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>
38 /*****************************************************************************
40 *****************************************************************************/
41 static int Open( vlc_object_t * );
42 static void Close( vlc_object_t * );
45 set_description( N_("AAC audio decoder (using libfaad2)") )
46 set_capability( "decoder", 100 )
47 set_category( CAT_INPUT )
48 set_subcategory( SUBCAT_INPUT_ACODEC )
49 set_callbacks( Open, Close )
52 /****************************************************************************
54 ****************************************************************************/
55 static aout_buffer_t *DecodeBlock( decoder_t *, block_t ** );
56 static void DoReordering( uint32_t *, uint32_t *, int, int, uint32_t * );
58 #define MAX_CHANNEL_POSITIONS 9
68 /* temporary buffer */
73 /* Channel positions of the current stream (for re-ordering) */
74 uint32_t pi_channel_positions[MAX_CHANNEL_POSITIONS];
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_CODEC_MP4A )
126 /* Allocate the memory needed to store the decoder's structure */
127 if( ( p_dec->p_sys = p_sys = malloc( sizeof(*p_sys) ) ) == NULL )
130 /* Open a faad context */
131 if( ( p_sys->hfaad = faacDecOpen() ) == NULL )
133 msg_Err( p_dec, "cannot initialize faad" );
138 date_Set( &p_sys->date, 0 );
139 p_dec->fmt_out.i_cat = AUDIO_ES;
142 p_dec->fmt_out.i_codec = VLC_CODEC_FL32;
144 p_dec->fmt_out.i_codec = VLC_CODEC_S16N;
145 p_dec->pf_decode_audio = DecodeBlock;
147 p_dec->fmt_out.audio.i_physical_channels =
148 p_dec->fmt_out.audio.i_original_channels = 0;
150 if( p_dec->fmt_in.i_extra > 0 )
152 /* We have a decoder config so init the handle */
153 unsigned long i_rate;
154 unsigned char i_channels;
156 if( faacDecInit2( p_sys->hfaad, p_dec->fmt_in.p_extra,
157 p_dec->fmt_in.i_extra,
158 &i_rate, &i_channels ) < 0 )
160 msg_Err( p_dec, "Failed to initialize faad using extra data" );
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 date_Init( &p_sys->date, i_rate, 1 );
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 );
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;
188 p_sys->p_buffer = NULL;
190 /* Faad2 can't deal with truncated data (eg. from MPEG TS) */
191 p_dec->b_need_packetized = true;
193 p_sys->b_sbr = p_sys->b_ps = false;
197 /*****************************************************************************
199 *****************************************************************************/
200 static aout_buffer_t *DecodeBlock( decoder_t *p_dec, block_t **pp_block )
202 decoder_sys_t *p_sys = p_dec->p_sys;
205 if( !pp_block || !*pp_block ) return NULL;
209 if( p_block->i_flags&(BLOCK_FLAG_DISCONTINUITY|BLOCK_FLAG_CORRUPTED) )
211 block_Release( p_block );
215 /* Remove ADTS header if we have decoder specific config */
216 if( p_dec->fmt_in.i_extra && p_block->i_buffer > 7 )
218 if( p_block->p_buffer[0] == 0xff &&
219 ( p_block->p_buffer[1] & 0xf0 ) == 0xf0 ) /* syncword */
220 { /* ADTS header present */
221 size_t i_header_size; /* 7 bytes (+ 2 bytes for crc) */
222 i_header_size = 7 + ( ( p_block->p_buffer[1] & 0x01 ) ? 0 : 2 );
223 /* FIXME: multiple blocks per frame */
224 if( p_block->i_buffer > i_header_size )
226 p_block->p_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 size_t i_buffer_size = p_sys->i_buffer + p_block->i_buffer;
236 uint8_t *p_buffer = realloc( p_sys->p_buffer, i_buffer_size );
239 p_sys->i_buffer_size = i_buffer_size;
240 p_sys->p_buffer = p_buffer;
244 p_block->i_buffer = 0;
248 if( p_block->i_buffer > 0 )
250 vlc_memcpy( &p_sys->p_buffer[p_sys->i_buffer],
251 p_block->p_buffer, p_block->i_buffer );
252 p_sys->i_buffer += p_block->i_buffer;
253 p_block->i_buffer = 0;
256 if( p_dec->fmt_out.audio.i_rate == 0 && p_dec->fmt_in.i_extra > 0 )
258 /* We have a decoder config so init the handle */
259 unsigned long i_rate;
260 unsigned char i_channels;
262 if( faacDecInit2( p_sys->hfaad, p_dec->fmt_in.p_extra,
263 p_dec->fmt_in.i_extra,
264 &i_rate, &i_channels ) >= 0 )
266 p_dec->fmt_out.audio.i_rate = i_rate;
267 p_dec->fmt_out.audio.i_channels = i_channels;
268 p_dec->fmt_out.audio.i_physical_channels
269 = p_dec->fmt_out.audio.i_original_channels
270 = pi_channels_guessed[i_channels];
272 date_Init( &p_sys->date, i_rate, 1 );
276 if( p_dec->fmt_out.audio.i_rate == 0 && p_sys->i_buffer )
278 unsigned long i_rate;
279 unsigned char i_channels;
281 /* Init faad with the first frame */
282 if( faacDecInit( p_sys->hfaad,
283 p_sys->p_buffer, p_sys->i_buffer,
284 &i_rate, &i_channels ) < 0 )
286 block_Release( p_block );
290 p_dec->fmt_out.audio.i_rate = i_rate;
291 p_dec->fmt_out.audio.i_channels = i_channels;
292 p_dec->fmt_out.audio.i_physical_channels
293 = p_dec->fmt_out.audio.i_original_channels
294 = pi_channels_guessed[i_channels];
295 date_Init( &p_sys->date, i_rate, 1 );
298 if( p_block->i_pts > VLC_TS_INVALID && p_block->i_pts != date_Get( &p_sys->date ) )
300 date_Set( &p_sys->date, p_block->i_pts );
302 else if( !date_Get( &p_sys->date ) )
304 /* We've just started the stream, wait for the first PTS. */
305 block_Release( p_block );
310 /* Decode all data */
311 if( p_sys->i_buffer )
314 faacDecFrameInfo frame;
315 aout_buffer_t *p_out;
318 samples = faacDecDecode( p_sys->hfaad, &frame,
319 p_sys->p_buffer, p_sys->i_buffer );
321 if( frame.error > 0 )
323 msg_Warn( p_dec, "%s", faacDecGetErrorMessage( frame.error ) );
325 /* Flush the buffer */
327 block_Release( p_block );
331 if( frame.channels <= 0 || frame.channels > 8 || frame.channels == 7 )
333 msg_Warn( p_dec, "invalid channels count: %i", frame.channels );
335 /* Flush the buffer */
336 p_sys->i_buffer -= frame.bytesconsumed;
337 if( p_sys->i_buffer > 0 )
339 memmove( p_sys->p_buffer,&p_sys->p_buffer[frame.bytesconsumed],
342 block_Release( p_block );
346 if( frame.samples <= 0 )
348 msg_Warn( p_dec, "decoded zero sample" );
350 /* Flush the buffer */
351 p_sys->i_buffer -= frame.bytesconsumed;
352 if( p_sys->i_buffer > 0 )
354 memmove( p_sys->p_buffer,&p_sys->p_buffer[frame.bytesconsumed],
357 block_Release( p_block );
361 /* We decoded a valid frame */
362 if( p_dec->fmt_out.audio.i_rate != frame.samplerate )
364 date_Init( &p_sys->date, frame.samplerate, 1 );
365 date_Set( &p_sys->date, p_block->i_pts );
367 p_block->i_pts = VLC_TS_INVALID; /* PTS is valid only once */
369 p_dec->fmt_out.audio.i_rate = frame.samplerate;
370 p_dec->fmt_out.audio.i_channels = frame.channels;
371 p_dec->fmt_out.audio.i_physical_channels
372 = p_dec->fmt_out.audio.i_original_channels
373 = pi_channels_guessed[frame.channels];
375 /* Adjust stream info when dealing with SBR/PS */
376 bool b_sbr = (frame.sbr == 1) || (frame.sbr == 2);
377 if( p_sys->b_sbr != b_sbr || p_sys->b_ps != frame.ps )
379 const char *psz_ext = (b_sbr && frame.ps) ? "SBR+PS" :
380 b_sbr ? "SBR" : "PS";
382 msg_Dbg( p_dec, "AAC %s (channels: %u, samplerate: %lu)",
383 psz_ext, frame.channels, frame.samplerate );
385 if( !p_dec->p_description )
386 p_dec->p_description = vlc_meta_New();
387 if( p_dec->p_description )
388 vlc_meta_AddExtra( p_dec->p_description, _("AAC extension"), psz_ext );
390 p_sys->b_sbr = b_sbr;
391 p_sys->b_ps = frame.ps;
394 /* Convert frame.channel_position to our own channel values */
395 p_dec->fmt_out.audio.i_physical_channels = 0;
396 for( i = 0; i < frame.channels; i++ )
398 /* Find the channel code */
399 for( j = 0; j < MAX_CHANNEL_POSITIONS; j++ )
401 if( frame.channel_position[i] == pi_channels_in[j] )
404 if( j >= MAX_CHANNEL_POSITIONS )
406 msg_Warn( p_dec, "unknown channel ordering" );
407 /* Invent something */
411 p_sys->pi_channel_positions[i] = pi_channels_out[j];
412 if( p_dec->fmt_out.audio.i_physical_channels & pi_channels_out[j] )
413 frame.channels--; /* We loose a duplicated channel */
415 p_dec->fmt_out.audio.i_physical_channels |= pi_channels_out[j];
417 p_dec->fmt_out.audio.i_original_channels =
418 p_dec->fmt_out.audio.i_physical_channels;
420 p_out = decoder_NewAudioBuffer(p_dec, frame.samples/frame.channels);
424 block_Release( p_block );
428 p_out->i_pts = date_Get( &p_sys->date );
429 p_out->i_length = date_Increment( &p_sys->date,
430 frame.samples / frame.channels )
433 DoReordering( (uint32_t *)p_out->p_buffer, samples,
434 frame.samples / frame.channels, frame.channels,
435 p_sys->pi_channel_positions );
437 p_sys->i_buffer -= frame.bytesconsumed;
438 if( p_sys->i_buffer > 0 )
440 memmove( p_sys->p_buffer, &p_sys->p_buffer[frame.bytesconsumed],
447 block_Release( p_block );
451 /*****************************************************************************
453 *****************************************************************************/
454 static void Close( vlc_object_t *p_this )
456 decoder_t *p_dec = (decoder_t *)p_this;
457 decoder_sys_t *p_sys = p_dec->p_sys;
459 faacDecClose( p_sys->hfaad );
460 free( p_sys->p_buffer );
464 /*****************************************************************************
465 * DoReordering: do some channel re-ordering (the ac3 channel order is
466 * different from the aac one).
467 *****************************************************************************/
468 static void DoReordering( uint32_t *p_out, uint32_t *p_in, int i_samples,
469 int i_nb_channels, uint32_t *pi_chan_positions )
471 int pi_chan_table[MAX_CHANNEL_POSITIONS];
474 /* Find the channels mapping */
475 for( i = 0, j = 0; i < MAX_CHANNEL_POSITIONS; i++ )
477 for( k = 0; k < i_nb_channels; k++ )
479 if( pi_channels_ordered[i] == pi_chan_positions[k] )
481 pi_chan_table[k] = j++;
487 /* Do the actual reordering */
489 for( i = 0; i < i_samples; i++ )
490 for( j = 0; j < i_nb_channels; j++ )
491 p_out[i * i_nb_channels + pi_chan_table[j]] =
492 p_in[i * i_nb_channels + j];
494 for( i = 0; i < i_samples; i++ )
495 for( j = 0; j < i_nb_channels; j++ )
496 ((uint16_t *)p_out)[i * i_nb_channels + pi_chan_table[j]] =
497 ((uint16_t *)p_in)[i * i_nb_channels + j];