diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/pcm_utils.c | 68 |
1 files changed, 41 insertions, 27 deletions
diff --git a/src/pcm_utils.c b/src/pcm_utils.c index b3191a399..dffdbde8d 100644 --- a/src/pcm_utils.c +++ b/src/pcm_utils.c @@ -242,28 +242,42 @@ void pcm_convertAudioFormat(AudioFormat * inFormat, char * inBuffer, size_t else { /* only works if outFormat is 16-bit stereo! */ /* resampling code blatantly ripped from ESD */ - mpd_sint32 rd_dat = 0; + mpd_uint32 rd_dat = 0; mpd_uint32 wr_dat = 0; mpd_sint16 lsample, rsample; - register mpd_sint16 * out = (mpd_sint16 *)outBuffer; - register mpd_sint16 * in = (mpd_sint16 *)dataChannelConv; - const int shift = sizeof(mpd_sint16); - mpd_uint32 nlen = ((( dataChannelLen >> shift) * + mpd_sint16 * out = (mpd_sint16 *)outBuffer; + mpd_sint16 * in = (mpd_sint16 *)dataChannelConv; + const int shift = sizeof(mpd_sint16)*outFormat->channels; + mpd_uint32 nlen = ((( dataChannelLen / shift) * (mpd_uint32)(outFormat->sampleRate)) / inFormat->sampleRate); - nlen <<= shift; + nlen *= outFormat->channels; - while( wr_dat < nlen / shift) { - rd_dat = wr_dat * inFormat->sampleRate / - outFormat->sampleRate; - rd_dat &= ~1; + switch(outFormat->channels) { + case 1: + while( wr_dat < nlen) { + rd_dat = wr_dat * inFormat->sampleRate / + outFormat->sampleRate; + + lsample = in[ rd_dat++ ]; + + out[ wr_dat++ ] = lsample; + } + break; + case 2: + while( wr_dat < nlen) { + rd_dat = wr_dat * inFormat->sampleRate / + outFormat->sampleRate; + rd_dat &= ~1; - lsample = in[ rd_dat++ ]; - rsample = in[ rd_dat++ ]; + lsample = in[ rd_dat++ ]; + rsample = in[ rd_dat++ ]; - out[ wr_dat++ ] = lsample; - out[ wr_dat++ ] = rsample; - } + out[ wr_dat++ ] = lsample; + out[ wr_dat++ ] = rsample; + } + break; + } } return; @@ -272,7 +286,7 @@ void pcm_convertAudioFormat(AudioFormat * inFormat, char * inBuffer, size_t size_t pcm_sizeOfOutputBufferForAudioFormatConversion(AudioFormat * inFormat, size_t inSize, AudioFormat * outFormat) { - const int shift = sizeof(mpd_sint16); + const int shift = sizeof(mpd_sint16)*outFormat->channels; size_t outSize = inSize; switch(inFormat->bits) { @@ -286,21 +300,21 @@ size_t pcm_sizeOfOutputBufferForAudioFormatConversion(AudioFormat * inFormat, exit(EXIT_FAILURE); } - switch(inFormat->channels) { - case 1: - outSize = (outSize >> 1) << 2; - break; - case 2: - break; - default: - ERROR("only 1 or 2 channels are supported for conversion!\n"); - exit(EXIT_FAILURE); + if(inFormat->channels != outFormat->channels) { + switch(inFormat->channels) { + case 1: + outSize = (outSize >> 1) << 2; + break; + case 2: + //outSize >>= 1; + break; + } } - outSize = (((outSize >> shift) * (mpd_uint32)(outFormat->sampleRate)) / + outSize = (((outSize / shift) * (mpd_uint32)(outFormat->sampleRate)) / inFormat->sampleRate); - outSize <<= shift; + outSize *= shift; return outSize; } |