1 /*****************************************************************************
2 * audio.c: audio decoder using ffmpeg library
3 *****************************************************************************
4 * Copyright (C) 1999-2003 VideoLAN
5 * $Id: audio.c,v 1.22 2003/11/16 21:07:30 gbazin Exp $
7 * Authors: Laurent Aimar <fenrir@via.ecp.fr>
8 * Gildas Bazin <gbazin@netcourrier.com>
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
23 *****************************************************************************/
25 /*****************************************************************************
27 *****************************************************************************/
28 #include <stdlib.h> /* malloc(), free() */
32 #include <vlc/decoder.h>
33 #include <vlc/input.h>
36 #include "aout_internal.h"
39 #ifdef HAVE_FFMPEG_AVCODEC_H
40 # include <ffmpeg/avcodec.h>
47 static unsigned int pi_channels_maps[6] =
50 AOUT_CHAN_CENTER, AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT,
51 AOUT_CHAN_CENTER | AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT,
52 AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_REARLEFT
53 | AOUT_CHAN_REARRIGHT,
54 AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
55 | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT
58 /*****************************************************************************
59 * decoder_sys_t : decoder descriptor
60 *****************************************************************************/
63 /* Common part between video and audio decoder */
67 AVCodecContext *p_context;
70 /* Temporary buffer for libavcodec */
76 audio_sample_format_t aout_format;
77 audio_date_t end_date;
80 /*****************************************************************************
81 * InitAudioDec: initialize audio decoder
82 *****************************************************************************
83 * The ffmpeg codec will be opened, some memory allocated.
84 *****************************************************************************/
85 int E_(InitAudioDec)( decoder_t *p_dec, AVCodecContext *p_context,
86 AVCodec *p_codec, int i_codec_id, char *psz_namecodec )
90 /* Allocate the memory needed to store the decoder's structure */
91 if( ( p_dec->p_sys = p_sys =
92 (decoder_sys_t *)malloc(sizeof(decoder_sys_t)) ) == NULL )
94 msg_Err( p_dec, "out of memory" );
98 p_dec->p_sys->p_context = p_context;
99 p_dec->p_sys->p_codec = p_codec;
100 p_dec->p_sys->i_codec_id = i_codec_id;
101 p_dec->p_sys->psz_namecodec = psz_namecodec;
103 /* ***** Fill p_context with init values ***** */
104 p_sys->p_context->sample_rate = p_dec->fmt_in.audio.i_rate;
105 p_sys->p_context->channels = p_dec->fmt_in.audio.i_channels;
106 p_sys->p_context->block_align = p_dec->fmt_in.audio.i_blockalign;
107 p_sys->p_context->bit_rate = p_dec->fmt_in.i_bitrate;
109 if( ( p_sys->p_context->extradata_size = p_dec->fmt_in.i_extra ) > 0 )
111 p_sys->p_context->extradata =
112 malloc( p_dec->fmt_in.i_extra + FF_INPUT_BUFFER_PADDING_SIZE );
113 memcpy( p_sys->p_context->extradata,
114 p_dec->fmt_in.p_extra, p_dec->fmt_in.i_extra );
115 memset( p_sys->p_context->extradata + p_dec->fmt_in.i_extra, 0,
116 FF_INPUT_BUFFER_PADDING_SIZE );
119 /* ***** Open the codec ***** */
120 if (avcodec_open( p_sys->p_context, p_sys->p_codec ) < 0)
122 msg_Err( p_dec, "cannot open codec (%s)", p_sys->psz_namecodec );
127 msg_Dbg( p_dec, "ffmpeg codec (%s) started", p_sys->psz_namecodec );
130 p_sys->p_output = malloc( 3 * AVCODEC_MAX_AUDIO_FRAME_SIZE );
132 aout_DateSet( &p_sys->end_date, 0 );
134 /* Set output properties */
135 p_dec->fmt_out.i_cat = AUDIO_ES;
136 p_dec->fmt_out.i_codec = AOUT_FMT_S16_NE;
141 /*****************************************************************************
142 * DecodeAudio: Called to decode one frame
143 *****************************************************************************/
144 aout_buffer_t *E_( DecodeAudio )( decoder_t *p_dec, block_t **pp_block )
146 decoder_sys_t *p_sys = p_dec->p_sys;
147 int i_used, i_output, i_samples;
149 aout_buffer_t *p_buffer;
152 if( !pp_block || !*pp_block ) return NULL;
156 if( !aout_DateGet( &p_sys->end_date ) && !p_block->i_pts )
158 /* We've just started the stream, wait for the first PTS. */
159 block_Release( p_block );
163 if( !p_block->i_buffer )
165 block_Release( p_block );
169 i_used = avcodec_decode_audio( p_sys->p_context,
170 (int16_t*)p_sys->p_output, &i_output,
171 p_block->p_buffer, p_block->i_buffer );
173 if( i_used < 0 )//|| i_output == 0 )
176 msg_Warn( p_dec, "cannot decode one frame (%d bytes)",
179 block_Release( p_block );
183 p_block->i_buffer -= i_used;
184 p_block->p_buffer += i_used;
186 if( p_sys->p_context->channels <= 0 || p_sys->p_context->channels > 6 )
188 msg_Warn( p_dec, "invalid channels count %d",
189 p_sys->p_context->channels );
190 block_Release( p_block );
194 if( p_dec->fmt_out.audio.i_rate != p_sys->p_context->sample_rate )
196 aout_DateInit( &p_sys->end_date, p_sys->p_context->sample_rate );
197 aout_DateSet( &p_sys->end_date, p_block->i_pts );
200 /* **** Set audio output parameters **** */
201 p_dec->fmt_out.audio.i_rate = p_sys->p_context->sample_rate;
202 p_dec->fmt_out.audio.i_channels = p_sys->p_context->channels;
203 p_dec->fmt_out.audio.i_original_channels =
204 p_dec->fmt_out.audio.i_physical_channels =
205 pi_channels_maps[p_sys->p_context->channels];
207 if( p_block->i_pts != 0 &&
208 p_block->i_pts != aout_DateGet( &p_sys->end_date ) )
210 aout_DateSet( &p_sys->end_date, p_block->i_pts );
214 /* **** Now we can output these samples **** */
215 i_samples = i_output / 2 / p_sys->p_context->channels;
216 p_samples = p_sys->p_output;
218 p_buffer = p_dec->pf_aout_buffer_new( p_dec, i_samples );
221 msg_Err( p_dec, "cannot get aout buffer" );
222 block_Release( p_block );
226 p_buffer->start_date = aout_DateGet( &p_sys->end_date );
227 p_buffer->end_date = aout_DateIncrement( &p_sys->end_date, i_samples );
229 memcpy( p_buffer->p_buffer, p_samples, p_buffer->i_nb_bytes );
234 /*****************************************************************************
235 * EndAudioDec: audio decoder destruction
236 *****************************************************************************/
237 void E_(EndAudioDec)( decoder_t *p_dec )
239 decoder_sys_t *p_sys = p_dec->p_sys;
241 if( p_sys->p_output ) free( p_sys->p_output );