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_dec->fmt_in.i_extra > 0 )
132 const uint8_t * const p_src = p_dec->fmt_in.p_extra;
136 if( p_dec->fmt_in.i_codec == VLC_FOURCC( 'f', 'l', 'a', 'c' ) )
139 i_size = p_dec->fmt_in.i_extra - 8;
141 else if( p_dec->fmt_in.i_codec == VLC_FOURCC( 'a', 'l', 'a', 'c' ) )
143 static const uint8_t p_pattern[] = { 0, 0, 0, 36, 'a', 'l', 'a', 'c' };
144 /* Find alac atom XXX it is a bit ugly */
145 for( i_offset = 0; i_offset < p_dec->fmt_in.i_extra - sizeof(p_pattern); i_offset++ )
147 if( !memcmp( &p_src[i_offset], p_pattern, sizeof(p_pattern) ) )
150 i_size = __MIN( p_dec->fmt_in.i_extra - i_offset, 36 );
157 i_size = p_dec->fmt_in.i_extra;
162 p_sys->p_context->extradata =
163 malloc( i_size + FF_INPUT_BUFFER_PADDING_SIZE );
164 if( p_sys->p_context->extradata )
166 uint8_t *p_dst = p_sys->p_context->extradata;
168 p_sys->p_context->extradata_size = i_size;
170 memcpy( &p_dst[0], &p_src[i_offset], i_size );
171 memset( &p_dst[i_size], 0, FF_INPUT_BUFFER_PADDING_SIZE );
177 p_sys->p_context->extradata_size = 0;
178 p_sys->p_context->extradata = NULL;
181 /* ***** Open the codec ***** */
182 vlc_mutex_t *lock = var_AcquireMutex( "avcodec" );
185 free( p_sys->p_context->extradata );
190 if (avcodec_open( p_sys->p_context, p_sys->p_codec ) < 0)
192 vlc_mutex_unlock( lock );
193 msg_Err( p_dec, "cannot open codec (%s)", p_sys->psz_namecodec );
194 free( p_sys->p_context->extradata );
198 vlc_mutex_unlock( lock );
200 msg_Dbg( p_dec, "ffmpeg codec (%s) started", p_sys->psz_namecodec );
202 p_sys->p_output = malloc( AVCODEC_MAX_AUDIO_FRAME_SIZE );
203 p_sys->p_samples = NULL;
204 p_sys->i_samples = 0;
205 p_sys->i_reject_count = 0;
206 p_sys->i_input_rate = INPUT_RATE_DEFAULT;
208 aout_DateSet( &p_sys->end_date, 0 );
209 if( p_dec->fmt_in.audio.i_rate )
210 aout_DateInit( &p_sys->end_date, p_dec->fmt_in.audio.i_rate );
212 /* Set output properties */
213 p_dec->fmt_out.i_cat = AUDIO_ES;
214 p_dec->fmt_out.i_codec = AOUT_FMT_S16_NE;
215 p_dec->fmt_out.audio.i_bitspersample = 16;
220 /*****************************************************************************
221 * SplitBuffer: Needed because aout really doesn't like big audio chunk and
222 * wma produces easily > 30000 samples...
223 *****************************************************************************/
224 static aout_buffer_t *SplitBuffer( decoder_t *p_dec )
226 decoder_sys_t *p_sys = p_dec->p_sys;
227 int i_samples = __MIN( p_sys->i_samples, 4096 );
228 aout_buffer_t *p_buffer;
230 if( i_samples == 0 ) return NULL;
232 if( ( p_buffer = p_dec->pf_aout_buffer_new( p_dec, i_samples ) ) == NULL )
234 msg_Err( p_dec, "cannot get aout buffer" );
238 p_buffer->start_date = aout_DateGet( &p_sys->end_date );
239 p_buffer->end_date = aout_DateIncrement( &p_sys->end_date,
240 i_samples * p_sys->i_input_rate / INPUT_RATE_DEFAULT );
242 memcpy( p_buffer->p_buffer, p_sys->p_samples, p_buffer->i_nb_bytes );
244 p_sys->p_samples += p_buffer->i_nb_bytes;
245 p_sys->i_samples -= i_samples;
250 /*****************************************************************************
251 * DecodeAudio: Called to decode one frame
252 *****************************************************************************/
253 aout_buffer_t * DecodeAudio ( decoder_t *p_dec, block_t **pp_block )
255 decoder_sys_t *p_sys = p_dec->p_sys;
256 int i_used, i_output;
257 aout_buffer_t *p_buffer;
260 if( !pp_block || !*pp_block ) return NULL;
264 if( p_block->i_rate > 0 )
265 p_sys->i_input_rate = p_block->i_rate;
267 if( p_block->i_flags & (BLOCK_FLAG_DISCONTINUITY|BLOCK_FLAG_CORRUPTED) )
269 block_Release( p_block );
270 avcodec_flush_buffers( p_sys->p_context );
272 if( p_sys->i_codec_id == CODEC_ID_MP2 || p_sys->i_codec_id == CODEC_ID_MP3 )
273 p_sys->i_reject_count = 3;
277 if( p_sys->i_samples > 0 )
280 p_buffer = SplitBuffer( p_dec );
281 if( !p_buffer ) block_Release( p_block );
285 if( !aout_DateGet( &p_sys->end_date ) && !p_block->i_pts )
287 /* We've just started the stream, wait for the first PTS. */
288 block_Release( p_block );
292 if( p_block->i_buffer <= 0 )
294 block_Release( p_block );
297 if( p_block->i_buffer > AVCODEC_MAX_AUDIO_FRAME_SIZE )
299 /* Grow output buffer if necessary (eg. for PCM data) */
300 p_sys->p_output = realloc(p_sys->p_output, p_block->i_buffer);
303 *pp_block = p_block = block_Realloc( p_block, 0, p_block->i_buffer + FF_INPUT_BUFFER_PADDING_SIZE );
306 p_block->i_buffer -= FF_INPUT_BUFFER_PADDING_SIZE;
307 memset( &p_block->p_buffer[p_block->i_buffer], 0, FF_INPUT_BUFFER_PADDING_SIZE );
309 #if LIBAVCODEC_VERSION_INT >= ((52<<16)+(0<<8)+0)
310 i_output = __MAX( AVCODEC_MAX_AUDIO_FRAME_SIZE, p_block->i_buffer );
311 i_used = avcodec_decode_audio2( p_sys->p_context,
312 (int16_t*)p_sys->p_output, &i_output,
313 p_block->p_buffer, p_block->i_buffer );
315 i_used = avcodec_decode_audio( p_sys->p_context,
316 (int16_t*)p_sys->p_output, &i_output,
317 p_block->p_buffer, p_block->i_buffer );
320 if( i_used < 0 || i_output < 0 )
323 msg_Warn( p_dec, "cannot decode one frame (%zu bytes)",
326 block_Release( p_block );
329 else if( (size_t)i_used > p_block->i_buffer )
331 i_used = p_block->i_buffer;
334 p_block->i_buffer -= i_used;
335 p_block->p_buffer += i_used;
337 if( p_sys->p_context->channels <= 0 || p_sys->p_context->channels > 6 ||
338 p_sys->p_context->sample_rate <= 0 )
340 msg_Warn( p_dec, "invalid audio properties channels count %d, sample rate %d",
341 p_sys->p_context->channels, p_sys->p_context->sample_rate );
342 block_Release( p_block );
346 if( p_dec->fmt_out.audio.i_rate != (unsigned int)p_sys->p_context->sample_rate )
348 aout_DateInit( &p_sys->end_date, p_sys->p_context->sample_rate );
349 aout_DateSet( &p_sys->end_date, p_block->i_pts );
352 /* **** Set audio output parameters **** */
353 p_dec->fmt_out.audio.i_rate = p_sys->p_context->sample_rate;
354 p_dec->fmt_out.audio.i_channels = p_sys->p_context->channels;
355 p_dec->fmt_out.audio.i_original_channels =
356 p_dec->fmt_out.audio.i_physical_channels =
357 pi_channels_maps[p_sys->p_context->channels];
359 if( p_block->i_pts != 0 &&
360 p_block->i_pts != aout_DateGet( &p_sys->end_date ) )
362 aout_DateSet( &p_sys->end_date, p_block->i_pts );
366 /* **** Now we can output these samples **** */
367 p_sys->i_samples = i_output / sizeof(int16_t) / p_sys->p_context->channels;
368 p_sys->p_samples = p_sys->p_output;
370 /* Silent unwanted samples */
371 if( p_sys->i_reject_count > 0 )
373 memset( p_sys->p_output, 0, i_output );
374 p_sys->i_reject_count--;
377 p_buffer = SplitBuffer( p_dec );
378 if( !p_buffer ) block_Release( p_block );
382 /*****************************************************************************
383 * EndAudioDec: audio decoder destruction
384 *****************************************************************************/
385 void EndAudioDec( decoder_t *p_dec )
387 decoder_sys_t *p_sys = p_dec->p_sys;
389 free( p_sys->p_output );