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 *****************************************************************************/
30 #include <vlc_codec.h>
31 #include <vlc_input.h>
34 #ifdef HAVE_FFMPEG_AVCODEC_H
35 # include <ffmpeg/avcodec.h>
42 static unsigned int pi_channels_maps[7] =
45 AOUT_CHAN_CENTER, AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT,
46 AOUT_CHAN_CENTER | AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT,
47 AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_REARLEFT
48 | AOUT_CHAN_REARRIGHT,
49 AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
50 | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT,
51 AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
52 | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT | AOUT_CHAN_LFE
55 /*****************************************************************************
56 * decoder_sys_t : decoder descriptor
57 *****************************************************************************/
62 /* Temporary buffer for libavcodec */
68 audio_sample_format_t aout_format;
69 audio_date_t end_date;
83 /*****************************************************************************
84 * InitAudioDec: initialize audio decoder
85 *****************************************************************************
86 * The ffmpeg codec will be opened, some memory allocated.
87 *****************************************************************************/
88 int E_(InitAudioDec)( decoder_t *p_dec, AVCodecContext *p_context,
89 AVCodec *p_codec, int i_codec_id, const char *psz_namecodec )
93 /* Allocate the memory needed to store the decoder's structure */
94 if( ( p_dec->p_sys = p_sys =
95 (decoder_sys_t *)malloc(sizeof(decoder_sys_t)) ) == NULL )
97 msg_Err( p_dec, "out of memory" );
101 p_sys->p_context = p_context;
102 p_sys->p_codec = p_codec;
103 p_sys->i_codec_id = i_codec_id;
104 p_sys->psz_namecodec = psz_namecodec;
106 /* ***** Fill p_context with init values ***** */
107 p_sys->p_context->sample_rate = p_dec->fmt_in.audio.i_rate;
108 p_sys->p_context->channels = p_dec->fmt_in.audio.i_channels;
109 p_sys->p_context->block_align = p_dec->fmt_in.audio.i_blockalign;
110 p_sys->p_context->bit_rate = p_dec->fmt_in.i_bitrate;
111 p_sys->p_context->bits_per_sample = p_dec->fmt_in.audio.i_bitspersample;
113 if( ( p_sys->p_context->extradata_size = p_dec->fmt_in.i_extra ) > 0 )
117 if( p_dec->fmt_in.i_codec == VLC_FOURCC( 'f', 'l', 'a', 'c' ) )
120 p_sys->p_context->extradata_size -= i_offset;
121 p_sys->p_context->extradata =
122 malloc( p_sys->p_context->extradata_size +
123 FF_INPUT_BUFFER_PADDING_SIZE );
124 memcpy( p_sys->p_context->extradata,
125 (char*)p_dec->fmt_in.p_extra + i_offset,
126 p_sys->p_context->extradata_size );
127 memset( (char*)p_sys->p_context->extradata +
128 p_sys->p_context->extradata_size, 0,
129 FF_INPUT_BUFFER_PADDING_SIZE );
132 p_sys->p_context->extradata = NULL;
134 /* ***** Open the codec ***** */
135 vlc_mutex_t *lock = var_AcquireMutex( "avcodec" );
138 free( p_sys->p_context->extradata );
143 if (avcodec_open( p_sys->p_context, p_sys->p_codec ) < 0)
145 vlc_mutex_unlock( lock );
146 msg_Err( p_dec, "cannot open codec (%s)", p_sys->psz_namecodec );
147 free( p_sys->p_context->extradata );
151 vlc_mutex_unlock( lock );
153 msg_Dbg( p_dec, "ffmpeg codec (%s) started", p_sys->psz_namecodec );
155 p_sys->p_output = malloc( AVCODEC_MAX_AUDIO_FRAME_SIZE );
156 p_sys->p_samples = NULL;
157 p_sys->i_samples = 0;
158 p_sys->i_reject_count = 0;
159 p_sys->i_input_rate = INPUT_RATE_DEFAULT;
161 aout_DateSet( &p_sys->end_date, 0 );
162 if( p_dec->fmt_in.audio.i_rate )
163 aout_DateInit( &p_sys->end_date, p_dec->fmt_in.audio.i_rate );
165 /* Set output properties */
166 p_dec->fmt_out.i_cat = AUDIO_ES;
167 p_dec->fmt_out.i_codec = AOUT_FMT_S16_NE;
168 p_dec->fmt_out.audio.i_bitspersample = 16;
173 /*****************************************************************************
174 * SplitBuffer: Needed because aout really doesn't like big audio chunk and
175 * wma produces easily > 30000 samples...
176 *****************************************************************************/
177 static aout_buffer_t *SplitBuffer( decoder_t *p_dec )
179 decoder_sys_t *p_sys = p_dec->p_sys;
180 int i_samples = __MIN( p_sys->i_samples, 4096 );
181 aout_buffer_t *p_buffer;
183 if( i_samples == 0 ) return NULL;
185 if( ( p_buffer = p_dec->pf_aout_buffer_new( p_dec, i_samples ) ) == NULL )
187 msg_Err( p_dec, "cannot get aout buffer" );
191 p_buffer->start_date = aout_DateGet( &p_sys->end_date );
192 p_buffer->end_date = aout_DateIncrement( &p_sys->end_date,
193 i_samples * p_sys->i_input_rate / INPUT_RATE_DEFAULT );
195 memcpy( p_buffer->p_buffer, p_sys->p_samples, p_buffer->i_nb_bytes );
197 p_sys->p_samples += p_buffer->i_nb_bytes;
198 p_sys->i_samples -= i_samples;
203 /*****************************************************************************
204 * DecodeAudio: Called to decode one frame
205 *****************************************************************************/
206 aout_buffer_t *E_( DecodeAudio )( decoder_t *p_dec, block_t **pp_block )
208 decoder_sys_t *p_sys = p_dec->p_sys;
209 int i_used, i_output;
210 aout_buffer_t *p_buffer;
213 if( !pp_block || !*pp_block ) return NULL;
217 if( p_block->i_rate > 0 )
218 p_sys->i_input_rate = p_block->i_rate;
220 if( p_block->i_flags & (BLOCK_FLAG_DISCONTINUITY|BLOCK_FLAG_CORRUPTED) )
222 block_Release( p_block );
223 avcodec_flush_buffers( p_sys->p_context );
225 if( p_sys->i_codec_id == CODEC_ID_MP2 || p_sys->i_codec_id == CODEC_ID_MP3 )
226 p_sys->i_reject_count = 3;
230 if( p_sys->i_samples > 0 )
233 p_buffer = SplitBuffer( p_dec );
234 if( !p_buffer ) block_Release( p_block );
238 if( !aout_DateGet( &p_sys->end_date ) && !p_block->i_pts )
240 /* We've just started the stream, wait for the first PTS. */
241 block_Release( p_block );
245 if( p_block->i_buffer <= 0 )
247 block_Release( p_block );
250 if( p_block->i_buffer > AVCODEC_MAX_AUDIO_FRAME_SIZE )
252 /* Grow output buffer if necessary (eg. for PCM data) */
253 p_sys->p_output = realloc(p_sys->p_output, p_block->i_buffer);
256 *pp_block = p_block = block_Realloc( p_block, 0, p_block->i_buffer + FF_INPUT_BUFFER_PADDING_SIZE );
259 p_block->i_buffer -= FF_INPUT_BUFFER_PADDING_SIZE;
260 memset( &p_block->p_buffer[p_block->i_buffer], 0, FF_INPUT_BUFFER_PADDING_SIZE );
262 #if LIBAVCODEC_VERSION_INT >= ((52<<16)+(0<<8)+0)
263 i_output = __MAX( AVCODEC_MAX_AUDIO_FRAME_SIZE, p_block->i_buffer );
264 i_used = avcodec_decode_audio2( p_sys->p_context,
265 (int16_t*)p_sys->p_output, &i_output,
266 p_block->p_buffer, p_block->i_buffer );
268 i_used = avcodec_decode_audio( p_sys->p_context,
269 (int16_t*)p_sys->p_output, &i_output,
270 p_block->p_buffer, p_block->i_buffer );
273 if( i_used < 0 || i_output < 0 )
276 msg_Warn( p_dec, "cannot decode one frame (%d bytes)",
279 block_Release( p_block );
282 else if( i_used > p_block->i_buffer )
284 i_used = p_block->i_buffer;
287 p_block->i_buffer -= i_used;
288 p_block->p_buffer += i_used;
290 if( p_sys->p_context->channels <= 0 || p_sys->p_context->channels > 6 )
292 msg_Warn( p_dec, "invalid channels count %d",
293 p_sys->p_context->channels );
294 block_Release( p_block );
298 if( p_dec->fmt_out.audio.i_rate != (unsigned int)p_sys->p_context->sample_rate )
300 aout_DateInit( &p_sys->end_date, p_sys->p_context->sample_rate );
301 aout_DateSet( &p_sys->end_date, p_block->i_pts );
304 /* **** Set audio output parameters **** */
305 p_dec->fmt_out.audio.i_rate = p_sys->p_context->sample_rate;
306 p_dec->fmt_out.audio.i_channels = p_sys->p_context->channels;
307 p_dec->fmt_out.audio.i_original_channels =
308 p_dec->fmt_out.audio.i_physical_channels =
309 pi_channels_maps[p_sys->p_context->channels];
311 if( p_block->i_pts != 0 &&
312 p_block->i_pts != aout_DateGet( &p_sys->end_date ) )
314 aout_DateSet( &p_sys->end_date, p_block->i_pts );
318 /* **** Now we can output these samples **** */
319 p_sys->i_samples = i_output / sizeof(int16_t) / p_sys->p_context->channels;
320 p_sys->p_samples = p_sys->p_output;
322 /* Silent unwanted samples */
323 if( p_sys->i_reject_count > 0 )
325 memset( p_sys->p_output, 0, i_output );
326 p_sys->i_reject_count--;
329 p_buffer = SplitBuffer( p_dec );
330 if( !p_buffer ) block_Release( p_block );
334 /*****************************************************************************
335 * EndAudioDec: audio decoder destruction
336 *****************************************************************************/
337 void E_(EndAudioDec)( decoder_t *p_dec )
339 decoder_sys_t *p_sys = p_dec->p_sys;
341 if( p_sys->p_output ) free( p_sys->p_output );