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"
43 * Creates an audio output
45 aout_input_t *aout_DecNew( audio_output_t *p_aout,
46 audio_sample_format_t *p_format,
47 const audio_replay_gain_t *p_replay_gain,
48 const aout_request_vout_t *p_request_vout )
50 /* Sanitize audio format */
51 if( p_format->i_channels > 32 )
53 msg_Err( p_aout, "too many audio channels (%u)",
54 p_format->i_channels );
57 if( p_format->i_channels <= 0 )
59 msg_Err( p_aout, "no audio channels" );
62 if( p_format->i_channels != aout_FormatNbChannels( p_format ) )
64 msg_Err( p_aout, "incompatible audio channels count with layout mask" );
68 if( p_format->i_rate > 192000 )
70 msg_Err( p_aout, "excessive audio sample frequency (%u)",
74 if( p_format->i_rate < 4000 )
76 msg_Err( p_aout, "too low audio sample frequency (%u)",
81 aout_input_t *p_input = calloc( 1, sizeof(aout_input_t));
85 p_input->b_error = true;
87 aout_FormatPrepare( p_format );
89 memcpy( &p_input->input, p_format,
90 sizeof(audio_sample_format_t) );
92 p_input->replay_gain = *p_replay_gain;
94 /* We can only be called by the decoder, so no need to lock
96 aout_owner_t *owner = aout_owner(p_aout);
98 assert (owner->input == NULL);
100 var_Destroy( p_aout, "audio-device" );
101 var_Destroy( p_aout, "audio-channels" );
103 /* Recreate the output using the new format. */
104 if( aout_OutputNew( p_aout, p_format ) < 0 )
107 assert (owner->volume.mixer == NULL);
108 owner->volume.mixer = aout_MixerNew (p_aout, owner->mixer_format.i_format);
109 if (owner->volume.mixer == NULL)
111 aout_OutputDelete( p_aout );
115 owner->input = p_input;
116 aout_InputNew( p_aout, p_input, p_request_vout );
117 aout_unlock( p_aout );
120 aout_unlock( p_aout );
125 /*****************************************************************************
126 * aout_DecDelete : delete a decoder
127 *****************************************************************************/
128 void aout_DecDelete( audio_output_t * p_aout, aout_input_t * p_input )
130 aout_owner_t *owner = aout_owner (p_aout);
131 struct audio_mixer *mixer;
134 /* Remove the input. */
135 assert (owner->input == p_input); /* buggy decoder? */
137 aout_InputDelete( p_aout, p_input );
139 aout_OutputDelete( p_aout );
140 mixer = owner->volume.mixer;
141 owner->volume.mixer = NULL;
142 var_Destroy( p_aout, "audio-device" );
143 var_Destroy( p_aout, "audio-channels" );
145 aout_unlock( p_aout );
147 aout_MixerDelete (mixer);
151 static void aout_CheckRestart (audio_output_t *aout)
153 aout_owner_t *owner = aout_owner (aout);
154 aout_input_t *input = owner->input;
156 aout_assert_locked (aout);
158 if (likely(!owner->need_restart))
160 owner->need_restart = false;
162 /* Reinitializes the output */
163 aout_InputDelete (aout, owner->input);
164 aout_MixerDelete (owner->volume.mixer);
165 owner->volume.mixer = NULL;
166 aout_OutputDelete (aout);
168 if (aout_OutputNew (aout, &input->input))
171 input->b_error = true;
172 return; /* we are officially screwed */
175 owner->volume.mixer = aout_MixerNew (aout, owner->mixer_format.i_format);
176 if (owner->volume.mixer == NULL)
178 aout_OutputDelete (aout);
182 if (aout_InputNew (aout, input, &input->request_vout))
183 assert (input->b_error);
185 assert (!input->b_error);
193 /*****************************************************************************
194 * aout_DecNewBuffer : ask for a new empty buffer
195 *****************************************************************************/
196 aout_buffer_t * aout_DecNewBuffer( aout_input_t * p_input,
197 size_t i_nb_samples )
199 size_t length = i_nb_samples * p_input->input.i_bytes_per_frame
200 / p_input->input.i_frame_length;
201 block_t *block = block_Alloc( length );
202 if( likely(block != NULL) )
204 block->i_nb_samples = i_nb_samples;
205 block->i_pts = block->i_length = 0;
210 /*****************************************************************************
211 * aout_DecDeleteBuffer : destroy an undecoded buffer
212 *****************************************************************************/
213 void aout_DecDeleteBuffer( audio_output_t * p_aout, aout_input_t * p_input,
214 aout_buffer_t * p_buffer )
216 (void)p_aout; (void)p_input;
217 aout_BufferFree( p_buffer );
220 /*****************************************************************************
221 * aout_DecPlay : filter & mix the decoded buffer
222 *****************************************************************************/
223 int aout_DecPlay( audio_output_t * p_aout, aout_input_t * p_input,
224 aout_buffer_t * p_buffer, int i_input_rate )
226 aout_owner_t *owner = aout_owner (p_aout);
227 assert( i_input_rate >= INPUT_RATE_DEFAULT / AOUT_MAX_INPUT_RATE &&
228 i_input_rate <= INPUT_RATE_DEFAULT * AOUT_MAX_INPUT_RATE );
229 assert( p_buffer->i_pts > 0 );
231 p_buffer->i_length = (mtime_t)p_buffer->i_nb_samples * 1000000
232 / p_input->input.i_rate;
235 if( p_input->b_error )
237 aout_unlock( p_aout );
238 aout_BufferFree( p_buffer );
242 aout_CheckRestart( p_aout );
243 aout_InputCheckAndRestart( p_aout, p_input );
246 p_buffer = aout_InputPlay( p_aout, p_input, p_buffer, i_input_rate );
248 if( p_buffer != NULL )
251 float amp = owner->volume.multiplier * p_input->multiplier;
252 aout_MixerRun (owner->volume.mixer, p_buffer, amp);
255 aout_OutputPlay( p_aout, p_buffer );
258 aout_unlock( p_aout );
262 int aout_DecGetResetLost( audio_output_t *p_aout, aout_input_t *p_input )
267 val = p_input->i_buffer_lost;
268 p_input->i_buffer_lost = 0;
269 aout_unlock( p_aout );
274 void aout_DecChangePause( audio_output_t *p_aout, aout_input_t *p_input, bool b_paused, mtime_t i_date )
276 aout_owner_t *owner = aout_owner (p_aout);
279 assert (owner->input == p_input);
281 /* XXX: Should the input date be offset by the pause duration instead? */
282 date_Set (&p_input->date, VLC_TS_INVALID);
283 aout_OutputPause( p_aout, b_paused, i_date );
284 aout_unlock( p_aout );
287 void aout_DecFlush( audio_output_t *p_aout, aout_input_t *p_input )
290 date_Set (&p_input->date, VLC_TS_INVALID);
291 aout_OutputFlush( p_aout, false );
292 aout_unlock( p_aout );
295 bool aout_DecIsEmpty( audio_output_t * p_aout, aout_input_t * p_input )
300 /* FIXME: tell output to drain */
301 end_date = date_Get (&p_input->date);
302 aout_unlock( p_aout );
303 return end_date == VLC_TS_INVALID || end_date <= mdate();