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
  27 #include "stream/stream.h"
  28 #include "libmpdemux/demuxer.h"
  29
  30 #include "codec-cfg.h"
  31 #include "libmpdemux/stheader.h"
  32
  33 #include "dec_audio.h"
  34 #include "ad.h"
  35 #include "libaf/af_format.h"
  36
  37 #include "libaf/af.h"
  38
  39 #ifdef CONFIG_DYNAMIC_PLUGINS
  40 #include <dlfcn.h>
  41 #endif
  42
  43 #ifdef CONFIG_FAKE_MONO
  44 int fakemono = 0;
  45 #endif
  46
  47 af_cfg_t af_cfg = { 1, NULL };  // Configuration for audio filters
  48
  49 void afm_help(void)
  50 {
  51     int i;
  52     mp_tmsg(MSGT_DECAUDIO, MSGL_INFO, "Available (compiled-in) audio codec families/drivers:\n");
  53     mp_msg(MSGT_IDENTIFY, MSGL_INFO, "ID_AUDIO_DRIVERS\n");
  54     mp_msg(MSGT_DECAUDIO, MSGL_INFO, "    afm:    info:  (comment)\n");
  55     for (i = 0; mpcodecs_ad_drivers[i] != NULL; i++)
  56         if (mpcodecs_ad_drivers[i]->info->comment
  57             && mpcodecs_ad_drivers[i]->info->comment[0])
  58             mp_msg(MSGT_DECAUDIO, MSGL_INFO, "%9s  %s (%s)\n",
  59                    mpcodecs_ad_drivers[i]->info->short_name,
  60                    mpcodecs_ad_drivers[i]->info->name,
  61                    mpcodecs_ad_drivers[i]->info->comment);
  62         else
  63             mp_msg(MSGT_DECAUDIO, MSGL_INFO, "%9s  %s\n",
  64                    mpcodecs_ad_drivers[i]->info->short_name,
  65                    mpcodecs_ad_drivers[i]->info->name);
  66 }
  67
  68 static int init_audio_codec(sh_audio_t *sh_audio)
  69 {
  70     assert(!sh_audio->initialized);
  71     resync_audio_stream(sh_audio);
  72     if ((af_cfg.force & AF_INIT_FORMAT_MASK) == AF_INIT_FLOAT) {
  73         int fmt = AF_FORMAT_FLOAT_NE;
  74         if (sh_audio->ad_driver->control(sh_audio, ADCTRL_QUERY_FORMAT,
  75                                          &fmt) == CONTROL_TRUE) {
  76             sh_audio->sample_format = fmt;
  77             sh_audio->samplesize = 4;
  78         }
  79     }
  80     sh_audio->audio_out_minsize = 8192; // default, preinit() may change it
  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     }
  93
  94     const int base_size = 65536;
  95     // At least 64 KiB plus rounding up to next decodable unit size
  96     sh_audio->a_buffer_size = base_size + sh_audio->audio_out_minsize;
  97
  98     mp_tmsg(MSGT_DECAUDIO, MSGL_V, "dec_audio: Allocating %d + %d = %d bytes for output buffer.\n",
  99            sh_audio->audio_out_minsize, base_size, sh_audio->a_buffer_size);
 100
 101     sh_audio->a_buffer = av_mallocz(sh_audio->a_buffer_size);
 102     if (!sh_audio->a_buffer) {
 103         mp_tmsg(MSGT_DECAUDIO, MSGL_ERR, "Cannot allocate audio out buffer.\n");
 104         return 0;
 105     }
 106     sh_audio->a_buffer_len = 0;
 107
 108     if (!sh_audio->ad_driver->init(sh_audio)) {
 109         mp_tmsg(MSGT_DECAUDIO, MSGL_WARN, "ADecoder init failed :(\n");
 110         uninit_audio(sh_audio); // free buffers
 111         return 0;
 112     }
 113
 114     sh_audio->initialized = 1;
 115
 116     if (!sh_audio->channels || !sh_audio->samplerate) {
 117         mp_tmsg(MSGT_DECAUDIO, MSGL_WARN, "Unknown/missing audio format -> no sound\n");
 118         uninit_audio(sh_audio); // free buffers
 119         return 0;
 120     }
 121
 122     if (!sh_audio->o_bps)
 123         sh_audio->o_bps = sh_audio->channels * sh_audio->samplerate
 124                           * sh_audio->samplesize;
 125
 126     mp_msg(MSGT_DECAUDIO, MSGL_INFO,
 127            "AUDIO: %d Hz, %d ch, %s, %3.1f kbit/%3.2f%% (ratio: %d->%d)\n",
 128            sh_audio->samplerate, sh_audio->channels,
 129            af_fmt2str_short(sh_audio->sample_format),
 130            sh_audio->i_bps * 8 * 0.001,
 131            ((float) sh_audio->i_bps / sh_audio->o_bps) * 100.0,
 132            sh_audio->i_bps, sh_audio->o_bps);
 133     mp_msg(MSGT_IDENTIFY, MSGL_INFO,
 134            "ID_AUDIO_BITRATE=%d\nID_AUDIO_RATE=%d\n" "ID_AUDIO_NCH=%d\n",
 135            sh_audio->i_bps * 8, sh_audio->samplerate, sh_audio->channels);
 136
 137     sh_audio->a_out_buffer_size = 0;
 138     sh_audio->a_out_buffer = NULL;
 139     sh_audio->a_out_buffer_len = 0;
 140
 141     return 1;
 142 }
 143
 144 static int init_audio(sh_audio_t *sh_audio, char *codecname, char *afm,
 145                       int status, stringset_t *selected)
 146 {
 147     unsigned int orig_fourcc = sh_audio->wf ? sh_audio->wf->wFormatTag : 0;
 148     int force = 0;
 149     if (codecname && codecname[0] == '+') {
 150         codecname = &codecname[1];
 151         force = 1;
 152     }
 153     sh_audio->codec = NULL;
 154     while (1) {
 155         const ad_functions_t *mpadec;
 156         int i;
 157         sh_audio->ad_driver = 0;
 158         // restore original fourcc:
 159         if (sh_audio->wf)
 160             sh_audio->wf->wFormatTag = i = orig_fourcc;
 161         if (!(sh_audio->codec = find_audio_codec(sh_audio->format,
 162                                                  sh_audio->wf ? (&i) : NULL,
 163                                                  sh_audio->codec, force)))
 164             break;
 165         if (sh_audio->wf)
 166             sh_audio->wf->wFormatTag = i;
 167         // ok we found one codec
 168         if (stringset_test(selected, sh_audio->codec->name))
 169             continue;   // already tried & failed
 170         if (codecname && strcmp(sh_audio->codec->name, codecname))
 171             continue;   // -ac
 172         if (afm && strcmp(sh_audio->codec->drv, afm))
 173             continue;   // afm doesn't match
 174         if (!force && sh_audio->codec->status < status)
 175             continue;   // too unstable
 176         stringset_add(selected, sh_audio->codec->name); // tagging it
 177         // ok, it matches all rules, let's find the driver!
 178         for (i = 0; mpcodecs_ad_drivers[i] != NULL; i++)
 179             if (!strcmp(mpcodecs_ad_drivers[i]->info->short_name,
 180                  sh_audio->codec->drv))
 181                 break;
 182         mpadec = mpcodecs_ad_drivers[i];
 183 #ifdef CONFIG_DYNAMIC_PLUGINS
 184         if (!mpadec) {
 185             /* try to open shared decoder plugin */
 186             int buf_len;
 187             char *buf;
 188             ad_functions_t *funcs_sym;
 189             ad_info_t *info_sym;
 190
 191             buf_len =
 192                 strlen(MPLAYER_LIBDIR) + strlen(sh_audio->codec->drv) + 16;
 193             buf = malloc(buf_len);
 194             if (!buf)
 195                 break;
 196             snprintf(buf, buf_len, "%s/mplayer/ad_%s.so", MPLAYER_LIBDIR,
 197                      sh_audio->codec->drv);
 198             mp_msg(MSGT_DECAUDIO, MSGL_DBG2,
 199                    "Trying to open external plugin: %s\n", buf);
 200             sh_audio->dec_handle = dlopen(buf, RTLD_LAZY);
 201             if (!sh_audio->dec_handle)
 202                 break;
 203             snprintf(buf, buf_len, "mpcodecs_ad_%s", sh_audio->codec->drv);
 204             funcs_sym = dlsym(sh_audio->dec_handle, buf);
 205             if (!funcs_sym || !funcs_sym->info || !funcs_sym->preinit
 206                 || !funcs_sym->init || !funcs_sym->uninit
 207                 || !funcs_sym->control || !funcs_sym->decode_audio)
 208                 break;
 209             info_sym = funcs_sym->info;
 210             if (strcmp(info_sym->short_name, sh_audio->codec->drv))
 211                 break;
 212             free(buf);
 213             mpadec = funcs_sym;
 214             mp_msg(MSGT_DECAUDIO, MSGL_V,
 215                    "Using external decoder plugin (%s/mplayer/ad_%s.so)!\n",
 216                    MPLAYER_LIBDIR, sh_audio->codec->drv);
 217         }
 218 #endif
 219         if (!mpadec) {          // driver not available (==compiled in)
 220             mp_tmsg(MSGT_DECAUDIO, MSGL_ERR,
 221                    "Requested audio codec family [%s] (afm=%s) not available.\nEnable it at compilation.\n",
 222                    sh_audio->codec->name, sh_audio->codec->drv);
 223             continue;
 224         }
 225         // it's available, let's try to init!
 226         // init()
 227         mp_tmsg(MSGT_DECAUDIO, MSGL_INFO, "Opening audio decoder: [%s] %s\n",
 228                mpadec->info->short_name, mpadec->info->name);
 229         sh_audio->ad_driver = mpadec;
 230         if (!init_audio_codec(sh_audio)) {
 231             mp_tmsg(MSGT_DECAUDIO, MSGL_INFO, "ADecoder init failed :(\n");
 232             continue;           // try next...
 233         }
 234         // Yeah! We got it!
 235         return 1;
 236     }
 237     return 0;
 238 }
 239
 240 int init_best_audio_codec(sh_audio_t *sh_audio, char **audio_codec_list,
 241                           char **audio_fm_list)
 242 {
 243     stringset_t selected;
 244     char *ac_l_default[2] = { "", (char *) NULL };
 245     // hack:
 246     if (!audio_codec_list)
 247         audio_codec_list = ac_l_default;
 248     // Go through the codec.conf and find the best codec...
 249     sh_audio->initialized = 0;
 250     stringset_init(&selected);
 251     while (!sh_audio->initialized && *audio_codec_list) {
 252         char *audio_codec = *(audio_codec_list++);
 253         if (audio_codec[0]) {
 254             if (audio_codec[0] == '-') {
 255                 // disable this codec:
 256                 stringset_add(&selected, audio_codec + 1);
 257             } else {
 258                 // forced codec by name:
 259                 mp_tmsg(MSGT_DECAUDIO, MSGL_INFO, "Forced audio codec: %s\n",
 260                        audio_codec);
 261                 init_audio(sh_audio, audio_codec, NULL, -1, &selected);
 262             }
 263         } else {
 264             int status;
 265             // try in stability order: UNTESTED, WORKING, BUGGY.
 266             // never try CRASHING.
 267             if (audio_fm_list) {
 268                 char **fmlist = audio_fm_list;
 269                 // try first the preferred codec families:
 270                 while (!sh_audio->initialized && *fmlist) {
 271                     char *audio_fm = *(fmlist++);
 272                     mp_tmsg(MSGT_DECAUDIO, MSGL_INFO, "Trying to force audio codec driver family %s...\n",
 273                            audio_fm);
 274                     for (status = CODECS_STATUS__MAX;
 275                          status >= CODECS_STATUS__MIN; --status)
 276                         if (init_audio(sh_audio, NULL, audio_fm, status, &selected))
 277                             break;
 278                 }
 279             }
 280             if (!sh_audio->initialized)
 281                 for (status = CODECS_STATUS__MAX; status >= CODECS_STATUS__MIN;
 282                      --status)
 283                     if (init_audio(sh_audio, NULL, NULL, status, &selected))
 284                         break;
 285         }
 286     }
 287     stringset_free(&selected);
 288
 289     if (!sh_audio->initialized) {
 290         mp_tmsg(MSGT_DECAUDIO, MSGL_ERR, "Cannot find codec for audio format 0x%X.\n",
 291                sh_audio->format);
 292         return 0;   // failed
 293     }
 294
 295     mp_tmsg(MSGT_DECAUDIO, MSGL_INFO, "Selected audio codec: [%s] afm: %s (%s)\n",
 296            sh_audio->codec->name, sh_audio->codec->drv, sh_audio->codec->info);
 297     return 1;   // success
 298 }
 299
 300 void uninit_audio(sh_audio_t *sh_audio)
 301 {
 302     if (sh_audio->afilter) {
 303         mp_msg(MSGT_DECAUDIO, MSGL_V, "Uninit audio filters...\n");
 304         af_uninit(sh_audio->afilter);
 305         free(sh_audio->afilter);
 306         sh_audio->afilter = NULL;
 307     }
 308     if (sh_audio->initialized) {
 309         mp_tmsg(MSGT_DECAUDIO, MSGL_V, "Uninit audio: %s\n",
 310                sh_audio->codec->drv);
 311         sh_audio->ad_driver->uninit(sh_audio);
 312 #ifdef CONFIG_DYNAMIC_PLUGINS
 313         if (sh_audio->dec_handle)
 314             dlclose(sh_audio->dec_handle);
 315 #endif
 316         sh_audio->initialized = 0;
 317     }
 318     free(sh_audio->a_out_buffer);
 319     sh_audio->a_out_buffer = NULL;
 320     sh_audio->a_out_buffer_size = 0;
 321     av_freep(&sh_audio->a_buffer);
 322     av_freep(&sh_audio->a_in_buffer);
 323 }
 324
 325
 326 int init_audio_filters(sh_audio_t *sh_audio, int in_samplerate,
 327                        int *out_samplerate, int *out_channels, int *out_format)
 328 {
 329     af_stream_t *afs = sh_audio->afilter;
 330     if (!afs) {
 331         afs = calloc(1, sizeof(struct af_stream));
 332         afs->opts = sh_audio->opts;
 333     }
 334     // input format: same as codec's output format:
 335     afs->input.rate   = in_samplerate;
 336     afs->input.nch    = sh_audio->channels;
 337     afs->input.format = sh_audio->sample_format;
 338     af_fix_parameters(&(afs->input));
 339
 340     // output format: same as ao driver's input format (if missing, fallback to input)
 341     afs->output.rate   = *out_samplerate;
 342     afs->output.nch    = *out_channels;
 343     afs->output.format = *out_format;
 344     af_fix_parameters(&(afs->output));
 345
 346     // filter config:
 347     memcpy(&afs->cfg, &af_cfg, sizeof(af_cfg_t));
 348
 349     mp_tmsg(MSGT_DECAUDIO, MSGL_V, "Building audio filter chain for %dHz/%dch/%s -> %dHz/%dch/%s...\n",
 350            afs->input.rate, afs->input.nch,
 351            af_fmt2str_short(afs->input.format), afs->output.rate,
 352            afs->output.nch, af_fmt2str_short(afs->output.format));
 353
 354     // let's autoprobe it!
 355     if (0 != af_init(afs)) {
 356         sh_audio->afilter = NULL;
 357         free(afs);
 358         return 0;   // failed :(
 359     }
 360
 361     *out_samplerate = afs->output.rate;
 362     *out_channels = afs->output.nch;
 363     *out_format = afs->output.format;
 364
 365     sh_audio->a_out_buffer_len = 0;
 366
 367     // ok!
 368     sh_audio->afilter = (void *) afs;
 369     return 1;
 370 }
 371
 372 static int filter_n_bytes(sh_audio_t *sh, int len)
 373 {
 374     assert(len-1 + sh->audio_out_minsize <= sh->a_buffer_size);
 375
 376     int error = 0;
 377
 378     // Decode more bytes if needed
 379     int old_samplerate = sh->samplerate;
 380     int old_channels = sh->channels;
 381     int old_sample_format = sh->sample_format;
 382     while (sh->a_buffer_len < len) {
 383         unsigned char *buf = sh->a_buffer + sh->a_buffer_len;
 384         int minlen = len - sh->a_buffer_len;
 385         int maxlen = sh->a_buffer_size - sh->a_buffer_len;
 386         int ret = sh->ad_driver->decode_audio(sh, buf, minlen, maxlen);
 387         int format_change = sh->samplerate != old_samplerate
 388                             || sh->channels != old_channels
 389                             || sh->sample_format != old_sample_format;
 390         if (ret <= 0 || format_change) {
 391             error = format_change ? -2 : -1;
 392             // samples from format-changing call get discarded too
 393             len = sh->a_buffer_len;
 394             break;
 395         }
 396         sh->a_buffer_len += ret;
 397     }
 398
 399     // Filter
 400     af_data_t filter_input = {
 401         .audio = sh->a_buffer,
 402         .len = len,
 403         .rate = sh->samplerate,
 404         .nch = sh->channels,
 405         .format = sh->sample_format
 406     };
 407     af_fix_parameters(&filter_input);
 408     af_data_t *filter_output = af_play(sh->afilter, &filter_input);
 409     if (!filter_output)
 410         return -1;
 411     if (sh->a_out_buffer_size < sh->a_out_buffer_len + filter_output->len) {
 412         int newlen = sh->a_out_buffer_len + filter_output->len;
 413         mp_msg(MSGT_DECAUDIO, MSGL_V, "Increasing filtered audio buffer size "
 414                "from %d to %d\n", sh->a_out_buffer_size, newlen);
 415         sh->a_out_buffer = realloc(sh->a_out_buffer, newlen);
 416         sh->a_out_buffer_size = newlen;
 417     }
 418     memcpy(sh->a_out_buffer + sh->a_out_buffer_len, filter_output->audio,
 419            filter_output->len);
 420     sh->a_out_buffer_len += filter_output->len;
 421
 422     // remove processed data from decoder buffer:
 423     sh->a_buffer_len -= len;
 424     memmove(sh->a_buffer, sh->a_buffer + len, sh->a_buffer_len);
 425
 426     return error;
 427 }
 428
 429 /* Try to get at least minlen decoded+filtered bytes in sh_audio->a_out_buffer
 430  * (total length including possible existing data).
 431  * Return 0 on success, -1 on error/EOF (not distinguished).
 432  * In the former case sh_audio->a_out_buffer_len is always >= minlen
 433  * on return. In case of EOF/error it might or might not be.
 434  * Can reallocate sh_audio->a_out_buffer if needed to fit all filter output. */
 435 int decode_audio(sh_audio_t *sh_audio, int minlen)
 436 {
 437     // Indicates that a filter seems to be buffering large amounts of data
 438     int huge_filter_buffer = 0;
 439     // Decoded audio must be cut at boundaries of this many bytes
 440     int unitsize = sh_audio->channels * sh_audio->samplesize * 16;
 441
 442     /* Filter output size will be about filter_multiplier times input size.
 443      * If some filter buffers audio in big blocks this might only hold
 444      * as average over time. */
 445     double filter_multiplier = af_calc_filter_multiplier(sh_audio->afilter);
 446
 447     /* If the decoder set audio_out_minsize then it can do the equivalent of
 448      * "while (output_len < target_len) output_len += audio_out_minsize;",
 449      * so we must guarantee there is at least audio_out_minsize-1 bytes
 450      * more space in the output buffer than the minimum length we try to
 451      * decode. */
 452     int max_decode_len = sh_audio->a_buffer_size - sh_audio->audio_out_minsize;
 453     max_decode_len -= max_decode_len % unitsize;
 454
 455     while (sh_audio->a_out_buffer_len < minlen) {
 456         int declen = (minlen - sh_audio->a_out_buffer_len) / filter_multiplier
 457             + (unitsize << 5); // some extra for possible filter buffering
 458         if (huge_filter_buffer)
 459         /* Some filter must be doing significant buffering if the estimated
 460          * input length didn't produce enough output from filters.
 461          * Feed the filters 2k bytes at a time until we have enough output.
 462          * Very small amounts could make filtering inefficient while large
 463          * amounts can make MPlayer demux the file unnecessarily far ahead
 464          * to get audio data and buffer video frames in memory while doing
 465          * so. However the performance impact of either is probably not too
 466          * significant as long as the value is not completely insane. */
 467             declen = 2000;
 468         declen -= declen % unitsize;
 469         if (declen > max_decode_len)
 470             declen = max_decode_len;
 471         else
 472             /* if this iteration does not fill buffer, we must have lots
 473              * of buffering in filters */
 474             huge_filter_buffer = 1;
 475         int res = filter_n_bytes(sh_audio, declen);
 476         if (res < 0)
 477             return res;
 478     }
 479     return 0;
 480 }
 481
 482 void resync_audio_stream(sh_audio_t *sh_audio)
 483 {
 484     sh_audio->a_in_buffer_len = 0;      // clear audio input buffer
 485     sh_audio->pts = MP_NOPTS_VALUE;
 486     if (!sh_audio->initialized)
 487         return;
 488     sh_audio->ad_driver->control(sh_audio, ADCTRL_RESYNC_STREAM, NULL);
 489 }
 490
 491 void skip_audio_frame(sh_audio_t *sh_audio)
 492 {
 493     if (!sh_audio->initialized)
 494         return;
 495     if (sh_audio->ad_driver->control(sh_audio, ADCTRL_SKIP_FRAME, NULL) ==
 496         CONTROL_TRUE)
 497         return;
 498     // default skip code:
 499     ds_fill_buffer(sh_audio->ds);       // skip block
 500 }