libmpcodecs/ad_pcm.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <unistd.h>
   4
   5 #include "talloc.h"
   6 #include "config.h"
   7 #include "ad_internal.h"
   8 #include "libaf/af_format.h"
   9 #include "libaf/reorder_ch.h"
  10
  11 static const ad_info_t info =
  12 {
  13         "Uncompressed PCM audio decoder",
  14         "pcm",
  15         "Nick Kurshev",
  16         "A'rpi",
  17         ""
  18 };
  19
  20 struct ad_pcm_context {
  21     unsigned char *packet_ptr;
  22     int packet_len;
  23 };
  24
  25 LIBAD_EXTERN(pcm)
  26
  27 static int init(sh_audio_t *sh_audio)
  28 {
  29   WAVEFORMATEX *h=sh_audio->wf;
  30   sh_audio->i_bps=h->nAvgBytesPerSec;
  31   sh_audio->channels=h->nChannels;
  32   sh_audio->samplerate=h->nSamplesPerSec;
  33   sh_audio->samplesize=(h->wBitsPerSample+7)/8;
  34   sh_audio->sample_format=AF_FORMAT_S16_LE; // default
  35   switch(sh_audio->format){ /* hardware formats: */
  36     case 0x0:
  37     case 0x1: // Microsoft PCM
  38     case 0xfffe: // Extended
  39        switch (sh_audio->samplesize) {
  40          case 1: sh_audio->sample_format=AF_FORMAT_U8; break;
  41          case 2: sh_audio->sample_format=AF_FORMAT_S16_LE; break;
  42          case 3: sh_audio->sample_format=AF_FORMAT_S24_LE; break;
  43          case 4: sh_audio->sample_format=AF_FORMAT_S32_LE; break;
  44        }
  45        break;
  46     case 0x3: // IEEE float
  47        sh_audio->sample_format=AF_FORMAT_FLOAT_LE;
  48        break;
  49     case 0x6:  sh_audio->sample_format=AF_FORMAT_A_LAW;break;
  50     case 0x7:  sh_audio->sample_format=AF_FORMAT_MU_LAW;break;
  51     case 0x11: sh_audio->sample_format=AF_FORMAT_IMA_ADPCM;break;
  52     case 0x50: sh_audio->sample_format=AF_FORMAT_MPEG2;break;
  53 /*    case 0x2000: sh_audio->sample_format=AFMT_AC3; */
  54     case 0x20776172: // 'raw '
  55        sh_audio->sample_format=AF_FORMAT_S16_BE;
  56        if(sh_audio->samplesize==1) sh_audio->sample_format=AF_FORMAT_U8;
  57        break;
  58     case 0x736F7774: // 'twos'
  59        sh_audio->sample_format=AF_FORMAT_S16_BE;
  60        // intended fall-through
  61     case 0x74776F73: // 'sowt'
  62        if(sh_audio->samplesize==1) sh_audio->sample_format=AF_FORMAT_S8;
  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   sh_audio->context = talloc_zero(NULL, struct ad_pcm_context);
 101   return 1;
 102 }
 103
 104 static int preinit(sh_audio_t *sh)
 105 {
 106   sh->audio_out_minsize=2048;
 107   return 1;
 108 }
 109
 110 static void uninit(sh_audio_t *sh)
 111 {
 112     talloc_free(sh->context);
 113 }
 114
 115 static int control(sh_audio_t *sh,int cmd,void* arg, ...)
 116 {
 117   int skip;
 118     switch(cmd)
 119     {
 120       case ADCTRL_SKIP_FRAME:
 121         skip=sh->i_bps/16;
 122         skip=skip&(~3);
 123         demux_read_data(sh->ds,NULL,skip);
 124         return CONTROL_TRUE;
 125     }
 126   return CONTROL_UNKNOWN;
 127 }
 128
 129 static int decode_audio(sh_audio_t *sh_audio,unsigned char *buf,int minlen,int maxlen)
 130 {
 131   unsigned len = sh_audio->channels*sh_audio->samplesize;
 132   minlen = (minlen + len - 1) / len * len;
 133   if (minlen > maxlen)
 134       // if someone needs hundreds of channels adjust audio_out_minsize
 135       // based on channels in preinit()
 136       return -1;
 137
 138   len = 0;
 139   struct ad_pcm_context *ctx = sh_audio->context;
 140   while (len < minlen) {
 141       if (ctx->packet_len == 0) {
 142           double pts;
 143           int plen = ds_get_packet_pts(sh_audio->ds, &ctx->packet_ptr, &pts);
 144           if (plen < 0)
 145               break;
 146           ctx->packet_len = plen;
 147           if (pts != MP_NOPTS_VALUE) {
 148               sh_audio->pts = pts;
 149               sh_audio->pts_bytes = 0;
 150           }
 151       }
 152       int from_stored = ctx->packet_len;
 153       if (from_stored > minlen - len)
 154           from_stored = minlen - len;
 155       memcpy(buf + len, ctx->packet_ptr, from_stored);
 156       ctx->packet_len -= from_stored;
 157       ctx->packet_ptr += from_stored;
 158       sh_audio->pts_bytes += from_stored;
 159       len += from_stored;
 160   }
 161   if (len == 0)
 162       len = -1;  // The loop above only exits at error/EOF
 163   if (len > 0 && sh_audio->channels >= 5) {
 164     reorder_channel_nch(buf, AF_CHANNEL_LAYOUT_WAVEEX_DEFAULT,
 165                         AF_CHANNEL_LAYOUT_MPLAYER_DEFAULT,
 166                         sh_audio->channels,
 167                         len / sh_audio->samplesize, sh_audio->samplesize);
 168   }
 169   return len;
 170 }