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_avcodec.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 /*****************************************************************************
49 * decoder_sys_t : decoder descriptor
50 *****************************************************************************/
55 /* Temporary buffer for libavcodec */
62 audio_sample_format_t aout_format;
76 int pi_extraction[AOUT_CHAN_MAX];
77 int i_previous_channels;
78 int64_t i_previous_layout;
81 static void SetupOutputFormat( decoder_t *p_dec, bool b_trust );
83 /*****************************************************************************
84 * InitAudioDec: initialize audio decoder
85 *****************************************************************************
86 * The ffmpeg codec will be opened, some memory allocated.
87 *****************************************************************************/
88 int InitAudioDec( decoder_t *p_dec, AVCodecContext *p_context,
89 AVCodec *p_codec, int i_codec_id, const char *psz_namecodec )
93 /* Allocate the memory needed to store the decoder's structure */
94 if( ( p_dec->p_sys = p_sys = malloc(sizeof(*p_sys)) ) == NULL )
99 p_sys->p_context = p_context;
100 p_sys->p_codec = p_codec;
101 p_sys->i_codec_id = i_codec_id;
102 p_sys->psz_namecodec = psz_namecodec;
103 p_sys->b_delayed_open = false;
105 /* ***** Fill p_context with init values ***** */
106 p_sys->p_context->sample_rate = p_dec->fmt_in.audio.i_rate;
107 p_sys->p_context->channels = p_dec->fmt_in.audio.i_channels;
109 p_sys->p_context->block_align = p_dec->fmt_in.audio.i_blockalign;
110 p_sys->p_context->bit_rate = p_dec->fmt_in.i_bitrate;
111 #if LIBAVCODEC_VERSION_INT < ((52<<16)+(0<<8)+0)
112 p_sys->p_context->bits_per_sample = p_dec->fmt_in.audio.i_bitspersample;
114 p_sys->p_context->bits_per_coded_sample = p_dec->fmt_in.audio.i_bitspersample;
117 if( p_dec->fmt_in.i_extra > 0 )
119 const uint8_t * const p_src = p_dec->fmt_in.p_extra;
123 if( p_dec->fmt_in.i_codec == VLC_CODEC_FLAC )
126 i_size = p_dec->fmt_in.i_extra - 8;
128 else if( p_dec->fmt_in.i_codec == VLC_CODEC_ALAC )
130 static const uint8_t p_pattern[] = { 0, 0, 0, 36, 'a', 'l', 'a', 'c' };
131 /* Find alac atom XXX it is a bit ugly */
132 for( i_offset = 0; i_offset < p_dec->fmt_in.i_extra - sizeof(p_pattern); i_offset++ )
134 if( !memcmp( &p_src[i_offset], p_pattern, sizeof(p_pattern) ) )
137 i_size = __MIN( p_dec->fmt_in.i_extra - i_offset, 36 );
144 i_size = p_dec->fmt_in.i_extra;
149 p_sys->p_context->extradata =
150 malloc( i_size + FF_INPUT_BUFFER_PADDING_SIZE );
151 if( p_sys->p_context->extradata )
153 uint8_t *p_dst = p_sys->p_context->extradata;
155 p_sys->p_context->extradata_size = i_size;
157 memcpy( &p_dst[0], &p_src[i_offset], i_size );
158 memset( &p_dst[i_size], 0, FF_INPUT_BUFFER_PADDING_SIZE );
164 p_sys->p_context->extradata_size = 0;
165 p_sys->p_context->extradata = NULL;
168 /* ***** Open the codec ***** */
171 ret = avcodec_open( p_sys->p_context, p_sys->p_codec );
172 vlc_avcodec_unlock();
175 msg_Err( p_dec, "cannot open codec (%s)", p_sys->psz_namecodec );
176 free( p_sys->p_context->extradata );
181 msg_Dbg( p_dec, "ffmpeg codec (%s) started", p_sys->psz_namecodec );
185 case CODEC_ID_WAVPACK:
186 p_sys->i_output_max = 8 * sizeof(int32_t) * 131072;
189 p_sys->i_output_max = p_sys->p_context->channels * sizeof(int32_t) * p_sys->p_context->sample_rate * 2;
192 p_sys->i_output_max = 8 * sizeof(int32_t) * 65535;
194 case CODEC_ID_WMAPRO:
195 p_sys->i_output_max = 8 * sizeof(float) * 6145; /* (1 << 12) * 3/2 */
198 p_sys->i_output_max = 0;
201 if( p_sys->i_output_max < AVCODEC_MAX_AUDIO_FRAME_SIZE )
202 p_sys->i_output_max = AVCODEC_MAX_AUDIO_FRAME_SIZE;
203 msg_Dbg( p_dec, "Using %d bytes output buffer", p_sys->i_output_max );
204 p_sys->p_output = av_malloc( p_sys->i_output_max );
206 p_sys->p_samples = NULL;
207 p_sys->i_samples = 0;
208 p_sys->i_reject_count = 0;
209 p_sys->b_extract = false;
210 p_sys->i_previous_channels = 0;
211 p_sys->i_previous_layout = 0;
213 date_Set( &p_sys->end_date, 0 );
214 if( p_dec->fmt_in.audio.i_rate )
215 date_Init( &p_sys->end_date, p_dec->fmt_in.audio.i_rate, 1 );
218 p_dec->fmt_out.i_cat = AUDIO_ES;
219 /* Try to set as much informations as possible but do not trust it */
220 SetupOutputFormat( p_dec, false );
225 /*****************************************************************************
226 * SplitBuffer: Needed because aout really doesn't like big audio chunk and
227 * wma produces easily > 30000 samples...
228 *****************************************************************************/
229 static aout_buffer_t *SplitBuffer( decoder_t *p_dec )
231 decoder_sys_t *p_sys = p_dec->p_sys;
232 int i_samples = __MIN( p_sys->i_samples, 4096 );
233 aout_buffer_t *p_buffer;
235 if( i_samples == 0 ) return NULL;
237 if( ( p_buffer = decoder_NewAudioBuffer( p_dec, i_samples ) ) == NULL )
240 p_buffer->start_date = date_Get( &p_sys->end_date );
241 p_buffer->end_date = date_Increment( &p_sys->end_date, i_samples );
243 if( p_sys->b_extract )
244 aout_ChannelExtract( p_buffer->p_buffer, p_dec->fmt_out.audio.i_channels,
245 p_sys->p_samples, p_sys->p_context->channels, i_samples,
246 p_sys->pi_extraction, p_dec->fmt_out.audio.i_bitspersample );
248 memcpy( p_buffer->p_buffer, p_sys->p_samples, p_buffer->i_nb_bytes );
250 p_sys->p_samples += i_samples * p_sys->p_context->channels * ( p_dec->fmt_out.audio.i_bitspersample / 8 );
251 p_sys->i_samples -= i_samples;
256 /*****************************************************************************
257 * DecodeAudio: Called to decode one frame
258 *****************************************************************************/
259 aout_buffer_t * DecodeAudio ( decoder_t *p_dec, block_t **pp_block )
261 decoder_sys_t *p_sys = p_dec->p_sys;
262 int i_used, i_output;
263 aout_buffer_t *p_buffer;
266 if( !pp_block || !*pp_block ) return NULL;
270 if( p_block->i_flags & (BLOCK_FLAG_DISCONTINUITY|BLOCK_FLAG_CORRUPTED) )
272 block_Release( p_block );
273 avcodec_flush_buffers( p_sys->p_context );
274 p_sys->i_samples = 0;
275 date_Set( &p_sys->end_date, 0 );
277 if( p_sys->i_codec_id == CODEC_ID_MP2 || p_sys->i_codec_id == CODEC_ID_MP3 )
278 p_sys->i_reject_count = 3;
282 if( p_sys->i_samples > 0 )
285 p_buffer = SplitBuffer( p_dec );
286 if( !p_buffer ) block_Release( p_block );
290 if( !date_Get( &p_sys->end_date ) && !p_block->i_pts )
292 /* We've just started the stream, wait for the first PTS. */
293 block_Release( p_block );
297 if( p_block->i_buffer <= 0 )
299 block_Release( p_block );
303 i_output = __MAX( p_block->i_buffer, p_sys->i_output_max );
304 if( i_output > p_sys->i_output_max )
306 /* Grow output buffer if necessary (eg. for PCM data) */
307 p_sys->p_output = av_realloc( p_sys->p_output, i_output );
310 *pp_block = p_block = block_Realloc( p_block, 0, p_block->i_buffer + FF_INPUT_BUFFER_PADDING_SIZE );
313 p_block->i_buffer -= FF_INPUT_BUFFER_PADDING_SIZE;
314 memset( &p_block->p_buffer[p_block->i_buffer], 0, FF_INPUT_BUFFER_PADDING_SIZE );
316 #if LIBAVCODEC_VERSION_INT >= ((52<<16)+(0<<8)+0)
317 i_used = avcodec_decode_audio2( p_sys->p_context,
318 (int16_t*)p_sys->p_output, &i_output,
319 p_block->p_buffer, p_block->i_buffer );
321 i_used = avcodec_decode_audio( p_sys->p_context,
322 (int16_t*)p_sys->p_output, &i_output,
323 p_block->p_buffer, p_block->i_buffer );
326 if( i_used < 0 || i_output < 0 )
329 msg_Warn( p_dec, "cannot decode one frame (%zu bytes)",
332 block_Release( p_block );
335 else if( (size_t)i_used > p_block->i_buffer )
337 i_used = p_block->i_buffer;
340 p_block->i_buffer -= i_used;
341 p_block->p_buffer += i_used;
343 if( p_sys->p_context->channels <= 0 || p_sys->p_context->channels > 8 ||
344 p_sys->p_context->sample_rate <= 0 )
346 msg_Warn( p_dec, "invalid audio properties channels count %d, sample rate %d",
347 p_sys->p_context->channels, p_sys->p_context->sample_rate );
348 block_Release( p_block );
352 if( p_dec->fmt_out.audio.i_rate != (unsigned int)p_sys->p_context->sample_rate )
354 date_Init( &p_sys->end_date, p_sys->p_context->sample_rate, 1 );
355 date_Set( &p_sys->end_date, p_block->i_pts );
358 /* **** Set audio output parameters **** */
359 SetupOutputFormat( p_dec, true );
361 if( p_block->i_pts != 0 &&
362 p_block->i_pts != date_Get( &p_sys->end_date ) )
364 date_Set( &p_sys->end_date, p_block->i_pts );
368 /* **** Now we can output these samples **** */
369 p_sys->i_samples = i_output / (p_dec->fmt_out.audio.i_bitspersample / 8) / p_sys->p_context->channels;
370 p_sys->p_samples = p_sys->p_output;
372 /* Silent unwanted samples */
373 if( p_sys->i_reject_count > 0 )
375 memset( p_sys->p_output, 0, i_output );
376 p_sys->i_reject_count--;
379 p_buffer = SplitBuffer( p_dec );
380 if( !p_buffer ) block_Release( p_block );
384 /*****************************************************************************
385 * EndAudioDec: audio decoder destruction
386 *****************************************************************************/
387 void EndAudioDec( decoder_t *p_dec )
389 decoder_sys_t *p_sys = p_dec->p_sys;
391 av_free( p_sys->p_output );
394 /*****************************************************************************
396 *****************************************************************************/
397 #if LIBAVCODEC_VERSION_INT >= AV_VERSION_INT( 52, 2, 0 )
398 # define LIBAVCODEC_AUDIO_LAYOUT
400 # warning "Audio channel layout is unsupported by your avcodec version."
403 #if defined(LIBAVCODEC_AUDIO_LAYOUT)
404 static const uint64_t pi_channels_map[][2] =
406 { CH_FRONT_LEFT, AOUT_CHAN_LEFT },
407 { CH_FRONT_RIGHT, AOUT_CHAN_RIGHT },
408 { CH_FRONT_CENTER, AOUT_CHAN_CENTER },
409 { CH_LOW_FREQUENCY, AOUT_CHAN_LFE },
410 { CH_BACK_LEFT, AOUT_CHAN_REARLEFT },
411 { CH_BACK_RIGHT, AOUT_CHAN_REARRIGHT },
412 { CH_FRONT_LEFT_OF_CENTER, 0 },
413 { CH_FRONT_RIGHT_OF_CENTER, 0 },
414 { CH_BACK_CENTER, AOUT_CHAN_REARCENTER },
415 { CH_SIDE_LEFT, AOUT_CHAN_MIDDLELEFT },
416 { CH_SIDE_RIGHT, AOUT_CHAN_MIDDLERIGHT },
417 { CH_TOP_CENTER, 0 },
418 { CH_TOP_FRONT_LEFT, 0 },
419 { CH_TOP_FRONT_CENTER, 0 },
420 { CH_TOP_FRONT_RIGHT, 0 },
421 { CH_TOP_BACK_LEFT, 0 },
422 { CH_TOP_BACK_CENTER, 0 },
423 { CH_TOP_BACK_RIGHT, 0 },
424 { CH_STEREO_LEFT, 0 },
425 { CH_STEREO_RIGHT, 0 },
428 static const uint64_t pi_channels_map[][2] =
430 { 0, AOUT_CHAN_LEFT },
431 { 0, AOUT_CHAN_RIGHT },
432 { 0, AOUT_CHAN_CENTER },
433 { 0, AOUT_CHAN_LFE },
434 { 0, AOUT_CHAN_REARLEFT },
435 { 0, AOUT_CHAN_REARRIGHT },
438 { 0, AOUT_CHAN_REARCENTER },
439 { 0, AOUT_CHAN_MIDDLELEFT },
440 { 0, AOUT_CHAN_MIDDLERIGHT },
453 static void SetupOutputFormat( decoder_t *p_dec, bool b_trust )
455 decoder_sys_t *p_sys = p_dec->p_sys;
457 #if LIBAVCODEC_VERSION_INT >= AV_VERSION_INT( 51, 65, 0 )
458 switch( p_sys->p_context->sample_fmt )
461 p_dec->fmt_out.i_codec = VLC_CODEC_U8;
462 p_dec->fmt_out.audio.i_bitspersample = 8;
465 p_dec->fmt_out.i_codec = VLC_CODEC_S32N;
466 p_dec->fmt_out.audio.i_bitspersample = 32;
469 p_dec->fmt_out.i_codec = VLC_CODEC_FL32;
470 p_dec->fmt_out.audio.i_bitspersample = 32;
473 p_dec->fmt_out.i_codec = VLC_CODEC_FL64;
474 p_dec->fmt_out.audio.i_bitspersample = 64;
479 p_dec->fmt_out.i_codec = VLC_CODEC_S16N;
480 p_dec->fmt_out.audio.i_bitspersample = 16;
484 p_dec->fmt_out.i_codec = VLC_CODEC_S16N;
485 p_dec->fmt_out.audio.i_bitspersample = 16;
487 p_dec->fmt_out.audio.i_rate = p_sys->p_context->sample_rate;
490 #if defined(LIBAVCODEC_AUDIO_LAYOUT)
491 if( p_sys->i_previous_channels == p_sys->p_context->channels &&
492 p_sys->i_previous_layout == p_sys->p_context->channel_layout )
495 if( p_sys->i_previous_channels == p_sys->p_context->channels )
500 p_sys->i_previous_channels = p_sys->p_context->channels;
501 #if defined(LIBAVCODEC_AUDIO_LAYOUT)
502 p_sys->i_previous_layout = p_sys->p_context->channel_layout;
507 * FIXME should we use fmt_in.audio.i_physical_channels or not ?
509 #if defined(LIBAVCODEC_AUDIO_LAYOUT)
510 const unsigned i_order_max = 8 * sizeof(p_sys->p_context->channel_layout);
512 const unsigned i_order_max = 64;
514 uint32_t pi_order_src[i_order_max];
515 int i_channels_src = 0;
517 #if defined(LIBAVCODEC_AUDIO_LAYOUT)
518 if( p_sys->p_context->channel_layout )
520 for( unsigned i = 0; i < sizeof(pi_channels_map)/sizeof(*pi_channels_map); i++ )
522 if( p_sys->p_context->channel_layout & pi_channels_map[i][0] )
523 pi_order_src[i_channels_src++] = pi_channels_map[i][1];
529 /* Create default order */
531 msg_Warn( p_dec, "Physical channel configuration not set : guessing" );
532 for( unsigned int i = 0; i < __MIN( i_order_max, (unsigned)p_sys->p_context->channels ); i++ )
534 if( i < sizeof(pi_channels_map)/sizeof(*pi_channels_map) )
535 pi_order_src[i_channels_src++] = pi_channels_map[i][1];
538 if( i_channels_src != p_sys->p_context->channels && b_trust )
539 msg_Err( p_dec, "Channel layout not understood" );
541 uint32_t i_layout_dst;
543 p_sys->b_extract = aout_CheckChannelExtraction( p_sys->pi_extraction,
544 &i_layout_dst, &i_channels_dst,
545 NULL, pi_order_src, i_channels_src );
546 if( i_channels_dst != i_channels_src && b_trust )
547 msg_Warn( p_dec, "%d channels are dropped", i_channels_src - i_channels_dst );
549 p_dec->fmt_out.audio.i_physical_channels =
550 p_dec->fmt_out.audio.i_original_channels = i_layout_dst;
551 p_dec->fmt_out.audio.i_channels = i_channels_dst;