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 #include "libaf/reorder_ch.h"
   9
  10 static ad_info_t info =
  11 {
  12         "Uncompressed PCM audio decoder",
  13         "pcm",
  14         "Nick Kurshev",
  15         "A'rpi",
  16         ""
  17 };
  18
  19 LIBAD_EXTERN(pcm)
  20
  21 static int init(sh_audio_t *sh_audio)
  22 {
  23   WAVEFORMATEX *h=sh_audio->wf;
  24   sh_audio->i_bps=h->nAvgBytesPerSec;
  25   sh_audio->channels=h->nChannels;
  26   sh_audio->samplerate=h->nSamplesPerSec;
  27   sh_audio->samplesize=(h->wBitsPerSample+7)/8;
  28   sh_audio->sample_format=AF_FORMAT_S16_LE; // default
  29   switch(sh_audio->format){ /* hardware formats: */
  30     case 0x0:
  31     case 0x1: // Microsoft PCM
  32     case 0xfffe: // Extended
  33        switch (sh_audio->samplesize) {
  34          case 1: sh_audio->sample_format=AF_FORMAT_U8; break;
  35          case 2: sh_audio->sample_format=AF_FORMAT_S16_LE; break;
  36          case 3: sh_audio->sample_format=AF_FORMAT_S24_LE; break;
  37          case 4: sh_audio->sample_format=AF_FORMAT_S32_LE; break;
  38        }
  39        break;
  40     case 0x3: // IEEE float
  41        sh_audio->sample_format=AF_FORMAT_FLOAT_LE;
  42        break;
  43     case 0x6:  sh_audio->sample_format=AF_FORMAT_A_LAW;break;
  44     case 0x7:  sh_audio->sample_format=AF_FORMAT_MU_LAW;break;
  45     case 0x11: sh_audio->sample_format=AF_FORMAT_IMA_ADPCM;break;
  46     case 0x50: sh_audio->sample_format=AF_FORMAT_MPEG2;break;
  47 /*    case 0x2000: sh_audio->sample_format=AFMT_AC3; */
  48     case 0x20776172: // 'raw '
  49        sh_audio->sample_format=AF_FORMAT_S16_BE;
  50        if(sh_audio->samplesize==1) sh_audio->sample_format=AF_FORMAT_U8;
  51        break;
  52     case 0x736F7774: // 'twos'
  53        sh_audio->sample_format=AF_FORMAT_S16_BE;
  54        // intended fall-through
  55     case 0x74776F73: // 'sowt'
  56        if(sh_audio->samplesize==1) sh_audio->sample_format=AF_FORMAT_S8;
  57        break;
  58     case 0x32336c66: // 'fl32', bigendian float32
  59        sh_audio->sample_format=AF_FORMAT_FLOAT_BE;
  60        sh_audio->samplesize=4;
  61        break;
  62     case 0x666c3332: // '23lf', little endian float32, MPlayer internal fourCC
  63        sh_audio->sample_format=AF_FORMAT_FLOAT_LE;
  64        sh_audio->samplesize=4;
  65        break;
  66 /*    case 0x34366c66: // 'fl64', bigendian float64
  67        sh_audio->sample_format=AF_FORMAT_FLOAT_BE;
  68        sh_audio->samplesize=8;
  69        break;
  70     case 0x666c3634: // '46lf', little endian float64, MPlayer internal fourCC
  71        sh_audio->sample_format=AF_FORMAT_FLOAT_LE;
  72        sh_audio->samplesize=8;
  73        break;*/
  74     case 0x34326e69: // 'in24', bigendian int24
  75        sh_audio->sample_format=AF_FORMAT_S24_BE;
  76        sh_audio->samplesize=3;
  77        break;
  78     case 0x696e3234: // '42ni', little endian int24, MPlayer internal fourCC
  79        sh_audio->sample_format=AF_FORMAT_S24_LE;
  80        sh_audio->samplesize=3;
  81        break;
  82     case 0x32336e69: // 'in32', bigendian int32
  83        sh_audio->sample_format=AF_FORMAT_S32_BE;
  84        sh_audio->samplesize=4;
  85        break;
  86     case 0x696e3332: // '23ni', little endian int32, MPlayer internal fourCC
  87        sh_audio->sample_format=AF_FORMAT_S32_LE;
  88        sh_audio->samplesize=4;
  89        break;
  90     default: if(sh_audio->samplesize!=2) sh_audio->sample_format=AF_FORMAT_U8;
  91   }
  92   if (!sh_audio->samplesize) // this would cause MPlayer to hang later
  93     sh_audio->samplesize = 2;
  94   return 1;
  95 }
  96
  97 static int preinit(sh_audio_t *sh)
  98 {
  99   sh->audio_out_minsize=2048;
 100   return 1;
 101 }
 102
 103 static void uninit(sh_audio_t *sh)
 104 {
 105 }
 106
 107 static int control(sh_audio_t *sh,int cmd,void* arg, ...)
 108 {
 109   int skip;
 110     switch(cmd)
 111     {
 112       case ADCTRL_SKIP_FRAME:
 113         skip=sh->i_bps/16;
 114         skip=skip&(~3);
 115         demux_read_data(sh->ds,NULL,skip);
 116         return CONTROL_TRUE;
 117     }
 118   return CONTROL_UNKNOWN;
 119 }
 120
 121 static int decode_audio(sh_audio_t *sh_audio,unsigned char *buf,int minlen,int maxlen)
 122 {
 123   unsigned len = sh_audio->channels*sh_audio->samplesize;
 124   len = (minlen + len - 1) / len * len;
 125   if (len > maxlen)
 126       // if someone needs hundreds of channels adjust audio_out_minsize
 127       // based on channels in preinit()
 128       return -1;
 129   len=demux_read_data(sh_audio->ds,buf,len);
 130   if (len > 0 && sh_audio->channels >= 5) {
 131     reorder_channel_nch(buf, AF_CHANNEL_LAYOUT_WAVEEX_DEFAULT,
 132                         AF_CHANNEL_LAYOUT_MPLAYER_DEFAULT,
 133                         sh_audio->channels,
 134                         len / sh_audio->samplesize, sh_audio->samplesize);
 135   }
 136   return len;
 137 }