dec.c 12.4 KB
Newer Older
1
2
3
/*****************************************************************************
 * dec.c : audio output API towards decoders
 *****************************************************************************
4
 * Copyright (C) 2002-2007 the VideoLAN team
5
 * $Id$
6
7
8
9
10
11
12
 *
 * Authors: Christophe Massiot <massiot@via.ecp.fr>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
13
 *
14
15
16
17
18
19
20
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
dionoea's avatar
dionoea committed
21
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
22
23
24
25
26
27
28
29
30
31
32
33
34
35
 *****************************************************************************/

/*****************************************************************************
 * Preamble
 *****************************************************************************/
#include <stdlib.h>                            /* calloc(), malloc(), free() */
#include <string.h>

#include <vlc/vlc.h>

#ifdef HAVE_ALLOCA_H
#   include <alloca.h>
#endif

zorglub's avatar
zorglub committed
36
37
38
#include <vlc_aout.h>
#include <vlc_input.h>

39
40
#include "aout_internal.h"

zorglub's avatar
zorglub committed
41
42
/** FIXME: Ugly but needed to access the counters */
#include "input/input_internal.h"
43
44
45
46

/*****************************************************************************
 * aout_DecNew : create a decoder
 *****************************************************************************/
gbazin's avatar
   
gbazin committed
47
static aout_input_t * DecNew( vlc_object_t * p_this, aout_instance_t * p_aout,
48
49
50
                              audio_sample_format_t * p_format )
{
    aout_input_t * p_input;
gbazin's avatar
   
gbazin committed
51
    input_thread_t * p_input_thread;
gbazin's avatar
   
gbazin committed
52
    vlc_value_t val;
53

54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
    /* Sanitize audio format */
    if( p_format->i_channels > 32 )
    {
        msg_Err( p_aout, "too many audio channels (%u)",
                 p_format->i_channels );
        goto error;
    }

    if( p_format->i_rate > 192000 )
    {
        msg_Err( p_aout, "excessive audio sample frequency (%u)",
                 p_format->i_rate );
        goto error;
    }

69
70
71
72
73
74
75
    /* We can only be called by the decoder, so no need to lock
     * p_input->lock. */
    vlc_mutex_lock( &p_aout->mixer_lock );

    if ( p_aout->i_nb_inputs >= AOUT_MAX_INPUTS )
    {
        msg_Err( p_aout, "too many inputs already (%d)", p_aout->i_nb_inputs );
Rémi Denis-Courmont's avatar
Rémi Denis-Courmont committed
76
        goto error;
77
78
79
80
81
82
    }

    p_input = malloc(sizeof(aout_input_t));
    if ( p_input == NULL )
    {
        msg_Err( p_aout, "out of memory" );
Rémi Denis-Courmont's avatar
Rémi Denis-Courmont committed
83
        goto error;
84
85
86
87
88
89
    }

    vlc_mutex_init( p_aout, &p_input->lock );

    p_input->b_changed = 0;
    p_input->b_error = 1;
gbazin's avatar
   
gbazin committed
90
    aout_FormatPrepare( p_format );
91
92
93
94
95
96
97
98
99
100
    memcpy( &p_input->input, p_format,
            sizeof(audio_sample_format_t) );

    p_aout->pp_inputs[p_aout->i_nb_inputs] = p_input;
    p_aout->i_nb_inputs++;

    if ( p_aout->mixer.b_error )
    {
        int i;

gbazin's avatar
   
gbazin committed
101
102
        var_Destroy( p_aout, "audio-device" );
        var_Destroy( p_aout, "audio-channels" );
103

104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
        /* Recreate the output using the new format. */
        if ( aout_OutputNew( p_aout, p_format ) < 0 )
        {
            for ( i = 0; i < p_aout->i_nb_inputs - 1; i++ )
            {
                vlc_mutex_lock( &p_aout->pp_inputs[i]->lock );
                aout_InputDelete( p_aout, p_aout->pp_inputs[i] );
                vlc_mutex_unlock( &p_aout->pp_inputs[i]->lock );
            }
            vlc_mutex_unlock( &p_aout->mixer_lock );
            return p_input;
        }

        /* Create other input streams. */
        for ( i = 0; i < p_aout->i_nb_inputs - 1; i++ )
        {
            vlc_mutex_lock( &p_aout->pp_inputs[i]->lock );
            aout_InputDelete( p_aout, p_aout->pp_inputs[i] );
            aout_InputNew( p_aout, p_aout->pp_inputs[i] );
            vlc_mutex_unlock( &p_aout->pp_inputs[i]->lock );
        }
    }
    else
    {
        aout_MixerDelete( p_aout );
    }

    if ( aout_MixerNew( p_aout ) == -1 )
    {
        aout_OutputDelete( p_aout );
Rémi Denis-Courmont's avatar
Rémi Denis-Courmont committed
134
        goto error;
135
136
137
138
139
    }

    aout_InputNew( p_aout, p_input );

    vlc_mutex_unlock( &p_aout->mixer_lock );
gbazin's avatar
   
gbazin committed
140
141
142
143
    var_Create( p_this, "audio-desync", VLC_VAR_INTEGER | VLC_VAR_DOINHERIT );
    var_Get( p_this, "audio-desync", &val );
    p_input->i_desync = val.i_int * 1000;

gbazin's avatar
   
gbazin committed
144
145
146
147
    p_input_thread = (input_thread_t *)vlc_object_find( p_this,
                                           VLC_OBJECT_INPUT, FIND_PARENT );
    if( p_input_thread )
    {
gbazin's avatar
   
gbazin committed
148
149
        p_input->i_pts_delay = p_input_thread->i_pts_delay;
        p_input->i_pts_delay += p_input->i_desync;
zorglub's avatar
zorglub committed
150
        p_input->p_input_thread = p_input_thread;
gbazin's avatar
   
gbazin committed
151
152
153
154
        vlc_object_release( p_input_thread );
    }
    else
    {
gbazin's avatar
   
gbazin committed
155
156
        p_input->i_pts_delay = DEFAULT_PTS_DELAY;
        p_input->i_pts_delay += p_input->i_desync;
zorglub's avatar
zorglub committed
157
        p_input->p_input_thread = NULL;
gbazin's avatar
   
gbazin committed
158
159
    }

160
    return p_input;
Rémi Denis-Courmont's avatar
Rémi Denis-Courmont committed
161
162
163
164

error:
    vlc_mutex_unlock( &p_aout->mixer_lock );
    return NULL;
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
}

aout_input_t * __aout_DecNew( vlc_object_t * p_this,
                              aout_instance_t ** pp_aout,
                              audio_sample_format_t * p_format )
{
    if ( *pp_aout == NULL )
    {
        /* Create an audio output if there is none. */
        *pp_aout = vlc_object_find( p_this, VLC_OBJECT_AOUT, FIND_ANYWHERE );

        if( *pp_aout == NULL )
        {
            msg_Dbg( p_this, "no aout present, spawning one" );

            *pp_aout = aout_New( p_this );
            /* Everything failed, I'm a loser, I just wanna die */
            if( *pp_aout == NULL )
            {
                return NULL;
            }
186
            vlc_object_attach( *pp_aout, p_this->p_libvlc );
187
188
189
190
191
192
193
        }
        else
        {
            vlc_object_release( *pp_aout );
        }
    }

gbazin's avatar
   
gbazin committed
194
    return DecNew( p_this, *pp_aout, p_format );
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
}

/*****************************************************************************
 * aout_DecDelete : delete a decoder
 *****************************************************************************/
int aout_DecDelete( aout_instance_t * p_aout, aout_input_t * p_input )
{
    int i_input;

    /* This function can only be called by the decoder itself, so no need
     * to lock p_input->lock. */
    vlc_mutex_lock( &p_aout->mixer_lock );

    for ( i_input = 0; i_input < p_aout->i_nb_inputs; i_input++ )
    {
        if ( p_aout->pp_inputs[i_input] == p_input )
        {
            break;
        }
    }

    if ( i_input == p_aout->i_nb_inputs )
    {
        msg_Err( p_aout, "cannot find an input to delete" );
        return -1;
    }

    /* Remove the input from the list. */
    memmove( &p_aout->pp_inputs[i_input], &p_aout->pp_inputs[i_input + 1],
             (AOUT_MAX_INPUTS - i_input - 1) * sizeof(aout_input_t *) );
    p_aout->i_nb_inputs--;

    aout_InputDelete( p_aout, p_input );

    vlc_mutex_destroy( &p_input->lock );
    free( p_input );

    if ( !p_aout->i_nb_inputs )
    {
        aout_OutputDelete( p_aout );
        aout_MixerDelete( p_aout );
236
237
238
239
240
241
242
243
        if ( var_Type( p_aout, "audio-device" ) != 0 )
        {
            var_Destroy( p_aout, "audio-device" );
        }
        if ( var_Type( p_aout, "audio-channels" ) != 0 )
        {
            var_Destroy( p_aout, "audio-channels" );
        }
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
    }

    vlc_mutex_unlock( &p_aout->mixer_lock );

    return 0;
}


/*
 * Buffer management
 */

/*****************************************************************************
 * aout_DecNewBuffer : ask for a new empty buffer
 *****************************************************************************/
aout_buffer_t * aout_DecNewBuffer( aout_instance_t * p_aout,
                                   aout_input_t * p_input,
                                   size_t i_nb_samples )
{
    aout_buffer_t * p_buffer;
    mtime_t duration;

    vlc_mutex_lock( &p_input->lock );

    if ( p_input->b_error )
    {
        vlc_mutex_unlock( &p_input->lock );
        return NULL;
    }

    duration = (1000000 * (mtime_t)i_nb_samples) / p_input->input.i_rate;

    /* This necessarily allocates in the heap. */
    aout_BufferAlloc( &p_input->input_alloc, duration, NULL, p_buffer );
    p_buffer->i_nb_samples = i_nb_samples;
    p_buffer->i_nb_bytes = i_nb_samples * p_input->input.i_bytes_per_frame
                              / p_input->input.i_frame_length;

    /* Suppose the decoder doesn't have more than one buffered buffer */
    p_input->b_changed = 0;

    vlc_mutex_unlock( &p_input->lock );

    if ( p_buffer == NULL )
    {
        msg_Err( p_aout, "NULL buffer !" );
    }
    else
    {
        p_buffer->start_date = p_buffer->end_date = 0;
    }

    return p_buffer;
}

/*****************************************************************************
 * aout_DecDeleteBuffer : destroy an undecoded buffer
 *****************************************************************************/
void aout_DecDeleteBuffer( aout_instance_t * p_aout, aout_input_t * p_input,
                           aout_buffer_t * p_buffer )
{
305
    (void)p_aout; (void)p_input;
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
    aout_BufferFree( p_buffer );
}

/*****************************************************************************
 * aout_DecPlay : filter & mix the decoded buffer
 *****************************************************************************/
int aout_DecPlay( aout_instance_t * p_aout, aout_input_t * p_input,
                  aout_buffer_t * p_buffer )
{
    if ( p_buffer->start_date == 0 )
    {
        msg_Warn( p_aout, "non-dated buffer received" );
        aout_BufferFree( p_buffer );
        return -1;
    }

gbazin's avatar
   
gbazin committed
322
    /* Apply the desynchronisation requested by the user */
gbazin's avatar
   
gbazin committed
323
324
    p_buffer->start_date += p_input->i_desync;
    p_buffer->end_date += p_input->i_desync;
gbazin's avatar
   
gbazin committed
325

gbazin's avatar
   
gbazin committed
326
    if ( p_buffer->start_date > mdate() + p_input->i_pts_delay +
gbazin's avatar
   
gbazin committed
327
         AOUT_MAX_ADVANCE_TIME )
328
329
330
    {
        msg_Warn( p_aout, "received buffer in the future ("I64Fd")",
                  p_buffer->start_date - mdate());
zorglub's avatar
zorglub committed
331
332
        if( p_input->p_input_thread )
        {
zorglub's avatar
zorglub committed
333
            vlc_mutex_lock( &p_input->p_input_thread->p->counters.counters_lock);
334
            stats_UpdateInteger( p_aout,
zorglub's avatar
zorglub committed
335
                           p_input->p_input_thread->p->counters.p_lost_abuffers,
336
                           1, NULL );
zorglub's avatar
zorglub committed
337
            vlc_mutex_unlock( &p_input->p_input_thread->p->counters.counters_lock);
zorglub's avatar
zorglub committed
338
        }
339
340
341
342
        aout_BufferFree( p_buffer );
        return -1;
    }

343
    p_buffer->end_date = p_buffer->start_date
344
                            + (mtime_t)p_buffer->i_nb_samples * 1000000
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
                                / p_input->input.i_rate;

    vlc_mutex_lock( &p_input->lock );

    if ( p_input->b_error )
    {
        vlc_mutex_unlock( &p_input->lock );
        aout_BufferFree( p_buffer );
        return -1;
    }

    if ( p_input->b_changed )
    {
        /* Maybe the allocation size has changed. Re-allocate a buffer. */
        aout_buffer_t * p_new_buffer;
        mtime_t duration = (1000000 * (mtime_t)p_buffer->i_nb_samples)
                            / p_input->input.i_rate;

        aout_BufferAlloc( &p_input->input_alloc, duration, NULL, p_new_buffer );
364
        p_aout->p_libvlc->pf_memcpy( p_new_buffer->p_buffer, p_buffer->p_buffer,
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
                                  p_buffer->i_nb_bytes );
        p_new_buffer->i_nb_samples = p_buffer->i_nb_samples;
        p_new_buffer->i_nb_bytes = p_buffer->i_nb_bytes;
        p_new_buffer->start_date = p_buffer->start_date;
        p_new_buffer->end_date = p_buffer->end_date;
        aout_BufferFree( p_buffer );
        p_buffer = p_new_buffer;
        p_input->b_changed = 0;
    }

    /* If the buffer is too early, wait a while. */
    mwait( p_buffer->start_date - AOUT_MAX_PREPARE_TIME );

    if ( aout_InputPlay( p_aout, p_input, p_buffer ) == -1 )
    {
        vlc_mutex_unlock( &p_input->lock );
        return -1;
    }

    vlc_mutex_unlock( &p_input->lock );

    /* Run the mixer if it is able to run. */
    vlc_mutex_lock( &p_aout->mixer_lock );
    aout_MixerRun( p_aout );
zorglub's avatar
zorglub committed
389
390
    if( p_input->p_input_thread )
    {
zorglub's avatar
zorglub committed
391
        vlc_mutex_lock( &p_input->p_input_thread->p->counters.counters_lock);
392
        stats_UpdateInteger( p_aout,
zorglub's avatar
zorglub committed
393
                             p_input->p_input_thread->p->counters.p_played_abuffers,
394
                             1, NULL );
zorglub's avatar
zorglub committed
395
        vlc_mutex_unlock( &p_input->p_input_thread->p->counters.counters_lock);
zorglub's avatar
zorglub committed
396
    }
397
398
399
400
    vlc_mutex_unlock( &p_aout->mixer_lock );

    return 0;
}