ffmpeg/libavcodec/mediacodecdec_h264.c

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/*
* Android MediaCodec H.264 decoder
*
* 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"
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#include "libavutil/common.h"
#include "libavutil/fifo.h"
#include "libavutil/opt.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/pixfmt.h"
#include "libavutil/atomic.h"
#include "avcodec.h"
#include "internal.h"
#include "mediacodecdec.h"
#include "mediacodec_wrapper.h"
#define CODEC_MIME "video/avc"
typedef struct MediaCodecH264DecContext {
MediaCodecDecContext ctx;
AVBSFContext *bsf;
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AVFifoBuffer *fifo;
AVPacket filtered_pkt;
} MediaCodecH264DecContext;
static int h264_extradata_to_annexb_sps_pps(AVCodecContext *avctx,
uint8_t **extradata_annexb, int *extradata_annexb_size,
int *sps_offset, int *sps_size,
int *pps_offset, int *pps_size)
{
uint16_t unit_size;
uint64_t total_size = 0;
uint8_t i, j, unit_nb;
uint8_t sps_seen = 0;
uint8_t pps_seen = 0;
const uint8_t *extradata;
static const uint8_t nalu_header[4] = { 0x00, 0x00, 0x00, 0x01 };
if (avctx->extradata_size < 8) {
av_log(avctx, AV_LOG_ERROR,
"Too small extradata size, corrupted stream or invalid MP4/AVCC bitstream\n");
return AVERROR(EINVAL);
}
*extradata_annexb = NULL;
*extradata_annexb_size = 0;
*sps_offset = *sps_size = 0;
*pps_offset = *pps_size = 0;
extradata = avctx->extradata + 4;
/* skip length size */
extradata++;
for (j = 0; j < 2; j ++) {
if (j == 0) {
/* number of sps unit(s) */
unit_nb = *extradata++ & 0x1f;
} else {
/* number of pps unit(s) */
unit_nb = *extradata++;
}
for (i = 0; i < unit_nb; i++) {
int err;
unit_size = AV_RB16(extradata);
total_size += unit_size + 4;
if (total_size > INT_MAX) {
av_log(avctx, AV_LOG_ERROR,
"Too big extradata size, corrupted stream or invalid MP4/AVCC bitstream\n");
av_freep(extradata_annexb);
return AVERROR(EINVAL);
}
if (extradata + 2 + unit_size > avctx->extradata + avctx->extradata_size) {
av_log(avctx, AV_LOG_ERROR, "Packet header is not contained in global extradata, "
"corrupted stream or invalid MP4/AVCC bitstream\n");
av_freep(extradata_annexb);
return AVERROR(EINVAL);
}
if ((err = av_reallocp(extradata_annexb, total_size)) < 0) {
return err;
}
memcpy(*extradata_annexb + total_size - unit_size - 4, nalu_header, 4);
memcpy(*extradata_annexb + total_size - unit_size, extradata + 2, unit_size);
extradata += 2 + unit_size;
}
if (unit_nb) {
if (j == 0) {
sps_seen = 1;
*sps_size = total_size;
} else {
pps_seen = 1;
*pps_size = total_size - *sps_size;
*pps_offset = *sps_size;
}
}
}
*extradata_annexb_size = total_size;
if (!sps_seen)
av_log(avctx, AV_LOG_WARNING,
"Warning: SPS NALU missing or invalid. "
"The resulting stream may not play.\n");
if (!pps_seen)
av_log(avctx, AV_LOG_WARNING,
"Warning: PPS NALU missing or invalid. "
"The resulting stream may not play.\n");
return 0;
}
static av_cold int mediacodec_decode_close(AVCodecContext *avctx)
{
MediaCodecH264DecContext *s = avctx->priv_data;
ff_mediacodec_dec_close(avctx, &s->ctx);
av_fifo_free(s->fifo);
av_bsf_free(&s->bsf);
av_packet_unref(&s->filtered_pkt);
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return 0;
}
static av_cold int mediacodec_decode_init(AVCodecContext *avctx)
{
int ret;
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;
}
ff_AMediaFormat_setString(format, "mime", CODEC_MIME);
ff_AMediaFormat_setInt32(format, "width", avctx->width);
ff_AMediaFormat_setInt32(format, "height", avctx->height);
if (avctx->extradata[0] == 1) {
uint8_t *extradata = NULL;
int extradata_size = 0;
int sps_offset, sps_size;
int pps_offset, pps_size;
if ((ret = h264_extradata_to_annexb_sps_pps(avctx, &extradata, &extradata_size,
&sps_offset, &sps_size, &pps_offset, &pps_size)) < 0) {
goto done;
}
ff_AMediaFormat_setBuffer(format, "csd-0", extradata + sps_offset, sps_size);
ff_AMediaFormat_setBuffer(format, "csd-1", extradata + pps_offset, pps_size);
av_freep(&extradata);
} else {
ff_AMediaFormat_setBuffer(format, "csd-0", avctx->extradata, avctx->extradata_size);
}
if ((ret = ff_mediacodec_dec_init(avctx, &s->ctx, CODEC_MIME, format)) < 0) {
goto done;
}
av_log(avctx, AV_LOG_INFO, "MediaCodec started successfully, ret = %d\n", ret);
s->fifo = av_fifo_alloc(sizeof(AVPacket));
if (!s->fifo) {
ret = AVERROR(ENOMEM);
goto done;
}
const AVBitStreamFilter *bsf = av_bsf_get_by_name("h264_mp4toannexb");
if(!bsf) {
ret = AVERROR_BSF_NOT_FOUND;
goto done;
}
if ((ret = av_bsf_alloc(bsf, &s->bsf))) {
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goto done;
}
if (((ret = avcodec_parameters_from_context(s->bsf->par_in, avctx)) < 0) ||
((ret = av_bsf_init(s->bsf)) < 0)) {
goto done;
}
av_init_packet(&s->filtered_pkt);
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done:
if (format) {
ff_AMediaFormat_delete(format);
}
if (ret < 0) {
mediacodec_decode_close(avctx);
}
return ret;
}
static int mediacodec_process_data(AVCodecContext *avctx, AVFrame *frame,
int *got_frame, AVPacket *pkt)
{
MediaCodecH264DecContext *s = avctx->priv_data;
return ff_mediacodec_dec_decode(avctx, &s->ctx, frame, got_frame, pkt);
}
static int mediacodec_decode_frame(AVCodecContext *avctx, void *data,
int *got_frame, AVPacket *avpkt)
{
MediaCodecH264DecContext *s = avctx->priv_data;
AVFrame *frame = data;
int ret;
/* buffer the input packet */
if (avpkt->size) {
AVPacket input_pkt = { 0 };
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if (av_fifo_space(s->fifo) < sizeof(input_pkt)) {
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ret = av_fifo_realloc2(s->fifo,
av_fifo_size(s->fifo) + sizeof(input_pkt));
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if (ret < 0)
return ret;
}
ret = av_packet_ref(&input_pkt, avpkt);
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if (ret < 0)
return ret;
av_fifo_generic_write(s->fifo, &input_pkt, sizeof(input_pkt), NULL);
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}
/* process buffered data */
while (!*got_frame) {
/* prepare the input data -- convert to Annex B if needed */
if (s->filtered_pkt.size <= 0) {
AVPacket input_pkt = { 0 };
av_packet_unref(&s->filtered_pkt);
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/* no more data */
if (av_fifo_size(s->fifo) < sizeof(AVPacket)) {
return avpkt->size ? avpkt->size :
ff_mediacodec_dec_decode(avctx, &s->ctx, frame, got_frame, avpkt);
}
av_fifo_generic_read(s->fifo, &input_pkt, sizeof(input_pkt), NULL);
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ret = av_bsf_send_packet(s->bsf, &input_pkt);
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if (ret < 0) {
return ret;
}
ret = av_bsf_receive_packet(s->bsf, &s->filtered_pkt);
if (ret == AVERROR(EAGAIN)) {
goto done;
}
/* h264_mp4toannexb is used here and does not requires flushing */
av_assert0(ret != AVERROR_EOF);
if (ret < 0) {
return ret;
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}
}
ret = mediacodec_process_data(avctx, frame, got_frame, &s->filtered_pkt);
if (ret < 0)
return ret;
s->filtered_pkt.size -= ret;
s->filtered_pkt.data += ret;
}
done:
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return avpkt->size;
}
static void mediacodec_decode_flush(AVCodecContext *avctx)
{
MediaCodecH264DecContext *s = avctx->priv_data;
while (av_fifo_size(s->fifo)) {
AVPacket pkt;
av_fifo_generic_read(s->fifo, &pkt, sizeof(pkt), NULL);
av_packet_unref(&pkt);
}
av_fifo_reset(s->fifo);
av_packet_unref(&s->filtered_pkt);
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ff_mediacodec_dec_flush(avctx, &s->ctx);
}
AVCodec ff_h264_mediacodec_decoder = {
.name = "h264_mediacodec",
.long_name = NULL_IF_CONFIG_SMALL("H.264 Android MediaCodec decoder"),
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_H264,
.priv_data_size = sizeof(MediaCodecH264DecContext),
.init = mediacodec_decode_init,
.decode = mediacodec_decode_frame,
.flush = mediacodec_decode_flush,
.close = mediacodec_decode_close,
.capabilities = CODEC_CAP_DELAY,
};