1 /*****************************************************************************
2 * decoder.c: AAC decoder using libfaad2
3 *****************************************************************************
4 * Copyright (C) 2001, 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 *****************************************************************************/
29 #include <vlc_common.h>
30 #include <vlc_plugin.h>
32 #include <vlc_codec.h>
33 #include <vlc_input.h>
37 /*****************************************************************************
39 *****************************************************************************/
40 static int Open( vlc_object_t * );
41 static void Close( vlc_object_t * );
44 set_description( N_("AAC audio decoder (using libfaad2)") );
45 set_capability( "decoder", 100 );
46 set_category( CAT_INPUT );
47 set_subcategory( SUBCAT_INPUT_ACODEC );
48 set_callbacks( Open, Close );
51 /****************************************************************************
53 ****************************************************************************/
54 static aout_buffer_t *DecodeBlock( decoder_t *, block_t ** );
55 static void DoReordering( uint32_t *, uint32_t *, int, int, uint32_t * );
57 #define MAX_CHANNEL_POSITIONS 9
67 /* temporary buffer */
72 /* Channel positions of the current stream (for re-ordering) */
73 uint32_t pi_channel_positions[MAX_CHANNEL_POSITIONS];
80 static const uint32_t pi_channels_in[MAX_CHANNEL_POSITIONS] =
81 { FRONT_CHANNEL_CENTER, FRONT_CHANNEL_LEFT, FRONT_CHANNEL_RIGHT,
82 SIDE_CHANNEL_LEFT, SIDE_CHANNEL_RIGHT,
83 BACK_CHANNEL_LEFT, BACK_CHANNEL_RIGHT,
84 BACK_CHANNEL_CENTER, LFE_CHANNEL };
85 static const uint32_t pi_channels_out[MAX_CHANNEL_POSITIONS] =
86 { AOUT_CHAN_CENTER, AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT,
87 AOUT_CHAN_MIDDLELEFT, AOUT_CHAN_MIDDLERIGHT,
88 AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT,
89 AOUT_CHAN_REARCENTER, AOUT_CHAN_LFE };
90 static const uint32_t pi_channels_ordered[MAX_CHANNEL_POSITIONS] =
91 { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT,
92 AOUT_CHAN_MIDDLELEFT, AOUT_CHAN_MIDDLERIGHT,
93 AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT,
94 AOUT_CHAN_CENTER, AOUT_CHAN_REARCENTER, AOUT_CHAN_LFE
96 static const uint32_t pi_channels_guessed[MAX_CHANNEL_POSITIONS] =
97 { 0, AOUT_CHAN_CENTER, AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT,
98 AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_LFE,
99 AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_REARLEFT
100 | AOUT_CHAN_REARRIGHT,
101 AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_REARLEFT
102 | AOUT_CHAN_REARRIGHT | AOUT_CHAN_CENTER,
103 AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_REARLEFT
104 | AOUT_CHAN_REARRIGHT | AOUT_CHAN_CENTER | AOUT_CHAN_LFE,
105 AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_MIDDLELEFT
106 | AOUT_CHAN_MIDDLERIGHT | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT
108 AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_MIDDLELEFT
109 | AOUT_CHAN_MIDDLERIGHT | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT
110 | AOUT_CHAN_CENTER | AOUT_CHAN_LFE
113 /*****************************************************************************
114 * OpenDecoder: probe the decoder and return score
115 *****************************************************************************/
116 static int Open( vlc_object_t *p_this )
118 decoder_t *p_dec = (decoder_t*)p_this;
119 decoder_sys_t *p_sys = p_dec->p_sys;
120 faacDecConfiguration *cfg;
122 if( p_dec->fmt_in.i_codec != VLC_FOURCC('m','p','4','a') )
127 /* Allocate the memory needed to store the decoder's structure */
128 if( ( p_dec->p_sys = p_sys =
129 (decoder_sys_t *)malloc(sizeof(decoder_sys_t)) ) == NULL )
132 /* Open a faad context */
133 if( ( p_sys->hfaad = faacDecOpen() ) == NULL )
135 msg_Err( p_dec, "cannot initialize faad" );
140 aout_DateSet( &p_sys->date, 0 );
141 p_dec->fmt_out.i_cat = AUDIO_ES;
143 if (vlc_CPU() & CPU_CAPABILITY_FPU)
144 p_dec->fmt_out.i_codec = VLC_FOURCC('f','l','3','2');
146 p_dec->fmt_out.i_codec = AOUT_FMT_S16_NE;
147 p_dec->pf_decode_audio = DecodeBlock;
149 p_dec->fmt_out.audio.i_physical_channels =
150 p_dec->fmt_out.audio.i_original_channels = 0;
152 if( p_dec->fmt_in.i_extra > 0 )
154 /* We have a decoder config so init the handle */
155 unsigned long i_rate;
156 unsigned char i_channels;
158 if( faacDecInit2( p_sys->hfaad, p_dec->fmt_in.p_extra,
159 p_dec->fmt_in.i_extra,
160 &i_rate, &i_channels ) < 0 )
165 p_dec->fmt_out.audio.i_rate = i_rate;
166 p_dec->fmt_out.audio.i_channels = i_channels;
167 p_dec->fmt_out.audio.i_physical_channels
168 = p_dec->fmt_out.audio.i_original_channels
169 = pi_channels_guessed[i_channels];
170 aout_DateInit( &p_sys->date, i_rate );
174 /* Will be initalised from first frame */
175 p_dec->fmt_out.audio.i_rate = 0;
176 p_dec->fmt_out.audio.i_channels = 0;
179 /* Set the faad config */
180 cfg = faacDecGetCurrentConfiguration( p_sys->hfaad );
181 if (vlc_CPU() & CPU_CAPABILITY_FPU)
182 cfg->outputFormat = FAAD_FMT_FLOAT;
184 cfg->outputFormat = FAAD_FMT_16BIT;
185 faacDecSetConfiguration( p_sys->hfaad, cfg );
188 p_sys->i_buffer = p_sys->i_buffer_size = 0;
189 p_sys->p_buffer = NULL;
191 p_sys->i_input_rate = INPUT_RATE_DEFAULT;
193 /* Faad2 can't deal with truncated data (eg. from MPEG TS) */
194 p_dec->b_need_packetized = true;
196 p_sys->b_sbr = p_sys->b_ps = false;
200 /*****************************************************************************
202 *****************************************************************************/
203 static aout_buffer_t *DecodeBlock( decoder_t *p_dec, block_t **pp_block )
205 decoder_sys_t *p_sys = p_dec->p_sys;
208 if( !pp_block || !*pp_block ) return NULL;
212 if( p_block->i_flags&(BLOCK_FLAG_DISCONTINUITY|BLOCK_FLAG_CORRUPTED) )
214 block_Release( p_block );
218 if( p_block->i_rate > 0 )
219 p_sys->i_input_rate = p_block->i_rate;
221 /* Remove ADTS header if we have decoder specific config */
222 if( p_dec->fmt_in.i_extra && p_block->i_buffer > 7 )
224 if( p_block->p_buffer[0] == 0xff &&
225 ( p_block->p_buffer[1] & 0xf0 ) == 0xf0 ) /* syncword */
226 { /* ADTS header present */
227 size_t i_header_size; /* 7 bytes (+ 2 bytes for crc) */
228 i_header_size = 7 + ( ( p_block->p_buffer[1] & 0x01 ) ? 0 : 2 );
229 /* FIXME: multiple blocks per frame */
230 if( p_block->i_buffer > i_header_size )
232 vlc_memcpy( p_block->p_buffer,
233 p_block->p_buffer + i_header_size,
234 p_block->i_buffer - i_header_size );
235 p_block->i_buffer -= i_header_size;
240 /* Append the block to the temporary buffer */
241 if( p_sys->i_buffer_size < p_sys->i_buffer + p_block->i_buffer )
243 p_sys->i_buffer_size = p_sys->i_buffer + p_block->i_buffer;
244 p_sys->p_buffer = realloc( p_sys->p_buffer, p_sys->i_buffer_size );
247 if( p_block->i_buffer > 0 )
249 vlc_memcpy( &p_sys->p_buffer[p_sys->i_buffer],
250 p_block->p_buffer, p_block->i_buffer );
251 p_sys->i_buffer += p_block->i_buffer;
252 p_block->i_buffer = 0;
255 if( p_dec->fmt_out.audio.i_rate == 0 && p_dec->fmt_in.i_extra > 0 )
257 /* We have a decoder config so init the handle */
258 unsigned long i_rate;
259 unsigned char i_channels;
261 if( faacDecInit2( p_sys->hfaad, p_dec->fmt_in.p_extra,
262 p_dec->fmt_in.i_extra,
263 &i_rate, &i_channels ) >= 0 )
265 p_dec->fmt_out.audio.i_rate = i_rate;
266 p_dec->fmt_out.audio.i_channels = i_channels;
267 p_dec->fmt_out.audio.i_physical_channels
268 = p_dec->fmt_out.audio.i_original_channels
269 = pi_channels_guessed[i_channels];
271 aout_DateInit( &p_sys->date, i_rate );
275 if( p_dec->fmt_out.audio.i_rate == 0 && p_sys->i_buffer )
277 unsigned long i_rate;
278 unsigned char i_channels;
280 /* Init faad with the first frame */
281 if( faacDecInit( p_sys->hfaad,
282 p_sys->p_buffer, p_sys->i_buffer,
283 &i_rate, &i_channels ) < 0 )
285 block_Release( p_block );
289 p_dec->fmt_out.audio.i_rate = i_rate;
290 p_dec->fmt_out.audio.i_channels = i_channels;
291 p_dec->fmt_out.audio.i_physical_channels
292 = p_dec->fmt_out.audio.i_original_channels
293 = pi_channels_guessed[i_channels];
294 aout_DateInit( &p_sys->date, i_rate );
297 if( p_block->i_pts != 0 && p_block->i_pts != aout_DateGet( &p_sys->date ) )
299 aout_DateSet( &p_sys->date, p_block->i_pts );
301 else if( !aout_DateGet( &p_sys->date ) )
303 /* We've just started the stream, wait for the first PTS. */
304 block_Release( p_block );
309 /* Decode all data */
310 if( p_sys->i_buffer )
313 faacDecFrameInfo frame;
314 aout_buffer_t *p_out;
317 samples = faacDecDecode( p_sys->hfaad, &frame,
318 p_sys->p_buffer, p_sys->i_buffer );
320 if( frame.error > 0 )
322 msg_Warn( p_dec, "%s", faacDecGetErrorMessage( frame.error ) );
324 /* Flush the buffer */
326 block_Release( p_block );
330 if( frame.channels <= 0 || frame.channels > 8 || frame.channels == 7 )
332 msg_Warn( p_dec, "invalid channels count: %i", frame.channels );
334 /* Flush the buffer */
335 p_sys->i_buffer -= frame.bytesconsumed;
336 if( p_sys->i_buffer > 0 )
338 memmove( p_sys->p_buffer,&p_sys->p_buffer[frame.bytesconsumed],
341 block_Release( p_block );
345 if( frame.samples <= 0 )
347 msg_Warn( p_dec, "decoded zero sample" );
349 /* Flush the buffer */
350 p_sys->i_buffer -= frame.bytesconsumed;
351 if( p_sys->i_buffer > 0 )
353 memmove( p_sys->p_buffer,&p_sys->p_buffer[frame.bytesconsumed],
356 block_Release( p_block );
360 /* We decoded a valid frame */
361 if( p_dec->fmt_out.audio.i_rate != frame.samplerate )
363 aout_DateInit( &p_sys->date, frame.samplerate );
364 aout_DateSet( &p_sys->date, p_block->i_pts );
366 p_block->i_pts = 0; /* PTS is valid only once */
368 p_dec->fmt_out.audio.i_rate = frame.samplerate;
369 p_dec->fmt_out.audio.i_channels = frame.channels;
370 p_dec->fmt_out.audio.i_physical_channels
371 = p_dec->fmt_out.audio.i_original_channels
372 = pi_channels_guessed[frame.channels];
374 /* Adjust stream info when dealing with SBR/PS */
375 if( (p_sys->b_sbr != frame.sbr || p_sys->b_ps != frame.ps) &&
376 p_dec->p_parent->i_object_type == VLC_OBJECT_INPUT )
378 input_thread_t *p_input = (input_thread_t *)p_dec->p_parent;
380 const char *psz_ext = (frame.sbr && frame.ps) ? "SBR+PS" :
381 frame.sbr ? "SBR" : "PS";
383 msg_Dbg( p_dec, "AAC %s (channels: %u, samplerate: %lu)",
384 psz_ext, frame.channels, frame.samplerate );
386 if( asprintf( &psz_cat, _("Stream %d"), p_dec->fmt_in.i_id ) != -1 )
388 input_Control( p_input, INPUT_ADD_INFO, psz_cat,
389 _("AAC extension"), "%s", psz_ext );
390 input_Control( p_input, INPUT_ADD_INFO, psz_cat,
391 _("Channels"), "%d", frame.channels );
392 input_Control( p_input, INPUT_ADD_INFO, psz_cat,
393 _("Sample rate"), _("%d Hz"), frame.samplerate );
396 p_sys->b_sbr = frame.sbr; p_sys->b_ps = frame.ps;
399 /* Convert frame.channel_position to our own channel values */
400 p_dec->fmt_out.audio.i_physical_channels = 0;
401 for( i = 0; i < frame.channels; i++ )
403 /* Find the channel code */
404 for( j = 0; j < MAX_CHANNEL_POSITIONS; j++ )
406 if( frame.channel_position[i] == pi_channels_in[j] )
409 if( j >= MAX_CHANNEL_POSITIONS )
411 msg_Warn( p_dec, "unknown channel ordering" );
412 /* Invent something */
416 p_sys->pi_channel_positions[i] = pi_channels_out[j];
417 if( p_dec->fmt_out.audio.i_physical_channels & pi_channels_out[j] )
418 frame.channels--; /* We loose a duplicated channel */
420 p_dec->fmt_out.audio.i_physical_channels |= pi_channels_out[j];
422 p_dec->fmt_out.audio.i_original_channels =
423 p_dec->fmt_out.audio.i_physical_channels;
425 p_out = p_dec->pf_aout_buffer_new(p_dec, frame.samples/frame.channels);
429 block_Release( p_block );
433 p_out->start_date = aout_DateGet( &p_sys->date );
434 p_out->end_date = aout_DateIncrement( &p_sys->date,
435 (frame.samples / frame.channels) * p_sys->i_input_rate / INPUT_RATE_DEFAULT );
437 DoReordering( (uint32_t *)p_out->p_buffer, samples,
438 frame.samples / frame.channels, frame.channels,
439 p_sys->pi_channel_positions );
441 p_sys->i_buffer -= frame.bytesconsumed;
442 if( p_sys->i_buffer > 0 )
444 memmove( p_sys->p_buffer, &p_sys->p_buffer[frame.bytesconsumed],
451 block_Release( p_block );
455 /*****************************************************************************
457 *****************************************************************************/
458 static void Close( vlc_object_t *p_this )
460 decoder_t *p_dec = (decoder_t *)p_this;
461 decoder_sys_t *p_sys = p_dec->p_sys;
463 faacDecClose( p_sys->hfaad );
464 free( p_sys->p_buffer );
468 /*****************************************************************************
469 * DoReordering: do some channel re-ordering (the ac3 channel order is
470 * different from the aac one).
471 *****************************************************************************/
472 static void DoReordering( uint32_t *p_out, uint32_t *p_in, int i_samples,
473 int i_nb_channels, uint32_t *pi_chan_positions )
475 int pi_chan_table[MAX_CHANNEL_POSITIONS];
478 /* Find the channels mapping */
479 for( i = 0, j = 0; i < MAX_CHANNEL_POSITIONS; i++ )
481 for( k = 0; k < i_nb_channels; k++ )
483 if( pi_channels_ordered[i] == pi_chan_positions[k] )
485 pi_chan_table[k] = j++;
491 /* Do the actual reordering */
492 if( vlc_CPU() & CPU_CAPABILITY_FPU )
493 for( i = 0; i < i_samples; i++ )
494 for( j = 0; j < i_nb_channels; j++ )
495 p_out[i * i_nb_channels + pi_chan_table[j]] =
496 p_in[i * i_nb_channels + j];
498 for( i = 0; i < i_samples; i++ )
499 for( j = 0; j < i_nb_channels; j++ )
500 ((uint16_t *)p_out)[i * i_nb_channels + pi_chan_table[j]] =
501 ((uint16_t *)p_in)[i * i_nb_channels + j];