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extern "C" {
#include <libavcodec/avcodec.h>
#include <libavcodec/bsf.h>
#include <libavformat/avformat.h>
#include <libavformat/avio.h>
}
class Demuxer {
private:
AVFormatContext* fmtCtx = NULL;
AVBSFContext* bsfCtx = NULL;
AVPacket pkt, pktFiltered;
AVCodecID eVideoCodec;
uint8_t* dataWithHeader = NULL;
bool bMp4H264, bMp4HEVC, bMp4MPEG4;
unsigned int frameCount = 0;
int iVideoStream;
double timeBase = 0.0;
public:
Demuxer(const char* filePath) {
avformat_network_init();
TORCH_CHECK(
0 <= avformat_open_input(&fmtCtx, filePath, NULL, NULL),
"avformat_open_input() failed at line ",
__LINE__,
" in demuxer.h\n");
if (!fmtCtx) {
TORCH_CHECK(
false,
"Encountered NULL AVFormatContext at line ",
__LINE__,
" in demuxer.h\n");
}
TORCH_CHECK(
0 <= avformat_find_stream_info(fmtCtx, NULL),
"avformat_find_stream_info() failed at line ",
__LINE__,
" in demuxer.h\n");
iVideoStream =
av_find_best_stream(fmtCtx, AVMEDIA_TYPE_VIDEO, -1, -1, NULL, 0);
if (iVideoStream < 0) {
TORCH_CHECK(
false,
"av_find_best_stream() failed at line ",
__LINE__,
" in demuxer.h\n");
}
eVideoCodec = fmtCtx->streams[iVideoStream]->codecpar->codec_id;
AVRational rTimeBase = fmtCtx->streams[iVideoStream]->time_base;
timeBase = av_q2d(rTimeBase);
bMp4H264 = eVideoCodec == AV_CODEC_ID_H264 &&
(!strcmp(fmtCtx->iformat->long_name, "QuickTime / MOV") ||
!strcmp(fmtCtx->iformat->long_name, "FLV (Flash Video)") ||
!strcmp(fmtCtx->iformat->long_name, "Matroska / WebM"));
bMp4HEVC = eVideoCodec == AV_CODEC_ID_HEVC &&
(!strcmp(fmtCtx->iformat->long_name, "QuickTime / MOV") ||
!strcmp(fmtCtx->iformat->long_name, "FLV (Flash Video)") ||
!strcmp(fmtCtx->iformat->long_name, "Matroska / WebM"));
bMp4MPEG4 = eVideoCodec == AV_CODEC_ID_MPEG4 &&
(!strcmp(fmtCtx->iformat->long_name, "QuickTime / MOV") ||
!strcmp(fmtCtx->iformat->long_name, "FLV (Flash Video)") ||
!strcmp(fmtCtx->iformat->long_name, "Matroska / WebM"));
av_init_packet(&pkt);
pkt.data = NULL;
pkt.size = 0;
av_init_packet(&pktFiltered);
pktFiltered.data = NULL;
pktFiltered.size = 0;
if (bMp4H264) {
const AVBitStreamFilter* bsf = av_bsf_get_by_name("h264_mp4toannexb");
if (!bsf) {
TORCH_CHECK(
false,
"av_bsf_get_by_name() failed at line ",
__LINE__,
" in demuxer.h\n");
}
TORCH_CHECK(
0 <= av_bsf_alloc(bsf, &bsfCtx),
"av_bsf_alloc() failed at line ",
__LINE__,
" in demuxer.h\n");
avcodec_parameters_copy(
bsfCtx->par_in, fmtCtx->streams[iVideoStream]->codecpar);
TORCH_CHECK(
0 <= av_bsf_init(bsfCtx),
"av_bsf_init() failed at line ",
__LINE__,
" in demuxer.h\n");
}
if (bMp4HEVC) {
const AVBitStreamFilter* bsf = av_bsf_get_by_name("hevc_mp4toannexb");
if (!bsf) {
TORCH_CHECK(
false,
"av_bsf_get_by_name() failed at line ",
__LINE__,
" in demuxer.h\n");
}
TORCH_CHECK(
0 <= av_bsf_alloc(bsf, &bsfCtx),
"av_bsf_alloc() failed at line ",
__LINE__,
" in demuxer.h\n");
avcodec_parameters_copy(
bsfCtx->par_in, fmtCtx->streams[iVideoStream]->codecpar);
TORCH_CHECK(
0 <= av_bsf_init(bsfCtx),
"av_bsf_init() failed at line ",
__LINE__,
" in demuxer.h\n");
}
}
~Demuxer() {
if (!fmtCtx) {
return;
}
if (pkt.data) {
av_packet_unref(&pkt);
}
if (pktFiltered.data) {
av_packet_unref(&pktFiltered);
}
if (bsfCtx) {
av_bsf_free(&bsfCtx);
}
avformat_close_input(&fmtCtx);
if (dataWithHeader) {
av_free(dataWithHeader);
}
}
AVCodecID get_video_codec() {
return eVideoCodec;
}
double get_duration() const {
return (double)fmtCtx->duration / AV_TIME_BASE;
}
double get_fps() const {
return av_q2d(fmtCtx->streams[iVideoStream]->r_frame_rate);
}
bool demux(uint8_t** video, unsigned long* videoBytes) {
if (!fmtCtx) {
return false;
}
*videoBytes = 0;
if (pkt.data) {
av_packet_unref(&pkt);
}
int e = 0;
while ((e = av_read_frame(fmtCtx, &pkt)) >= 0 &&
pkt.stream_index != iVideoStream) {
av_packet_unref(&pkt);
}
if (e < 0) {
return false;
}
if (bMp4H264 || bMp4HEVC) {
if (pktFiltered.data) {
av_packet_unref(&pktFiltered);
}
TORCH_CHECK(
0 <= av_bsf_send_packet(bsfCtx, &pkt),
"av_bsf_send_packet() failed at line ",
__LINE__,
" in demuxer.h\n");
TORCH_CHECK(
0 <= av_bsf_receive_packet(bsfCtx, &pktFiltered),
"av_bsf_receive_packet() failed at line ",
__LINE__,
" in demuxer.h\n");
*video = pktFiltered.data;
*videoBytes = pktFiltered.size;
} else {
if (bMp4MPEG4 && (frameCount == 0)) {
int extraDataSize =
fmtCtx->streams[iVideoStream]->codecpar->extradata_size;
if (extraDataSize > 0) {
dataWithHeader = (uint8_t*)av_malloc(
extraDataSize + pkt.size - 3 * sizeof(uint8_t));
if (!dataWithHeader) {
TORCH_CHECK(
false,
"av_malloc() failed at line ",
__LINE__,
" in demuxer.h\n");
}
memcpy(
dataWithHeader,
fmtCtx->streams[iVideoStream]->codecpar->extradata,
extraDataSize);
memcpy(
dataWithHeader + extraDataSize,
pkt.data + 3,
pkt.size - 3 * sizeof(uint8_t));
*video = dataWithHeader;
*videoBytes = extraDataSize + pkt.size - 3 * sizeof(uint8_t);
}
} else {
*video = pkt.data;
*videoBytes = pkt.size;
}
}
frameCount++;
return true;
}
void seek(double timestamp, int flag) {
int64_t time = timestamp * AV_TIME_BASE;
TORCH_CHECK(
0 <= av_seek_frame(fmtCtx, -1, time, flag),
"av_seek_frame() failed at line ",
__LINE__,
" in demuxer.h\n");
}
};
inline cudaVideoCodec ffmpeg_to_codec(AVCodecID id) {
switch (id) {
case AV_CODEC_ID_MPEG1VIDEO:
return cudaVideoCodec_MPEG1;
case AV_CODEC_ID_MPEG2VIDEO:
return cudaVideoCodec_MPEG2;
case AV_CODEC_ID_MPEG4:
return cudaVideoCodec_MPEG4;
case AV_CODEC_ID_WMV3:
case AV_CODEC_ID_VC1:
return cudaVideoCodec_VC1;
case AV_CODEC_ID_H264:
return cudaVideoCodec_H264;
case AV_CODEC_ID_HEVC:
return cudaVideoCodec_HEVC;
case AV_CODEC_ID_VP8:
return cudaVideoCodec_VP8;
case AV_CODEC_ID_VP9:
return cudaVideoCodec_VP9;
case AV_CODEC_ID_MJPEG:
return cudaVideoCodec_JPEG;
case AV_CODEC_ID_AV1:
return cudaVideoCodec_AV1;
default:
return cudaVideoCodec_NumCodecs;
}
}
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