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 *****************************************************************************/
29 #include <vlc/decoder.h>
32 #ifdef HAVE_FFMPEG_AVCODEC_H
33 # include <ffmpeg/avcodec.h>
40 static unsigned int pi_channels_maps[7] =
43 AOUT_CHAN_CENTER, AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT,
44 AOUT_CHAN_CENTER | AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT,
45 AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_REARLEFT
46 | AOUT_CHAN_REARRIGHT,
47 AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
48 | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT,
49 AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
50 | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT | AOUT_CHAN_LFE
53 /*****************************************************************************
54 * decoder_sys_t : decoder descriptor
55 *****************************************************************************/
58 /* Common part between video and audio decoder */
61 const char *psz_namecodec;
62 AVCodecContext *p_context;
65 /* Temporary buffer for libavcodec */
71 audio_sample_format_t aout_format;
72 audio_date_t end_date;
81 /*****************************************************************************
82 * InitAudioDec: initialize audio decoder
83 *****************************************************************************
84 * The ffmpeg codec will be opened, some memory allocated.
85 *****************************************************************************/
86 int E_(InitAudioDec)( decoder_t *p_dec, AVCodecContext *p_context,
87 AVCodec *p_codec, int i_codec_id, const char *psz_namecodec )
92 var_Get( p_dec->p_libvlc_global, "avcodec", &lockval );
94 /* Allocate the memory needed to store the decoder's structure */
95 if( ( p_dec->p_sys = p_sys =
96 (decoder_sys_t *)malloc(sizeof(decoder_sys_t)) ) == NULL )
98 msg_Err( p_dec, "out of memory" );
102 p_sys->p_context = p_context;
103 p_sys->p_codec = p_codec;
104 p_sys->i_codec_id = i_codec_id;
105 p_sys->psz_namecodec = psz_namecodec;
107 /* ***** Fill p_context with init values ***** */
108 p_sys->p_context->sample_rate = p_dec->fmt_in.audio.i_rate;
109 p_sys->p_context->channels = p_dec->fmt_in.audio.i_channels;
110 p_sys->p_context->block_align = p_dec->fmt_in.audio.i_blockalign;
111 p_sys->p_context->bit_rate = p_dec->fmt_in.i_bitrate;
112 p_sys->p_context->bits_per_sample = p_dec->fmt_in.audio.i_bitspersample;
114 if( ( p_sys->p_context->extradata_size = p_dec->fmt_in.i_extra ) > 0 )
118 if( p_dec->fmt_in.i_codec == VLC_FOURCC( 'f', 'l', 'a', 'c' ) )
121 p_sys->p_context->extradata_size -= i_offset;
122 p_sys->p_context->extradata =
123 malloc( p_sys->p_context->extradata_size +
124 FF_INPUT_BUFFER_PADDING_SIZE );
125 memcpy( p_sys->p_context->extradata,
126 (char*)p_dec->fmt_in.p_extra + i_offset,
127 p_sys->p_context->extradata_size );
128 memset( (char*)p_sys->p_context->extradata +
129 p_sys->p_context->extradata_size, 0,
130 FF_INPUT_BUFFER_PADDING_SIZE );
133 /* ***** Open the codec ***** */
134 vlc_mutex_lock( lockval.p_address );
135 if (avcodec_open( p_sys->p_context, p_sys->p_codec ) < 0)
137 vlc_mutex_unlock( lockval.p_address );
138 msg_Err( p_dec, "cannot open codec (%s)", p_sys->psz_namecodec );
142 vlc_mutex_unlock( lockval.p_address );
144 msg_Dbg( p_dec, "ffmpeg codec (%s) started", p_sys->psz_namecodec );
146 p_sys->p_output = malloc( AVCODEC_MAX_AUDIO_FRAME_SIZE );
147 p_sys->p_samples = NULL;
148 p_sys->i_samples = 0;
150 if( p_dec->fmt_in.audio.i_rate )
152 aout_DateInit( &p_sys->end_date, p_dec->fmt_in.audio.i_rate );
153 aout_DateSet( &p_sys->end_date, 0 );
156 /* Set output properties */
157 p_dec->fmt_out.i_cat = AUDIO_ES;
158 p_dec->fmt_out.i_codec = AOUT_FMT_S16_NE;
159 p_dec->fmt_out.audio.i_bitspersample = 16;
164 /*****************************************************************************
165 * SplitBuffer: Needed because aout really doesn't like big audio chunk and
166 * wma produces easily > 30000 samples...
167 *****************************************************************************/
168 aout_buffer_t *SplitBuffer( decoder_t *p_dec )
170 decoder_sys_t *p_sys = p_dec->p_sys;
171 int i_samples = __MIN( p_sys->i_samples, 4096 );
172 aout_buffer_t *p_buffer;
174 if( i_samples == 0 ) return NULL;
176 if( ( p_buffer = p_dec->pf_aout_buffer_new( p_dec, i_samples ) ) == NULL )
178 msg_Err( p_dec, "cannot get aout buffer" );
182 p_buffer->start_date = aout_DateGet( &p_sys->end_date );
183 p_buffer->end_date = aout_DateIncrement( &p_sys->end_date, i_samples );
185 memcpy( p_buffer->p_buffer, p_sys->p_samples, p_buffer->i_nb_bytes );
187 p_sys->p_samples += p_buffer->i_nb_bytes;
188 p_sys->i_samples -= i_samples;
193 /*****************************************************************************
194 * DecodeAudio: Called to decode one frame
195 *****************************************************************************/
196 aout_buffer_t *E_( DecodeAudio )( decoder_t *p_dec, block_t **pp_block )
198 decoder_sys_t *p_sys = p_dec->p_sys;
199 int i_used, i_output;
200 aout_buffer_t *p_buffer;
203 if( !pp_block || !*pp_block ) return NULL;
207 if( p_block->i_buffer <= 0 && p_sys->i_samples > 0 )
210 p_buffer = SplitBuffer( p_dec );
211 if( !p_buffer ) block_Release( p_block );
215 if( !aout_DateGet( &p_sys->end_date ) && !p_block->i_pts )
217 /* We've just started the stream, wait for the first PTS. */
218 block_Release( p_block );
222 if( p_block->i_buffer <= 0 ||
223 (p_block->i_flags & (BLOCK_FLAG_DISCONTINUITY|BLOCK_FLAG_CORRUPTED)) )
225 block_Release( p_block );
229 if( p_block->i_buffer > AVCODEC_MAX_AUDIO_FRAME_SIZE )
231 /* Grow output buffer if necessary (eg. for PCM data) */
232 p_sys->p_output = realloc(p_sys->p_output, p_block->i_buffer);
235 i_used = avcodec_decode_audio( p_sys->p_context,
236 (int16_t*)p_sys->p_output, &i_output,
237 p_block->p_buffer, p_block->i_buffer );
239 if( i_used < 0 || i_output < 0 )
242 msg_Warn( p_dec, "cannot decode one frame (%d bytes)",
245 block_Release( p_block );
248 else if( i_used > p_block->i_buffer )
250 i_used = p_block->i_buffer;
253 p_block->i_buffer -= i_used;
254 p_block->p_buffer += i_used;
256 if( p_sys->p_context->channels <= 0 || p_sys->p_context->channels > 6 )
258 msg_Warn( p_dec, "invalid channels count %d",
259 p_sys->p_context->channels );
260 block_Release( p_block );
264 if( p_dec->fmt_out.audio.i_rate != (unsigned int)p_sys->p_context->sample_rate )
266 aout_DateInit( &p_sys->end_date, p_sys->p_context->sample_rate );
267 aout_DateSet( &p_sys->end_date, p_block->i_pts );
270 /* **** Set audio output parameters **** */
271 p_dec->fmt_out.audio.i_rate = p_sys->p_context->sample_rate;
272 p_dec->fmt_out.audio.i_channels = p_sys->p_context->channels;
273 p_dec->fmt_out.audio.i_original_channels =
274 p_dec->fmt_out.audio.i_physical_channels =
275 pi_channels_maps[p_sys->p_context->channels];
277 if( p_block->i_pts != 0 &&
278 p_block->i_pts != aout_DateGet( &p_sys->end_date ) )
280 aout_DateSet( &p_sys->end_date, p_block->i_pts );
284 /* **** Now we can output these samples **** */
285 p_sys->i_samples = i_output / 2 / p_sys->p_context->channels;
286 p_sys->p_samples = p_sys->p_output;
288 p_buffer = SplitBuffer( p_dec );
289 if( !p_buffer ) block_Release( p_block );
293 /*****************************************************************************
294 * EndAudioDec: audio decoder destruction
295 *****************************************************************************/
296 void E_(EndAudioDec)( decoder_t *p_dec )
298 decoder_sys_t *p_sys = p_dec->p_sys;
300 if( p_sys->p_output ) free( p_sys->p_output );