1 /*****************************************************************************
2 * dec.c : audio output API towards decoders
3 *****************************************************************************
4 * Copyright (C) 2002-2007 the VideoLAN team
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., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
22 *****************************************************************************/
24 /*****************************************************************************
26 *****************************************************************************/
33 #include <vlc_common.h>
36 #include <vlc_input.h>
38 #include "aout_internal.h"
42 * Creates an audio output
44 aout_input_t *aout_DecNew( audio_output_t *p_aout,
45 audio_sample_format_t *p_format,
46 const audio_replay_gain_t *p_replay_gain,
47 const aout_request_vout_t *p_request_vout )
49 /* Sanitize audio format */
50 if( p_format->i_channels > 32 )
52 msg_Err( p_aout, "too many audio channels (%u)",
53 p_format->i_channels );
56 if( p_format->i_channels <= 0 )
58 msg_Err( p_aout, "no audio channels" );
61 if( p_format->i_channels != aout_FormatNbChannels( p_format ) )
63 msg_Err( p_aout, "incompatible audio channels count with layout mask" );
67 if( p_format->i_rate > 192000 )
69 msg_Err( p_aout, "excessive audio sample frequency (%u)",
73 if( p_format->i_rate < 4000 )
75 msg_Err( p_aout, "too low audio sample frequency (%u)",
80 aout_input_t *p_input = calloc( 1, sizeof(aout_input_t));
84 p_input->b_error = true;
86 aout_FormatPrepare( p_format );
88 memcpy( &p_input->input, p_format,
89 sizeof(audio_sample_format_t) );
91 p_input->replay_gain = *p_replay_gain;
93 /* We can only be called by the decoder, so no need to lock
95 aout_owner_t *owner = aout_owner(p_aout);
97 assert (owner->input == NULL);
99 var_Destroy( p_aout, "audio-device" );
100 var_Destroy( p_aout, "audio-channels" );
102 /* Recreate the output using the new format. */
103 if( aout_OutputNew( p_aout, p_format ) < 0 )
106 assert (owner->volume.mixer == NULL);
107 owner->volume.mixer = aout_MixerNew (p_aout, owner->mixer_format.i_format);
108 if (owner->volume.mixer == NULL)
110 aout_OutputDelete( p_aout );
114 owner->input = p_input;
115 aout_InputNew( p_aout, p_input, p_request_vout );
116 aout_unlock( p_aout );
119 aout_unlock( p_aout );
124 /*****************************************************************************
125 * aout_DecDelete : delete a decoder
126 *****************************************************************************/
127 void aout_DecDelete( audio_output_t * p_aout, aout_input_t * p_input )
129 aout_owner_t *owner = aout_owner (p_aout);
130 struct audio_mixer *mixer;
133 /* Remove the input. */
134 assert (owner->input == p_input); /* buggy decoder? */
136 aout_InputDelete( p_aout, p_input );
138 aout_OutputDelete( p_aout );
139 mixer = owner->volume.mixer;
140 owner->volume.mixer = NULL;
141 var_Destroy( p_aout, "audio-device" );
142 var_Destroy( p_aout, "audio-channels" );
144 aout_unlock( p_aout );
146 aout_MixerDelete (mixer);
155 /*****************************************************************************
156 * aout_DecNewBuffer : ask for a new empty buffer
157 *****************************************************************************/
158 aout_buffer_t * aout_DecNewBuffer( aout_input_t * p_input,
159 size_t i_nb_samples )
161 size_t length = i_nb_samples * p_input->input.i_bytes_per_frame
162 / p_input->input.i_frame_length;
163 block_t *block = block_Alloc( length );
164 if( likely(block != NULL) )
166 block->i_nb_samples = i_nb_samples;
167 block->i_pts = block->i_length = 0;
172 /*****************************************************************************
173 * aout_DecDeleteBuffer : destroy an undecoded buffer
174 *****************************************************************************/
175 void aout_DecDeleteBuffer( audio_output_t * p_aout, aout_input_t * p_input,
176 aout_buffer_t * p_buffer )
178 (void)p_aout; (void)p_input;
179 aout_BufferFree( p_buffer );
182 /*****************************************************************************
183 * aout_DecPlay : filter & mix the decoded buffer
184 *****************************************************************************/
185 int aout_DecPlay( audio_output_t * p_aout, aout_input_t * p_input,
186 aout_buffer_t * p_buffer, int i_input_rate )
188 aout_owner_t *owner = aout_owner (p_aout);
189 assert( i_input_rate >= INPUT_RATE_DEFAULT / AOUT_MAX_INPUT_RATE &&
190 i_input_rate <= INPUT_RATE_DEFAULT * AOUT_MAX_INPUT_RATE );
191 assert( p_buffer->i_pts > 0 );
193 p_buffer->i_length = (mtime_t)p_buffer->i_nb_samples * 1000000
194 / p_input->input.i_rate;
197 if( p_input->b_error )
199 aout_unlock( p_aout );
200 aout_BufferFree( p_buffer );
205 aout_InputCheckAndRestart( p_aout, p_input );
206 p_buffer = aout_InputPlay( p_aout, p_input, p_buffer, i_input_rate );
208 if( p_buffer != NULL )
211 float amp = owner->volume.multiplier * p_input->multiplier;
212 aout_MixerRun (owner->volume.mixer, p_buffer, amp);
215 aout_OutputPlay( p_aout, p_buffer );
218 aout_unlock( p_aout );
222 int aout_DecGetResetLost( audio_output_t *p_aout, aout_input_t *p_input )
227 val = p_input->i_buffer_lost;
228 p_input->i_buffer_lost = 0;
229 aout_unlock( p_aout );
234 void aout_DecChangePause( audio_output_t *p_aout, aout_input_t *p_input, bool b_paused, mtime_t i_date )
236 aout_owner_t *owner = aout_owner (p_aout);
239 assert (owner->input == p_input);
241 /* XXX: Should the input date be offset by the pause duration instead? */
242 date_Set (&p_input->date, VLC_TS_INVALID);
243 aout_OutputPause( p_aout, b_paused, i_date );
244 aout_unlock( p_aout );
247 void aout_DecFlush( audio_output_t *p_aout, aout_input_t *p_input )
250 date_Set (&p_input->date, VLC_TS_INVALID);
251 aout_OutputFlush( p_aout, false );
252 aout_unlock( p_aout );
255 bool aout_DecIsEmpty( audio_output_t * p_aout, aout_input_t * p_input )
260 /* FIXME: tell output to drain */
261 end_date = date_Get (&p_input->date);
262 aout_unlock( p_aout );
263 return end_date == VLC_TS_INVALID || end_date <= mdate();