winamp/Src/pcm/mp4_ulaw_decoder.cpp
2024-09-24 14:54:57 +02:00

98 lines
3.5 KiB
C++

#include "mp4_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
};
MP4ulawDecoder::MP4ulawDecoder()
{
}
int MP4ulawDecoder::Open()
{
return MP4_SUCCESS;
}
void MP4ulawDecoder::Close()
{
}
int MP4ulawDecoder::GetOutputProperties(unsigned int *sampleRate, unsigned int *channels, unsigned int *bitsPerSample)
{
// TODO
*channels = 1;
*bitsPerSample = 16;
return MP4_SUCCESS;
}
int MP4ulawDecoder::DecodeSample(void *inputBuffer, size_t inputBufferBytes, void *outputBuffer, size_t *outputBufferBytes)
{
const uint8_t *in = (const uint8_t *)inputBuffer;
*outputBufferBytes=0;
int16_t *out = (int16_t *)outputBuffer;
while (inputBufferBytes--)
{
*outputBufferBytes = *outputBufferBytes + 2;
*out++ = MuLawDecompressTable[*in++];
}
return MP4_SUCCESS;
}
int MP4ulawDecoder::CanHandleCodec(const char *codecName)
{
return !strcmp(codecName, "ulaw");
}
int MP4ulawDecoder::RequireChunks()
{
return 1;
}
#define CBCLASS MP4ulawDecoder
START_DISPATCH;
CB(MPEG4_AUDIO_OPEN, Open)
//CB(MPEG4_AUDIO_OPEN_EX, OpenEx)
//CB(MPEG4_AUDIO_ASC, AudioSpecificConfiguration)
//CB(MPEG4_AUDIO_BITRATE, GetCurrentBitrate)
//CB(MPEG4_AUDIO_FRAMESIZE, OutputFrameSize)
CB(MPEG4_AUDIO_OUTPUTINFO, GetOutputProperties)
//CB(MPEG4_AUDIO_OUTPUTINFO_EX, GetOutputPropertiesEx)
CB(MPEG4_AUDIO_DECODE, DecodeSample)
//VCB(MPEG4_AUDIO_FLUSH, Flush)
VCB(MPEG4_AUDIO_CLOSE, Close)
CB(MPEG4_AUDIO_HANDLES_CODEC, CanHandleCodec)
//CB(MPEG4_AUDIO_HANDLES_TYPE, CanHandleType)
//CB(MPEG4_AUDIO_HANDLES_MPEG4_TYPE, CanHandleMPEG4Type)
//CB(MPEG4_AUDIO_SET_GAIN, SetGain)
CB(MPEG4_AUDIO_REQUIRE_CHUNKS, RequireChunks)
END_DISPATCH;
#undef CBCLASS