1 /*****************************************************************************
2 * aout_internal.h : internal defines for audio output
3 *****************************************************************************
4 * Copyright (C) 2002 VideoLAN
5 * $Id: aout_internal.h,v 1.17 2002/09/16 20:46:37 massiot Exp $
7 * Authors: Christophe Massiot <massiot@via.ecp.fr>
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.
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.
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., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
22 *****************************************************************************/
24 /*****************************************************************************
25 * aout_alloc_t : allocation of memory in the audio output
26 *****************************************************************************/
27 typedef struct aout_alloc_t
33 #define AOUT_ALLOC_NONE 0
34 #define AOUT_ALLOC_STACK 1
35 #define AOUT_ALLOC_HEAP 2
37 #define aout_BufferAlloc( p_alloc, i_nb_usec, p_previous_buffer, \
39 if ( (p_alloc)->i_alloc_type == AOUT_ALLOC_NONE ) \
41 (p_new_buffer) = p_previous_buffer; \
46 i_alloc_size = (u64)(p_alloc)->i_bytes_per_sec \
47 * (i_nb_usec) / 1000000 + 1; \
48 if ( (p_alloc)->i_alloc_type == AOUT_ALLOC_STACK ) \
50 (p_new_buffer) = alloca( i_alloc_size + sizeof(aout_buffer_t) );\
54 (p_new_buffer) = malloc( i_alloc_size + sizeof(aout_buffer_t) );\
56 if ( p_new_buffer != NULL ) \
58 (p_new_buffer)->i_alloc_type = (p_alloc)->i_alloc_type; \
59 (p_new_buffer)->i_size = i_alloc_size; \
60 (p_new_buffer)->p_buffer = (byte_t *)(p_new_buffer) \
61 + sizeof(aout_buffer_t); \
62 if ( (p_previous_buffer) != NULL ) \
64 (p_new_buffer)->start_date = \
65 ((aout_buffer_t *)p_previous_buffer)->start_date;\
66 (p_new_buffer)->end_date = \
67 ((aout_buffer_t *)p_previous_buffer)->end_date; \
70 /* we'll keep that for a while --Meuuh */ \
71 /* else printf("%s:%d\n", __FILE__, __LINE__); */ \
74 #define aout_BufferFree( p_buffer ) \
75 if ( (p_buffer)->i_alloc_type == AOUT_ALLOC_HEAP ) \
80 /*****************************************************************************
81 * aout_fifo_t : audio output buffer FIFO
82 *****************************************************************************/
85 aout_buffer_t * p_first;
86 aout_buffer_t ** pp_last;
87 audio_date_t end_date;
90 /*****************************************************************************
91 * aout_filter_t : audio output filter
92 *****************************************************************************/
93 typedef struct aout_filter_t
97 audio_sample_format_t input;
98 audio_sample_format_t output;
99 aout_alloc_t output_alloc;
102 struct aout_filter_sys_t * p_sys;
103 void (* pf_do_work)( struct aout_instance_t *,
104 struct aout_filter_t *,
105 struct aout_buffer_t *,
106 struct aout_buffer_t * );
107 vlc_bool_t b_in_place;
110 /*****************************************************************************
111 * aout_mixer_t : audio output mixer
112 *****************************************************************************/
113 typedef struct aout_mixer_t
115 audio_sample_format_t mixer;
116 aout_alloc_t output_alloc;
119 struct aout_mixer_sys_t * p_sys;
120 void (* pf_do_work)( struct aout_instance_t *,
121 struct aout_buffer_t * );
123 /* Multiplier used to raise or lower the volume of the sound in
124 * software. Beware, this creates sound distortion and should be avoided
125 * as much as possible. This isn't available for non-float32 mixer. */
129 /*****************************************************************************
130 * aout_input_t : input stream for the audio output
131 *****************************************************************************/
134 /* When this lock is taken, the pipeline cannot be changed by a
138 audio_sample_format_t input;
139 aout_alloc_t input_alloc;
142 aout_filter_t * pp_filters[AOUT_MAX_FILTERS];
147 /* Mixer information */
148 byte_t * p_first_byte_to_mix;
151 /*****************************************************************************
152 * aout_output_t : output stream for the audio output
153 *****************************************************************************/
154 typedef struct aout_output_t
156 audio_sample_format_t output;
159 aout_filter_t * pp_filters[AOUT_MAX_FILTERS];
164 struct module_t * p_module;
165 struct aout_sys_t * p_sys;
166 void (* pf_play)( aout_instance_t * );
167 int (* pf_volume_get )( aout_instance_t *, audio_volume_t * );
168 int (* pf_volume_set )( aout_instance_t *, audio_volume_t );
169 int (* pf_volume_infos )( aout_instance_t *, audio_volume_t *, audio_volume_t * );
172 /* Current volume for the output - it's just a placeholder, the plug-in
173 * may or may not use it. */
174 audio_volume_t i_volume;
177 /*****************************************************************************
178 * aout_instance_t : audio output thread descriptor
179 *****************************************************************************/
180 struct aout_instance_t
184 /* Locks : please note that if you need several of these locks, it is
185 * mandatory (to avoid deadlocks) to take them in the following order :
186 * p_input->lock, mixer_lock, output_fifo_lock, input_fifos_lock.
188 /* When input_fifos_lock is taken, none of the p_input->fifo structures
189 * can be read or modified by a third-party thread. */
190 vlc_mutex_t input_fifos_lock;
191 /* When mixer_lock is taken, all decoder threads willing to mix a
192 * buffer must wait until it is released. The output pipeline cannot
193 * be modified. No input stream can be added or removed. */
194 vlc_mutex_t mixer_lock;
195 /* When output_fifo_lock is taken, the p_aout->output.fifo structure
196 * cannot be read or written by a third-party thread. */
197 vlc_mutex_t output_fifo_lock;
199 /* Input streams & pre-filters */
200 aout_input_t * pp_inputs[AOUT_MAX_INPUTS];
207 aout_output_t output;
210 /*****************************************************************************
212 *****************************************************************************/
213 void aout_InputPlay( aout_instance_t * p_aout, aout_input_t * p_input,
214 aout_buffer_t * p_buffer );
216 int aout_FiltersCreatePipeline( aout_instance_t * p_aout,
217 aout_filter_t ** pp_filters,
219 const audio_sample_format_t * p_input_format,
220 const audio_sample_format_t * p_output_format );
221 void aout_FiltersDestroyPipeline( aout_instance_t * p_aout,
222 aout_filter_t ** pp_filters,
224 void aout_FiltersHintBuffers( aout_instance_t * p_aout,
225 aout_filter_t ** pp_filters,
226 int i_nb_filters, aout_alloc_t * p_first_alloc );
227 void aout_FiltersPlay( aout_instance_t * p_aout,
228 aout_filter_t ** pp_filters,
229 int i_nb_filters, aout_buffer_t ** pp_input_buffer );
231 int aout_MixerNew( aout_instance_t * p_aout );
232 void aout_MixerDelete( aout_instance_t * p_aout );
233 void aout_MixerRun( aout_instance_t * p_aout );
234 int aout_MixerMultiplierSet( aout_instance_t * p_aout, float f_multiplier );
235 int aout_MixerMultiplierGet( aout_instance_t * p_aout, float * pf_multiplier );
237 int aout_OutputNew( aout_instance_t * p_aout,
238 audio_sample_format_t * p_format );
239 void aout_OutputPlay( aout_instance_t * p_aout, aout_buffer_t * p_buffer );
240 void aout_OutputDelete( aout_instance_t * p_aout );
241 VLC_EXPORT( aout_buffer_t *, aout_OutputNextBuffer, ( aout_instance_t *, mtime_t, vlc_bool_t ) );
243 VLC_EXPORT( int, aout_FormatNbChannels, ( audio_sample_format_t * p_format ) );
244 void aout_FormatPrepare( audio_sample_format_t * p_format );
245 void aout_FifoInit( aout_instance_t *, aout_fifo_t *, u32 );
246 mtime_t aout_FifoNextStart( aout_instance_t *, aout_fifo_t * );
247 void aout_FifoPush( aout_instance_t *, aout_fifo_t *, aout_buffer_t * );
248 void aout_FifoSet( aout_instance_t *, aout_fifo_t *, mtime_t );
249 void aout_FifoMoveDates( aout_instance_t *, aout_fifo_t *, mtime_t );
250 VLC_EXPORT( aout_buffer_t *, aout_FifoPop, ( aout_instance_t * p_aout, aout_fifo_t * p_fifo ) );
251 void aout_FifoDestroy( aout_instance_t * p_aout, aout_fifo_t * p_fifo );