1 /*****************************************************************************
2 * decoder.c: AAC decoder using libfaad2
3 *****************************************************************************
4 * Copyright (C) 2001, 2003 VideoLAN
5 * $Id: faad.c,v 1.9 2004/01/25 18:20:12 bigben Exp $
7 * Authors: Laurent Aimar <fenrir@via.ecp.fr>
8 * Gildas Bazin <gbazin@netcourrier.com>
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., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
23 *****************************************************************************/
27 #include <vlc/decoder.h>
31 /*****************************************************************************
33 *****************************************************************************/
34 static int Open( vlc_object_t * );
35 static void Close( vlc_object_t * );
38 set_description( _("AAC audio decoder (using libfaad2)") );
39 set_capability( "decoder", 100 );
40 set_callbacks( Open, Close );
43 /****************************************************************************
45 ****************************************************************************/
46 static aout_buffer_t *DecodeBlock( decoder_t *, block_t ** );
47 static void DoReordering( decoder_t *, uint32_t *, uint32_t *, int, int,
50 #define MAX_CHANNEL_POSITIONS 9
60 /* temporary buffer */
65 /* Channel positions of the current stream (for re-ordering) */
66 uint32_t pi_channel_positions[MAX_CHANNEL_POSITIONS];
69 static const uint32_t pi_channels_in[MAX_CHANNEL_POSITIONS] =
70 { FRONT_CHANNEL_CENTER, FRONT_CHANNEL_LEFT, FRONT_CHANNEL_RIGHT,
71 SIDE_CHANNEL_LEFT, SIDE_CHANNEL_RIGHT,
72 BACK_CHANNEL_LEFT, BACK_CHANNEL_RIGHT,
73 BACK_CHANNEL_CENTER, LFE_CHANNEL };
74 static const uint32_t pi_channels_out[MAX_CHANNEL_POSITIONS] =
75 { AOUT_CHAN_CENTER, AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT,
76 AOUT_CHAN_MIDDLELEFT, AOUT_CHAN_MIDDLERIGHT,
77 AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT,
78 AOUT_CHAN_REARCENTER, AOUT_CHAN_LFE };
79 static const uint32_t pi_channels_ordered[MAX_CHANNEL_POSITIONS] =
80 { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT,
81 AOUT_CHAN_MIDDLELEFT, AOUT_CHAN_MIDDLERIGHT,
82 AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT,
83 AOUT_CHAN_CENTER, AOUT_CHAN_REARCENTER, AOUT_CHAN_LFE
86 /*****************************************************************************
87 * OpenDecoder: probe the decoder and return score
88 *****************************************************************************/
89 static int Open( vlc_object_t *p_this )
91 decoder_t *p_dec = (decoder_t*)p_this;
92 decoder_sys_t *p_sys = p_dec->p_sys;
93 faacDecConfiguration *cfg;
95 if( p_dec->fmt_in.i_codec != VLC_FOURCC('m','p','4','a') )
100 /* Allocate the memory needed to store the decoder's structure */
101 if( ( p_dec->p_sys = p_sys =
102 (decoder_sys_t *)malloc(sizeof(decoder_sys_t)) ) == NULL )
104 msg_Err( p_dec, "out of memory" );
108 /* Open a faad context */
109 if( ( p_sys->hfaad = faacDecOpen() ) == NULL )
111 msg_Err( p_dec, "cannot initialize faad" );
116 aout_DateSet( &p_sys->date, 0 );
117 p_dec->fmt_out.i_cat = AUDIO_ES;
118 p_dec->fmt_out.i_codec = VLC_FOURCC('f','l','3','2');
119 p_dec->pf_decode_audio = DecodeBlock;
121 p_dec->fmt_out.audio.i_physical_channels =
122 p_dec->fmt_out.audio.i_original_channels = 0;
124 if( p_dec->fmt_in.i_extra > 0 )
126 /* We have a decoder config so init the handle */
127 unsigned long i_rate;
128 unsigned char i_channels;
130 if( faacDecInit2( p_sys->hfaad, p_dec->fmt_in.p_extra,
131 p_dec->fmt_in.i_extra,
132 &i_rate, &i_channels ) < 0 )
137 p_dec->fmt_out.audio.i_rate = i_rate;
138 p_dec->fmt_out.audio.i_channels = i_channels;
139 aout_DateInit( &p_sys->date, i_rate );
143 /* Will be initalised from first frame */
144 p_dec->fmt_out.audio.i_rate = 0;
145 p_dec->fmt_out.audio.i_channels = 0;
148 /* Set the faad config */
149 cfg = faacDecGetCurrentConfiguration( p_sys->hfaad );
150 cfg->outputFormat = FAAD_FMT_FLOAT;
151 faacDecSetConfiguration( p_sys->hfaad, cfg );
154 p_sys->i_buffer = p_sys->i_buffer_size = 0;
160 /*****************************************************************************
162 *****************************************************************************/
163 static aout_buffer_t *DecodeBlock( decoder_t *p_dec, block_t **pp_block )
165 decoder_sys_t *p_sys = p_dec->p_sys;
168 if( !pp_block || !*pp_block ) return NULL;
172 if( p_block->b_discontinuity )
174 block_Release( p_block );
178 /* Append the block to the temporary buffer */
179 if( p_sys->i_buffer_size < p_sys->i_buffer + p_block->i_buffer )
181 p_sys->i_buffer_size = p_sys->i_buffer + p_block->i_buffer;
182 p_sys->p_buffer = realloc( p_sys->p_buffer, p_sys->i_buffer_size );
185 if( p_block->i_buffer )
187 memcpy( &p_sys->p_buffer[p_sys->i_buffer],
188 p_block->p_buffer, p_block->i_buffer );
189 p_sys->i_buffer += p_block->i_buffer;
190 p_block->i_buffer = 0;
193 if( p_dec->fmt_out.audio.i_rate == 0 && p_sys->i_buffer )
195 unsigned long i_rate;
196 unsigned char i_channels;
198 /* Init faad with the first frame */
199 if( faacDecInit( p_sys->hfaad,
200 p_sys->p_buffer, p_sys->i_buffer,
201 &i_rate, &i_channels ) < 0 )
203 block_Release( p_block );
207 p_dec->fmt_out.audio.i_rate = i_rate;
208 p_dec->fmt_out.audio.i_channels = i_channels;
209 aout_DateInit( &p_sys->date, i_rate );
212 if( p_block->i_pts != 0 && p_block->i_pts != aout_DateGet( &p_sys->date ) )
214 aout_DateSet( &p_sys->date, p_block->i_pts );
216 else if( !aout_DateGet( &p_sys->date ) )
218 /* We've just started the stream, wait for the first PTS. */
219 block_Release( p_block );
224 /* Decode all data */
225 if( p_sys->i_buffer )
228 faacDecFrameInfo frame;
229 aout_buffer_t *p_out;
232 samples = faacDecDecode( p_sys->hfaad, &frame,
233 p_sys->p_buffer, p_sys->i_buffer );
235 if( frame.error > 0 )
237 msg_Warn( p_dec, "%s", faacDecGetErrorMessage( frame.error ) );
239 /* Flush the buffer */
241 block_Release( p_block );
245 if( frame.channels <= 0 || frame.channels > 8 || frame.channels == 7 )
247 msg_Warn( p_dec, "invalid channels count: %i", frame.channels );
249 /* Flush the buffer */
250 p_sys->i_buffer -= frame.bytesconsumed;
251 if( p_sys->i_buffer > 0 )
253 memmove( p_sys->p_buffer,&p_sys->p_buffer[frame.bytesconsumed],
256 block_Release( p_block );
260 if( frame.samples <= 0 )
262 msg_Warn( p_dec, "decoded zero sample" );
264 /* Flush the buffer */
265 p_sys->i_buffer -= frame.bytesconsumed;
266 if( p_sys->i_buffer > 0 )
268 memmove( p_sys->p_buffer,&p_sys->p_buffer[frame.bytesconsumed],
271 block_Release( p_block );
275 /* We decoded a valid frame */
276 if( p_dec->fmt_out.audio.i_rate != frame.samplerate )
278 aout_DateInit( &p_sys->date, frame.samplerate );
279 aout_DateSet( &p_sys->date, p_block->i_pts );
281 p_block->i_pts = 0; /* PTS is valid only once */
283 p_dec->fmt_out.audio.i_rate = frame.samplerate;
284 p_dec->fmt_out.audio.i_channels = frame.channels;
287 /* Convert frame.channel_position to our own channel values */
288 for( i = 0; i < frame.channels; i++ )
290 /* Find the channel code */
291 for( j = 0; j < MAX_CHANNEL_POSITIONS; j++ )
293 if( frame.channel_position[i] == pi_channels_in[j] )
295 p_sys->pi_channel_positions[i] = pi_channels_out[j];
296 p_dec->fmt_out.audio.i_physical_channels |=
302 p_dec->fmt_out.audio.i_original_channels =
303 p_dec->fmt_out.audio.i_physical_channels;
305 p_out = p_dec->pf_aout_buffer_new(p_dec, frame.samples/frame.channels);
309 block_Release( p_block );
313 p_out->start_date = aout_DateGet( &p_sys->date );
314 p_out->end_date = aout_DateIncrement( &p_sys->date,
315 frame.samples / frame.channels );
317 DoReordering( p_dec, (uint32_t *)p_out->p_buffer, samples,
318 frame.samples / frame.channels, frame.channels,
319 p_sys->pi_channel_positions );
321 p_sys->i_buffer -= frame.bytesconsumed;
322 if( p_sys->i_buffer > 0 )
324 memmove( p_sys->p_buffer, &p_sys->p_buffer[frame.bytesconsumed],
331 block_Release( p_block );
335 /*****************************************************************************
337 *****************************************************************************/
338 static void Close( vlc_object_t *p_this )
340 decoder_t *p_dec = (decoder_t *)p_this;
341 decoder_sys_t *p_sys = p_dec->p_sys;
343 faacDecClose( p_sys->hfaad );
347 /*****************************************************************************
348 * DoReordering: do some channel re-ordering (the ac3 channel order is
349 * different from the aac one).
350 *****************************************************************************/
351 static void DoReordering( decoder_t *p_dec,
352 uint32_t *p_out, uint32_t *p_in, int i_samples,
353 int i_nb_channels, uint32_t *pi_chan_positions )
355 int pi_chan_table[MAX_CHANNEL_POSITIONS];
358 /* Find the channels mapping */
359 for( i = 0, j = 0; i < MAX_CHANNEL_POSITIONS; i++ )
361 for( k = 0; k < i_nb_channels; k++ )
363 if( pi_channels_ordered[i] == pi_chan_positions[k] )
365 pi_chan_table[k] = j++;
371 /* Do the actual reordering */
372 for( i = 0; i < i_samples; i++ )
374 for( j = 0; j < i_nb_channels; j++ )
376 p_out[i * i_nb_channels + pi_chan_table[j]] =
377 p_in[i * i_nb_channels + j];