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>
37 #ifdef HAVE_LIBAVCODEC_AVCODEC_H
38 # include <libavcodec/avcodec.h>
39 #elif defined(HAVE_FFMPEG_AVCODEC_H)
40 # include <ffmpeg/avcodec.h>
47 static const unsigned int pi_channels_maps[9] =
51 AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT,
52 AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER,
53 AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT,
54 AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER |
55 AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT,
56 AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER |
57 AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT | AOUT_CHAN_LFE,
58 AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER |
59 AOUT_CHAN_MIDDLELEFT | AOUT_CHAN_MIDDLERIGHT |
60 AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT,
61 AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER |
62 AOUT_CHAN_MIDDLELEFT | AOUT_CHAN_MIDDLERIGHT |
63 AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT | AOUT_CHAN_LFE,
66 /*****************************************************************************
67 * decoder_sys_t : decoder descriptor
68 *****************************************************************************/
73 /* Temporary buffer for libavcodec */
79 audio_sample_format_t aout_format;
80 audio_date_t end_date;
92 /*****************************************************************************
93 * InitAudioDec: initialize audio decoder
94 *****************************************************************************
95 * The ffmpeg codec will be opened, some memory allocated.
96 *****************************************************************************/
97 int InitAudioDec( decoder_t *p_dec, AVCodecContext *p_context,
98 AVCodec *p_codec, int i_codec_id, const char *psz_namecodec )
100 decoder_sys_t *p_sys;
102 /* Allocate the memory needed to store the decoder's structure */
103 if( ( p_dec->p_sys = p_sys =
104 (decoder_sys_t *)malloc(sizeof(decoder_sys_t)) ) == NULL )
109 p_sys->p_context = p_context;
110 p_sys->p_codec = p_codec;
111 p_sys->i_codec_id = i_codec_id;
112 p_sys->psz_namecodec = psz_namecodec;
113 p_sys->b_delayed_open = false;
115 /* ***** Fill p_context with init values ***** */
116 p_sys->p_context->sample_rate = p_dec->fmt_in.audio.i_rate;
117 p_sys->p_context->channels = p_dec->fmt_in.audio.i_channels;
118 if( !p_dec->fmt_in.audio.i_physical_channels )
120 msg_Warn( p_dec, "Physical channel configuration not set : guessing" );
121 p_dec->fmt_in.audio.i_original_channels =
122 p_dec->fmt_in.audio.i_physical_channels =
123 pi_channels_maps[p_sys->p_context->channels];
126 p_dec->fmt_out.audio.i_physical_channels =
127 p_dec->fmt_out.audio.i_original_channels =
128 p_dec->fmt_in.audio.i_physical_channels;
130 p_sys->p_context->block_align = p_dec->fmt_in.audio.i_blockalign;
131 p_sys->p_context->bit_rate = p_dec->fmt_in.i_bitrate;
132 #if LIBAVCODEC_VERSION_INT < ((52<<16)+(0<<8)+0)
133 p_sys->p_context->bits_per_sample = p_dec->fmt_in.audio.i_bitspersample;
135 p_sys->p_context->bits_per_coded_sample = p_dec->fmt_in.audio.i_bitspersample;
138 if( p_dec->fmt_in.i_extra > 0 )
140 const uint8_t * const p_src = p_dec->fmt_in.p_extra;
144 if( p_dec->fmt_in.i_codec == VLC_FOURCC( 'f', 'l', 'a', 'c' ) )
147 i_size = p_dec->fmt_in.i_extra - 8;
149 else if( p_dec->fmt_in.i_codec == VLC_FOURCC( 'a', 'l', 'a', 'c' ) )
151 static const uint8_t p_pattern[] = { 0, 0, 0, 36, 'a', 'l', 'a', 'c' };
152 /* Find alac atom XXX it is a bit ugly */
153 for( i_offset = 0; i_offset < p_dec->fmt_in.i_extra - sizeof(p_pattern); i_offset++ )
155 if( !memcmp( &p_src[i_offset], p_pattern, sizeof(p_pattern) ) )
158 i_size = __MIN( p_dec->fmt_in.i_extra - i_offset, 36 );
165 i_size = p_dec->fmt_in.i_extra;
170 p_sys->p_context->extradata =
171 malloc( i_size + FF_INPUT_BUFFER_PADDING_SIZE );
172 if( p_sys->p_context->extradata )
174 uint8_t *p_dst = p_sys->p_context->extradata;
176 p_sys->p_context->extradata_size = i_size;
178 memcpy( &p_dst[0], &p_src[i_offset], i_size );
179 memset( &p_dst[i_size], 0, FF_INPUT_BUFFER_PADDING_SIZE );
185 p_sys->p_context->extradata_size = 0;
186 p_sys->p_context->extradata = NULL;
189 /* ***** Open the codec ***** */
190 vlc_mutex_lock( &avcodec_lock );
192 if (avcodec_open( p_sys->p_context, p_sys->p_codec ) < 0)
194 vlc_mutex_unlock( &avcodec_lock );
195 msg_Err( p_dec, "cannot open codec (%s)", p_sys->psz_namecodec );
196 free( p_sys->p_context->extradata );
200 vlc_mutex_unlock( &avcodec_lock );
202 msg_Dbg( p_dec, "ffmpeg codec (%s) started", p_sys->psz_namecodec );
204 p_sys->p_output = malloc( AVCODEC_MAX_AUDIO_FRAME_SIZE );
205 p_sys->p_samples = NULL;
206 p_sys->i_samples = 0;
207 p_sys->i_reject_count = 0;
209 aout_DateSet( &p_sys->end_date, 0 );
210 if( p_dec->fmt_in.audio.i_rate )
211 aout_DateInit( &p_sys->end_date, p_dec->fmt_in.audio.i_rate );
213 /* Set output properties */
214 p_dec->fmt_out.i_cat = AUDIO_ES;
216 #if defined(AV_VERSION_INT) && LIBAVCODEC_VERSION_INT >= AV_VERSION_INT( 51, 65, 0 )
217 switch( p_sys->p_context->sample_fmt )
220 p_dec->fmt_out.i_codec = VLC_FOURCC('u','8',' ',' ');
221 p_dec->fmt_out.audio.i_bitspersample = 8;
224 p_dec->fmt_out.i_codec = AOUT_FMT_S32_NE;
225 p_dec->fmt_out.audio.i_bitspersample = 32;
228 p_dec->fmt_out.i_codec = VLC_FOURCC('f','l','3','2');
229 p_dec->fmt_out.audio.i_bitspersample = 32;
232 p_dec->fmt_out.i_codec = VLC_FOURCC('f','l','6','4');
233 p_dec->fmt_out.audio.i_bitspersample = 64;
238 p_dec->fmt_out.i_codec = AOUT_FMT_S16_NE;
239 p_dec->fmt_out.audio.i_bitspersample = 16;
243 p_dec->fmt_out.i_codec = AOUT_FMT_S16_NE;
244 p_dec->fmt_out.audio.i_bitspersample = 16;
250 /*****************************************************************************
251 * SplitBuffer: Needed because aout really doesn't like big audio chunk and
252 * wma produces easily > 30000 samples...
253 *****************************************************************************/
254 static aout_buffer_t *SplitBuffer( decoder_t *p_dec )
256 decoder_sys_t *p_sys = p_dec->p_sys;
257 int i_samples = __MIN( p_sys->i_samples, 4096 );
258 aout_buffer_t *p_buffer;
260 if( i_samples == 0 ) return NULL;
262 if( ( p_buffer = decoder_NewAudioBuffer( p_dec, i_samples ) ) == NULL )
265 p_buffer->start_date = aout_DateGet( &p_sys->end_date );
266 p_buffer->end_date = aout_DateIncrement( &p_sys->end_date, i_samples );
268 memcpy( p_buffer->p_buffer, p_sys->p_samples, p_buffer->i_nb_bytes );
270 p_sys->p_samples += p_buffer->i_nb_bytes;
271 p_sys->i_samples -= i_samples;
276 /*****************************************************************************
277 * DecodeAudio: Called to decode one frame
278 *****************************************************************************/
279 aout_buffer_t * DecodeAudio ( decoder_t *p_dec, block_t **pp_block )
281 decoder_sys_t *p_sys = p_dec->p_sys;
282 int i_used, i_output;
283 aout_buffer_t *p_buffer;
286 if( !pp_block || !*pp_block ) return NULL;
290 if( p_block->i_flags & (BLOCK_FLAG_DISCONTINUITY|BLOCK_FLAG_CORRUPTED) )
292 block_Release( p_block );
293 avcodec_flush_buffers( p_sys->p_context );
294 p_sys->i_samples = 0;
295 aout_DateSet( &p_sys->end_date, 0 );
297 if( p_sys->i_codec_id == CODEC_ID_MP2 || p_sys->i_codec_id == CODEC_ID_MP3 )
298 p_sys->i_reject_count = 3;
302 if( p_sys->i_samples > 0 )
305 p_buffer = SplitBuffer( p_dec );
306 if( !p_buffer ) block_Release( p_block );
310 if( !aout_DateGet( &p_sys->end_date ) && !p_block->i_pts )
312 /* We've just started the stream, wait for the first PTS. */
313 block_Release( p_block );
317 if( p_block->i_buffer <= 0 )
319 block_Release( p_block );
322 if( p_block->i_buffer > AVCODEC_MAX_AUDIO_FRAME_SIZE )
324 /* Grow output buffer if necessary (eg. for PCM data) */
325 p_sys->p_output = realloc(p_sys->p_output, p_block->i_buffer);
328 *pp_block = p_block = block_Realloc( p_block, 0, p_block->i_buffer + FF_INPUT_BUFFER_PADDING_SIZE );
331 p_block->i_buffer -= FF_INPUT_BUFFER_PADDING_SIZE;
332 memset( &p_block->p_buffer[p_block->i_buffer], 0, FF_INPUT_BUFFER_PADDING_SIZE );
334 #if LIBAVCODEC_VERSION_INT >= ((52<<16)+(0<<8)+0)
335 i_output = __MAX( AVCODEC_MAX_AUDIO_FRAME_SIZE, p_block->i_buffer );
336 i_used = avcodec_decode_audio2( p_sys->p_context,
337 (int16_t*)p_sys->p_output, &i_output,
338 p_block->p_buffer, p_block->i_buffer );
340 i_used = avcodec_decode_audio( p_sys->p_context,
341 (int16_t*)p_sys->p_output, &i_output,
342 p_block->p_buffer, p_block->i_buffer );
345 if( i_used < 0 || i_output < 0 )
348 msg_Warn( p_dec, "cannot decode one frame (%zu bytes)",
351 block_Release( p_block );
354 else if( (size_t)i_used > p_block->i_buffer )
356 i_used = p_block->i_buffer;
359 p_block->i_buffer -= i_used;
360 p_block->p_buffer += i_used;
362 if( p_sys->p_context->channels <= 0 || p_sys->p_context->channels > 8 ||
363 p_sys->p_context->sample_rate <= 0 )
365 msg_Warn( p_dec, "invalid audio properties channels count %d, sample rate %d",
366 p_sys->p_context->channels, p_sys->p_context->sample_rate );
367 block_Release( p_block );
371 if( p_dec->fmt_out.audio.i_rate != (unsigned int)p_sys->p_context->sample_rate )
373 aout_DateInit( &p_sys->end_date, p_sys->p_context->sample_rate );
374 aout_DateSet( &p_sys->end_date, p_block->i_pts );
377 /* **** Set audio output parameters **** */
378 p_dec->fmt_out.audio.i_rate = p_sys->p_context->sample_rate;
379 p_dec->fmt_out.audio.i_channels = p_sys->p_context->channels;
380 p_dec->fmt_out.audio.i_original_channels =
381 p_dec->fmt_out.audio.i_physical_channels =
382 pi_channels_maps[p_sys->p_context->channels];
384 if( p_block->i_pts != 0 &&
385 p_block->i_pts != aout_DateGet( &p_sys->end_date ) )
387 aout_DateSet( &p_sys->end_date, p_block->i_pts );
391 /* **** Now we can output these samples **** */
392 p_sys->i_samples = i_output / (p_dec->fmt_out.audio.i_bitspersample / 8) / p_sys->p_context->channels;
393 p_sys->p_samples = p_sys->p_output;
395 /* Silent unwanted samples */
396 if( p_sys->i_reject_count > 0 )
398 memset( p_sys->p_output, 0, i_output );
399 p_sys->i_reject_count--;
402 p_buffer = SplitBuffer( p_dec );
403 if( !p_buffer ) block_Release( p_block );
407 /*****************************************************************************
408 * EndAudioDec: audio decoder destruction
409 *****************************************************************************/
410 void EndAudioDec( decoder_t *p_dec )
412 decoder_sys_t *p_sys = p_dec->p_sys;
414 free( p_sys->p_output );