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 "talloc.h"
  24 #include "config.h"
  25 #include "ad_internal.h"
  26 #include "libaf/af_format.h"
  27 #include "libaf/reorder_ch.h"
  28
  29 static const ad_info_t info = {
  30     "Uncompressed PCM audio decoder",
  31     "pcm",
  32     "Nick Kurshev",
  33     "A'rpi",
  34     ""
  35 };
  36
  37 struct ad_pcm_context {
  38     unsigned char *packet_ptr;
  39     int packet_len;
  40 };
  41
  42 LIBAD_EXTERN(pcm)
  43
  44 static int init(sh_audio_t * sh_audio)
  45 {
  46     WAVEFORMATEX *h = sh_audio->wf;
  47     if (!h)
  48         return 0;
  49     sh_audio->i_bps = h->nAvgBytesPerSec;
  50     sh_audio->channels = h->nChannels;
  51     sh_audio->samplerate = h->nSamplesPerSec;
  52     sh_audio->samplesize = (h->wBitsPerSample + 7) / 8;
  53     sh_audio->sample_format = AF_FORMAT_S16_LE; // default
  54     switch (sh_audio->format) { /* hardware formats: */
  55     case 0x0:
  56     case 0x1:                  // Microsoft PCM
  57     case 0xfffe:               // Extended
  58         switch (sh_audio->samplesize) {
  59         case 1: sh_audio->sample_format = AF_FORMAT_U8;     break;
  60         case 2: sh_audio->sample_format = AF_FORMAT_S16_LE; break;
  61         case 3: sh_audio->sample_format = AF_FORMAT_S24_LE; break;
  62         case 4: sh_audio->sample_format = AF_FORMAT_S32_LE; break;
  63         }
  64         break;
  65     case 0x3:                  // IEEE float
  66         sh_audio->sample_format = AF_FORMAT_FLOAT_LE;
  67         break;
  68     case 0x6:  sh_audio->sample_format = AF_FORMAT_A_LAW;      break;
  69     case 0x7:  sh_audio->sample_format = AF_FORMAT_MU_LAW;     break;
  70     case 0x11: sh_audio->sample_format = AF_FORMAT_IMA_ADPCM;  break;
  71     case 0x50: sh_audio->sample_format = AF_FORMAT_MPEG2;      break;
  72 /*    case 0x2000: sh_audio->sample_format=AFMT_AC3; */
  73     case 0x20776172: // 'raw '
  74         sh_audio->sample_format = AF_FORMAT_S16_BE;
  75         if (sh_audio->samplesize == 1)
  76             sh_audio->sample_format = AF_FORMAT_U8;
  77         break;
  78     case 0x736F7774: // 'twos'
  79         sh_audio->sample_format = AF_FORMAT_S16_BE;
  80         // intended fall-through
  81     case 0x74776F73: // 'sowt'
  82         if (sh_audio->samplesize == 1)
  83             sh_audio->sample_format = AF_FORMAT_S8;
  84         break;
  85     case 0x32336c66: // 'fl32', bigendian float32
  86         sh_audio->sample_format = AF_FORMAT_FLOAT_BE;
  87         sh_audio->samplesize = 4;
  88         break;
  89     case 0x666c3332: // '23lf', little endian float32, MPlayer internal fourCC
  90         sh_audio->sample_format = AF_FORMAT_FLOAT_LE;
  91         sh_audio->samplesize = 4;
  92         break;
  93 /*    case 0x34366c66: // 'fl64', bigendian float64
  94        sh_audio->sample_format=AF_FORMAT_FLOAT_BE;
  95        sh_audio->samplesize=8;
  96        break;
  97     case 0x666c3634: // '46lf', little endian float64, MPlayer internal fourCC
  98        sh_audio->sample_format=AF_FORMAT_FLOAT_LE;
  99        sh_audio->samplesize=8;
 100        break;*/
 101     case 0x34326e69: // 'in24', bigendian int24
 102         sh_audio->sample_format = AF_FORMAT_S24_BE;
 103         sh_audio->samplesize = 3;
 104         break;
 105     case 0x696e3234: // '42ni', little endian int24, MPlayer internal fourCC
 106         sh_audio->sample_format = AF_FORMAT_S24_LE;
 107         sh_audio->samplesize = 3;
 108         break;
 109     case 0x32336e69: // 'in32', bigendian int32
 110         sh_audio->sample_format = AF_FORMAT_S32_BE;
 111         sh_audio->samplesize = 4;
 112         break;
 113     case 0x696e3332: // '23ni', little endian int32, MPlayer internal fourCC
 114         sh_audio->sample_format = AF_FORMAT_S32_LE;
 115         sh_audio->samplesize = 4;
 116         break;
 117     default:
 118         if (sh_audio->samplesize != 2)
 119             sh_audio->sample_format = AF_FORMAT_U8;
 120     }
 121     if (!sh_audio->samplesize)  // this would cause MPlayer to hang later
 122         sh_audio->samplesize = 2;
 123     sh_audio->context = talloc_zero(NULL, struct ad_pcm_context);
 124     return 1;
 125 }
 126
 127 static int preinit(sh_audio_t * sh)
 128 {
 129     sh->audio_out_minsize = 2048;
 130     return 1;
 131 }
 132
 133 static void uninit(sh_audio_t * sh)
 134 {
 135     talloc_free(sh->context);
 136 }
 137
 138 static int control(sh_audio_t * sh, int cmd, void *arg, ...)
 139 {
 140     int skip;
 141     switch (cmd) {
 142     case ADCTRL_SKIP_FRAME:
 143         skip = sh->i_bps / 16;
 144         skip = skip & (~3);
 145         demux_read_data(sh->ds, NULL, skip);
 146         return CONTROL_TRUE;
 147     }
 148     return CONTROL_UNKNOWN;
 149 }
 150
 151 static int decode_audio(sh_audio_t * sh_audio, unsigned char *buf, int minlen,
 152                         int maxlen)
 153 {
 154     int len = sh_audio->channels * sh_audio->samplesize;
 155     minlen = (minlen + len - 1) / len * len;
 156     if (minlen > maxlen)
 157         // if someone needs hundreds of channels adjust audio_out_minsize
 158         // based on channels in preinit()
 159         return -1;
 160
 161     len = 0;
 162     struct ad_pcm_context *ctx = sh_audio->context;
 163     while (len < minlen) {
 164         if (ctx->packet_len == 0) {
 165             double pts;
 166             int plen = ds_get_packet_pts(sh_audio->ds, &ctx->packet_ptr, &pts);
 167             if (plen < 0)
 168                 break;
 169             ctx->packet_len = plen;
 170             if (pts != MP_NOPTS_VALUE) {
 171                 sh_audio->pts = pts;
 172                 sh_audio->pts_bytes = 0;
 173             }
 174         }
 175         int from_stored = ctx->packet_len;
 176         if (from_stored > minlen - len)
 177             from_stored = minlen - len;
 178         memcpy(buf + len, ctx->packet_ptr, from_stored);
 179         ctx->packet_len -= from_stored;
 180         ctx->packet_ptr += from_stored;
 181         sh_audio->pts_bytes += from_stored;
 182         len += from_stored;
 183     }
 184     if (len == 0)
 185         len = -1;               // The loop above only exits at error/EOF
 186     if (len > 0 && sh_audio->channels >= 5) {
 187         reorder_channel_nch(buf, AF_CHANNEL_LAYOUT_WAVEEX_DEFAULT,
 188                             AF_CHANNEL_LAYOUT_MPLAYER_DEFAULT,
 189                             sh_audio->channels, len / sh_audio->samplesize,
 190                             sh_audio->samplesize);
 191     }
 192     return len;
 193 }