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 "bstr.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 af_cfg_t af_cfg = { 1, NULL };  // Configuration for audio filters
  49
  50 void afm_help(void)
  51 {
  52     int i;
  53     mp_tmsg(MSGT_DECAUDIO, MSGL_INFO, "Available (compiled-in) audio codec families/drivers:\n");
  54     mp_msg(MSGT_IDENTIFY, MSGL_INFO, "ID_AUDIO_DRIVERS\n");
  55     mp_msg(MSGT_DECAUDIO, MSGL_INFO, "    afm:    info:  (comment)\n");
  56     for (i = 0; mpcodecs_ad_drivers[i] != NULL; i++)
  57         if (mpcodecs_ad_drivers[i]->info->comment
  58             && mpcodecs_ad_drivers[i]->info->comment[0])
  59             mp_msg(MSGT_DECAUDIO, MSGL_INFO, "%9s  %s (%s)\n",
  60                    mpcodecs_ad_drivers[i]->info->short_name,
  61                    mpcodecs_ad_drivers[i]->info->name,
  62                    mpcodecs_ad_drivers[i]->info->comment);
  63         else
  64             mp_msg(MSGT_DECAUDIO, MSGL_INFO, "%9s  %s\n",
  65                    mpcodecs_ad_drivers[i]->info->short_name,
  66                    mpcodecs_ad_drivers[i]->info->name);
  67 }
  68
  69 static int init_audio_codec(sh_audio_t *sh_audio)
  70 {
  71     assert(!sh_audio->initialized);
  72     resync_audio_stream(sh_audio);
  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     sh_audio->audio_out_minsize = 8192; // default, preinit() may change it
  82     if (!sh_audio->ad_driver->preinit(sh_audio)) {
  83         mp_tmsg(MSGT_DECAUDIO, MSGL_ERR, "ADecoder preinit failed :(\n");
  84         return 0;
  85     }
  86
  87     /* allocate audio in buffer: */
  88     if (sh_audio->audio_in_minsize > 0) {
  89         sh_audio->a_in_buffer_size = sh_audio->audio_in_minsize;
  90         mp_tmsg(MSGT_DECAUDIO, MSGL_V, "dec_audio: Allocating %d bytes for input buffer.\n",
  91                sh_audio->a_in_buffer_size);
  92         sh_audio->a_in_buffer = av_mallocz(sh_audio->a_in_buffer_size);
  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     return 1;
 139 }
 140
 141 static int init_audio(sh_audio_t *sh_audio, char *codecname, char *afm,
 142                       int status, stringset_t *selected)
 143 {
 144     unsigned int orig_fourcc = sh_audio->wf ? sh_audio->wf->wFormatTag : 0;
 145     int force = 0;
 146     if (codecname && codecname[0] == '+') {
 147         codecname = &codecname[1];
 148         force = 1;
 149     }
 150     sh_audio->codec = NULL;
 151     while (1) {
 152         const ad_functions_t *mpadec;
 153         int i;
 154         sh_audio->ad_driver = 0;
 155         // restore original fourcc:
 156         if (sh_audio->wf)
 157             sh_audio->wf->wFormatTag = i = orig_fourcc;
 158         if (!(sh_audio->codec = find_audio_codec(sh_audio->format,
 159                                                  sh_audio->wf ? (&i) : NULL,
 160                                                  sh_audio->codec, force)))
 161             break;
 162         if (sh_audio->wf)
 163             sh_audio->wf->wFormatTag = i;
 164         // ok we found one codec
 165         if (stringset_test(selected, sh_audio->codec->name))
 166             continue;   // already tried & failed
 167         if (codecname && strcmp(sh_audio->codec->name, codecname))
 168             continue;   // -ac
 169         if (afm && strcmp(sh_audio->codec->drv, afm))
 170             continue;   // afm doesn't match
 171         if (!force && sh_audio->codec->status < status)
 172             continue;   // too unstable
 173         stringset_add(selected, sh_audio->codec->name); // tagging it
 174         // ok, it matches all rules, let's find the driver!
 175         for (i = 0; mpcodecs_ad_drivers[i] != NULL; i++)
 176             if (!strcmp(mpcodecs_ad_drivers[i]->info->short_name,
 177                  sh_audio->codec->drv))
 178                 break;
 179         mpadec = mpcodecs_ad_drivers[i];
 180 #ifdef CONFIG_DYNAMIC_PLUGINS
 181         if (!mpadec) {
 182             /* try to open shared decoder plugin */
 183             int buf_len;
 184             char *buf;
 185             ad_functions_t *funcs_sym;
 186             ad_info_t *info_sym;
 187
 188             buf_len =
 189                 strlen(MPLAYER_LIBDIR) + strlen(sh_audio->codec->drv) + 16;
 190             buf = malloc(buf_len);
 191             if (!buf)
 192                 break;
 193             snprintf(buf, buf_len, "%s/mplayer/ad_%s.so", MPLAYER_LIBDIR,
 194                      sh_audio->codec->drv);
 195             mp_msg(MSGT_DECAUDIO, MSGL_DBG2,
 196                    "Trying to open external plugin: %s\n", buf);
 197             sh_audio->dec_handle = dlopen(buf, RTLD_LAZY);
 198             if (!sh_audio->dec_handle)
 199                 break;
 200             snprintf(buf, buf_len, "mpcodecs_ad_%s", sh_audio->codec->drv);
 201             funcs_sym = dlsym(sh_audio->dec_handle, buf);
 202             if (!funcs_sym || !funcs_sym->info || !funcs_sym->preinit
 203                 || !funcs_sym->init || !funcs_sym->uninit
 204                 || !funcs_sym->control || !funcs_sym->decode_audio)
 205                 break;
 206             info_sym = funcs_sym->info;
 207             if (strcmp(info_sym->short_name, sh_audio->codec->drv))
 208                 break;
 209             free(buf);
 210             mpadec = funcs_sym;
 211             mp_msg(MSGT_DECAUDIO, MSGL_V,
 212                    "Using external decoder plugin (%s/mplayer/ad_%s.so)!\n",
 213                    MPLAYER_LIBDIR, sh_audio->codec->drv);
 214         }
 215 #endif
 216         if (!mpadec) {          // driver not available (==compiled in)
 217             mp_tmsg(MSGT_DECAUDIO, MSGL_ERR,
 218                    "Requested audio codec family [%s] (afm=%s) not available.\nEnable it at compilation.\n",
 219                    sh_audio->codec->name, sh_audio->codec->drv);
 220             continue;
 221         }
 222         // it's available, let's try to init!
 223         // init()
 224         mp_tmsg(MSGT_DECAUDIO, MSGL_INFO, "Opening audio decoder: [%s] %s\n",
 225                mpadec->info->short_name, mpadec->info->name);
 226         sh_audio->ad_driver = mpadec;
 227         if (!init_audio_codec(sh_audio)) {
 228             mp_tmsg(MSGT_DECAUDIO, MSGL_WARN,
 229                     "Could not open audio decoder %s.\n",
 230                     mpadec->info->short_name);
 231             continue;           // try next...
 232         }
 233         // Yeah! We got it!
 234         return 1;
 235     }
 236     return 0;
 237 }
 238
 239 int init_best_audio_codec(sh_audio_t *sh_audio, char **audio_codec_list,
 240                           char **audio_fm_list)
 241 {
 242     stringset_t selected;
 243     char *ac_l_default[2] = { "", (char *) NULL };
 244     // hack:
 245     if (!audio_codec_list)
 246         audio_codec_list = ac_l_default;
 247     // Go through the codec.conf and find the best codec...
 248     sh_audio->initialized = 0;
 249     stringset_init(&selected);
 250     while (!sh_audio->initialized && *audio_codec_list) {
 251         char *audio_codec = *(audio_codec_list++);
 252         if (audio_codec[0]) {
 253             if (audio_codec[0] == '-') {
 254                 // disable this codec:
 255                 stringset_add(&selected, audio_codec + 1);
 256             } else {
 257                 // forced codec by name:
 258                 mp_tmsg(MSGT_DECAUDIO, MSGL_INFO, "Forced audio codec: %s\n",
 259                        audio_codec);
 260                 init_audio(sh_audio, audio_codec, NULL, -1, &selected);
 261             }
 262         } else {
 263             int status;
 264             // try in stability order: UNTESTED, WORKING, BUGGY.
 265             // never try CRASHING.
 266             if (audio_fm_list) {
 267                 char **fmlist = audio_fm_list;
 268                 // try first the preferred codec families:
 269                 while (!sh_audio->initialized && *fmlist) {
 270                     char *audio_fm = *(fmlist++);
 271                     mp_tmsg(MSGT_DECAUDIO, MSGL_INFO, "Trying to force audio codec driver family %s...\n",
 272                            audio_fm);
 273                     for (status = CODECS_STATUS__MAX;
 274                          status >= CODECS_STATUS__MIN; --status)
 275                         if (init_audio(sh_audio, NULL, audio_fm, status, &selected))
 276                             break;
 277                 }
 278             }
 279             if (!sh_audio->initialized)
 280                 for (status = CODECS_STATUS__MAX; status >= CODECS_STATUS__MIN;
 281                      --status)
 282                     if (init_audio(sh_audio, NULL, NULL, status, &selected))
 283                         break;
 284         }
 285     }
 286     stringset_free(&selected);
 287
 288     if (!sh_audio->initialized) {
 289         mp_tmsg(MSGT_DECAUDIO, MSGL_ERR, "Cannot find codec for audio format 0x%X.\n",
 290                sh_audio->format);
 291         return 0;   // failed
 292     }
 293
 294     mp_tmsg(MSGT_DECAUDIO, MSGL_INFO, "Selected audio codec: [%s] afm: %s (%s)\n",
 295            sh_audio->codec->name, sh_audio->codec->drv, sh_audio->codec->info);
 296     return 1;   // success
 297 }
 298
 299 void uninit_audio(sh_audio_t *sh_audio)
 300 {
 301     if (sh_audio->afilter) {
 302         mp_msg(MSGT_DECAUDIO, MSGL_V, "Uninit audio filters...\n");
 303         af_uninit(sh_audio->afilter);
 304         free(sh_audio->afilter);
 305         sh_audio->afilter = NULL;
 306     }
 307     if (sh_audio->initialized) {
 308         mp_tmsg(MSGT_DECAUDIO, MSGL_V, "Uninit audio: %s\n",
 309                sh_audio->codec->drv);
 310         sh_audio->ad_driver->uninit(sh_audio);
 311 #ifdef CONFIG_DYNAMIC_PLUGINS
 312         if (sh_audio->dec_handle)
 313             dlclose(sh_audio->dec_handle);
 314 #endif
 315         sh_audio->initialized = 0;
 316     }
 317     av_freep(&sh_audio->a_buffer);
 318     av_freep(&sh_audio->a_in_buffer);
 319 }
 320
 321
 322 int init_audio_filters(sh_audio_t *sh_audio, int in_samplerate,
 323                        int *out_samplerate, int *out_channels, int *out_format)
 324 {
 325     af_stream_t *afs = sh_audio->afilter;
 326     if (!afs) {
 327         afs = calloc(1, sizeof(struct af_stream));
 328         afs->opts = sh_audio->opts;
 329     }
 330     // input format: same as codec's output format:
 331     afs->input.rate   = in_samplerate;
 332     afs->input.nch    = sh_audio->channels;
 333     afs->input.format = sh_audio->sample_format;
 334     af_fix_parameters(&(afs->input));
 335
 336     // output format: same as ao driver's input format (if missing, fallback to input)
 337     afs->output.rate   = *out_samplerate;
 338     afs->output.nch    = *out_channels;
 339     afs->output.format = *out_format;
 340     af_fix_parameters(&(afs->output));
 341
 342     // filter config:
 343     memcpy(&afs->cfg, &af_cfg, sizeof(af_cfg_t));
 344
 345     mp_tmsg(MSGT_DECAUDIO, MSGL_V, "Building audio filter chain for %dHz/%dch/%s -> %dHz/%dch/%s...\n",
 346            afs->input.rate, afs->input.nch,
 347            af_fmt2str_short(afs->input.format), afs->output.rate,
 348            afs->output.nch, af_fmt2str_short(afs->output.format));
 349
 350     // let's autoprobe it!
 351     if (0 != af_init(afs)) {
 352         sh_audio->afilter = NULL;
 353         free(afs);
 354         return 0;   // failed :(
 355     }
 356
 357     *out_samplerate = afs->output.rate;
 358     *out_channels = afs->output.nch;
 359     *out_format = afs->output.format;
 360
 361     // ok!
 362     sh_audio->afilter = (void *) afs;
 363     return 1;
 364 }
 365
 366 static void set_min_out_buffer_size(struct bstr *outbuf, int len)
 367 {
 368     size_t oldlen = talloc_get_size(outbuf->start);
 369     if (oldlen < len) {
 370         assert(outbuf->start);  // talloc context should be already set
 371         mp_msg(MSGT_DECAUDIO, MSGL_V, "Increasing filtered audio buffer size "
 372                "from %zd to %d\n", oldlen, len);
 373         outbuf->start = talloc_realloc_size(NULL, outbuf->start, len);
 374     }
 375 }
 376
 377 static int filter_n_bytes(sh_audio_t *sh, struct bstr *outbuf, int len)
 378 {
 379     assert(len-1 + sh->audio_out_minsize <= sh->a_buffer_size);
 380
 381     int error = 0;
 382
 383     // Decode more bytes if needed
 384     int old_samplerate = sh->samplerate;
 385     int old_channels = sh->channels;
 386     int old_sample_format = sh->sample_format;
 387     while (sh->a_buffer_len < len) {
 388         unsigned char *buf = sh->a_buffer + sh->a_buffer_len;
 389         int minlen = len - sh->a_buffer_len;
 390         int maxlen = sh->a_buffer_size - sh->a_buffer_len;
 391         int ret = sh->ad_driver->decode_audio(sh, buf, minlen, maxlen);
 392         int format_change = sh->samplerate != old_samplerate
 393                             || sh->channels != old_channels
 394                             || sh->sample_format != old_sample_format;
 395         if (ret <= 0 || format_change) {
 396             error = format_change ? -2 : -1;
 397             // samples from format-changing call get discarded too
 398             len = sh->a_buffer_len;
 399             break;
 400         }
 401         sh->a_buffer_len += ret;
 402     }
 403
 404     // Filter
 405     af_data_t filter_input = {
 406         .audio = sh->a_buffer,
 407         .len = len,
 408         .rate = sh->samplerate,
 409         .nch = sh->channels,
 410         .format = sh->sample_format
 411     };
 412     af_fix_parameters(&filter_input);
 413     af_data_t *filter_output = af_play(sh->afilter, &filter_input);
 414     if (!filter_output)
 415         return -1;
 416     set_min_out_buffer_size(outbuf, outbuf->len + filter_output->len);
 417     memcpy(outbuf->start + outbuf->len, filter_output->audio,
 418            filter_output->len);
 419     outbuf->len += filter_output->len;
 420
 421     // remove processed data from decoder buffer:
 422     sh->a_buffer_len -= len;
 423     memmove(sh->a_buffer, sh->a_buffer + len, sh->a_buffer_len);
 424
 425     return error;
 426 }
 427
 428 /* Try to get at least minlen decoded+filtered bytes in outbuf
 429  * (total length including possible existing data).
 430  * Return 0 on success, -1 on error/EOF (not distinguished).
 431  * In the former case outbuf->len is always >= minlen on return.
 432  * In case of EOF/error it might or might not be.
 433  * Outbuf.start must be talloc-allocated, and will be reallocated
 434  * if needed to fit all filter output. */
 435 int decode_audio(sh_audio_t *sh_audio, struct bstr *outbuf, 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 (outbuf->len < minlen) {
 456         int declen = (minlen - outbuf->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, outbuf, declen);
 476         if (res < 0)
 477             return res;
 478     }
 479     return 0;
 480 }
 481
 482 void decode_audio_prepend_bytes(struct bstr *outbuf, int count, int byte)
 483 {
 484     set_min_out_buffer_size(outbuf, outbuf->len + count);
 485     memmove(outbuf->start + count, outbuf->start, outbuf->len);
 486     memset(outbuf->start, byte, count);
 487     outbuf->len += count;
 488 }
 489
 490
 491 void resync_audio_stream(sh_audio_t *sh_audio)
 492 {
 493     sh_audio->a_in_buffer_len = 0;      // clear audio input buffer
 494     sh_audio->pts = MP_NOPTS_VALUE;
 495     if (!sh_audio->initialized)
 496         return;
 497     sh_audio->ad_driver->control(sh_audio, ADCTRL_RESYNC_STREAM, NULL);
 498 }
 499
 500 void skip_audio_frame(sh_audio_t *sh_audio)
 501 {
 502     if (!sh_audio->initialized)
 503         return;
 504     if (sh_audio->ad_driver->control(sh_audio, ADCTRL_SKIP_FRAME, NULL) ==
 505         CONTROL_TRUE)
 506         return;
 507     // default skip code:
 508     ds_fill_buffer(sh_audio->ds);       // skip block
 509 }