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 int fakemono = 0;
  41
  42 af_cfg_t af_cfg = { 1, NULL };  // Configuration for audio filters
  43
  44 void afm_help(void)
  45 {
  46     int i;
  47     mp_tmsg(MSGT_DECAUDIO, MSGL_INFO, "Available (compiled-in) audio codec families/drivers:\n");
  48     mp_msg(MSGT_IDENTIFY, MSGL_INFO, "ID_AUDIO_DRIVERS\n");
  49     mp_msg(MSGT_DECAUDIO, MSGL_INFO, "    afm:    info:  (comment)\n");
  50     for (i = 0; mpcodecs_ad_drivers[i] != NULL; i++)
  51         if (mpcodecs_ad_drivers[i]->info->comment
  52             && mpcodecs_ad_drivers[i]->info->comment[0])
  53             mp_msg(MSGT_DECAUDIO, MSGL_INFO, "%9s  %s (%s)\n",
  54                    mpcodecs_ad_drivers[i]->info->short_name,
  55                    mpcodecs_ad_drivers[i]->info->name,
  56                    mpcodecs_ad_drivers[i]->info->comment);
  57         else
  58             mp_msg(MSGT_DECAUDIO, MSGL_INFO, "%9s  %s\n",
  59                    mpcodecs_ad_drivers[i]->info->short_name,
  60                    mpcodecs_ad_drivers[i]->info->name);
  61 }
  62
  63 static int init_audio_codec(sh_audio_t *sh_audio)
  64 {
  65     assert(!sh_audio->initialized);
  66     resync_audio_stream(sh_audio);
  67     if ((af_cfg.force & AF_INIT_FORMAT_MASK) == AF_INIT_FLOAT) {
  68         int fmt = AF_FORMAT_FLOAT_NE;
  69         if (sh_audio->ad_driver->control(sh_audio, ADCTRL_QUERY_FORMAT,
  70                                          &fmt) == CONTROL_TRUE) {
  71             sh_audio->sample_format = fmt;
  72             sh_audio->samplesize = 4;
  73         }
  74     }
  75     sh_audio->audio_out_minsize = 8192; // default, preinit() may change it
  76     if (!sh_audio->ad_driver->preinit(sh_audio)) {
  77         mp_tmsg(MSGT_DECAUDIO, MSGL_ERR, "ADecoder preinit failed :(\n");
  78         return 0;
  79     }
  80
  81     /* allocate audio in buffer: */
  82     if (sh_audio->audio_in_minsize > 0) {
  83         sh_audio->a_in_buffer_size = sh_audio->audio_in_minsize;
  84         mp_tmsg(MSGT_DECAUDIO, MSGL_V, "dec_audio: Allocating %d bytes for input buffer.\n",
  85                sh_audio->a_in_buffer_size);
  86         sh_audio->a_in_buffer = av_mallocz(sh_audio->a_in_buffer_size);
  87     }
  88
  89     const int base_size = 65536;
  90     // At least 64 KiB plus rounding up to next decodable unit size
  91     sh_audio->a_buffer_size = base_size + sh_audio->audio_out_minsize;
  92
  93     mp_tmsg(MSGT_DECAUDIO, MSGL_V, "dec_audio: Allocating %d + %d = %d bytes for output buffer.\n",
  94            sh_audio->audio_out_minsize, base_size, sh_audio->a_buffer_size);
  95
  96     sh_audio->a_buffer = av_mallocz(sh_audio->a_buffer_size);
  97     if (!sh_audio->a_buffer)
  98         abort();
  99     sh_audio->a_buffer_len = 0;
 100
 101     if (!sh_audio->ad_driver->init(sh_audio)) {
 102         mp_tmsg(MSGT_DECAUDIO, MSGL_V, "ADecoder init failed :(\n");
 103         uninit_audio(sh_audio); // free buffers
 104         return 0;
 105     }
 106
 107     sh_audio->initialized = 1;
 108
 109     if (!sh_audio->channels || !sh_audio->samplerate) {
 110         mp_tmsg(MSGT_DECAUDIO, MSGL_ERR, "Audio decoder did not specify "
 111                 "audio format!\n");
 112         uninit_audio(sh_audio); // free buffers
 113         return 0;
 114     }
 115
 116     if (!sh_audio->o_bps)
 117         sh_audio->o_bps = sh_audio->channels * sh_audio->samplerate
 118                           * sh_audio->samplesize;
 119     return 1;
 120 }
 121
 122 static int init_audio(sh_audio_t *sh_audio, char *codecname, char *afm,
 123                       int status, stringset_t *selected)
 124 {
 125     unsigned int orig_fourcc = sh_audio->wf ? sh_audio->wf->wFormatTag : 0;
 126     int force = 0;
 127     if (codecname && codecname[0] == '+') {
 128         codecname = &codecname[1];
 129         force = 1;
 130     }
 131     sh_audio->codec = NULL;
 132     while (1) {
 133         const ad_functions_t *mpadec;
 134         int i;
 135         sh_audio->ad_driver = 0;
 136         // restore original fourcc:
 137         if (sh_audio->wf)
 138             sh_audio->wf->wFormatTag = i = orig_fourcc;
 139         if (!(sh_audio->codec = find_audio_codec(sh_audio->format,
 140                                                  sh_audio->wf ? (&i) : NULL,
 141                                                  sh_audio->codec, force)))
 142             break;
 143         if (sh_audio->wf)
 144             sh_audio->wf->wFormatTag = i;
 145         // ok we found one codec
 146         if (stringset_test(selected, sh_audio->codec->name))
 147             continue;   // already tried & failed
 148         if (codecname && strcmp(sh_audio->codec->name, codecname))
 149             continue;   // -ac
 150         if (afm && strcmp(sh_audio->codec->drv, afm))
 151             continue;   // afm doesn't match
 152         if (!force && sh_audio->codec->status < status)
 153             continue;   // too unstable
 154         stringset_add(selected, sh_audio->codec->name); // tagging it
 155         // ok, it matches all rules, let's find the driver!
 156         for (i = 0; mpcodecs_ad_drivers[i] != NULL; i++)
 157             if (!strcmp(mpcodecs_ad_drivers[i]->info->short_name,
 158                  sh_audio->codec->drv))
 159                 break;
 160         mpadec = mpcodecs_ad_drivers[i];
 161         if (!mpadec) {          // driver not available (==compiled in)
 162             mp_tmsg(MSGT_DECAUDIO, MSGL_ERR,
 163                    "Requested audio codec family [%s] (afm=%s) not available.\nEnable it at compilation.\n",
 164                    sh_audio->codec->name, sh_audio->codec->drv);
 165             continue;
 166         }
 167         // it's available, let's try to init!
 168         // init()
 169         mp_tmsg(MSGT_DECAUDIO, MSGL_V, "Opening audio decoder: [%s] %s\n",
 170                mpadec->info->short_name, mpadec->info->name);
 171         sh_audio->ad_driver = mpadec;
 172         if (!init_audio_codec(sh_audio)) {
 173             mp_tmsg(MSGT_DECAUDIO, MSGL_WARN, "Audio decoder init failed for "
 174                     "codecs.conf entry \"%s\".\n", sh_audio->codec->name);
 175             continue;           // try next...
 176         }
 177         // Yeah! We got it!
 178         return 1;
 179     }
 180     return 0;
 181 }
 182
 183 int init_best_audio_codec(sh_audio_t *sh_audio, char **audio_codec_list,
 184                           char **audio_fm_list)
 185 {
 186     stringset_t selected;
 187     char *ac_l_default[2] = { "", (char *) NULL };
 188     // hack:
 189     if (!audio_codec_list)
 190         audio_codec_list = ac_l_default;
 191     // Go through the codec.conf and find the best codec...
 192     sh_audio->initialized = 0;
 193     stringset_init(&selected);
 194     while (!sh_audio->initialized && *audio_codec_list) {
 195         char *audio_codec = *(audio_codec_list++);
 196         if (audio_codec[0]) {
 197             if (audio_codec[0] == '-') {
 198                 // disable this codec:
 199                 stringset_add(&selected, audio_codec + 1);
 200             } else {
 201                 // forced codec by name:
 202                 mp_tmsg(MSGT_DECAUDIO, MSGL_INFO, "Forced audio codec: %s\n",
 203                        audio_codec);
 204                 init_audio(sh_audio, audio_codec, NULL, -1, &selected);
 205             }
 206         } else {
 207             int status;
 208             // try in stability order: UNTESTED, WORKING, BUGGY.
 209             // never try CRASHING.
 210             if (audio_fm_list) {
 211                 char **fmlist = audio_fm_list;
 212                 // try first the preferred codec families:
 213                 while (!sh_audio->initialized && *fmlist) {
 214                     char *audio_fm = *(fmlist++);
 215                     mp_tmsg(MSGT_DECAUDIO, MSGL_INFO, "Trying to force audio codec driver family %s...\n",
 216                            audio_fm);
 217                     for (status = CODECS_STATUS__MAX;
 218                          status >= CODECS_STATUS__MIN; --status)
 219                         if (init_audio(sh_audio, NULL, audio_fm, status, &selected))
 220                             break;
 221                 }
 222             }
 223             if (!sh_audio->initialized)
 224                 for (status = CODECS_STATUS__MAX; status >= CODECS_STATUS__MIN;
 225                      --status)
 226                     if (init_audio(sh_audio, NULL, NULL, status, &selected))
 227                         break;
 228         }
 229     }
 230     stringset_free(&selected);
 231
 232     if (!sh_audio->initialized) {
 233         mp_tmsg(MSGT_DECAUDIO, MSGL_ERR, "Cannot find codec for audio format 0x%X.\n",
 234                sh_audio->format);
 235         return 0;   // failed
 236     }
 237
 238     mp_tmsg(MSGT_DECAUDIO, MSGL_INFO, "Selected audio codec: %s [%s]\n",
 239             sh_audio->codecname ? sh_audio->codecname : sh_audio->codec->info,
 240             sh_audio->ad_driver->info->print_name ?
 241             sh_audio->ad_driver->info->print_name :
 242             sh_audio->ad_driver->info->short_name);
 243     mp_tmsg(MSGT_DECAUDIO, MSGL_V,
 244             "Audio codecs.conf entry: %s (%s)  afm: %s\n",
 245            sh_audio->codec->name, sh_audio->codec->info, sh_audio->codec->drv);
 246     mp_msg(MSGT_DECAUDIO, MSGL_INFO,
 247            "AUDIO: %d Hz, %d ch, %s, %3.1f kbit/%3.2f%% (ratio: %d->%d)\n",
 248            sh_audio->samplerate, sh_audio->channels,
 249            af_fmt2str_short(sh_audio->sample_format),
 250            sh_audio->i_bps * 8 * 0.001,
 251            ((float) sh_audio->i_bps / sh_audio->o_bps) * 100.0,
 252            sh_audio->i_bps, sh_audio->o_bps);
 253     mp_msg(MSGT_IDENTIFY, MSGL_INFO,
 254            "ID_AUDIO_BITRATE=%d\nID_AUDIO_RATE=%d\n" "ID_AUDIO_NCH=%d\n",
 255            sh_audio->i_bps * 8, sh_audio->samplerate, sh_audio->channels);
 256
 257     return 1;   // success
 258 }
 259
 260 void uninit_audio(sh_audio_t *sh_audio)
 261 {
 262     if (sh_audio->afilter) {
 263         mp_msg(MSGT_DECAUDIO, MSGL_V, "Uninit audio filters...\n");
 264         af_uninit(sh_audio->afilter);
 265         free(sh_audio->afilter);
 266         sh_audio->afilter = NULL;
 267     }
 268     if (sh_audio->initialized) {
 269         mp_tmsg(MSGT_DECAUDIO, MSGL_V, "Uninit audio: %s\n",
 270                sh_audio->codec->drv);
 271         sh_audio->ad_driver->uninit(sh_audio);
 272         sh_audio->initialized = 0;
 273     }
 274     av_freep(&sh_audio->a_buffer);
 275     av_freep(&sh_audio->a_in_buffer);
 276 }
 277
 278
 279 int init_audio_filters(sh_audio_t *sh_audio, int in_samplerate,
 280                        int *out_samplerate, int *out_channels, int *out_format)
 281 {
 282     af_stream_t *afs = sh_audio->afilter;
 283     if (!afs) {
 284         afs = calloc(1, sizeof(struct af_stream));
 285         afs->opts = sh_audio->opts;
 286     }
 287     // input format: same as codec's output format:
 288     afs->input.rate   = in_samplerate;
 289     afs->input.nch    = sh_audio->channels;
 290     afs->input.format = sh_audio->sample_format;
 291     af_fix_parameters(&(afs->input));
 292
 293     // output format: same as ao driver's input format (if missing, fallback to input)
 294     afs->output.rate   = *out_samplerate;
 295     afs->output.nch    = *out_channels;
 296     afs->output.format = *out_format;
 297     af_fix_parameters(&(afs->output));
 298
 299     // filter config:
 300     memcpy(&afs->cfg, &af_cfg, sizeof(af_cfg_t));
 301
 302     mp_tmsg(MSGT_DECAUDIO, MSGL_V, "Building audio filter chain for %dHz/%dch/%s -> %dHz/%dch/%s...\n",
 303            afs->input.rate, afs->input.nch,
 304            af_fmt2str_short(afs->input.format), afs->output.rate,
 305            afs->output.nch, af_fmt2str_short(afs->output.format));
 306
 307     // let's autoprobe it!
 308     if (0 != af_init(afs)) {
 309         sh_audio->afilter = NULL;
 310         free(afs);
 311         return 0;   // failed :(
 312     }
 313
 314     *out_samplerate = afs->output.rate;
 315     *out_channels = afs->output.nch;
 316     *out_format = afs->output.format;
 317
 318     // ok!
 319     sh_audio->afilter = (void *) afs;
 320     return 1;
 321 }
 322
 323 static void set_min_out_buffer_size(struct bstr *outbuf, int len)
 324 {
 325     size_t oldlen = talloc_get_size(outbuf->start);
 326     if (oldlen < len) {
 327         assert(outbuf->start);  // talloc context should be already set
 328         mp_msg(MSGT_DECAUDIO, MSGL_V, "Increasing filtered audio buffer size "
 329                "from %zd to %d\n", oldlen, len);
 330         outbuf->start = talloc_realloc_size(NULL, outbuf->start, len);
 331     }
 332 }
 333
 334 static int filter_n_bytes(sh_audio_t *sh, struct bstr *outbuf, int len)
 335 {
 336     assert(len-1 + sh->audio_out_minsize <= sh->a_buffer_size);
 337
 338     int error = 0;
 339
 340     // Decode more bytes if needed
 341     int old_samplerate = sh->samplerate;
 342     int old_channels = sh->channels;
 343     int old_sample_format = sh->sample_format;
 344     while (sh->a_buffer_len < len) {
 345         unsigned char *buf = sh->a_buffer + sh->a_buffer_len;
 346         int minlen = len - sh->a_buffer_len;
 347         int maxlen = sh->a_buffer_size - sh->a_buffer_len;
 348         int ret = sh->ad_driver->decode_audio(sh, buf, minlen, maxlen);
 349         int format_change = sh->samplerate != old_samplerate
 350                             || sh->channels != old_channels
 351                             || sh->sample_format != old_sample_format;
 352         if (ret <= 0 || format_change) {
 353             error = format_change ? -2 : -1;
 354             // samples from format-changing call get discarded too
 355             len = sh->a_buffer_len;
 356             break;
 357         }
 358         sh->a_buffer_len += ret;
 359     }
 360
 361     // Filter
 362     af_data_t filter_input = {
 363         .audio = sh->a_buffer,
 364         .len = len,
 365         .rate = sh->samplerate,
 366         .nch = sh->channels,
 367         .format = sh->sample_format
 368     };
 369     af_fix_parameters(&filter_input);
 370     af_data_t *filter_output = af_play(sh->afilter, &filter_input);
 371     if (!filter_output)
 372         return -1;
 373     set_min_out_buffer_size(outbuf, outbuf->len + filter_output->len);
 374     memcpy(outbuf->start + outbuf->len, filter_output->audio,
 375            filter_output->len);
 376     outbuf->len += filter_output->len;
 377
 378     // remove processed data from decoder buffer:
 379     sh->a_buffer_len -= len;
 380     memmove(sh->a_buffer, sh->a_buffer + len, sh->a_buffer_len);
 381
 382     return error;
 383 }
 384
 385 /* Try to get at least minlen decoded+filtered bytes in outbuf
 386  * (total length including possible existing data).
 387  * Return 0 on success, -1 on error/EOF (not distinguished).
 388  * In the former case outbuf->len is always >= minlen on return.
 389  * In case of EOF/error it might or might not be.
 390  * Outbuf.start must be talloc-allocated, and will be reallocated
 391  * if needed to fit all filter output. */
 392 int decode_audio(sh_audio_t *sh_audio, struct bstr *outbuf, int minlen)
 393 {
 394     // Indicates that a filter seems to be buffering large amounts of data
 395     int huge_filter_buffer = 0;
 396     // Decoded audio must be cut at boundaries of this many bytes
 397     int unitsize = sh_audio->channels * sh_audio->samplesize * 16;
 398
 399     /* Filter output size will be about filter_multiplier times input size.
 400      * If some filter buffers audio in big blocks this might only hold
 401      * as average over time. */
 402     double filter_multiplier = af_calc_filter_multiplier(sh_audio->afilter);
 403
 404     /* If the decoder set audio_out_minsize then it can do the equivalent of
 405      * "while (output_len < target_len) output_len += audio_out_minsize;",
 406      * so we must guarantee there is at least audio_out_minsize-1 bytes
 407      * more space in the output buffer than the minimum length we try to
 408      * decode. */
 409     int max_decode_len = sh_audio->a_buffer_size - sh_audio->audio_out_minsize;
 410     max_decode_len -= max_decode_len % unitsize;
 411
 412     while (outbuf->len < minlen) {
 413         int declen = (minlen - outbuf->len) / filter_multiplier
 414             + (unitsize << 5); // some extra for possible filter buffering
 415         if (huge_filter_buffer)
 416         /* Some filter must be doing significant buffering if the estimated
 417          * input length didn't produce enough output from filters.
 418          * Feed the filters 2k bytes at a time until we have enough output.
 419          * Very small amounts could make filtering inefficient while large
 420          * amounts can make MPlayer demux the file unnecessarily far ahead
 421          * to get audio data and buffer video frames in memory while doing
 422          * so. However the performance impact of either is probably not too
 423          * significant as long as the value is not completely insane. */
 424             declen = 2000;
 425         declen -= declen % unitsize;
 426         if (declen > max_decode_len)
 427             declen = max_decode_len;
 428         else
 429             /* if this iteration does not fill buffer, we must have lots
 430              * of buffering in filters */
 431             huge_filter_buffer = 1;
 432         int res = filter_n_bytes(sh_audio, outbuf, declen);
 433         if (res < 0)
 434             return res;
 435     }
 436     return 0;
 437 }
 438
 439 void decode_audio_prepend_bytes(struct bstr *outbuf, int count, int byte)
 440 {
 441     set_min_out_buffer_size(outbuf, outbuf->len + count);
 442     memmove(outbuf->start + count, outbuf->start, outbuf->len);
 443     memset(outbuf->start, byte, count);
 444     outbuf->len += count;
 445 }
 446
 447
 448 void resync_audio_stream(sh_audio_t *sh_audio)
 449 {
 450     sh_audio->a_in_buffer_len = 0;      // clear audio input buffer
 451     sh_audio->pts = MP_NOPTS_VALUE;
 452     if (!sh_audio->initialized)
 453         return;
 454     sh_audio->ad_driver->control(sh_audio, ADCTRL_RESYNC_STREAM, NULL);
 455 }
 456
 457 void skip_audio_frame(sh_audio_t *sh_audio)
 458 {
 459     if (!sh_audio->initialized)
 460         return;
 461     if (sh_audio->ad_driver->control(sh_audio, ADCTRL_SKIP_FRAME, NULL) ==
 462         CONTROL_TRUE)
 463         return;
 464     // default skip code:
 465     ds_fill_buffer(sh_audio->ds);       // skip block
 466 }