ffmpeg/libavcodec/libopenh264dec.c

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/*
* OpenH264 video decoder
* Copyright (C) 2016 Martin Storsjo
*
* 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 <wels/codec_api.h>
#include <wels/codec_ver.h>
#include "libavutil/common.h"
#include "libavutil/fifo.h"
#include "libavutil/imgutils.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/mathematics.h"
#include "libavutil/opt.h"
#include "avcodec.h"
#include "internal.h"
#include "libopenh264.h"
typedef struct SVCContext {
ISVCDecoder *decoder;
AVBSFContext *bsf;
AVFifoBuffer *packet_fifo;
AVPacket pkt_filtered;
} SVCContext;
static av_cold int svc_decode_close(AVCodecContext *avctx)
{
SVCContext *s = avctx->priv_data;
AVPacket pkt;
if (s->decoder)
WelsDestroyDecoder(s->decoder);
while (s->packet_fifo && av_fifo_size(s->packet_fifo) >= sizeof(pkt)) {
av_fifo_generic_read(s->packet_fifo, &pkt, sizeof(pkt), NULL);
av_packet_unref(&pkt);
}
av_bsf_free(&s->bsf);
av_packet_unref(&s->pkt_filtered);
av_fifo_free(s->packet_fifo);
return 0;
}
static av_cold int svc_decode_init(AVCodecContext *avctx)
{
SVCContext *s = avctx->priv_data;
SDecodingParam param = { 0 };
int err;
int log_level;
WelsTraceCallback callback_function;
if ((err = ff_libopenh264_check_version(avctx)) < 0)
return err;
s->packet_fifo = av_fifo_alloc(sizeof(AVPacket));
if (!s->packet_fifo) {
err = AVERROR(ENOMEM);
goto fail;
}
if (WelsCreateDecoder(&s->decoder)) {
av_log(avctx, AV_LOG_ERROR, "Unable to create decoder\n");
err = AVERROR_UNKNOWN;
goto fail;
}
// Pass all libopenh264 messages to our callback, to allow ourselves to filter them.
log_level = WELS_LOG_DETAIL;
callback_function = ff_libopenh264_trace_callback;
(*s->decoder)->SetOption(s->decoder, DECODER_OPTION_TRACE_LEVEL, &log_level);
(*s->decoder)->SetOption(s->decoder, DECODER_OPTION_TRACE_CALLBACK, (void *)&callback_function);
(*s->decoder)->SetOption(s->decoder, DECODER_OPTION_TRACE_CALLBACK_CONTEXT, (void *)&avctx);
#if !OPENH264_VER_AT_LEAST(1, 6)
param.eOutputColorFormat = videoFormatI420;
#endif
param.eEcActiveIdc = ERROR_CON_DISABLE;
param.sVideoProperty.eVideoBsType = VIDEO_BITSTREAM_DEFAULT;
if ((*s->decoder)->Initialize(s->decoder, &param) != cmResultSuccess) {
av_log(avctx, AV_LOG_ERROR, "Initialize failed\n");
err = AVERROR_UNKNOWN;
goto fail;
}
avctx->pix_fmt = AV_PIX_FMT_YUV420P;
fail:
return err;
}
static int init_bsf(AVCodecContext *avctx)
{
SVCContext *s = avctx->priv_data;
const AVBitStreamFilter *filter;
int ret;
if (s->bsf)
return 0;
// If the input stream already is annex b, this BSF only passes the
// packets through unchanged.
filter = av_bsf_get_by_name("h264_mp4toannexb");
if (!filter)
return AVERROR_BUG;
ret = av_bsf_alloc(filter, &s->bsf);
if (ret < 0)
return ret;
ret = avcodec_parameters_from_context(s->bsf->par_in, avctx);
if (ret < 0)
return ret;
s->bsf->time_base_in = avctx->time_base;
ret = av_bsf_init(s->bsf);
if (ret < 0)
return ret;
return ret;
}
static int svc_decode_frame(AVCodecContext *avctx, void *data,
int *got_frame, AVPacket *avpkt)
{
SVCContext *s = avctx->priv_data;
SBufferInfo info = { 0 };
uint8_t* ptrs[3];
int linesize[3];
AVFrame *avframe = data;
int ret;
DECODING_STATE state;
if ((ret = init_bsf(avctx)) < 0)
return ret;
if (avpkt->size) {
AVPacket input_ref = { 0 };
if (av_fifo_space(s->packet_fifo) < sizeof(input_ref)) {
ret = av_fifo_realloc2(s->packet_fifo,
av_fifo_size(s->packet_fifo) + sizeof(input_ref));
if (ret < 0)
return ret;
}
ret = av_packet_ref(&input_ref, avpkt);
if (ret < 0)
return ret;
av_fifo_generic_write(s->packet_fifo, &input_ref, sizeof(input_ref), NULL);
}
while (!*got_frame) {
/* prepare the input data -- convert to Annex B if needed */
if (s->pkt_filtered.size <= 0) {
AVPacket input_ref;
/* no more data */
if (av_fifo_size(s->packet_fifo) < sizeof(AVPacket))
return avpkt->size ? avpkt->size : 0;
av_packet_unref(&s->pkt_filtered);
av_fifo_generic_read(s->packet_fifo, &input_ref, sizeof(input_ref), NULL);
ret = av_bsf_send_packet(s->bsf, &input_ref);
if (ret < 0) {
av_packet_unref(&input_ref);
return ret;
}
ret = av_bsf_receive_packet(s->bsf, &s->pkt_filtered);
if (ret < 0)
av_packet_move_ref(&s->pkt_filtered, &input_ref);
else
av_packet_unref(&input_ref);
}
state = (*s->decoder)->DecodeFrame2(s->decoder, s->pkt_filtered.data, s->pkt_filtered.size, ptrs, &info);
s->pkt_filtered.size = 0;
if (state != dsErrorFree) {
av_log(avctx, AV_LOG_ERROR, "DecodeFrame2 failed\n");
return AVERROR_UNKNOWN;
}
if (info.iBufferStatus != 1) {
av_log(avctx, AV_LOG_DEBUG, "No frame produced\n");
continue;
}
ret = ff_set_dimensions(avctx, info.UsrData.sSystemBuffer.iWidth, info.UsrData.sSystemBuffer.iHeight);
if (ret < 0)
return ret;
// The decoder doesn't (currently) support decoding into a user
// provided buffer, so do a copy instead.
if (ff_get_buffer(avctx, avframe, 0) < 0) {
av_log(avctx, AV_LOG_ERROR, "Unable to allocate buffer\n");
return AVERROR(ENOMEM);
}
linesize[0] = info.UsrData.sSystemBuffer.iStride[0];
linesize[1] = linesize[2] = info.UsrData.sSystemBuffer.iStride[1];
av_image_copy(avframe->data, avframe->linesize, (const uint8_t **) ptrs, linesize, avctx->pix_fmt, avctx->width, avctx->height);
avframe->pts = s->pkt_filtered.pts;
avframe->pkt_dts = s->pkt_filtered.dts;
avframe->pkt_pts = s->pkt_filtered.pts;
*got_frame = 1;
}
return avpkt->size;
}
AVCodec ff_libopenh264_decoder = {
.name = "libopenh264",
.long_name = NULL_IF_CONFIG_SMALL("OpenH264 H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10"),
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_H264,
.priv_data_size = sizeof(SVCContext),
.init = svc_decode_init,
.decode = svc_decode_frame,
.close = svc_decode_close,
// The decoder doesn't currently support B-frames, and the decoder's API
// doesn't support reordering/delay, but the BSF could incur delay.
.capabilities = AV_CODEC_CAP_DELAY | AV_CODEC_CAP_DR1,
.caps_internal = FF_CODEC_CAP_SETS_PKT_DTS | FF_CODEC_CAP_INIT_THREADSAFE |
FF_CODEC_CAP_INIT_CLEANUP,
};