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 *****************************************************************************/
32 #include <vlc_common.h>
34 #include <vlc_codec.h>
35 #include <vlc_input.h>
38 #ifdef HAVE_LIBAVCODEC_AVCODEC_H
39 # include <libavcodec/avcodec.h>
40 #elif defined(HAVE_FFMPEG_AVCODEC_H)
41 # include <ffmpeg/avcodec.h>
48 static unsigned int pi_channels_maps[7] =
51 AOUT_CHAN_CENTER, AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT,
52 AOUT_CHAN_CENTER | AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT,
53 AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_REARLEFT
54 | AOUT_CHAN_REARRIGHT,
55 AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
56 | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT,
57 AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
58 | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT | AOUT_CHAN_LFE
61 /*****************************************************************************
62 * decoder_sys_t : decoder descriptor
63 *****************************************************************************/
68 /* Temporary buffer for libavcodec */
74 audio_sample_format_t aout_format;
75 audio_date_t end_date;
89 /*****************************************************************************
90 * InitAudioDec: initialize audio decoder
91 *****************************************************************************
92 * The ffmpeg codec will be opened, some memory allocated.
93 *****************************************************************************/
94 int InitAudioDec( decoder_t *p_dec, AVCodecContext *p_context,
95 AVCodec *p_codec, int i_codec_id, const char *psz_namecodec )
99 /* Allocate the memory needed to store the decoder's structure */
100 if( ( p_dec->p_sys = p_sys =
101 (decoder_sys_t *)malloc(sizeof(decoder_sys_t)) ) == NULL )
106 p_sys->p_context = p_context;
107 p_sys->p_codec = p_codec;
108 p_sys->i_codec_id = i_codec_id;
109 p_sys->psz_namecodec = psz_namecodec;
111 /* ***** Fill p_context with init values ***** */
112 p_sys->p_context->sample_rate = p_dec->fmt_in.audio.i_rate;
113 p_sys->p_context->channels = p_dec->fmt_in.audio.i_channels;
114 if( !p_dec->fmt_in.audio.i_physical_channels )
116 msg_Warn( p_dec, "Physical channel configuration not set : guessing" );
117 p_dec->fmt_in.audio.i_original_channels =
118 p_dec->fmt_in.audio.i_physical_channels =
119 pi_channels_maps[p_sys->p_context->channels];
122 p_dec->fmt_out.audio.i_physical_channels =
123 p_dec->fmt_out.audio.i_original_channels =
124 p_dec->fmt_in.audio.i_physical_channels;
126 p_sys->p_context->block_align = p_dec->fmt_in.audio.i_blockalign;
127 p_sys->p_context->bit_rate = p_dec->fmt_in.i_bitrate;
128 p_sys->p_context->bits_per_sample = p_dec->fmt_in.audio.i_bitspersample;
130 if( ( p_sys->p_context->extradata_size = p_dec->fmt_in.i_extra ) > 0 )
134 if( p_dec->fmt_in.i_codec == VLC_FOURCC( 'f', 'l', 'a', 'c' ) )
137 p_sys->p_context->extradata_size -= i_offset;
138 p_sys->p_context->extradata =
139 malloc( p_sys->p_context->extradata_size +
140 FF_INPUT_BUFFER_PADDING_SIZE );
141 if( p_sys->p_context->extradata )
143 memcpy( p_sys->p_context->extradata,
144 (char*)p_dec->fmt_in.p_extra + i_offset,
145 p_sys->p_context->extradata_size );
146 memset( (char*)p_sys->p_context->extradata +
147 p_sys->p_context->extradata_size, 0,
148 FF_INPUT_BUFFER_PADDING_SIZE );
152 p_sys->p_context->extradata = NULL;
154 /* ***** Open the codec ***** */
155 vlc_mutex_t *lock = var_AcquireMutex( "avcodec" );
158 free( p_sys->p_context->extradata );
163 if (avcodec_open( p_sys->p_context, p_sys->p_codec ) < 0)
165 vlc_mutex_unlock( lock );
166 msg_Err( p_dec, "cannot open codec (%s)", p_sys->psz_namecodec );
167 free( p_sys->p_context->extradata );
171 vlc_mutex_unlock( lock );
173 msg_Dbg( p_dec, "ffmpeg codec (%s) started", p_sys->psz_namecodec );
175 p_sys->p_output = malloc( AVCODEC_MAX_AUDIO_FRAME_SIZE );
176 p_sys->p_samples = NULL;
177 p_sys->i_samples = 0;
178 p_sys->i_reject_count = 0;
179 p_sys->i_input_rate = INPUT_RATE_DEFAULT;
181 aout_DateSet( &p_sys->end_date, 0 );
182 if( p_dec->fmt_in.audio.i_rate )
183 aout_DateInit( &p_sys->end_date, p_dec->fmt_in.audio.i_rate );
185 /* Set output properties */
186 p_dec->fmt_out.i_cat = AUDIO_ES;
187 p_dec->fmt_out.i_codec = AOUT_FMT_S16_NE;
188 p_dec->fmt_out.audio.i_bitspersample = 16;
193 /*****************************************************************************
194 * SplitBuffer: Needed because aout really doesn't like big audio chunk and
195 * wma produces easily > 30000 samples...
196 *****************************************************************************/
197 static aout_buffer_t *SplitBuffer( decoder_t *p_dec )
199 decoder_sys_t *p_sys = p_dec->p_sys;
200 int i_samples = __MIN( p_sys->i_samples, 4096 );
201 aout_buffer_t *p_buffer;
203 if( i_samples == 0 ) return NULL;
205 if( ( p_buffer = p_dec->pf_aout_buffer_new( p_dec, i_samples ) ) == NULL )
207 msg_Err( p_dec, "cannot get aout buffer" );
211 p_buffer->start_date = aout_DateGet( &p_sys->end_date );
212 p_buffer->end_date = aout_DateIncrement( &p_sys->end_date,
213 i_samples * p_sys->i_input_rate / INPUT_RATE_DEFAULT );
215 memcpy( p_buffer->p_buffer, p_sys->p_samples, p_buffer->i_nb_bytes );
217 p_sys->p_samples += p_buffer->i_nb_bytes;
218 p_sys->i_samples -= i_samples;
223 /*****************************************************************************
224 * DecodeAudio: Called to decode one frame
225 *****************************************************************************/
226 aout_buffer_t * DecodeAudio ( decoder_t *p_dec, block_t **pp_block )
228 decoder_sys_t *p_sys = p_dec->p_sys;
229 int i_used, i_output;
230 aout_buffer_t *p_buffer;
233 if( !pp_block || !*pp_block ) return NULL;
237 if( p_block->i_rate > 0 )
238 p_sys->i_input_rate = p_block->i_rate;
240 if( p_block->i_flags & (BLOCK_FLAG_DISCONTINUITY|BLOCK_FLAG_CORRUPTED) )
242 block_Release( p_block );
243 avcodec_flush_buffers( p_sys->p_context );
245 if( p_sys->i_codec_id == CODEC_ID_MP2 || p_sys->i_codec_id == CODEC_ID_MP3 )
246 p_sys->i_reject_count = 3;
250 if( p_sys->i_samples > 0 )
253 p_buffer = SplitBuffer( p_dec );
254 if( !p_buffer ) block_Release( p_block );
258 if( !aout_DateGet( &p_sys->end_date ) && !p_block->i_pts )
260 /* We've just started the stream, wait for the first PTS. */
261 block_Release( p_block );
265 if( p_block->i_buffer <= 0 )
267 block_Release( p_block );
270 if( p_block->i_buffer > AVCODEC_MAX_AUDIO_FRAME_SIZE )
272 /* Grow output buffer if necessary (eg. for PCM data) */
273 p_sys->p_output = realloc(p_sys->p_output, p_block->i_buffer);
276 *pp_block = p_block = block_Realloc( p_block, 0, p_block->i_buffer + FF_INPUT_BUFFER_PADDING_SIZE );
279 p_block->i_buffer -= FF_INPUT_BUFFER_PADDING_SIZE;
280 memset( &p_block->p_buffer[p_block->i_buffer], 0, FF_INPUT_BUFFER_PADDING_SIZE );
282 #if LIBAVCODEC_VERSION_INT >= ((52<<16)+(0<<8)+0)
283 i_output = __MAX( AVCODEC_MAX_AUDIO_FRAME_SIZE, p_block->i_buffer );
284 i_used = avcodec_decode_audio2( p_sys->p_context,
285 (int16_t*)p_sys->p_output, &i_output,
286 p_block->p_buffer, p_block->i_buffer );
288 i_used = avcodec_decode_audio( p_sys->p_context,
289 (int16_t*)p_sys->p_output, &i_output,
290 p_block->p_buffer, p_block->i_buffer );
293 if( i_used < 0 || i_output < 0 )
296 msg_Warn( p_dec, "cannot decode one frame (%d bytes)",
299 block_Release( p_block );
302 else if( (size_t)i_used > p_block->i_buffer )
304 i_used = p_block->i_buffer;
307 p_block->i_buffer -= i_used;
308 p_block->p_buffer += i_used;
310 if( p_sys->p_context->channels <= 0 || p_sys->p_context->channels > 6 )
312 msg_Warn( p_dec, "invalid channels count %d",
313 p_sys->p_context->channels );
314 block_Release( p_block );
318 if( p_dec->fmt_out.audio.i_rate != (unsigned int)p_sys->p_context->sample_rate )
320 aout_DateInit( &p_sys->end_date, p_sys->p_context->sample_rate );
321 aout_DateSet( &p_sys->end_date, p_block->i_pts );
324 /* **** Set audio output parameters **** */
325 p_dec->fmt_out.audio.i_rate = p_sys->p_context->sample_rate;
326 p_dec->fmt_out.audio.i_channels = p_sys->p_context->channels;
327 p_dec->fmt_out.audio.i_original_channels =
328 p_dec->fmt_out.audio.i_physical_channels =
329 pi_channels_maps[p_sys->p_context->channels];
331 if( p_block->i_pts != 0 &&
332 p_block->i_pts != aout_DateGet( &p_sys->end_date ) )
334 aout_DateSet( &p_sys->end_date, p_block->i_pts );
338 /* **** Now we can output these samples **** */
339 p_sys->i_samples = i_output / sizeof(int16_t) / p_sys->p_context->channels;
340 p_sys->p_samples = p_sys->p_output;
342 /* Silent unwanted samples */
343 if( p_sys->i_reject_count > 0 )
345 memset( p_sys->p_output, 0, i_output );
346 p_sys->i_reject_count--;
349 p_buffer = SplitBuffer( p_dec );
350 if( !p_buffer ) block_Release( p_block );
354 /*****************************************************************************
355 * EndAudioDec: audio decoder destruction
356 *****************************************************************************/
357 void EndAudioDec( decoder_t *p_dec )
359 decoder_sys_t *p_sys = p_dec->p_sys;
361 free( p_sys->p_output );