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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 "codec_internal.h"
#include "decode.h"
#include "libopenh264.h"
typedef struct SVCContext {
ISVCDecoder *decoder;
} SVCContext;
static av_cold int svc_decode_close(AVCodecContext *avctx)
{
SVCContext *s = avctx->priv_data;
if (s->decoder)
WelsDestroyDecoder(s->decoder);
return 0;
}
static av_cold int svc_decode_init(AVCodecContext *avctx)
{
SVCContext *s = avctx->priv_data;
SDecodingParam param = { 0 };
int log_level;
WelsTraceCallback callback_function;
if (WelsCreateDecoder(&s->decoder)) {
av_log(avctx, AV_LOG_ERROR, "Unable to create decoder\n");
return AVERROR_UNKNOWN;
}
// 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, ¶m) != cmResultSuccess) {
av_log(avctx, AV_LOG_ERROR, "Initialize failed\n");
return AVERROR_UNKNOWN;
}
avctx->pix_fmt = AV_PIX_FMT_YUV420P;
return 0;
}
static int svc_decode_frame(AVCodecContext *avctx, AVFrame *avframe,
int *got_frame, AVPacket *avpkt)
{
SVCContext *s = avctx->priv_data;
SBufferInfo info = { 0 };
uint8_t *ptrs[4] = { NULL };
int ret, linesize[4];
DECODING_STATE state;
#if OPENH264_VER_AT_LEAST(1, 7)
int opt;
#endif
if (!avpkt->data) {
#if OPENH264_VER_AT_LEAST(1, 9)
int end_of_stream = 1;
(*s->decoder)->SetOption(s->decoder, DECODER_OPTION_END_OF_STREAM, &end_of_stream);
state = (*s->decoder)->FlushFrame(s->decoder, ptrs, &info);
#else
return 0;
#endif
} else {
info.uiInBsTimeStamp = avpkt->pts;
#if OPENH264_VER_AT_LEAST(1, 4)
// Contrary to the name, DecodeFrameNoDelay actually does buffering
// and reordering of frames, and is the recommended decoding entry
// point since 1.4. This is essential for successfully decoding
// B-frames.
state = (*s->decoder)->DecodeFrameNoDelay(s->decoder, avpkt->data, avpkt->size, ptrs, &info);
#else
state = (*s->decoder)->DecodeFrame2(s->decoder, avpkt->data, avpkt->size, ptrs, &info);
#endif
}
if (state != dsErrorFree) {
av_log(avctx, AV_LOG_ERROR, "DecodeFrame failed\n");
return AVERROR_UNKNOWN;
}
if (info.iBufferStatus != 1) {
av_log(avctx, AV_LOG_DEBUG, "No frame produced\n");
return avpkt->size;
}
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];
linesize[3] = 0;
av_image_copy2(avframe->data, avframe->linesize, ptrs, linesize,
avctx->pix_fmt, avctx->width, avctx->height);
avframe->pts = info.uiOutYuvTimeStamp;
avframe->pkt_dts = AV_NOPTS_VALUE;
#if OPENH264_VER_AT_LEAST(1, 7)
(*s->decoder)->GetOption(s->decoder, DECODER_OPTION_PROFILE, &opt);
avctx->profile = opt;
(*s->decoder)->GetOption(s->decoder, DECODER_OPTION_LEVEL, &opt);
avctx->level = opt;
#endif
*got_frame = 1;
return avpkt->size;
}
const FFCodec ff_libopenh264_decoder = {
.p.name = "libopenh264",
CODEC_LONG_NAME("OpenH264 H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10"),
.p.type = AVMEDIA_TYPE_VIDEO,
.p.id = AV_CODEC_ID_H264,
.priv_data_size = sizeof(SVCContext),
.init = svc_decode_init,
FF_CODEC_DECODE_CB(svc_decode_frame),
.close = svc_decode_close,
.p.capabilities = AV_CODEC_CAP_DELAY | AV_CODEC_CAP_DR1,
.caps_internal = FF_CODEC_CAP_SETS_PKT_DTS |
FF_CODEC_CAP_INIT_CLEANUP,
.bsfs = "h264_mp4toannexb",
.p.wrapper_name = "libopenh264",
};
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