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Aegisub
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lavc audio: use mono only 

Originally committed to SVN as r339.
This commit is contained in:
David Lamparter 2006-04-14 23:45:28 +00:00
parent c21a6dd1d9
commit 8d0f650b58
1 changed files with 15 additions and 12 deletions
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27
core/audio_provider_lavc.cpp
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@ -79,19 +79,21 @@ LAVCAudioProvider::LAVCAudioProvider(wxString _filename, VideoProvider *vpro)
if (avcodec_open(codecContext, codec) < 0)
throw _T("Failed to open audio decoder");
int setsample = Options.AsInt(_T("Audio Sample Rate"));
bytes_per_sample = 2;
num_samples = stream->duration / bytes_per_sample;
if (setsample) {
rsct = audio_resample_init(1, codecContext->channels, setsample, codecContext->sample_rate);
sample_rate = setsample;
channels = 1;
resample_ratio = (float)setsample / (float)codecContext->sample_rate;
num_samples = (__int64)(num_samples * resample_ratio);
} else {
/* aegisub currently supports mono only, so always resample */
sample_rate = Options.AsInt(_T("Audio Sample Rate"));
if (!sample_rate)
sample_rate = codecContext->sample_rate;
channels = codecContext->channels;
}
channels = 1;
bytes_per_sample = 2;
rsct = audio_resample_init(1, codecContext->channels, sample_rate, codecContext->sample_rate);
if (!rsct)
throw _T("Failed to initialize resampling");
resample_ratio = (float)sample_rate / (float)codecContext->sample_rate;
num_samples = (__int64)(stream->duration / bytes_per_sample * resample_ratio);
buffer = (int16_t *)malloc(AVCODEC_MAX_AUDIO_FRAME_SIZE);
if (!buffer)
@ -146,6 +148,7 @@ void LAVCAudioProvider::GetAudio(void *buf, __int64 start, __int64 count)
assert(samples <= _count);
} else {
/* currently dead code, rsct != NULL because we're resampling for mono */
if (samples > _count)
samples = _count;
memcpy(_buf, buffer, samples << 1);