libmpcodecs/dec_audio.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <unistd.h>
   4 #include <assert.h>
   5
   6 #include "config.h"
   7 #include "mp_msg.h"
   8 #include "help_mp.h"
   9
  10 #include "stream/stream.h"
  11 #include "libmpdemux/demuxer.h"
  12
  13 #include "codec-cfg.h"
  14 #include "libmpdemux/stheader.h"
  15
  16 #include "dec_audio.h"
  17 #include "ad.h"
  18 #include "libaf/af_format.h"
  19
  20 #include "libaf/af.h"
  21
  22 #ifdef HAVE_MALLOC_H
  23 #include <malloc.h>
  24 #endif
  25
  26 #ifdef CONFIG_DYNAMIC_PLUGINS
  27 #include <dlfcn.h>
  28 #endif
  29
  30 #ifdef CONFIG_FAKE_MONO
  31 int fakemono = 0;
  32 #endif
  33
  34 /* used for ac3surround decoder - set using -channels option */
  35 int audio_output_channels = 2;
  36 af_cfg_t af_cfg = { 1, NULL };  // Configuration for audio filters
  37
  38 void afm_help(void)
  39 {
  40     int i;
  41     mp_msg(MSGT_DECAUDIO, MSGL_INFO, MSGTR_AvailableAudioFm);
  42     mp_msg(MSGT_IDENTIFY, MSGL_INFO, "ID_AUDIO_DRIVERS\n");
  43     mp_msg(MSGT_DECAUDIO, MSGL_INFO, "    afm:    info:  (comment)\n");
  44     for (i = 0; mpcodecs_ad_drivers[i] != NULL; i++)
  45         if (mpcodecs_ad_drivers[i]->info->comment
  46             && mpcodecs_ad_drivers[i]->info->comment[0])
  47             mp_msg(MSGT_DECAUDIO, MSGL_INFO, "%9s  %s (%s)\n",
  48                    mpcodecs_ad_drivers[i]->info->short_name,
  49                    mpcodecs_ad_drivers[i]->info->name,
  50                    mpcodecs_ad_drivers[i]->info->comment);
  51         else
  52             mp_msg(MSGT_DECAUDIO, MSGL_INFO, "%9s  %s\n",
  53                    mpcodecs_ad_drivers[i]->info->short_name,
  54                    mpcodecs_ad_drivers[i]->info->name);
  55 }
  56
  57 static int init_audio_codec(sh_audio_t *sh_audio)
  58 {
  59     if ((af_cfg.force & AF_INIT_FORMAT_MASK) == AF_INIT_FLOAT) {
  60         int fmt = AF_FORMAT_FLOAT_NE;
  61         if (sh_audio->ad_driver->control(sh_audio, ADCTRL_QUERY_FORMAT,
  62                                          &fmt) == CONTROL_TRUE) {
  63             sh_audio->sample_format = fmt;
  64             sh_audio->samplesize = 4;
  65         }
  66     }
  67     if (!sh_audio->ad_driver->preinit(sh_audio)) {
  68         mp_msg(MSGT_DECAUDIO, MSGL_ERR, MSGTR_ADecoderPreinitFailed);
  69         return 0;
  70     }
  71
  72     /* allocate audio in buffer: */
  73     if (sh_audio->audio_in_minsize > 0) {
  74         sh_audio->a_in_buffer_size = sh_audio->audio_in_minsize;
  75         mp_msg(MSGT_DECAUDIO, MSGL_V, MSGTR_AllocatingBytesForInputBuffer,
  76                sh_audio->a_in_buffer_size);
  77         sh_audio->a_in_buffer = av_mallocz(sh_audio->a_in_buffer_size);
  78         sh_audio->a_in_buffer_len = 0;
  79     }
  80
  81     sh_audio->a_buffer_size = sh_audio->audio_out_minsize + MAX_OUTBURST;
  82
  83     mp_msg(MSGT_DECAUDIO, MSGL_V, MSGTR_AllocatingBytesForOutputBuffer,
  84            sh_audio->audio_out_minsize, MAX_OUTBURST, sh_audio->a_buffer_size);
  85
  86     sh_audio->a_buffer = av_mallocz(sh_audio->a_buffer_size);
  87     if (!sh_audio->a_buffer) {
  88         mp_msg(MSGT_DECAUDIO, MSGL_ERR, MSGTR_CantAllocAudioBuf);
  89         return 0;
  90     }
  91     sh_audio->a_buffer_len = 0;
  92
  93     if (!sh_audio->ad_driver->init(sh_audio)) {
  94         mp_msg(MSGT_DECAUDIO, MSGL_WARN, MSGTR_ADecoderInitFailed);
  95         uninit_audio(sh_audio); // free buffers
  96         return 0;
  97     }
  98
  99     sh_audio->initialized = 1;
 100
 101     if (!sh_audio->channels || !sh_audio->samplerate) {
 102         mp_msg(MSGT_DECAUDIO, MSGL_WARN, MSGTR_UnknownAudio);
 103         uninit_audio(sh_audio); // free buffers
 104         return 0;
 105     }
 106
 107     if (!sh_audio->o_bps)
 108         sh_audio->o_bps = sh_audio->channels * sh_audio->samplerate
 109                           * sh_audio->samplesize;
 110
 111     mp_msg(MSGT_DECAUDIO, MSGL_INFO,
 112            "AUDIO: %d Hz, %d ch, %s, %3.1f kbit/%3.2f%% (ratio: %d->%d)\n",
 113            sh_audio->samplerate, sh_audio->channels,
 114            af_fmt2str_short(sh_audio->sample_format),
 115            sh_audio->i_bps * 8 * 0.001,
 116            ((float) sh_audio->i_bps / sh_audio->o_bps) * 100.0,
 117            sh_audio->i_bps, sh_audio->o_bps);
 118     mp_msg(MSGT_IDENTIFY, MSGL_INFO,
 119            "ID_AUDIO_BITRATE=%d\nID_AUDIO_RATE=%d\n" "ID_AUDIO_NCH=%d\n",
 120            sh_audio->i_bps * 8, sh_audio->samplerate, sh_audio->channels);
 121
 122     sh_audio->a_out_buffer_size = 0;
 123     sh_audio->a_out_buffer = NULL;
 124     sh_audio->a_out_buffer_len = 0;
 125
 126     return 1;
 127 }
 128
 129 static int init_audio(sh_audio_t *sh_audio, char *codecname, char *afm,
 130                       int status, stringset_t *selected)
 131 {
 132     unsigned int orig_fourcc = sh_audio->wf ? sh_audio->wf->wFormatTag : 0;
 133     int force = 0;
 134     if (codecname && codecname[0] == '+') {
 135         codecname = &codecname[1];
 136         force = 1;
 137     }
 138     sh_audio->codec = NULL;
 139     while (1) {
 140         ad_functions_t *mpadec;
 141         int i;
 142         sh_audio->ad_driver = 0;
 143         // restore original fourcc:
 144         if (sh_audio->wf)
 145             sh_audio->wf->wFormatTag = i = orig_fourcc;
 146         if (!(sh_audio->codec = find_audio_codec(sh_audio->format,
 147                                                  sh_audio->wf ? (&i) : NULL,
 148                                                  sh_audio->codec, force)))
 149             break;
 150         if (sh_audio->wf)
 151             sh_audio->wf->wFormatTag = i;
 152         // ok we found one codec
 153         if (stringset_test(selected, sh_audio->codec->name))
 154             continue;   // already tried & failed
 155         if (codecname && strcmp(sh_audio->codec->name, codecname))
 156             continue;   // -ac
 157         if (afm && strcmp(sh_audio->codec->drv, afm))
 158             continue;   // afm doesn't match
 159         if (!force && sh_audio->codec->status < status)
 160             continue;   // too unstable
 161         stringset_add(selected, sh_audio->codec->name); // tagging it
 162         // ok, it matches all rules, let's find the driver!
 163         for (i = 0; mpcodecs_ad_drivers[i] != NULL; i++)
 164             if (!strcmp(mpcodecs_ad_drivers[i]->info->short_name,
 165                  sh_audio->codec->drv))
 166                 break;
 167         mpadec = mpcodecs_ad_drivers[i];
 168 #ifdef CONFIG_DYNAMIC_PLUGINS
 169         if (!mpadec) {
 170             /* try to open shared decoder plugin */
 171             int buf_len;
 172             char *buf;
 173             ad_functions_t *funcs_sym;
 174             ad_info_t *info_sym;
 175
 176             buf_len =
 177                 strlen(MPLAYER_LIBDIR) + strlen(sh_audio->codec->drv) + 16;
 178             buf = malloc(buf_len);
 179             if (!buf)
 180                 break;
 181             snprintf(buf, buf_len, "%s/mplayer/ad_%s.so", MPLAYER_LIBDIR,
 182                      sh_audio->codec->drv);
 183             mp_msg(MSGT_DECAUDIO, MSGL_DBG2,
 184                    "Trying to open external plugin: %s\n", buf);
 185             sh_audio->dec_handle = dlopen(buf, RTLD_LAZY);
 186             if (!sh_audio->dec_handle)
 187                 break;
 188             snprintf(buf, buf_len, "mpcodecs_ad_%s", sh_audio->codec->drv);
 189             funcs_sym = dlsym(sh_audio->dec_handle, buf);
 190             if (!funcs_sym || !funcs_sym->info || !funcs_sym->preinit
 191                 || !funcs_sym->init || !funcs_sym->uninit
 192                 || !funcs_sym->control || !funcs_sym->decode_audio)
 193                 break;
 194             info_sym = funcs_sym->info;
 195             if (strcmp(info_sym->short_name, sh_audio->codec->drv))
 196                 break;
 197             free(buf);
 198             mpadec = funcs_sym;
 199             mp_msg(MSGT_DECAUDIO, MSGL_V,
 200                    "Using external decoder plugin (%s/mplayer/ad_%s.so)!\n",
 201                    MPLAYER_LIBDIR, sh_audio->codec->drv);
 202         }
 203 #endif
 204         if (!mpadec) {          // driver not available (==compiled in)
 205             mp_msg(MSGT_DECAUDIO, MSGL_ERR,
 206                    MSGTR_AudioCodecFamilyNotAvailableStr,
 207                    sh_audio->codec->name, sh_audio->codec->drv);
 208             continue;
 209         }
 210         // it's available, let's try to init!
 211         // init()
 212         mp_msg(MSGT_DECAUDIO, MSGL_INFO, MSGTR_OpeningAudioDecoder,
 213                mpadec->info->short_name, mpadec->info->name);
 214         sh_audio->ad_driver = mpadec;
 215         if (!init_audio_codec(sh_audio)) {
 216             mp_msg(MSGT_DECAUDIO, MSGL_INFO, MSGTR_ADecoderInitFailed);
 217             continue;           // try next...
 218         }
 219         // Yeah! We got it!
 220         return 1;
 221     }
 222     return 0;
 223 }
 224
 225 int init_best_audio_codec(sh_audio_t *sh_audio, char **audio_codec_list,
 226                           char **audio_fm_list)
 227 {
 228     stringset_t selected;
 229     char *ac_l_default[2] = { "", (char *) NULL };
 230     // hack:
 231     if (!audio_codec_list)
 232         audio_codec_list = ac_l_default;
 233     // Go through the codec.conf and find the best codec...
 234     sh_audio->initialized = 0;
 235     stringset_init(&selected);
 236     while (!sh_audio->initialized && *audio_codec_list) {
 237         char *audio_codec = *(audio_codec_list++);
 238         if (audio_codec[0]) {
 239             if (audio_codec[0] == '-') {
 240                 // disable this codec:
 241                 stringset_add(&selected, audio_codec + 1);
 242             } else {
 243                 // forced codec by name:
 244                 mp_msg(MSGT_DECAUDIO, MSGL_INFO, MSGTR_ForcedAudioCodec,
 245                        audio_codec);
 246                 init_audio(sh_audio, audio_codec, NULL, -1, &selected);
 247             }
 248         } else {
 249             int status;
 250             // try in stability order: UNTESTED, WORKING, BUGGY.
 251             // never try CRASHING.
 252             if (audio_fm_list) {
 253                 char **fmlist = audio_fm_list;
 254                 // try first the preferred codec families:
 255                 while (!sh_audio->initialized && *fmlist) {
 256                     char *audio_fm = *(fmlist++);
 257                     mp_msg(MSGT_DECAUDIO, MSGL_INFO, MSGTR_TryForceAudioFmtStr,
 258                            audio_fm);
 259                     for (status = CODECS_STATUS__MAX;
 260                          status >= CODECS_STATUS__MIN; --status)
 261                         if (init_audio(sh_audio, NULL, audio_fm, status, &selected))
 262                             break;
 263                 }
 264             }
 265             if (!sh_audio->initialized)
 266                 for (status = CODECS_STATUS__MAX; status >= CODECS_STATUS__MIN;
 267                      --status)
 268                     if (init_audio(sh_audio, NULL, NULL, status, &selected))
 269                         break;
 270         }
 271     }
 272     stringset_free(&selected);
 273
 274     if (!sh_audio->initialized) {
 275         mp_msg(MSGT_DECAUDIO, MSGL_ERR, MSGTR_CantFindAudioCodec,
 276                sh_audio->format);
 277         mp_msg(MSGT_DECAUDIO, MSGL_HINT, MSGTR_RTFMCodecs);
 278         return 0;   // failed
 279     }
 280
 281     mp_msg(MSGT_DECAUDIO, MSGL_INFO, MSGTR_SelectedAudioCodec,
 282            sh_audio->codec->name, sh_audio->codec->drv, sh_audio->codec->info);
 283     return 1;   // success
 284 }
 285
 286 void uninit_audio(sh_audio_t *sh_audio)
 287 {
 288     if (sh_audio->afilter) {
 289         mp_msg(MSGT_DECAUDIO, MSGL_V, "Uninit audio filters...\n");
 290         af_uninit(sh_audio->afilter);
 291         free(sh_audio->afilter);
 292         sh_audio->afilter = NULL;
 293     }
 294     if (sh_audio->initialized) {
 295         mp_msg(MSGT_DECAUDIO, MSGL_V, MSGTR_UninitAudioStr,
 296                sh_audio->codec->drv);
 297         sh_audio->ad_driver->uninit(sh_audio);
 298 #ifdef CONFIG_DYNAMIC_PLUGINS
 299         if (sh_audio->dec_handle)
 300             dlclose(sh_audio->dec_handle);
 301 #endif
 302         sh_audio->initialized = 0;
 303     }
 304     free(sh_audio->a_out_buffer);
 305     sh_audio->a_out_buffer = NULL;
 306     sh_audio->a_out_buffer_size = 0;
 307     av_freep(&sh_audio->a_buffer);
 308     av_freep(&sh_audio->a_in_buffer);
 309 }
 310
 311
 312 int init_audio_filters(sh_audio_t *sh_audio, int in_samplerate,
 313                        int *out_samplerate, int *out_channels, int *out_format)
 314 {
 315     af_stream_t *afs = sh_audio->afilter;
 316     if (!afs) {
 317         afs = malloc(sizeof(af_stream_t));
 318         memset(afs, 0, sizeof(af_stream_t));
 319     }
 320     // input format: same as codec's output format:
 321     afs->input.rate   = in_samplerate;
 322     afs->input.nch    = sh_audio->channels;
 323     afs->input.format = sh_audio->sample_format;
 324     af_fix_parameters(&(afs->input));
 325
 326     // output format: same as ao driver's input format (if missing, fallback to input)
 327     afs->output.rate   = *out_samplerate;
 328     afs->output.nch    = *out_channels;
 329     afs->output.format = *out_format;
 330     af_fix_parameters(&(afs->output));
 331
 332     // filter config:
 333     memcpy(&afs->cfg, &af_cfg, sizeof(af_cfg_t));
 334
 335     mp_msg(MSGT_DECAUDIO, MSGL_V, MSGTR_BuildingAudioFilterChain,
 336            afs->input.rate, afs->input.nch,
 337            af_fmt2str_short(afs->input.format), afs->output.rate,
 338            afs->output.nch, af_fmt2str_short(afs->output.format));
 339
 340     // let's autoprobe it!
 341     if (0 != af_init(afs)) {
 342         sh_audio->afilter = NULL;
 343         free(afs);
 344         return 0;   // failed :(
 345     }
 346
 347     *out_samplerate = afs->output.rate;
 348     *out_channels = afs->output.nch;
 349     *out_format = afs->output.format;
 350
 351     sh_audio->a_out_buffer_len = 0;
 352
 353     // ok!
 354     sh_audio->afilter = (void *) afs;
 355     return 1;
 356 }
 357
 358 static int filter_n_bytes(sh_audio_t *sh, int len)
 359 {
 360     int error = 0;
 361     // Filter
 362     af_data_t filter_input = {
 363         .audio = sh->a_buffer,
 364         .rate = sh->samplerate,
 365         .nch = sh->channels,
 366         .format = sh->sample_format
 367     };
 368     af_data_t *filter_output;
 369
 370     assert(len-1 + sh->audio_out_minsize <= sh->a_buffer_size);
 371
 372     // Decode more bytes if needed
 373     while (sh->a_buffer_len < len) {
 374         unsigned char *buf = sh->a_buffer + sh->a_buffer_len;
 375         int minlen = len - sh->a_buffer_len;
 376         int maxlen = sh->a_buffer_size - sh->a_buffer_len;
 377         int ret = sh->ad_driver->decode_audio(sh, buf, minlen, maxlen);
 378         if (ret <= 0) {
 379             error = -1;
 380             len = sh->a_buffer_len;
 381             break;
 382         }
 383         sh->a_buffer_len += ret;
 384     }
 385
 386     filter_input.len = len;
 387     af_fix_parameters(&filter_input);
 388     filter_output = af_play(sh->afilter, &filter_input);
 389     if (!filter_output)
 390         return -1;
 391     if (sh->a_out_buffer_size < sh->a_out_buffer_len + filter_output->len) {
 392         int newlen = sh->a_out_buffer_len + filter_output->len;
 393         mp_msg(MSGT_DECAUDIO, MSGL_V, "Increasing filtered audio buffer size "
 394                "from %d to %d\n", sh->a_out_buffer_size, newlen);
 395         sh->a_out_buffer = realloc(sh->a_out_buffer, newlen);
 396         sh->a_out_buffer_size = newlen;
 397     }
 398     memcpy(sh->a_out_buffer + sh->a_out_buffer_len, filter_output->audio,
 399            filter_output->len);
 400     sh->a_out_buffer_len += filter_output->len;
 401
 402     // remove processed data from decoder buffer:
 403     sh->a_buffer_len -= len;
 404     memmove(sh->a_buffer, sh->a_buffer + len, sh->a_buffer_len);
 405
 406     return error;
 407 }
 408
 409 /* Try to get at least minlen decoded+filtered bytes in sh_audio->a_out_buffer
 410  * (total length including possible existing data).
 411  * Return 0 on success, -1 on error/EOF (not distinguished).
 412  * In the former case sh_audio->a_out_buffer_len is always >= minlen
 413  * on return. In case of EOF/error it might or might not be.
 414  * Can reallocate sh_audio->a_out_buffer if needed to fit all filter output. */
 415 int decode_audio(sh_audio_t *sh_audio, int minlen)
 416 {
 417     // Indicates that a filter seems to be buffering large amounts of data
 418     int huge_filter_buffer = 0;
 419     // Decoded audio must be cut at boundaries of this many bytes
 420     int unitsize = sh_audio->channels * sh_audio->samplesize * 16;
 421
 422     /* Filter output size will be about filter_multiplier times input size.
 423      * If some filter buffers audio in big blocks this might only hold
 424      * as average over time. */
 425     double filter_multiplier = af_calc_filter_multiplier(sh_audio->afilter);
 426
 427     /* If the decoder set audio_out_minsize then it can do the equivalent of
 428      * "while (output_len < target_len) output_len += audio_out_minsize;",
 429      * so we must guarantee there is at least audio_out_minsize-1 bytes
 430      * more space in the output buffer than the minimum length we try to
 431      * decode. */
 432     int max_decode_len = sh_audio->a_buffer_size - sh_audio->audio_out_minsize;
 433     max_decode_len -= max_decode_len % unitsize;
 434
 435     while (sh_audio->a_out_buffer_len < minlen) {
 436         int declen = (minlen - sh_audio->a_out_buffer_len) / filter_multiplier
 437             + (unitsize << 5); // some extra for possible filter buffering
 438         if (huge_filter_buffer)
 439         /* Some filter must be doing significant buffering if the estimated
 440          * input length didn't produce enough output from filters.
 441          * Feed the filters 2k bytes at a time until we have enough output.
 442          * Very small amounts could make filtering inefficient while large
 443          * amounts can make MPlayer demux the file unnecessarily far ahead
 444          * to get audio data and buffer video frames in memory while doing
 445          * so. However the performance impact of either is probably not too
 446          * significant as long as the value is not completely insane. */
 447             declen = 2000;
 448         declen -= declen % unitsize;
 449         if (declen > max_decode_len)
 450             declen = max_decode_len;
 451         else
 452             /* if this iteration does not fill buffer, we must have lots
 453              * of buffering in filters */
 454             huge_filter_buffer = 1;
 455         if (filter_n_bytes(sh_audio, declen) < 0)
 456             return -1;
 457     }
 458     return 0;
 459 }
 460
 461 void resync_audio_stream(sh_audio_t *sh_audio)
 462 {
 463     sh_audio->a_in_buffer_len = 0;      // clear audio input buffer
 464     if (!sh_audio->initialized)
 465         return;
 466     sh_audio->ad_driver->control(sh_audio, ADCTRL_RESYNC_STREAM, NULL);
 467 }
 468
 469 void skip_audio_frame(sh_audio_t *sh_audio)
 470 {
 471     if (!sh_audio->initialized)
 472         return;
 473     if (sh_audio->ad_driver->control(sh_audio, ADCTRL_SKIP_FRAME, NULL) ==
 474         CONTROL_TRUE)
 475         return;
 476     // default skip code:
 477     ds_fill_buffer(sh_audio->ds);       // skip block
 478 }