1 /*****************************************************************************
2 * audio.c: audio decoder using ffmpeg library
3 *****************************************************************************
4 * Copyright (C) 1999-2003 the VideoLAN team
7 * Authors: Laurent Aimar <fenrir@via.ecp.fr>
8 * Gildas Bazin <gbazin@videolan.org>
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., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
23 *****************************************************************************/
25 /*****************************************************************************
27 *****************************************************************************/
30 #include <vlc_codec.h>
33 #ifdef HAVE_FFMPEG_AVCODEC_H
34 # include <ffmpeg/avcodec.h>
41 static unsigned int pi_channels_maps[7] =
44 AOUT_CHAN_CENTER, AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT,
45 AOUT_CHAN_CENTER | AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT,
46 AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_REARLEFT
47 | AOUT_CHAN_REARRIGHT,
48 AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
49 | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT,
50 AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
51 | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT | AOUT_CHAN_LFE
54 /*****************************************************************************
55 * decoder_sys_t : decoder descriptor
56 *****************************************************************************/
59 /* Common part between video and audio decoder */
62 const char *psz_namecodec;
63 AVCodecContext *p_context;
66 /* Temporary buffer for libavcodec */
72 audio_sample_format_t aout_format;
73 audio_date_t end_date;
82 /*****************************************************************************
83 * InitAudioDec: initialize audio decoder
84 *****************************************************************************
85 * The ffmpeg codec will be opened, some memory allocated.
86 *****************************************************************************/
87 int E_(InitAudioDec)( decoder_t *p_dec, AVCodecContext *p_context,
88 AVCodec *p_codec, int i_codec_id, const char *psz_namecodec )
93 var_Get( p_dec->p_libvlc_global, "avcodec", &lockval );
95 /* Allocate the memory needed to store the decoder's structure */
96 if( ( p_dec->p_sys = p_sys =
97 (decoder_sys_t *)malloc(sizeof(decoder_sys_t)) ) == NULL )
99 msg_Err( p_dec, "out of memory" );
103 p_sys->p_context = p_context;
104 p_sys->p_codec = p_codec;
105 p_sys->i_codec_id = i_codec_id;
106 p_sys->psz_namecodec = psz_namecodec;
108 /* ***** Fill p_context with init values ***** */
109 p_sys->p_context->sample_rate = p_dec->fmt_in.audio.i_rate;
110 p_sys->p_context->channels = p_dec->fmt_in.audio.i_channels;
111 p_sys->p_context->block_align = p_dec->fmt_in.audio.i_blockalign;
112 p_sys->p_context->bit_rate = p_dec->fmt_in.i_bitrate;
113 p_sys->p_context->bits_per_sample = p_dec->fmt_in.audio.i_bitspersample;
115 if( ( p_sys->p_context->extradata_size = p_dec->fmt_in.i_extra ) > 0 )
119 if( p_dec->fmt_in.i_codec == VLC_FOURCC( 'f', 'l', 'a', 'c' ) )
122 p_sys->p_context->extradata_size -= i_offset;
123 p_sys->p_context->extradata =
124 malloc( p_sys->p_context->extradata_size +
125 FF_INPUT_BUFFER_PADDING_SIZE );
126 memcpy( p_sys->p_context->extradata,
127 (char*)p_dec->fmt_in.p_extra + i_offset,
128 p_sys->p_context->extradata_size );
129 memset( (char*)p_sys->p_context->extradata +
130 p_sys->p_context->extradata_size, 0,
131 FF_INPUT_BUFFER_PADDING_SIZE );
134 /* ***** Open the codec ***** */
135 vlc_mutex_lock( lockval.p_address );
136 if (avcodec_open( p_sys->p_context, p_sys->p_codec ) < 0)
138 vlc_mutex_unlock( lockval.p_address );
139 msg_Err( p_dec, "cannot open codec (%s)", p_sys->psz_namecodec );
143 vlc_mutex_unlock( lockval.p_address );
145 msg_Dbg( p_dec, "ffmpeg codec (%s) started", p_sys->psz_namecodec );
147 p_sys->p_output = malloc( AVCODEC_MAX_AUDIO_FRAME_SIZE );
148 p_sys->p_samples = NULL;
149 p_sys->i_samples = 0;
151 if( p_dec->fmt_in.audio.i_rate )
153 aout_DateInit( &p_sys->end_date, p_dec->fmt_in.audio.i_rate );
154 aout_DateSet( &p_sys->end_date, 0 );
157 /* Set output properties */
158 p_dec->fmt_out.i_cat = AUDIO_ES;
159 p_dec->fmt_out.i_codec = AOUT_FMT_S16_NE;
160 p_dec->fmt_out.audio.i_bitspersample = 16;
165 /*****************************************************************************
166 * SplitBuffer: Needed because aout really doesn't like big audio chunk and
167 * wma produces easily > 30000 samples...
168 *****************************************************************************/
169 static aout_buffer_t *SplitBuffer( decoder_t *p_dec )
171 decoder_sys_t *p_sys = p_dec->p_sys;
172 int i_samples = __MIN( p_sys->i_samples, 4096 );
173 aout_buffer_t *p_buffer;
175 if( i_samples == 0 ) return NULL;
177 if( ( p_buffer = p_dec->pf_aout_buffer_new( p_dec, i_samples ) ) == NULL )
179 msg_Err( p_dec, "cannot get aout buffer" );
183 p_buffer->start_date = aout_DateGet( &p_sys->end_date );
184 p_buffer->end_date = aout_DateIncrement( &p_sys->end_date, i_samples );
186 memcpy( p_buffer->p_buffer, p_sys->p_samples, p_buffer->i_nb_bytes );
188 p_sys->p_samples += p_buffer->i_nb_bytes;
189 p_sys->i_samples -= i_samples;
194 /*****************************************************************************
195 * DecodeAudio: Called to decode one frame
196 *****************************************************************************/
197 aout_buffer_t *E_( DecodeAudio )( decoder_t *p_dec, block_t **pp_block )
199 decoder_sys_t *p_sys = p_dec->p_sys;
200 int i_used, i_output;
201 aout_buffer_t *p_buffer;
204 if( !pp_block || !*pp_block ) return NULL;
208 if( p_block->i_buffer <= 0 && p_sys->i_samples > 0 )
211 p_buffer = SplitBuffer( p_dec );
212 if( !p_buffer ) block_Release( p_block );
216 if( !aout_DateGet( &p_sys->end_date ) && !p_block->i_pts )
218 /* We've just started the stream, wait for the first PTS. */
219 block_Release( p_block );
223 if( p_block->i_buffer <= 0 ||
224 (p_block->i_flags & (BLOCK_FLAG_DISCONTINUITY|BLOCK_FLAG_CORRUPTED)) )
226 block_Release( p_block );
230 if( p_block->i_buffer > AVCODEC_MAX_AUDIO_FRAME_SIZE )
232 /* Grow output buffer if necessary (eg. for PCM data) */
233 p_sys->p_output = realloc(p_sys->p_output, p_block->i_buffer);
236 i_used = avcodec_decode_audio( p_sys->p_context,
237 (int16_t*)p_sys->p_output, &i_output,
238 p_block->p_buffer, p_block->i_buffer );
240 if( i_used < 0 || i_output < 0 )
243 msg_Warn( p_dec, "cannot decode one frame (%d bytes)",
246 block_Release( p_block );
249 else if( i_used > p_block->i_buffer )
251 i_used = p_block->i_buffer;
254 p_block->i_buffer -= i_used;
255 p_block->p_buffer += i_used;
257 if( p_sys->p_context->channels <= 0 || p_sys->p_context->channels > 6 )
259 msg_Warn( p_dec, "invalid channels count %d",
260 p_sys->p_context->channels );
261 block_Release( p_block );
265 if( p_dec->fmt_out.audio.i_rate != (unsigned int)p_sys->p_context->sample_rate )
267 aout_DateInit( &p_sys->end_date, p_sys->p_context->sample_rate );
268 aout_DateSet( &p_sys->end_date, p_block->i_pts );
271 /* **** Set audio output parameters **** */
272 p_dec->fmt_out.audio.i_rate = p_sys->p_context->sample_rate;
273 p_dec->fmt_out.audio.i_channels = p_sys->p_context->channels;
274 p_dec->fmt_out.audio.i_original_channels =
275 p_dec->fmt_out.audio.i_physical_channels =
276 pi_channels_maps[p_sys->p_context->channels];
278 if( p_block->i_pts != 0 &&
279 p_block->i_pts != aout_DateGet( &p_sys->end_date ) )
281 aout_DateSet( &p_sys->end_date, p_block->i_pts );
285 /* **** Now we can output these samples **** */
286 p_sys->i_samples = i_output / 2 / p_sys->p_context->channels;
287 p_sys->p_samples = p_sys->p_output;
289 p_buffer = SplitBuffer( p_dec );
290 if( !p_buffer ) block_Release( p_block );
294 /*****************************************************************************
295 * EndAudioDec: audio decoder destruction
296 *****************************************************************************/
297 void E_(EndAudioDec)( decoder_t *p_dec )
299 decoder_sys_t *p_sys = p_dec->p_sys;
301 if( p_sys->p_output ) free( p_sys->p_output );