2017-09-21 03:55:40 +02:00
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/*
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* V4L2 mem2mem decoders
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*
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* Copyright (C) 2017 Alexis Ballier <aballier@gentoo.org>
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* Copyright (C) 2017 Jorge Ramirez <jorge.ramirez-ortiz@linaro.org>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <linux/videodev2.h>
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#include <sys/ioctl.h>
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#include "libavutil/pixfmt.h"
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#include "libavutil/pixdesc.h"
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#include "libavutil/opt.h"
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#include "libavcodec/avcodec.h"
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#include "libavcodec/decode.h"
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#include "v4l2_context.h"
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#include "v4l2_m2m.h"
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#include "v4l2_fmt.h"
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static int v4l2_try_start(AVCodecContext *avctx)
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{
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V4L2m2mContext *s = avctx->priv_data;
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V4L2Context *const capture = &s->capture;
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V4L2Context *const output = &s->output;
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struct v4l2_selection selection;
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int ret;
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/* 1. start the output process */
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if (!output->streamon) {
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ret = ff_v4l2_context_set_status(output, VIDIOC_STREAMON);
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if (ret < 0) {
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av_log(avctx, AV_LOG_DEBUG, "VIDIOC_STREAMON on output context\n");
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return ret;
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}
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}
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if (capture->streamon)
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return 0;
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/* 2. get the capture format */
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capture->format.type = capture->type;
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ret = ioctl(s->fd, VIDIOC_G_FMT, &capture->format);
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if (ret) {
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av_log(avctx, AV_LOG_WARNING, "VIDIOC_G_FMT ioctl\n");
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return ret;
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}
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/* 2.1 update the AVCodecContext */
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avctx->pix_fmt = ff_v4l2_format_v4l2_to_avfmt(capture->format.fmt.pix_mp.pixelformat, AV_CODEC_ID_RAWVIDEO);
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capture->av_pix_fmt = avctx->pix_fmt;
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/* 3. set the crop parameters */
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selection.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
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selection.r.height = avctx->coded_height;
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selection.r.width = avctx->coded_width;
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ret = ioctl(s->fd, VIDIOC_S_SELECTION, &selection);
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if (!ret) {
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ret = ioctl(s->fd, VIDIOC_G_SELECTION, &selection);
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if (ret) {
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av_log(avctx, AV_LOG_WARNING, "VIDIOC_G_SELECTION ioctl\n");
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} else {
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av_log(avctx, AV_LOG_DEBUG, "crop output %dx%d\n", selection.r.width, selection.r.height);
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/* update the size of the resulting frame */
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capture->height = selection.r.height;
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capture->width = selection.r.width;
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}
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}
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/* 4. init the capture context now that we have the capture format */
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if (!capture->buffers) {
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ret = ff_v4l2_context_init(capture);
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if (ret) {
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av_log(avctx, AV_LOG_DEBUG, "can't request output buffers\n");
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return ret;
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}
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}
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/* 5. start the capture process */
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ret = ff_v4l2_context_set_status(capture, VIDIOC_STREAMON);
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if (ret) {
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av_log(avctx, AV_LOG_DEBUG, "VIDIOC_STREAMON, on capture context\n");
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return ret;
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}
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return 0;
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}
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static int v4l2_prepare_decoder(V4L2m2mContext *s)
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{
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struct v4l2_event_subscription sub;
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V4L2Context *output = &s->output;
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int ret;
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/**
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* requirements
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*/
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memset(&sub, 0, sizeof(sub));
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sub.type = V4L2_EVENT_SOURCE_CHANGE;
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ret = ioctl(s->fd, VIDIOC_SUBSCRIBE_EVENT, &sub);
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if ( ret < 0) {
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if (output->height == 0 || output->width == 0) {
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av_log(s->avctx, AV_LOG_ERROR,
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"the v4l2 driver does not support VIDIOC_SUBSCRIBE_EVENT\n"
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"you must provide codec_height and codec_width on input\n");
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return ret;
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}
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}
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return 0;
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}
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static int v4l2_receive_frame(AVCodecContext *avctx, AVFrame *frame)
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{
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V4L2m2mContext *s = avctx->priv_data;
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V4L2Context *const capture = &s->capture;
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V4L2Context *const output = &s->output;
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AVPacket avpkt = {0};
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int ret;
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ret = ff_decode_get_packet(avctx, &avpkt);
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if (ret < 0 && ret != AVERROR_EOF)
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return ret;
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if (s->draining)
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goto dequeue;
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ret = ff_v4l2_context_enqueue_packet(output, &avpkt);
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if (ret < 0) {
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if (ret != AVERROR(ENOMEM))
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return ret;
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/* no input buffers available, continue dequeing */
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}
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if (avpkt.size) {
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ret = v4l2_try_start(avctx);
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if (ret)
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return 0;
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}
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dequeue:
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return ff_v4l2_context_dequeue_frame(capture, frame);
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}
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static av_cold int v4l2_decode_init(AVCodecContext *avctx)
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{
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V4L2m2mContext *s = avctx->priv_data;
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V4L2Context *capture = &s->capture;
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V4L2Context *output = &s->output;
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int ret;
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/* if these dimensions are invalid (ie, 0 or too small) an event will be raised
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* by the v4l2 driver; this event will trigger a full pipeline reconfig and
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* the proper values will be retrieved from the kernel driver.
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*/
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output->height = capture->height = avctx->coded_height;
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output->width = capture->width = avctx->coded_width;
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output->av_codec_id = avctx->codec_id;
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output->av_pix_fmt = AV_PIX_FMT_NONE;
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capture->av_codec_id = AV_CODEC_ID_RAWVIDEO;
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capture->av_pix_fmt = avctx->pix_fmt;
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ret = ff_v4l2_m2m_codec_init(avctx);
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if (ret) {
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av_log(avctx, AV_LOG_ERROR, "can't configure decoder\n");
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return ret;
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}
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return v4l2_prepare_decoder(s);
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}
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#define OFFSET(x) offsetof(V4L2m2mContext, x)
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#define FLAGS AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_DECODING_PARAM
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static const AVOption options[] = {
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V4L_M2M_DEFAULT_OPTS,
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{ "num_capture_buffers", "Number of buffers in the capture context",
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OFFSET(capture.num_buffers), AV_OPT_TYPE_INT, {.i64 = 20}, 20, INT_MAX, FLAGS },
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{ NULL},
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};
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#define M2MDEC(NAME, LONGNAME, CODEC, bsf_name) \
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static const AVClass v4l2_m2m_ ## NAME ## _dec_class = {\
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.class_name = #NAME "_v4l2_m2m_decoder",\
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.item_name = av_default_item_name,\
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.option = options,\
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.version = LIBAVUTIL_VERSION_INT,\
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};\
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\
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AVCodec ff_ ## NAME ## _v4l2m2m_decoder = { \
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.name = #NAME "_v4l2m2m" ,\
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.long_name = NULL_IF_CONFIG_SMALL("V4L2 mem2mem " LONGNAME " decoder wrapper"),\
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.type = AVMEDIA_TYPE_VIDEO,\
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.id = CODEC ,\
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.priv_data_size = sizeof(V4L2m2mContext),\
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.priv_class = &v4l2_m2m_ ## NAME ## _dec_class,\
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.init = v4l2_decode_init,\
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.receive_frame = v4l2_receive_frame,\
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.close = ff_v4l2_m2m_codec_end,\
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.bsfs = bsf_name, \
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2017-12-14 20:46:52 +02:00
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.capabilities = AV_CODEC_CAP_HARDWARE | AV_CODEC_CAP_DELAY, \
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2017-12-11 17:18:44 +02:00
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.wrapper_name = "v4l2m2m", \
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2017-09-21 03:55:40 +02:00
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};
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M2MDEC(h264, "H.264", AV_CODEC_ID_H264, "h264_mp4toannexb");
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M2MDEC(hevc, "HEVC", AV_CODEC_ID_HEVC, "hevc_mp4toannexb");
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M2MDEC(mpeg1, "MPEG1", AV_CODEC_ID_MPEG1VIDEO, NULL);
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M2MDEC(mpeg2, "MPEG2", AV_CODEC_ID_MPEG2VIDEO, NULL);
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M2MDEC(mpeg4, "MPEG4", AV_CODEC_ID_MPEG4, NULL);
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M2MDEC(h263, "H.263", AV_CODEC_ID_H263, NULL);
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M2MDEC(vc1 , "VC1", AV_CODEC_ID_VC1, NULL);
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M2MDEC(vp8, "VP8", AV_CODEC_ID_VP8, NULL);
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M2MDEC(vp9, "VP9", AV_CODEC_ID_VP9, NULL);
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