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 *****************************************************************************/
31 #include <vlc_codec.h>
32 #include <vlc_input.h>
36 /*****************************************************************************
38 *****************************************************************************/
39 static int Open( vlc_object_t * );
40 static void Close( vlc_object_t * );
43 set_description( _("AAC audio decoder (using libfaad2)") );
44 set_capability( "decoder", 100 );
45 set_category( CAT_INPUT );
46 set_subcategory( SUBCAT_INPUT_ACODEC );
47 set_callbacks( Open, Close );
50 /****************************************************************************
52 ****************************************************************************/
53 static aout_buffer_t *DecodeBlock( decoder_t *, block_t ** );
54 static void DoReordering( uint32_t *, uint32_t *, int, int, uint32_t * );
56 #define MAX_CHANNEL_POSITIONS 9
66 /* temporary buffer */
71 /* Channel positions of the current stream (for re-ordering) */
72 uint32_t pi_channel_positions[MAX_CHANNEL_POSITIONS];
74 vlc_bool_t b_sbr, b_ps;
79 static const uint32_t pi_channels_in[MAX_CHANNEL_POSITIONS] =
80 { FRONT_CHANNEL_CENTER, FRONT_CHANNEL_LEFT, FRONT_CHANNEL_RIGHT,
81 SIDE_CHANNEL_LEFT, SIDE_CHANNEL_RIGHT,
82 BACK_CHANNEL_LEFT, BACK_CHANNEL_RIGHT,
83 BACK_CHANNEL_CENTER, LFE_CHANNEL };
84 static const uint32_t pi_channels_out[MAX_CHANNEL_POSITIONS] =
85 { AOUT_CHAN_CENTER, AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT,
86 AOUT_CHAN_MIDDLELEFT, AOUT_CHAN_MIDDLERIGHT,
87 AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT,
88 AOUT_CHAN_REARCENTER, AOUT_CHAN_LFE };
89 static const uint32_t pi_channels_ordered[MAX_CHANNEL_POSITIONS] =
90 { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT,
91 AOUT_CHAN_MIDDLELEFT, AOUT_CHAN_MIDDLERIGHT,
92 AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT,
93 AOUT_CHAN_CENTER, AOUT_CHAN_REARCENTER, AOUT_CHAN_LFE
95 static const uint32_t pi_channels_guessed[MAX_CHANNEL_POSITIONS] =
96 { 0, AOUT_CHAN_CENTER, AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT,
97 AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_LFE,
98 AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_REARLEFT
99 | AOUT_CHAN_REARRIGHT,
100 AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_REARLEFT
101 | AOUT_CHAN_REARRIGHT | AOUT_CHAN_CENTER,
102 AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_REARLEFT
103 | AOUT_CHAN_REARRIGHT | AOUT_CHAN_CENTER | AOUT_CHAN_LFE,
104 AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_MIDDLELEFT
105 | AOUT_CHAN_MIDDLERIGHT | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT
107 AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_MIDDLELEFT
108 | AOUT_CHAN_MIDDLERIGHT | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT
109 | AOUT_CHAN_CENTER | AOUT_CHAN_LFE
112 /*****************************************************************************
113 * OpenDecoder: probe the decoder and return score
114 *****************************************************************************/
115 static int Open( vlc_object_t *p_this )
117 decoder_t *p_dec = (decoder_t*)p_this;
118 decoder_sys_t *p_sys = p_dec->p_sys;
119 faacDecConfiguration *cfg;
121 if( p_dec->fmt_in.i_codec != VLC_FOURCC('m','p','4','a') )
126 /* Allocate the memory needed to store the decoder's structure */
127 if( ( p_dec->p_sys = p_sys =
128 (decoder_sys_t *)malloc(sizeof(decoder_sys_t)) ) == NULL )
130 msg_Err( p_dec, "out of memory" );
134 /* Open a faad context */
135 if( ( p_sys->hfaad = faacDecOpen() ) == NULL )
137 msg_Err( p_dec, "cannot initialize faad" );
142 aout_DateSet( &p_sys->date, 0 );
143 p_dec->fmt_out.i_cat = AUDIO_ES;
145 if (vlc_CPU() & CPU_CAPABILITY_FPU)
146 p_dec->fmt_out.i_codec = VLC_FOURCC('f','l','3','2');
148 p_dec->fmt_out.i_codec = AOUT_FMT_S16_NE;
149 p_dec->pf_decode_audio = DecodeBlock;
151 p_dec->fmt_out.audio.i_physical_channels =
152 p_dec->fmt_out.audio.i_original_channels = 0;
154 if( p_dec->fmt_in.i_extra > 0 )
156 /* We have a decoder config so init the handle */
157 unsigned long i_rate;
158 unsigned char i_channels;
160 if( faacDecInit2( p_sys->hfaad, p_dec->fmt_in.p_extra,
161 p_dec->fmt_in.i_extra,
162 &i_rate, &i_channels ) < 0 )
167 p_dec->fmt_out.audio.i_rate = i_rate;
168 p_dec->fmt_out.audio.i_channels = i_channels;
169 p_dec->fmt_out.audio.i_physical_channels
170 = p_dec->fmt_out.audio.i_original_channels
171 = pi_channels_guessed[i_channels];
172 aout_DateInit( &p_sys->date, i_rate );
176 /* Will be initalised from first frame */
177 p_dec->fmt_out.audio.i_rate = 0;
178 p_dec->fmt_out.audio.i_channels = 0;
181 /* Set the faad config */
182 cfg = faacDecGetCurrentConfiguration( p_sys->hfaad );
183 if (vlc_CPU() & CPU_CAPABILITY_FPU)
184 cfg->outputFormat = FAAD_FMT_FLOAT;
186 cfg->outputFormat = FAAD_FMT_16BIT;
187 faacDecSetConfiguration( p_sys->hfaad, cfg );
190 p_sys->i_buffer = p_sys->i_buffer_size = 0;
193 p_sys->i_input_rate = INPUT_RATE_DEFAULT;
195 /* Faad2 can't deal with truncated data (eg. from MPEG TS) */
196 p_dec->b_need_packetized = VLC_TRUE;
198 p_sys->b_sbr = p_sys->b_ps = VLC_FALSE;
202 /*****************************************************************************
204 *****************************************************************************/
205 static aout_buffer_t *DecodeBlock( decoder_t *p_dec, block_t **pp_block )
207 decoder_sys_t *p_sys = p_dec->p_sys;
210 if( !pp_block || !*pp_block ) return NULL;
214 if( p_block->i_flags&(BLOCK_FLAG_DISCONTINUITY|BLOCK_FLAG_CORRUPTED) )
216 block_Release( p_block );
220 if( p_block->i_rate > 0 )
221 p_sys->i_input_rate = p_block->i_rate;
223 /* Remove ADTS header if we have decoder specific config */
224 if( p_dec->fmt_in.i_extra && p_block->i_buffer > 7 )
226 if( p_block->p_buffer[0] == 0xff &&
227 ( p_block->p_buffer[1] & 0xf0 ) == 0xf0 ) /* syncword */
228 { /* ADTS header present */
229 size_t i_header_size; /* 7 bytes (+ 2 bytes for crc) */
230 i_header_size = 7 + ( ( p_block->p_buffer[1] & 0x01 ) ? 0 : 2 );
231 /* FIXME: multiple blocks per frame */
232 if( p_block->i_buffer > i_header_size )
234 memcpy( p_block->p_buffer,
235 p_block->p_buffer + i_header_size,
236 p_block->i_buffer - i_header_size );
237 p_block->i_buffer -= i_header_size;
242 /* Append the block to the temporary buffer */
243 if( p_sys->i_buffer_size < p_sys->i_buffer + p_block->i_buffer )
245 p_sys->i_buffer_size = p_sys->i_buffer + p_block->i_buffer;
246 p_sys->p_buffer = realloc( p_sys->p_buffer, p_sys->i_buffer_size );
249 if( p_block->i_buffer )
251 memcpy( &p_sys->p_buffer[p_sys->i_buffer],
252 p_block->p_buffer, p_block->i_buffer );
253 p_sys->i_buffer += p_block->i_buffer;
254 p_block->i_buffer = 0;
257 if( p_dec->fmt_out.audio.i_rate == 0 && p_dec->fmt_in.i_extra > 0 )
259 /* We have a decoder config so init the handle */
260 unsigned long i_rate;
261 unsigned char i_channels;
263 if( faacDecInit2( p_sys->hfaad, p_dec->fmt_in.p_extra,
264 p_dec->fmt_in.i_extra,
265 &i_rate, &i_channels ) >= 0 )
267 p_dec->fmt_out.audio.i_rate = i_rate;
268 p_dec->fmt_out.audio.i_channels = i_channels;
269 aout_DateInit( &p_sys->date, i_rate );
273 if( p_dec->fmt_out.audio.i_rate == 0 && p_sys->i_buffer )
275 unsigned long i_rate;
276 unsigned char i_channels;
278 /* Init faad with the first frame */
279 if( faacDecInit( p_sys->hfaad,
280 p_sys->p_buffer, p_sys->i_buffer,
281 &i_rate, &i_channels ) < 0 )
283 block_Release( p_block );
287 p_dec->fmt_out.audio.i_rate = i_rate;
288 p_dec->fmt_out.audio.i_channels = i_channels;
289 aout_DateInit( &p_sys->date, i_rate );
292 if( p_block->i_pts != 0 && p_block->i_pts != aout_DateGet( &p_sys->date ) )
294 aout_DateSet( &p_sys->date, p_block->i_pts );
296 else if( !aout_DateGet( &p_sys->date ) )
298 /* We've just started the stream, wait for the first PTS. */
299 block_Release( p_block );
304 /* Decode all data */
305 if( p_sys->i_buffer )
308 faacDecFrameInfo frame;
309 aout_buffer_t *p_out;
312 samples = faacDecDecode( p_sys->hfaad, &frame,
313 p_sys->p_buffer, p_sys->i_buffer );
315 if( frame.error > 0 )
317 msg_Warn( p_dec, "%s", faacDecGetErrorMessage( frame.error ) );
319 /* Flush the buffer */
321 block_Release( p_block );
325 if( frame.channels <= 0 || frame.channels > 8 || frame.channels == 7 )
327 msg_Warn( p_dec, "invalid channels count: %i", frame.channels );
329 /* Flush the buffer */
330 p_sys->i_buffer -= frame.bytesconsumed;
331 if( p_sys->i_buffer > 0 )
333 memmove( p_sys->p_buffer,&p_sys->p_buffer[frame.bytesconsumed],
336 block_Release( p_block );
340 if( frame.samples <= 0 )
342 msg_Warn( p_dec, "decoded zero sample" );
344 /* Flush the buffer */
345 p_sys->i_buffer -= frame.bytesconsumed;
346 if( p_sys->i_buffer > 0 )
348 memmove( p_sys->p_buffer,&p_sys->p_buffer[frame.bytesconsumed],
351 block_Release( p_block );
355 /* We decoded a valid frame */
356 if( p_dec->fmt_out.audio.i_rate != frame.samplerate )
358 aout_DateInit( &p_sys->date, frame.samplerate );
359 aout_DateSet( &p_sys->date, p_block->i_pts );
361 p_block->i_pts = 0; /* PTS is valid only once */
363 p_dec->fmt_out.audio.i_rate = frame.samplerate;
364 p_dec->fmt_out.audio.i_channels = frame.channels;
366 /* Adjust stream info when dealing with SBR/PS */
367 if( (p_sys->b_sbr != frame.sbr || p_sys->b_ps != frame.ps) &&
368 p_dec->p_parent->i_object_type == VLC_OBJECT_INPUT )
370 input_thread_t *p_input = (input_thread_t *)p_dec->p_parent;
372 const char *psz_ext = (frame.sbr && frame.ps) ? "SBR+PS" :
373 frame.sbr ? "SBR" : "PS";
375 msg_Dbg( p_dec, "AAC %s (channels: %u, samplerate: %lu)",
376 psz_ext, frame.channels, frame.samplerate );
378 if( asprintf( &psz_cat, _("Stream %d"), p_dec->fmt_in.i_id ) != -1 )
380 input_Control( p_input, INPUT_ADD_INFO, psz_cat,
381 _("AAC extension"), "%s", psz_ext );
382 input_Control( p_input, INPUT_ADD_INFO, psz_cat,
383 _("Channels"), "%d", frame.channels );
384 input_Control( p_input, INPUT_ADD_INFO, psz_cat,
385 _("Sample rate"), _("%d Hz"), frame.samplerate );
388 p_sys->b_sbr = frame.sbr; p_sys->b_ps = frame.ps;
391 /* Convert frame.channel_position to our own channel values */
392 p_dec->fmt_out.audio.i_physical_channels = 0;
393 for( i = 0; i < frame.channels; i++ )
395 /* Find the channel code */
396 for( j = 0; j < MAX_CHANNEL_POSITIONS; j++ )
398 if( frame.channel_position[i] == pi_channels_in[j] )
401 if( j >= MAX_CHANNEL_POSITIONS )
403 msg_Warn( p_dec, "unknown channel ordering" );
404 /* Invent something */
408 p_sys->pi_channel_positions[i] = pi_channels_out[j];
409 if( p_dec->fmt_out.audio.i_physical_channels & pi_channels_out[j] )
410 frame.channels--; /* We loose a duplicated channel */
412 p_dec->fmt_out.audio.i_physical_channels |= pi_channels_out[j];
414 p_dec->fmt_out.audio.i_original_channels =
415 p_dec->fmt_out.audio.i_physical_channels;
417 p_out = p_dec->pf_aout_buffer_new(p_dec, frame.samples/frame.channels);
421 block_Release( p_block );
425 p_out->start_date = aout_DateGet( &p_sys->date );
426 p_out->end_date = aout_DateIncrement( &p_sys->date,
427 (frame.samples / frame.channels) * p_sys->i_input_rate / INPUT_RATE_DEFAULT );
429 DoReordering( (uint32_t *)p_out->p_buffer, samples,
430 frame.samples / frame.channels, frame.channels,
431 p_sys->pi_channel_positions );
433 p_sys->i_buffer -= frame.bytesconsumed;
434 if( p_sys->i_buffer > 0 )
436 memmove( p_sys->p_buffer, &p_sys->p_buffer[frame.bytesconsumed],
443 block_Release( p_block );
447 /*****************************************************************************
449 *****************************************************************************/
450 static void Close( vlc_object_t *p_this )
452 decoder_t *p_dec = (decoder_t *)p_this;
453 decoder_sys_t *p_sys = p_dec->p_sys;
455 faacDecClose( p_sys->hfaad );
456 free( p_sys->p_buffer );
460 /*****************************************************************************
461 * DoReordering: do some channel re-ordering (the ac3 channel order is
462 * different from the aac one).
463 *****************************************************************************/
464 static void DoReordering( uint32_t *p_out, uint32_t *p_in, int i_samples,
465 int i_nb_channels, uint32_t *pi_chan_positions )
467 int pi_chan_table[MAX_CHANNEL_POSITIONS];
470 /* Find the channels mapping */
471 for( i = 0, j = 0; i < MAX_CHANNEL_POSITIONS; i++ )
473 for( k = 0; k < i_nb_channels; k++ )
475 if( pi_channels_ordered[i] == pi_chan_positions[k] )
477 pi_chan_table[k] = j++;
483 /* Do the actual reordering */
484 if( vlc_CPU() & CPU_CAPABILITY_FPU )
485 for( i = 0; i < i_samples; i++ )
486 for( j = 0; j < i_nb_channels; j++ )
487 p_out[i * i_nb_channels + pi_chan_table[j]] =
488 p_in[i * i_nb_channels + j];
490 for( i = 0; i < i_samples; i++ )
491 for( j = 0; j < i_nb_channels; j++ )
492 ((uint16_t *)p_out)[i * i_nb_channels + pi_chan_table[j]] =
493 ((uint16_t *)p_in)[i * i_nb_channels + j];