/* the Music Player Daemon (MPD) * (c)2003-2004 by Warren Dukes (shank@mercury.chem.pitt.edu) * This project's homepage is: http://www.musicpd.org * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #include "pcm_utils.h" #include "mpd_types.h" #include "log.h" #include <string.h> #include <math.h> #include <assert.h> void pcm_changeBufferEndianness(char * buffer, int bufferSize, int bits) { char temp; switch(bits) { case 16: while(bufferSize) { temp = *buffer; *buffer = *(buffer+1); *(buffer+1) = temp; bufferSize-=2; } break; } } void pcm_volumeChange(char * buffer, int bufferSize, AudioFormat * format, int volume) { mpd_sint32 temp32; mpd_sint8 * buffer8 = (mpd_sint8 *)buffer; mpd_sint16 * buffer16 = (mpd_sint16 *)buffer; if(volume>=1000) return; if(volume<=0) { memset(buffer,0,bufferSize); return; } switch(format->bits) { case 16: while(bufferSize>0) { temp32 = *buffer16; temp32*= volume; temp32/=1000; *buffer16 = temp32>32767 ? 32767 : (temp32<-32768 ? -32768 : temp32); buffer16++; bufferSize-=2; } break; case 8: while(bufferSize>0) { temp32 = *buffer8; temp32*= volume; temp32/=1000; *buffer8 = temp32>127 ? 127 : (temp32<-128 ? -128 : temp32); buffer8++; bufferSize--; } break; default: ERROR("%i bits not supported by pcm_volumeChange!\n", format->bits); exit(EXIT_FAILURE); } } void pcm_add(char * buffer1, char * buffer2, size_t bufferSize1, size_t bufferSize2, int vol1, int vol2, AudioFormat * format) { mpd_sint32 temp32; mpd_sint8 * buffer8_1 = (mpd_sint8 *)buffer1; mpd_sint8 * buffer8_2 = (mpd_sint8 *)buffer2; mpd_sint16 * buffer16_1 = (mpd_sint16 *)buffer1; mpd_sint16 * buffer16_2 = (mpd_sint16 *)buffer2; switch(format->bits) { case 16: while(bufferSize1>0 && bufferSize2>0) { temp32 = (vol1*(*buffer16_1)+vol2*(*buffer16_2))/1000; *buffer16_1 = temp32>32767 ? 32767 : (temp32<-32768 ? -32768 : temp32); buffer16_1++; buffer16_2++; bufferSize1-=2; bufferSize2-=2; } if(bufferSize2>0) memcpy(buffer16_1,buffer16_2,bufferSize2); break; case 8: while(bufferSize1>0 && bufferSize2>0) { temp32 = (vol1*(*buffer8_1)+vol2*(*buffer8_2))/1000; *buffer8_1 = temp32>127 ? 127 : (temp32<-128 ? -128 : temp32); buffer8_1++; buffer8_2++; bufferSize1--; bufferSize2--; } if(bufferSize2>0) memcpy(buffer8_1,buffer8_2,bufferSize2); break; default: ERROR("%i bits not supported by pcm_add!\n",format->bits); exit(EXIT_FAILURE); } } void pcm_mix(char * buffer1, char * buffer2, size_t bufferSize1, size_t bufferSize2, AudioFormat * format, float portion1) { int vol1; float s = sin(M_PI_2*portion1); s*=s; vol1 = s*1000+0.5; vol1 = vol1>1000 ? 1000 : ( vol1<0 ? 0 : vol1 ); pcm_add(buffer1,buffer2,bufferSize1,bufferSize2,vol1,1000-vol1,format); } /* outFormat bits must be 16 and channels must be 2! */ void pcm_convertAudioFormat(AudioFormat * inFormat, char * inBuffer, size_t inSize, AudioFormat * outFormat, char * outBuffer) { static char * bitConvBuffer = NULL; static int bitConvBufferLength = 0; static char * channelConvBuffer = NULL; static int channelConvBufferLength = 0; char * dataChannelConv; int dataChannelLen; char * dataBitConv; int dataBitLen; assert(outFormat->bits==16); assert(outFormat->channels==2); /* converts */ switch(inFormat->bits) { case 8: dataBitLen = inSize << 1; if(dataBitLen > bitConvBufferLength) { bitConvBuffer = realloc(bitConvBuffer, dataBitLen); bitConvBufferLength = dataBitLen; } dataBitConv = bitConvBuffer; { mpd_sint8 * in = (mpd_sint8 *)inBuffer; mpd_sint16 * out = (mpd_sint16 *)dataBitConv; int i; for(i=0; i<inSize; i++) { *out++ = (*in++) << 8; } } break; case 16: dataBitConv = inBuffer; dataBitLen = inSize; break; case 24: /* put dithering code from mp3_decode here */ default: ERROR("only 8 or 16 bits are supported for conversion!\n"); exit(EXIT_FAILURE); } /* converts only between 16 bit audio between mono and stereo */ switch(inFormat->channels) { case 1: dataChannelLen = (dataBitLen >> 1) << 2; if(dataChannelLen > channelConvBufferLength) { channelConvBuffer = realloc(channelConvBuffer, dataChannelLen); channelConvBufferLength = dataChannelLen; } dataChannelConv = channelConvBuffer; { mpd_sint16 * in = (mpd_sint16 *)dataBitConv; mpd_sint16 * out = (mpd_sint16 *)dataChannelConv; int i, inSamples = dataBitLen >> 1; for(i=0;i<inSamples;i++) { *out++ = *in; *out++ = *in++; } } break; case 2: dataChannelConv = dataBitConv; dataChannelLen = dataBitLen; break; default: ERROR("only 1 or 2 channels are supported for conversion!\n"); exit(EXIT_FAILURE); } if(inFormat->sampleRate == outFormat->sampleRate) { memcpy(outBuffer,dataChannelConv,dataChannelLen); } else { /* only works if outFormat is 16-bit stereo! */ /* resampling code blatantly ripped from ESD */ mpd_sint32 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_uint32)(outFormat->sampleRate)) / inFormat->sampleRate); nlen <<= shift; while( wr_dat < nlen / shift) { rd_dat = wr_dat * inFormat->sampleRate / outFormat->sampleRate; rd_dat &= ~1; lsample = in[ rd_dat++ ]; rsample = in[ rd_dat++ ]; out[ wr_dat++ ] = lsample; out[ wr_dat++ ] = rsample; } } return; } size_t pcm_sizeOfOutputBufferForAudioFormatConversion(AudioFormat * inFormat, char * inBuffer, size_t inSize, AudioFormat * outFormat) { const int shift = sizeof(mpd_sint16); size_t outSize = inSize; switch(inFormat->bits) { case 8: outSize = outSize << 1; break; case 16: break; default: ERROR("only 8 or 16 bits are supported for conversion!\n"); 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); } outSize = (((outSize >> shift) * (mpd_uint32)(outFormat->sampleRate)) / inFormat->sampleRate); outSize <<= shift; return outSize; } /* vim:set shiftwidth=8 tabstop=8 expandtab: */