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 E_(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 p_sys->p_context->block_align = p_dec->fmt_in.audio.i_blockalign;
116 p_sys->p_context->bit_rate = p_dec->fmt_in.i_bitrate;
117 p_sys->p_context->bits_per_sample = p_dec->fmt_in.audio.i_bitspersample;
119 if( ( p_sys->p_context->extradata_size = p_dec->fmt_in.i_extra ) > 0 )
123 if( p_dec->fmt_in.i_codec == VLC_FOURCC( 'f', 'l', 'a', 'c' ) )
126 p_sys->p_context->extradata_size -= i_offset;
127 p_sys->p_context->extradata =
128 malloc( p_sys->p_context->extradata_size +
129 FF_INPUT_BUFFER_PADDING_SIZE );
130 memcpy( p_sys->p_context->extradata,
131 (char*)p_dec->fmt_in.p_extra + i_offset,
132 p_sys->p_context->extradata_size );
133 memset( (char*)p_sys->p_context->extradata +
134 p_sys->p_context->extradata_size, 0,
135 FF_INPUT_BUFFER_PADDING_SIZE );
138 p_sys->p_context->extradata = NULL;
140 /* ***** Open the codec ***** */
141 vlc_mutex_t *lock = var_AcquireMutex( "avcodec" );
144 free( p_sys->p_context->extradata );
149 if (avcodec_open( p_sys->p_context, p_sys->p_codec ) < 0)
151 vlc_mutex_unlock( lock );
152 msg_Err( p_dec, "cannot open codec (%s)", p_sys->psz_namecodec );
153 free( p_sys->p_context->extradata );
157 vlc_mutex_unlock( lock );
159 msg_Dbg( p_dec, "ffmpeg codec (%s) started", p_sys->psz_namecodec );
161 p_sys->p_output = malloc( AVCODEC_MAX_AUDIO_FRAME_SIZE );
162 p_sys->p_samples = NULL;
163 p_sys->i_samples = 0;
164 p_sys->i_reject_count = 0;
165 p_sys->i_input_rate = INPUT_RATE_DEFAULT;
167 aout_DateSet( &p_sys->end_date, 0 );
168 if( p_dec->fmt_in.audio.i_rate )
169 aout_DateInit( &p_sys->end_date, p_dec->fmt_in.audio.i_rate );
171 /* Set output properties */
172 p_dec->fmt_out.i_cat = AUDIO_ES;
173 p_dec->fmt_out.i_codec = AOUT_FMT_S16_NE;
174 p_dec->fmt_out.audio.i_bitspersample = 16;
179 /*****************************************************************************
180 * SplitBuffer: Needed because aout really doesn't like big audio chunk and
181 * wma produces easily > 30000 samples...
182 *****************************************************************************/
183 static aout_buffer_t *SplitBuffer( decoder_t *p_dec )
185 decoder_sys_t *p_sys = p_dec->p_sys;
186 int i_samples = __MIN( p_sys->i_samples, 4096 );
187 aout_buffer_t *p_buffer;
189 if( i_samples == 0 ) return NULL;
191 if( ( p_buffer = p_dec->pf_aout_buffer_new( p_dec, i_samples ) ) == NULL )
193 msg_Err( p_dec, "cannot get aout buffer" );
197 p_buffer->start_date = aout_DateGet( &p_sys->end_date );
198 p_buffer->end_date = aout_DateIncrement( &p_sys->end_date,
199 i_samples * p_sys->i_input_rate / INPUT_RATE_DEFAULT );
201 memcpy( p_buffer->p_buffer, p_sys->p_samples, p_buffer->i_nb_bytes );
203 p_sys->p_samples += p_buffer->i_nb_bytes;
204 p_sys->i_samples -= i_samples;
209 /*****************************************************************************
210 * DecodeAudio: Called to decode one frame
211 *****************************************************************************/
212 aout_buffer_t *E_( DecodeAudio )( decoder_t *p_dec, block_t **pp_block )
214 decoder_sys_t *p_sys = p_dec->p_sys;
215 int i_used, i_output;
216 aout_buffer_t *p_buffer;
219 if( !pp_block || !*pp_block ) return NULL;
223 if( p_block->i_rate > 0 )
224 p_sys->i_input_rate = p_block->i_rate;
226 if( p_block->i_flags & (BLOCK_FLAG_DISCONTINUITY|BLOCK_FLAG_CORRUPTED) )
228 block_Release( p_block );
229 avcodec_flush_buffers( p_sys->p_context );
231 if( p_sys->i_codec_id == CODEC_ID_MP2 || p_sys->i_codec_id == CODEC_ID_MP3 )
232 p_sys->i_reject_count = 3;
236 if( p_sys->i_samples > 0 )
239 p_buffer = SplitBuffer( p_dec );
240 if( !p_buffer ) block_Release( p_block );
244 if( !aout_DateGet( &p_sys->end_date ) && !p_block->i_pts )
246 /* We've just started the stream, wait for the first PTS. */
247 block_Release( p_block );
251 if( p_block->i_buffer <= 0 )
253 block_Release( p_block );
256 if( p_block->i_buffer > AVCODEC_MAX_AUDIO_FRAME_SIZE )
258 /* Grow output buffer if necessary (eg. for PCM data) */
259 p_sys->p_output = realloc(p_sys->p_output, p_block->i_buffer);
262 *pp_block = p_block = block_Realloc( p_block, 0, p_block->i_buffer + FF_INPUT_BUFFER_PADDING_SIZE );
265 p_block->i_buffer -= FF_INPUT_BUFFER_PADDING_SIZE;
266 memset( &p_block->p_buffer[p_block->i_buffer], 0, FF_INPUT_BUFFER_PADDING_SIZE );
268 #if LIBAVCODEC_VERSION_INT >= ((52<<16)+(0<<8)+0)
269 i_output = __MAX( AVCODEC_MAX_AUDIO_FRAME_SIZE, p_block->i_buffer );
270 i_used = avcodec_decode_audio2( p_sys->p_context,
271 (int16_t*)p_sys->p_output, &i_output,
272 p_block->p_buffer, p_block->i_buffer );
274 i_used = avcodec_decode_audio( p_sys->p_context,
275 (int16_t*)p_sys->p_output, &i_output,
276 p_block->p_buffer, p_block->i_buffer );
279 if( i_used < 0 || i_output < 0 )
282 msg_Warn( p_dec, "cannot decode one frame (%d bytes)",
285 block_Release( p_block );
288 else if( (size_t)i_used > p_block->i_buffer )
290 i_used = p_block->i_buffer;
293 p_block->i_buffer -= i_used;
294 p_block->p_buffer += i_used;
296 if( p_sys->p_context->channels <= 0 || p_sys->p_context->channels > 6 )
298 msg_Warn( p_dec, "invalid channels count %d",
299 p_sys->p_context->channels );
300 block_Release( p_block );
304 if( p_dec->fmt_out.audio.i_rate != (unsigned int)p_sys->p_context->sample_rate )
306 aout_DateInit( &p_sys->end_date, p_sys->p_context->sample_rate );
307 aout_DateSet( &p_sys->end_date, p_block->i_pts );
310 /* **** Set audio output parameters **** */
311 p_dec->fmt_out.audio.i_rate = p_sys->p_context->sample_rate;
312 p_dec->fmt_out.audio.i_channels = p_sys->p_context->channels;
313 p_dec->fmt_out.audio.i_original_channels =
314 p_dec->fmt_out.audio.i_physical_channels =
315 pi_channels_maps[p_sys->p_context->channels];
317 if( p_block->i_pts != 0 &&
318 p_block->i_pts != aout_DateGet( &p_sys->end_date ) )
320 aout_DateSet( &p_sys->end_date, p_block->i_pts );
324 /* **** Now we can output these samples **** */
325 p_sys->i_samples = i_output / sizeof(int16_t) / p_sys->p_context->channels;
326 p_sys->p_samples = p_sys->p_output;
328 /* Silent unwanted samples */
329 if( p_sys->i_reject_count > 0 )
331 memset( p_sys->p_output, 0, i_output );
332 p_sys->i_reject_count--;
335 p_buffer = SplitBuffer( p_dec );
336 if( !p_buffer ) block_Release( p_block );
340 /*****************************************************************************
341 * EndAudioDec: audio decoder destruction
342 *****************************************************************************/
343 void E_(EndAudioDec)( decoder_t *p_dec )
345 decoder_sys_t *p_sys = p_dec->p_sys;
347 free( p_sys->p_output );