Aegisub/FFmpegSource/ffmpegsource.cpp
Fredrik Mellbin acc6e13022 FFmpegSource 1.7
Originally committed to SVN as r1471.
2007-08-06 15:49:57 +00:00

682 lines
22 KiB
C++

#include "ffmpegsource.h"
#include "stdiostream.c"
#include "matroskacodecs.c"
class FFMatroskaSource : public FFBase {
private:
StdIoStream ST;
unsigned int BufferSize;
CompressedStream *VideoCS;
CompressedStream *AudioCS;
AVCodecContext *VideoCodecContext;
MatroskaFile *MF;
char ErrorMessage[256];
uint8_t *Buffer;
int CurrentFrame;
int ReadFrame(uint64_t AFilePos, unsigned int AFrameSize, CompressedStream *ACS, IScriptEnvironment *Env);
int DecodeNextFrame(AVFrame *AFrame, int64_t *AFirstStartTime, IScriptEnvironment* Env);
int GetTrackIndex(int Index, unsigned char ATrackType, IScriptEnvironment *Env) {
if (Index == -1)
for (unsigned int i = 0; i < mkv_GetNumTracks(MF); i++)
if (mkv_GetTrackInfo(MF, i)->Type == ATrackType) {
Index = i;
break;
}
if (Index == -1)
Env->ThrowError("FFmpegSource: No %s track found", (ATrackType & TT_VIDEO) ? "video" : "audio");
if (Index <= -2)
return -2;
if (Index >= (int)mkv_GetNumTracks(MF))
Env->ThrowError("FFmpegSource: Invalid %s track number", (ATrackType & TT_VIDEO) ? "video" : "audio");
TrackInfo *TI = mkv_GetTrackInfo(MF, Index);
if (TI->Type != ATrackType)
Env->ThrowError("FFmpegSource: Selected track is not %s", (ATrackType & TT_VIDEO) ? "video" : "audio");
return Index;
}
public:
FFMatroskaSource(const char *ASource, int AVideoTrack, int AAudioTrack, const char *ATimecodes, bool AVCache, const char *AVideoCache, const char *AAudioCache, const char *APPString, int AQuality, IScriptEnvironment* Env) {
CurrentFrame = 0;
int VideoTrack;
int AudioTrack;
unsigned int TrackMask = ~0;
AVCodecContext *AudioCodecContext = NULL;
AVCodec *AudioCodec = NULL;
VideoCodecContext = NULL;
AVCodec *VideoCodec = NULL;
TrackInfo *VideoTI = NULL;
BufferSize = 0;
Buffer = NULL;
VideoCS = NULL;
AudioCS = NULL;
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(ASource, "rb");
if (ST.fp == NULL)
Env->ThrowError("FFmpegSource: Can't open '%s': %s", ASource, 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("FFmpegSource: Can't parse Matroska file: %s", ErrorMessage);
}
VideoTrack = GetTrackIndex(AVideoTrack, TT_VIDEO, Env);
AudioTrack = GetTrackIndex(AAudioTrack, TT_AUDIO, Env);
bool VCacheIsValid = true;
bool ACacheIsValid = true;
if (VideoTrack >= 0) {
VCacheIsValid = LoadFrameInfoFromFile(AVideoCache, ASource, VideoTrack);
VideoTI = mkv_GetTrackInfo(MF, VideoTrack);
if (VideoTI->CompEnabled) {
VideoCS = cs_Create(MF, VideoTrack, ErrorMessage, sizeof(ErrorMessage));
if (VideoCS == NULL)
Env->ThrowError("FFmpegSource: Can't create decompressor: %s", ErrorMessage);
}
VideoCodecContext = avcodec_alloc_context();
VideoCodecContext->extradata = (uint8_t *)VideoTI->CodecPrivate;
VideoCodecContext->extradata_size = VideoTI->CodecPrivateSize;
VideoCodec = avcodec_find_decoder(MatroskaToFFCodecID(VideoTI));
if (VideoCodec == NULL)
Env->ThrowError("FFmpegSource: Video codec not found");
if (avcodec_open(VideoCodecContext, VideoCodec) < 0)
Env->ThrowError("FFmpegSource: Could not open video codec");
// Fix for mpeg2 and other formats where decoding a frame is necessary to get information about the stream
if (VideoCodecContext->pix_fmt == PIX_FMT_NONE) {
mkv_SetTrackMask(MF, ~(1 << VideoTrack));
int64_t Dummy;
DecodeNextFrame(DecodeFrame, &Dummy, Env);
mkv_Seek(MF, 0, MKVF_SEEK_TO_PREV_KEYFRAME);
}
VI.image_type = VideoInfo::IT_TFF;
VI.width = VideoTI->AV.Video.PixelWidth;
VI.height = VideoTI->AV.Video.PixelHeight;
VI.fps_denominator = 1;
VI.fps_numerator = 30;
SetOutputFormat(VideoCodecContext->pix_fmt, Env);
InitPP(VI.width, VI.height, APPString, AQuality, VideoCodecContext->pix_fmt, Env);
if (!VCacheIsValid)
TrackMask &= ~(1 << VideoTrack);
}
if (AudioTrack >= 0) {
TrackInfo *AudioTI = mkv_GetTrackInfo(MF, AudioTrack);
if (AudioTI->CompEnabled) {
AudioCS = cs_Create(MF, AudioTrack, ErrorMessage, sizeof(ErrorMessage));
if (AudioCS == NULL)
Env->ThrowError("FFmpegSource: Can't create decompressor: %s", ErrorMessage);
}
AudioCodecContext = avcodec_alloc_context();
AudioCodecContext->extradata = (uint8_t *)AudioTI->CodecPrivate;
AudioCodecContext->extradata_size = AudioTI->CodecPrivateSize;
AudioCodec = avcodec_find_decoder(MatroskaToFFCodecID(AudioTI));
if (AudioCodec == NULL)
Env->ThrowError("FFmpegSource: Audio codec not found");
if (avcodec_open(AudioCodecContext, AudioCodec) < 0)
Env->ThrowError("FFmpegSource: Could not open audio codec");
// Fix for ac3 and other codecs where decoding a block of audio is required to get information about it
if (AudioCodecContext->channels == 0 || AudioCodecContext->sample_rate == 0) {
mkv_SetTrackMask(MF, ~(1 << AudioTrack));
uint64_t StartTime, EndTime, FilePos;
unsigned int Track, FrameFlags, FrameSize;
mkv_ReadFrame(MF, 0, &Track, &StartTime, &EndTime, &FilePos, &FrameSize, &FrameFlags);
uint8_t DecodingBuffer[AVCODEC_MAX_AUDIO_FRAME_SIZE];
int Size = ReadFrame(FilePos, FrameSize, AudioCS, Env);
uint8_t *Data = Buffer;
while (Size > 0) {
int TempOutputBufSize = AVCODEC_MAX_AUDIO_FRAME_SIZE;
int Ret = avcodec_decode_audio2(AudioCodecContext, (int16_t *)DecodingBuffer, &TempOutputBufSize, Data, Size);
if (Ret < 0)
Env->ThrowError("FFmpegSource: Audio decoding error");
Size -= Ret;
Data += Ret;
}
mkv_Seek(MF, 0, MKVF_SEEK_TO_PREV_KEYFRAME);
}
VI.nchannels = AudioCodecContext->channels;
VI.audio_samples_per_second = AudioCodecContext->sample_rate;
switch (AudioCodecContext->sample_fmt) {
case SAMPLE_FMT_U8: VI.sample_type = SAMPLE_INT8; break;
case SAMPLE_FMT_S16: VI.sample_type = SAMPLE_INT16; break;
case SAMPLE_FMT_S24: VI.sample_type = SAMPLE_INT24; break;
case SAMPLE_FMT_S32: VI.sample_type = SAMPLE_INT32; break;
case SAMPLE_FMT_FLT: VI.sample_type = SAMPLE_FLOAT; break;
default:
Env->ThrowError("FFmpegSource: Unsupported/unknown sample format");
}
ACacheIsValid = PrepareAudioCache(AAudioCache, ASource, AudioTrack, Env);
if (!ACacheIsValid)
TrackMask &= ~(1 << AudioTrack);
}
mkv_SetTrackMask(MF, TrackMask);
uint8_t DecodingBuffer[AVCODEC_MAX_AUDIO_FRAME_SIZE];
// Needs to be indexed?
if (!ACacheIsValid || !VCacheIsValid) {
uint64_t StartTime, EndTime, FilePos;
unsigned int Track, FrameFlags, FrameSize;
while (mkv_ReadFrame(MF, 0, &Track, &StartTime, &EndTime, &FilePos, &FrameSize, &FrameFlags) == 0)
if (Track == VideoTrack && !VCacheIsValid) {
FrameToDTS.push_back(FrameInfo(StartTime, (FrameFlags & FRAME_KF) != 0));
VI.num_frames++;
} else if (Track == AudioTrack && !ACacheIsValid) {
int Size = ReadFrame(FilePos, FrameSize, AudioCS, Env);
uint8_t *Data = Buffer;
while (Size > 0) {
int TempOutputBufSize = AVCODEC_MAX_AUDIO_FRAME_SIZE;
int Ret = avcodec_decode_audio2(AudioCodecContext, (int16_t *)DecodingBuffer, &TempOutputBufSize, Data, Size);
if (Ret < 0)
Env->ThrowError("FFmpegSource: Audio decoding error");
Size -= Ret;
Data += Ret;
VI.num_audio_samples += VI.AudioSamplesFromBytes(TempOutputBufSize);
fwrite(DecodingBuffer, 1, TempOutputBufSize, AudioCache);
}
}
if (VideoTrack >= 0 && VI.num_frames == 0)
Env->ThrowError("FFmpegSource: Video track contains no frames");
if (AudioTrack >= 0 && VI.num_audio_samples == 0)
Env->ThrowError("FFmpegSource: Audio track contains no samples");
if (VideoTrack >= 0)
mkv_Seek(MF, FrameToDTS.front().DTS, MKVF_SEEK_TO_PREV_KEYFRAME);
if (AVCache && !VCacheIsValid)
if (!SaveFrameInfoToFile(AVideoCache, ASource, VideoTrack))
Env->ThrowError("FFmpegSource: Failed to write video cache info");
}
if (AudioTrack >= 0) {
avcodec_close(AudioCodecContext);
av_free(AudioCodecContext);
}
if (VideoTrack >= 0) {
mkv_SetTrackMask(MF, ~(1 << VideoTrack));
// Calculate the average framerate
if (FrameToDTS.size() >= 2) {
double DTSDiff = (double)(FrameToDTS.back().DTS - FrameToDTS.front().DTS);
VI.fps_denominator = (unsigned int)(DTSDiff * mkv_TruncFloat(VideoTI->TimecodeScale) / (double)1000 / (double)(VI.num_frames - 1) + 0.5);
VI.fps_numerator = 1000000;
}
if (!SaveTimecodesToFile(ATimecodes, mkv_TruncFloat(VideoTI->TimecodeScale), 1000000))
Env->ThrowError("FFmpegSource: Failed to write timecodes");
}
}
~FFMatroskaSource() {
free(Buffer);
mkv_Close(MF);
fclose(ST.fp);
if (AudioCache)
fclose(AudioCache);
if (VideoCodecContext)
avcodec_close(VideoCodecContext);
av_free(VideoCodecContext);
}
PVideoFrame __stdcall GetFrame(int n, IScriptEnvironment* Env);
};
int FFMatroskaSource::ReadFrame(uint64_t AFilePos, unsigned int AFrameSize, CompressedStream *ACS, IScriptEnvironment *Env) {
if (ACS) {
char CSBuffer[4096];
unsigned int DecompressedFrameSize = 0;
cs_NextFrame(ACS, AFilePos, AFrameSize);
for (;;) {
int ReadBytes = cs_ReadData(ACS, CSBuffer, sizeof(CSBuffer));
if (ReadBytes < 0)
Env->ThrowError("FFmpegSource: Error decompressing data: %s", cs_GetLastError(ACS));
if (ReadBytes == 0) {
return DecompressedFrameSize;
}
if (BufferSize < DecompressedFrameSize + ReadBytes) {
BufferSize = AFrameSize;
Buffer = (uint8_t *)realloc(Buffer, BufferSize);
if (Buffer == NULL)
Env->ThrowError("FFmpegSource: Out of memory");
}
memcpy(Buffer + DecompressedFrameSize, CSBuffer, ReadBytes);
DecompressedFrameSize += ReadBytes;
}
} else {
if (_fseeki64(ST.fp, AFilePos, SEEK_SET))
Env->ThrowError("FFmpegSource: fseek(): %s", strerror(errno));
if (BufferSize < AFrameSize) {
BufferSize = AFrameSize;
Buffer = (uint8_t *)realloc(Buffer, BufferSize);
if (Buffer == NULL)
Env->ThrowError("FFmpegSource: Out of memory");
}
size_t ReadBytes = fread(Buffer, 1, AFrameSize, ST.fp);
if (ReadBytes != AFrameSize) {
if (ReadBytes == 0) {
if (feof(ST.fp))
Env->ThrowError("FFmpegSource: Unexpected EOF while reading frame");
else
Env->ThrowError("FFmpegSource: Error reading frame: %s", strerror(errno));
} else
Env->ThrowError("FFmpegSource: Short read while reading frame");
Env->ThrowError("FFmpegSource: Unknown read error");
}
return AFrameSize;
}
return 0;
}
int FFMatroskaSource::DecodeNextFrame(AVFrame *AFrame, int64_t *AFirstStartTime, IScriptEnvironment* Env) {
int FrameFinished = 0;
int Ret = -1;
*AFirstStartTime = -1;
uint64_t StartTime, EndTime, FilePos;
unsigned int Track, FrameFlags, FrameSize;
while (mkv_ReadFrame(MF, 0, &Track, &StartTime, &EndTime, &FilePos, &FrameSize, &FrameFlags) == 0) {
FrameSize = ReadFrame(FilePos, FrameSize, VideoCS, Env);
if (*AFirstStartTime < 0)
*AFirstStartTime = StartTime;
Ret = avcodec_decode_video(VideoCodecContext, AFrame, &FrameFinished, Buffer, FrameSize);
if (FrameFinished)
goto Done;
}
// Flush the last frame
if (CurrentFrame == VI.num_frames - 1 && VideoCodecContext->has_b_frames)
Ret = avcodec_decode_video(VideoCodecContext, AFrame, &FrameFinished, NULL, 0);
Done:
return Ret;
}
PVideoFrame __stdcall FFMatroskaSource::GetFrame(int n, IScriptEnvironment* Env) {
bool HasSeeked = false;
if (n < CurrentFrame || FindClosestKeyFrame(n) > CurrentFrame) {
mkv_Seek(MF, FrameToDTS[n].DTS, MKVF_SEEK_TO_PREV_KEYFRAME);
avcodec_flush_buffers(VideoCodecContext);
HasSeeked = true;
}
do {
int64_t StartTime;
int Ret = DecodeNextFrame(DecodeFrame, &StartTime, Env);
if (HasSeeked) {
HasSeeked = false;
if (StartTime < 0 || (CurrentFrame = FrameFromDTS(StartTime)) < 0)
Env->ThrowError("FFmpegSource: Frame accurate seeking is not possible in this file");
}
CurrentFrame++;
} while (CurrentFrame <= n);
return OutputFrame(DecodeFrame, Env);
}
class FFmpegSource : public FFBase {
private:
AVFormatContext *FormatContext;
AVCodecContext *VideoCodecContext;
int VideoTrack;
int CurrentFrame;
int SeekMode;
int DecodeNextFrame(AVFrame *Frame, int64_t *DTS);
int GetTrackIndex(int Index, CodecType ATrackType, IScriptEnvironment *Env) {
if (Index == -1)
for (unsigned int i = 0; i < FormatContext->nb_streams; i++)
if (FormatContext->streams[i]->codec->codec_type == ATrackType) {
Index = i;
break;
}
if (Index == -1)
Env->ThrowError("FFmpegSource: No %s track found", (ATrackType == CODEC_TYPE_VIDEO) ? "video" : "audio");
if (Index <= -2)
return -2;
if (Index >= (int)FormatContext->nb_streams)
Env->ThrowError("FFmpegSource: Invalid %s track number", (ATrackType == CODEC_TYPE_VIDEO) ? "video" : "audio");
if (FormatContext->streams[Index]->codec->codec_type != ATrackType)
Env->ThrowError("FFmpegSource: Selected track is not %s", (ATrackType == CODEC_TYPE_VIDEO) ? "video" : "audio");
return Index;
}
public:
FFmpegSource(const char *ASource, int AVideoTrack, int AAudioTrack, const char *ATimecodes, bool AVCache, const char *AVideoCache, const char *AAudioCache, const char *APPString, int AQuality, int ASeekMode, IScriptEnvironment* Env) {
CurrentFrame = 0;
SeekMode = ASeekMode;
AVCodecContext *AudioCodecContext = NULL;
AVCodec *AudioCodec;
AVCodec *VideoCodec;
FormatContext = NULL;
VideoCodecContext = NULL;
VideoCodec = NULL;
if (av_open_input_file(&FormatContext, ASource, NULL, 0, NULL) != 0)
Env->ThrowError("FFmpegSource: Couldn't open '%s'", ASource);
if (av_find_stream_info(FormatContext) < 0)
Env->ThrowError("FFmpegSource: Couldn't find stream information");
VideoTrack = GetTrackIndex(AVideoTrack, CODEC_TYPE_VIDEO, Env);
int AudioTrack = GetTrackIndex(AAudioTrack, CODEC_TYPE_AUDIO, Env);
bool VCacheIsValid = true;
bool ACacheIsValid = true;
if (VideoTrack >= 0) {
VCacheIsValid = LoadFrameInfoFromFile(AVideoCache, ASource, VideoTrack);
VideoCodecContext = FormatContext->streams[VideoTrack]->codec;
VideoCodec = avcodec_find_decoder(VideoCodecContext->codec_id);
if (VideoCodec == NULL)
Env->ThrowError("FFmpegSource: Video codec not found");
if (avcodec_open(VideoCodecContext, VideoCodec) < 0)
Env->ThrowError("FFmpegSource: Could not open video codec");
VI.image_type = VideoInfo::IT_TFF;
VI.width = VideoCodecContext->width;
VI.height = VideoCodecContext->height;
VI.fps_denominator = FormatContext->streams[VideoTrack]->time_base.num;
VI.fps_numerator = FormatContext->streams[VideoTrack]->time_base.den;
// sanity check framerate
if (VI.fps_denominator > VI.fps_numerator || VI.fps_denominator <= 0 || VI.fps_numerator <= 0) {
VI.fps_denominator = 1;
VI.fps_numerator = 30;
}
SetOutputFormat(VideoCodecContext->pix_fmt, Env);
InitPP(VI.width, VI.height, APPString, AQuality, VideoCodecContext->pix_fmt, Env);
}
if (AudioTrack >= 0) {
AudioCodecContext = FormatContext->streams[AudioTrack]->codec;
AudioCodec = avcodec_find_decoder(AudioCodecContext->codec_id);
if (AudioCodec == NULL)
Env->ThrowError("FFmpegSource: Audio codec not found");
if (avcodec_open(AudioCodecContext, AudioCodec) < 0)
Env->ThrowError("FFmpegSource: Could not open audio codec");
switch (AudioCodecContext->sample_fmt) {
case SAMPLE_FMT_U8: VI.sample_type = SAMPLE_INT8; break;
case SAMPLE_FMT_S16: VI.sample_type = SAMPLE_INT16; break;
case SAMPLE_FMT_S24: VI.sample_type = SAMPLE_INT24; break;
case SAMPLE_FMT_S32: VI.sample_type = SAMPLE_INT32; break;
case SAMPLE_FMT_FLT: VI.sample_type = SAMPLE_FLOAT; break;
default:
Env->ThrowError("FFmpegSource: Unsupported/unknown sample format");
}
VI.nchannels = AudioCodecContext->channels;
VI.audio_samples_per_second = AudioCodecContext->sample_rate;
ACacheIsValid = PrepareAudioCache(AAudioCache, ASource, AudioTrack, Env);
}
uint8_t DecodingBuffer[AVCODEC_MAX_AUDIO_FRAME_SIZE];
// Needs to be indexed?
if (!ACacheIsValid || !VCacheIsValid) {
AVPacket Packet;
while (av_read_frame(FormatContext, &Packet) >= 0) {
if (Packet.stream_index == VideoTrack && !VCacheIsValid) {
FrameToDTS.push_back(FrameInfo(Packet.dts, (Packet.flags & PKT_FLAG_KEY) ? 1 : 0));
VI.num_frames++;
} else if (Packet.stream_index == AudioTrack && !ACacheIsValid) {
int Size = Packet.size;
uint8_t *Data = Packet.data;
while (Size > 0) {
int TempOutputBufSize = AVCODEC_MAX_AUDIO_FRAME_SIZE;
int Ret = avcodec_decode_audio2(AudioCodecContext, (int16_t *)DecodingBuffer, &TempOutputBufSize, Data, Size);
if (Ret < 0)
Env->ThrowError("FFmpegSource: Audio decoding error");
Size -= Ret;
Data += Ret;
VI.num_audio_samples += VI.AudioSamplesFromBytes(TempOutputBufSize);
fwrite(DecodingBuffer, 1, TempOutputBufSize, AudioCache);
}
}
av_free_packet(&Packet);
}
if (VideoTrack >= 0 && VI.num_frames == 0)
Env->ThrowError("FFmpegSource: Video track contains no frames");
if (AudioTrack >= 0 && VI.num_audio_samples == 0)
Env->ThrowError("FFmpegSource: Audio track contains no samples");
if (VideoTrack >= 0)
av_seek_frame(FormatContext, VideoTrack, FrameToDTS.front().DTS, AVSEEK_FLAG_BACKWARD);
if (AVCache)
if (!SaveFrameInfoToFile(AVideoCache, ASource, VideoTrack))
Env->ThrowError("FFmpegSource: Failed to write video cache info");
}
if (AudioTrack >= 0)
avcodec_close(AudioCodecContext);
if (VideoTrack >= 0) {
if (!SaveTimecodesToFile(ATimecodes, FormatContext->streams[VideoTrack]->time_base.num * 1000, FormatContext->streams[VideoTrack]->time_base.den))
Env->ThrowError("FFmpegSource: Failed to write timecodes");
// Adjust framerate to match the duration of the first frame
if (FrameToDTS.size() >= 2) {
int64_t DTSDiff = (double)(FrameToDTS[1].DTS - FrameToDTS[0].DTS);
VI.fps_denominator *= DTSDiff;
}
}
}
~FFmpegSource() {
if (VideoTrack >= 0)
avcodec_close(VideoCodecContext);
av_close_input_file(FormatContext);
}
PVideoFrame __stdcall GetFrame(int n, IScriptEnvironment* Env);
};
int FFmpegSource::DecodeNextFrame(AVFrame *AFrame, int64_t *AStartTime) {
AVPacket Packet;
int FrameFinished = 0;
int Ret = -1;
*AStartTime = -1;
while (av_read_frame(FormatContext, &Packet) >= 0) {
if (Packet.stream_index == VideoTrack) {
Ret = avcodec_decode_video(VideoCodecContext, AFrame, &FrameFinished, Packet.data, Packet.size);
if (*AStartTime < 0)
*AStartTime = Packet.dts;
}
av_free_packet(&Packet);
if (FrameFinished)
goto Done;
}
// Flush the last frame
if (CurrentFrame == VI.num_frames - 1 && VideoCodecContext->has_b_frames)
Ret = avcodec_decode_video(VideoCodecContext, AFrame, &FrameFinished, NULL, 0);
Done:
return Ret;
}
PVideoFrame __stdcall FFmpegSource::GetFrame(int n, IScriptEnvironment* Env) {
bool HasSeeked = false;
int ClosestKF = FindClosestKeyFrame(n);
if (SeekMode == 0) {
if (n < CurrentFrame) {
av_seek_frame(FormatContext, VideoTrack, FrameToDTS.front().DTS, AVSEEK_FLAG_BACKWARD);
avcodec_flush_buffers(VideoCodecContext);
CurrentFrame = 0;
}
} else {
// 10 frames is used as a margin to prevent excessive seeking since the predicted best keyframe isn't always selected by avformat
if (n < CurrentFrame || ClosestKF > CurrentFrame + 10 || (SeekMode == 3 && n > CurrentFrame + 10)) {
av_seek_frame(FormatContext, VideoTrack, (SeekMode == 3) ? FrameToDTS[n].DTS : FrameToDTS[ClosestKF].DTS, AVSEEK_FLAG_BACKWARD);
avcodec_flush_buffers(VideoCodecContext);
HasSeeked = true;
}
}
do {
int64_t StartTime;
DecodeNextFrame(DecodeFrame, &StartTime);
if (HasSeeked) {
HasSeeked = false;
// Is the seek destination time known? Does it belong to a frame?
if (StartTime < 0 || (CurrentFrame = FrameFromDTS(StartTime)) < 0) {
switch (SeekMode) {
case 1:
Env->ThrowError("FFmpegSource: Frame accurate seeking is not possible in this file");
case 2:
case 3:
CurrentFrame = ClosestFrameFromDTS(StartTime);
break;
default:
Env->ThrowError("FFmpegSource: Failed assertion");
}
}
}
CurrentFrame++;
} while (CurrentFrame <= n);
return OutputFrame(DecodeFrame, Env);
}
AVSValue __cdecl CreateFFmpegSource(AVSValue Args, void* UserData, IScriptEnvironment* Env) {
if (!UserData) {
av_register_all();
UserData = (void *)-1;
}
if (!Args[0].Defined())
Env->ThrowError("FFmpegSource: No source specified");
const char *Source = Args[0].AsString();
int VTrack = Args[1].AsInt(-1);
int ATrack = Args[2].AsInt(-2);
const char *Timecodes = Args[3].AsString("");
bool VCache = Args[4].AsBool(true);
const char *VCacheFile = Args[5].AsString("");
const char *ACacheFile = Args[6].AsString("");
const char *PPString = Args[7].AsString("");
int PPQuality = Args[8].AsInt(PP_QUALITY_MAX);
int SeekMode = Args[9].AsInt(1);
if (VTrack <= -2 && ATrack <= -2)
Env->ThrowError("FFmpegSource: No tracks selected");
AVFormatContext *FormatContext;
if (av_open_input_file(&FormatContext, Source, NULL, 0, NULL) != 0)
Env->ThrowError("FFmpegSource: Couldn't open %s", Args[0].AsString());
bool IsMatroska = !strcmp(FormatContext->iformat->name, "matroska");
av_close_input_file(FormatContext);
if (IsMatroska)
return new FFMatroskaSource(Source, VTrack, ATrack, Timecodes, VCache, VCacheFile, ACacheFile, PPString, PPQuality, Env);
else
return new FFmpegSource(Source, VTrack, ATrack, Timecodes, VCache, VCacheFile, ACacheFile, PPString, PPQuality, SeekMode, Env);
}
AVSValue __cdecl CreateFFPP(AVSValue Args, void* UserData, IScriptEnvironment* Env) {
return new FFPP(Args[0].AsClip(), Args[1].AsString(""), Args[2].AsInt(PP_QUALITY_MAX), Env);
}
extern "C" __declspec(dllexport) const char* __stdcall AvisynthPluginInit2(IScriptEnvironment* Env) {
Env->AddFunction("FFmpegSource", "[source]s[vtrack]i[atrack]i[timecodes]s[vcache]b[vcachefile]s[acachefile]s[pp]s[ppquality]i[seekmode]i", CreateFFmpegSource, 0);
Env->AddFunction("FFPP", "c[pp]s[ppquality]i", CreateFFPP, 0);
return "FFmpegSource";
};