length;
} plane_info[VIDEO_MAX_PLANES];
int num_planes;
/* the v4l2_buffer buf.m.planes pointer uses the planes[] mem */
struct v4l2_buffer buf;
struct v4l2_plane planes[VIDEO_MAX_PLANES];
int flags;
enum V4L2Buffer_status status;
} V4L2Buffer;
/**
* Extracts the data from a V4L2Buffer to an AVFrame
*
* @param[in] frame The AVFRame to push the information to
* @param[in] buf The V4L2Buffer to get the information from
*
* @returns 0 in case of success, EINVAL if the number of planes is incorrect,
* ENOMEM if the AVBufferRef cant be created.
*/
int ff_v4l2_buffer_buf_to_avframe(AVFrame *frame, V4L2Buffer *buf);
/**
* Extracts the data from a V4L2Buffer to an AVPacket
*
* @param[in] pkt The AVPacket to push the information to
* @param[in] buf The V4L2Buffer to get the information from
*
* @returns 0 in case of success, EINVAL if the number of planes is incorrect,
* ENOMEM if the AVBufferRef cant be created.
*
*/
int ff_v4l2_buffer_buf_to_avpkt(AVPacket *pkt, V4L2Buffer *buf);
/**
* Extracts the data from an AVPacket to a V4L2Buffer
*
* @param[in] frame AVPacket to get the data from
* @param[in] avbuf V4L2Bfuffer to push the information to
*
* @returns 0 in case of success, negative otherwise
*/
int ff_v4l2_buffer_avpkt_to_buf(const AVPacket *pkt, V4L2Buffer *out);
/**
* Extracts the data from an AVFrame to a V4L2Buffer
*
* @param[in] frame AVFrame to get the data from
* @param[in] avbuf V4L2Bfuffer to push the information to
*
* @returns 0 in case of success, negative otherwise
*/
int ff_v4l2_buffer_avframe_to_buf(const AVFrame *frame, V4L2Buffer* out);
/**
* Initializes a V4L2Buffer
*
* @param[in] avbuf V4L2Bfuffer to initialize
* @param[in] index v4l2 buffer id
*
* @returns 0 in case of success, negative otherwise
*/
int ff_v4l2_buffer_initialize(V4L2Buffer* avbuf, int index);
/**
* Enqueues a V4L2Buffer
*
* @param[in] avbuf V4L2Bfuffer to push to the driver
*
* @returns 0 in case of success, negative otherwise
*/
int ff_v4l2_buffer_enqueue(V4L2Buffer* avbuf);
#endif // AVCODEC_V4L2_BUFFERS_H

667
libavcodec/v4l2_context.c Normal file
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/*
* V4L2 context helper functions.
*
* Copyright (C) 2017 Alexis Ballier <aballier@gentoo.org>
* Copyright (C) 2017 Jorge Ramirez <jorge.ramirez-ortiz@linaro.org>
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <linux/videodev2.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <unistd.h>
#include <fcntl.h>
#include <poll.h>
#include "libavcodec/avcodec.h"
#include "libavcodec/internal.h"
#include "v4l2_buffers.h"
#include "v4l2_fmt.h"
#include "v4l2_m2m.h"
struct v4l2_format_update {
uint32_t v4l2_fmt;
int update_v4l2;
enum AVPixelFormat av_fmt;
int update_avfmt;
};
static inline V4L2m2mContext *ctx_to_m2mctx(V4L2Context *ctx)
{
return V4L2_TYPE_IS_OUTPUT(ctx->type) ?
container_of(ctx, V4L2m2mContext, output) :
container_of(ctx, V4L2m2mContext, capture);
}
static inline AVCodecContext *logger(V4L2Context *ctx)
{
return ctx_to_m2mctx(ctx)->avctx;
}
static inline unsigned int v4l2_get_width(struct v4l2_format *fmt)
{
return V4L2_TYPE_IS_MULTIPLANAR(fmt->type) ? fmt->fmt.pix_mp.width : fmt->fmt.pix.width;
}
static inline unsigned int v4l2_get_height(struct v4l2_format *fmt)
{
return V4L2_TYPE_IS_MULTIPLANAR(fmt->type) ? fmt->fmt.pix_mp.height : fmt->fmt.pix.height;
}
static inline unsigned int v4l2_resolution_changed(V4L2Context *ctx, struct v4l2_format *fmt2)
{
struct v4l2_format *fmt1 = &ctx->format;
int ret = V4L2_TYPE_IS_MULTIPLANAR(ctx->type) ?
fmt1->fmt.pix_mp.width != fmt2->fmt.pix_mp.width ||
fmt1->fmt.pix_mp.height != fmt2->fmt.pix_mp.height
:
fmt1->fmt.pix.width != fmt2->fmt.pix.width ||
fmt1->fmt.pix.height != fmt2->fmt.pix.height;
if (ret)
av_log(logger(ctx), AV_LOG_DEBUG, "%s changed (%dx%d) -> (%dx%d)\n",
ctx->name,
v4l2_get_width(fmt1), v4l2_get_height(fmt1),
v4l2_get_width(fmt2), v4l2_get_height(fmt2));
return ret;
}
static inline int v4l2_type_supported(V4L2Context *ctx)
{
return ctx->type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE ||
ctx->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE ||
ctx->type == V4L2_BUF_TYPE_VIDEO_CAPTURE ||
ctx->type == V4L2_BUF_TYPE_VIDEO_OUTPUT;
}
static inline void v4l2_save_to_context(V4L2Context* ctx, struct v4l2_format_update *fmt)
{
ctx->format.type = ctx->type;
if (fmt->update_avfmt)
ctx->av_pix_fmt = fmt->av_fmt;
if (V4L2_TYPE_IS_MULTIPLANAR(ctx->type)) {
/* update the sizes to handle the reconfiguration of the capture stream at runtime */
ctx->format.fmt.pix_mp.height = ctx->height;
ctx->format.fmt.pix_mp.width = ctx->width;
if (fmt->update_v4l2)
ctx->format.fmt.pix_mp.pixelformat = fmt->v4l2_fmt;
} else {
ctx->format.fmt.pix.height = ctx->height;
ctx->format.fmt.pix.width = ctx->width;
if (fmt->update_v4l2)
ctx->format.fmt.pix.pixelformat = fmt->v4l2_fmt;
}
}
/**
* returns 1 if reinit was succesful, negative if it failed
* returns 0 if reinit was not executed
*/
static int v4l2_handle_event(V4L2Context *ctx)
{
V4L2m2mContext *s = ctx_to_m2mctx(ctx);
struct v4l2_format cap_fmt = s->capture.format;
struct v4l2_format out_fmt = s->output.format;
struct v4l2_event evt = { 0 };
int full_reinit, reinit, ret;
ret = ioctl(s->fd, VIDIOC_DQEVENT, &evt);
if (ret < 0) {
av_log(logger(ctx), AV_LOG_ERROR, "%s VIDIOC_DQEVENT\n", ctx->name);
return 0;
}
if (evt.type != V4L2_EVENT_SOURCE_CHANGE)
return 0;
ret = ioctl(s->fd, VIDIOC_G_FMT, &out_fmt);
if (ret) {
av_log(logger(ctx), AV_LOG_ERROR, "%s VIDIOC_G_FMT\n", s->output.name);
return 0;
}
ret = ioctl(s->fd, VIDIOC_G_FMT, &cap_fmt);
if (ret) {
av_log(logger(ctx), AV_LOG_ERROR, "%s VIDIOC_G_FMT\n", s->capture.name);
return 0;
}
full_reinit = v4l2_resolution_changed(&s->output, &out_fmt);
if (full_reinit) {
s->output.height = v4l2_get_height(&out_fmt);
s->output.width = v4l2_get_width(&out_fmt);
}
reinit = v4l2_resolution_changed(&s->capture, &cap_fmt);
if (reinit) {
s->capture.height = v4l2_get_height(&cap_fmt);
s->capture.width = v4l2_get_width(&cap_fmt);
}
if (full_reinit || reinit)
s->reinit = 1;
if (full_reinit) {
ret = ff_v4l2_m2m_codec_full_reinit(s);
if (ret) {
av_log(logger(ctx), AV_LOG_ERROR, "v4l2_m2m_codec_full_reinit\n");
return -EINVAL;
}
goto reinit_run;
}
if (reinit) {
ret = ff_set_dimensions(s->avctx, s->capture.width, s->capture.height);
if (ret < 0)
av_log(logger(ctx), AV_LOG_WARNING, "update avcodec height and width\n");
ret = ff_v4l2_m2m_codec_reinit(s);
if (ret) {
av_log(logger(ctx), AV_LOG_ERROR, "v4l2_m2m_codec_reinit\n");
return -EINVAL;
}
goto reinit_run;
}
/* dummy event received */
return 0;
/* reinit executed */
reinit_run:
return 1;
}
static int v4l2_stop_decode(V4L2Context *ctx)
{
struct v4l2_decoder_cmd cmd = {
.cmd = V4L2_DEC_CMD_STOP,
};
int ret;
ret = ioctl(ctx_to_m2mctx(ctx)->fd, VIDIOC_DECODER_CMD, &cmd);
if (ret) {
/* DECODER_CMD is optional */
if (errno == ENOTTY)
return ff_v4l2_context_set_status(ctx, VIDIOC_STREAMOFF);
}
return 0;
}
static int v4l2_stop_encode(V4L2Context *ctx)
{
struct v4l2_encoder_cmd cmd = {
.cmd = V4L2_ENC_CMD_STOP,
};
int ret;
ret = ioctl(ctx_to_m2mctx(ctx)->fd, VIDIOC_ENCODER_CMD, &cmd);
if (ret) {
/* ENCODER_CMD is optional */
if (errno == ENOTTY)
return ff_v4l2_context_set_status(ctx, VIDIOC_STREAMOFF);
}
return 0;
}
static V4L2Buffer* v4l2_dequeue_v4l2buf(V4L2Context *ctx, int timeout)
{
struct v4l2_plane planes[VIDEO_MAX_PLANES];
struct v4l2_buffer buf = { 0 };
V4L2Buffer* avbuf = NULL;
struct pollfd pfd = {
.events = POLLIN | POLLRDNORM | POLLPRI | POLLOUT | POLLWRNORM, /* default blocking capture */
.fd = ctx_to_m2mctx(ctx)->fd,
};
int ret;
if (V4L2_TYPE_IS_OUTPUT(ctx->type))
pfd.events = POLLOUT | POLLWRNORM;
for (;;) {
ret = poll(&pfd, 1, timeout);
if (ret > 0)
break;
if (errno == EINTR)
continue;
/* timeout is being used to indicate last valid bufer when draining */
if (ctx_to_m2mctx(ctx)->draining)
ctx->done = 1;
return NULL;
}
/* 0. handle errors */
if (pfd.revents & POLLERR) {
av_log(logger(ctx), AV_LOG_WARNING, "%s POLLERR\n", ctx->name);
return NULL;
}
/* 1. handle resolution changes */
if (pfd.revents & POLLPRI) {
ret = v4l2_handle_event(ctx);
if (ret < 0) {
/* if re-init failed, abort */
ctx->done = EINVAL;
return NULL;
}
if (ret) {
/* if re-init was successfull drop the buffer (if there was one)
* since we had to reconfigure capture (unmap all buffers)
*/
return NULL;
}
}
/* 2. dequeue the buffer */
if (pfd.revents & (POLLIN | POLLRDNORM | POLLOUT | POLLWRNORM)) {
if (!V4L2_TYPE_IS_OUTPUT(ctx->type)) {
/* there is a capture buffer ready */
if (pfd.revents & (POLLIN | POLLRDNORM))
goto dequeue;
/* the driver is ready to accept more input; instead of waiting for the capture
* buffer to complete we return NULL so input can proceed (we are single threaded)
*/
if (pfd.revents & (POLLOUT | POLLWRNORM))
return NULL;
}
dequeue:
memset(&buf, 0, sizeof(buf));
buf.memory = V4L2_MEMORY_MMAP;
buf.type = ctx->type;
if (V4L2_TYPE_IS_MULTIPLANAR(ctx->type)) {
memset(planes, 0, sizeof(planes));
buf.length = VIDEO_MAX_PLANES;
buf.m.planes = planes;
}
ret = ioctl(ctx_to_m2mctx(ctx)->fd, VIDIOC_DQBUF, &buf);
if (ret) {
if (errno != EAGAIN) {
ctx->done = errno;
if (errno != EPIPE)
av_log(logger(ctx), AV_LOG_DEBUG, "%s VIDIOC_DQBUF, errno (%s)\n",
ctx->name, av_err2str(AVERROR(errno)));
}
} else {
avbuf = &ctx->buffers[buf.index];
avbuf->status = V4L2BUF_AVAILABLE;
avbuf->buf = buf;
if (V4L2_TYPE_IS_MULTIPLANAR(ctx->type)) {
memcpy(avbuf->planes, planes, sizeof(planes));
avbuf->buf.m.planes = avbuf->planes;
}
}
}
return avbuf;
}
static V4L2Buffer* v4l2_getfree_v4l2buf(V4L2Context *ctx)
{
int timeout = 0; /* return when no more buffers to dequeue */
int i;
/* get back as many output buffers as possible */
if (V4L2_TYPE_IS_OUTPUT(ctx->type)) {
do {
} while (v4l2_dequeue_v4l2buf(ctx, timeout));
}
for (i = 0; i < ctx->num_buffers; i++) {
if (ctx->buffers[i].status == V4L2BUF_AVAILABLE)
return &ctx->buffers[i];
}
return NULL;
}
static int v4l2_release_buffers(V4L2Context* ctx)
{
struct v4l2_requestbuffers req = {
.memory = V4L2_MEMORY_MMAP,
.type = ctx->type,
.count = 0, /* 0 -> unmaps buffers from the driver */
};
int i, j;
for (i = 0; i < ctx->num_buffers; i++) {
V4L2Buffer *buffer = &ctx->buffers[i];
for (j = 0; j < buffer->num_planes; j++) {
struct V4L2Plane_info *p = &buffer->plane_info[j];
if (p->mm_addr && p->length)
if (munmap(p->mm_addr, p->length) < 0)
av_log(logger(ctx), AV_LOG_ERROR, "%s unmap plane (%s))\n", ctx->name, av_err2str(AVERROR(errno)));
}
}
return ioctl(ctx_to_m2mctx(ctx)->fd, VIDIOC_REQBUFS, &req);
}
static inline int v4l2_try_raw_format(V4L2Context* ctx, enum AVPixelFormat pixfmt)
{
struct v4l2_format *fmt = &ctx->format;
uint32_t v4l2_fmt;
int ret;
v4l2_fmt = ff_v4l2_format_avfmt_to_v4l2(pixfmt);
if (!v4l2_fmt)
return AVERROR(EINVAL);
if (V4L2_TYPE_IS_MULTIPLANAR(ctx->type))
fmt->fmt.pix_mp.pixelformat = v4l2_fmt;
else
fmt->fmt.pix.pixelformat = v4l2_fmt;
fmt->type = ctx->type;
ret = ioctl(ctx_to_m2mctx(ctx)->fd, VIDIOC_TRY_FMT, fmt);
if (ret)
return AVERROR(EINVAL);
return 0;
}
static int v4l2_get_raw_format(V4L2Context* ctx, enum AVPixelFormat *p)
{
enum AVPixelFormat pixfmt = ctx->av_pix_fmt;
struct v4l2_fmtdesc fdesc;
int ret;
memset(&fdesc, 0, sizeof(fdesc));
fdesc.type = ctx->type;
if (pixfmt != AV_PIX_FMT_NONE) {
ret = v4l2_try_raw_format(ctx, pixfmt);
if (ret)
pixfmt = AV_PIX_FMT_NONE;
else
return 0;
}
for (;;) {
ret = ioctl(ctx_to_m2mctx(ctx)->fd, VIDIOC_ENUM_FMT, &fdesc);
if (ret)
return AVERROR(EINVAL);
pixfmt = ff_v4l2_format_v4l2_to_avfmt(fdesc.pixelformat, AV_CODEC_ID_RAWVIDEO);
ret = v4l2_try_raw_format(ctx, pixfmt);
if (ret){
fdesc.index++;
continue;
}
*p = pixfmt;
return 0;
}
return AVERROR(EINVAL);
}
static int v4l2_get_coded_format(V4L2Context* ctx, uint32_t *p)
{
struct v4l2_fmtdesc fdesc;
uint32_t v4l2_fmt;
int ret;
/* translate to a valid v4l2 format */
v4l2_fmt = ff_v4l2_format_avcodec_to_v4l2(ctx->av_codec_id);
if (!v4l2_fmt)
return AVERROR(EINVAL);
/* check if the driver supports this format */
memset(&fdesc, 0, sizeof(fdesc));
fdesc.type = ctx->type;
for (;;) {
ret = ioctl(ctx_to_m2mctx(ctx)->fd, VIDIOC_ENUM_FMT, &fdesc);
if (ret)
return AVERROR(EINVAL);
if (fdesc.pixelformat == v4l2_fmt)
break;
fdesc.index++;
}
*p = v4l2_fmt;
return 0;
}
/*****************************************************************************
*
* V4L2 Context Interface
*
*****************************************************************************/
int ff_v4l2_context_set_status(V4L2Context* ctx, int cmd)
{
int type = ctx->type;
int ret;
ret = ioctl(ctx_to_m2mctx(ctx)->fd, cmd, &type);
if (ret < 0)
return AVERROR(errno);
ctx->streamon = (cmd == VIDIOC_STREAMON);
return 0;
}
int ff_v4l2_context_enqueue_frame(V4L2Context* ctx, const AVFrame* frame)
{
V4L2m2mContext *s = ctx_to_m2mctx(ctx);
V4L2Buffer* avbuf;
int ret;
if (!frame) {
ret = v4l2_stop_encode(ctx);
if (ret)
av_log(logger(ctx), AV_LOG_ERROR, "%s stop_encode\n", ctx->name);
s->draining= 1;
return 0;
}
avbuf = v4l2_getfree_v4l2buf(ctx);
if (!avbuf)
return AVERROR(ENOMEM);
ret = ff_v4l2_buffer_avframe_to_buf(frame, avbuf);
if (ret)
return ret;
return ff_v4l2_buffer_enqueue(avbuf);
}
int ff_v4l2_context_enqueue_packet(V4L2Context* ctx, const AVPacket* pkt)
{
V4L2m2mContext *s = ctx_to_m2mctx(ctx);
V4L2Buffer* avbuf;
int ret;
if (!pkt->size) {
ret = v4l2_stop_decode(ctx);
if (ret)
av_log(logger(ctx), AV_LOG_ERROR, "%s stop_decode\n", ctx->name);
s->draining = 1;
return 0;
}
avbuf = v4l2_getfree_v4l2buf(ctx);
if (!avbuf)
return AVERROR(ENOMEM);
ret = ff_v4l2_buffer_avpkt_to_buf(pkt, avbuf);
if (ret)
return ret;
return ff_v4l2_buffer_enqueue(avbuf);
}
int ff_v4l2_context_dequeue_frame(V4L2Context* ctx, AVFrame* frame)
{
V4L2Buffer* avbuf = NULL;
/* if we are draining, we are no longer inputing data, therefore enable a
* timeout so we can dequeue and flag the last valid buffer.
*
* blocks until:
* 1. decoded frame available
* 2. an input buffer is ready to be dequeued
*/
avbuf = v4l2_dequeue_v4l2buf(ctx, ctx_to_m2mctx(ctx)->draining ? 200 : -1);
if (!avbuf) {
if (ctx->done)
return AVERROR_EOF;
return AVERROR(EAGAIN);
}
return ff_v4l2_buffer_buf_to_avframe(frame, avbuf);
}
int ff_v4l2_context_dequeue_packet(V4L2Context* ctx, AVPacket* pkt)
{
V4L2Buffer* avbuf = NULL;
/* if we are draining, we are no longer inputing data, therefore enable a
* timeout so we can dequeue and flag the last valid buffer.
*
* blocks until:
* 1. encoded packet available
* 2. an input buffer ready to be dequeued
*/
avbuf = v4l2_dequeue_v4l2buf(ctx, ctx_to_m2mctx(ctx)->draining ? 200 : -1);
if (!avbuf) {
if (ctx->done)
return AVERROR_EOF;
return AVERROR(EAGAIN);
}
return ff_v4l2_buffer_buf_to_avpkt(pkt, avbuf);
}
int ff_v4l2_context_get_format(V4L2Context* ctx)
{
struct v4l2_format_update fmt = { 0 };
int ret;
if (ctx->av_codec_id == AV_CODEC_ID_RAWVIDEO) {
ret = v4l2_get_raw_format(ctx, &fmt.av_fmt);
if (ret)
return ret;
fmt.update_avfmt = 1;
v4l2_save_to_context(ctx, &fmt);
/* format has been tried already */
return ret;
}
ret = v4l2_get_coded_format(ctx, &fmt.v4l2_fmt);
if (ret)
return ret;
fmt.update_v4l2 = 1;
v4l2_save_to_context(ctx, &fmt);
return ioctl(ctx_to_m2mctx(ctx)->fd, VIDIOC_TRY_FMT, &ctx->format);
}
int ff_v4l2_context_set_format(V4L2Context* ctx)
{
return ioctl(ctx_to_m2mctx(ctx)->fd, VIDIOC_S_FMT, &ctx->format);
}
void ff_v4l2_context_release(V4L2Context* ctx)
{
int ret;
if (!ctx->buffers)
return;
ret = v4l2_release_buffers(ctx);
if (ret)
av_log(logger(ctx), AV_LOG_WARNING, "V4L2 failed to unmap the %s buffers\n", ctx->name);
av_free(ctx->buffers);
ctx->buffers = NULL;
}
int ff_v4l2_context_init(V4L2Context* ctx)
{
V4L2m2mContext *s = ctx_to_m2mctx(ctx);
struct v4l2_requestbuffers req;
int ret, i;
if (!v4l2_type_supported(ctx)) {
av_log(logger(ctx), AV_LOG_ERROR, "type %i not supported\n", ctx->type);
return AVERROR_PATCHWELCOME;
}
ret = ioctl(s->fd, VIDIOC_G_FMT, &ctx->format);
if (ret)
av_log(logger(ctx), AV_LOG_ERROR, "%s VIDIOC_G_FMT failed\n", ctx->name);
memset(&req, 0, sizeof(req));
req.count = ctx->num_buffers;
req.memory = V4L2_MEMORY_MMAP;
req.type = ctx->type;
ret = ioctl(s->fd, VIDIOC_REQBUFS, &req);
if (ret < 0)
return AVERROR(errno);
ctx->num_buffers = req.count;
ctx->buffers = av_mallocz(ctx->num_buffers * sizeof(V4L2Buffer));
if (!ctx->buffers) {
av_log(logger(ctx), AV_LOG_ERROR, "%s malloc enomem\n", ctx->name);
return AVERROR(ENOMEM);
}
for (i = 0; i < req.count; i++) {
ctx->buffers[i].context = ctx;
ret = ff_v4l2_buffer_initialize(&ctx->buffers[i], i);
if (ret < 0) {
av_log(logger(ctx), AV_LOG_ERROR, "%s buffer initialization (%s)\n", ctx->name, av_err2str(ret));
av_free(ctx->buffers);
return ret;
}
}
av_log(logger(ctx), AV_LOG_DEBUG, "%s: %s %02d buffers initialized: %04ux%04u, sizeimage %08u, bytesperline %08u\n", ctx->name,
V4L2_TYPE_IS_MULTIPLANAR(ctx->type) ? av_fourcc2str(ctx->format.fmt.pix_mp.pixelformat) : av_fourcc2str(ctx->format.fmt.pix.pixelformat),
req.count,
v4l2_get_width(&ctx->format),
v4l2_get_height(&ctx->format),
V4L2_TYPE_IS_MULTIPLANAR(ctx->type) ? ctx->format.fmt.pix_mp.plane_fmt[0].sizeimage : ctx->format.fmt.pix.sizeimage,
V4L2_TYPE_IS_MULTIPLANAR(ctx->type) ? ctx->format.fmt.pix_mp.plane_fmt[0].bytesperline : ctx->format.fmt.pix.bytesperline);
return 0;
}

181
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/*
* V4L2 context helper functions.
*
* Copyright (C) 2017 Alexis Ballier <aballier@gentoo.org>
* Copyright (C) 2017 Jorge Ramirez <jorge.ramirez-ortiz@linaro.org>
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef AVCODEC_V4L2_CONTEXT_H
#define AVCODEC_V4L2_CONTEXT_H
#include <stdatomic.h>
#include "libavcodec/avcodec.h"
#include "libavutil/pixfmt.h"
#include "libavutil/frame.h"
#include "libavutil/buffer.h"
#include "v4l2_buffers.h"
typedef struct V4L2Context {
/**
* context name.
*/
const char* name;
/**
* Type of this buffer context.
* See V4L2_BUF_TYPE_VIDEO_* in videodev2.h
* Readonly after init.
*/
enum v4l2_buf_type type;
/**
* AVPixelFormat corresponding to this buffer context.
* AV_PIX_FMT_NONE means this is an encoded stream.
*/
enum AVPixelFormat av_pix_fmt;
/**
* AVCodecID corresponding to this buffer context.
* AV_CODEC_ID_RAWVIDEO means this is a raw stream and av_pix_fmt must be set to a valid value.
*/
enum AVCodecID av_codec_id;
/**
* Format returned by the driver after initializing the buffer context.
* Readonly after init.
*/
struct v4l2_format format;
/**
* Width and height of the frames it produces (in case of a capture context, e.g. when decoding)
* or accepts (in case of an output context, e.g. when encoding).
*/
int width, height;
/**
* Indexed array of V4L2Buffers
*/
V4L2Buffer *buffers;
/**
* Readonly after init.
*/
int num_buffers;
/**
* Whether the stream has been started (VIDIOC_STREAMON has been sent).
*/
int streamon;
/**
* Either no more buffers available or an unrecoverable error was notified
* by the V4L2 kernel driver: once set the context has to be exited.
*/
int done;
} V4L2Context;
/**
* Initializes a V4L2Context.
*
* @param[in] ctx A pointer to a V4L2Context. See V4L2Context description for required variables.
* @return 0 in case of success, a negative value representing the error otherwise.
*/
int ff_v4l2_context_init(V4L2Context* ctx);
/**
* Sets the V4L2Context format in the v4l2 driver.
*
* @param[in] ctx A pointer to a V4L2Context. See V4L2Context description for required variables.
* @return 0 in case of success, a negative value representing the error otherwise.
*/
int ff_v4l2_context_set_format(V4L2Context* ctx);
/**
* Queries the driver for a valid v4l2 format and copies it to the context.
*
* @param[in] ctx A pointer to a V4L2Context. See V4L2Context description for required variables.
* @return 0 in case of success, a negative value representing the error otherwise.
*/
int ff_v4l2_context_get_format(V4L2Context* ctx);
/**
* Releases a V4L2Context.
*
* @param[in] ctx A pointer to a V4L2Context.
* The caller is reponsible for freeing it.
* It must not be used after calling this function.
*/
void ff_v4l2_context_release(V4L2Context* ctx);
/**
* Sets the status of a V4L2Context.
*
* @param[in] ctx A pointer to a V4L2Context.
* @param[in] cmd The status to set (VIDIOC_STREAMON or VIDIOC_STREAMOFF).
* Warning: If VIDIOC_STREAMOFF is sent to a buffer context that still has some frames buffered,
* those frames will be dropped.
* @return 0 in case of success, a negative value representing the error otherwise.
*/
int ff_v4l2_context_set_status(V4L2Context* ctx, int cmd);
/**
* Dequeues a buffer from a V4L2Context to an AVPacket.
*
* The pkt must be non NULL.
* @param[in] ctx The V4L2Context to dequeue from.
* @param[inout] pkt The AVPacket to dequeue to.
* @return 0 in case of success, AVERROR(EAGAIN) if no buffer was ready, another negative error in case of error.
*/
int ff_v4l2_context_dequeue_packet(V4L2Context* ctx, AVPacket* pkt);
/**
* Dequeues a buffer from a V4L2Context to an AVFrame.
*
* The frame must be non NULL.
* @param[in] ctx The V4L2Context to dequeue from.
* @param[inout] f The AVFrame to dequeue to.
* @return 0 in case of success, AVERROR(EAGAIN) if no buffer was ready, another negative error in case of error.
*/
int ff_v4l2_context_dequeue_frame(V4L2Context* ctx, AVFrame* f);
/**
* Enqueues a buffer to a V4L2Context from an AVPacket
*
* The packet must be non NULL.
* When the size of the pkt is null, the buffer is not queued but a V4L2_DEC_CMD_STOP command is sent instead to the driver.
*
* @param[in] ctx The V4L2Context to enqueue to.
* @param[in] pkt A pointer to an AVPacket.
* @return 0 in case of success, a negative error otherwise.
*/
int ff_v4l2_context_enqueue_packet(V4L2Context* ctx, const AVPacket* pkt);
/**
* Enqueues a buffer to a V4L2Context from an AVFrame
*
* The frame must be non NULL.
*
* @param[in] ctx The V4L2Context to enqueue to.
* @param[in] f A pointer to an AVFrame to enqueue.
* @return 0 in case of success, a negative error otherwise.
*/
int ff_v4l2_context_enqueue_frame(V4L2Context* ctx, const AVFrame* f);
#endif // AVCODEC_V4L2_CONTEXT_H

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/*
* V4L2 format helper functions
*
* Copyright (C) 2017 Alexis Ballier <aballier@gentoo.org>
* Copyright (C) 2017 Jorge Ramirez <jorge.ramirez-ortiz@linaro.org>
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <linux/videodev2.h>
#include <search.h>
#include "v4l2_fmt.h"
#define V4L2_FMT(x) V4L2_PIX_FMT_##x
#define AV_CODEC(x) AV_CODEC_ID_##x
#define AV_FMT(x) AV_PIX_FMT_##x
static const struct fmt_conversion {
enum AVPixelFormat avfmt;
enum AVCodecID avcodec;
uint32_t v4l2_fmt;
} fmt_map[] = {
{ AV_FMT(RGB555LE), AV_CODEC(RAWVIDEO), V4L2_FMT(RGB555) },
{ AV_FMT(RGB555BE), AV_CODEC(RAWVIDEO), V4L2_FMT(RGB555X) },
{ AV_FMT(RGB565LE), AV_CODEC(RAWVIDEO), V4L2_FMT(RGB565) },
{ AV_FMT(RGB565BE), AV_CODEC(RAWVIDEO), V4L2_FMT(RGB565X) },
{ AV_FMT(BGR24), AV_CODEC(RAWVIDEO), V4L2_FMT(BGR24) },
{ AV_FMT(RGB24), AV_CODEC(RAWVIDEO), V4L2_FMT(RGB24) },
{ AV_FMT(BGR0), AV_CODEC(RAWVIDEO), V4L2_FMT(BGR32) },
{ AV_FMT(0RGB), AV_CODEC(RAWVIDEO), V4L2_FMT(RGB32) },
{ AV_FMT(GRAY8), AV_CODEC(RAWVIDEO), V4L2_FMT(GREY) },
{ AV_FMT(YUV420P), AV_CODEC(RAWVIDEO), V4L2_FMT(YUV420) },
{ AV_FMT(YUYV422), AV_CODEC(RAWVIDEO), V4L2_FMT(YUYV) },
{ AV_FMT(UYVY422), AV_CODEC(RAWVIDEO), V4L2_FMT(UYVY) },
{ AV_FMT(YUV422P), AV_CODEC(RAWVIDEO), V4L2_FMT(YUV422P) },
{ AV_FMT(YUV411P), AV_CODEC(RAWVIDEO), V4L2_FMT(YUV411P) },
{ AV_FMT(YUV410P), AV_CODEC(RAWVIDEO), V4L2_FMT(YUV410) },
{ AV_FMT(YUV410P), AV_CODEC(RAWVIDEO), V4L2_FMT(YVU410) },
{ AV_FMT(NV12), AV_CODEC(RAWVIDEO), V4L2_FMT(NV12) },
{ AV_FMT(NONE), AV_CODEC(MJPEG), V4L2_FMT(MJPEG) },
{ AV_FMT(NONE), AV_CODEC(MJPEG), V4L2_FMT(JPEG) },
#ifdef V4L2_PIX_FMT_SRGGB8
{ AV_FMT(BAYER_BGGR8), AV_CODEC(RAWVIDEO), V4L2_FMT(SBGGR8) },
{ AV_FMT(BAYER_GBRG8), AV_CODEC(RAWVIDEO), V4L2_FMT(SGBRG8) },
{ AV_FMT(BAYER_GRBG8), AV_CODEC(RAWVIDEO), V4L2_FMT(SGRBG8) },
{ AV_FMT(BAYER_RGGB8), AV_CODEC(RAWVIDEO), V4L2_FMT(SRGGB8) },
#endif
#ifdef V4L2_PIX_FMT_Y16
{ AV_FMT(GRAY16LE), AV_CODEC(RAWVIDEO), V4L2_FMT(Y16) },
#endif
#ifdef V4L2_PIX_FMT_NV12M
{ AV_FMT(NV12), AV_CODEC(RAWVIDEO), V4L2_FMT(NV12M) },
#endif
#ifdef V4L2_PIX_FMT_NV21M
{ AV_FMT(NV21), AV_CODEC(RAWVIDEO), V4L2_FMT(NV21M) },
#endif
#ifdef V4L2_PIX_FMT_YUV420M
{ AV_FMT(YUV420P), AV_CODEC(RAWVIDEO), V4L2_FMT(YUV420M) },
#endif
#ifdef V4L2_PIX_FMT_NV16M
{ AV_FMT(NV16), AV_CODEC(RAWVIDEO), V4L2_FMT(NV16M) },
#endif
#ifdef V4L2_PIX_FMT_H263
{ AV_FMT(NONE), AV_CODEC(H263), V4L2_FMT(H263) },
#endif
#ifdef V4L2_PIX_FMT_H264
{ AV_FMT(NONE), AV_CODEC(H264), V4L2_FMT(H264) },
#endif
#ifdef V4L2_PIX_FMT_MPEG4
{ AV_FMT(NONE), AV_CODEC(MPEG4), V4L2_FMT(MPEG4) },
#endif
#ifdef V4L2_PIX_FMT_CPIA1
{ AV_FMT(NONE), AV_CODEC(CPIA), V4L2_FMT(CPIA1) },
#endif
#ifdef V4L2_PIX_FMT_DV
{ AV_FMT(NONE), AV_CODEC(DVVIDEO), V4L2_FMT(DV) },
#endif
#ifdef V4L2_PIX_FMT_MPEG1
{ AV_FMT(NONE), AV_CODEC(MPEG1VIDEO), V4L2_FMT(MPEG1) },
#endif
#ifdef V4L2_PIX_FMT_MPEG2
{ AV_FMT(NONE), AV_CODEC(MPEG2VIDEO), V4L2_FMT(MPEG2) },
#endif
#ifdef V4L2_PIX_FMT_VP8
{ AV_FMT(NONE), AV_CODEC(VP8), V4L2_FMT(VP8) },
#endif
#ifdef V4L2_PIX_FMT_VP9
{ AV_FMT(NONE), AV_CODEC(VP9), V4L2_FMT(VP9) },
#endif
#ifdef V4L2_PIX_FMT_HEVC
{ AV_FMT(NONE), AV_CODEC(HEVC), V4L2_FMT(HEVC) },
#endif
#ifdef V4L2_PIX_FMT_VC1_ANNEX_G
{ AV_FMT(NONE), AV_CODEC(VC1), V4L2_FMT(VC1_ANNEX_G) },
#endif
};
static int match_codec(const void *a, const void *b)
{
if (*(enum AVCodecID *)a == ((struct fmt_conversion *)b)->avcodec)
return 0;
return 1;
}
uint32_t ff_v4l2_format_avcodec_to_v4l2(enum AVCodecID avcodec)
{
size_t len = FF_ARRAY_ELEMS(fmt_map);
struct fmt_conversion *item;
item = lfind(&avcodec, fmt_map, &len, sizeof(fmt_map[0]), match_codec);
if (item)
return item->v4l2_fmt;
return 0;
}
static int match_fmt(const void *a, const void *b)
{
if ( *(enum AVPixelFormat *)a == ((struct fmt_conversion *)b)->avfmt)
return 0;
return 1;
}
uint32_t ff_v4l2_format_avfmt_to_v4l2(enum AVPixelFormat avfmt)
{
size_t len = FF_ARRAY_ELEMS(fmt_map);
struct fmt_conversion *item;
item = lfind(&avfmt, fmt_map, &len, sizeof(fmt_map[0]), match_fmt);
if (item)
return item->v4l2_fmt;
return 0;
}
struct v4l2fmt_avcodec_pair {
enum AVCodecID avcodec;
uint32_t v4l2_fmt;
};
static int match_codecfmt(const void *a, const void *b)
{
struct v4l2fmt_avcodec_pair *key = (struct v4l2fmt_avcodec_pair *) a;
struct fmt_conversion *item = (struct fmt_conversion *) b;
if (key->avcodec == item->avcodec && key->v4l2_fmt == item->v4l2_fmt)
return 0;
return 1;
}
enum AVPixelFormat ff_v4l2_format_v4l2_to_avfmt(uint32_t v4l2_fmt, enum AVCodecID avcodec)
{
struct v4l2fmt_avcodec_pair const key = {
.v4l2_fmt = v4l2_fmt,
.avcodec = avcodec,
};
size_t len = FF_ARRAY_ELEMS(fmt_map);
struct fmt_conversion *item;
item = lfind(&key, fmt_map, &len, sizeof(fmt_map[0]), match_codecfmt);
if (item)
return item->avfmt;
return AV_PIX_FMT_NONE;
}

34
libavcodec/v4l2_fmt.h Normal file
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/*
* V4L2 format helper functions
*
* Copyright (C) 2017 Alexis Ballier <aballier@gentoo.org>
* Copyright (C) 2017 Jorge Ramirez <jorge.ramirez-ortiz@linaro.org>
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef AVCODEC_V4L2_FMT_H
#define AVCODEC_V4L2_FMT_H
#include "libavcodec/avcodec.h"
#include "libavutil/pixfmt.h"
enum AVPixelFormat ff_v4l2_format_v4l2_to_avfmt(uint32_t v4l2_fmt, enum AVCodecID avcodec);
uint32_t ff_v4l2_format_avcodec_to_v4l2(enum AVCodecID avcodec);
uint32_t ff_v4l2_format_avfmt_to_v4l2(enum AVPixelFormat avfmt);
#endif /* AVCODEC_V4L2_FMT_H*/

383
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/*
* V4L mem2mem
*
* Copyright (C) 2017 Alexis Ballier <aballier@gentoo.org>
* Copyright (C) 2017 Jorge Ramirez <jorge.ramirez-ortiz@linaro.org>
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <linux/videodev2.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <unistd.h>
#include <dirent.h>
#include <fcntl.h>
#include "libavcodec/avcodec.h"
#include "libavcodec/internal.h"
#include "libavutil/pixdesc.h"
#include "libavutil/imgutils.h"
#include "libavutil/pixfmt.h"
#include "v4l2_context.h"
#include "v4l2_fmt.h"
#include "v4l2_m2m.h"
static inline int v4l2_splane_video(struct v4l2_capability *cap)
{
if (cap->capabilities & (V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_VIDEO_OUTPUT) &&
cap->capabilities & V4L2_CAP_STREAMING)
return 1;
if (cap->capabilities & V4L2_CAP_VIDEO_M2M)
return 1;
return 0;
}
static inline int v4l2_mplane_video(struct v4l2_capability *cap)
{
if (cap->capabilities & (V4L2_CAP_VIDEO_CAPTURE_MPLANE | V4L2_CAP_VIDEO_OUTPUT_MPLANE) &&
cap->capabilities & V4L2_CAP_STREAMING)
return 1;
if (cap->capabilities & V4L2_CAP_VIDEO_M2M_MPLANE)
return 1;
return 0;
}
static int v4l2_prepare_contexts(V4L2m2mContext* s)
{
struct v4l2_capability cap;
int ret;
s->capture.done = s->output.done = 0;
s->capture.name = "capture";
s->output.name = "output ";
atomic_init(&s->refcount, 0);
sem_init(&s->refsync, 0, 0);
memset(&cap, 0, sizeof(cap));
ret = ioctl(s->fd, VIDIOC_QUERYCAP, &cap);
if (ret < 0)
return ret;
av_log(s->avctx, AV_LOG_INFO, "driver '%s' on card '%s'\n", cap.driver, cap.card);
if (v4l2_mplane_video(&cap)) {
s->capture.type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;
s->output.type = V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE;
return 0;
}
if (v4l2_splane_video(&cap)) {
s->capture.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
s->output.type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
return 0;
}
return AVERROR(EINVAL);
}
static int v4l2_probe_driver(V4L2m2mContext* s)
{
int ret;
s->fd = open(s->devname, O_RDWR | O_NONBLOCK, 0);
if (s->fd < 0)
return AVERROR(errno);
ret = v4l2_prepare_contexts(s);
if (ret < 0)
goto done;
ret = ff_v4l2_context_get_format(&s->output);
if (ret) {
av_log(s->avctx, AV_LOG_DEBUG, "v4l2 output format not supported\n");
goto done;
}
ret = ff_v4l2_context_get_format(&s->capture);
if (ret) {
av_log(s->avctx, AV_LOG_DEBUG, "v4l2 capture format not supported\n");
goto done;
}
done:
if (close(s->fd) < 0) {
ret = AVERROR(errno);
av_log(s->avctx, AV_LOG_ERROR, "failure closing %s (%s)\n", s->devname, av_err2str(AVERROR(errno)));
}
s->fd = -1;
return ret;
}
static int v4l2_configure_contexts(V4L2m2mContext* s)
{
void *log_ctx = s->avctx;
int ret;
s->fd = open(s->devname, O_RDWR | O_NONBLOCK, 0);
if (s->fd < 0)
return AVERROR(errno);
ret = v4l2_prepare_contexts(s);
if (ret < 0)
goto error;
ret = ff_v4l2_context_set_format(&s->output);
if (ret) {
av_log(log_ctx, AV_LOG_ERROR, "can't set v4l2 output format\n");
goto error;
}
ret = ff_v4l2_context_set_format(&s->capture);
if (ret) {
av_log(log_ctx, AV_LOG_ERROR, "can't to set v4l2 capture format\n");
goto error;
}
ret = ff_v4l2_context_init(&s->output);
if (ret) {
av_log(log_ctx, AV_LOG_ERROR, "no v4l2 output context's buffers\n");
goto error;
}
/* decoder's buffers need to be updated at a later stage */
if (!av_codec_is_decoder(s->avctx->codec)) {
ret = ff_v4l2_context_init(&s->capture);
if (ret) {
av_log(log_ctx, AV_LOG_ERROR, "no v4l2 capture context's buffers\n");
goto error;
}
}
return 0;
error:
if (close(s->fd) < 0) {
ret = AVERROR(errno);
av_log(log_ctx, AV_LOG_ERROR, "error closing %s (%s)\n",
s->devname, av_err2str(AVERROR(errno)));
}
s->fd = -1;
return ret;
}
/******************************************************************************
*
* V4L2 M2M Interface
*
******************************************************************************/
int ff_v4l2_m2m_codec_reinit(V4L2m2mContext* s)
{
int ret;
av_log(s->avctx, AV_LOG_DEBUG, "reinit context\n");
/* 1. streamoff */
ret = ff_v4l2_context_set_status(&s->capture, VIDIOC_STREAMOFF);
if (ret)
av_log(s->avctx, AV_LOG_ERROR, "capture VIDIOC_STREAMOFF\n");
/* 2. unmap the capture buffers (v4l2 and ffmpeg):
* we must wait for all references to be released before being allowed
* to queue new buffers.
*/
av_log(s->avctx, AV_LOG_DEBUG, "waiting for user to release AVBufferRefs\n");
if (atomic_load(&s->refcount))
while(sem_wait(&s->refsync) == -1 && errno == EINTR);
ff_v4l2_context_release(&s->capture);
/* 3. get the new capture format */
ret = ff_v4l2_context_get_format(&s->capture);
if (ret) {
av_log(s->avctx, AV_LOG_ERROR, "query the new capture format\n");
return ret;
}
/* 4. set the capture format */
ret = ff_v4l2_context_set_format(&s->capture);
if (ret) {
av_log(s->avctx, AV_LOG_ERROR, "setting capture format\n");
return ret;
}
/* 5. complete reinit */
sem_destroy(&s->refsync);
sem_init(&s->refsync, 0, 0);
s->draining = 0;
s->reinit = 0;
return 0;
}
int ff_v4l2_m2m_codec_full_reinit(V4L2m2mContext *s)
{
void *log_ctx = s->avctx;
int ret;
av_log(log_ctx, AV_LOG_DEBUG, "%s full reinit\n", s->devname);
/* wait for pending buffer references */
if (atomic_load(&s->refcount))
while(sem_wait(&s->refsync) == -1 && errno == EINTR);
/* close the driver */
ff_v4l2_m2m_codec_end(s->avctx);
/* start again now that we know the stream dimensions */
s->draining = 0;
s->reinit = 0;
s->fd = open(s->devname, O_RDWR | O_NONBLOCK, 0);
if (s->fd < 0)
return AVERROR(errno);
ret = v4l2_prepare_contexts(s);
if (ret < 0)
goto error;
/* if a full re-init was requested - probe didn't run - we need to populate
* the format for each context
*/
ret = ff_v4l2_context_get_format(&s->output);
if (ret) {
av_log(log_ctx, AV_LOG_DEBUG, "v4l2 output format not supported\n");
goto error;
}
ret = ff_v4l2_context_get_format(&s->capture);
if (ret) {
av_log(log_ctx, AV_LOG_DEBUG, "v4l2 capture format not supported\n");
goto error;
}
ret = ff_v4l2_context_set_format(&s->output);
if (ret) {
av_log(log_ctx, AV_LOG_ERROR, "can't set v4l2 output format\n");
goto error;
}
ret = ff_v4l2_context_set_format(&s->capture);
if (ret) {
av_log(log_ctx, AV_LOG_ERROR, "can't to set v4l2 capture format\n");
goto error;
}
ret = ff_v4l2_context_init(&s->output);
if (ret) {
av_log(log_ctx, AV_LOG_ERROR, "no v4l2 output context's buffers\n");
goto error;
}
/* decoder's buffers need to be updated at a later stage */
if (!av_codec_is_decoder(s->avctx->codec)) {
ret = ff_v4l2_context_init(&s->capture);
if (ret) {
av_log(log_ctx, AV_LOG_ERROR, "no v4l2 capture context's buffers\n");
goto error;
}
}
return 0;
error:
if (close(s->fd) < 0) {
ret = AVERROR(errno);
av_log(log_ctx, AV_LOG_ERROR, "error closing %s (%s)\n",
s->devname, av_err2str(AVERROR(errno)));
}
s->fd = -1;
return ret;
}
int ff_v4l2_m2m_codec_end(AVCodecContext *avctx)
{
V4L2m2mContext* s = avctx->priv_data;
int ret;
ret = ff_v4l2_context_set_status(&s->output, VIDIOC_STREAMOFF);
if (ret)
av_log(avctx, AV_LOG_ERROR, "VIDIOC_STREAMOFF %s\n", s->output.name);
ret = ff_v4l2_context_set_status(&s->capture, VIDIOC_STREAMOFF);
if (ret)
av_log(avctx, AV_LOG_ERROR, "VIDIOC_STREAMOFF %s\n", s->capture.name);
ff_v4l2_context_release(&s->output);
if (atomic_load(&s->refcount))
av_log(avctx, AV_LOG_ERROR, "ff_v4l2m2m_codec_end leaving pending buffers\n");
ff_v4l2_context_release(&s->capture);
sem_destroy(&s->refsync);
/* release the hardware */
if (close(s->fd) < 0 )
av_log(avctx, AV_LOG_ERROR, "failure closing %s (%s)\n", s->devname, av_err2str(AVERROR(errno)));
s->fd = -1;
return 0;
}
int ff_v4l2_m2m_codec_init(AVCodecContext *avctx)
{
int ret = AVERROR(EINVAL);
struct dirent *entry;
char node[PATH_MAX];
DIR *dirp;
V4L2m2mContext *s = avctx->priv_data;
s->avctx = avctx;
dirp = opendir("/dev");
if (!dirp)
return AVERROR(errno);
for (entry = readdir(dirp); entry; entry = readdir(dirp)) {
if (strncmp(entry->d_name, "video", 5))
continue;
snprintf(node, sizeof(node), "/dev/%s", entry->d_name);
av_log(s->avctx, AV_LOG_DEBUG, "probing device %s\n", node);
strncpy(s->devname, node, strlen(node) + 1);
ret = v4l2_probe_driver(s);
if (!ret)
break;
}
closedir(dirp);
if (ret) {
av_log(s->avctx, AV_LOG_ERROR, "Could not find a valid device\n");
memset(s->devname, 0, sizeof(s->devname));
return ret;
}
av_log(s->avctx, AV_LOG_INFO, "Using device %s\n", node);
return v4l2_configure_contexts(s);
}

103
libavcodec/v4l2_m2m.h Normal file
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/*
* V4L2 mem2mem helper functions
*
* Copyright (C) 2017 Alexis Ballier <aballier@gentoo.org>
* Copyright (C) 2017 Jorge Ramirez <jorge.ramirez-ortiz@linaro.org>
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef AVCODEC_V4L2_M2M_H
#define AVCODEC_V4L2_M2M_H
#include <semaphore.h>
#include <unistd.h>
#include <dirent.h>
#include "libavcodec/avcodec.h"
#include "v4l2_context.h"
#define container_of(ptr, type, member) ({ \
const __typeof__(((type *)0)->member ) *__mptr = (ptr); \
(type *)((char *)__mptr - offsetof(type,member) );})
#define V4L_M2M_DEFAULT_OPTS \
{ "num_output_buffers", "Number of buffers in the output context",\
OFFSET(output.num_buffers), AV_OPT_TYPE_INT, { .i64 = 16 }, 6, INT_MAX, FLAGS }
typedef struct V4L2m2mContext
{
AVClass *class;
char devname[PATH_MAX];
int fd;
/* the codec context queues */
V4L2Context capture;
V4L2Context output;
/* refcount of buffers held by the user */
atomic_uint refcount;
/* dynamic stream reconfig */
AVCodecContext *avctx;
sem_t refsync;
int reinit;
/* null frame/packet received */
int draining;
} V4L2m2mContext;
/**
* Probes the video nodes looking for the required codec capabilities.
*
* @param[in] ctx The AVCodecContext instantiated by the encoder/decoder.
*
* @returns 0 if a driver is found, a negative number otherwise.
*/
int ff_v4l2_m2m_codec_init(AVCodecContext *avctx);
/**
* Releases all the codec resources if all AVBufferRefs have been returned to the
* ctx. Otherwise keep the driver open.
*
* @param[in] The AVCodecContext instantiated by the encoder/decoder.
*
* @returns 0
*
*/
int ff_v4l2_m2m_codec_end(AVCodecContext *avctx);
/**
* Reinitializes the V4L2m2mContext when the driver cant continue processing
* with the capture parameters.
*
* @param[in] ctx The V4L2m2mContext instantiated by the encoder/decoder.
*
* @returns 0 in case of success, negative number otherwise
*/
int ff_v4l2_m2m_codec_reinit(V4L2m2mContext *ctx);
/**
* Reinitializes the V4L2m2mContext when the driver cant continue processing
* with the any of the current V4L2Contexts (ie, changes in output and capture).
*
* @param[in] ctx The V4L2m2mContext instantiated by the encoder/decoder.
*
* @returns 0 in case of success, negative number otherwise
*/
int ff_v4l2_m2m_codec_full_reinit(V4L2m2mContext *ctx);
#endif /* AVCODEC_V4L2_M2M_H */

228
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/*
* V4L2 mem2mem decoders
*
* Copyright (C) 2017 Alexis Ballier <aballier@gentoo.org>
* Copyright (C) 2017 Jorge Ramirez <jorge.ramirez-ortiz@linaro.org>
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <linux/videodev2.h>
#include <sys/ioctl.h>
#include "libavutil/pixfmt.h"
#include "libavutil/pixdesc.h"
#include "libavutil/opt.h"
#include "libavcodec/avcodec.h"
#include "libavcodec/decode.h"
#include "v4l2_context.h"
#include "v4l2_m2m.h"
#include "v4l2_fmt.h"
static int v4l2_try_start(AVCodecContext *avctx)
{
V4L2m2mContext *s = avctx->priv_data;
V4L2Context *const capture = &s->capture;
V4L2Context *const output = &s->output;
struct v4l2_selection selection;
int ret;
/* 1. start the output process */
if (!output->streamon) {
ret = ff_v4l2_context_set_status(output, VIDIOC_STREAMON);
if (ret < 0) {
av_log(avctx, AV_LOG_DEBUG, "VIDIOC_STREAMON on output context\n");
return ret;
}
}
if (capture->streamon)
return 0;
/* 2. get the capture format */
capture->format.type = capture->type;
ret = ioctl(s->fd, VIDIOC_G_FMT, &capture->format);
if (ret) {
av_log(avctx, AV_LOG_WARNING, "VIDIOC_G_FMT ioctl\n");
return ret;
}
/* 2.1 update the AVCodecContext */
avctx->pix_fmt = ff_v4l2_format_v4l2_to_avfmt(capture->format.fmt.pix_mp.pixelformat, AV_CODEC_ID_RAWVIDEO);
capture->av_pix_fmt = avctx->pix_fmt;
/* 3. set the crop parameters */
selection.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
selection.r.height = avctx->coded_height;
selection.r.width = avctx->coded_width;
ret = ioctl(s->fd, VIDIOC_S_SELECTION, &selection);
if (!ret) {
ret = ioctl(s->fd, VIDIOC_G_SELECTION, &selection);
if (ret) {
av_log(avctx, AV_LOG_WARNING, "VIDIOC_G_SELECTION ioctl\n");
} else {
av_log(avctx, AV_LOG_DEBUG, "crop output %dx%d\n", selection.r.width, selection.r.height);
/* update the size of the resulting frame */
capture->height = selection.r.height;
capture->width = selection.r.width;
}
}
/* 4. init the capture context now that we have the capture format */
if (!capture->buffers) {
ret = ff_v4l2_context_init(capture);
if (ret) {
av_log(avctx, AV_LOG_DEBUG, "can't request output buffers\n");
return ret;
}
}
/* 5. start the capture process */
ret = ff_v4l2_context_set_status(capture, VIDIOC_STREAMON);
if (ret) {
av_log(avctx, AV_LOG_DEBUG, "VIDIOC_STREAMON, on capture context\n");
return ret;
}
return 0;
}
static int v4l2_prepare_decoder(V4L2m2mContext *s)
{
struct v4l2_event_subscription sub;
V4L2Context *output = &s->output;
int ret;
/**
* requirements
*/
memset(&sub, 0, sizeof(sub));
sub.type = V4L2_EVENT_SOURCE_CHANGE;
ret = ioctl(s->fd, VIDIOC_SUBSCRIBE_EVENT, &sub);
if ( ret < 0) {
if (output->height == 0 || output->width == 0) {
av_log(s->avctx, AV_LOG_ERROR,
"the v4l2 driver does not support VIDIOC_SUBSCRIBE_EVENT\n"
"you must provide codec_height and codec_width on input\n");
return ret;
}
}
return 0;
}
static int v4l2_receive_frame(AVCodecContext *avctx, AVFrame *frame)
{
V4L2m2mContext *s = avctx->priv_data;
V4L2Context *const capture = &s->capture;
V4L2Context *const output = &s->output;
AVPacket avpkt = {0};
int ret;
ret = ff_decode_get_packet(avctx, &avpkt);
if (ret < 0 && ret != AVERROR_EOF)
return ret;
if (s->draining)
goto dequeue;
ret = ff_v4l2_context_enqueue_packet(output, &avpkt);
if (ret < 0) {
if (ret != AVERROR(ENOMEM))
return ret;
/* no input buffers available, continue dequeing */
}
if (avpkt.size) {
ret = v4l2_try_start(avctx);
if (ret)
return 0;
}
dequeue:
return ff_v4l2_context_dequeue_frame(capture, frame);
}
static av_cold int v4l2_decode_init(AVCodecContext *avctx)
{
V4L2m2mContext *s = avctx->priv_data;
V4L2Context *capture = &s->capture;
V4L2Context *output = &s->output;
int ret;
/* if these dimensions are invalid (ie, 0 or too small) an event will be raised
* by the v4l2 driver; this event will trigger a full pipeline reconfig and
* the proper values will be retrieved from the kernel driver.
*/
output->height = capture->height = avctx->coded_height;
output->width = capture->width = avctx->coded_width;
output->av_codec_id = avctx->codec_id;
output->av_pix_fmt = AV_PIX_FMT_NONE;
capture->av_codec_id = AV_CODEC_ID_RAWVIDEO;
capture->av_pix_fmt = avctx->pix_fmt;
ret = ff_v4l2_m2m_codec_init(avctx);
if (ret) {
av_log(avctx, AV_LOG_ERROR, "can't configure decoder\n");
return ret;
}
return v4l2_prepare_decoder(s);
}
#define OFFSET(x) offsetof(V4L2m2mContext, x)
#define FLAGS AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_DECODING_PARAM
static const AVOption options[] = {
V4L_M2M_DEFAULT_OPTS,
{ "num_capture_buffers", "Number of buffers in the capture context",
OFFSET(capture.num_buffers), AV_OPT_TYPE_INT, {.i64 = 20}, 20, INT_MAX, FLAGS },
{ NULL},
};
#define M2MDEC(NAME, LONGNAME, CODEC, bsf_name) \
static const AVClass v4l2_m2m_ ## NAME ## _dec_class = {\
.class_name = #NAME "_v4l2_m2m_decoder",\
.item_name = av_default_item_name,\
.option = options,\
.version = LIBAVUTIL_VERSION_INT,\
};\
\
AVCodec ff_ ## NAME ## _v4l2m2m_decoder = { \
.name = #NAME "_v4l2m2m" ,\
.long_name = NULL_IF_CONFIG_SMALL("V4L2 mem2mem " LONGNAME " decoder wrapper"),\
.type = AVMEDIA_TYPE_VIDEO,\
.id = CODEC ,\
.priv_data_size = sizeof(V4L2m2mContext),\
.priv_class = &v4l2_m2m_ ## NAME ## _dec_class,\
.init = v4l2_decode_init,\
.receive_frame = v4l2_receive_frame,\
.close = ff_v4l2_m2m_codec_end,\
.bsfs = bsf_name, \
};
M2MDEC(h264, "H.264", AV_CODEC_ID_H264, "h264_mp4toannexb");
M2MDEC(hevc, "HEVC", AV_CODEC_ID_HEVC, "hevc_mp4toannexb");
M2MDEC(mpeg1, "MPEG1", AV_CODEC_ID_MPEG1VIDEO, NULL);
M2MDEC(mpeg2, "MPEG2", AV_CODEC_ID_MPEG2VIDEO, NULL);
M2MDEC(mpeg4, "MPEG4", AV_CODEC_ID_MPEG4, NULL);
M2MDEC(h263, "H.263", AV_CODEC_ID_H263, NULL);
M2MDEC(vc1 , "VC1", AV_CODEC_ID_VC1, NULL);
M2MDEC(vp8, "VP8", AV_CODEC_ID_VP8, NULL);
M2MDEC(vp9, "VP9", AV_CODEC_ID_VP9, NULL);

352
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/*
* V4L2 mem2mem encoders
*
* Copyright (C) 2017 Alexis Ballier <aballier@gentoo.org>
* Copyright (C) 2017 Jorge Ramirez <jorge.ramirez-ortiz@linaro.org>
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <linux/videodev2.h>
#include <sys/ioctl.h>
#include <search.h>
#include "libavcodec/avcodec.h"
#include "libavutil/pixdesc.h"
#include "libavutil/pixfmt.h"
#include "libavutil/opt.h"
#include "v4l2_context.h"
#include "v4l2_m2m.h"
#define MPEG_CID(x) V4L2_CID_MPEG_VIDEO_##x
#define MPEG_VIDEO(x) V4L2_MPEG_VIDEO_##x
static inline void v4l2_set_timeperframe(V4L2m2mContext *s, unsigned int num, unsigned int den)
{
struct v4l2_streamparm parm = { 0 };
parm.type = V4L2_TYPE_IS_MULTIPLANAR(s->output.type) ? V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE : V4L2_BUF_TYPE_VIDEO_OUTPUT;
parm.parm.output.timeperframe.denominator = den;
parm.parm.output.timeperframe.numerator = num;
if (ioctl(s->fd, VIDIOC_S_PARM, &parm) < 0)
av_log(s->avctx, AV_LOG_WARNING, "Failed to set timeperframe");
}
static inline void v4l2_set_ext_ctrl(V4L2m2mContext *s, unsigned int id, signed int value, const char *name)
{
struct v4l2_ext_controls ctrls = { 0 };
struct v4l2_ext_control ctrl = { 0 };
/* set ctrls */
ctrls.ctrl_class = V4L2_CTRL_CLASS_MPEG;
ctrls.controls = &ctrl;
ctrls.count = 1;
/* set ctrl*/
ctrl.value = value;
ctrl.id = id ;
if (ioctl(s->fd, VIDIOC_S_EXT_CTRLS, &ctrls) < 0)
av_log(s->avctx, AV_LOG_WARNING, "Failed to set %s\n", name);
else
av_log(s->avctx, AV_LOG_DEBUG, "Encoder: %s = %d\n", name, value);
}
static inline int v4l2_get_ext_ctrl(V4L2m2mContext *s, unsigned int id, signed int *value, const char *name)
{
struct v4l2_ext_controls ctrls = { 0 };
struct v4l2_ext_control ctrl = { 0 };
int ret;
/* set ctrls */
ctrls.ctrl_class = V4L2_CTRL_CLASS_MPEG;
ctrls.controls = &ctrl;
ctrls.count = 1;
/* set ctrl*/
ctrl.id = id ;
ret = ioctl(s->fd, VIDIOC_G_EXT_CTRLS, &ctrls);
if (ret < 0) {
av_log(s->avctx, AV_LOG_WARNING, "Failed to set %s\n", name);
return ret;
}
*value = ctrl.value;
return 0;
}
static int match_profile(const void *a, const void *b)
{
if (*(unsigned int *)a == *(unsigned int *)b)
return 0;
return 1;
}
static inline unsigned int v4l2_h264_profile_from_ff(int p)
{
struct h264_profile {
unsigned int ffmpeg_val;
unsigned int v4l2_val;
} *val, profile[] = {
{ FF_PROFILE_H264_CONSTRAINED_BASELINE, MPEG_VIDEO(H264_PROFILE_CONSTRAINED_BASELINE) },
{ FF_PROFILE_H264_HIGH_444_PREDICTIVE, MPEG_VIDEO(H264_PROFILE_HIGH_444_PREDICTIVE) },
{ FF_PROFILE_H264_HIGH_422_INTRA, MPEG_VIDEO(H264_PROFILE_HIGH_422_INTRA) },
{ FF_PROFILE_H264_HIGH_444_INTRA, MPEG_VIDEO(H264_PROFILE_HIGH_444_INTRA) },
{ FF_PROFILE_H264_HIGH_10_INTRA, MPEG_VIDEO(H264_PROFILE_HIGH_10_INTRA) },
{ FF_PROFILE_H264_HIGH_422, MPEG_VIDEO(H264_PROFILE_HIGH_422) },
{ FF_PROFILE_H264_BASELINE, MPEG_VIDEO(H264_PROFILE_BASELINE) },
{ FF_PROFILE_H264_EXTENDED, MPEG_VIDEO(H264_PROFILE_EXTENDED) },
{ FF_PROFILE_H264_HIGH_10, MPEG_VIDEO(H264_PROFILE_HIGH_10) },
{ FF_PROFILE_H264_MAIN, MPEG_VIDEO(H264_PROFILE_MAIN) },
{ FF_PROFILE_H264_HIGH, MPEG_VIDEO(H264_PROFILE_HIGH) },
};
size_t len = FF_ARRAY_ELEMS(profile);
val = lfind(&p, profile, &len, sizeof(profile[0]), match_profile);
if (val)
return val->v4l2_val;
return AVERROR(ENOENT);
}
static inline int v4l2_mpeg4_profile_from_ff(int p)
{
struct mpeg4_profile {
unsigned int ffmpeg_val;
unsigned int v4l2_val;
} *val, profile[] = {
{ FF_PROFILE_MPEG4_ADVANCED_CODING, MPEG_VIDEO(MPEG4_PROFILE_ADVANCED_CODING_EFFICIENCY) },
{ FF_PROFILE_MPEG4_ADVANCED_SIMPLE, MPEG_VIDEO(MPEG4_PROFILE_ADVANCED_SIMPLE) },
{ FF_PROFILE_MPEG4_SIMPLE_SCALABLE, MPEG_VIDEO(MPEG4_PROFILE_SIMPLE_SCALABLE) },
{ FF_PROFILE_MPEG4_SIMPLE, MPEG_VIDEO(MPEG4_PROFILE_SIMPLE) },
{ FF_PROFILE_MPEG4_CORE, MPEG_VIDEO(MPEG4_PROFILE_CORE) },
};
size_t len = FF_ARRAY_ELEMS(profile);
val = lfind(&p, profile, &len, sizeof(profile[0]), match_profile);
if (val)
return val->v4l2_val;
return AVERROR(ENOENT);
}
static int v4l2_check_b_frame_support(V4L2m2mContext *s)
{
if (s->avctx->max_b_frames)
av_log(s->avctx, AV_LOG_WARNING, "Encoder does not support b-frames yet\n");
v4l2_set_ext_ctrl(s, MPEG_CID(B_FRAMES), 0, "number of B-frames");
v4l2_get_ext_ctrl(s, MPEG_CID(B_FRAMES), &s->avctx->max_b_frames, "number of B-frames");
if (s->avctx->max_b_frames == 0)
return 0;
avpriv_report_missing_feature(s->avctx, "DTS/PTS calculation for V4L2 encoding");
return AVERROR_PATCHWELCOME;
}
static int v4l2_prepare_encoder(V4L2m2mContext *s)
{
AVCodecContext *avctx = s->avctx;
int qmin_cid, qmax_cid, qmin, qmax;
int ret, val;
/**
* requirements
*/
ret = v4l2_check_b_frame_support(s);
if (ret)
return ret;
/**
* settingss
*/
if (avctx->framerate.num || avctx->framerate.den)
v4l2_set_timeperframe(s, avctx->framerate.num, avctx->framerate.den);
/* set ext ctrls */
v4l2_set_ext_ctrl(s, MPEG_CID(HEADER_MODE), MPEG_VIDEO(HEADER_MODE_SEPARATE), "header mode");
v4l2_set_ext_ctrl(s, MPEG_CID(BITRATE) , avctx->bit_rate, "bit rate");
v4l2_set_ext_ctrl(s, MPEG_CID(GOP_SIZE), avctx->gop_size,"gop size");
av_log(avctx, AV_LOG_DEBUG,
"Encoder Context: id (%d), profile (%d), frame rate(%d/%d), number b-frames (%d), "
"gop size (%d), bit rate (%ld), qmin (%d), qmax (%d)\n",
avctx->codec_id, avctx->profile, avctx->framerate.num, avctx->framerate.den,
avctx->max_b_frames, avctx->gop_size, avctx->bit_rate, avctx->qmin, avctx->qmax);
switch (avctx->codec_id) {
case AV_CODEC_ID_H264:
val = v4l2_h264_profile_from_ff(avctx->profile);
if (val < 0)
av_log(avctx, AV_LOG_WARNING, "h264 profile not found\n");
else
v4l2_set_ext_ctrl(s, MPEG_CID(H264_PROFILE), val, "h264 profile");
qmin_cid = MPEG_CID(H264_MIN_QP);
qmax_cid = MPEG_CID(H264_MAX_QP);
qmin = 0;
qmax = 51;
break;
case AV_CODEC_ID_MPEG4:
val = v4l2_mpeg4_profile_from_ff(avctx->profile);
if (val < 0)
av_log(avctx, AV_LOG_WARNING, "mpeg4 profile not found\n");
else
v4l2_set_ext_ctrl(s, MPEG_CID(MPEG4_PROFILE), val, "mpeg4 profile");
qmin_cid = MPEG_CID(MPEG4_MIN_QP);
qmax_cid = MPEG_CID(MPEG4_MAX_QP);
if (avctx->flags & CODEC_FLAG_QPEL)
v4l2_set_ext_ctrl(s, MPEG_CID(MPEG4_QPEL), 1, "qpel");
qmin = 1;
qmax = 31;
break;
case AV_CODEC_ID_H263:
qmin_cid = MPEG_CID(H263_MIN_QP);
qmax_cid = MPEG_CID(H263_MAX_QP);
qmin = 1;
qmax = 31;
break;
case AV_CODEC_ID_VP8:
qmin_cid = MPEG_CID(VPX_MIN_QP);
qmax_cid = MPEG_CID(VPX_MAX_QP);
qmin = 0;
qmax = 127;
break;
case AV_CODEC_ID_VP9:
qmin_cid = MPEG_CID(VPX_MIN_QP);
qmax_cid = MPEG_CID(VPX_MAX_QP);
qmin = 0;
qmax = 255;
break;
default:
return 0;
}
if (qmin != avctx->qmin || qmax != avctx->qmax)
av_log(avctx, AV_LOG_WARNING, "Encoder adjusted: qmin (%d), qmax (%d)\n", qmin, qmax);
v4l2_set_ext_ctrl(s, qmin_cid, qmin, "minimum video quantizer scale");
v4l2_set_ext_ctrl(s, qmax_cid, qmax, "maximum video quantizer scale");
return 0;
}
static int v4l2_send_frame(AVCodecContext *avctx, const AVFrame *frame)
{
V4L2m2mContext *s = avctx->priv_data;
V4L2Context *const output = &s->output;
return ff_v4l2_context_enqueue_frame(output, frame);
}
static int v4l2_receive_packet(AVCodecContext *avctx, AVPacket *avpkt)
{
V4L2m2mContext *s = avctx->priv_data;
V4L2Context *const capture = &s->capture;
V4L2Context *const output = &s->output;
int ret;
if (s->draining)
goto dequeue;
if (!output->streamon) {
ret = ff_v4l2_context_set_status(output, VIDIOC_STREAMON);
if (ret) {
av_log(avctx, AV_LOG_ERROR, "VIDIOC_STREAMOFF failed on output context\n");
return ret;
}
}
if (!capture->streamon) {
ret = ff_v4l2_context_set_status(capture, VIDIOC_STREAMON);
if (ret) {
av_log(avctx, AV_LOG_ERROR, "VIDIOC_STREAMON failed on capture context\n");
return ret;
}
}
dequeue:
return ff_v4l2_context_dequeue_packet(capture, avpkt);
}
static av_cold int v4l2_encode_init(AVCodecContext *avctx)
{
V4L2m2mContext *s = avctx->priv_data;
V4L2Context *capture = &s->capture;
V4L2Context *output = &s->output;
int ret;
/* common settings output/capture */
output->height = capture->height = avctx->height;
output->width = capture->width = avctx->width;
/* output context */
output->av_codec_id = AV_CODEC_ID_RAWVIDEO;
output->av_pix_fmt = avctx->pix_fmt;
/* capture context */
capture->av_codec_id = avctx->codec_id;
capture->av_pix_fmt = AV_PIX_FMT_NONE;
ret = ff_v4l2_m2m_codec_init(avctx);
if (ret) {
av_log(avctx, AV_LOG_ERROR, "can't configure encoder\n");
return ret;
}
return v4l2_prepare_encoder(s);
}
#define OFFSET(x) offsetof(V4L2m2mContext, x)
#define FLAGS AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
static const AVOption options[] = {
V4L_M2M_DEFAULT_OPTS,
{ "num_capture_buffers", "Number of buffers in the capture context",
OFFSET(capture.num_buffers), AV_OPT_TYPE_INT, {.i64 = 4 }, 4, INT_MAX, FLAGS },
{ NULL },
};
#define M2MENC(NAME, LONGNAME, CODEC) \
static const AVClass v4l2_m2m_ ## NAME ## _enc_class = {\
.class_name = #NAME "_v4l2_m2m_encoder",\
.item_name = av_default_item_name,\
.option = options,\
.version = LIBAVUTIL_VERSION_INT,\
};\
\
AVCodec ff_ ## NAME ## _v4l2m2m_encoder = { \
.name = #NAME "_v4l2m2m" ,\
.long_name = NULL_IF_CONFIG_SMALL("V4L2 mem2mem " LONGNAME " encoder wrapper"),\
.type = AVMEDIA_TYPE_VIDEO,\
.id = CODEC ,\
.priv_data_size = sizeof(V4L2m2mContext),\
.priv_class = &v4l2_m2m_ ## NAME ##_enc_class,\
.init = v4l2_encode_init,\
.send_frame = v4l2_send_frame,\
.receive_packet = v4l2_receive_packet,\
.close = ff_v4l2_m2m_codec_end,\
};
M2MENC(mpeg4,"MPEG4", AV_CODEC_ID_MPEG4);
M2MENC(h263, "H.263", AV_CODEC_ID_H263);
M2MENC(h264, "H.264", AV_CODEC_ID_H264);
M2MENC(hevc, "HEVC", AV_CODEC_ID_HEVC);
M2MENC(vp8, "VP8", AV_CODEC_ID_VP8);