forked from mia/Aegisub
682 lines
22 KiB
C++
682 lines
22 KiB
C++
#include "ffmpegsource.h"
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#include "stdiostream.c"
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#include "matroskacodecs.c"
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class FFMatroskaSource : public FFBase {
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private:
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StdIoStream ST;
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unsigned int BufferSize;
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CompressedStream *VideoCS;
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CompressedStream *AudioCS;
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AVCodecContext *VideoCodecContext;
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MatroskaFile *MF;
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char ErrorMessage[256];
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uint8_t *Buffer;
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int CurrentFrame;
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int ReadFrame(uint64_t AFilePos, unsigned int AFrameSize, CompressedStream *ACS, IScriptEnvironment *Env);
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int DecodeNextFrame(AVFrame *AFrame, int64_t *AFirstStartTime, IScriptEnvironment* Env);
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int GetTrackIndex(int Index, unsigned char ATrackType, IScriptEnvironment *Env) {
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if (Index == -1)
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for (unsigned int i = 0; i < mkv_GetNumTracks(MF); i++)
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if (mkv_GetTrackInfo(MF, i)->Type == ATrackType) {
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Index = i;
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break;
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}
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if (Index == -1)
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Env->ThrowError("FFmpegSource: No %s track found", (ATrackType & TT_VIDEO) ? "video" : "audio");
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if (Index <= -2)
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return -2;
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if (Index >= (int)mkv_GetNumTracks(MF))
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Env->ThrowError("FFmpegSource: Invalid %s track number", (ATrackType & TT_VIDEO) ? "video" : "audio");
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TrackInfo *TI = mkv_GetTrackInfo(MF, Index);
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if (TI->Type != ATrackType)
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Env->ThrowError("FFmpegSource: Selected track is not %s", (ATrackType & TT_VIDEO) ? "video" : "audio");
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return Index;
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}
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public:
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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) {
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CurrentFrame = 0;
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int VideoTrack;
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int AudioTrack;
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unsigned int TrackMask = ~0;
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AVCodecContext *AudioCodecContext = NULL;
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AVCodec *AudioCodec = NULL;
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VideoCodecContext = NULL;
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AVCodec *VideoCodec = NULL;
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TrackInfo *VideoTI = NULL;
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BufferSize = 0;
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Buffer = NULL;
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VideoCS = NULL;
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AudioCS = NULL;
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memset(&ST,0,sizeof(ST));
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ST.base.read = (int (__cdecl *)(InputStream *,ulonglong,void *,int))StdIoRead;
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ST.base.scan = (longlong (__cdecl *)(InputStream *,ulonglong,unsigned int))StdIoScan;
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ST.base.getcachesize = (unsigned int (__cdecl *)(InputStream *))StdIoGetCacheSize;
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ST.base.geterror = (const char *(__cdecl *)(InputStream *))StdIoGetLastError;
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ST.base.memalloc = (void *(__cdecl *)(InputStream *,size_t))StdIoMalloc;
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ST.base.memrealloc = (void *(__cdecl *)(InputStream *,void *,size_t))StdIoRealloc;
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ST.base.memfree = (void (__cdecl *)(InputStream *,void *)) StdIoFree;
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ST.base.progress = (int (__cdecl *)(InputStream *,ulonglong,ulonglong))StdIoProgress;
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ST.fp = fopen(ASource, "rb");
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if (ST.fp == NULL)
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Env->ThrowError("FFmpegSource: Can't open '%s': %s", ASource, strerror(errno));
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setvbuf(ST.fp, NULL, _IOFBF, CACHESIZE);
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MF = mkv_OpenEx(&ST.base, 0, 0, ErrorMessage, sizeof(ErrorMessage));
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if (MF == NULL) {
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fclose(ST.fp);
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Env->ThrowError("FFmpegSource: Can't parse Matroska file: %s", ErrorMessage);
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}
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VideoTrack = GetTrackIndex(AVideoTrack, TT_VIDEO, Env);
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AudioTrack = GetTrackIndex(AAudioTrack, TT_AUDIO, Env);
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bool VCacheIsValid = true;
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bool ACacheIsValid = true;
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if (VideoTrack >= 0) {
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VCacheIsValid = LoadFrameInfoFromFile(AVideoCache, ASource, VideoTrack);
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VideoTI = mkv_GetTrackInfo(MF, VideoTrack);
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if (VideoTI->CompEnabled) {
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VideoCS = cs_Create(MF, VideoTrack, ErrorMessage, sizeof(ErrorMessage));
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if (VideoCS == NULL)
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Env->ThrowError("FFmpegSource: Can't create decompressor: %s", ErrorMessage);
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}
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VideoCodecContext = avcodec_alloc_context();
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VideoCodecContext->extradata = (uint8_t *)VideoTI->CodecPrivate;
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VideoCodecContext->extradata_size = VideoTI->CodecPrivateSize;
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VideoCodec = avcodec_find_decoder(MatroskaToFFCodecID(VideoTI));
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if (VideoCodec == NULL)
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Env->ThrowError("FFmpegSource: Video codec not found");
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if (avcodec_open(VideoCodecContext, VideoCodec) < 0)
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Env->ThrowError("FFmpegSource: Could not open video codec");
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// Fix for mpeg2 and other formats where decoding a frame is necessary to get information about the stream
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if (VideoCodecContext->pix_fmt == PIX_FMT_NONE) {
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mkv_SetTrackMask(MF, ~(1 << VideoTrack));
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int64_t Dummy;
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DecodeNextFrame(DecodeFrame, &Dummy, Env);
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mkv_Seek(MF, 0, MKVF_SEEK_TO_PREV_KEYFRAME);
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}
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VI.image_type = VideoInfo::IT_TFF;
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VI.width = VideoTI->AV.Video.PixelWidth;
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VI.height = VideoTI->AV.Video.PixelHeight;
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VI.fps_denominator = 1;
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VI.fps_numerator = 30;
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SetOutputFormat(VideoCodecContext->pix_fmt, Env);
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InitPP(VI.width, VI.height, APPString, AQuality, VideoCodecContext->pix_fmt, Env);
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if (!VCacheIsValid)
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TrackMask &= ~(1 << VideoTrack);
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}
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if (AudioTrack >= 0) {
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TrackInfo *AudioTI = mkv_GetTrackInfo(MF, AudioTrack);
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if (AudioTI->CompEnabled) {
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AudioCS = cs_Create(MF, AudioTrack, ErrorMessage, sizeof(ErrorMessage));
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if (AudioCS == NULL)
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Env->ThrowError("FFmpegSource: Can't create decompressor: %s", ErrorMessage);
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}
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AudioCodecContext = avcodec_alloc_context();
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AudioCodecContext->extradata = (uint8_t *)AudioTI->CodecPrivate;
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AudioCodecContext->extradata_size = AudioTI->CodecPrivateSize;
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AudioCodec = avcodec_find_decoder(MatroskaToFFCodecID(AudioTI));
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if (AudioCodec == NULL)
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Env->ThrowError("FFmpegSource: Audio codec not found");
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if (avcodec_open(AudioCodecContext, AudioCodec) < 0)
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Env->ThrowError("FFmpegSource: Could not open audio codec");
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// Fix for ac3 and other codecs where decoding a block of audio is required to get information about it
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if (AudioCodecContext->channels == 0 || AudioCodecContext->sample_rate == 0) {
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mkv_SetTrackMask(MF, ~(1 << AudioTrack));
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uint64_t StartTime, EndTime, FilePos;
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unsigned int Track, FrameFlags, FrameSize;
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mkv_ReadFrame(MF, 0, &Track, &StartTime, &EndTime, &FilePos, &FrameSize, &FrameFlags);
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uint8_t DecodingBuffer[AVCODEC_MAX_AUDIO_FRAME_SIZE];
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int Size = ReadFrame(FilePos, FrameSize, AudioCS, Env);
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uint8_t *Data = Buffer;
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while (Size > 0) {
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int TempOutputBufSize = AVCODEC_MAX_AUDIO_FRAME_SIZE;
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int Ret = avcodec_decode_audio2(AudioCodecContext, (int16_t *)DecodingBuffer, &TempOutputBufSize, Data, Size);
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if (Ret < 0)
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Env->ThrowError("FFmpegSource: Audio decoding error");
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Size -= Ret;
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Data += Ret;
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}
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mkv_Seek(MF, 0, MKVF_SEEK_TO_PREV_KEYFRAME);
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}
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VI.nchannels = AudioCodecContext->channels;
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VI.audio_samples_per_second = AudioCodecContext->sample_rate;
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switch (AudioCodecContext->sample_fmt) {
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case SAMPLE_FMT_U8: VI.sample_type = SAMPLE_INT8; break;
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case SAMPLE_FMT_S16: VI.sample_type = SAMPLE_INT16; break;
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case SAMPLE_FMT_S24: VI.sample_type = SAMPLE_INT24; break;
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case SAMPLE_FMT_S32: VI.sample_type = SAMPLE_INT32; break;
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case SAMPLE_FMT_FLT: VI.sample_type = SAMPLE_FLOAT; break;
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default:
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Env->ThrowError("FFmpegSource: Unsupported/unknown sample format");
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}
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ACacheIsValid = PrepareAudioCache(AAudioCache, ASource, AudioTrack, Env);
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if (!ACacheIsValid)
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TrackMask &= ~(1 << AudioTrack);
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}
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mkv_SetTrackMask(MF, TrackMask);
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uint8_t DecodingBuffer[AVCODEC_MAX_AUDIO_FRAME_SIZE];
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// Needs to be indexed?
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if (!ACacheIsValid || !VCacheIsValid) {
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uint64_t StartTime, EndTime, FilePos;
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unsigned int Track, FrameFlags, FrameSize;
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while (mkv_ReadFrame(MF, 0, &Track, &StartTime, &EndTime, &FilePos, &FrameSize, &FrameFlags) == 0)
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if (Track == VideoTrack && !VCacheIsValid) {
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FrameToDTS.push_back(FrameInfo(StartTime, (FrameFlags & FRAME_KF) != 0));
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VI.num_frames++;
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} else if (Track == AudioTrack && !ACacheIsValid) {
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int Size = ReadFrame(FilePos, FrameSize, AudioCS, Env);
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uint8_t *Data = Buffer;
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while (Size > 0) {
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int TempOutputBufSize = AVCODEC_MAX_AUDIO_FRAME_SIZE;
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int Ret = avcodec_decode_audio2(AudioCodecContext, (int16_t *)DecodingBuffer, &TempOutputBufSize, Data, Size);
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if (Ret < 0)
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Env->ThrowError("FFmpegSource: Audio decoding error");
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Size -= Ret;
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Data += Ret;
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VI.num_audio_samples += VI.AudioSamplesFromBytes(TempOutputBufSize);
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fwrite(DecodingBuffer, 1, TempOutputBufSize, AudioCache);
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}
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}
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if (VideoTrack >= 0 && VI.num_frames == 0)
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Env->ThrowError("FFmpegSource: Video track contains no frames");
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if (AudioTrack >= 0 && VI.num_audio_samples == 0)
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Env->ThrowError("FFmpegSource: Audio track contains no samples");
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if (VideoTrack >= 0)
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mkv_Seek(MF, FrameToDTS.front().DTS, MKVF_SEEK_TO_PREV_KEYFRAME);
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if (AVCache && !VCacheIsValid)
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if (!SaveFrameInfoToFile(AVideoCache, ASource, VideoTrack))
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Env->ThrowError("FFmpegSource: Failed to write video cache info");
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}
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if (AudioTrack >= 0) {
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avcodec_close(AudioCodecContext);
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av_free(AudioCodecContext);
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}
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if (VideoTrack >= 0) {
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mkv_SetTrackMask(MF, ~(1 << VideoTrack));
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// Calculate the average framerate
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if (FrameToDTS.size() >= 2) {
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double DTSDiff = (double)(FrameToDTS.back().DTS - FrameToDTS.front().DTS);
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VI.fps_denominator = (unsigned int)(DTSDiff * mkv_TruncFloat(VideoTI->TimecodeScale) / (double)1000 / (double)(VI.num_frames - 1) + 0.5);
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VI.fps_numerator = 1000000;
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}
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if (!SaveTimecodesToFile(ATimecodes, mkv_TruncFloat(VideoTI->TimecodeScale), 1000000))
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Env->ThrowError("FFmpegSource: Failed to write timecodes");
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}
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}
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~FFMatroskaSource() {
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free(Buffer);
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mkv_Close(MF);
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fclose(ST.fp);
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if (AudioCache)
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fclose(AudioCache);
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if (VideoCodecContext)
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avcodec_close(VideoCodecContext);
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av_free(VideoCodecContext);
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}
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PVideoFrame __stdcall GetFrame(int n, IScriptEnvironment* Env);
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};
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int FFMatroskaSource::ReadFrame(uint64_t AFilePos, unsigned int AFrameSize, CompressedStream *ACS, IScriptEnvironment *Env) {
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if (ACS) {
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char CSBuffer[4096];
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unsigned int DecompressedFrameSize = 0;
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cs_NextFrame(ACS, AFilePos, AFrameSize);
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for (;;) {
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int ReadBytes = cs_ReadData(ACS, CSBuffer, sizeof(CSBuffer));
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if (ReadBytes < 0)
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Env->ThrowError("FFmpegSource: Error decompressing data: %s", cs_GetLastError(ACS));
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if (ReadBytes == 0) {
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return DecompressedFrameSize;
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}
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if (BufferSize < DecompressedFrameSize + ReadBytes) {
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BufferSize = AFrameSize;
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Buffer = (uint8_t *)realloc(Buffer, BufferSize);
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if (Buffer == NULL)
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Env->ThrowError("FFmpegSource: Out of memory");
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}
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memcpy(Buffer + DecompressedFrameSize, CSBuffer, ReadBytes);
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DecompressedFrameSize += ReadBytes;
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}
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} else {
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if (_fseeki64(ST.fp, AFilePos, SEEK_SET))
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Env->ThrowError("FFmpegSource: fseek(): %s", strerror(errno));
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if (BufferSize < AFrameSize) {
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BufferSize = AFrameSize;
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Buffer = (uint8_t *)realloc(Buffer, BufferSize);
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if (Buffer == NULL)
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Env->ThrowError("FFmpegSource: Out of memory");
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}
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size_t ReadBytes = fread(Buffer, 1, AFrameSize, ST.fp);
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if (ReadBytes != AFrameSize) {
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if (ReadBytes == 0) {
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if (feof(ST.fp))
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Env->ThrowError("FFmpegSource: Unexpected EOF while reading frame");
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else
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Env->ThrowError("FFmpegSource: Error reading frame: %s", strerror(errno));
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} else
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Env->ThrowError("FFmpegSource: Short read while reading frame");
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Env->ThrowError("FFmpegSource: Unknown read error");
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}
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return AFrameSize;
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}
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return 0;
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}
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int FFMatroskaSource::DecodeNextFrame(AVFrame *AFrame, int64_t *AFirstStartTime, IScriptEnvironment* Env) {
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int FrameFinished = 0;
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int Ret = -1;
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*AFirstStartTime = -1;
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uint64_t StartTime, EndTime, FilePos;
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unsigned int Track, FrameFlags, FrameSize;
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while (mkv_ReadFrame(MF, 0, &Track, &StartTime, &EndTime, &FilePos, &FrameSize, &FrameFlags) == 0) {
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FrameSize = ReadFrame(FilePos, FrameSize, VideoCS, Env);
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if (*AFirstStartTime < 0)
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*AFirstStartTime = StartTime;
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Ret = avcodec_decode_video(VideoCodecContext, AFrame, &FrameFinished, Buffer, FrameSize);
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if (FrameFinished)
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goto Done;
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}
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// Flush the last frame
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if (CurrentFrame == VI.num_frames - 1 && VideoCodecContext->has_b_frames)
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Ret = avcodec_decode_video(VideoCodecContext, AFrame, &FrameFinished, NULL, 0);
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Done:
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return Ret;
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}
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PVideoFrame __stdcall FFMatroskaSource::GetFrame(int n, IScriptEnvironment* Env) {
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bool HasSeeked = false;
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if (n < CurrentFrame || FindClosestKeyFrame(n) > CurrentFrame) {
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mkv_Seek(MF, FrameToDTS[n].DTS, MKVF_SEEK_TO_PREV_KEYFRAME);
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avcodec_flush_buffers(VideoCodecContext);
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HasSeeked = true;
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}
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do {
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int64_t StartTime;
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int Ret = DecodeNextFrame(DecodeFrame, &StartTime, Env);
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if (HasSeeked) {
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HasSeeked = false;
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if (StartTime < 0 || (CurrentFrame = FrameFromDTS(StartTime)) < 0)
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Env->ThrowError("FFmpegSource: Frame accurate seeking is not possible in this file");
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}
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CurrentFrame++;
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} while (CurrentFrame <= n);
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return OutputFrame(DecodeFrame, Env);
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}
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class FFmpegSource : public FFBase {
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private:
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AVFormatContext *FormatContext;
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AVCodecContext *VideoCodecContext;
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int VideoTrack;
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int CurrentFrame;
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int SeekMode;
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int DecodeNextFrame(AVFrame *Frame, int64_t *DTS);
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int GetTrackIndex(int Index, CodecType ATrackType, IScriptEnvironment *Env) {
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if (Index == -1)
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for (unsigned int i = 0; i < FormatContext->nb_streams; i++)
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if (FormatContext->streams[i]->codec->codec_type == ATrackType) {
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Index = i;
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break;
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}
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if (Index == -1)
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Env->ThrowError("FFmpegSource: No %s track found", (ATrackType == CODEC_TYPE_VIDEO) ? "video" : "audio");
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if (Index <= -2)
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return -2;
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if (Index >= (int)FormatContext->nb_streams)
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Env->ThrowError("FFmpegSource: Invalid %s track number", (ATrackType == CODEC_TYPE_VIDEO) ? "video" : "audio");
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if (FormatContext->streams[Index]->codec->codec_type != ATrackType)
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Env->ThrowError("FFmpegSource: Selected track is not %s", (ATrackType == CODEC_TYPE_VIDEO) ? "video" : "audio");
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return Index;
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}
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public:
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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) {
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CurrentFrame = 0;
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SeekMode = ASeekMode;
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AVCodecContext *AudioCodecContext = NULL;
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AVCodec *AudioCodec;
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AVCodec *VideoCodec;
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FormatContext = NULL;
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VideoCodecContext = NULL;
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VideoCodec = NULL;
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if (av_open_input_file(&FormatContext, ASource, NULL, 0, NULL) != 0)
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Env->ThrowError("FFmpegSource: Couldn't open '%s'", ASource);
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if (av_find_stream_info(FormatContext) < 0)
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Env->ThrowError("FFmpegSource: Couldn't find stream information");
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VideoTrack = GetTrackIndex(AVideoTrack, CODEC_TYPE_VIDEO, Env);
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int AudioTrack = GetTrackIndex(AAudioTrack, CODEC_TYPE_AUDIO, Env);
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bool VCacheIsValid = true;
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bool ACacheIsValid = true;
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if (VideoTrack >= 0) {
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VCacheIsValid = LoadFrameInfoFromFile(AVideoCache, ASource, VideoTrack);
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VideoCodecContext = FormatContext->streams[VideoTrack]->codec;
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VideoCodec = avcodec_find_decoder(VideoCodecContext->codec_id);
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if (VideoCodec == NULL)
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Env->ThrowError("FFmpegSource: Video codec not found");
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if (avcodec_open(VideoCodecContext, VideoCodec) < 0)
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Env->ThrowError("FFmpegSource: Could not open video codec");
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VI.image_type = VideoInfo::IT_TFF;
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VI.width = VideoCodecContext->width;
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VI.height = VideoCodecContext->height;
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VI.fps_denominator = FormatContext->streams[VideoTrack]->time_base.num;
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VI.fps_numerator = FormatContext->streams[VideoTrack]->time_base.den;
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// sanity check framerate
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if (VI.fps_denominator > VI.fps_numerator || VI.fps_denominator <= 0 || VI.fps_numerator <= 0) {
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|
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";
|
|
};
|
|
|