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>
46 static unsigned int pi_channels_maps[7] =
49 AOUT_CHAN_CENTER, AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT,
50 AOUT_CHAN_CENTER | AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT,
51 AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_REARLEFT
52 | AOUT_CHAN_REARRIGHT,
53 AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
54 | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT,
55 AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
56 | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT | AOUT_CHAN_LFE
59 /*****************************************************************************
60 * decoder_sys_t : decoder descriptor
61 *****************************************************************************/
66 /* Temporary buffer for libavcodec */
72 audio_sample_format_t aout_format;
73 audio_date_t end_date;
87 /*****************************************************************************
88 * InitAudioDec: initialize audio decoder
89 *****************************************************************************
90 * The ffmpeg codec will be opened, some memory allocated.
91 *****************************************************************************/
92 int E_(InitAudioDec)( decoder_t *p_dec, AVCodecContext *p_context,
93 AVCodec *p_codec, int i_codec_id, const char *psz_namecodec )
97 /* Allocate the memory needed to store the decoder's structure */
98 if( ( p_dec->p_sys = p_sys =
99 (decoder_sys_t *)malloc(sizeof(decoder_sys_t)) ) == NULL )
101 msg_Err( p_dec, "out of memory" );
105 p_sys->p_context = p_context;
106 p_sys->p_codec = p_codec;
107 p_sys->i_codec_id = i_codec_id;
108 p_sys->psz_namecodec = psz_namecodec;
110 /* ***** Fill p_context with init values ***** */
111 p_sys->p_context->sample_rate = p_dec->fmt_in.audio.i_rate;
112 p_sys->p_context->channels = p_dec->fmt_in.audio.i_channels;
113 p_sys->p_context->block_align = p_dec->fmt_in.audio.i_blockalign;
114 p_sys->p_context->bit_rate = p_dec->fmt_in.i_bitrate;
115 p_sys->p_context->bits_per_sample = p_dec->fmt_in.audio.i_bitspersample;
117 if( ( p_sys->p_context->extradata_size = p_dec->fmt_in.i_extra ) > 0 )
121 if( p_dec->fmt_in.i_codec == VLC_FOURCC( 'f', 'l', 'a', 'c' ) )
124 p_sys->p_context->extradata_size -= i_offset;
125 p_sys->p_context->extradata =
126 malloc( p_sys->p_context->extradata_size +
127 FF_INPUT_BUFFER_PADDING_SIZE );
128 memcpy( p_sys->p_context->extradata,
129 (char*)p_dec->fmt_in.p_extra + i_offset,
130 p_sys->p_context->extradata_size );
131 memset( (char*)p_sys->p_context->extradata +
132 p_sys->p_context->extradata_size, 0,
133 FF_INPUT_BUFFER_PADDING_SIZE );
136 p_sys->p_context->extradata = NULL;
138 /* ***** Open the codec ***** */
139 vlc_mutex_t *lock = var_AcquireMutex( "avcodec" );
142 free( p_sys->p_context->extradata );
147 if (avcodec_open( p_sys->p_context, p_sys->p_codec ) < 0)
149 vlc_mutex_unlock( lock );
150 msg_Err( p_dec, "cannot open codec (%s)", p_sys->psz_namecodec );
151 free( p_sys->p_context->extradata );
155 vlc_mutex_unlock( lock );
157 msg_Dbg( p_dec, "ffmpeg codec (%s) started", p_sys->psz_namecodec );
159 p_sys->p_output = malloc( AVCODEC_MAX_AUDIO_FRAME_SIZE );
160 p_sys->p_samples = NULL;
161 p_sys->i_samples = 0;
162 p_sys->i_reject_count = 0;
163 p_sys->i_input_rate = INPUT_RATE_DEFAULT;
165 aout_DateSet( &p_sys->end_date, 0 );
166 if( p_dec->fmt_in.audio.i_rate )
167 aout_DateInit( &p_sys->end_date, p_dec->fmt_in.audio.i_rate );
169 /* Set output properties */
170 p_dec->fmt_out.i_cat = AUDIO_ES;
171 p_dec->fmt_out.i_codec = AOUT_FMT_S16_NE;
172 p_dec->fmt_out.audio.i_bitspersample = 16;
177 /*****************************************************************************
178 * SplitBuffer: Needed because aout really doesn't like big audio chunk and
179 * wma produces easily > 30000 samples...
180 *****************************************************************************/
181 static aout_buffer_t *SplitBuffer( decoder_t *p_dec )
183 decoder_sys_t *p_sys = p_dec->p_sys;
184 int i_samples = __MIN( p_sys->i_samples, 4096 );
185 aout_buffer_t *p_buffer;
187 if( i_samples == 0 ) return NULL;
189 if( ( p_buffer = p_dec->pf_aout_buffer_new( p_dec, i_samples ) ) == NULL )
191 msg_Err( p_dec, "cannot get aout buffer" );
195 p_buffer->start_date = aout_DateGet( &p_sys->end_date );
196 p_buffer->end_date = aout_DateIncrement( &p_sys->end_date,
197 i_samples * p_sys->i_input_rate / INPUT_RATE_DEFAULT );
199 memcpy( p_buffer->p_buffer, p_sys->p_samples, p_buffer->i_nb_bytes );
201 p_sys->p_samples += p_buffer->i_nb_bytes;
202 p_sys->i_samples -= i_samples;
207 /*****************************************************************************
208 * DecodeAudio: Called to decode one frame
209 *****************************************************************************/
210 aout_buffer_t *E_( DecodeAudio )( decoder_t *p_dec, block_t **pp_block )
212 decoder_sys_t *p_sys = p_dec->p_sys;
213 int i_used, i_output;
214 aout_buffer_t *p_buffer;
217 if( !pp_block || !*pp_block ) return NULL;
221 if( p_block->i_rate > 0 )
222 p_sys->i_input_rate = p_block->i_rate;
224 if( p_block->i_flags & (BLOCK_FLAG_DISCONTINUITY|BLOCK_FLAG_CORRUPTED) )
226 block_Release( p_block );
227 avcodec_flush_buffers( p_sys->p_context );
229 if( p_sys->i_codec_id == CODEC_ID_MP2 || p_sys->i_codec_id == CODEC_ID_MP3 )
230 p_sys->i_reject_count = 3;
234 if( p_sys->i_samples > 0 )
237 p_buffer = SplitBuffer( p_dec );
238 if( !p_buffer ) block_Release( p_block );
242 if( !aout_DateGet( &p_sys->end_date ) && !p_block->i_pts )
244 /* We've just started the stream, wait for the first PTS. */
245 block_Release( p_block );
249 if( p_block->i_buffer <= 0 )
251 block_Release( p_block );
254 if( p_block->i_buffer > AVCODEC_MAX_AUDIO_FRAME_SIZE )
256 /* Grow output buffer if necessary (eg. for PCM data) */
257 p_sys->p_output = realloc(p_sys->p_output, p_block->i_buffer);
260 *pp_block = p_block = block_Realloc( p_block, 0, p_block->i_buffer + FF_INPUT_BUFFER_PADDING_SIZE );
263 p_block->i_buffer -= FF_INPUT_BUFFER_PADDING_SIZE;
264 memset( &p_block->p_buffer[p_block->i_buffer], 0, FF_INPUT_BUFFER_PADDING_SIZE );
266 #if LIBAVCODEC_VERSION_INT >= ((52<<16)+(0<<8)+0)
267 i_output = __MAX( AVCODEC_MAX_AUDIO_FRAME_SIZE, p_block->i_buffer );
268 i_used = avcodec_decode_audio2( p_sys->p_context,
269 (int16_t*)p_sys->p_output, &i_output,
270 p_block->p_buffer, p_block->i_buffer );
272 i_used = avcodec_decode_audio( p_sys->p_context,
273 (int16_t*)p_sys->p_output, &i_output,
274 p_block->p_buffer, p_block->i_buffer );
277 if( i_used < 0 || i_output < 0 )
280 msg_Warn( p_dec, "cannot decode one frame (%d bytes)",
283 block_Release( p_block );
286 else if( (size_t)i_used > p_block->i_buffer )
288 i_used = p_block->i_buffer;
291 p_block->i_buffer -= i_used;
292 p_block->p_buffer += i_used;
294 if( p_sys->p_context->channels <= 0 || p_sys->p_context->channels > 6 )
296 msg_Warn( p_dec, "invalid channels count %d",
297 p_sys->p_context->channels );
298 block_Release( p_block );
302 if( p_dec->fmt_out.audio.i_rate != (unsigned int)p_sys->p_context->sample_rate )
304 aout_DateInit( &p_sys->end_date, p_sys->p_context->sample_rate );
305 aout_DateSet( &p_sys->end_date, p_block->i_pts );
308 /* **** Set audio output parameters **** */
309 p_dec->fmt_out.audio.i_rate = p_sys->p_context->sample_rate;
310 p_dec->fmt_out.audio.i_channels = p_sys->p_context->channels;
311 p_dec->fmt_out.audio.i_original_channels =
312 p_dec->fmt_out.audio.i_physical_channels =
313 pi_channels_maps[p_sys->p_context->channels];
315 if( p_block->i_pts != 0 &&
316 p_block->i_pts != aout_DateGet( &p_sys->end_date ) )
318 aout_DateSet( &p_sys->end_date, p_block->i_pts );
322 /* **** Now we can output these samples **** */
323 p_sys->i_samples = i_output / sizeof(int16_t) / p_sys->p_context->channels;
324 p_sys->p_samples = p_sys->p_output;
326 /* Silent unwanted samples */
327 if( p_sys->i_reject_count > 0 )
329 memset( p_sys->p_output, 0, i_output );
330 p_sys->i_reject_count--;
333 p_buffer = SplitBuffer( p_dec );
334 if( !p_buffer ) block_Release( p_block );
338 /*****************************************************************************
339 * EndAudioDec: audio decoder destruction
340 *****************************************************************************/
341 void E_(EndAudioDec)( decoder_t *p_dec )
343 decoder_sys_t *p_sys = p_dec->p_sys;
345 if( p_sys->p_output ) free( p_sys->p_output );