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 const 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 #if LIBAVCODEC_VERSION_INT < ((52<<16)+(0<<8)+0)
129 p_sys->p_context->bits_per_sample = p_dec->fmt_in.audio.i_bitspersample;
131 p_sys->p_context->bits_per_coded_sample = p_dec->fmt_in.audio.i_bitspersample;
134 if( p_dec->fmt_in.i_extra > 0 )
136 const uint8_t * const p_src = p_dec->fmt_in.p_extra;
140 if( p_dec->fmt_in.i_codec == VLC_FOURCC( 'f', 'l', 'a', 'c' ) )
143 i_size = p_dec->fmt_in.i_extra - 8;
145 else if( p_dec->fmt_in.i_codec == VLC_FOURCC( 'a', 'l', 'a', 'c' ) )
147 static const uint8_t p_pattern[] = { 0, 0, 0, 36, 'a', 'l', 'a', 'c' };
148 /* Find alac atom XXX it is a bit ugly */
149 for( i_offset = 0; i_offset < p_dec->fmt_in.i_extra - sizeof(p_pattern); i_offset++ )
151 if( !memcmp( &p_src[i_offset], p_pattern, sizeof(p_pattern) ) )
154 i_size = __MIN( p_dec->fmt_in.i_extra - i_offset, 36 );
161 i_size = p_dec->fmt_in.i_extra;
166 p_sys->p_context->extradata =
167 malloc( i_size + FF_INPUT_BUFFER_PADDING_SIZE );
168 if( p_sys->p_context->extradata )
170 uint8_t *p_dst = p_sys->p_context->extradata;
172 p_sys->p_context->extradata_size = i_size;
174 memcpy( &p_dst[0], &p_src[i_offset], i_size );
175 memset( &p_dst[i_size], 0, FF_INPUT_BUFFER_PADDING_SIZE );
181 p_sys->p_context->extradata_size = 0;
182 p_sys->p_context->extradata = NULL;
185 /* ***** Open the codec ***** */
186 vlc_mutex_t *lock = var_AcquireMutex( "avcodec" );
189 free( p_sys->p_context->extradata );
194 if (avcodec_open( p_sys->p_context, p_sys->p_codec ) < 0)
196 vlc_mutex_unlock( lock );
197 msg_Err( p_dec, "cannot open codec (%s)", p_sys->psz_namecodec );
198 free( p_sys->p_context->extradata );
202 vlc_mutex_unlock( lock );
204 msg_Dbg( p_dec, "ffmpeg codec (%s) started", p_sys->psz_namecodec );
206 p_sys->p_output = malloc( AVCODEC_MAX_AUDIO_FRAME_SIZE );
207 p_sys->p_samples = NULL;
208 p_sys->i_samples = 0;
209 p_sys->i_reject_count = 0;
210 p_sys->i_input_rate = INPUT_RATE_DEFAULT;
212 aout_DateSet( &p_sys->end_date, 0 );
213 if( p_dec->fmt_in.audio.i_rate )
214 aout_DateInit( &p_sys->end_date, p_dec->fmt_in.audio.i_rate );
216 /* Set output properties */
217 p_dec->fmt_out.i_cat = AUDIO_ES;
218 p_dec->fmt_out.i_codec = AOUT_FMT_S16_NE;
219 p_dec->fmt_out.audio.i_bitspersample = 16;
224 /*****************************************************************************
225 * SplitBuffer: Needed because aout really doesn't like big audio chunk and
226 * wma produces easily > 30000 samples...
227 *****************************************************************************/
228 static aout_buffer_t *SplitBuffer( decoder_t *p_dec )
230 decoder_sys_t *p_sys = p_dec->p_sys;
231 int i_samples = __MIN( p_sys->i_samples, 4096 );
232 aout_buffer_t *p_buffer;
234 if( i_samples == 0 ) return NULL;
236 if( ( p_buffer = p_dec->pf_aout_buffer_new( p_dec, i_samples ) ) == NULL )
238 msg_Err( p_dec, "cannot get aout buffer" );
242 p_buffer->start_date = aout_DateGet( &p_sys->end_date );
243 p_buffer->end_date = aout_DateIncrement( &p_sys->end_date,
244 i_samples * p_sys->i_input_rate / INPUT_RATE_DEFAULT );
246 memcpy( p_buffer->p_buffer, p_sys->p_samples, p_buffer->i_nb_bytes );
248 p_sys->p_samples += p_buffer->i_nb_bytes;
249 p_sys->i_samples -= i_samples;
254 /*****************************************************************************
255 * DecodeAudio: Called to decode one frame
256 *****************************************************************************/
257 aout_buffer_t * DecodeAudio ( decoder_t *p_dec, block_t **pp_block )
259 decoder_sys_t *p_sys = p_dec->p_sys;
260 int i_used, i_output;
261 aout_buffer_t *p_buffer;
264 if( !pp_block || !*pp_block ) return NULL;
268 if( p_block->i_rate > 0 )
269 p_sys->i_input_rate = p_block->i_rate;
271 if( p_block->i_flags & (BLOCK_FLAG_DISCONTINUITY|BLOCK_FLAG_CORRUPTED) )
273 block_Release( p_block );
274 avcodec_flush_buffers( p_sys->p_context );
276 if( p_sys->i_codec_id == CODEC_ID_MP2 || p_sys->i_codec_id == CODEC_ID_MP3 )
277 p_sys->i_reject_count = 3;
281 if( p_sys->i_samples > 0 )
284 p_buffer = SplitBuffer( p_dec );
285 if( !p_buffer ) block_Release( p_block );
289 if( !aout_DateGet( &p_sys->end_date ) && !p_block->i_pts )
291 /* We've just started the stream, wait for the first PTS. */
292 block_Release( p_block );
296 if( p_block->i_buffer <= 0 )
298 block_Release( p_block );
301 if( p_block->i_buffer > AVCODEC_MAX_AUDIO_FRAME_SIZE )
303 /* Grow output buffer if necessary (eg. for PCM data) */
304 p_sys->p_output = realloc(p_sys->p_output, p_block->i_buffer);
307 *pp_block = p_block = block_Realloc( p_block, 0, p_block->i_buffer + FF_INPUT_BUFFER_PADDING_SIZE );
310 p_block->i_buffer -= FF_INPUT_BUFFER_PADDING_SIZE;
311 memset( &p_block->p_buffer[p_block->i_buffer], 0, FF_INPUT_BUFFER_PADDING_SIZE );
313 #if LIBAVCODEC_VERSION_INT >= ((52<<16)+(0<<8)+0)
314 i_output = __MAX( AVCODEC_MAX_AUDIO_FRAME_SIZE, p_block->i_buffer );
315 i_used = avcodec_decode_audio2( p_sys->p_context,
316 (int16_t*)p_sys->p_output, &i_output,
317 p_block->p_buffer, p_block->i_buffer );
319 i_used = avcodec_decode_audio( p_sys->p_context,
320 (int16_t*)p_sys->p_output, &i_output,
321 p_block->p_buffer, p_block->i_buffer );
324 if( i_used < 0 || i_output < 0 )
327 msg_Warn( p_dec, "cannot decode one frame (%zu bytes)",
330 block_Release( p_block );
333 else if( (size_t)i_used > p_block->i_buffer )
335 i_used = p_block->i_buffer;
338 p_block->i_buffer -= i_used;
339 p_block->p_buffer += i_used;
341 if( p_sys->p_context->channels <= 0 || p_sys->p_context->channels > 6 ||
342 p_sys->p_context->sample_rate <= 0 )
344 msg_Warn( p_dec, "invalid audio properties channels count %d, sample rate %d",
345 p_sys->p_context->channels, p_sys->p_context->sample_rate );
346 block_Release( p_block );
350 if( p_dec->fmt_out.audio.i_rate != (unsigned int)p_sys->p_context->sample_rate )
352 aout_DateInit( &p_sys->end_date, p_sys->p_context->sample_rate );
353 aout_DateSet( &p_sys->end_date, p_block->i_pts );
356 /* **** Set audio output parameters **** */
357 p_dec->fmt_out.audio.i_rate = p_sys->p_context->sample_rate;
358 p_dec->fmt_out.audio.i_channels = p_sys->p_context->channels;
359 p_dec->fmt_out.audio.i_original_channels =
360 p_dec->fmt_out.audio.i_physical_channels =
361 pi_channels_maps[p_sys->p_context->channels];
363 if( p_block->i_pts != 0 &&
364 p_block->i_pts != aout_DateGet( &p_sys->end_date ) )
366 aout_DateSet( &p_sys->end_date, p_block->i_pts );
370 /* **** Now we can output these samples **** */
371 p_sys->i_samples = i_output / sizeof(int16_t) / p_sys->p_context->channels;
372 p_sys->p_samples = p_sys->p_output;
374 /* Silent unwanted samples */
375 if( p_sys->i_reject_count > 0 )
377 memset( p_sys->p_output, 0, i_output );
378 p_sys->i_reject_count--;
381 p_buffer = SplitBuffer( p_dec );
382 if( !p_buffer ) block_Release( p_block );
386 /*****************************************************************************
387 * EndAudioDec: audio decoder destruction
388 *****************************************************************************/
389 void EndAudioDec( decoder_t *p_dec )
391 decoder_sys_t *p_sys = p_dec->p_sys;
393 free( p_sys->p_output );