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 // Uncomment this if twos audio is broken for you
  57 // (typically with movies made on sgi machines)
  58 // This is just a workaround, the real bug is elsewhere
  59 #if 0
  60        sh_audio->ds->ss_div= sh_audio->samplesize;
  61        sh_audio->ds->ss_mul= sh_audio->samplesize * sh_audio->channels;
  62 #endif
  63        break;
  64     case 0x32336c66: // 'fl32', bigendian float32
  65        sh_audio->sample_format=AF_FORMAT_FLOAT_BE;
  66        sh_audio->samplesize=4;
  67        break;
  68     case 0x666c3332: // '23lf', little endian float32, MPlayer internal fourCC
  69        sh_audio->sample_format=AF_FORMAT_FLOAT_LE;
  70        sh_audio->samplesize=4;
  71        break;
  72 /*    case 0x34366c66: // 'fl64', bigendian float64
  73        sh_audio->sample_format=AF_FORMAT_FLOAT_BE;
  74        sh_audio->samplesize=8;
  75        break;
  76     case 0x666c3634: // '46lf', little endian float64, MPlayer internal fourCC
  77        sh_audio->sample_format=AF_FORMAT_FLOAT_LE;
  78        sh_audio->samplesize=8;
  79        break;*/
  80     case 0x34326e69: // 'in24', bigendian int24
  81        sh_audio->sample_format=AF_FORMAT_S24_BE;
  82        sh_audio->samplesize=3;
  83        break;
  84     case 0x696e3234: // '42ni', little endian int24, MPlayer internal fourCC
  85        sh_audio->sample_format=AF_FORMAT_S24_LE;
  86        sh_audio->samplesize=3;
  87        break;
  88     case 0x32336e69: // 'in32', bigendian int32
  89        sh_audio->sample_format=AF_FORMAT_S32_BE;
  90        sh_audio->samplesize=4;
  91        break;
  92     case 0x696e3332: // '23ni', little endian int32, MPlayer internal fourCC
  93        sh_audio->sample_format=AF_FORMAT_S32_LE;
  94        sh_audio->samplesize=4;
  95        break;
  96     default: if(sh_audio->samplesize!=2) sh_audio->sample_format=AF_FORMAT_U8;
  97   }
  98   if (!sh_audio->samplesize) // this would cause MPlayer to hang later
  99     sh_audio->samplesize = 2;
 100   return 1;
 101 }
 102
 103 static int preinit(sh_audio_t *sh)
 104 {
 105   sh->audio_out_minsize=2048;
 106   return 1;
 107 }
 108
 109 static void uninit(sh_audio_t *sh)
 110 {
 111 }
 112
 113 static int control(sh_audio_t *sh,int cmd,void* arg, ...)
 114 {
 115   int skip;
 116     switch(cmd)
 117     {
 118       case ADCTRL_SKIP_FRAME:
 119         skip=sh->i_bps/16;
 120         skip=skip&(~3);
 121         demux_read_data(sh->ds,NULL,skip);
 122         return CONTROL_TRUE;
 123     }
 124   return CONTROL_UNKNOWN;
 125 }
 126
 127 static int decode_audio(sh_audio_t *sh_audio,unsigned char *buf,int minlen,int maxlen)
 128 {
 129   unsigned len = sh_audio->channels*sh_audio->samplesize;
 130   len = maxlen - maxlen % len; // sample align
 131   len=demux_read_data(sh_audio->ds,buf,len);
 132   return len;
 133 }