mirror of https://github.com/odrling/Aegisub
278 lines
9.1 KiB
C++
278 lines
9.1 KiB
C++
#include "ffmpegsource.h"
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static DWORD WINAPI AVFindStreamInfoExecute(AVFormatContext *FormatContext) {
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return av_find_stream_info(FormatContext);
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}
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int FFmpegSource::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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FFmpegSource::FFmpegSource(const char *ASource, int AVideoTrack, int AAudioTrack, const char *ATimecodes, bool AVCache, const char *AVideoCache, const char *AAudioCache, int AACCompression, 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;
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VI.fps_numerator = 30;
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}
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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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}
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if (AudioTrack >= 0) {
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AudioCodecContext = FormatContext->streams[AudioTrack]->codec;
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AudioCodec = avcodec_find_decoder(AudioCodecContext->codec_id);
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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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switch (AudioCodecContext->sample_fmt) {
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case SAMPLE_FMT_U8: VI.sample_type = SAMPLE_INT8; AACCompression = -1; 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; AACCompression = -1; break;
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case SAMPLE_FMT_S32: VI.sample_type = SAMPLE_INT32; AACCompression = -1; break;
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case SAMPLE_FMT_FLT: VI.sample_type = SAMPLE_FLOAT; AACCompression = -1; 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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VI.nchannels = AudioCodecContext->channels;
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VI.audio_samples_per_second = AudioCodecContext->sample_rate;
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ACacheIsValid = OpenAudioCache(AAudioCache, ASource, AudioTrack, Env);
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}
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// Needs to be indexed?
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if (!ACacheIsValid || !VCacheIsValid) {
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FLAC__StreamEncoder *FSE = NULL;
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FILE *RawCache = NULL;
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if (!ACacheIsValid)
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if (AACCompression >= 0)
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AudioCacheType = acFLAC;
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else
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AudioCacheType = acRaw;
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switch (AudioCacheType) {
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case acFLAC: FSE = NewFLACCacheWriter(AAudioCache, ASource, AudioTrack, AACCompression, Env); break;
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case acRaw: RawCache = NewRawCacheWriter(AAudioCache, ASource, AudioTrack, Env); break;
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}
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AVPacket Packet;
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while (av_read_frame(FormatContext, &Packet) >= 0) {
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if (Packet.stream_index == VideoTrack && !VCacheIsValid) {
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FrameToDTS.push_back(FrameInfo(Packet.dts, (Packet.flags & PKT_FLAG_KEY) ? 1 : 0));
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VI.num_frames++;
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} else if (Packet.stream_index == AudioTrack && !ACacheIsValid) {
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int Size = Packet.size;
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uint8_t *Data = Packet.data;
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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 = 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 == acFLAC) {
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for (int i = 0; i < DecodedSamples * VI.nchannels; i++)
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FLACBuffer[i] = ((int16_t *)DecodingBuffer)[i];
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FLAC__stream_encoder_process_interleaved(FSE, FLACBuffer, DecodedSamples);
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} else 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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av_free_packet(&Packet);
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}
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if (!ACacheIsValid) {
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switch (AudioCacheType) {
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case acFLAC: CloseFLACCacheWriter(FSE); break;
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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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av_seek_frame(FormatContext, VideoTrack, FrameToDTS.front().DTS, AVSEEK_FLAG_BACKWARD);
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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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if (VideoTrack >= 0) {
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if (!SaveTimecodesToFile(ATimecodes, FormatContext->streams[VideoTrack]->time_base.num * 1000, FormatContext->streams[VideoTrack]->time_base.den))
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Env->ThrowError("FFmpegSource: Failed to write timecodes");
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// Adjust framerate to match the duration of the first frame
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if (FrameToDTS.size() >= 2) {
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int64_t DTSDiff = (double)(FrameToDTS[1].DTS - FrameToDTS[0].DTS);
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VI.fps_denominator *= DTSDiff;
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}
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}
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}
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FFmpegSource::~FFmpegSource() {
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if (VideoTrack >= 0)
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avcodec_close(VideoCodecContext);
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av_close_input_file(FormatContext);
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}
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int FFmpegSource::DecodeNextFrame(AVFrame *AFrame, int64_t *AStartTime) {
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AVPacket Packet;
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int FrameFinished = 0;
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int Ret = -1;
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*AStartTime = -1;
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while (av_read_frame(FormatContext, &Packet) >= 0) {
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if (Packet.stream_index == VideoTrack) {
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Ret = avcodec_decode_video(VideoCodecContext, AFrame, &FrameFinished, Packet.data, Packet.size);
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if (*AStartTime < 0)
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*AStartTime = Packet.dts;
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}
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av_free_packet(&Packet);
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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 FFmpegSource::GetFrame(int n, IScriptEnvironment* Env) {
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bool HasSeeked = false;
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int ClosestKF = FindClosestKeyFrame(n);
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if (SeekMode == 0) {
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if (n < CurrentFrame) {
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av_seek_frame(FormatContext, VideoTrack, FrameToDTS.front().DTS, AVSEEK_FLAG_BACKWARD);
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avcodec_flush_buffers(VideoCodecContext);
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CurrentFrame = 0;
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}
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} else {
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// 10 frames is used as a margin to prevent excessive seeking since the predicted best keyframe isn't always selected by avformat
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if (n < CurrentFrame || ClosestKF > CurrentFrame + 10 || (SeekMode == 3 && n > CurrentFrame + 10)) {
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av_seek_frame(FormatContext, VideoTrack, (SeekMode == 3) ? FrameToDTS[n].DTS : FrameToDTS[ClosestKF].DTS, AVSEEK_FLAG_BACKWARD);
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avcodec_flush_buffers(VideoCodecContext);
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HasSeeked = true;
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}
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}
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do {
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int64_t StartTime;
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DecodeNextFrame(DecodeFrame, &StartTime);
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if (HasSeeked) {
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HasSeeked = false;
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// Is the seek destination time known? Does it belong to a frame?
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if (StartTime < 0 || (CurrentFrame = FrameFromDTS(StartTime)) < 0) {
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switch (SeekMode) {
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case 1:
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Env->ThrowError("FFmpegSource: Frame accurate seeking is not possible in this file");
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case 2:
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case 3:
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CurrentFrame = ClosestFrameFromDTS(StartTime);
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break;
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default:
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Env->ThrowError("FFmpegSource: Failed assertion");
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}
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}
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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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