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 *****************************************************************************/
27 #include <vlc_codec.h>
28 #include <vlc_input.h>
32 /*****************************************************************************
34 *****************************************************************************/
35 static int Open( vlc_object_t * );
36 static void Close( vlc_object_t * );
39 set_description( _("AAC audio decoder (using libfaad2)") );
40 set_capability( "decoder", 100 );
41 set_category( CAT_INPUT );
42 set_subcategory( SUBCAT_INPUT_ACODEC );
43 set_callbacks( Open, Close );
46 /****************************************************************************
48 ****************************************************************************/
49 static aout_buffer_t *DecodeBlock( decoder_t *, block_t ** );
50 static void DoReordering( decoder_t *, uint32_t *, uint32_t *, int, int,
53 #define MAX_CHANNEL_POSITIONS 9
63 /* temporary buffer */
68 /* Channel positions of the current stream (for re-ordering) */
69 uint32_t pi_channel_positions[MAX_CHANNEL_POSITIONS];
71 vlc_bool_t b_sbr, b_ps;
76 static const uint32_t pi_channels_in[MAX_CHANNEL_POSITIONS] =
77 { FRONT_CHANNEL_CENTER, FRONT_CHANNEL_LEFT, FRONT_CHANNEL_RIGHT,
78 SIDE_CHANNEL_LEFT, SIDE_CHANNEL_RIGHT,
79 BACK_CHANNEL_LEFT, BACK_CHANNEL_RIGHT,
80 BACK_CHANNEL_CENTER, LFE_CHANNEL };
81 static const uint32_t pi_channels_out[MAX_CHANNEL_POSITIONS] =
82 { AOUT_CHAN_CENTER, AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT,
83 AOUT_CHAN_MIDDLELEFT, AOUT_CHAN_MIDDLERIGHT,
84 AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT,
85 AOUT_CHAN_REARCENTER, AOUT_CHAN_LFE };
86 static const uint32_t pi_channels_ordered[MAX_CHANNEL_POSITIONS] =
87 { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT,
88 AOUT_CHAN_MIDDLELEFT, AOUT_CHAN_MIDDLERIGHT,
89 AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT,
90 AOUT_CHAN_CENTER, AOUT_CHAN_REARCENTER, AOUT_CHAN_LFE
92 static const uint32_t pi_channels_guessed[MAX_CHANNEL_POSITIONS] =
93 { 0, AOUT_CHAN_CENTER, AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT,
94 AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_LFE,
95 AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_REARLEFT
96 | AOUT_CHAN_REARRIGHT,
97 AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_REARLEFT
98 | AOUT_CHAN_REARRIGHT | AOUT_CHAN_CENTER,
99 AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_REARLEFT
100 | AOUT_CHAN_REARRIGHT | AOUT_CHAN_CENTER | AOUT_CHAN_LFE,
101 AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_MIDDLELEFT
102 | AOUT_CHAN_MIDDLERIGHT | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT
104 AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_MIDDLELEFT
105 | AOUT_CHAN_MIDDLERIGHT | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT
106 | AOUT_CHAN_CENTER | AOUT_CHAN_LFE
109 /*****************************************************************************
110 * OpenDecoder: probe the decoder and return score
111 *****************************************************************************/
112 static int Open( vlc_object_t *p_this )
114 decoder_t *p_dec = (decoder_t*)p_this;
115 decoder_sys_t *p_sys = p_dec->p_sys;
116 faacDecConfiguration *cfg;
118 if( p_dec->fmt_in.i_codec != VLC_FOURCC('m','p','4','a') )
123 /* Allocate the memory needed to store the decoder's structure */
124 if( ( p_dec->p_sys = p_sys =
125 (decoder_sys_t *)malloc(sizeof(decoder_sys_t)) ) == NULL )
127 msg_Err( p_dec, "out of memory" );
131 /* Open a faad context */
132 if( ( p_sys->hfaad = faacDecOpen() ) == NULL )
134 msg_Err( p_dec, "cannot initialize faad" );
139 aout_DateSet( &p_sys->date, 0 );
140 p_dec->fmt_out.i_cat = AUDIO_ES;
142 if (vlc_CPU() & CPU_CAPABILITY_FPU)
143 p_dec->fmt_out.i_codec = VLC_FOURCC('f','l','3','2');
145 p_dec->fmt_out.i_codec = AOUT_FMT_S16_NE;
146 p_dec->pf_decode_audio = DecodeBlock;
148 p_dec->fmt_out.audio.i_physical_channels =
149 p_dec->fmt_out.audio.i_original_channels = 0;
151 if( p_dec->fmt_in.i_extra > 0 )
153 /* We have a decoder config so init the handle */
154 unsigned long i_rate;
155 unsigned char i_channels;
157 if( faacDecInit2( p_sys->hfaad, p_dec->fmt_in.p_extra,
158 p_dec->fmt_in.i_extra,
159 &i_rate, &i_channels ) < 0 )
164 p_dec->fmt_out.audio.i_rate = i_rate;
165 p_dec->fmt_out.audio.i_channels = i_channels;
166 p_dec->fmt_out.audio.i_physical_channels
167 = p_dec->fmt_out.audio.i_original_channels
168 = pi_channels_guessed[i_channels];
169 aout_DateInit( &p_sys->date, i_rate );
173 /* Will be initalised from first frame */
174 p_dec->fmt_out.audio.i_rate = 0;
175 p_dec->fmt_out.audio.i_channels = 0;
178 /* Set the faad config */
179 cfg = faacDecGetCurrentConfiguration( p_sys->hfaad );
180 if (vlc_CPU() & CPU_CAPABILITY_FPU)
181 cfg->outputFormat = FAAD_FMT_FLOAT;
183 cfg->outputFormat = FAAD_FMT_16BIT;
184 faacDecSetConfiguration( p_sys->hfaad, cfg );
187 p_sys->i_buffer = p_sys->i_buffer_size = 0;
190 p_sys->i_input_rate = INPUT_RATE_DEFAULT;
192 /* Faad2 can't deal with truncated data (eg. from MPEG TS) */
193 p_dec->b_need_packetized = VLC_TRUE;
195 p_sys->b_sbr = p_sys->b_ps = VLC_FALSE;
199 /*****************************************************************************
201 *****************************************************************************/
202 static aout_buffer_t *DecodeBlock( decoder_t *p_dec, block_t **pp_block )
204 decoder_sys_t *p_sys = p_dec->p_sys;
207 if( !pp_block || !*pp_block ) return NULL;
211 if( p_block->i_flags&(BLOCK_FLAG_DISCONTINUITY|BLOCK_FLAG_CORRUPTED) )
213 block_Release( p_block );
217 if( p_block->i_rate > 0 )
218 p_sys->i_input_rate = p_block->i_rate;
220 /* Append the block to the temporary buffer */
221 if( p_sys->i_buffer_size < p_sys->i_buffer + p_block->i_buffer )
223 p_sys->i_buffer_size = p_sys->i_buffer + p_block->i_buffer;
224 p_sys->p_buffer = realloc( p_sys->p_buffer, p_sys->i_buffer_size );
227 if( p_block->i_buffer )
229 memcpy( &p_sys->p_buffer[p_sys->i_buffer],
230 p_block->p_buffer, p_block->i_buffer );
231 p_sys->i_buffer += p_block->i_buffer;
232 p_block->i_buffer = 0;
235 if( p_dec->fmt_out.audio.i_rate == 0 && p_dec->fmt_in.i_extra > 0 )
237 /* We have a decoder config so init the handle */
238 unsigned long i_rate;
239 unsigned char i_channels;
241 if( faacDecInit2( p_sys->hfaad, p_dec->fmt_in.p_extra,
242 p_dec->fmt_in.i_extra,
243 &i_rate, &i_channels ) >= 0 )
245 p_dec->fmt_out.audio.i_rate = i_rate;
246 p_dec->fmt_out.audio.i_channels = i_channels;
247 aout_DateInit( &p_sys->date, i_rate );
251 if( p_dec->fmt_out.audio.i_rate == 0 && p_sys->i_buffer )
253 unsigned long i_rate;
254 unsigned char i_channels;
256 /* Init faad with the first frame */
257 if( faacDecInit( p_sys->hfaad,
258 p_sys->p_buffer, p_sys->i_buffer,
259 &i_rate, &i_channels ) < 0 )
261 block_Release( p_block );
265 p_dec->fmt_out.audio.i_rate = i_rate;
266 p_dec->fmt_out.audio.i_channels = i_channels;
267 aout_DateInit( &p_sys->date, i_rate );
270 if( p_block->i_pts != 0 && p_block->i_pts != aout_DateGet( &p_sys->date ) )
272 aout_DateSet( &p_sys->date, p_block->i_pts );
274 else if( !aout_DateGet( &p_sys->date ) )
276 /* We've just started the stream, wait for the first PTS. */
277 block_Release( p_block );
282 /* Decode all data */
283 if( p_sys->i_buffer )
286 faacDecFrameInfo frame;
287 aout_buffer_t *p_out;
290 samples = faacDecDecode( p_sys->hfaad, &frame,
291 p_sys->p_buffer, p_sys->i_buffer );
293 if( frame.error > 0 )
295 msg_Warn( p_dec, "%s", faacDecGetErrorMessage( frame.error ) );
297 /* Flush the buffer */
299 block_Release( p_block );
303 if( frame.channels <= 0 || frame.channels > 8 || frame.channels == 7 )
305 msg_Warn( p_dec, "invalid channels count: %i", frame.channels );
307 /* Flush the buffer */
308 p_sys->i_buffer -= frame.bytesconsumed;
309 if( p_sys->i_buffer > 0 )
311 memmove( p_sys->p_buffer,&p_sys->p_buffer[frame.bytesconsumed],
314 block_Release( p_block );
318 if( frame.samples <= 0 )
320 msg_Warn( p_dec, "decoded zero sample" );
322 /* Flush the buffer */
323 p_sys->i_buffer -= frame.bytesconsumed;
324 if( p_sys->i_buffer > 0 )
326 memmove( p_sys->p_buffer,&p_sys->p_buffer[frame.bytesconsumed],
329 block_Release( p_block );
333 /* We decoded a valid frame */
334 if( p_dec->fmt_out.audio.i_rate != frame.samplerate )
336 aout_DateInit( &p_sys->date, frame.samplerate );
337 aout_DateSet( &p_sys->date, p_block->i_pts );
339 p_block->i_pts = 0; /* PTS is valid only once */
341 p_dec->fmt_out.audio.i_rate = frame.samplerate;
342 p_dec->fmt_out.audio.i_channels = frame.channels;
344 /* Adjust stream info when dealing with SBR/PS */
345 if( (p_sys->b_sbr != frame.sbr || p_sys->b_ps != frame.ps) &&
346 p_dec->p_parent->i_object_type == VLC_OBJECT_INPUT )
348 input_thread_t *p_input = (input_thread_t *)p_dec->p_parent;
350 const char *psz_ext = (frame.sbr && frame.ps) ? "SBR+PS" :
351 frame.sbr ? "SBR" : "PS";
353 msg_Dbg( p_dec, "AAC %s (channels: %u, samplerate: %lu)",
354 psz_ext, frame.channels, frame.samplerate );
356 asprintf( &psz_cat, _("Stream %d"), p_dec->fmt_in.i_id );
357 input_Control( p_input, INPUT_ADD_INFO, psz_cat,
358 _("AAC extension"), "%s", psz_ext );
359 input_Control( p_input, INPUT_ADD_INFO, psz_cat,
360 _("Channels"), "%d", frame.channels );
361 input_Control( p_input, INPUT_ADD_INFO, psz_cat,
362 _("Sample rate"), _("%d Hz"), frame.samplerate );
364 p_sys->b_sbr = frame.sbr; p_sys->b_ps = frame.ps;
367 /* Convert frame.channel_position to our own channel values */
368 p_dec->fmt_out.audio.i_physical_channels = 0;
369 for( i = 0; i < frame.channels; i++ )
371 /* Find the channel code */
372 for( j = 0; j < MAX_CHANNEL_POSITIONS; j++ )
374 if( frame.channel_position[i] == pi_channels_in[j] )
377 if( j >= MAX_CHANNEL_POSITIONS )
379 msg_Warn( p_dec, "unknown channel ordering" );
380 /* Invent something */
384 p_sys->pi_channel_positions[i] = pi_channels_out[j];
385 if( p_dec->fmt_out.audio.i_physical_channels & pi_channels_out[j] )
386 frame.channels--; /* We loose a duplicated channel */
388 p_dec->fmt_out.audio.i_physical_channels |= pi_channels_out[j];
390 p_dec->fmt_out.audio.i_original_channels =
391 p_dec->fmt_out.audio.i_physical_channels;
393 p_out = p_dec->pf_aout_buffer_new(p_dec, frame.samples/frame.channels);
397 block_Release( p_block );
401 p_out->start_date = aout_DateGet( &p_sys->date );
402 p_out->end_date = aout_DateIncrement( &p_sys->date,
403 (frame.samples / frame.channels) * p_sys->i_input_rate / INPUT_RATE_DEFAULT );
405 DoReordering( p_dec, (uint32_t *)p_out->p_buffer, samples,
406 frame.samples / frame.channels, frame.channels,
407 p_sys->pi_channel_positions );
409 p_sys->i_buffer -= frame.bytesconsumed;
410 if( p_sys->i_buffer > 0 )
412 memmove( p_sys->p_buffer, &p_sys->p_buffer[frame.bytesconsumed],
419 block_Release( p_block );
423 /*****************************************************************************
425 *****************************************************************************/
426 static void Close( vlc_object_t *p_this )
428 decoder_t *p_dec = (decoder_t *)p_this;
429 decoder_sys_t *p_sys = p_dec->p_sys;
431 faacDecClose( p_sys->hfaad );
432 if( p_sys->p_buffer ) free( p_sys->p_buffer );
436 /*****************************************************************************
437 * DoReordering: do some channel re-ordering (the ac3 channel order is
438 * different from the aac one).
439 *****************************************************************************/
440 static void DoReordering( decoder_t *p_dec,
441 uint32_t *p_out, uint32_t *p_in, int i_samples,
442 int i_nb_channels, uint32_t *pi_chan_positions )
444 int pi_chan_table[MAX_CHANNEL_POSITIONS];
447 /* Find the channels mapping */
448 for( k = 0, j = 0; k < i_nb_channels; k++ )
450 for( i = 0; i < MAX_CHANNEL_POSITIONS; i++ )
452 if( pi_channels_ordered[i] == pi_chan_positions[k] )
454 pi_chan_table[k] = j++;
460 /* Do the actual reordering */
461 if( vlc_CPU() & CPU_CAPABILITY_FPU )
462 for( i = 0; i < i_samples; i++ )
463 for( j = 0; j < i_nb_channels; j++ )
464 p_out[i * i_nb_channels + pi_chan_table[j]] =
465 p_in[i * i_nb_channels + j];
467 for( i = 0; i < i_samples; i++ )
468 for( j = 0; j < i_nb_channels; j++ )
469 ((uint16_t *)p_out)[i * i_nb_channels + pi_chan_table[j]] =
470 ((uint16_t *)p_in)[i * i_nb_channels + j];