libmpcodecs/ad_pcm.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <unistd.h>
   4
   5 #include "config.h"
   6 #include "ad_internal.h"
   7 #include "libaf/af_format.h"
   8
   9 static ad_info_t info =
  10 {
  11         "Uncompressed PCM audio decoder",
  12         "pcm",
  13         "Nick Kurshev",
  14         "A'rpi",
  15         ""
  16 };
  17
  18 LIBAD_EXTERN(pcm)
  19
  20 static int init(sh_audio_t *sh_audio)
  21 {
  22   WAVEFORMATEX *h=sh_audio->wf;
  23   sh_audio->i_bps=h->nAvgBytesPerSec;
  24   sh_audio->channels=h->nChannels;
  25   sh_audio->samplerate=h->nSamplesPerSec;
  26   sh_audio->samplesize=(h->wBitsPerSample+7)/8;
  27   sh_audio->sample_format=AF_FORMAT_S16_LE; // default
  28   switch(sh_audio->format){ /* hardware formats: */
  29     case 0x0:
  30     case 0x1: // Microsoft PCM
  31     case 0xfffe: // Extended
  32        switch (sh_audio->samplesize) {
  33          case 1: sh_audio->sample_format=AF_FORMAT_U8; break;
  34          case 2: sh_audio->sample_format=AF_FORMAT_S16_LE; break;
  35          case 3: sh_audio->sample_format=AF_FORMAT_S24_LE; break;
  36          case 4: sh_audio->sample_format=AF_FORMAT_S32_LE; break;
  37        }
  38        break;
  39     case 0x3: // IEEE float
  40        sh_audio->sample_format=AF_FORMAT_FLOAT_LE;
  41        break;
  42     case 0x6:  sh_audio->sample_format=AF_FORMAT_A_LAW;break;
  43     case 0x7:  sh_audio->sample_format=AF_FORMAT_MU_LAW;break;
  44     case 0x11: sh_audio->sample_format=AF_FORMAT_IMA_ADPCM;break;
  45     case 0x50: sh_audio->sample_format=AF_FORMAT_MPEG2;break;
  46 /*    case 0x2000: sh_audio->sample_format=AFMT_AC3; */
  47     case 0x20776172: // 'raw '
  48        sh_audio->sample_format=AF_FORMAT_S16_BE;
  49        if(sh_audio->samplesize==1) sh_audio->sample_format=AF_FORMAT_U8;
  50        break;
  51     case 0x736F7774: // 'twos'
  52        sh_audio->sample_format=AF_FORMAT_S16_BE;
  53        // intended fall-through
  54     case 0x74776F73: // 'swot'
  55        if(sh_audio->samplesize==1) sh_audio->sample_format=AF_FORMAT_S8;
  56        break;
  57     case 0x32336c66: // 'fl32', bigendian float32
  58        sh_audio->sample_format=AF_FORMAT_FLOAT_BE;
  59        sh_audio->samplesize=4;
  60        break;
  61     case 0x666c3332: // '23lf', little endian float32, MPlayer internal fourCC
  62        sh_audio->sample_format=AF_FORMAT_FLOAT_LE;
  63        sh_audio->samplesize=4;
  64        break;
  65 /*    case 0x34366c66: // 'fl64', bigendian float64
  66        sh_audio->sample_format=AF_FORMAT_FLOAT_BE;
  67        sh_audio->samplesize=8;
  68        break;
  69     case 0x666c3634: // '46lf', little endian float64, MPlayer internal fourCC
  70        sh_audio->sample_format=AF_FORMAT_FLOAT_LE;
  71        sh_audio->samplesize=8;
  72        break;*/
  73     case 0x34326e69: // 'in24', bigendian int24
  74        sh_audio->sample_format=AF_FORMAT_S24_BE;
  75        sh_audio->samplesize=3;
  76        break;
  77     case 0x696e3234: // '42ni', little endian int24, MPlayer internal fourCC
  78        sh_audio->sample_format=AF_FORMAT_S24_LE;
  79        sh_audio->samplesize=3;
  80        break;
  81     case 0x32336e69: // 'in32', bigendian int32
  82        sh_audio->sample_format=AF_FORMAT_S32_BE;
  83        sh_audio->samplesize=4;
  84        break;
  85     case 0x696e3332: // '23ni', little endian int32, MPlayer internal fourCC
  86        sh_audio->sample_format=AF_FORMAT_S32_LE;
  87        sh_audio->samplesize=4;
  88        break;
  89     default: if(sh_audio->samplesize!=2) sh_audio->sample_format=AF_FORMAT_U8;
  90   }
  91   if (!sh_audio->samplesize) // this would cause MPlayer to hang later
  92     sh_audio->samplesize = 2;
  93   return 1;
  94 }
  95
  96 static int preinit(sh_audio_t *sh)
  97 {
  98   sh->audio_out_minsize=2048;
  99   return 1;
 100 }
 101
 102 static void uninit(sh_audio_t *sh)
 103 {
 104 }
 105
 106 static int control(sh_audio_t *sh,int cmd,void* arg, ...)
 107 {
 108   int skip;
 109     switch(cmd)
 110     {
 111       case ADCTRL_SKIP_FRAME:
 112         skip=sh->i_bps/16;
 113         skip=skip&(~3);
 114         demux_read_data(sh->ds,NULL,skip);
 115         return CONTROL_TRUE;
 116     }
 117   return CONTROL_UNKNOWN;
 118 }
 119
 120 static int decode_audio(sh_audio_t *sh_audio,unsigned char *buf,int minlen,int maxlen)
 121 {
 122   unsigned len = sh_audio->channels*sh_audio->samplesize;
 123   len = maxlen - maxlen % len; // sample align
 124   len=demux_read_data(sh_audio->ds,buf,len);
 125   return len;
 126 }