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FFmpeg/libavcodec/mediacodecdec.c
Aman Gupta 3172b31223 avcodec/mediacodecdec: fix immediate EAGAIN with buffered packet 
In cases where the mediacodec decoder consumed a partial packet,
receive_frame() would start returning EAGAIN if the rest of the
packet couldn't be flushed and no frames were immediately available.

This fixes receive_frame() to perform its normal blocking wait for
new frames before returning EAGAIN. Fixes an issue I could reproduce
fairly often on a FireOS 6 device, and reported to be happening
intermittently by two mpv users.

Signed-off-by: Aman Gupta <aman@tmm1.net>
Signed-off-by: Matthieu Bouron <matthieu.bouron@gmail.com>
2018-03-13 12:32:08 -07:00

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/*
* Android MediaCodec MPEG-2 / H.264 / H.265 / MPEG-4 / VP8 / VP9 decoders
*
* Copyright (c) 2015-2016 Matthieu Bouron <matthieu.bouron stupeflix.com>
*
* 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 <stdint.h>
#include <string.h>
#include "libavutil/avassert.h"
#include "libavutil/common.h"
#include "libavutil/opt.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/pixfmt.h"
#include "libavutil/internal.h"
#include "avcodec.h"
#include "decode.h"
#include "h264_parse.h"
#include "hevc_parse.h"
#include "hwaccel.h"
#include "internal.h"
#include "mediacodec_wrapper.h"
#include "mediacodecdec_common.h"
typedef struct MediaCodecH264DecContext {
AVClass *avclass;
MediaCodecDecContext *ctx;
AVPacket buffered_pkt;
int delay_flush;
} MediaCodecH264DecContext;
static av_cold int mediacodec_decode_close(AVCodecContext *avctx)
{
MediaCodecH264DecContext *s = avctx->priv_data;
ff_mediacodec_dec_close(avctx, s->ctx);
s->ctx = NULL;
av_packet_unref(&s->buffered_pkt);
return 0;
}
#if CONFIG_H264_MEDIACODEC_DECODER || CONFIG_HEVC_MEDIACODEC_DECODER
static int h2645_ps_to_nalu(const uint8_t *src, int src_size, uint8_t **out, int *out_size)
{
int i;
int ret = 0;
uint8_t *p = NULL;
static const uint8_t nalu_header[] = { 0x00, 0x00, 0x00, 0x01 };
if (!out || !out_size) {
return AVERROR(EINVAL);
}
p = av_malloc(sizeof(nalu_header) + src_size);
if (!p) {
return AVERROR(ENOMEM);
}
*out = p;
*out_size = sizeof(nalu_header) + src_size;
memcpy(p, nalu_header, sizeof(nalu_header));
memcpy(p + sizeof(nalu_header), src, src_size);
/* Escape 0x00, 0x00, 0x0{0-3} pattern */
for (i = 4; i < *out_size; i++) {
if (i < *out_size - 3 &&
p[i + 0] == 0 &&
p[i + 1] == 0 &&
p[i + 2] <= 3) {
uint8_t *new;
*out_size += 1;
new = av_realloc(*out, *out_size);
if (!new) {
ret = AVERROR(ENOMEM);
goto done;
}
*out = p = new;
i = i + 2;
memmove(p + i + 1, p + i, *out_size - (i + 1));
p[i] = 0x03;
}
}
done:
if (ret < 0) {
av_freep(out);
*out_size = 0;
}
return ret;
}
#endif
#if CONFIG_H264_MEDIACODEC_DECODER
static int h264_set_extradata(AVCodecContext *avctx, FFAMediaFormat *format)
{
int i;
int ret;
H264ParamSets ps;
const PPS *pps = NULL;
const SPS *sps = NULL;
int is_avc = 0;
int nal_length_size = 0;
memset(&ps, 0, sizeof(ps));
ret = ff_h264_decode_extradata(avctx->extradata, avctx->extradata_size,
&ps, &is_avc, &nal_length_size, 0, avctx);
if (ret < 0) {
goto done;
}
for (i = 0; i < MAX_PPS_COUNT; i++) {
if (ps.pps_list[i]) {
pps = (const PPS*)ps.pps_list[i]->data;
break;
}
}
if (pps) {
if (ps.sps_list[pps->sps_id]) {
sps = (const SPS*)ps.sps_list[pps->sps_id]->data;
}
}
if (pps && sps) {
uint8_t *data = NULL;
int data_size = 0;
if ((ret = h2645_ps_to_nalu(sps->data, sps->data_size, &data, &data_size)) < 0) {
goto done;
}
ff_AMediaFormat_setBuffer(format, "csd-0", (void*)data, data_size);
av_freep(&data);
if ((ret = h2645_ps_to_nalu(pps->data, pps->data_size, &data, &data_size)) < 0) {
goto done;
}
ff_AMediaFormat_setBuffer(format, "csd-1", (void*)data, data_size);
av_freep(&data);
} else {
av_log(avctx, AV_LOG_ERROR, "Could not extract PPS/SPS from extradata");
ret = AVERROR_INVALIDDATA;
}
done:
ff_h264_ps_uninit(&ps);
return ret;
}
#endif
#if CONFIG_HEVC_MEDIACODEC_DECODER
static int hevc_set_extradata(AVCodecContext *avctx, FFAMediaFormat *format)
{
int i;
int ret;
HEVCParamSets ps;
HEVCSEI sei;
const HEVCVPS *vps = NULL;
const HEVCPPS *pps = NULL;
const HEVCSPS *sps = NULL;
int is_nalff = 0;
int nal_length_size = 0;
uint8_t *vps_data = NULL;
uint8_t *sps_data = NULL;
uint8_t *pps_data = NULL;
int vps_data_size = 0;
int sps_data_size = 0;
int pps_data_size = 0;
memset(&ps, 0, sizeof(ps));
memset(&sei, 0, sizeof(sei));
ret = ff_hevc_decode_extradata(avctx->extradata, avctx->extradata_size,
&ps, &sei, &is_nalff, &nal_length_size, 0, 1, avctx);
if (ret < 0) {
goto done;
}
for (i = 0; i < HEVC_MAX_VPS_COUNT; i++) {
if (ps.vps_list[i]) {
vps = (const HEVCVPS*)ps.vps_list[i]->data;
break;
}
}
for (i = 0; i < HEVC_MAX_PPS_COUNT; i++) {
if (ps.pps_list[i]) {
pps = (const HEVCPPS*)ps.pps_list[i]->data;
break;
}
}
if (pps) {
if (ps.sps_list[pps->sps_id]) {
sps = (const HEVCSPS*)ps.sps_list[pps->sps_id]->data;
}
}
if (vps && pps && sps) {
uint8_t *data;
int data_size;
if ((ret = h2645_ps_to_nalu(vps->data, vps->data_size, &vps_data, &vps_data_size)) < 0 ||
(ret = h2645_ps_to_nalu(sps->data, sps->data_size, &sps_data, &sps_data_size)) < 0 ||
(ret = h2645_ps_to_nalu(pps->data, pps->data_size, &pps_data, &pps_data_size)) < 0) {
goto done;
}
data_size = vps_data_size + sps_data_size + pps_data_size;
data = av_mallocz(data_size);
if (!data) {
ret = AVERROR(ENOMEM);
goto done;
}
memcpy(data , vps_data, vps_data_size);
memcpy(data + vps_data_size , sps_data, sps_data_size);
memcpy(data + vps_data_size + sps_data_size, pps_data, pps_data_size);
ff_AMediaFormat_setBuffer(format, "csd-0", data, data_size);
av_freep(&data);
} else {
av_log(avctx, AV_LOG_ERROR, "Could not extract VPS/PPS/SPS from extradata");
ret = AVERROR_INVALIDDATA;
}
done:
ff_hevc_ps_uninit(&ps);
av_freep(&vps_data);
av_freep(&sps_data);
av_freep(&pps_data);
return ret;
}
#endif
#if CONFIG_MPEG2_MEDIACODEC_DECODER || \
CONFIG_MPEG4_MEDIACODEC_DECODER || \
CONFIG_VP8_MEDIACODEC_DECODER || \
CONFIG_VP9_MEDIACODEC_DECODER
static int common_set_extradata(AVCodecContext *avctx, FFAMediaFormat *format)
{
int ret = 0;
if (avctx->extradata) {
ff_AMediaFormat_setBuffer(format, "csd-0", avctx->extradata, avctx->extradata_size);
}
return ret;
}
#endif
static av_cold int mediacodec_decode_init(AVCodecContext *avctx)
{
int ret;
const char *codec_mime = NULL;
FFAMediaFormat *format = NULL;
MediaCodecH264DecContext *s = avctx->priv_data;
format = ff_AMediaFormat_new();
if (!format) {
av_log(avctx, AV_LOG_ERROR, "Failed to create media format\n");
ret = AVERROR_EXTERNAL;
goto done;
}
switch (avctx->codec_id) {
#if CONFIG_H264_MEDIACODEC_DECODER
case AV_CODEC_ID_H264:
codec_mime = "video/avc";
ret = h264_set_extradata(avctx, format);
if (ret < 0)
goto done;
break;
#endif
#if CONFIG_HEVC_MEDIACODEC_DECODER
case AV_CODEC_ID_HEVC:
codec_mime = "video/hevc";
ret = hevc_set_extradata(avctx, format);
if (ret < 0)
goto done;
break;
#endif
#if CONFIG_MPEG2_MEDIACODEC_DECODER
case AV_CODEC_ID_MPEG2VIDEO:
codec_mime = "video/mpeg2";
ret = common_set_extradata(avctx, format);
if (ret < 0)
goto done;
break;
#endif
#if CONFIG_MPEG4_MEDIACODEC_DECODER
case AV_CODEC_ID_MPEG4:
codec_mime = "video/mp4v-es",
ret = common_set_extradata(avctx, format);
if (ret < 0)
goto done;
break;
#endif
#if CONFIG_VP8_MEDIACODEC_DECODER
case AV_CODEC_ID_VP8:
codec_mime = "video/x-vnd.on2.vp8";
ret = common_set_extradata(avctx, format);
if (ret < 0)
goto done;
break;
#endif
#if CONFIG_VP9_MEDIACODEC_DECODER
case AV_CODEC_ID_VP9:
codec_mime = "video/x-vnd.on2.vp9";
ret = common_set_extradata(avctx, format);
if (ret < 0)
goto done;
break;
#endif
default:
av_assert0(0);
}
ff_AMediaFormat_setString(format, "mime", codec_mime);
ff_AMediaFormat_setInt32(format, "width", avctx->width);
ff_AMediaFormat_setInt32(format, "height", avctx->height);
s->ctx = av_mallocz(sizeof(*s->ctx));
if (!s->ctx) {
av_log(avctx, AV_LOG_ERROR, "Failed to allocate MediaCodecDecContext\n");
ret = AVERROR(ENOMEM);
goto done;
}
s->ctx->delay_flush = s->delay_flush;
if ((ret = ff_mediacodec_dec_init(avctx, s->ctx, codec_mime, format)) < 0) {
s->ctx = NULL;
goto done;
}
av_log(avctx, AV_LOG_INFO, "MediaCodec started successfully, ret = %d\n", ret);
done:
if (format) {
ff_AMediaFormat_delete(format);
}
if (ret < 0) {
mediacodec_decode_close(avctx);
}
return ret;
}
static int mediacodec_send_receive(AVCodecContext *avctx,
MediaCodecH264DecContext *s,
AVFrame *frame, bool wait)
{
int ret;
/* send any pending data from buffered packet */
while (s->buffered_pkt.size) {
ret = ff_mediacodec_dec_send(avctx, s->ctx, &s->buffered_pkt);
if (ret == AVERROR(EAGAIN))
break;
else if (ret < 0)
return ret;
s->buffered_pkt.size -= ret;
s->buffered_pkt.data += ret;
if (s->buffered_pkt.size <= 0)
av_packet_unref(&s->buffered_pkt);
}
/* check for new frame */
return ff_mediacodec_dec_receive(avctx, s->ctx, frame, wait);
}
static int mediacodec_receive_frame(AVCodecContext *avctx, AVFrame *frame)
{
MediaCodecH264DecContext *s = avctx->priv_data;
int ret;
/*
* MediaCodec.flush() discards both input and output buffers, thus we
* need to delay the call to this function until the user has released or
* renderered the frames he retains.
*
* After we have buffered an input packet, check if the codec is in the
* flushing state. If it is, we need to call ff_mediacodec_dec_flush.
*
* ff_mediacodec_dec_flush returns 0 if the flush cannot be performed on
* the codec (because the user retains frames). The codec stays in the
* flushing state.
*
* ff_mediacodec_dec_flush returns 1 if the flush can actually be
* performed on the codec. The codec leaves the flushing state and can
* process again packets.
*
* ff_mediacodec_dec_flush returns a negative value if an error has
* occurred.
*
*/
if (ff_mediacodec_dec_is_flushing(avctx, s->ctx)) {
if (!ff_mediacodec_dec_flush(avctx, s->ctx)) {
return AVERROR(EAGAIN);
}
}
/* flush buffered packet and check for new frame */
ret = mediacodec_send_receive(avctx, s, frame, false);
if (ret != AVERROR(EAGAIN))
return ret;
/* skip fetching new packet if we still have one buffered */
if (s->buffered_pkt.size > 0)
return mediacodec_send_receive(avctx, s, frame, true);
/* fetch new packet or eof */
ret = ff_decode_get_packet(avctx, &s->buffered_pkt);
if (ret == AVERROR_EOF) {
AVPacket null_pkt = { 0 };
ret = ff_mediacodec_dec_send(avctx, s->ctx, &null_pkt);
if (ret < 0)
return ret;
}
else if (ret < 0)
return ret;
/* crank decoder with new packet */
return mediacodec_send_receive(avctx, s, frame, true);
}
static void mediacodec_decode_flush(AVCodecContext *avctx)
{
MediaCodecH264DecContext *s = avctx->priv_data;
av_packet_unref(&s->buffered_pkt);
ff_mediacodec_dec_flush(avctx, s->ctx);
}
static const AVCodecHWConfigInternal *mediacodec_hw_configs[] = {
&(const AVCodecHWConfigInternal) {
.public = {
.pix_fmt = AV_PIX_FMT_MEDIACODEC,
.methods = AV_CODEC_HW_CONFIG_METHOD_AD_HOC |
AV_CODEC_HW_CONFIG_METHOD_HW_DEVICE_CTX,
.device_type = AV_HWDEVICE_TYPE_MEDIACODEC,
},
.hwaccel = NULL,
},
NULL
};
#define OFFSET(x) offsetof(MediaCodecH264DecContext, x)
#define VD AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_DECODING_PARAM
static const AVOption ff_mediacodec_vdec_options[] = {
{ "delay_flush", "Delay flush until hw output buffers are returned to the decoder",
OFFSET(delay_flush), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, VD },
{ NULL }
};
#define DECLARE_MEDIACODEC_VCLASS(short_name) \
static const AVClass ff_##short_name##_mediacodec_dec_class = { \
.class_name = #short_name "_mediacodec", \
.item_name = av_default_item_name, \
.option = ff_mediacodec_vdec_options, \
.version = LIBAVUTIL_VERSION_INT, \
};
#define DECLARE_MEDIACODEC_VDEC(short_name, full_name, codec_id, bsf) \
DECLARE_MEDIACODEC_VCLASS(short_name) \
AVCodec ff_##short_name##_mediacodec_decoder = { \
.name = #short_name "_mediacodec", \
.long_name = NULL_IF_CONFIG_SMALL(full_name " Android MediaCodec decoder"), \
.type = AVMEDIA_TYPE_VIDEO, \
.id = codec_id, \
.priv_class = &ff_##short_name##_mediacodec_dec_class, \
.priv_data_size = sizeof(MediaCodecH264DecContext), \
.init = mediacodec_decode_init, \
.receive_frame = mediacodec_receive_frame, \
.flush = mediacodec_decode_flush, \
.close = mediacodec_decode_close, \
.capabilities = AV_CODEC_CAP_DELAY | AV_CODEC_CAP_AVOID_PROBING | AV_CODEC_CAP_HARDWARE, \
.caps_internal = FF_CODEC_CAP_SETS_PKT_DTS, \
.bsfs = bsf, \
.hw_configs = mediacodec_hw_configs, \
.wrapper_name = "mediacodec", \
}; \
#if CONFIG_H264_MEDIACODEC_DECODER
DECLARE_MEDIACODEC_VDEC(h264, "H.264", AV_CODEC_ID_H264, "h264_mp4toannexb")
#endif
#if CONFIG_HEVC_MEDIACODEC_DECODER
DECLARE_MEDIACODEC_VDEC(hevc, "H.265", AV_CODEC_ID_HEVC, "hevc_mp4toannexb")
#endif
#if CONFIG_MPEG2_MEDIACODEC_DECODER
DECLARE_MEDIACODEC_VDEC(mpeg2, "MPEG-2", AV_CODEC_ID_MPEG2VIDEO, NULL)
#endif
#if CONFIG_MPEG4_MEDIACODEC_DECODER
DECLARE_MEDIACODEC_VDEC(mpeg4, "MPEG-4", AV_CODEC_ID_MPEG4, NULL)
#endif
#if CONFIG_VP8_MEDIACODEC_DECODER
DECLARE_MEDIACODEC_VDEC(vp8, "VP8", AV_CODEC_ID_VP8, NULL)
#endif
#if CONFIG_VP9_MEDIACODEC_DECODER
DECLARE_MEDIACODEC_VDEC(vp9, "VP9", AV_CODEC_ID_VP9, NULL)
#endif
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