ffmpeg/libavcodec/mediacodecdec_h264.c

372 lines
10 KiB
C

/*
* 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"
#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 "h264.h"
#include "internal.h"
#include "mediacodecdec.h"
#include "mediacodec_wrapper.h"
#define CODEC_MIME "video/avc"
typedef struct MediaCodecH264DecContext {
MediaCodecDecContext *ctx;
AVBSFContext *bsf;
AVFifoBuffer *fifo;
AVPacket filtered_pkt;
} 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_fifo_free(s->fifo);
av_bsf_free(&s->bsf);
av_packet_unref(&s->filtered_pkt);
return 0;
}
static int h264_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 + 3;
memmove(p + i, p + i - 1, *out_size - i);
p[i - 1] = 0x03;
}
}
done:
if (ret < 0) {
av_freep(out);
*out_size = 0;
}
return ret;
}
static av_cold int mediacodec_decode_init(AVCodecContext *avctx)
{
int i;
int ret;
H264ParamSets ps;
const PPS *pps = NULL;
const SPS *sps = NULL;
int is_avc = 0;
int nal_length_size = 0;
FFAMediaFormat *format = NULL;
MediaCodecH264DecContext *s = avctx->priv_data;
memset(&ps, 0, sizeof(ps));
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);
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;
size_t data_size = 0;
if ((ret = h264_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 = h264_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;
goto done;
}
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;
}
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);
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))) {
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);
done:
if (format) {
ff_AMediaFormat_delete(format);
}
if (ret < 0) {
mediacodec_decode_close(avctx);
}
ff_h264_ps_uninit(&ps);
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 };
if (av_fifo_space(s->fifo) < sizeof(input_pkt)) {
ret = av_fifo_realloc2(s->fifo,
av_fifo_size(s->fifo) + sizeof(input_pkt));
if (ret < 0)
return ret;
}
ret = av_packet_ref(&input_pkt, avpkt);
if (ret < 0)
return ret;
av_fifo_generic_write(s->fifo, &input_pkt, sizeof(input_pkt), NULL);
}
/*
* 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 avpkt->size;
}
}
/* 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);
/* 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);
ret = av_bsf_send_packet(s->bsf, &input_pkt);
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;
}
}
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:
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);
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,
.caps_internal = FF_CODEC_CAP_SETS_PKT_DTS,
};