output.c 8.74 KB
Newer Older
1 2 3 4
/*****************************************************************************
 * output.c : internal management of output streams for the audio output
 *****************************************************************************
 * Copyright (C) 2002 VideoLAN
5
 * $Id: output.c,v 1.7 2002/08/19 21:31:11 massiot Exp $
6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62
 *
 * 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.
 * 
 * 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
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
 *****************************************************************************/

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

#include <vlc/vlc.h>

#include "audio_output.h"
#include "aout_internal.h"

/*****************************************************************************
 * aout_OutputNew : allocate a new output and rework the filter pipeline
 *****************************************************************************/
int aout_OutputNew( aout_instance_t * p_aout,
                    audio_sample_format_t * p_format )
{
    char * psz_name = config_GetPsz( p_aout, "aout" );
    int i_rate = config_GetInt( p_aout, "aout-rate" );
    int i_channels = config_GetInt( p_aout, "aout-channels" );

    /* Prepare FIFO. */
    vlc_mutex_init( p_aout, &p_aout->output.fifo.lock );
    p_aout->output.fifo.p_first = NULL;
    p_aout->output.fifo.pp_last = &p_aout->output.fifo.p_first;

    p_aout->output.p_module = module_Need( p_aout, "audio output",
                                           psz_name );
    if ( psz_name != NULL ) free( psz_name );
    if ( p_aout->output.p_module == NULL )
    {
        msg_Err( p_aout, "no suitable aout module" );
        return -1;
    }

    /* Retrieve user defaults. */
    memcpy( &p_aout->output.output, p_format, sizeof(audio_sample_format_t) );
    if ( i_rate != -1 ) p_aout->output.output.i_rate = i_rate;
    if ( i_channels != -1 ) p_aout->output.output.i_channels = i_channels;
63
    if ( AOUT_FMT_NON_LINEAR(&p_aout->output.output) )
64 65 66 67
    {
        p_aout->output.output.i_format = AOUT_FMT_SPDIF;
    }
    else
68 69 70 71 72 73 74 75 76 77 78 79 80 81
    {
        /* Non-S/PDIF mixer only deals with float32 or fixed32. */
        p_aout->output.output.i_format
                     = (p_aout->p_vlc->i_cpu & CPU_CAPABILITY_FPU) ?
                        AOUT_FMT_FLOAT32 : AOUT_FMT_FIXED32;
    }

    /* Find the best output format. */
    if ( p_aout->output.pf_setformat( p_aout ) != 0 )
    {
        msg_Err( p_aout, "couldn't set an output format" );
        module_Unneed( p_aout, p_aout->output.p_module );
        return -1;
    }
82
    aout_FormatPrepare( &p_aout->output.output );
83 84 85 86 87 88

    msg_Dbg( p_aout, "output format=%d rate=%d channels=%d",
             p_aout->output.output.i_format, p_aout->output.output.i_rate,
             p_aout->output.output.i_channels );

    /* Calculate the resulting mixer output format. */
89 90
    memcpy( &p_aout->mixer.mixer, &p_aout->output.output,
            sizeof(audio_sample_format_t) );
91
    if ( !AOUT_FMT_NON_LINEAR(&p_aout->output.output) )
92 93
    {
        /* Non-S/PDIF mixer only deals with float32 or fixed32. */
94
        p_aout->mixer.mixer.i_format
95 96
                     = (p_aout->p_vlc->i_cpu & CPU_CAPABILITY_FPU) ?
                        AOUT_FMT_FLOAT32 : AOUT_FMT_FIXED32;
97
        aout_FormatPrepare( &p_aout->mixer.mixer );
98
    }
99 100
    else
    {
101
        p_aout->mixer.mixer.i_format = p_format->i_format;
102 103 104
    }

    msg_Dbg( p_aout, "mixer format=%d rate=%d channels=%d",
105 106
             p_aout->mixer.mixer.i_format, p_aout->mixer.mixer.i_rate,
             p_aout->mixer.mixer.i_channels );
107 108 109 110

    /* Create filters. */
    if ( aout_FiltersCreatePipeline( p_aout, p_aout->output.pp_filters,
                                     &p_aout->output.i_nb_filters,
111
                                     &p_aout->mixer.mixer,
112 113 114 115 116 117 118 119 120 121
                                     &p_aout->output.output ) < 0 )
    {
        msg_Err( p_aout, "couldn't set an output pipeline" );
        module_Unneed( p_aout, p_aout->output.p_module );
        return -1;
    }

    /* Prepare hints for the buffer allocator. */
    p_aout->mixer.output_alloc.i_alloc_type = AOUT_ALLOC_HEAP;
    p_aout->mixer.output_alloc.i_bytes_per_sec
122 123 124
                        = p_aout->mixer.mixer.i_bytes_per_frame
                           * p_aout->mixer.mixer.i_rate
                           / p_aout->mixer.mixer.i_frame_length;
125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153

    aout_FiltersHintBuffers( p_aout, p_aout->output.pp_filters,
                             p_aout->output.i_nb_filters,
                             &p_aout->mixer.output_alloc );

    return 0;
}

/*****************************************************************************
 * aout_OutputDelete : delete the output
 *****************************************************************************/
void aout_OutputDelete( aout_instance_t * p_aout )
{
    module_Unneed( p_aout, p_aout->output.p_module );

    aout_FiltersDestroyPipeline( p_aout, p_aout->output.pp_filters,
                                 p_aout->output.i_nb_filters );
    aout_FifoDestroy( p_aout, &p_aout->output.fifo );
}

/*****************************************************************************
 * aout_OutputPlay : play a buffer
 *****************************************************************************/
void aout_OutputPlay( aout_instance_t * p_aout, aout_buffer_t * p_buffer )
{
    aout_FiltersPlay( p_aout, p_aout->output.pp_filters,
                      p_aout->output.i_nb_filters,
                      &p_buffer );

154 155 156
    aout_FifoPush( p_aout, &p_aout->output.fifo, p_buffer );

    p_aout->output.pf_play( p_aout );
157 158 159 160
}

/*****************************************************************************
 * aout_OutputNextBuffer : give the audio output plug-in the right buffer
161 162 163 164
 *****************************************************************************
 * If b_can_sleek is 1, the aout core functions won't try to resample
 * new buffers to catch up - that is we suppose that the output plug-in can
 * do it by itself. S/PDIF outputs should always set b_can_sleek = 1.
165 166
 *****************************************************************************/
aout_buffer_t * aout_OutputNextBuffer( aout_instance_t * p_aout,
167 168
                                       mtime_t start_date ,
                                       vlc_bool_t b_can_sleek )
169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190
{
    aout_buffer_t * p_buffer;

    vlc_mutex_lock( &p_aout->output.fifo.lock );
    p_buffer = p_aout->output.fifo.p_first;

    while ( p_buffer != NULL && p_buffer->end_date < start_date )
    {
        msg_Dbg( p_aout, "audio output is too slow (%lld)",
                 start_date - p_buffer->end_date );
        p_buffer = p_buffer->p_next;
    }

    p_aout->output.fifo.p_first = p_buffer;
    if ( p_buffer == NULL )
    {
        p_aout->output.fifo.pp_last = &p_aout->output.fifo.p_first;
        vlc_mutex_unlock( &p_aout->output.fifo.lock );
        msg_Dbg( p_aout, "audio output is starving" );
        return NULL;
    }

191 192
    /* Here we suppose that all buffers have the same duration - this is
     * generally true, and anyway if it's wrong it won't be a disaster. */
193
    if ( p_buffer->start_date > start_date
194
                         + (p_buffer->end_date - p_buffer->start_date) )
195 196 197 198 199 200 201
    {
        vlc_mutex_unlock( &p_aout->output.fifo.lock );
        msg_Dbg( p_aout, "audio output is starving (%lld)",
                 p_buffer->start_date - start_date );
        return NULL;
    }

202 203 204 205 206 207 208 209
#if 0
    if ( !b_can_sleek )
    {
        /* Try to compensate the drift by doing some resampling. */
        int i;

        /* Take the mixer lock because no input can be removed when the
         * the mixer lock is taken. */
210
        vlc_mutex_lock( &p_aout->output.fifo.lock );
211 212 213 214
        for ( i = 0; i < p_input->i_nb_inputs; i++ )
        {
            aout_input_t * p_input = p_aout->pp_inputs[i];
        }
215
        vlc_mutex_lock( &p_aout->output.fifo.lock );
216 217
    }
#endif
218 219 220 221 222 223 224 225 226 227

    p_aout->output.fifo.p_first = p_buffer->p_next;
    if ( p_buffer->p_next == NULL )
    {
        p_aout->output.fifo.pp_last = &p_aout->output.fifo.p_first;
    }

    vlc_mutex_unlock( &p_aout->output.fifo.lock );
    return p_buffer;
}