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 #include <stdbool.h>
  23
  24 #include "talloc.h"
  25 #include "config.h"
  26 #include "ad_internal.h"
  27 #include "libaf/af_format.h"
  28 #include "libaf/reorder_ch.h"
  29
  30 static const ad_info_t info = {
  31     "Uncompressed PCM audio decoder",
  32     "pcm",
  33     "Nick Kurshev",
  34     "A'rpi",
  35     ""
  36 };
  37
  38 struct ad_pcm_context {
  39     unsigned char *buffer;
  40     int buffer_pos;
  41     int buffer_len;
  42     int buffer_size;
  43 };
  44
  45 LIBAD_EXTERN(pcm)
  46
  47 static int init(sh_audio_t * sh_audio)
  48 {
  49     WAVEFORMATEX *h = sh_audio->wf;
  50     if (!h)
  51         return 0;
  52     sh_audio->i_bps = h->nAvgBytesPerSec;
  53     sh_audio->channels = h->nChannels;
  54     sh_audio->samplerate = h->nSamplesPerSec;
  55     sh_audio->samplesize = (h->wBitsPerSample + 7) / 8;
  56     sh_audio->sample_format = AF_FORMAT_S16_LE; // default
  57     switch (sh_audio->format) { /* hardware formats: */
  58     case 0x0:
  59     case 0x1:                  // Microsoft PCM
  60     case 0xfffe:               // Extended
  61         switch (sh_audio->samplesize) {
  62         case 1: sh_audio->sample_format = AF_FORMAT_U8;     break;
  63         case 2: sh_audio->sample_format = AF_FORMAT_S16_LE; break;
  64         case 3: sh_audio->sample_format = AF_FORMAT_S24_LE; break;
  65         case 4: sh_audio->sample_format = AF_FORMAT_S32_LE; break;
  66         }
  67         break;
  68     case 0x3:                  // IEEE float
  69         sh_audio->sample_format = AF_FORMAT_FLOAT_LE;
  70         break;
  71     case 0x6:  sh_audio->sample_format = AF_FORMAT_A_LAW;      break;
  72     case 0x7:  sh_audio->sample_format = AF_FORMAT_MU_LAW;     break;
  73     case 0x11: sh_audio->sample_format = AF_FORMAT_IMA_ADPCM;  break;
  74     case 0x50: sh_audio->sample_format = AF_FORMAT_MPEG2;      break;
  75 /*    case 0x2000: sh_audio->sample_format=AFMT_AC3; */
  76     case 0x20776172: // 'raw '
  77         sh_audio->sample_format = AF_FORMAT_S16_BE;
  78         if (sh_audio->samplesize == 1)
  79             sh_audio->sample_format = AF_FORMAT_U8;
  80         break;
  81     case 0x736F7774: // 'twos'
  82         sh_audio->sample_format = AF_FORMAT_S16_BE;
  83         // intended fall-through
  84     case 0x74776F73: // 'sowt'
  85         if (sh_audio->samplesize == 1)
  86             sh_audio->sample_format = AF_FORMAT_S8;
  87         break;
  88     case 0x32336c66: // 'fl32', bigendian float32
  89         sh_audio->sample_format = AF_FORMAT_FLOAT_BE;
  90         sh_audio->samplesize = 4;
  91         break;
  92     case 0x666c3332: // '23lf', little endian float32, MPlayer internal fourCC
  93         sh_audio->sample_format = AF_FORMAT_FLOAT_LE;
  94         sh_audio->samplesize = 4;
  95         break;
  96 /*    case 0x34366c66: // 'fl64', bigendian float64
  97        sh_audio->sample_format=AF_FORMAT_FLOAT_BE;
  98        sh_audio->samplesize=8;
  99        break;
 100     case 0x666c3634: // '46lf', little endian float64, MPlayer internal fourCC
 101        sh_audio->sample_format=AF_FORMAT_FLOAT_LE;
 102        sh_audio->samplesize=8;
 103        break;*/
 104     case 0x34326e69: // 'in24', bigendian int24
 105         sh_audio->sample_format = AF_FORMAT_S24_BE;
 106         sh_audio->samplesize = 3;
 107         break;
 108     case 0x696e3234: // '42ni', little endian int24, MPlayer internal fourCC
 109         sh_audio->sample_format = AF_FORMAT_S24_LE;
 110         sh_audio->samplesize = 3;
 111         break;
 112     case 0x32336e69: // 'in32', bigendian int32
 113         sh_audio->sample_format = AF_FORMAT_S32_BE;
 114         sh_audio->samplesize = 4;
 115         break;
 116     case 0x696e3332: // '23ni', little endian int32, MPlayer internal fourCC
 117         sh_audio->sample_format = AF_FORMAT_S32_LE;
 118         sh_audio->samplesize = 4;
 119         break;
 120     default:
 121         if (sh_audio->samplesize != 2)
 122             sh_audio->sample_format = AF_FORMAT_U8;
 123     }
 124     if (!sh_audio->samplesize)  // this would cause MPlayer to hang later
 125         sh_audio->samplesize = 2;
 126     sh_audio->context = talloc_zero(NULL, struct ad_pcm_context);
 127     return 1;
 128 }
 129
 130 static int preinit(sh_audio_t *sh)
 131 {
 132     sh->audio_out_minsize = 2048;
 133     return 1;
 134 }
 135
 136 static void uninit(sh_audio_t *sh)
 137 {
 138     talloc_free(sh->context);
 139 }
 140
 141 static int control(sh_audio_t *sh, int cmd, void *arg, ...)
 142 {
 143     struct ad_pcm_context *ctx = sh->context;
 144     int skip;
 145     switch (cmd) {
 146     case ADCTRL_RESYNC_STREAM:
 147         ctx->buffer_len = 0;
 148         return true;
 149     case ADCTRL_SKIP_FRAME:
 150         skip = sh->i_bps / 16;
 151         skip = skip & (~3);
 152         demux_read_data(sh->ds, NULL, skip);
 153         return CONTROL_TRUE;
 154     }
 155     return CONTROL_UNKNOWN;
 156 }
 157
 158 static int decode_audio(sh_audio_t *sh_audio, unsigned char *buf, int minlen,
 159                         int maxlen)
 160 {
 161     int len = sh_audio->channels * sh_audio->samplesize;
 162     minlen = (minlen + len - 1) / len * len;
 163     if (minlen > maxlen)
 164         // if someone needs hundreds of channels adjust audio_out_minsize
 165         // based on channels in preinit()
 166         return -1;
 167
 168     len = 0;
 169     struct ad_pcm_context *ctx = sh_audio->context;
 170     while (len < minlen) {
 171         if (ctx->buffer_len - ctx->buffer_pos <= 0) {
 172             double pts;
 173             unsigned char *ptr;
 174             int plen = ds_get_packet_pts(sh_audio->ds, &ptr, &pts);
 175             if (plen < 0)
 176                 break;
 177             if (ctx->buffer_size < plen) {
 178                 talloc_free(ctx->buffer);
 179                 ctx->buffer = talloc_size(ctx, plen);
 180                 ctx->buffer_size = plen;
 181             }
 182             memcpy(ctx->buffer, ptr, plen);
 183             ctx->buffer_len = plen;
 184             ctx->buffer_pos = 0;
 185             if (pts != MP_NOPTS_VALUE) {
 186                 sh_audio->pts = pts;
 187                 sh_audio->pts_bytes = 0;
 188             }
 189         }
 190         int from_stored = ctx->buffer_len - ctx->buffer_pos;
 191         if (from_stored > minlen - len)
 192             from_stored = minlen - len;
 193         memcpy(buf + len, ctx->buffer + ctx->buffer_pos, from_stored);
 194         ctx->buffer_pos += from_stored;
 195         sh_audio->pts_bytes += from_stored;
 196         len += from_stored;
 197     }
 198     if (len == 0)
 199         len = -1;               // The loop above only exits at error/EOF
 200     if (len > 0 && sh_audio->channels >= 5) {
 201         reorder_channel_nch(buf, AF_CHANNEL_LAYOUT_WAVEEX_DEFAULT,
 202                             AF_CHANNEL_LAYOUT_MPLAYER_DEFAULT,
 203                             sh_audio->channels, len / sh_audio->samplesize,
 204                             sh_audio->samplesize);
 205     }
 206     return len;
 207 }