forked from mia/Aegisub
422 lines
14 KiB
C++
422 lines
14 KiB
C++
// Copyright (c) 2007-2008 Fredrik Mellbin
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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#include "ffmpegsource.h"
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int FFMatroskaSource::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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FFMatroskaSource::FFMatroskaSource(const char *ASource, int AVideoTrack, int AAudioTrack, const char *ATimecodes,
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bool AVCache, const char *AVideoCache, const char *AAudioCache, const char *APPString,
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int AQuality, int AThreads, 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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VideoCodecContext->thread_count = AThreads;
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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 || VideoCodecContext->width == 0 || VideoCodecContext->height == 0) {
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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 = VideoCodecContext->width;
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VI.height = VideoCodecContext->height;;
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VI.fps_denominator = 1;
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VI.fps_numerator = 30;
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if (VI.width <= 0 || VI.height <= 0)
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Env->ThrowError("FFmpegSource: Codec returned zero size video");
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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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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 = OpenAudioCache(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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// Needs to be indexed?
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if (!ACacheIsValid || !VCacheIsValid) {
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FILE *RawCache = NULL;
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if (!ACacheIsValid)
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AudioCacheType = acRaw;
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switch (AudioCacheType) {
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case acRaw: RawCache = NewRawCacheWriter(AAudioCache, ASource, AudioTrack, Env); break;
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}
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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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Frames.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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int DecodedSamples = (int)VI.AudioSamplesFromBytes(TempOutputBufSize);
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Size -= Ret;
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Data += Ret;
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VI.num_audio_samples += DecodedSamples;
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if (AudioCacheType == acRaw) {
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fwrite(DecodingBuffer, 1, TempOutputBufSize, RawCache);
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}
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}
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}
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if (!ACacheIsValid) {
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switch (AudioCacheType) {
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case acRaw: CloseRawCacheWriter(RawCache); break;
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}
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ACacheIsValid = OpenAudioCache(AAudioCache, ASource, AudioTrack, Env);
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if (!ACacheIsValid)
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Env->ThrowError("FFmpegSource: Failed to open newly created audio cache for reading");
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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, Frames.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 (Frames.size() >= 2) {
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double DTSDiff = (double)(Frames.back().DTS - Frames.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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// Set AR variables
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int ffsar_num = VideoTI->AV.Video.DisplayWidth * VideoTI->AV.Video.PixelHeight;
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int ffsar_den = VideoTI->AV.Video.DisplayHeight * VideoTI->AV.Video.PixelWidth;
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Env->SetVar("FFSAR_NUM", ffsar_num);
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Env->SetVar("FFSAR_DEN", ffsar_den);
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Env->SetVar("FFSAR", ffsar_num / (double)ffsar_den);
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// Set crop variables
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Env->SetVar("FFCROP_LEFT", (int)VideoTI->AV.Video.CropL);
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Env->SetVar("FFCROP_RIGHT", (int)VideoTI->AV.Video.CropR);
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Env->SetVar("FFCROP_TOP", (int)VideoTI->AV.Video.CropT);
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Env->SetVar("FFCROP_BOTTOM", (int)VideoTI->AV.Video.CropB);
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}
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}
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FFMatroskaSource::~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 (VideoCodecContext)
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avcodec_close(VideoCodecContext);
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av_free(VideoCodecContext);
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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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if (*AFirstStartTime < 0)
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*AFirstStartTime = StartTime;
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FrameSize = ReadFrame(FilePos, FrameSize, VideoCS, Env);
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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 frames
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if (VideoCodecContext->has_b_frames)
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Ret = avcodec_decode_video(VideoCodecContext, AFrame, &FrameFinished, NULL, 0);
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if (!FrameFinished)
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goto Error;
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Error:
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Done:
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return Ret;
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}
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PVideoFrame FFMatroskaSource::GetFrame(int n, IScriptEnvironment* Env) {
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if (LastFrameNum == n)
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return LastFrame;
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bool HasSeeked = false;
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if (n < CurrentFrame || FindClosestKeyFrame(n) > CurrentFrame) {
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mkv_Seek(MF, Frames[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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LastFrame = OutputFrame(DecodeFrame, Env);
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LastFrameNum = n;
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return LastFrame;
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}
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