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Aegisub/FFmpegSource/ffmpegsource.cpp

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#include <windows.h>
#include <stdio.h>
#include <map>
#include <vector>
#include <assert.h>
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <fcntl.h>
#include <io.h>
extern "C" {
#include <ffmpeg\avformat.h>
#include <ffmpeg\avcodec.h>
#include <ffmpeg\swscale.h>
}
#include "MatroskaParser.h"
#include "avisynth.h"
#include "stdiostream.cpp"
class FFBase : public IClip {
private:
SwsContext *SWS;
int ConvertToFormat;
int ConvertFromFormat;
protected:
VideoInfo VI;
void SetOutputFormat(int CurrentFormat, IScriptEnvironment *Env) {
int Loss;
int BestFormat = avcodec_find_best_pix_fmt((1 << PIX_FMT_YUV420P) | (1 << PIX_FMT_YUYV422) | (1 << PIX_FMT_RGB32) | (1 << PIX_FMT_BGR24), CurrentFormat, 1, &Loss);
switch (BestFormat) {
case PIX_FMT_YUV420P: VI.pixel_type = VideoInfo::CS_I420; break;
case PIX_FMT_YUYV422: VI.pixel_type = VideoInfo::CS_YUY2; break;
case PIX_FMT_RGB32: VI.pixel_type = VideoInfo::CS_BGR32; break;
case PIX_FMT_BGR24: VI.pixel_type = VideoInfo::CS_BGR24; break;
default:
Env->ThrowError("FFmpegSource: No suitable output format found");
}
if (BestFormat != CurrentFormat) {
ConvertFromFormat = CurrentFormat;
ConvertToFormat = BestFormat;
SWS = sws_getContext(VI.width, VI.height, ConvertFromFormat, VI.width, VI.height, ConvertToFormat, SWS_LANCZOS, NULL, NULL, NULL);
}
}
PVideoFrame OutputFrame(AVFrame *Frame, IScriptEnvironment *Env) {
PVideoFrame Dst = Env->NewVideoFrame(VI);
if (ConvertToFormat != PIX_FMT_NONE && VI.pixel_type == VideoInfo::CS_I420) {
uint8_t *DstData[3] = {Dst->GetWritePtr(PLANAR_Y), Dst->GetWritePtr(PLANAR_U), Dst->GetWritePtr(PLANAR_V)};
int DstStride[3] = {Dst->GetPitch(PLANAR_Y), Dst->GetPitch(PLANAR_U), Dst->GetPitch(PLANAR_V)};
sws_scale(SWS, Frame->data, Frame->linesize, 0, VI.height, DstData, DstStride);
} else if (ConvertToFormat != PIX_FMT_NONE) {
if (VI.IsRGB()) {
uint8_t *DstData[1] = {Dst->GetWritePtr() + Dst->GetPitch() * (Dst->GetHeight() - 1)};
int DstStride[1] = {-Dst->GetPitch()};
sws_scale(SWS, Frame->data, Frame->linesize, 0, VI.height, DstData, DstStride);
} else {
uint8_t *DstData[1] = {Dst->GetWritePtr()};
int DstStride[1] = {Dst->GetPitch()};
sws_scale(SWS, Frame->data, Frame->linesize, 0, VI.height, DstData, DstStride);
}
} else if (VI.pixel_type == VideoInfo::CS_I420) {
Env->BitBlt(Dst->GetWritePtr(PLANAR_Y), Dst->GetPitch(PLANAR_Y), Frame->data[0], Frame->linesize[0], Dst->GetRowSize(PLANAR_Y), Dst->GetHeight(PLANAR_Y));
Env->BitBlt(Dst->GetWritePtr(PLANAR_U), Dst->GetPitch(PLANAR_U), Frame->data[1], Frame->linesize[1], Dst->GetRowSize(PLANAR_U), Dst->GetHeight(PLANAR_U));
Env->BitBlt(Dst->GetWritePtr(PLANAR_V), Dst->GetPitch(PLANAR_V), Frame->data[2], Frame->linesize[2], Dst->GetRowSize(PLANAR_V), Dst->GetHeight(PLANAR_V));
} else {
if (VI.IsRGB())
Env->BitBlt(Dst->GetWritePtr() + Dst->GetPitch() * (Dst->GetHeight() - 1), -Dst->GetPitch(), Frame->data[0], Frame->linesize[0], Dst->GetRowSize(), Dst->GetHeight());
else
Env->BitBlt(Dst->GetWritePtr(), Dst->GetPitch(), Frame->data[0], Frame->linesize[0], Dst->GetRowSize(), Dst->GetHeight());
}
return Dst;
}
public:
virtual bool __stdcall GetParity(int n) { return 0; }
virtual void __stdcall GetAudio(void* buf, __int64 start, __int64 count, IScriptEnvironment* env) { }
virtual void __stdcall SetCacheHints(int cachehints, int frame_range) { }
virtual const VideoInfo& __stdcall GetVideoInfo() { return VI; }
FFBase() {
SWS = NULL;
ConvertToFormat = PIX_FMT_NONE;
ConvertFromFormat = PIX_FMT_NONE;
memset(&VI, 0, sizeof(VI));
}
};
class FFMKVSource : public FFBase {
private:
AVCodecContext CodecContext;
AVCodec *Codec;
AVFrame *Frame;
int CurrentFrame;
struct FFMKVFrameInfo {
ulonglong DTS;
bool KeyFrame;
};
std::vector<FFMKVFrameInfo> FrameToDTS;
std::map<ulonglong, int> DTSToFrame;
StdIoStream ST;
MatroskaFile *MF;
char ErrorMessage[256];
unsigned int BufferSize;
void *Buffer;
CompressedStream *CS;
int ReadNextFrame(AVFrame *Frame, ulonglong *StartTime, IScriptEnvironment* Env);
CodecID MatroskaToFFCodecID(TrackInfo *TI) {
char *Codec = TI->CodecID;
// fourcc list from ffdshow
if (!strcmp(Codec, "V_MS/VFW/FOURCC")) {
switch (((BITMAPINFOHEADER *)TI->CodecPrivate)->biCompression) {
case MAKEFOURCC('F', 'F', 'D', 'S'):
case MAKEFOURCC('F', 'V', 'F', 'W'):
case MAKEFOURCC('X', 'V', 'I', 'D'):
case MAKEFOURCC('D', 'I', 'V', 'X'):
case MAKEFOURCC('D', 'X', '5', '0'):
case MAKEFOURCC('M', 'P', '4', 'V'):
case MAKEFOURCC('3', 'I', 'V', 'X'):
case MAKEFOURCC('W', 'V', '1', 'F'):
case MAKEFOURCC('F', 'M', 'P', '4'):
case MAKEFOURCC('S', 'M', 'P', '4'):
return CODEC_ID_MPEG4;
case MAKEFOURCC('D', 'I', 'V', '3'):
case MAKEFOURCC('D', 'V', 'X', '3'):
case MAKEFOURCC('M', 'P', '4', '3'):
return CODEC_ID_MSMPEG4V3;
case MAKEFOURCC('M', 'P', '4', '2'):
return CODEC_ID_MSMPEG4V2;
case MAKEFOURCC('M', 'P', '4', '1'):
return CODEC_ID_MSMPEG4V1;
case MAKEFOURCC('W', 'M', 'V', '1'):
return CODEC_ID_WMV1;
case MAKEFOURCC('W', 'M', 'V', '2'):
return CODEC_ID_WMV2;
case MAKEFOURCC('W', 'M', 'V', '3'):
return CODEC_ID_WMV3;
/*
case MAKEFOURCC('M', 'S', 'S', '1'):
case MAKEFOURCC('M', 'S', 'S', '2'):
case MAKEFOURCC('W', 'V', 'P', '2'):
case MAKEFOURCC('W', 'M', 'V', 'P'):
return CODEC_ID_WMV9_LIB;
*/
case MAKEFOURCC('W', 'V', 'C', '1'):
return CODEC_ID_VC1;
case MAKEFOURCC('V', 'P', '5', '0'):
return CODEC_ID_VP5;
case MAKEFOURCC('V', 'P', '6', '0'):
case MAKEFOURCC('V', 'P', '6', '1'):
case MAKEFOURCC('V', 'P', '6', '2'):
return CODEC_ID_VP6;
case MAKEFOURCC('V', 'P', '6', 'F'):
case MAKEFOURCC('F', 'L', 'V', '4'):
return CODEC_ID_VP6F;
case MAKEFOURCC('C', 'A', 'V', 'S'):
return CODEC_ID_CAVS;
case MAKEFOURCC('M', 'P', 'G', '1'):
case MAKEFOURCC('M', 'P', 'E', 'G'):
return CODEC_ID_MPEG2VIDEO; // not a typo
case MAKEFOURCC('M', 'P', 'G', '2'):
case MAKEFOURCC('E', 'M', '2', 'V'):
case MAKEFOURCC('M', 'M', 'E', 'S'):
return CODEC_ID_MPEG2VIDEO;
case MAKEFOURCC('H', '2', '6', '3'):
case MAKEFOURCC('S', '2', '6', '3'):
case MAKEFOURCC('L', '2', '6', '3'):
case MAKEFOURCC('M', '2', '6', '3'):
case MAKEFOURCC('U', '2', '6', '3'):
case MAKEFOURCC('X', '2', '6', '3'):
return CODEC_ID_H263;
case MAKEFOURCC('H', '2', '6', '4'):
case MAKEFOURCC('X', '2', '6', '4'):
case MAKEFOURCC('V', 'S', 'S', 'H'):
case MAKEFOURCC('D', 'A', 'V', 'C'):
case MAKEFOURCC('P', 'A', 'V', 'C'):
case MAKEFOURCC('A', 'V', 'C', '1'):
return CODEC_ID_H264;
case MAKEFOURCC('M', 'J', 'P', 'G'):
case MAKEFOURCC('L', 'J', 'P', 'G'):
case MAKEFOURCC('M', 'J', 'L', 'S'):
case MAKEFOURCC('J', 'P', 'E', 'G'): // questionable fourcc?
case MAKEFOURCC('A', 'V', 'R', 'N'):
case MAKEFOURCC('M', 'J', 'P', 'A'):
return CODEC_ID_MJPEG;
case MAKEFOURCC('D', 'V', 'S', 'D'):
case MAKEFOURCC('D', 'V', '2', '5'):
case MAKEFOURCC('D', 'V', '5', '0'):
case MAKEFOURCC('C', 'D', 'V', 'C'):
case MAKEFOURCC('C', 'D', 'V', '5'):
case MAKEFOURCC('D', 'V', 'I', 'S'):
case MAKEFOURCC('P', 'D', 'V', 'C'):
return CODEC_ID_DVVIDEO;
case MAKEFOURCC('H', 'F', 'Y', 'U'):
case MAKEFOURCC('F', 'F', 'V', 'H'):
return CODEC_ID_HUFFYUV;
case MAKEFOURCC('C', 'Y', 'U', 'V'):
return CODEC_ID_CYUV;
case MAKEFOURCC('A', 'S', 'V', '1'):
return CODEC_ID_ASV1;
case MAKEFOURCC('A', 'S', 'V', '2'):
return CODEC_ID_ASV2;
case MAKEFOURCC('V', 'C', 'R', '1'):
return CODEC_ID_VCR1;
case MAKEFOURCC('T', 'H', 'E', 'O'):
return CODEC_ID_THEORA;
case MAKEFOURCC('S', 'V', 'Q', '1'):
return CODEC_ID_SVQ1;
case MAKEFOURCC('S', 'V', 'Q', '3'):
return CODEC_ID_SVQ3;
case MAKEFOURCC('R', 'P', 'Z', 'A'):
return CODEC_ID_RPZA;
case MAKEFOURCC('F', 'F', 'V', '1'):
return CODEC_ID_FFV1;
case MAKEFOURCC('V', 'P', '3', '1'):
return CODEC_ID_VP3;
case MAKEFOURCC('R', 'L', 'E', '8'):
return CODEC_ID_MSRLE;
case MAKEFOURCC('M', 'S', 'Z', 'H'):
return CODEC_ID_MSZH;
case MAKEFOURCC('Z', 'L', 'I', 'B'):
return CODEC_ID_FLV1;
case MAKEFOURCC('F', 'L', 'V', '1'):
return CODEC_ID_ZLIB;
/*
case MAKEFOURCC('P', 'N', 'G', '1'):
return CODEC_ID_COREPNG;
*/
case MAKEFOURCC('M', 'P', 'N', 'G'):
return CODEC_ID_PNG;
/*
case MAKEFOURCC('A', 'V', 'I', 'S'):
return CODEC_ID_AVISYNTH;
*/
case MAKEFOURCC('C', 'R', 'A', 'M'):
return CODEC_ID_MSVIDEO1;
case MAKEFOURCC('R', 'T', '2', '1'):
return CODEC_ID_INDEO2;
case MAKEFOURCC('I', 'V', '3', '2'):
case MAKEFOURCC('I', 'V', '3', '1'):
return CODEC_ID_INDEO3;
case MAKEFOURCC('C', 'V', 'I', 'D'):
return CODEC_ID_CINEPAK;
case MAKEFOURCC('R', 'V', '1', '0'):
return CODEC_ID_RV10;
case MAKEFOURCC('R', 'V', '2', '0'):
return CODEC_ID_RV20;
case MAKEFOURCC('8', 'B', 'P', 'S'):
return CODEC_ID_8BPS;
case MAKEFOURCC('Q', 'R', 'L', 'E'):
return CODEC_ID_QTRLE;
case MAKEFOURCC('D', 'U', 'C', 'K'):
return CODEC_ID_TRUEMOTION1;
case MAKEFOURCC('T', 'M', '2', '0'):
return CODEC_ID_TRUEMOTION2;
case MAKEFOURCC('T', 'S', 'C', 'C'):
return CODEC_ID_TSCC;
case MAKEFOURCC('S', 'N', 'O', 'W'):
return CODEC_ID_SNOW;
case MAKEFOURCC('Q', 'P', 'E', 'G'):
case MAKEFOURCC('Q', '1', '_', '0'):
case MAKEFOURCC('Q', '1', '_', '1'):
return CODEC_ID_QPEG;
case MAKEFOURCC('H', '2', '6', '1'):
case MAKEFOURCC('M', '2', '6', '1'):
return CODEC_ID_H261;
case MAKEFOURCC('L', 'O', 'C', 'O'):
return CODEC_ID_LOCO;
case MAKEFOURCC('W', 'N', 'V', '1'):
return CODEC_ID_WNV1;
case MAKEFOURCC('C', 'S', 'C', 'D'):
return CODEC_ID_CSCD;
case MAKEFOURCC('Z', 'M', 'B', 'V'):
return CODEC_ID_ZMBV;
case MAKEFOURCC('U', 'L', 'T', 'I'):
return CODEC_ID_ULTI;
case MAKEFOURCC('V', 'I', 'X', 'L'):
return CODEC_ID_VIXL;
case MAKEFOURCC('A', 'A', 'S', 'C'):
return CODEC_ID_AASC;
case MAKEFOURCC('F', 'P', 'S', '1'):
return CODEC_ID_FRAPS;
default:
return CODEC_ID_NONE;
}
} else if (!strcmp(Codec, "V_MPEG4/ISO/AVC"))
return CODEC_ID_H264;
else if (!strcmp(Codec, "V_MPEG4/ISO/ASP"))
return CODEC_ID_MPEG4;
else if (!strcmp(Codec, "V_MPEG2"))
return CODEC_ID_MPEG2VIDEO;
else if (!strcmp(Codec, "V_MPEG1"))
return CODEC_ID_MPEG2VIDEO; // still not a typo
else if (!strcmp(Codec, "V_SNOW"))
return CODEC_ID_SNOW;
else if (!strcmp(Codec, "V_THEORA"))
return CODEC_ID_THEORA;
else if (!strncmp(Codec, "V_REAL/RV", 9)) {
switch (Codec[9]) {
case '1':
return CODEC_ID_RV10;
case '2':
return CODEC_ID_RV20;
case '3':
return CODEC_ID_RV30;
case '4':
return CODEC_ID_RV40;
default:
return CODEC_ID_NONE;
}
} else
return CODEC_ID_NONE;
}
public:
FFMKVSource(const char *Source, int Track, IScriptEnvironment* Env) {
BufferSize = 0;
Buffer = NULL;
Frame = NULL;
CS = NULL;
CurrentFrame = 0;
memset(&ST,0,sizeof(ST));
ST.base.read = (int (__cdecl *)(InputStream *,ulonglong,void *,int))StdIoRead;
ST.base.scan = (longlong (__cdecl *)(InputStream *,ulonglong,unsigned int))StdIoScan;
ST.base.getcachesize = (unsigned int (__cdecl *)(InputStream *))StdIoGetCacheSize;
ST.base.geterror = (const char *(__cdecl *)(InputStream *))StdIoGetLastError;
ST.base.memalloc = (void *(__cdecl *)(InputStream *,size_t))StdIoMalloc;
ST.base.memrealloc = (void *(__cdecl *)(InputStream *,void *,size_t))StdIoRealloc;
ST.base.memfree = (void (__cdecl *)(InputStream *,void *)) StdIoFree;
ST.base.progress = (int (__cdecl *)(InputStream *,ulonglong,ulonglong))StdIoProgress;
ST.fp = fopen(Source ,"rb");
if (ST.fp == NULL)
Env->ThrowError("Can't open '%s': %s\n", Source, strerror(errno));
setvbuf(ST.fp, NULL, _IOFBF, CACHESIZE);
MF = mkv_OpenEx(&ST.base, 0, 0, ErrorMessage, sizeof(ErrorMessage));
if (MF == NULL) {
fclose(ST.fp);
Env->ThrowError("Can't parse Matroska file: %s\n", ErrorMessage);
}
if (Track < 0)
for (unsigned int i = 0; i < mkv_GetNumTracks(MF); i++)
if (mkv_GetTrackInfo(MF, i)->Type == TT_VIDEO) {
Track = i;
break;
}
if (Track < 0)
Env->ThrowError("No video track found");
if ((unsigned)Track >= mkv_GetNumTracks(MF))
Env->ThrowError("Invalid track number: %d\n", Track);
TrackInfo *TI = mkv_GetTrackInfo(MF, Track);
if (TI->Type != TT_VIDEO)
Env->ThrowError("Selected track is not video");
mkv_SetTrackMask(MF, ~(1 << Track));
if (TI->CompEnabled) {
CS = cs_Create(MF, Track, ErrorMessage, sizeof(ErrorMessage));
if (CS == NULL)
Env->ThrowError("Can't create decompressor: %s\n", ErrorMessage);
}
avcodec_get_context_defaults(&CodecContext);
CodecContext.extradata = (uint8_t *)TI->CodecPrivate;
CodecContext.extradata_size = TI->CodecPrivateSize;
Codec = avcodec_find_decoder(MatroskaToFFCodecID(TI));
if(Codec == NULL)
Env->ThrowError("Codec not found");
if(avcodec_open(&CodecContext, Codec) < 0)
Env->ThrowError("Could not open codec");
VI.image_type = VideoInfo::IT_TFF;
VI.width = TI->AV.Video.PixelWidth;
VI.height = TI->AV.Video.PixelHeight;
VI.fps_denominator = 1;
VI.fps_numerator = 30;
SetOutputFormat(CodecContext.pix_fmt, Env);
unsigned TrackNumber, FrameSize, FrameFlags;
ulonglong StartTime, EndTime, FilePos;
while (mkv_ReadFrame(MF, 0, &TrackNumber, &StartTime, &EndTime, &FilePos, &FrameSize, &FrameFlags) == 0) {
FFMKVFrameInfo FI;
FI.DTS = StartTime;
FI.KeyFrame = (FrameFlags & FRAME_KF) != 0;
FrameToDTS.push_back(FI);
DTSToFrame[StartTime] = VI.num_frames;
VI.num_frames++;
}
Frame = avcodec_alloc_frame();
mkv_Seek(MF, FrameToDTS[0].DTS, MKVF_SEEK_TO_PREV_KEYFRAME);
}
~FFMKVSource() {
free(Buffer);
mkv_Close(MF);
fclose(ST.fp);
av_free(Frame);
avcodec_close(&CodecContext);
}
PVideoFrame __stdcall GetFrame(int n, IScriptEnvironment* Env);
};
int FFMKVSource::ReadNextFrame(AVFrame *Frame, ulonglong *StartTime, IScriptEnvironment* Env) {
unsigned TrackNumber, FrameFlags, FrameSize;
ulonglong EndTime, FilePos, StartTime2;
*StartTime = -1;
int FrameFinished = 0;
int Ret = -1;
while (mkv_ReadFrame(MF, 0, &TrackNumber, &StartTime2, &EndTime, &FilePos, &FrameSize, &FrameFlags) == 0) {
if ((longlong)*StartTime < 0)
*StartTime = StartTime2;
if (CS) {
char CSBuffer[1024];
cs_NextFrame(CS, FilePos, FrameSize);
for (;;) {
int ReadBytes = cs_ReadData(CS, CSBuffer, sizeof(CSBuffer));
if (ReadBytes < 0)
Env->ThrowError("Error decompressing data: %s\n", cs_GetLastError(CS));
if (ReadBytes == 0)
break;
Ret = avcodec_decode_video(&CodecContext, Frame, &FrameFinished, (uint8_t *)CSBuffer, ReadBytes);
if (FrameFinished)
goto Done;
}
} else {
size_t ReadBytes;
if (fseek(ST.fp, FilePos, SEEK_SET))
Env->ThrowError("fseek(): %s\n", strerror(errno));
if (BufferSize < FrameSize) {
BufferSize = FrameSize;
Buffer = realloc(Buffer, BufferSize);
if (Buffer == NULL)
Env->ThrowError("Out of memory\n");
}
ReadBytes = fread(Buffer, 1, FrameSize, ST.fp);
if (ReadBytes != FrameSize) {
if (ReadBytes == 0) {
if (feof(ST.fp))
fprintf(stderr, "Unexpected EOF while reading frame\n");
else
fprintf(stderr, "Error reading frame: %s\n", strerror(errno));
} else
fprintf(stderr,"Short read while reading frame\n");
goto Done;
}
Ret = avcodec_decode_video(&CodecContext, Frame, &FrameFinished, (uint8_t *)Buffer, FrameSize);
if (FrameFinished)
goto Done;
}
}
Done:
return Ret;
}
PVideoFrame __stdcall FFMKVSource::GetFrame(int n, IScriptEnvironment* Env) {
bool HasSeeked = false;
bool HasBiggerKF = false;
for (int i = CurrentFrame + 1; i <= n; i++)
if (FrameToDTS[i].KeyFrame) {
HasBiggerKF = true;
break;
}
if (n < CurrentFrame || HasBiggerKF) {
mkv_Seek(MF, FrameToDTS[n].DTS, MKVF_SEEK_TO_PREV_KEYFRAME);
avcodec_flush_buffers(&CodecContext);
HasSeeked = true;
}
do {
ulonglong StartTime;
int Ret = ReadNextFrame(Frame, &StartTime, Env);
if (HasSeeked) {
CurrentFrame = DTSToFrame[StartTime];
HasSeeked = false;
}
CurrentFrame++;
} while (CurrentFrame <= n);
return OutputFrame(Frame, Env);
}
class FFmpegSource : public FFBase {
private:
AVFormatContext *FormatContext;
AVCodecContext *CodecContext;
AVCodec *Codec;
AVFrame *Frame;
int Track;
int CurrentFrame;
std::vector<int64_t> FrameToDTS;
std::map<int64_t, int> DTSToFrame;
bool ForceSeek;
int ReadNextFrame(AVFrame *Frame, int64_t *DTS);
public:
FFmpegSource(const char *Source, int _Track, bool _ForceSeek, IScriptEnvironment* Env) : Track(_Track), ForceSeek(_ForceSeek) {
CurrentFrame = 0;
if(av_open_input_file(&FormatContext, Source, NULL, 0, NULL) != 0)
Env->ThrowError("Couldn't open \"%s\"", Source);
if(av_find_stream_info(FormatContext) < 0)
Env->ThrowError("Couldn't find stream information");
if (Track >= (int)FormatContext->nb_streams)
Env->ThrowError("Invalid track number");
if (Track < 0)
for(unsigned int i = 0; i < FormatContext->nb_streams; i++)
if(FormatContext->streams[i]->codec->codec_type == CODEC_TYPE_VIDEO) {
Track = i;
break;
}
if(Track < -1)
Env->ThrowError("Couldn't find a video stream");
if (FormatContext->streams[Track]->codec->codec_type != CODEC_TYPE_VIDEO)
Env->ThrowError("Selected stream doesn't contain video");
CodecContext = FormatContext->streams[Track]->codec;
Codec = avcodec_find_decoder(CodecContext->codec_id);
if(Codec == NULL)
Env->ThrowError("Codec not found");
if(avcodec_open(CodecContext, Codec) < 0)
Env->ThrowError("Could not open codec");
VI.image_type = VideoInfo::IT_TFF;
VI.width = CodecContext->width;
VI.height = CodecContext->height;
VI.fps_denominator = CodecContext->time_base.num * 1000;
VI.fps_numerator = CodecContext->time_base.den;
// sanity check framerate
if (VI.fps_numerator < VI.fps_denominator || CodecContext->time_base.num <= 0 || CodecContext->time_base.den <= 0) {
VI.fps_denominator = 1;
VI.fps_numerator = 30;
}
SetOutputFormat(CodecContext->pix_fmt, Env);
AVPacket Packet;
while (av_read_frame(FormatContext, &Packet) >= 0) {
if (Packet.stream_index == Track) {
FrameToDTS.push_back(Packet.dts);
DTSToFrame[Packet.dts] = VI.num_frames;
VI.num_frames++;
}
av_free_packet(&Packet);
}
Frame = avcodec_alloc_frame();
av_seek_frame(FormatContext, Track, 0, AVSEEK_FLAG_BACKWARD);
}
~FFmpegSource() {
av_free(Frame);
avcodec_close(CodecContext);
av_close_input_file(FormatContext);
}
PVideoFrame __stdcall GetFrame(int n, IScriptEnvironment* Env);
};
int FFmpegSource::ReadNextFrame(AVFrame *Frame, int64_t *DTS) {
AVPacket Packet;
int FrameFinished = 0;
int Ret = -1;
*DTS = -1;
while (av_read_frame(FormatContext, &Packet) >= 0) {
if (Packet.stream_index == Track) {
Ret = avcodec_decode_video(CodecContext, Frame, &FrameFinished, Packet.data, Packet.size);
if (*DTS < 0)
*DTS = Packet.dts;
}
av_free_packet(&Packet);
if (FrameFinished)
break;
}
return Ret;
}
PVideoFrame __stdcall FFmpegSource::GetFrame(int n, IScriptEnvironment* Env) {
bool HasSeeked = false;
int IndexPosition = av_index_search_timestamp(FormatContext->streams[Track], FrameToDTS[n], AVSEEK_FLAG_BACKWARD);
int64_t NearestIndexDTS = -1;
if (IndexPosition >= 0)
NearestIndexDTS = FormatContext->streams[Track]->index_entries[IndexPosition].timestamp;
if (n < CurrentFrame || NearestIndexDTS > FrameToDTS[CurrentFrame] || (ForceSeek && IndexPosition == -1 && n > CurrentFrame + 10)) {
av_seek_frame(FormatContext, Track, FrameToDTS[n], AVSEEK_FLAG_BACKWARD);
avcodec_flush_buffers(CodecContext);
HasSeeked = true;
}
do {
int64_t DTS;
int Ret = ReadNextFrame(Frame, &DTS);
if (HasSeeked) {
CurrentFrame = DTSToFrame[DTS];
HasSeeked = DTS < 0;
}
CurrentFrame++;
} while (CurrentFrame <= n || HasSeeked);
return OutputFrame(Frame, Env);
}
AVSValue __cdecl CreateFFmpegSource(AVSValue Args, void* UserData, IScriptEnvironment* Env) {
if (!Args[0].Defined())
Env->ThrowError("No source specified");
av_register_all();
AVFormatContext *FormatContext;
if (av_open_input_file(&FormatContext, Args[0].AsString(), NULL, 0, NULL) != 0)
Env->ThrowError("Couldn't open \"%s\"", Args[0].AsString());
bool IsMatroska = !strcmp(FormatContext->iformat->name, "matroska");
av_close_input_file(FormatContext);
if (IsMatroska)
return new FFMKVSource(Args[0].AsString(), Args[1].AsInt(-1), Env);
else
return new FFmpegSource(Args[0].AsString(), Args[1].AsInt(-1), Args[2].AsBool(false), Env);
}
extern "C" __declspec(dllexport) const char* __stdcall AvisynthPluginInit2(IScriptEnvironment* Env) {
Env->AddFunction("FFmpegSource", "[source]s[track]i[forceseek]b", CreateFFmpegSource, 0);
return "FFmpegSource";
};
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