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;
74 static const uint32_t pi_channels_in[MAX_CHANNEL_POSITIONS] =
75 { FRONT_CHANNEL_CENTER, FRONT_CHANNEL_LEFT, FRONT_CHANNEL_RIGHT,
76 SIDE_CHANNEL_LEFT, SIDE_CHANNEL_RIGHT,
77 BACK_CHANNEL_LEFT, BACK_CHANNEL_RIGHT,
78 BACK_CHANNEL_CENTER, LFE_CHANNEL };
79 static const uint32_t pi_channels_out[MAX_CHANNEL_POSITIONS] =
80 { AOUT_CHAN_CENTER, AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT,
81 AOUT_CHAN_MIDDLELEFT, AOUT_CHAN_MIDDLERIGHT,
82 AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT,
83 AOUT_CHAN_REARCENTER, AOUT_CHAN_LFE };
84 static const uint32_t pi_channels_ordered[MAX_CHANNEL_POSITIONS] =
85 { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT,
86 AOUT_CHAN_MIDDLELEFT, AOUT_CHAN_MIDDLERIGHT,
87 AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT,
88 AOUT_CHAN_CENTER, AOUT_CHAN_REARCENTER, AOUT_CHAN_LFE
91 /*****************************************************************************
92 * OpenDecoder: probe the decoder and return score
93 *****************************************************************************/
94 static int Open( vlc_object_t *p_this )
96 decoder_t *p_dec = (decoder_t*)p_this;
97 decoder_sys_t *p_sys = p_dec->p_sys;
98 faacDecConfiguration *cfg;
100 if( p_dec->fmt_in.i_codec != VLC_FOURCC('m','p','4','a') )
105 /* Allocate the memory needed to store the decoder's structure */
106 if( ( p_dec->p_sys = p_sys =
107 (decoder_sys_t *)malloc(sizeof(decoder_sys_t)) ) == NULL )
109 msg_Err( p_dec, "out of memory" );
113 /* Open a faad context */
114 if( ( p_sys->hfaad = faacDecOpen() ) == NULL )
116 msg_Err( p_dec, "cannot initialize faad" );
121 aout_DateSet( &p_sys->date, 0 );
122 p_dec->fmt_out.i_cat = AUDIO_ES;
124 if (vlc_CPU() & CPU_CAPABILITY_FPU)
125 p_dec->fmt_out.i_codec = VLC_FOURCC('f','l','3','2');
127 p_dec->fmt_out.i_codec = AOUT_FMT_S16_NE;
128 p_dec->pf_decode_audio = DecodeBlock;
130 p_dec->fmt_out.audio.i_physical_channels =
131 p_dec->fmt_out.audio.i_original_channels = 0;
133 if( p_dec->fmt_in.i_extra > 0 )
135 /* We have a decoder config so init the handle */
136 unsigned long i_rate;
137 unsigned char i_channels;
139 if( faacDecInit2( p_sys->hfaad, p_dec->fmt_in.p_extra,
140 p_dec->fmt_in.i_extra,
141 &i_rate, &i_channels ) < 0 )
146 p_dec->fmt_out.audio.i_rate = i_rate;
147 p_dec->fmt_out.audio.i_channels = i_channels;
148 aout_DateInit( &p_sys->date, i_rate );
152 /* Will be initalised from first frame */
153 p_dec->fmt_out.audio.i_rate = 0;
154 p_dec->fmt_out.audio.i_channels = 0;
157 /* Set the faad config */
158 cfg = faacDecGetCurrentConfiguration( p_sys->hfaad );
159 if (vlc_CPU() & CPU_CAPABILITY_FPU)
160 cfg->outputFormat = FAAD_FMT_FLOAT;
162 cfg->outputFormat = FAAD_FMT_16BIT;
163 faacDecSetConfiguration( p_sys->hfaad, cfg );
166 p_sys->i_buffer = p_sys->i_buffer_size = 0;
169 /* Faad2 can't deal with truncated data (eg. from MPEG TS) */
170 p_dec->b_need_packetized = VLC_TRUE;
172 p_sys->b_sbr = p_sys->b_ps = VLC_FALSE;
176 /*****************************************************************************
178 *****************************************************************************/
179 static aout_buffer_t *DecodeBlock( decoder_t *p_dec, block_t **pp_block )
181 decoder_sys_t *p_sys = p_dec->p_sys;
184 if( !pp_block || !*pp_block ) return NULL;
188 if( p_block->i_flags&(BLOCK_FLAG_DISCONTINUITY|BLOCK_FLAG_CORRUPTED) )
190 block_Release( p_block );
194 /* Append the block to the temporary buffer */
195 if( p_sys->i_buffer_size < p_sys->i_buffer + p_block->i_buffer )
197 p_sys->i_buffer_size = p_sys->i_buffer + p_block->i_buffer;
198 p_sys->p_buffer = realloc( p_sys->p_buffer, p_sys->i_buffer_size );
201 if( p_block->i_buffer )
203 memcpy( &p_sys->p_buffer[p_sys->i_buffer],
204 p_block->p_buffer, p_block->i_buffer );
205 p_sys->i_buffer += p_block->i_buffer;
206 p_block->i_buffer = 0;
209 if( p_dec->fmt_out.audio.i_rate == 0 && p_dec->fmt_in.i_extra > 0 )
211 /* We have a decoder config so init the handle */
212 unsigned long i_rate;
213 unsigned char i_channels;
215 if( faacDecInit2( p_sys->hfaad, p_dec->fmt_in.p_extra,
216 p_dec->fmt_in.i_extra,
217 &i_rate, &i_channels ) >= 0 )
219 p_dec->fmt_out.audio.i_rate = i_rate;
220 p_dec->fmt_out.audio.i_channels = i_channels;
221 aout_DateInit( &p_sys->date, i_rate );
225 if( p_dec->fmt_out.audio.i_rate == 0 && p_sys->i_buffer )
227 unsigned long i_rate;
228 unsigned char i_channels;
230 /* Init faad with the first frame */
231 if( faacDecInit( p_sys->hfaad,
232 p_sys->p_buffer, p_sys->i_buffer,
233 &i_rate, &i_channels ) < 0 )
235 block_Release( p_block );
239 p_dec->fmt_out.audio.i_rate = i_rate;
240 p_dec->fmt_out.audio.i_channels = i_channels;
241 aout_DateInit( &p_sys->date, i_rate );
244 if( p_block->i_pts != 0 && p_block->i_pts != aout_DateGet( &p_sys->date ) )
246 aout_DateSet( &p_sys->date, p_block->i_pts );
248 else if( !aout_DateGet( &p_sys->date ) )
250 /* We've just started the stream, wait for the first PTS. */
251 block_Release( p_block );
256 /* Decode all data */
257 if( p_sys->i_buffer )
260 faacDecFrameInfo frame;
261 aout_buffer_t *p_out;
264 samples = faacDecDecode( p_sys->hfaad, &frame,
265 p_sys->p_buffer, p_sys->i_buffer );
267 if( frame.error > 0 )
269 msg_Warn( p_dec, "%s", faacDecGetErrorMessage( frame.error ) );
271 /* Flush the buffer */
273 block_Release( p_block );
277 if( frame.channels <= 0 || frame.channels > 8 || frame.channels == 7 )
279 msg_Warn( p_dec, "invalid channels count: %i", frame.channels );
281 /* Flush the buffer */
282 p_sys->i_buffer -= frame.bytesconsumed;
283 if( p_sys->i_buffer > 0 )
285 memmove( p_sys->p_buffer,&p_sys->p_buffer[frame.bytesconsumed],
288 block_Release( p_block );
292 if( frame.samples <= 0 )
294 msg_Warn( p_dec, "decoded zero sample" );
296 /* Flush the buffer */
297 p_sys->i_buffer -= frame.bytesconsumed;
298 if( p_sys->i_buffer > 0 )
300 memmove( p_sys->p_buffer,&p_sys->p_buffer[frame.bytesconsumed],
303 block_Release( p_block );
307 /* We decoded a valid frame */
308 if( p_dec->fmt_out.audio.i_rate != frame.samplerate )
310 aout_DateInit( &p_sys->date, frame.samplerate );
311 aout_DateSet( &p_sys->date, p_block->i_pts );
313 p_block->i_pts = 0; /* PTS is valid only once */
315 p_dec->fmt_out.audio.i_rate = frame.samplerate;
316 p_dec->fmt_out.audio.i_channels = frame.channels;
318 /* Adjust stream info when dealing with SBR/PS */
319 if( (p_sys->b_sbr != frame.sbr || p_sys->b_ps != frame.ps) &&
320 p_dec->p_parent->i_object_type == VLC_OBJECT_INPUT )
322 input_thread_t *p_input = (input_thread_t *)p_dec->p_parent;
324 const char *psz_ext = (frame.sbr && frame.ps) ? "SBR+PS" :
325 frame.sbr ? "SBR" : "PS";
327 msg_Dbg( p_dec, "AAC %s (channels: %u, samplerate: %lu)",
328 psz_ext, frame.channels, frame.samplerate );
330 asprintf( &psz_cat, _("Stream %d"), p_dec->fmt_in.i_id );
331 input_Control( p_input, INPUT_ADD_INFO, psz_cat,
332 _("AAC extension"), "%s", psz_ext );
333 input_Control( p_input, INPUT_ADD_INFO, psz_cat,
334 _("Channels"), "%d", frame.channels );
335 input_Control( p_input, INPUT_ADD_INFO, psz_cat,
336 _("Sample rate"), _("%d Hz"), frame.samplerate );
338 p_sys->b_sbr = frame.sbr; p_sys->b_ps = frame.ps;
341 /* Convert frame.channel_position to our own channel values */
342 p_dec->fmt_out.audio.i_physical_channels = 0;
343 for( i = 0; i < frame.channels; i++ )
345 /* Find the channel code */
346 for( j = 0; j < MAX_CHANNEL_POSITIONS; j++ )
348 if( frame.channel_position[i] == pi_channels_in[j] )
351 if( j >= MAX_CHANNEL_POSITIONS )
353 msg_Warn( p_dec, "unknown channel ordering" );
354 /* Invent something */
358 p_sys->pi_channel_positions[i] = pi_channels_out[j];
359 if( p_dec->fmt_out.audio.i_physical_channels & pi_channels_out[j] )
360 frame.channels--; /* We loose a duplicated channel */
362 p_dec->fmt_out.audio.i_physical_channels |= pi_channels_out[j];
364 p_dec->fmt_out.audio.i_original_channels =
365 p_dec->fmt_out.audio.i_physical_channels;
367 p_out = p_dec->pf_aout_buffer_new(p_dec, frame.samples/frame.channels);
371 block_Release( p_block );
375 p_out->start_date = aout_DateGet( &p_sys->date );
376 p_out->end_date = aout_DateIncrement( &p_sys->date,
377 frame.samples / frame.channels );
379 DoReordering( p_dec, (uint32_t *)p_out->p_buffer, samples,
380 frame.samples / frame.channels, frame.channels,
381 p_sys->pi_channel_positions );
383 p_sys->i_buffer -= frame.bytesconsumed;
384 if( p_sys->i_buffer > 0 )
386 memmove( p_sys->p_buffer, &p_sys->p_buffer[frame.bytesconsumed],
393 block_Release( p_block );
397 /*****************************************************************************
399 *****************************************************************************/
400 static void Close( vlc_object_t *p_this )
402 decoder_t *p_dec = (decoder_t *)p_this;
403 decoder_sys_t *p_sys = p_dec->p_sys;
405 faacDecClose( p_sys->hfaad );
406 if( p_sys->p_buffer ) free( p_sys->p_buffer );
410 /*****************************************************************************
411 * DoReordering: do some channel re-ordering (the ac3 channel order is
412 * different from the aac one).
413 *****************************************************************************/
414 static void DoReordering( decoder_t *p_dec,
415 uint32_t *p_out, uint32_t *p_in, int i_samples,
416 int i_nb_channels, uint32_t *pi_chan_positions )
418 int pi_chan_table[MAX_CHANNEL_POSITIONS];
421 /* Find the channels mapping */
422 for( k = 0, j = 0; k < i_nb_channels; k++ )
424 for( i = 0; i < MAX_CHANNEL_POSITIONS; i++ )
426 if( pi_channels_ordered[i] == pi_chan_positions[k] )
428 pi_chan_table[k] = j++;
434 /* Do the actual reordering */
435 if( vlc_CPU() & CPU_CAPABILITY_FPU )
436 for( i = 0; i < i_samples; i++ )
437 for( j = 0; j < i_nb_channels; j++ )
438 p_out[i * i_nb_channels + pi_chan_table[j]] =
439 p_in[i * i_nb_channels + j];
441 for( i = 0; i < i_samples; i++ )
442 for( j = 0; j < i_nb_channels; j++ )
443 ((uint16_t *)p_out)[i * i_nb_channels + pi_chan_table[j]] =
444 ((uint16_t *)p_in)[i * i_nb_channels + j];