libmpcodecs/ad_pcm.c

   1 /*
   2  * This file is part of MPlayer.
   3  *
   4  * MPlayer is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * MPlayer is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along
  15  * with MPlayer; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  17  */
  18
  19 #include <stdio.h>
  20 #include <stdlib.h>
  21 #include <unistd.h>
  22
  23 #include "config.h"
  24 #include "ad_internal.h"
  25 #include "libaf/af_format.h"
  26 #include "libaf/reorder_ch.h"
  27
  28 static const ad_info_t info = {
  29     "Uncompressed PCM audio decoder",
  30     "pcm",
  31     "Nick Kurshev",
  32     "A'rpi",
  33     ""
  34 };
  35
  36 LIBAD_EXTERN(pcm)
  37
  38 static int init(sh_audio_t * sh_audio)
  39 {
  40     WAVEFORMATEX *h = sh_audio->wf;
  41     if (!h)
  42         return 0;
  43     sh_audio->i_bps = h->nAvgBytesPerSec;
  44     sh_audio->channels = h->nChannels;
  45     sh_audio->samplerate = h->nSamplesPerSec;
  46     sh_audio->samplesize = (h->wBitsPerSample + 7) / 8;
  47     sh_audio->sample_format = AF_FORMAT_S16_LE; // default
  48     switch (sh_audio->format) { /* hardware formats: */
  49     case 0x0:
  50     case 0x1:                  // Microsoft PCM
  51     case 0xfffe:               // Extended
  52         switch (sh_audio->samplesize) {
  53         case 1: sh_audio->sample_format = AF_FORMAT_U8;     break;
  54         case 2: sh_audio->sample_format = AF_FORMAT_S16_LE; break;
  55         case 3: sh_audio->sample_format = AF_FORMAT_S24_LE; break;
  56         case 4: sh_audio->sample_format = AF_FORMAT_S32_LE; break;
  57         }
  58         break;
  59     case 0x3:                  // IEEE float
  60         sh_audio->sample_format = AF_FORMAT_FLOAT_LE;
  61         break;
  62     case 0x6:  sh_audio->sample_format = AF_FORMAT_A_LAW;      break;
  63     case 0x7:  sh_audio->sample_format = AF_FORMAT_MU_LAW;     break;
  64     case 0x11: sh_audio->sample_format = AF_FORMAT_IMA_ADPCM;  break;
  65     case 0x50: sh_audio->sample_format = AF_FORMAT_MPEG2;      break;
  66 /*    case 0x2000: sh_audio->sample_format=AFMT_AC3; */
  67     case 0x20776172: // 'raw '
  68         sh_audio->sample_format = AF_FORMAT_S16_BE;
  69         if (sh_audio->samplesize == 1)
  70             sh_audio->sample_format = AF_FORMAT_U8;
  71         break;
  72     case 0x736F7774: // 'twos'
  73         sh_audio->sample_format = AF_FORMAT_S16_BE;
  74         // intended fall-through
  75     case 0x74776F73: // 'sowt'
  76         if (sh_audio->samplesize == 1)
  77             sh_audio->sample_format = AF_FORMAT_S8;
  78         break;
  79     case 0x32336c66: // 'fl32', bigendian float32
  80         sh_audio->sample_format = AF_FORMAT_FLOAT_BE;
  81         sh_audio->samplesize = 4;
  82         break;
  83     case 0x666c3332: // '23lf', little endian float32, MPlayer internal fourCC
  84         sh_audio->sample_format = AF_FORMAT_FLOAT_LE;
  85         sh_audio->samplesize = 4;
  86         break;
  87 /*    case 0x34366c66: // 'fl64', bigendian float64
  88        sh_audio->sample_format=AF_FORMAT_FLOAT_BE;
  89        sh_audio->samplesize=8;
  90        break;
  91     case 0x666c3634: // '46lf', little endian float64, MPlayer internal fourCC
  92        sh_audio->sample_format=AF_FORMAT_FLOAT_LE;
  93        sh_audio->samplesize=8;
  94        break;*/
  95     case 0x34326e69: // 'in24', bigendian int24
  96         sh_audio->sample_format = AF_FORMAT_S24_BE;
  97         sh_audio->samplesize = 3;
  98         break;
  99     case 0x696e3234: // '42ni', little endian int24, MPlayer internal fourCC
 100         sh_audio->sample_format = AF_FORMAT_S24_LE;
 101         sh_audio->samplesize = 3;
 102         break;
 103     case 0x32336e69: // 'in32', bigendian int32
 104         sh_audio->sample_format = AF_FORMAT_S32_BE;
 105         sh_audio->samplesize = 4;
 106         break;
 107     case 0x696e3332: // '23ni', little endian int32, MPlayer internal fourCC
 108         sh_audio->sample_format = AF_FORMAT_S32_LE;
 109         sh_audio->samplesize = 4;
 110         break;
 111     default:
 112         if (sh_audio->samplesize != 2)
 113             sh_audio->sample_format = AF_FORMAT_U8;
 114     }
 115     if (!sh_audio->samplesize)  // this would cause MPlayer to hang later
 116         sh_audio->samplesize = 2;
 117     return 1;
 118 }
 119
 120 static int preinit(sh_audio_t *sh)
 121 {
 122     sh->audio_out_minsize = 2048;
 123     return 1;
 124 }
 125
 126 static void uninit(sh_audio_t *sh)
 127 {
 128 }
 129
 130 static int control(sh_audio_t *sh, int cmd, void *arg, ...)
 131 {
 132     int skip;
 133     switch (cmd) {
 134     case ADCTRL_SKIP_FRAME:
 135         skip = sh->i_bps / 16;
 136         skip = skip & (~3);
 137         demux_read_data(sh->ds, NULL, skip);
 138         return CONTROL_TRUE;
 139     }
 140     return CONTROL_UNKNOWN;
 141 }
 142
 143 static int decode_audio(sh_audio_t *sh_audio, unsigned char *buf, int minlen,
 144                         int maxlen)
 145 {
 146     unsigned len = sh_audio->channels * sh_audio->samplesize;
 147     len = (minlen + len - 1) / len * len;
 148     if (len > maxlen)
 149         // if someone needs hundreds of channels adjust audio_out_minsize
 150         // based on channels in preinit()
 151         return -1;
 152     len = demux_read_data(sh_audio->ds, buf, len);
 153     if (len > 0 && sh_audio->channels >= 5) {
 154         reorder_channel_nch(buf, AF_CHANNEL_LAYOUT_WAVEEX_DEFAULT,
 155                             AF_CHANNEL_LAYOUT_MPLAYER_DEFAULT,
 156                             sh_audio->channels, len / sh_audio->samplesize,
 157                             sh_audio->samplesize);
 158     }
 159     return len;
 160 }