git.sesse.net Git - vlc/blob - include/aout_internal.h

   1 /*****************************************************************************
   2  * aout_internal.h : internal defines for audio output
   3  *****************************************************************************
   4  * Copyright (C) 2002 VideoLAN
   5  * $Id: aout_internal.h,v 1.19 2002/09/19 21:56:39 massiot Exp $
   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., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
  22  *****************************************************************************/
  23
  24 /*****************************************************************************
  25  * aout_alloc_t : allocation of memory in the audio output
  26  *****************************************************************************/
  27 typedef struct aout_alloc_t
  28 {
  29     int                     i_alloc_type;
  30     int                     i_bytes_per_sec;
  31 } aout_alloc_t;
  32
  33 #define AOUT_ALLOC_NONE     0
  34 #define AOUT_ALLOC_STACK    1
  35 #define AOUT_ALLOC_HEAP     2
  36
  37 #define aout_BufferAlloc( p_alloc, i_nb_usec, p_previous_buffer,            \
  38                           p_new_buffer )                                    \
  39     if ( (p_alloc)->i_alloc_type == AOUT_ALLOC_NONE )                       \
  40     {                                                                       \
  41         (p_new_buffer) = p_previous_buffer;                                 \
  42     }                                                                       \
  43     else                                                                    \
  44     {                                                                       \
  45         int i_alloc_size;                                                   \
  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 )                  \
  49         {                                                                   \
  50             (p_new_buffer) = alloca( i_alloc_size + sizeof(aout_buffer_t) );\
  51         }                                                                   \
  52         else                                                                \
  53         {                                                                   \
  54             (p_new_buffer) = malloc( i_alloc_size + sizeof(aout_buffer_t) );\
  55         }                                                                   \
  56         if ( p_new_buffer != NULL )                                         \
  57         {                                                                   \
  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 )                              \
  63             {                                                               \
  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;  \
  68             }                                                               \
  69         }                                                                   \
  70         /* we'll keep that for a while --Meuuh */                           \
  71         /* else printf("%s:%d\n", __FILE__, __LINE__); */                   \
  72     }
  73
  74 #define aout_BufferFree( p_buffer )                                         \
  75     if ( (p_buffer)->i_alloc_type == AOUT_ALLOC_HEAP )                      \
  76     {                                                                       \
  77         free( p_buffer );                                                   \
  78     }
  79
  80 /*****************************************************************************
  81  * aout_fifo_t : audio output buffer FIFO
  82  *****************************************************************************/
  83 struct aout_fifo_t
  84 {
  85     aout_buffer_t *         p_first;
  86     aout_buffer_t **        pp_last;
  87     audio_date_t            end_date;
  88 };
  89
  90 /*****************************************************************************
  91  * aout_filter_t : audio output filter
  92  *****************************************************************************/
  93 typedef struct aout_filter_t
  94 {
  95     VLC_COMMON_MEMBERS
  96
  97     audio_sample_format_t   input;
  98     audio_sample_format_t   output;
  99     aout_alloc_t            output_alloc;
 100
 101     module_t *              p_module;
 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;
 108 } aout_filter_t;
 109
 110 /*****************************************************************************
 111  * aout_mixer_t : audio output mixer
 112  *****************************************************************************/
 113 typedef struct aout_mixer_t
 114 {
 115     audio_sample_format_t   mixer;
 116     aout_alloc_t            output_alloc;
 117
 118     module_t *              p_module;
 119     struct aout_mixer_sys_t * p_sys;
 120     void                 (* pf_do_work)( struct aout_instance_t *,
 121                                          struct aout_buffer_t * );
 122
 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. */
 126     float                   f_multiplier;
 127 } aout_mixer_t;
 128
 129 /*****************************************************************************
 130  * aout_input_t : input stream for the audio output
 131  *****************************************************************************/
 132 struct aout_input_t
 133 {
 134     /* When this lock is taken, the pipeline cannot be changed by a
 135      * third-party. */
 136     vlc_mutex_t             lock;
 137
 138     audio_sample_format_t   input;
 139     aout_alloc_t            input_alloc;
 140
 141     /* pre-filters */
 142     aout_filter_t *         pp_filters[AOUT_MAX_FILTERS];
 143     int                     i_nb_filters;
 144
 145     aout_fifo_t             fifo;
 146
 147     /* Mixer information */
 148     byte_t *                p_first_byte_to_mix;
 149 };
 150
 151 /*****************************************************************************
 152  * aout_output_t : output stream for the audio output
 153  *****************************************************************************/
 154 typedef struct aout_output_t
 155 {
 156     audio_sample_format_t   output;
 157
 158     /* post-filters */
 159     aout_filter_t *         pp_filters[AOUT_MAX_FILTERS];
 160     int                     i_nb_filters;
 161
 162     aout_fifo_t             fifo;
 163
 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 * );
 170     int                     i_nb_samples;
 171
 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;
 175 } aout_output_t;
 176
 177 /*****************************************************************************
 178  * aout_instance_t : audio output thread descriptor
 179  *****************************************************************************/
 180 struct aout_instance_t
 181 {
 182     VLC_COMMON_MEMBERS
 183
 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.
 187      * --Meuuh */
 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;
 198
 199     /* Input streams & pre-filters */
 200     aout_input_t *          pp_inputs[AOUT_MAX_INPUTS];
 201     int                     i_nb_inputs;
 202
 203     /* Mixer */
 204     aout_mixer_t            mixer;
 205
 206     /* Output plug-in */
 207     aout_output_t           output;
 208 };
 209
 210 /*****************************************************************************
 211  * Prototypes
 212  *****************************************************************************/
 213 /* From input.c : */
 214 void aout_InputPlay( aout_instance_t * p_aout, aout_input_t * p_input,
 215                      aout_buffer_t * p_buffer );
 216
 217 /* From filters.c : */
 218 int aout_FiltersCreatePipeline( aout_instance_t * p_aout,
 219                                 aout_filter_t ** pp_filters,
 220                                 int * pi_nb_filters,
 221                                 const audio_sample_format_t * p_input_format,
 222                                 const audio_sample_format_t * p_output_format );
 223 void aout_FiltersDestroyPipeline( aout_instance_t * p_aout,
 224                                   aout_filter_t ** pp_filters,
 225                                   int i_nb_filters );
 226 void aout_FiltersHintBuffers( aout_instance_t * p_aout,
 227                               aout_filter_t ** pp_filters,
 228                               int i_nb_filters, aout_alloc_t * p_first_alloc );
 229 void aout_FiltersPlay( aout_instance_t * p_aout,
 230                        aout_filter_t ** pp_filters,
 231                        int i_nb_filters, aout_buffer_t ** pp_input_buffer );
 232
 233 /* From mixer.c : */
 234 int aout_MixerNew( aout_instance_t * p_aout );
 235 void aout_MixerDelete( aout_instance_t * p_aout );
 236 void aout_MixerRun( aout_instance_t * p_aout );
 237 int aout_MixerMultiplierSet( aout_instance_t * p_aout, float f_multiplier );
 238 int aout_MixerMultiplierGet( aout_instance_t * p_aout, float * pf_multiplier );
 239
 240 /* From output.c : */
 241 int aout_OutputNew( aout_instance_t * p_aout,
 242                     audio_sample_format_t * p_format );
 243 void aout_OutputPlay( aout_instance_t * p_aout, aout_buffer_t * p_buffer );
 244 void aout_OutputDelete( aout_instance_t * p_aout );
 245 VLC_EXPORT( aout_buffer_t *, aout_OutputNextBuffer, ( aout_instance_t *, mtime_t, vlc_bool_t ) );
 246
 247 /* From audio_output.c : */
 248 VLC_EXPORT( int, aout_FormatNbChannels, ( audio_sample_format_t * p_format ) );
 249 void aout_FormatPrepare( audio_sample_format_t * p_format );
 250 void aout_FifoInit( aout_instance_t *, aout_fifo_t *, u32 );
 251 mtime_t aout_FifoNextStart( aout_instance_t *, aout_fifo_t * );
 252 void aout_FifoPush( aout_instance_t *, aout_fifo_t *, aout_buffer_t * );
 253 void aout_FifoSet( aout_instance_t *, aout_fifo_t *, mtime_t );
 254 void aout_FifoMoveDates( aout_instance_t *, aout_fifo_t *, mtime_t );
 255 VLC_EXPORT( aout_buffer_t *, aout_FifoPop, ( aout_instance_t * p_aout, aout_fifo_t * p_fifo ) );
 256 void aout_FifoDestroy( aout_instance_t * p_aout, aout_fifo_t * p_fifo );
 257
 258 /* From intf.c :*/
 259 VLC_EXPORT( void, aout_VolumeSoftInit, ( aout_instance_t * ) );
 260 int aout_VolumeSoftGet( aout_instance_t *, audio_volume_t * );
 261 int aout_VolumeSoftSet( aout_instance_t *, audio_volume_t );
 262 int aout_VolumeSoftInfos( aout_instance_t *, audio_volume_t * );
 263 VLC_EXPORT( void, aout_VolumeNoneInit, ( aout_instance_t * ) );
 264 int aout_VolumeNoneGet( aout_instance_t *, audio_volume_t * );
 265 int aout_VolumeNoneSet( aout_instance_t *, audio_volume_t );
 266 int aout_VolumeNoneInfos( aout_instance_t *, audio_volume_t * );
 267