void FFMS_Indexer::WriteAudio(SharedAudioContext &AudioContext, FFMS_Index *Index, int Track) {
// Delay writer creation until after an audio frame has been decoded. This ensures that all parameters are known when writing the headers.
if (!DecodeFrame->nb_samples) return;
if (!AudioContext.W64Writer) {
FFMS_AudioProperties AP;
FillAP(AP, AudioContext.CodecContext, (*Index)[Track]);
int FNSize = (*ANC)(SourceFile.c_str(), Track, &AP, NULL, 0, ANCPrivate);
if (FNSize <= 0) {
DumpMask = DumpMask & ~(1 << Track);
return;
}
int Format = av_get_packed_sample_fmt(AudioContext.CodecContext->sample_fmt);
std::vector<char> WName(FNSize + 1);
(*ANC)(SourceFile.c_str(), Track, &AP, &WName[0], FNSize, ANCPrivate);
WName.back() = 0;
try {
AudioContext.W64Writer =
new Wave64Writer(WName.data(),
av_get_bytes_per_sample(AudioContext.CodecContext->sample_fmt),
AudioContext.CodecContext->channels,
AudioContext.CodecContext->sample_rate,
(Format == AV_SAMPLE_FMT_FLT) || (Format == AV_SAMPLE_FMT_DBL));
} catch (...) {
throw FFMS_Exception(FFMS_ERROR_WAVE_WRITER, FFMS_ERROR_FILE_WRITE,
"Failed to write wave data");
}
}
AudioContext.W64Writer->WriteData(*DecodeFrame);
}
void FFMS_AudioSource::Init(const FFMS_Index &Index, int DelayMode) {
// Decode the first packet to ensure all properties are initialized
// Don't cache it since it might be in the wrong format
// Instead, leave it in DecodeFrame and it'll get cached later
while (DecodeFrame->nb_samples == 0)
DecodeNextBlock();
// Read properties of the audio which may not be available until the first
// frame has been decoded
FillAP(AP, CodecContext, Frames);
if (AP.SampleRate <= 0 || AP.BitsPerSample <= 0)
throw FFMS_Exception(FFMS_ERROR_DECODING, FFMS_ERROR_CODEC,
"Codec returned zero size audio");
std::auto_ptr<FFMS_ResampleOptions> opt(CreateResampleOptions());
SetOutputFormat(opt.get());
if (DelayMode < FFMS_DELAY_NO_SHIFT)
throw FFMS_Exception(FFMS_ERROR_INDEX, FFMS_ERROR_INVALID_ARGUMENT,
"Bad audio delay compensation mode");
if (DelayMode == FFMS_DELAY_NO_SHIFT) return;
if (DelayMode > (signed)Index.size())
throw FFMS_Exception(FFMS_ERROR_INDEX, FFMS_ERROR_INVALID_ARGUMENT,
"Out of bounds track index selected for audio delay compensation");
if (DelayMode >= 0 && Index[DelayMode].TT != FFMS_TYPE_VIDEO)
throw FFMS_Exception(FFMS_ERROR_INDEX, FFMS_ERROR_INVALID_ARGUMENT,
"Audio delay compensation must be relative to a video track");
int64_t Delay = 0;
if (DelayMode != FFMS_DELAY_TIME_ZERO) {
if (DelayMode == FFMS_DELAY_FIRST_VIDEO_TRACK) {
for (size_t i = 0; i < Index.size(); ++i) {
if (Index[i].TT == FFMS_TYPE_VIDEO && !Index[i].empty()) {
DelayMode = i;
break;
}
}
}
if (DelayMode >= 0) {
const FFMS_Track &VTrack = Index[DelayMode];
Delay = -(VTrack[0].PTS * VTrack.TB.Num * AP.SampleRate / (VTrack.TB.Den * 1000));
}
}
if (Frames.HasTS) {
int i = 0;
while (Frames[i].PTS == ffms_av_nopts_value) ++i;
Delay += Frames[i].PTS * Frames.TB.Num * AP.SampleRate / (Frames.TB.Den * 1000);
for (; i >= 0; --i)
Delay -= Frames[i].SampleCount;
}
AP.NumSamples += Delay;
}
