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 *****************************************************************************/
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 )
103 msg_Err( p_dec, "out of memory" );
107 p_sys->p_context = p_context;
108 p_sys->p_codec = p_codec;
109 p_sys->i_codec_id = i_codec_id;
110 p_sys->psz_namecodec = psz_namecodec;
112 /* ***** Fill p_context with init values ***** */
113 p_sys->p_context->sample_rate = p_dec->fmt_in.audio.i_rate;
114 p_sys->p_context->channels = p_dec->fmt_in.audio.i_channels;
115 if( !p_dec->fmt_in.audio.i_physical_channels )
117 msg_Warn( p_dec, "Physical channel configuration not set : guessing" );
118 p_dec->fmt_in.audio.i_original_channels =
119 p_dec->fmt_in.audio.i_physical_channels =
120 pi_channels_maps[p_sys->p_context->channels];
123 p_dec->fmt_out.audio.i_physical_channels =
124 p_dec->fmt_out.audio.i_original_channels =
125 p_dec->fmt_in.audio.i_physical_channels;
127 p_sys->p_context->block_align = p_dec->fmt_in.audio.i_blockalign;
128 p_sys->p_context->bit_rate = p_dec->fmt_in.i_bitrate;
129 p_sys->p_context->bits_per_sample = p_dec->fmt_in.audio.i_bitspersample;
131 if( ( p_sys->p_context->extradata_size = p_dec->fmt_in.i_extra ) > 0 )
135 if( p_dec->fmt_in.i_codec == VLC_FOURCC( 'f', 'l', 'a', 'c' ) )
138 p_sys->p_context->extradata_size -= i_offset;
139 p_sys->p_context->extradata =
140 malloc( p_sys->p_context->extradata_size +
141 FF_INPUT_BUFFER_PADDING_SIZE );
142 memcpy( p_sys->p_context->extradata,
143 (char*)p_dec->fmt_in.p_extra + i_offset,
144 p_sys->p_context->extradata_size );
145 memset( (char*)p_sys->p_context->extradata +
146 p_sys->p_context->extradata_size, 0,
147 FF_INPUT_BUFFER_PADDING_SIZE );
150 p_sys->p_context->extradata = NULL;
152 /* ***** Open the codec ***** */
153 vlc_mutex_t *lock = var_AcquireMutex( "avcodec" );
156 free( p_sys->p_context->extradata );
161 if (avcodec_open( p_sys->p_context, p_sys->p_codec ) < 0)
163 vlc_mutex_unlock( lock );
164 msg_Err( p_dec, "cannot open codec (%s)", p_sys->psz_namecodec );
165 free( p_sys->p_context->extradata );
169 vlc_mutex_unlock( lock );
171 msg_Dbg( p_dec, "ffmpeg codec (%s) started", p_sys->psz_namecodec );
173 p_sys->p_output = malloc( AVCODEC_MAX_AUDIO_FRAME_SIZE );
174 p_sys->p_samples = NULL;
175 p_sys->i_samples = 0;
176 p_sys->i_reject_count = 0;
177 p_sys->i_input_rate = INPUT_RATE_DEFAULT;
179 aout_DateSet( &p_sys->end_date, 0 );
180 if( p_dec->fmt_in.audio.i_rate )
181 aout_DateInit( &p_sys->end_date, p_dec->fmt_in.audio.i_rate );
183 /* Set output properties */
184 p_dec->fmt_out.i_cat = AUDIO_ES;
185 p_dec->fmt_out.i_codec = AOUT_FMT_S16_NE;
186 p_dec->fmt_out.audio.i_bitspersample = 16;
191 /*****************************************************************************
192 * SplitBuffer: Needed because aout really doesn't like big audio chunk and
193 * wma produces easily > 30000 samples...
194 *****************************************************************************/
195 static aout_buffer_t *SplitBuffer( decoder_t *p_dec )
197 decoder_sys_t *p_sys = p_dec->p_sys;
198 int i_samples = __MIN( p_sys->i_samples, 4096 );
199 aout_buffer_t *p_buffer;
201 if( i_samples == 0 ) return NULL;
203 if( ( p_buffer = p_dec->pf_aout_buffer_new( p_dec, i_samples ) ) == NULL )
205 msg_Err( p_dec, "cannot get aout buffer" );
209 p_buffer->start_date = aout_DateGet( &p_sys->end_date );
210 p_buffer->end_date = aout_DateIncrement( &p_sys->end_date,
211 i_samples * p_sys->i_input_rate / INPUT_RATE_DEFAULT );
213 memcpy( p_buffer->p_buffer, p_sys->p_samples, p_buffer->i_nb_bytes );
215 p_sys->p_samples += p_buffer->i_nb_bytes;
216 p_sys->i_samples -= i_samples;
221 /*****************************************************************************
222 * DecodeAudio: Called to decode one frame
223 *****************************************************************************/
224 aout_buffer_t * DecodeAudio ( decoder_t *p_dec, block_t **pp_block )
226 decoder_sys_t *p_sys = p_dec->p_sys;
227 int i_used, i_output;
228 aout_buffer_t *p_buffer;
231 if( !pp_block || !*pp_block ) return NULL;
235 if( p_block->i_rate > 0 )
236 p_sys->i_input_rate = p_block->i_rate;
238 if( p_block->i_flags & (BLOCK_FLAG_DISCONTINUITY|BLOCK_FLAG_CORRUPTED) )
240 block_Release( p_block );
241 avcodec_flush_buffers( p_sys->p_context );
243 if( p_sys->i_codec_id == CODEC_ID_MP2 || p_sys->i_codec_id == CODEC_ID_MP3 )
244 p_sys->i_reject_count = 3;
248 if( p_sys->i_samples > 0 )
251 p_buffer = SplitBuffer( p_dec );
252 if( !p_buffer ) block_Release( p_block );
256 if( !aout_DateGet( &p_sys->end_date ) && !p_block->i_pts )
258 /* We've just started the stream, wait for the first PTS. */
259 block_Release( p_block );
263 if( p_block->i_buffer <= 0 )
265 block_Release( p_block );
268 if( p_block->i_buffer > AVCODEC_MAX_AUDIO_FRAME_SIZE )
270 /* Grow output buffer if necessary (eg. for PCM data) */
271 p_sys->p_output = realloc(p_sys->p_output, p_block->i_buffer);
274 *pp_block = p_block = block_Realloc( p_block, 0, p_block->i_buffer + FF_INPUT_BUFFER_PADDING_SIZE );
277 p_block->i_buffer -= FF_INPUT_BUFFER_PADDING_SIZE;
278 memset( &p_block->p_buffer[p_block->i_buffer], 0, FF_INPUT_BUFFER_PADDING_SIZE );
280 #if LIBAVCODEC_VERSION_INT >= ((52<<16)+(0<<8)+0)
281 i_output = __MAX( AVCODEC_MAX_AUDIO_FRAME_SIZE, p_block->i_buffer );
282 i_used = avcodec_decode_audio2( p_sys->p_context,
283 (int16_t*)p_sys->p_output, &i_output,
284 p_block->p_buffer, p_block->i_buffer );
286 i_used = avcodec_decode_audio( p_sys->p_context,
287 (int16_t*)p_sys->p_output, &i_output,
288 p_block->p_buffer, p_block->i_buffer );
291 if( i_used < 0 || i_output < 0 )
294 msg_Warn( p_dec, "cannot decode one frame (%d bytes)",
297 block_Release( p_block );
300 else if( (size_t)i_used > p_block->i_buffer )
302 i_used = p_block->i_buffer;
305 p_block->i_buffer -= i_used;
306 p_block->p_buffer += i_used;
308 if( p_sys->p_context->channels <= 0 || p_sys->p_context->channels > 6 )
310 msg_Warn( p_dec, "invalid channels count %d",
311 p_sys->p_context->channels );
312 block_Release( p_block );
316 if( p_dec->fmt_out.audio.i_rate != (unsigned int)p_sys->p_context->sample_rate )
318 aout_DateInit( &p_sys->end_date, p_sys->p_context->sample_rate );
319 aout_DateSet( &p_sys->end_date, p_block->i_pts );
322 /* **** Set audio output parameters **** */
323 p_dec->fmt_out.audio.i_rate = p_sys->p_context->sample_rate;
324 p_dec->fmt_out.audio.i_channels = p_sys->p_context->channels;
325 p_dec->fmt_out.audio.i_original_channels =
326 p_dec->fmt_out.audio.i_physical_channels =
327 pi_channels_maps[p_sys->p_context->channels];
329 if( p_block->i_pts != 0 &&
330 p_block->i_pts != aout_DateGet( &p_sys->end_date ) )
332 aout_DateSet( &p_sys->end_date, p_block->i_pts );
336 /* **** Now we can output these samples **** */
337 p_sys->i_samples = i_output / sizeof(int16_t) / p_sys->p_context->channels;
338 p_sys->p_samples = p_sys->p_output;
340 /* Silent unwanted samples */
341 if( p_sys->i_reject_count > 0 )
343 memset( p_sys->p_output, 0, i_output );
344 p_sys->i_reject_count--;
347 p_buffer = SplitBuffer( p_dec );
348 if( !p_buffer ) block_Release( p_block );
352 /*****************************************************************************
353 * EndAudioDec: audio decoder destruction
354 *****************************************************************************/
355 void EndAudioDec( decoder_t *p_dec )
357 decoder_sys_t *p_sys = p_dec->p_sys;
359 free( p_sys->p_output );