libmpcodecs/dec_audio.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 <assert.h>
  23
  24 #include "config.h"
  25 #include "mp_msg.h"
  26 #include "help_mp.h"
  27
  28 #include "stream/stream.h"
  29 #include "libmpdemux/demuxer.h"
  30
  31 #include "codec-cfg.h"
  32 #include "libmpdemux/stheader.h"
  33
  34 #include "dec_audio.h"
  35 #include "ad.h"
  36 #include "libaf/af_format.h"
  37
  38 #include "libaf/af.h"
  39
  40 #ifdef CONFIG_DYNAMIC_PLUGINS
  41 #include <dlfcn.h>
  42 #endif
  43
  44 #ifdef CONFIG_FAKE_MONO
  45 int fakemono = 0;
  46 #endif
  47
  48 /* used for ac3surround decoder - set using -channels option */
  49 int audio_output_channels = 2;
  50 af_cfg_t af_cfg = { 1, NULL };  // Configuration for audio filters
  51
  52 void afm_help(void)
  53 {
  54     int i;
  55     mp_tmsg(MSGT_DECAUDIO, MSGL_INFO, "Available (compiled-in) audio codec families/drivers:\n");
  56     mp_msg(MSGT_IDENTIFY, MSGL_INFO, "ID_AUDIO_DRIVERS\n");
  57     mp_msg(MSGT_DECAUDIO, MSGL_INFO, "    afm:    info:  (comment)\n");
  58     for (i = 0; mpcodecs_ad_drivers[i] != NULL; i++)
  59         if (mpcodecs_ad_drivers[i]->info->comment
  60             && mpcodecs_ad_drivers[i]->info->comment[0])
  61             mp_msg(MSGT_DECAUDIO, MSGL_INFO, "%9s  %s (%s)\n",
  62                    mpcodecs_ad_drivers[i]->info->short_name,
  63                    mpcodecs_ad_drivers[i]->info->name,
  64                    mpcodecs_ad_drivers[i]->info->comment);
  65         else
  66             mp_msg(MSGT_DECAUDIO, MSGL_INFO, "%9s  %s\n",
  67                    mpcodecs_ad_drivers[i]->info->short_name,
  68                    mpcodecs_ad_drivers[i]->info->name);
  69 }
  70
  71 static int init_audio_codec(sh_audio_t *sh_audio)
  72 {
  73     if ((af_cfg.force & AF_INIT_FORMAT_MASK) == AF_INIT_FLOAT) {
  74         int fmt = AF_FORMAT_FLOAT_NE;
  75         if (sh_audio->ad_driver->control(sh_audio, ADCTRL_QUERY_FORMAT,
  76                                          &fmt) == CONTROL_TRUE) {
  77             sh_audio->sample_format = fmt;
  78             sh_audio->samplesize = 4;
  79         }
  80     }
  81     if (!sh_audio->ad_driver->preinit(sh_audio)) {
  82         mp_tmsg(MSGT_DECAUDIO, MSGL_ERR, "ADecoder preinit failed :(\n");
  83         return 0;
  84     }
  85
  86     /* allocate audio in buffer: */
  87     if (sh_audio->audio_in_minsize > 0) {
  88         sh_audio->a_in_buffer_size = sh_audio->audio_in_minsize;
  89         mp_tmsg(MSGT_DECAUDIO, MSGL_V, "dec_audio: Allocating %d bytes for input buffer.\n",
  90                sh_audio->a_in_buffer_size);
  91         sh_audio->a_in_buffer = av_mallocz(sh_audio->a_in_buffer_size);
  92         sh_audio->a_in_buffer_len = 0;
  93     }
  94
  95     const int base_size = 65536;
  96     // At least 64 KiB plus rounding up to next decodable unit size
  97     sh_audio->a_buffer_size = base_size + sh_audio->audio_out_minsize;
  98
  99     mp_tmsg(MSGT_DECAUDIO, MSGL_V, "dec_audio: Allocating %d + %d = %d bytes for output buffer.\n",
 100            sh_audio->audio_out_minsize, base_size, sh_audio->a_buffer_size);
 101
 102     sh_audio->a_buffer = av_mallocz(sh_audio->a_buffer_size);
 103     if (!sh_audio->a_buffer) {
 104         mp_tmsg(MSGT_DECAUDIO, MSGL_ERR, "Cannot allocate audio out buffer.\n");
 105         return 0;
 106     }
 107     sh_audio->a_buffer_len = 0;
 108
 109     if (!sh_audio->ad_driver->init(sh_audio)) {
 110         mp_tmsg(MSGT_DECAUDIO, MSGL_WARN, "ADecoder init failed :(\n");
 111         uninit_audio(sh_audio); // free buffers
 112         return 0;
 113     }
 114
 115     sh_audio->initialized = 1;
 116
 117     if (!sh_audio->channels || !sh_audio->samplerate) {
 118         mp_tmsg(MSGT_DECAUDIO, MSGL_WARN, "Unknown/missing audio format -> no sound\n");
 119         uninit_audio(sh_audio); // free buffers
 120         return 0;
 121     }
 122
 123     if (!sh_audio->o_bps)
 124         sh_audio->o_bps = sh_audio->channels * sh_audio->samplerate
 125                           * sh_audio->samplesize;
 126
 127     mp_msg(MSGT_DECAUDIO, MSGL_INFO,
 128            "AUDIO: %d Hz, %d ch, %s, %3.1f kbit/%3.2f%% (ratio: %d->%d)\n",
 129            sh_audio->samplerate, sh_audio->channels,
 130            af_fmt2str_short(sh_audio->sample_format),
 131            sh_audio->i_bps * 8 * 0.001,
 132            ((float) sh_audio->i_bps / sh_audio->o_bps) * 100.0,
 133            sh_audio->i_bps, sh_audio->o_bps);
 134     mp_msg(MSGT_IDENTIFY, MSGL_INFO,
 135            "ID_AUDIO_BITRATE=%d\nID_AUDIO_RATE=%d\n" "ID_AUDIO_NCH=%d\n",
 136            sh_audio->i_bps * 8, sh_audio->samplerate, sh_audio->channels);
 137
 138     sh_audio->a_out_buffer_size = 0;
 139     sh_audio->a_out_buffer = NULL;
 140     sh_audio->a_out_buffer_len = 0;
 141
 142     return 1;
 143 }
 144
 145 static int init_audio(sh_audio_t *sh_audio, char *codecname, char *afm,
 146                       int status, stringset_t *selected)
 147 {
 148     unsigned int orig_fourcc = sh_audio->wf ? sh_audio->wf->wFormatTag : 0;
 149     int force = 0;
 150     if (codecname && codecname[0] == '+') {
 151         codecname = &codecname[1];
 152         force = 1;
 153     }
 154     sh_audio->codec = NULL;
 155     while (1) {
 156         ad_functions_t *mpadec;
 157         int i;
 158         sh_audio->ad_driver = 0;
 159         // restore original fourcc:
 160         if (sh_audio->wf)
 161             sh_audio->wf->wFormatTag = i = orig_fourcc;
 162         if (!(sh_audio->codec = find_audio_codec(sh_audio->format,
 163                                                  sh_audio->wf ? (&i) : NULL,
 164                                                  sh_audio->codec, force)))
 165             break;
 166         if (sh_audio->wf)
 167             sh_audio->wf->wFormatTag = i;
 168         // ok we found one codec
 169         if (stringset_test(selected, sh_audio->codec->name))
 170             continue;   // already tried & failed
 171         if (codecname && strcmp(sh_audio->codec->name, codecname))
 172             continue;   // -ac
 173         if (afm && strcmp(sh_audio->codec->drv, afm))
 174             continue;   // afm doesn't match
 175         if (!force && sh_audio->codec->status < status)
 176             continue;   // too unstable
 177         stringset_add(selected, sh_audio->codec->name); // tagging it
 178         // ok, it matches all rules, let's find the driver!
 179         for (i = 0; mpcodecs_ad_drivers[i] != NULL; i++)
 180             if (!strcmp(mpcodecs_ad_drivers[i]->info->short_name,
 181                  sh_audio->codec->drv))
 182                 break;
 183         mpadec = mpcodecs_ad_drivers[i];
 184 #ifdef CONFIG_DYNAMIC_PLUGINS
 185         if (!mpadec) {
 186             /* try to open shared decoder plugin */
 187             int buf_len;
 188             char *buf;
 189             ad_functions_t *funcs_sym;
 190             ad_info_t *info_sym;
 191
 192             buf_len =
 193                 strlen(MPLAYER_LIBDIR) + strlen(sh_audio->codec->drv) + 16;
 194             buf = malloc(buf_len);
 195             if (!buf)
 196                 break;
 197             snprintf(buf, buf_len, "%s/mplayer/ad_%s.so", MPLAYER_LIBDIR,
 198                      sh_audio->codec->drv);
 199             mp_msg(MSGT_DECAUDIO, MSGL_DBG2,
 200                    "Trying to open external plugin: %s\n", buf);
 201             sh_audio->dec_handle = dlopen(buf, RTLD_LAZY);
 202             if (!sh_audio->dec_handle)
 203                 break;
 204             snprintf(buf, buf_len, "mpcodecs_ad_%s", sh_audio->codec->drv);
 205             funcs_sym = dlsym(sh_audio->dec_handle, buf);
 206             if (!funcs_sym || !funcs_sym->info || !funcs_sym->preinit
 207                 || !funcs_sym->init || !funcs_sym->uninit
 208                 || !funcs_sym->control || !funcs_sym->decode_audio)
 209                 break;
 210             info_sym = funcs_sym->info;
 211             if (strcmp(info_sym->short_name, sh_audio->codec->drv))
 212                 break;
 213             free(buf);
 214             mpadec = funcs_sym;
 215             mp_msg(MSGT_DECAUDIO, MSGL_V,
 216                    "Using external decoder plugin (%s/mplayer/ad_%s.so)!\n",
 217                    MPLAYER_LIBDIR, sh_audio->codec->drv);
 218         }
 219 #endif
 220         if (!mpadec) {          // driver not available (==compiled in)
 221             mp_tmsg(MSGT_DECAUDIO, MSGL_ERR,
 222                    "Requested audio codec family [%s] (afm=%s) not available.\nEnable it at compilation.\n",
 223                    sh_audio->codec->name, sh_audio->codec->drv);
 224             continue;
 225         }
 226         // it's available, let's try to init!
 227         // init()
 228         mp_tmsg(MSGT_DECAUDIO, MSGL_INFO, "Opening audio decoder: [%s] %s\n",
 229                mpadec->info->short_name, mpadec->info->name);
 230         sh_audio->ad_driver = mpadec;
 231         if (!init_audio_codec(sh_audio)) {
 232             mp_tmsg(MSGT_DECAUDIO, MSGL_INFO, "ADecoder init failed :(\n");
 233             continue;           // try next...
 234         }
 235         // Yeah! We got it!
 236         return 1;
 237     }
 238     return 0;
 239 }
 240
 241 int init_best_audio_codec(sh_audio_t *sh_audio, char **audio_codec_list,
 242                           char **audio_fm_list)
 243 {
 244     stringset_t selected;
 245     char *ac_l_default[2] = { "", (char *) NULL };
 246     // hack:
 247     if (!audio_codec_list)
 248         audio_codec_list = ac_l_default;
 249     // Go through the codec.conf and find the best codec...
 250     sh_audio->initialized = 0;
 251     stringset_init(&selected);
 252     while (!sh_audio->initialized && *audio_codec_list) {
 253         char *audio_codec = *(audio_codec_list++);
 254         if (audio_codec[0]) {
 255             if (audio_codec[0] == '-') {
 256                 // disable this codec:
 257                 stringset_add(&selected, audio_codec + 1);
 258             } else {
 259                 // forced codec by name:
 260                 mp_tmsg(MSGT_DECAUDIO, MSGL_INFO, "Forced audio codec: %s\n",
 261                        audio_codec);
 262                 init_audio(sh_audio, audio_codec, NULL, -1, &selected);
 263             }
 264         } else {
 265             int status;
 266             // try in stability order: UNTESTED, WORKING, BUGGY.
 267             // never try CRASHING.
 268             if (audio_fm_list) {
 269                 char **fmlist = audio_fm_list;
 270                 // try first the preferred codec families:
 271                 while (!sh_audio->initialized && *fmlist) {
 272                     char *audio_fm = *(fmlist++);
 273                     mp_tmsg(MSGT_DECAUDIO, MSGL_INFO, "Trying to force audio codec driver family %s...\n",
 274                            audio_fm);
 275                     for (status = CODECS_STATUS__MAX;
 276                          status >= CODECS_STATUS__MIN; --status)
 277                         if (init_audio(sh_audio, NULL, audio_fm, status, &selected))
 278                             break;
 279                 }
 280             }
 281             if (!sh_audio->initialized)
 282                 for (status = CODECS_STATUS__MAX; status >= CODECS_STATUS__MIN;
 283                      --status)
 284                     if (init_audio(sh_audio, NULL, NULL, status, &selected))
 285                         break;
 286         }
 287     }
 288     stringset_free(&selected);
 289
 290     if (!sh_audio->initialized) {
 291         mp_tmsg(MSGT_DECAUDIO, MSGL_ERR, "Cannot find codec for audio format 0x%X.\n",
 292                sh_audio->format);
 293         return 0;   // failed
 294     }
 295
 296     mp_tmsg(MSGT_DECAUDIO, MSGL_INFO, "Selected audio codec: [%s] afm: %s (%s)\n",
 297            sh_audio->codec->name, sh_audio->codec->drv, sh_audio->codec->info);
 298     return 1;   // success
 299 }
 300
 301 void uninit_audio(sh_audio_t *sh_audio)
 302 {
 303     if (sh_audio->afilter) {
 304         mp_msg(MSGT_DECAUDIO, MSGL_V, "Uninit audio filters...\n");
 305         af_uninit(sh_audio->afilter);
 306         free(sh_audio->afilter);
 307         sh_audio->afilter = NULL;
 308     }
 309     if (sh_audio->initialized) {
 310         mp_tmsg(MSGT_DECAUDIO, MSGL_V, "Uninit audio: %s\n",
 311                sh_audio->codec->drv);
 312         sh_audio->ad_driver->uninit(sh_audio);
 313 #ifdef CONFIG_DYNAMIC_PLUGINS
 314         if (sh_audio->dec_handle)
 315             dlclose(sh_audio->dec_handle);
 316 #endif
 317         sh_audio->initialized = 0;
 318     }
 319     free(sh_audio->a_out_buffer);
 320     sh_audio->a_out_buffer = NULL;
 321     sh_audio->a_out_buffer_size = 0;
 322     av_freep(&sh_audio->a_buffer);
 323     av_freep(&sh_audio->a_in_buffer);
 324 }
 325
 326
 327 int init_audio_filters(sh_audio_t *sh_audio, int in_samplerate,
 328                        int *out_samplerate, int *out_channels, int *out_format)
 329 {
 330     af_stream_t *afs = sh_audio->afilter;
 331     if (!afs) {
 332         afs = malloc(sizeof(af_stream_t));
 333         memset(afs, 0, sizeof(af_stream_t));
 334     }
 335     // input format: same as codec's output format:
 336     afs->input.rate   = in_samplerate;
 337     afs->input.nch    = sh_audio->channels;
 338     afs->input.format = sh_audio->sample_format;
 339     af_fix_parameters(&(afs->input));
 340
 341     // output format: same as ao driver's input format (if missing, fallback to input)
 342     afs->output.rate   = *out_samplerate;
 343     afs->output.nch    = *out_channels;
 344     afs->output.format = *out_format;
 345     af_fix_parameters(&(afs->output));
 346
 347     // filter config:
 348     memcpy(&afs->cfg, &af_cfg, sizeof(af_cfg_t));
 349
 350     mp_tmsg(MSGT_DECAUDIO, MSGL_V, "Building audio filter chain for %dHz/%dch/%s -> %dHz/%dch/%s...\n",
 351            afs->input.rate, afs->input.nch,
 352            af_fmt2str_short(afs->input.format), afs->output.rate,
 353            afs->output.nch, af_fmt2str_short(afs->output.format));
 354
 355     // let's autoprobe it!
 356     if (0 != af_init(afs)) {
 357         sh_audio->afilter = NULL;
 358         free(afs);
 359         return 0;   // failed :(
 360     }
 361
 362     *out_samplerate = afs->output.rate;
 363     *out_channels = afs->output.nch;
 364     *out_format = afs->output.format;
 365
 366     sh_audio->a_out_buffer_len = 0;
 367
 368     // ok!
 369     sh_audio->afilter = (void *) afs;
 370     return 1;
 371 }
 372
 373 static int filter_n_bytes(sh_audio_t *sh, int len)
 374 {
 375     assert(len-1 + sh->audio_out_minsize <= sh->a_buffer_size);
 376
 377     int error = 0;
 378
 379     // Decode more bytes if needed
 380     while (sh->a_buffer_len < len) {
 381         unsigned char *buf = sh->a_buffer + sh->a_buffer_len;
 382         int minlen = len - sh->a_buffer_len;
 383         int maxlen = sh->a_buffer_size - sh->a_buffer_len;
 384         int ret = sh->ad_driver->decode_audio(sh, buf, minlen, maxlen);
 385         if (ret <= 0) {
 386             error = -1;
 387             len = sh->a_buffer_len;
 388             break;
 389         }
 390         sh->a_buffer_len += ret;
 391     }
 392
 393     // Filter
 394     af_data_t filter_input = {
 395         .audio = sh->a_buffer,
 396         .len = len,
 397         .rate = sh->samplerate,
 398         .nch = sh->channels,
 399         .format = sh->sample_format
 400     };
 401     af_fix_parameters(&filter_input);
 402     af_data_t *filter_output = af_play(sh->afilter, &filter_input);
 403     if (!filter_output)
 404         return -1;
 405     if (sh->a_out_buffer_size < sh->a_out_buffer_len + filter_output->len) {
 406         int newlen = sh->a_out_buffer_len + filter_output->len;
 407         mp_msg(MSGT_DECAUDIO, MSGL_V, "Increasing filtered audio buffer size "
 408                "from %d to %d\n", sh->a_out_buffer_size, newlen);
 409         sh->a_out_buffer = realloc(sh->a_out_buffer, newlen);
 410         sh->a_out_buffer_size = newlen;
 411     }
 412     memcpy(sh->a_out_buffer + sh->a_out_buffer_len, filter_output->audio,
 413            filter_output->len);
 414     sh->a_out_buffer_len += filter_output->len;
 415
 416     // remove processed data from decoder buffer:
 417     sh->a_buffer_len -= len;
 418     memmove(sh->a_buffer, sh->a_buffer + len, sh->a_buffer_len);
 419
 420     return error;
 421 }
 422
 423 /* Try to get at least minlen decoded+filtered bytes in sh_audio->a_out_buffer
 424  * (total length including possible existing data).
 425  * Return 0 on success, -1 on error/EOF (not distinguished).
 426  * In the former case sh_audio->a_out_buffer_len is always >= minlen
 427  * on return. In case of EOF/error it might or might not be.
 428  * Can reallocate sh_audio->a_out_buffer if needed to fit all filter output. */
 429 int decode_audio(sh_audio_t *sh_audio, int minlen)
 430 {
 431     // Indicates that a filter seems to be buffering large amounts of data
 432     int huge_filter_buffer = 0;
 433     // Decoded audio must be cut at boundaries of this many bytes
 434     int unitsize = sh_audio->channels * sh_audio->samplesize * 16;
 435
 436     /* Filter output size will be about filter_multiplier times input size.
 437      * If some filter buffers audio in big blocks this might only hold
 438      * as average over time. */
 439     double filter_multiplier = af_calc_filter_multiplier(sh_audio->afilter);
 440
 441     /* If the decoder set audio_out_minsize then it can do the equivalent of
 442      * "while (output_len < target_len) output_len += audio_out_minsize;",
 443      * so we must guarantee there is at least audio_out_minsize-1 bytes
 444      * more space in the output buffer than the minimum length we try to
 445      * decode. */
 446     int max_decode_len = sh_audio->a_buffer_size - sh_audio->audio_out_minsize;
 447     max_decode_len -= max_decode_len % unitsize;
 448
 449     while (sh_audio->a_out_buffer_len < minlen) {
 450         int declen = (minlen - sh_audio->a_out_buffer_len) / filter_multiplier
 451             + (unitsize << 5); // some extra for possible filter buffering
 452         if (huge_filter_buffer)
 453         /* Some filter must be doing significant buffering if the estimated
 454          * input length didn't produce enough output from filters.
 455          * Feed the filters 2k bytes at a time until we have enough output.
 456          * Very small amounts could make filtering inefficient while large
 457          * amounts can make MPlayer demux the file unnecessarily far ahead
 458          * to get audio data and buffer video frames in memory while doing
 459          * so. However the performance impact of either is probably not too
 460          * significant as long as the value is not completely insane. */
 461             declen = 2000;
 462         declen -= declen % unitsize;
 463         if (declen > max_decode_len)
 464             declen = max_decode_len;
 465         else
 466             /* if this iteration does not fill buffer, we must have lots
 467              * of buffering in filters */
 468             huge_filter_buffer = 1;
 469         if (filter_n_bytes(sh_audio, declen) < 0)
 470             return -1;
 471     }
 472     return 0;
 473 }
 474
 475 void resync_audio_stream(sh_audio_t *sh_audio)
 476 {
 477     sh_audio->a_in_buffer_len = 0;      // clear audio input buffer
 478     if (!sh_audio->initialized)
 479         return;
 480     sh_audio->ad_driver->control(sh_audio, ADCTRL_RESYNC_STREAM, NULL);
 481 }
 482
 483 void skip_audio_frame(sh_audio_t *sh_audio)
 484 {
 485     if (!sh_audio->initialized)
 486         return;
 487     if (sh_audio->ad_driver->control(sh_audio, ADCTRL_SKIP_FRAME, NULL) ==
 488         CONTROL_TRUE)
 489         return;
 490     // default skip code:
 491     ds_fill_buffer(sh_audio->ds);       // skip block
 492 }