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