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>
31 #include <vlc_input.h>
33 #include <vlc_codec.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];
78 static const uint32_t pi_channels_in[MAX_CHANNEL_POSITIONS] =
79 { FRONT_CHANNEL_CENTER, FRONT_CHANNEL_LEFT, FRONT_CHANNEL_RIGHT,
80 SIDE_CHANNEL_LEFT, SIDE_CHANNEL_RIGHT,
81 BACK_CHANNEL_LEFT, BACK_CHANNEL_RIGHT,
82 BACK_CHANNEL_CENTER, LFE_CHANNEL };
83 static const uint32_t pi_channels_out[MAX_CHANNEL_POSITIONS] =
84 { AOUT_CHAN_CENTER, AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT,
85 AOUT_CHAN_MIDDLELEFT, AOUT_CHAN_MIDDLERIGHT,
86 AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT,
87 AOUT_CHAN_REARCENTER, AOUT_CHAN_LFE };
88 static const uint32_t pi_channels_ordered[MAX_CHANNEL_POSITIONS] =
89 { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT,
90 AOUT_CHAN_MIDDLELEFT, AOUT_CHAN_MIDDLERIGHT,
91 AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT,
92 AOUT_CHAN_CENTER, AOUT_CHAN_REARCENTER, AOUT_CHAN_LFE
94 static const uint32_t pi_channels_guessed[MAX_CHANNEL_POSITIONS] =
95 { 0, AOUT_CHAN_CENTER, AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT,
96 AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_LFE,
97 AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_REARLEFT
98 | AOUT_CHAN_REARRIGHT,
99 AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_REARLEFT
100 | AOUT_CHAN_REARRIGHT | AOUT_CHAN_CENTER,
101 AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_REARLEFT
102 | AOUT_CHAN_REARRIGHT | AOUT_CHAN_CENTER | AOUT_CHAN_LFE,
103 AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_MIDDLELEFT
104 | AOUT_CHAN_MIDDLERIGHT | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT
106 AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_MIDDLELEFT
107 | AOUT_CHAN_MIDDLERIGHT | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT
108 | AOUT_CHAN_CENTER | AOUT_CHAN_LFE
111 /*****************************************************************************
112 * OpenDecoder: probe the decoder and return score
113 *****************************************************************************/
114 static int Open( vlc_object_t *p_this )
116 decoder_t *p_dec = (decoder_t*)p_this;
117 decoder_sys_t *p_sys = p_dec->p_sys;
118 faacDecConfiguration *cfg;
120 if( p_dec->fmt_in.i_codec != VLC_FOURCC('m','p','4','a') )
125 /* Allocate the memory needed to store the decoder's structure */
126 if( ( p_dec->p_sys = p_sys = malloc( sizeof(*p_sys) ) ) == NULL )
129 /* Open a faad context */
130 if( ( p_sys->hfaad = faacDecOpen() ) == NULL )
132 msg_Err( p_dec, "cannot initialize faad" );
137 aout_DateSet( &p_sys->date, 0 );
138 p_dec->fmt_out.i_cat = AUDIO_ES;
140 if (vlc_CPU() & CPU_CAPABILITY_FPU)
141 p_dec->fmt_out.i_codec = VLC_FOURCC('f','l','3','2');
143 p_dec->fmt_out.i_codec = AOUT_FMT_S16_NE;
144 p_dec->pf_decode_audio = DecodeBlock;
146 p_dec->fmt_out.audio.i_physical_channels =
147 p_dec->fmt_out.audio.i_original_channels = 0;
149 if( p_dec->fmt_in.i_extra > 0 )
151 /* We have a decoder config so init the handle */
152 unsigned long i_rate;
153 unsigned char i_channels;
155 if( faacDecInit2( p_sys->hfaad, p_dec->fmt_in.p_extra,
156 p_dec->fmt_in.i_extra,
157 &i_rate, &i_channels ) < 0 )
162 p_dec->fmt_out.audio.i_rate = i_rate;
163 p_dec->fmt_out.audio.i_channels = i_channels;
164 p_dec->fmt_out.audio.i_physical_channels
165 = p_dec->fmt_out.audio.i_original_channels
166 = pi_channels_guessed[i_channels];
167 aout_DateInit( &p_sys->date, i_rate );
171 /* Will be initalised from first frame */
172 p_dec->fmt_out.audio.i_rate = 0;
173 p_dec->fmt_out.audio.i_channels = 0;
176 /* Set the faad config */
177 cfg = faacDecGetCurrentConfiguration( p_sys->hfaad );
178 if (vlc_CPU() & CPU_CAPABILITY_FPU)
179 cfg->outputFormat = FAAD_FMT_FLOAT;
181 cfg->outputFormat = FAAD_FMT_16BIT;
182 faacDecSetConfiguration( p_sys->hfaad, cfg );
185 p_sys->i_buffer = p_sys->i_buffer_size = 0;
186 p_sys->p_buffer = NULL;
188 /* Faad2 can't deal with truncated data (eg. from MPEG TS) */
189 p_dec->b_need_packetized = true;
191 p_sys->b_sbr = p_sys->b_ps = false;
195 /*****************************************************************************
197 *****************************************************************************/
198 static aout_buffer_t *DecodeBlock( decoder_t *p_dec, block_t **pp_block )
200 decoder_sys_t *p_sys = p_dec->p_sys;
203 if( !pp_block || !*pp_block ) return NULL;
207 if( p_block->i_flags&(BLOCK_FLAG_DISCONTINUITY|BLOCK_FLAG_CORRUPTED) )
209 block_Release( p_block );
213 /* Remove ADTS header if we have decoder specific config */
214 if( p_dec->fmt_in.i_extra && p_block->i_buffer > 7 )
216 if( p_block->p_buffer[0] == 0xff &&
217 ( p_block->p_buffer[1] & 0xf0 ) == 0xf0 ) /* syncword */
218 { /* ADTS header present */
219 size_t i_header_size; /* 7 bytes (+ 2 bytes for crc) */
220 i_header_size = 7 + ( ( p_block->p_buffer[1] & 0x01 ) ? 0 : 2 );
221 /* FIXME: multiple blocks per frame */
222 if( p_block->i_buffer > i_header_size )
224 vlc_memcpy( p_block->p_buffer,
225 p_block->p_buffer + i_header_size,
226 p_block->i_buffer - i_header_size );
227 p_block->i_buffer -= i_header_size;
232 /* Append the block to the temporary buffer */
233 if( p_sys->i_buffer_size < p_sys->i_buffer + p_block->i_buffer )
235 p_sys->i_buffer_size = p_sys->i_buffer + p_block->i_buffer;
236 p_sys->p_buffer = realloc( p_sys->p_buffer, p_sys->i_buffer_size );
239 if( p_block->i_buffer > 0 )
241 vlc_memcpy( &p_sys->p_buffer[p_sys->i_buffer],
242 p_block->p_buffer, p_block->i_buffer );
243 p_sys->i_buffer += p_block->i_buffer;
244 p_block->i_buffer = 0;
247 if( p_dec->fmt_out.audio.i_rate == 0 && p_dec->fmt_in.i_extra > 0 )
249 /* We have a decoder config so init the handle */
250 unsigned long i_rate;
251 unsigned char i_channels;
253 if( faacDecInit2( p_sys->hfaad, p_dec->fmt_in.p_extra,
254 p_dec->fmt_in.i_extra,
255 &i_rate, &i_channels ) >= 0 )
257 p_dec->fmt_out.audio.i_rate = i_rate;
258 p_dec->fmt_out.audio.i_channels = i_channels;
259 p_dec->fmt_out.audio.i_physical_channels
260 = p_dec->fmt_out.audio.i_original_channels
261 = pi_channels_guessed[i_channels];
263 aout_DateInit( &p_sys->date, i_rate );
267 if( p_dec->fmt_out.audio.i_rate == 0 && p_sys->i_buffer )
269 unsigned long i_rate;
270 unsigned char i_channels;
272 /* Init faad with the first frame */
273 if( faacDecInit( p_sys->hfaad,
274 p_sys->p_buffer, p_sys->i_buffer,
275 &i_rate, &i_channels ) < 0 )
277 block_Release( p_block );
281 p_dec->fmt_out.audio.i_rate = i_rate;
282 p_dec->fmt_out.audio.i_channels = i_channels;
283 p_dec->fmt_out.audio.i_physical_channels
284 = p_dec->fmt_out.audio.i_original_channels
285 = pi_channels_guessed[i_channels];
286 aout_DateInit( &p_sys->date, i_rate );
289 if( p_block->i_pts != 0 && p_block->i_pts != aout_DateGet( &p_sys->date ) )
291 aout_DateSet( &p_sys->date, p_block->i_pts );
293 else if( !aout_DateGet( &p_sys->date ) )
295 /* We've just started the stream, wait for the first PTS. */
296 block_Release( p_block );
301 /* Decode all data */
302 if( p_sys->i_buffer )
305 faacDecFrameInfo frame;
306 aout_buffer_t *p_out;
309 samples = faacDecDecode( p_sys->hfaad, &frame,
310 p_sys->p_buffer, p_sys->i_buffer );
312 if( frame.error > 0 )
314 msg_Warn( p_dec, "%s", faacDecGetErrorMessage( frame.error ) );
316 /* Flush the buffer */
318 block_Release( p_block );
322 if( frame.channels <= 0 || frame.channels > 8 || frame.channels == 7 )
324 msg_Warn( p_dec, "invalid channels count: %i", frame.channels );
326 /* Flush the buffer */
327 p_sys->i_buffer -= frame.bytesconsumed;
328 if( p_sys->i_buffer > 0 )
330 memmove( p_sys->p_buffer,&p_sys->p_buffer[frame.bytesconsumed],
333 block_Release( p_block );
337 if( frame.samples <= 0 )
339 msg_Warn( p_dec, "decoded zero sample" );
341 /* Flush the buffer */
342 p_sys->i_buffer -= frame.bytesconsumed;
343 if( p_sys->i_buffer > 0 )
345 memmove( p_sys->p_buffer,&p_sys->p_buffer[frame.bytesconsumed],
348 block_Release( p_block );
352 /* We decoded a valid frame */
353 if( p_dec->fmt_out.audio.i_rate != frame.samplerate )
355 aout_DateInit( &p_sys->date, frame.samplerate );
356 aout_DateSet( &p_sys->date, p_block->i_pts );
358 p_block->i_pts = 0; /* PTS is valid only once */
360 p_dec->fmt_out.audio.i_rate = frame.samplerate;
361 p_dec->fmt_out.audio.i_channels = frame.channels;
362 p_dec->fmt_out.audio.i_physical_channels
363 = p_dec->fmt_out.audio.i_original_channels
364 = pi_channels_guessed[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 )
369 const char *psz_ext = (frame.sbr && frame.ps) ? "SBR+PS" :
370 frame.sbr ? "SBR" : "PS";
372 msg_Dbg( p_dec, "AAC %s (channels: %u, samplerate: %lu)",
373 psz_ext, frame.channels, frame.samplerate );
375 if( !p_dec->p_description )
376 p_dec->p_description = vlc_meta_New();
377 if( p_dec->p_description )
378 vlc_meta_AddExtra( p_dec->p_description, _("AAC extension"), psz_ext );
380 p_sys->b_sbr = frame.sbr; p_sys->b_ps = frame.ps;
383 /* Convert frame.channel_position to our own channel values */
384 p_dec->fmt_out.audio.i_physical_channels = 0;
385 for( i = 0; i < frame.channels; i++ )
387 /* Find the channel code */
388 for( j = 0; j < MAX_CHANNEL_POSITIONS; j++ )
390 if( frame.channel_position[i] == pi_channels_in[j] )
393 if( j >= MAX_CHANNEL_POSITIONS )
395 msg_Warn( p_dec, "unknown channel ordering" );
396 /* Invent something */
400 p_sys->pi_channel_positions[i] = pi_channels_out[j];
401 if( p_dec->fmt_out.audio.i_physical_channels & pi_channels_out[j] )
402 frame.channels--; /* We loose a duplicated channel */
404 p_dec->fmt_out.audio.i_physical_channels |= pi_channels_out[j];
406 p_dec->fmt_out.audio.i_original_channels =
407 p_dec->fmt_out.audio.i_physical_channels;
409 p_out = decoder_NewAudioBuffer(p_dec, frame.samples/frame.channels);
413 block_Release( p_block );
417 p_out->start_date = aout_DateGet( &p_sys->date );
418 p_out->end_date = aout_DateIncrement( &p_sys->date, frame.samples / frame.channels );
420 DoReordering( (uint32_t *)p_out->p_buffer, samples,
421 frame.samples / frame.channels, frame.channels,
422 p_sys->pi_channel_positions );
424 p_sys->i_buffer -= frame.bytesconsumed;
425 if( p_sys->i_buffer > 0 )
427 memmove( p_sys->p_buffer, &p_sys->p_buffer[frame.bytesconsumed],
434 block_Release( p_block );
438 /*****************************************************************************
440 *****************************************************************************/
441 static void Close( vlc_object_t *p_this )
443 decoder_t *p_dec = (decoder_t *)p_this;
444 decoder_sys_t *p_sys = p_dec->p_sys;
446 faacDecClose( p_sys->hfaad );
447 free( p_sys->p_buffer );
451 /*****************************************************************************
452 * DoReordering: do some channel re-ordering (the ac3 channel order is
453 * different from the aac one).
454 *****************************************************************************/
455 static void DoReordering( uint32_t *p_out, uint32_t *p_in, int i_samples,
456 int i_nb_channels, uint32_t *pi_chan_positions )
458 int pi_chan_table[MAX_CHANNEL_POSITIONS];
461 /* Find the channels mapping */
462 for( i = 0, j = 0; i < MAX_CHANNEL_POSITIONS; i++ )
464 for( k = 0; k < i_nb_channels; k++ )
466 if( pi_channels_ordered[i] == pi_chan_positions[k] )
468 pi_chan_table[k] = j++;
474 /* Do the actual reordering */
475 if( vlc_CPU() & CPU_CAPABILITY_FPU )
476 for( i = 0; i < i_samples; i++ )
477 for( j = 0; j < i_nb_channels; j++ )
478 p_out[i * i_nb_channels + pi_chan_table[j]] =
479 p_in[i * i_nb_channels + j];
481 for( i = 0; i < i_samples; i++ )
482 for( j = 0; j < i_nb_channels; j++ )
483 ((uint16_t *)p_out)[i * i_nb_channels + pi_chan_table[j]] =
484 ((uint16_t *)p_in)[i * i_nb_channels + j];