src/audio_output/dec.c

   1 /*****************************************************************************
   2  * dec.c : audio output API towards decoders
   3  *****************************************************************************
   4  * Copyright (C) 2002-2007 the VideoLAN team
   5  * $Id$
   6  *
   7  * Authors: Christophe Massiot <massiot@via.ecp.fr>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  22  *****************************************************************************/
  23
  24 /*****************************************************************************
  25  * Preamble
  26  *****************************************************************************/
  27 #ifdef HAVE_CONFIG_H
  28 # include "config.h"
  29 #endif
  30
  31 #include <assert.h>
  32
  33 #include <vlc_common.h>
  34
  35 #include <vlc_aout.h>
  36 #include <vlc_input.h>
  37
  38 #include "aout_internal.h"
  39
  40 /*****************************************************************************
  41  * aout_DecNew : create a decoder
  42  *****************************************************************************/
  43 static aout_input_t * DecNew( aout_instance_t * p_aout,
  44                               audio_sample_format_t *p_format,
  45                               const audio_replay_gain_t *p_replay_gain,
  46                               const aout_request_vout_t *p_request_vout )
  47 {
  48     aout_input_t * p_input;
  49
  50     /* Sanitize audio format */
  51     if( p_format->i_channels > 32 )
  52     {
  53         msg_Err( p_aout, "too many audio channels (%u)",
  54                  p_format->i_channels );
  55         return NULL;
  56     }
  57     if( p_format->i_channels <= 0 )
  58     {
  59         msg_Err( p_aout, "no audio channels" );
  60         return NULL;
  61     }
  62     if( p_format->i_channels != aout_FormatNbChannels( p_format ) )
  63     {
  64         msg_Err( p_aout, "incompatible audio channels count with layout mask" );
  65         return NULL;
  66     }
  67
  68     if( p_format->i_rate > 192000 )
  69     {
  70         msg_Err( p_aout, "excessive audio sample frequency (%u)",
  71                  p_format->i_rate );
  72         return NULL;
  73     }
  74     if( p_format->i_rate < 4000 )
  75     {
  76         msg_Err( p_aout, "too low audio sample frequency (%u)",
  77                  p_format->i_rate );
  78         return NULL;
  79     }
  80
  81     /* We can only be called by the decoder, so no need to lock
  82      * p_input->lock. */
  83     aout_lock_mixer( p_aout );
  84
  85     if ( p_aout->i_nb_inputs >= AOUT_MAX_INPUTS )
  86     {
  87         msg_Err( p_aout, "too many inputs already (%d)", p_aout->i_nb_inputs );
  88         goto error;
  89     }
  90
  91     p_input = calloc( 1, sizeof(aout_input_t));
  92     if( !p_input )
  93         goto error;
  94
  95     vlc_mutex_init( &p_input->lock );
  96
  97     p_input->b_changed = false;
  98     p_input->b_error = true;
  99     p_input->b_paused = false;
 100     p_input->i_pause_date = 0;
 101
 102     aout_FormatPrepare( p_format );
 103
 104     memcpy( &p_input->input, p_format,
 105             sizeof(audio_sample_format_t) );
 106     if( p_replay_gain )
 107         p_input->replay_gain = *p_replay_gain;
 108
 109     aout_lock_input_fifos( p_aout );
 110     p_aout->pp_inputs[p_aout->i_nb_inputs] = p_input;
 111     p_aout->i_nb_inputs++;
 112
 113     if ( !p_aout->p_mixer )
 114     {
 115         int i;
 116
 117         var_Destroy( p_aout, "audio-device" );
 118         var_Destroy( p_aout, "audio-channels" );
 119
 120         /* Recreate the output using the new format. */
 121         if ( aout_OutputNew( p_aout, p_format ) < 0 )
 122         {
 123             for ( i = 0; i < p_aout->i_nb_inputs - 1; i++ )
 124             {
 125                 aout_lock_input( p_aout, p_aout->pp_inputs[i] );
 126                 aout_InputDelete( p_aout, p_aout->pp_inputs[i] );
 127                 aout_unlock_input( p_aout, p_aout->pp_inputs[i] );
 128             }
 129             aout_unlock_input_fifos( p_aout );
 130             aout_unlock_mixer( p_aout );
 131             return p_input;
 132         }
 133
 134         /* Create other input streams. */
 135         for ( i = 0; i < p_aout->i_nb_inputs - 1; i++ )
 136         {
 137             aout_input_t *p_input = p_aout->pp_inputs[i];
 138
 139             aout_lock_input( p_aout, p_input );
 140             aout_InputDelete( p_aout, p_input );
 141             aout_InputNew( p_aout, p_input, &p_input->request_vout );
 142             aout_unlock_input( p_aout, p_input );
 143         }
 144     }
 145     else
 146     {
 147         aout_MixerDelete( p_aout );
 148     }
 149
 150     if ( aout_MixerNew( p_aout ) == -1 )
 151     {
 152         aout_OutputDelete( p_aout );
 153         aout_unlock_input_fifos( p_aout );
 154         goto error;
 155     }
 156
 157     aout_InputNew( p_aout, p_input, p_request_vout );
 158     aout_unlock_input_fifos( p_aout );
 159
 160     aout_unlock_mixer( p_aout );
 161
 162     return p_input;
 163
 164 error:
 165     aout_unlock_mixer( p_aout );
 166     return NULL;
 167 }
 168
 169 aout_input_t * __aout_DecNew( vlc_object_t * p_this,
 170                               aout_instance_t ** pp_aout,
 171                               audio_sample_format_t * p_format,
 172                               const audio_replay_gain_t *p_replay_gain,
 173                               const aout_request_vout_t *p_request_video )
 174 {
 175     aout_instance_t *p_aout = *pp_aout;
 176     if ( p_aout == NULL )
 177     {
 178         msg_Dbg( p_this, "no aout present, spawning one" );
 179         p_aout = aout_New( p_this );
 180
 181         /* Everything failed, I'm a loser, I just wanna die */
 182         if( p_aout == NULL )
 183             return NULL;
 184
 185         vlc_object_attach( p_aout, p_this );
 186         *pp_aout = p_aout;
 187     }
 188
 189     return DecNew( p_aout, p_format, p_replay_gain, p_request_video );
 190 }
 191
 192 /*****************************************************************************
 193  * aout_DecDelete : delete a decoder
 194  *****************************************************************************/
 195 int aout_DecDelete( aout_instance_t * p_aout, aout_input_t * p_input )
 196 {
 197     int i_input;
 198
 199     /* This function can only be called by the decoder itself, so no need
 200      * to lock p_input->lock. */
 201     aout_lock_mixer( p_aout );
 202
 203     for ( i_input = 0; i_input < p_aout->i_nb_inputs; i_input++ )
 204     {
 205         if ( p_aout->pp_inputs[i_input] == p_input )
 206         {
 207             break;
 208         }
 209     }
 210
 211     if ( i_input == p_aout->i_nb_inputs )
 212     {
 213         msg_Err( p_aout, "cannot find an input to delete" );
 214         aout_unlock_mixer( p_aout );
 215         return -1;
 216     }
 217
 218     /* Remove the input from the list. */
 219     memmove( &p_aout->pp_inputs[i_input], &p_aout->pp_inputs[i_input + 1],
 220              (AOUT_MAX_INPUTS - i_input - 1) * sizeof(aout_input_t *) );
 221     p_aout->i_nb_inputs--;
 222
 223     aout_InputDelete( p_aout, p_input );
 224
 225     vlc_mutex_destroy( &p_input->lock );
 226     free( p_input );
 227
 228     if ( !p_aout->i_nb_inputs )
 229     {
 230         aout_OutputDelete( p_aout );
 231         aout_MixerDelete( p_aout );
 232         var_Destroy( p_aout, "audio-device" );
 233         var_Destroy( p_aout, "audio-channels" );
 234     }
 235
 236     aout_unlock_mixer( p_aout );
 237
 238     return 0;
 239 }
 240
 241
 242 /*
 243  * Buffer management
 244  */
 245
 246 /*****************************************************************************
 247  * aout_DecNewBuffer : ask for a new empty buffer
 248  *****************************************************************************/
 249 aout_buffer_t * aout_DecNewBuffer( aout_input_t * p_input,
 250                                    size_t i_nb_samples )
 251 {
 252     aout_buffer_t * p_buffer;
 253     mtime_t duration;
 254
 255     aout_lock_input( NULL, p_input );
 256
 257     if ( p_input->b_error )
 258     {
 259         aout_unlock_input( NULL, p_input );
 260         return NULL;
 261     }
 262
 263     duration = (1000000 * (mtime_t)i_nb_samples) / p_input->input.i_rate;
 264
 265     /* This necessarily allocates in the heap. */
 266     p_buffer = aout_BufferAlloc( &p_input->input_alloc, duration, NULL );
 267     if( p_buffer != NULL )
 268         p_buffer->i_buffer = i_nb_samples * p_input->input.i_bytes_per_frame
 269                                   / p_input->input.i_frame_length;
 270
 271     /* Suppose the decoder doesn't have more than one buffered buffer */
 272     p_input->b_changed = false;
 273
 274     aout_unlock_input( NULL, p_input );
 275
 276     if( p_buffer == NULL )
 277         return NULL;
 278
 279     p_buffer->i_nb_samples = i_nb_samples;
 280     p_buffer->i_pts = p_buffer->i_length = 0;
 281     return p_buffer;
 282 }
 283
 284 /*****************************************************************************
 285  * aout_DecDeleteBuffer : destroy an undecoded buffer
 286  *****************************************************************************/
 287 void aout_DecDeleteBuffer( aout_instance_t * p_aout, aout_input_t * p_input,
 288                            aout_buffer_t * p_buffer )
 289 {
 290     (void)p_aout; (void)p_input;
 291     aout_BufferFree( p_buffer );
 292 }
 293
 294 /*****************************************************************************
 295  * aout_DecPlay : filter & mix the decoded buffer
 296  *****************************************************************************/
 297 int aout_DecPlay( aout_instance_t * p_aout, aout_input_t * p_input,
 298                   aout_buffer_t * p_buffer, int i_input_rate )
 299 {
 300     assert( i_input_rate >= INPUT_RATE_DEFAULT / AOUT_MAX_INPUT_RATE &&
 301             i_input_rate <= INPUT_RATE_DEFAULT * AOUT_MAX_INPUT_RATE );
 302
 303     assert( p_buffer->i_pts > 0 );
 304
 305     p_buffer->i_length = (mtime_t)p_buffer->i_nb_samples * 1000000
 306                                 / p_input->input.i_rate;
 307
 308     aout_lock_mixer( p_aout );
 309     aout_lock_input( p_aout, p_input );
 310
 311     if( p_input->b_error )
 312     {
 313         aout_unlock_input( p_aout, p_input );
 314         aout_unlock_mixer( p_aout );
 315
 316         aout_BufferFree( p_buffer );
 317         return -1;
 318     }
 319
 320     if( p_input->b_changed )
 321     {
 322         /* Maybe the allocation size has changed. Re-allocate a buffer. */
 323         aout_buffer_t * p_new_buffer;
 324         mtime_t duration = (1000000 * (mtime_t)p_buffer->i_nb_samples)
 325                             / p_input->input.i_rate;
 326
 327         p_new_buffer = aout_BufferAlloc( &p_input->input_alloc, duration, NULL);
 328         vlc_memcpy( p_new_buffer->p_buffer, p_buffer->p_buffer,
 329                     p_buffer->i_buffer );
 330         p_new_buffer->i_nb_samples = p_buffer->i_nb_samples;
 331         p_new_buffer->i_buffer = p_buffer->i_buffer;
 332         p_new_buffer->i_pts = p_buffer->i_pts;
 333         p_new_buffer->i_length = p_buffer->i_length;
 334         aout_BufferFree( p_buffer );
 335         p_buffer = p_new_buffer;
 336         p_input->b_changed = false;
 337     }
 338
 339     aout_InputCheckAndRestart( p_aout, p_input );
 340     aout_unlock_mixer( p_aout );
 341
 342     int i_ret = aout_InputPlay( p_aout, p_input, p_buffer, i_input_rate );
 343
 344     aout_unlock_input( p_aout, p_input );
 345
 346     if( i_ret == -1 )
 347         return -1;
 348
 349     /* Run the mixer if it is able to run. */
 350     aout_lock_mixer( p_aout );
 351
 352     aout_MixerRun( p_aout );
 353
 354     aout_unlock_mixer( p_aout );
 355
 356     return 0;
 357 }
 358
 359 int aout_DecGetResetLost( aout_instance_t *p_aout, aout_input_t *p_input )
 360 {
 361     aout_lock_input( p_aout, p_input );
 362     int i_value = p_input->i_buffer_lost;
 363     p_input->i_buffer_lost = 0;
 364     aout_unlock_input( p_aout, p_input );
 365
 366     return i_value;
 367 }
 368
 369 void aout_DecChangePause( aout_instance_t *p_aout, aout_input_t *p_input, bool b_paused, mtime_t i_date )
 370 {
 371     mtime_t i_duration = 0;
 372     aout_lock_input( p_aout, p_input );
 373     assert( !p_input->b_paused || !b_paused );
 374     if( p_input->b_paused )
 375     {
 376         i_duration = i_date - p_input->i_pause_date;
 377     }
 378     p_input->b_paused = b_paused;
 379     p_input->i_pause_date = i_date;
 380     aout_unlock_input( p_aout, p_input );
 381
 382     if( i_duration != 0 )
 383     {
 384         aout_lock_mixer( p_aout );
 385         for( aout_buffer_t *p = p_input->mixer.fifo.p_first; p != NULL; p = p->p_next )
 386         {
 387             p->i_pts += i_duration;
 388         }
 389         aout_unlock_mixer( p_aout );
 390     }
 391 }
 392
 393 void aout_DecFlush( aout_instance_t *p_aout, aout_input_t *p_input )
 394 {
 395     aout_lock_input_fifos( p_aout );
 396
 397     aout_FifoSet( p_aout, &p_input->mixer.fifo, 0 );
 398     p_input->mixer.begin = NULL;
 399
 400     aout_unlock_input_fifos( p_aout );
 401 }
 402