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_FAKE_MONO
  41 int fakemono = 0;
  42 #endif
  43
  44 af_cfg_t af_cfg = { 1, NULL };  // Configuration for audio filters
  45
  46 void afm_help(void)
  47 {
  48     int i;
  49     mp_tmsg(MSGT_DECAUDIO, MSGL_INFO, "Available (compiled-in) audio codec families/drivers:\n");
  50     mp_msg(MSGT_IDENTIFY, MSGL_INFO, "ID_AUDIO_DRIVERS\n");
  51     mp_msg(MSGT_DECAUDIO, MSGL_INFO, "    afm:    info:  (comment)\n");
  52     for (i = 0; mpcodecs_ad_drivers[i] != NULL; i++)
  53         if (mpcodecs_ad_drivers[i]->info->comment
  54             && mpcodecs_ad_drivers[i]->info->comment[0])
  55             mp_msg(MSGT_DECAUDIO, MSGL_INFO, "%9s  %s (%s)\n",
  56                    mpcodecs_ad_drivers[i]->info->short_name,
  57                    mpcodecs_ad_drivers[i]->info->name,
  58                    mpcodecs_ad_drivers[i]->info->comment);
  59         else
  60             mp_msg(MSGT_DECAUDIO, MSGL_INFO, "%9s  %s\n",
  61                    mpcodecs_ad_drivers[i]->info->short_name,
  62                    mpcodecs_ad_drivers[i]->info->name);
  63 }
  64
  65 static int init_audio_codec(sh_audio_t *sh_audio)
  66 {
  67     assert(!sh_audio->initialized);
  68     resync_audio_stream(sh_audio);
  69     if ((af_cfg.force & AF_INIT_FORMAT_MASK) == AF_INIT_FLOAT) {
  70         int fmt = AF_FORMAT_FLOAT_NE;
  71         if (sh_audio->ad_driver->control(sh_audio, ADCTRL_QUERY_FORMAT,
  72                                          &fmt) == CONTROL_TRUE) {
  73             sh_audio->sample_format = fmt;
  74             sh_audio->samplesize = 4;
  75         }
  76     }
  77     sh_audio->audio_out_minsize = 8192; // default, preinit() may change it
  78     if (!sh_audio->ad_driver->preinit(sh_audio)) {
  79         mp_tmsg(MSGT_DECAUDIO, MSGL_ERR, "ADecoder preinit failed :(\n");
  80         return 0;
  81     }
  82
  83     /* allocate audio in buffer: */
  84     if (sh_audio->audio_in_minsize > 0) {
  85         sh_audio->a_in_buffer_size = sh_audio->audio_in_minsize;
  86         mp_tmsg(MSGT_DECAUDIO, MSGL_V, "dec_audio: Allocating %d bytes for input buffer.\n",
  87                sh_audio->a_in_buffer_size);
  88         sh_audio->a_in_buffer = av_mallocz(sh_audio->a_in_buffer_size);
  89     }
  90
  91     const int base_size = 65536;
  92     // At least 64 KiB plus rounding up to next decodable unit size
  93     sh_audio->a_buffer_size = base_size + sh_audio->audio_out_minsize;
  94
  95     mp_tmsg(MSGT_DECAUDIO, MSGL_V, "dec_audio: Allocating %d + %d = %d bytes for output buffer.\n",
  96            sh_audio->audio_out_minsize, base_size, sh_audio->a_buffer_size);
  97
  98     sh_audio->a_buffer = av_mallocz(sh_audio->a_buffer_size);
  99     if (!sh_audio->a_buffer) {
 100         mp_tmsg(MSGT_DECAUDIO, MSGL_ERR, "Cannot allocate audio out buffer.\n");
 101         return 0;
 102     }
 103     sh_audio->a_buffer_len = 0;
 104
 105     if (!sh_audio->ad_driver->init(sh_audio)) {
 106         mp_tmsg(MSGT_DECAUDIO, MSGL_WARN, "ADecoder init failed :(\n");
 107         uninit_audio(sh_audio); // free buffers
 108         return 0;
 109     }
 110
 111     sh_audio->initialized = 1;
 112
 113     if (!sh_audio->channels || !sh_audio->samplerate) {
 114         mp_tmsg(MSGT_DECAUDIO, MSGL_WARN, "Unknown/missing audio format -> no sound\n");
 115         uninit_audio(sh_audio); // free buffers
 116         return 0;
 117     }
 118
 119     if (!sh_audio->o_bps)
 120         sh_audio->o_bps = sh_audio->channels * sh_audio->samplerate
 121                           * sh_audio->samplesize;
 122
 123     mp_msg(MSGT_DECAUDIO, MSGL_INFO,
 124            "AUDIO: %d Hz, %d ch, %s, %3.1f kbit/%3.2f%% (ratio: %d->%d)\n",
 125            sh_audio->samplerate, sh_audio->channels,
 126            af_fmt2str_short(sh_audio->sample_format),
 127            sh_audio->i_bps * 8 * 0.001,
 128            ((float) sh_audio->i_bps / sh_audio->o_bps) * 100.0,
 129            sh_audio->i_bps, sh_audio->o_bps);
 130     mp_msg(MSGT_IDENTIFY, MSGL_INFO,
 131            "ID_AUDIO_BITRATE=%d\nID_AUDIO_RATE=%d\n" "ID_AUDIO_NCH=%d\n",
 132            sh_audio->i_bps * 8, sh_audio->samplerate, sh_audio->channels);
 133
 134     return 1;
 135 }
 136
 137 static int init_audio(sh_audio_t *sh_audio, char *codecname, char *afm,
 138                       int status, stringset_t *selected)
 139 {
 140     unsigned int orig_fourcc = sh_audio->wf ? sh_audio->wf->wFormatTag : 0;
 141     int force = 0;
 142     if (codecname && codecname[0] == '+') {
 143         codecname = &codecname[1];
 144         force = 1;
 145     }
 146     sh_audio->codec = NULL;
 147     while (1) {
 148         const ad_functions_t *mpadec;
 149         int i;
 150         sh_audio->ad_driver = 0;
 151         // restore original fourcc:
 152         if (sh_audio->wf)
 153             sh_audio->wf->wFormatTag = i = orig_fourcc;
 154         if (!(sh_audio->codec = find_audio_codec(sh_audio->format,
 155                                                  sh_audio->wf ? (&i) : NULL,
 156                                                  sh_audio->codec, force)))
 157             break;
 158         if (sh_audio->wf)
 159             sh_audio->wf->wFormatTag = i;
 160         // ok we found one codec
 161         if (stringset_test(selected, sh_audio->codec->name))
 162             continue;   // already tried & failed
 163         if (codecname && strcmp(sh_audio->codec->name, codecname))
 164             continue;   // -ac
 165         if (afm && strcmp(sh_audio->codec->drv, afm))
 166             continue;   // afm doesn't match
 167         if (!force && sh_audio->codec->status < status)
 168             continue;   // too unstable
 169         stringset_add(selected, sh_audio->codec->name); // tagging it
 170         // ok, it matches all rules, let's find the driver!
 171         for (i = 0; mpcodecs_ad_drivers[i] != NULL; i++)
 172             if (!strcmp(mpcodecs_ad_drivers[i]->info->short_name,
 173                  sh_audio->codec->drv))
 174                 break;
 175         mpadec = mpcodecs_ad_drivers[i];
 176         if (!mpadec) {          // driver not available (==compiled in)
 177             mp_tmsg(MSGT_DECAUDIO, MSGL_ERR,
 178                    "Requested audio codec family [%s] (afm=%s) not available.\nEnable it at compilation.\n",
 179                    sh_audio->codec->name, sh_audio->codec->drv);
 180             continue;
 181         }
 182         // it's available, let's try to init!
 183         // init()
 184         mp_tmsg(MSGT_DECAUDIO, MSGL_INFO, "Opening audio decoder: [%s] %s\n",
 185                mpadec->info->short_name, mpadec->info->name);
 186         sh_audio->ad_driver = mpadec;
 187         if (!init_audio_codec(sh_audio)) {
 188             mp_tmsg(MSGT_DECAUDIO, MSGL_WARN,
 189                     "Could not open audio decoder %s.\n",
 190                     mpadec->info->short_name);
 191             continue;           // try next...
 192         }
 193         // Yeah! We got it!
 194         return 1;
 195     }
 196     return 0;
 197 }
 198
 199 int init_best_audio_codec(sh_audio_t *sh_audio, char **audio_codec_list,
 200                           char **audio_fm_list)
 201 {
 202     stringset_t selected;
 203     char *ac_l_default[2] = { "", (char *) NULL };
 204     // hack:
 205     if (!audio_codec_list)
 206         audio_codec_list = ac_l_default;
 207     // Go through the codec.conf and find the best codec...
 208     sh_audio->initialized = 0;
 209     stringset_init(&selected);
 210     while (!sh_audio->initialized && *audio_codec_list) {
 211         char *audio_codec = *(audio_codec_list++);
 212         if (audio_codec[0]) {
 213             if (audio_codec[0] == '-') {
 214                 // disable this codec:
 215                 stringset_add(&selected, audio_codec + 1);
 216             } else {
 217                 // forced codec by name:
 218                 mp_tmsg(MSGT_DECAUDIO, MSGL_INFO, "Forced audio codec: %s\n",
 219                        audio_codec);
 220                 init_audio(sh_audio, audio_codec, NULL, -1, &selected);
 221             }
 222         } else {
 223             int status;
 224             // try in stability order: UNTESTED, WORKING, BUGGY.
 225             // never try CRASHING.
 226             if (audio_fm_list) {
 227                 char **fmlist = audio_fm_list;
 228                 // try first the preferred codec families:
 229                 while (!sh_audio->initialized && *fmlist) {
 230                     char *audio_fm = *(fmlist++);
 231                     mp_tmsg(MSGT_DECAUDIO, MSGL_INFO, "Trying to force audio codec driver family %s...\n",
 232                            audio_fm);
 233                     for (status = CODECS_STATUS__MAX;
 234                          status >= CODECS_STATUS__MIN; --status)
 235                         if (init_audio(sh_audio, NULL, audio_fm, status, &selected))
 236                             break;
 237                 }
 238             }
 239             if (!sh_audio->initialized)
 240                 for (status = CODECS_STATUS__MAX; status >= CODECS_STATUS__MIN;
 241                      --status)
 242                     if (init_audio(sh_audio, NULL, NULL, status, &selected))
 243                         break;
 244         }
 245     }
 246     stringset_free(&selected);
 247
 248     if (!sh_audio->initialized) {
 249         mp_tmsg(MSGT_DECAUDIO, MSGL_ERR, "Cannot find codec for audio format 0x%X.\n",
 250                sh_audio->format);
 251         return 0;   // failed
 252     }
 253
 254     mp_tmsg(MSGT_DECAUDIO, MSGL_INFO, "Selected audio codec: [%s] afm: %s (%s)\n",
 255            sh_audio->codec->name, sh_audio->codec->drv, sh_audio->codec->info);
 256     return 1;   // success
 257 }
 258
 259 void uninit_audio(sh_audio_t *sh_audio)
 260 {
 261     if (sh_audio->afilter) {
 262         mp_msg(MSGT_DECAUDIO, MSGL_V, "Uninit audio filters...\n");
 263         af_uninit(sh_audio->afilter);
 264         free(sh_audio->afilter);
 265         sh_audio->afilter = NULL;
 266     }
 267     if (sh_audio->initialized) {
 268         mp_tmsg(MSGT_DECAUDIO, MSGL_V, "Uninit audio: %s\n",
 269                sh_audio->codec->drv);
 270         sh_audio->ad_driver->uninit(sh_audio);
 271         sh_audio->initialized = 0;
 272     }
 273     av_freep(&sh_audio->a_buffer);
 274     av_freep(&sh_audio->a_in_buffer);
 275 }
 276
 277
 278 int init_audio_filters(sh_audio_t *sh_audio, int in_samplerate,
 279                        int *out_samplerate, int *out_channels, int *out_format)
 280 {
 281     af_stream_t *afs = sh_audio->afilter;
 282     if (!afs) {
 283         afs = calloc(1, sizeof(struct af_stream));
 284         afs->opts = sh_audio->opts;
 285     }
 286     // input format: same as codec's output format:
 287     afs->input.rate   = in_samplerate;
 288     afs->input.nch    = sh_audio->channels;
 289     afs->input.format = sh_audio->sample_format;
 290     af_fix_parameters(&(afs->input));
 291
 292     // output format: same as ao driver's input format (if missing, fallback to input)
 293     afs->output.rate   = *out_samplerate;
 294     afs->output.nch    = *out_channels;
 295     afs->output.format = *out_format;
 296     af_fix_parameters(&(afs->output));
 297
 298     // filter config:
 299     memcpy(&afs->cfg, &af_cfg, sizeof(af_cfg_t));
 300
 301     mp_tmsg(MSGT_DECAUDIO, MSGL_V, "Building audio filter chain for %dHz/%dch/%s -> %dHz/%dch/%s...\n",
 302            afs->input.rate, afs->input.nch,
 303            af_fmt2str_short(afs->input.format), afs->output.rate,
 304            afs->output.nch, af_fmt2str_short(afs->output.format));
 305
 306     // let's autoprobe it!
 307     if (0 != af_init(afs)) {
 308         sh_audio->afilter = NULL;
 309         free(afs);
 310         return 0;   // failed :(
 311     }
 312
 313     *out_samplerate = afs->output.rate;
 314     *out_channels = afs->output.nch;
 315     *out_format = afs->output.format;
 316
 317     // ok!
 318     sh_audio->afilter = (void *) afs;
 319     return 1;
 320 }
 321
 322 static void set_min_out_buffer_size(struct bstr *outbuf, int len)
 323 {
 324     size_t oldlen = talloc_get_size(outbuf->start);
 325     if (oldlen < len) {
 326         assert(outbuf->start);  // talloc context should be already set
 327         mp_msg(MSGT_DECAUDIO, MSGL_V, "Increasing filtered audio buffer size "
 328                "from %zd to %d\n", oldlen, len);
 329         outbuf->start = talloc_realloc_size(NULL, outbuf->start, len);
 330     }
 331 }
 332
 333 static int filter_n_bytes(sh_audio_t *sh, struct bstr *outbuf, int len)
 334 {
 335     assert(len-1 + sh->audio_out_minsize <= sh->a_buffer_size);
 336
 337     int error = 0;
 338
 339     // Decode more bytes if needed
 340     int old_samplerate = sh->samplerate;
 341     int old_channels = sh->channels;
 342     int old_sample_format = sh->sample_format;
 343     while (sh->a_buffer_len < len) {
 344         unsigned char *buf = sh->a_buffer + sh->a_buffer_len;
 345         int minlen = len - sh->a_buffer_len;
 346         int maxlen = sh->a_buffer_size - sh->a_buffer_len;
 347         int ret = sh->ad_driver->decode_audio(sh, buf, minlen, maxlen);
 348         int format_change = sh->samplerate != old_samplerate
 349                             || sh->channels != old_channels
 350                             || sh->sample_format != old_sample_format;
 351         if (ret <= 0 || format_change) {
 352             error = format_change ? -2 : -1;
 353             // samples from format-changing call get discarded too
 354             len = sh->a_buffer_len;
 355             break;
 356         }
 357         sh->a_buffer_len += ret;
 358     }
 359
 360     // Filter
 361     af_data_t filter_input = {
 362         .audio = sh->a_buffer,
 363         .len = len,
 364         .rate = sh->samplerate,
 365         .nch = sh->channels,
 366         .format = sh->sample_format
 367     };
 368     af_fix_parameters(&filter_input);
 369     af_data_t *filter_output = af_play(sh->afilter, &filter_input);
 370     if (!filter_output)
 371         return -1;
 372     set_min_out_buffer_size(outbuf, outbuf->len + filter_output->len);
 373     memcpy(outbuf->start + outbuf->len, filter_output->audio,
 374            filter_output->len);
 375     outbuf->len += filter_output->len;
 376
 377     // remove processed data from decoder buffer:
 378     sh->a_buffer_len -= len;
 379     memmove(sh->a_buffer, sh->a_buffer + len, sh->a_buffer_len);
 380
 381     return error;
 382 }
 383
 384 /* Try to get at least minlen decoded+filtered bytes in outbuf
 385  * (total length including possible existing data).
 386  * Return 0 on success, -1 on error/EOF (not distinguished).
 387  * In the former case outbuf->len is always >= minlen on return.
 388  * In case of EOF/error it might or might not be.
 389  * Outbuf.start must be talloc-allocated, and will be reallocated
 390  * if needed to fit all filter output. */
 391 int decode_audio(sh_audio_t *sh_audio, struct bstr *outbuf, int minlen)
 392 {
 393     // Indicates that a filter seems to be buffering large amounts of data
 394     int huge_filter_buffer = 0;
 395     // Decoded audio must be cut at boundaries of this many bytes
 396     int unitsize = sh_audio->channels * sh_audio->samplesize * 16;
 397
 398     /* Filter output size will be about filter_multiplier times input size.
 399      * If some filter buffers audio in big blocks this might only hold
 400      * as average over time. */
 401     double filter_multiplier = af_calc_filter_multiplier(sh_audio->afilter);
 402
 403     /* If the decoder set audio_out_minsize then it can do the equivalent of
 404      * "while (output_len < target_len) output_len += audio_out_minsize;",
 405      * so we must guarantee there is at least audio_out_minsize-1 bytes
 406      * more space in the output buffer than the minimum length we try to
 407      * decode. */
 408     int max_decode_len = sh_audio->a_buffer_size - sh_audio->audio_out_minsize;
 409     max_decode_len -= max_decode_len % unitsize;
 410
 411     while (outbuf->len < minlen) {
 412         int declen = (minlen - outbuf->len) / filter_multiplier
 413             + (unitsize << 5); // some extra for possible filter buffering
 414         if (huge_filter_buffer)
 415         /* Some filter must be doing significant buffering if the estimated
 416          * input length didn't produce enough output from filters.
 417          * Feed the filters 2k bytes at a time until we have enough output.
 418          * Very small amounts could make filtering inefficient while large
 419          * amounts can make MPlayer demux the file unnecessarily far ahead
 420          * to get audio data and buffer video frames in memory while doing
 421          * so. However the performance impact of either is probably not too
 422          * significant as long as the value is not completely insane. */
 423             declen = 2000;
 424         declen -= declen % unitsize;
 425         if (declen > max_decode_len)
 426             declen = max_decode_len;
 427         else
 428             /* if this iteration does not fill buffer, we must have lots
 429              * of buffering in filters */
 430             huge_filter_buffer = 1;
 431         int res = filter_n_bytes(sh_audio, outbuf, declen);
 432         if (res < 0)
 433             return res;
 434     }
 435     return 0;
 436 }
 437
 438 void decode_audio_prepend_bytes(struct bstr *outbuf, int count, int byte)
 439 {
 440     set_min_out_buffer_size(outbuf, outbuf->len + count);
 441     memmove(outbuf->start + count, outbuf->start, outbuf->len);
 442     memset(outbuf->start, byte, count);
 443     outbuf->len += count;
 444 }
 445
 446
 447 void resync_audio_stream(sh_audio_t *sh_audio)
 448 {
 449     sh_audio->a_in_buffer_len = 0;      // clear audio input buffer
 450     sh_audio->pts = MP_NOPTS_VALUE;
 451     if (!sh_audio->initialized)
 452         return;
 453     sh_audio->ad_driver->control(sh_audio, ADCTRL_RESYNC_STREAM, NULL);
 454 }
 455
 456 void skip_audio_frame(sh_audio_t *sh_audio)
 457 {
 458     if (!sh_audio->initialized)
 459         return;
 460     if (sh_audio->ad_driver->control(sh_audio, ADCTRL_SKIP_FRAME, NULL) ==
 461         CONTROL_TRUE)
 462         return;
 463     // default skip code:
 464     ds_fill_buffer(sh_audio->ds);       // skip block
 465 }