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 #define BLOCK_FLAG_PRIVATE_REALLOCATED (1 << BLOCK_FLAG_PRIVATE_SHIFT)
83 static void SetupOutputFormat( decoder_t *p_dec, bool b_trust );
85 static void InitDecoderConfig( decoder_t *p_dec, AVCodecContext *p_context )
87 if( p_dec->fmt_in.i_extra > 0 )
89 const uint8_t * const p_src = p_dec->fmt_in.p_extra;
93 if( p_dec->fmt_in.i_codec == VLC_CODEC_FLAC )
96 i_size = p_dec->fmt_in.i_extra - 8;
98 else if( p_dec->fmt_in.i_codec == VLC_CODEC_ALAC )
100 static const uint8_t p_pattern[] = { 0, 0, 0, 36, 'a', 'l', 'a', 'c' };
101 /* Find alac atom XXX it is a bit ugly */
102 for( i_offset = 0; i_offset < p_dec->fmt_in.i_extra - sizeof(p_pattern); i_offset++ )
104 if( !memcmp( &p_src[i_offset], p_pattern, sizeof(p_pattern) ) )
107 i_size = __MIN( p_dec->fmt_in.i_extra - i_offset, 36 );
114 i_size = p_dec->fmt_in.i_extra;
119 p_context->extradata =
120 malloc( i_size + FF_INPUT_BUFFER_PADDING_SIZE );
121 if( p_context->extradata )
123 uint8_t *p_dst = p_context->extradata;
125 p_context->extradata_size = i_size;
127 memcpy( &p_dst[0], &p_src[i_offset], i_size );
128 memset( &p_dst[i_size], 0, FF_INPUT_BUFFER_PADDING_SIZE );
134 p_context->extradata_size = 0;
135 p_context->extradata = NULL;
139 /*****************************************************************************
140 * InitAudioDec: initialize audio decoder
141 *****************************************************************************
142 * The ffmpeg codec will be opened, some memory allocated.
143 *****************************************************************************/
144 int InitAudioDec( decoder_t *p_dec, AVCodecContext *p_context,
145 AVCodec *p_codec, int i_codec_id, const char *psz_namecodec )
147 decoder_sys_t *p_sys;
149 /* Allocate the memory needed to store the decoder's structure */
150 if( ( p_dec->p_sys = p_sys = malloc(sizeof(*p_sys)) ) == NULL )
155 p_codec->type = CODEC_TYPE_AUDIO;
156 p_context->codec_type = CODEC_TYPE_AUDIO;
157 p_context->codec_id = i_codec_id;
158 p_sys->p_context = p_context;
159 p_sys->p_codec = p_codec;
160 p_sys->i_codec_id = i_codec_id;
161 p_sys->psz_namecodec = psz_namecodec;
162 p_sys->b_delayed_open = false;
164 // Initialize decoder extradata
165 InitDecoderConfig( p_dec, p_context);
167 /* ***** Fill p_context with init values ***** */
168 p_sys->p_context->sample_rate = p_dec->fmt_in.audio.i_rate;
169 p_sys->p_context->channels = p_dec->fmt_in.audio.i_channels;
171 p_sys->p_context->block_align = p_dec->fmt_in.audio.i_blockalign;
172 p_sys->p_context->bit_rate = p_dec->fmt_in.i_bitrate;
173 p_sys->p_context->bits_per_coded_sample = p_dec->fmt_in.audio.i_bitspersample;
175 /* ***** Open the codec ***** */
178 ret = avcodec_open( p_sys->p_context, p_sys->p_codec );
179 vlc_avcodec_unlock();
182 msg_Err( p_dec, "cannot open codec (%s)", p_sys->psz_namecodec );
183 free( p_sys->p_context->extradata );
188 msg_Dbg( p_dec, "ffmpeg codec (%s) started", p_sys->psz_namecodec );
192 case CODEC_ID_WAVPACK:
193 p_sys->i_output_max = 8 * sizeof(int32_t) * 131072;
196 p_sys->i_output_max = p_sys->p_context->channels * sizeof(int32_t) * p_sys->p_context->sample_rate * 2;
199 p_sys->i_output_max = 8 * sizeof(int32_t) * 65535;
201 #if LIBAVCODEC_VERSION_INT >= AV_VERSION_INT( 52, 35, 0 )
202 case CODEC_ID_WMAPRO:
203 p_sys->i_output_max = 8 * sizeof(float) * 6144; /* (1 << 12) * 3/2 */
207 p_sys->i_output_max = 0;
210 if( p_sys->i_output_max < AVCODEC_MAX_AUDIO_FRAME_SIZE )
211 p_sys->i_output_max = AVCODEC_MAX_AUDIO_FRAME_SIZE;
212 msg_Dbg( p_dec, "Using %d bytes output buffer", p_sys->i_output_max );
213 p_sys->p_output = av_malloc( p_sys->i_output_max );
215 p_sys->p_samples = NULL;
216 p_sys->i_samples = 0;
217 p_sys->i_reject_count = 0;
218 p_sys->b_extract = false;
219 p_sys->i_previous_channels = 0;
220 p_sys->i_previous_layout = 0;
223 p_dec->fmt_out.i_cat = AUDIO_ES;
224 /* Try to set as much information as possible but do not trust it */
225 SetupOutputFormat( p_dec, false );
227 date_Set( &p_sys->end_date, 0 );
228 if( p_dec->fmt_out.audio.i_rate )
229 date_Init( &p_sys->end_date, p_dec->fmt_out.audio.i_rate, 1 );
230 else if( p_dec->fmt_in.audio.i_rate )
231 date_Init( &p_sys->end_date, p_dec->fmt_in.audio.i_rate, 1 );
236 /*****************************************************************************
237 * SplitBuffer: Needed because aout really doesn't like big audio chunk and
238 * wma produces easily > 30000 samples...
239 *****************************************************************************/
240 static aout_buffer_t *SplitBuffer( decoder_t *p_dec )
242 decoder_sys_t *p_sys = p_dec->p_sys;
243 int i_samples = __MIN( p_sys->i_samples, 4096 );
244 aout_buffer_t *p_buffer;
246 if( i_samples == 0 ) return NULL;
248 if( ( p_buffer = decoder_NewAudioBuffer( p_dec, i_samples ) ) == NULL )
251 p_buffer->i_pts = date_Get( &p_sys->end_date );
252 p_buffer->i_length = date_Increment( &p_sys->end_date, i_samples )
255 if( p_sys->b_extract )
256 aout_ChannelExtract( p_buffer->p_buffer, p_dec->fmt_out.audio.i_channels,
257 p_sys->p_samples, p_sys->p_context->channels, i_samples,
258 p_sys->pi_extraction, p_dec->fmt_out.audio.i_bitspersample );
260 memcpy( p_buffer->p_buffer, p_sys->p_samples, p_buffer->i_buffer );
262 p_sys->p_samples += i_samples * p_sys->p_context->channels * ( p_dec->fmt_out.audio.i_bitspersample / 8 );
263 p_sys->i_samples -= i_samples;
268 /*****************************************************************************
269 * DecodeAudio: Called to decode one frame
270 *****************************************************************************/
271 aout_buffer_t * DecodeAudio ( decoder_t *p_dec, block_t **pp_block )
273 decoder_sys_t *p_sys = p_dec->p_sys;
274 int i_used, i_output;
275 aout_buffer_t *p_buffer;
278 if( !pp_block || !*pp_block ) return NULL;
282 if( p_block->i_flags & (BLOCK_FLAG_DISCONTINUITY|BLOCK_FLAG_CORRUPTED) )
284 block_Release( p_block );
285 avcodec_flush_buffers( p_sys->p_context );
286 p_sys->i_samples = 0;
287 date_Set( &p_sys->end_date, 0 );
289 if( p_sys->i_codec_id == CODEC_ID_MP2 || p_sys->i_codec_id == CODEC_ID_MP3 )
290 p_sys->i_reject_count = 3;
294 if( p_sys->i_samples > 0 )
297 p_buffer = SplitBuffer( p_dec );
298 if( !p_buffer ) block_Release( p_block );
302 if( !date_Get( &p_sys->end_date ) && !p_block->i_pts )
304 /* We've just started the stream, wait for the first PTS. */
305 block_Release( p_block );
309 if( p_block->i_buffer <= 0 )
311 block_Release( p_block );
315 if( (p_block->i_flags & BLOCK_FLAG_PRIVATE_REALLOCATED) == 0 )
317 *pp_block = p_block = block_Realloc( p_block, 0, p_block->i_buffer + FF_INPUT_BUFFER_PADDING_SIZE );
320 p_block->i_buffer -= FF_INPUT_BUFFER_PADDING_SIZE;
321 memset( &p_block->p_buffer[p_block->i_buffer], 0, FF_INPUT_BUFFER_PADDING_SIZE );
323 p_block->i_flags |= BLOCK_FLAG_PRIVATE_REALLOCATED;
328 i_output = __MAX( p_block->i_buffer, p_sys->i_output_max );
329 if( i_output > p_sys->i_output_max )
331 /* Grow output buffer if necessary (eg. for PCM data) */
332 p_sys->p_output = av_realloc( p_sys->p_output, i_output );
335 i_used = avcodec_decode_audio2( p_sys->p_context,
336 (int16_t*)p_sys->p_output, &i_output,
337 p_block->p_buffer, p_block->i_buffer );
339 if( i_used < 0 || i_output < 0 )
342 msg_Warn( p_dec, "cannot decode one frame (%zu bytes)",
345 block_Release( p_block );
348 else if( (size_t)i_used > p_block->i_buffer )
350 i_used = p_block->i_buffer;
353 p_block->i_buffer -= i_used;
354 p_block->p_buffer += i_used;
356 } while( p_block->i_buffer > 0 && i_output <= 0 );
358 if( p_sys->p_context->channels <= 0 || p_sys->p_context->channels > 8 ||
359 p_sys->p_context->sample_rate <= 0 )
361 msg_Warn( p_dec, "invalid audio properties channels count %d, sample rate %d",
362 p_sys->p_context->channels, p_sys->p_context->sample_rate );
363 block_Release( p_block );
367 if( p_dec->fmt_out.audio.i_rate != (unsigned int)p_sys->p_context->sample_rate )
369 date_Init( &p_sys->end_date, p_sys->p_context->sample_rate, 1 );
370 date_Set( &p_sys->end_date, p_block->i_pts );
373 /* **** Set audio output parameters **** */
374 SetupOutputFormat( p_dec, true );
376 if( p_block->i_pts != 0 &&
377 p_block->i_pts != date_Get( &p_sys->end_date ) )
379 date_Set( &p_sys->end_date, p_block->i_pts );
383 /* **** Now we can output these samples **** */
384 p_sys->i_samples = i_output / (p_dec->fmt_out.audio.i_bitspersample / 8) / p_sys->p_context->channels;
385 p_sys->p_samples = p_sys->p_output;
387 /* Silent unwanted samples */
388 if( p_sys->i_reject_count > 0 )
390 memset( p_sys->p_output, 0, i_output );
391 p_sys->i_reject_count--;
394 p_buffer = SplitBuffer( p_dec );
395 if( !p_buffer ) block_Release( p_block );
399 /*****************************************************************************
400 * EndAudioDec: audio decoder destruction
401 *****************************************************************************/
402 void EndAudioDec( decoder_t *p_dec )
404 decoder_sys_t *p_sys = p_dec->p_sys;
406 av_free( p_sys->p_output );
409 /*****************************************************************************
411 *****************************************************************************/
413 void GetVlcAudioFormat( vlc_fourcc_t *pi_codec, unsigned *pi_bits, int i_sample_fmt )
415 switch( i_sample_fmt )
418 *pi_codec = VLC_CODEC_U8;
422 *pi_codec = VLC_CODEC_S32N;
426 *pi_codec = VLC_CODEC_FL32;
430 *pi_codec = VLC_CODEC_FL64;
436 *pi_codec = VLC_CODEC_S16N;
442 static const uint64_t pi_channels_map[][2] =
444 { CH_FRONT_LEFT, AOUT_CHAN_LEFT },
445 { CH_FRONT_RIGHT, AOUT_CHAN_RIGHT },
446 { CH_FRONT_CENTER, AOUT_CHAN_CENTER },
447 { CH_LOW_FREQUENCY, AOUT_CHAN_LFE },
448 { CH_BACK_LEFT, AOUT_CHAN_REARLEFT },
449 { CH_BACK_RIGHT, AOUT_CHAN_REARRIGHT },
450 { CH_FRONT_LEFT_OF_CENTER, 0 },
451 { CH_FRONT_RIGHT_OF_CENTER, 0 },
452 { CH_BACK_CENTER, AOUT_CHAN_REARCENTER },
453 { CH_SIDE_LEFT, AOUT_CHAN_MIDDLELEFT },
454 { CH_SIDE_RIGHT, AOUT_CHAN_MIDDLERIGHT },
455 { CH_TOP_CENTER, 0 },
456 { CH_TOP_FRONT_LEFT, 0 },
457 { CH_TOP_FRONT_CENTER, 0 },
458 { CH_TOP_FRONT_RIGHT, 0 },
459 { CH_TOP_BACK_LEFT, 0 },
460 { CH_TOP_BACK_CENTER, 0 },
461 { CH_TOP_BACK_RIGHT, 0 },
462 { CH_STEREO_LEFT, 0 },
463 { CH_STEREO_RIGHT, 0 },
466 static void SetupOutputFormat( decoder_t *p_dec, bool b_trust )
468 decoder_sys_t *p_sys = p_dec->p_sys;
470 GetVlcAudioFormat( &p_dec->fmt_out.i_codec,
471 &p_dec->fmt_out.audio.i_bitspersample,
472 p_sys->p_context->sample_fmt );
473 p_dec->fmt_out.audio.i_rate = p_sys->p_context->sample_rate;
476 if( p_sys->i_previous_channels == p_sys->p_context->channels &&
477 p_sys->i_previous_layout == p_sys->p_context->channel_layout )
481 p_sys->i_previous_channels = p_sys->p_context->channels;
482 p_sys->i_previous_layout = p_sys->p_context->channel_layout;
486 * FIXME should we use fmt_in.audio.i_physical_channels or not ?
488 const unsigned i_order_max = 8 * sizeof(p_sys->p_context->channel_layout);
489 uint32_t pi_order_src[i_order_max];
490 int i_channels_src = 0;
492 if( p_sys->p_context->channel_layout )
494 for( unsigned i = 0; i < sizeof(pi_channels_map)/sizeof(*pi_channels_map); i++ )
496 if( p_sys->p_context->channel_layout & pi_channels_map[i][0] )
497 pi_order_src[i_channels_src++] = pi_channels_map[i][1];
502 /* Create default order */
504 msg_Warn( p_dec, "Physical channel configuration not set : guessing" );
505 for( unsigned int i = 0; i < __MIN( i_order_max, (unsigned)p_sys->p_context->channels ); i++ )
507 if( i < sizeof(pi_channels_map)/sizeof(*pi_channels_map) )
508 pi_order_src[i_channels_src++] = pi_channels_map[i][1];
511 if( i_channels_src != p_sys->p_context->channels && b_trust )
512 msg_Err( p_dec, "Channel layout not understood" );
514 uint32_t i_layout_dst;
516 p_sys->b_extract = aout_CheckChannelExtraction( p_sys->pi_extraction,
517 &i_layout_dst, &i_channels_dst,
518 NULL, pi_order_src, i_channels_src );
519 if( i_channels_dst != i_channels_src && b_trust )
520 msg_Warn( p_dec, "%d channels are dropped", i_channels_src - i_channels_dst );
522 p_dec->fmt_out.audio.i_physical_channels =
523 p_dec->fmt_out.audio.i_original_channels = i_layout_dst;
524 p_dec->fmt_out.audio.i_channels = i_channels_dst;