winamp/Src/pcm/avi_ulaw_decoder.cpp

95 lines
3.4 KiB
C++
Raw Normal View History

2024-09-24 12:54:57 +00:00
#include "avi_ulaw_decoder.h"
static int16_t MuLawDecompressTable[256] =
{
-32124,-31100,-30076,-29052,-28028,-27004,-25980,-24956,
-23932,-22908,-21884,-20860,-19836,-18812,-17788,-16764,
-15996,-15484,-14972,-14460,-13948,-13436,-12924,-12412,
-11900,-11388,-10876,-10364, -9852, -9340, -8828, -8316,
-7932, -7676, -7420, -7164, -6908, -6652, -6396, -6140,
-5884, -5628, -5372, -5116, -4860, -4604, -4348, -4092,
-3900, -3772, -3644, -3516, -3388, -3260, -3132, -3004,
-2876, -2748, -2620, -2492, -2364, -2236, -2108, -1980,
-1884, -1820, -1756, -1692, -1628, -1564, -1500, -1436,
-1372, -1308, -1244, -1180, -1116, -1052, -988, -924,
-876, -844, -812, -780, -748, -716, -684, -652,
-620, -588, -556, -524, -492, -460, -428, -396,
-372, -356, -340, -324, -308, -292, -276, -260,
-244, -228, -212, -196, -180, -164, -148, -132,
-120, -112, -104, -96, -88, -80, -72, -64,
-56, -48, -40, -32, -24, -16, -8, 0,
32124, 31100, 30076, 29052, 28028, 27004, 25980, 24956,
23932, 22908, 21884, 20860, 19836, 18812, 17788, 16764,
15996, 15484, 14972, 14460, 13948, 13436, 12924, 12412,
11900, 11388, 10876, 10364, 9852, 9340, 8828, 8316,
7932, 7676, 7420, 7164, 6908, 6652, 6396, 6140,
5884, 5628, 5372, 5116, 4860, 4604, 4348, 4092,
3900, 3772, 3644, 3516, 3388, 3260, 3132, 3004,
2876, 2748, 2620, 2492, 2364, 2236, 2108, 1980,
1884, 1820, 1756, 1692, 1628, 1564, 1500, 1436,
1372, 1308, 1244, 1180, 1116, 1052, 988, 924,
876, 844, 812, 780, 748, 716, 684, 652,
620, 588, 556, 524, 492, 460, 428, 396,
372, 356, 340, 324, 308, 292, 276, 260,
244, 228, 212, 196, 180, 164, 148, 132,
120, 112, 104, 96, 88, 80, 72, 64,
56, 48, 40, 32, 24, 16, 8, 0
};
AVIULawDecoder::AVIULawDecoder(const nsavi::audio_format *waveformat) : waveformat(waveformat)
{
}
int AVIULawDecoder::OutputFrameSize(size_t *frame_size)
{
*frame_size = waveformat->block_align; // TODO
return AVI_SUCCESS;
}
int AVIULawDecoder::GetOutputProperties(unsigned int *sampleRate, unsigned int *channels, unsigned int *bitsPerSample, bool *isFloat)
{
if (waveformat)
{
*sampleRate = waveformat->sample_rate;
*channels = waveformat->channels;
*bitsPerSample = 16;
*isFloat = false; // TODO
return AVI_SUCCESS;
}
else
{
return AVI_FAILURE;
}
}
int AVIULawDecoder::DecodeChunk(uint16_t type, void **inputBuffer, size_t *inputBufferBytes, void *outputBuffer, size_t *outputBufferBytes)
{
size_t num_samples = min(*inputBufferBytes, *outputBufferBytes / 2);
const uint8_t *in = (const uint8_t *)*inputBuffer;
int16_t *out = (int16_t *)outputBuffer;
for (size_t i=0;i!=num_samples;i++)
{
out[i] = MuLawDecompressTable[in[i]];
}
*outputBufferBytes = num_samples * 2;
*inputBufferBytes -= num_samples;
*inputBuffer = (uint8_t *)inputBuffer + num_samples;
return AVI_SUCCESS;
}
void AVIULawDecoder::Close()
{
delete this;
}
#define CBCLASS AVIULawDecoder
START_DISPATCH;
CB(OUTPUT_FRAME_SIZE, OutputFrameSize)
CB(GET_OUTPUT_PROPERTIES, GetOutputProperties)
CB(DECODE_CHUNK, DecodeChunk)
VCB(CLOSE, Close)
END_DISPATCH;
#undef CBCLASS