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/decoder.h>
31 /*****************************************************************************
33 *****************************************************************************/
34 static int Open( vlc_object_t * );
35 static void Close( vlc_object_t * );
38 set_description( _("AAC audio decoder (using libfaad2)") );
39 set_capability( "decoder", 100 );
40 set_category( CAT_INPUT );
41 set_subcategory( SUBCAT_INPUT_ACODEC );
42 set_callbacks( Open, Close );
45 /****************************************************************************
47 ****************************************************************************/
48 static aout_buffer_t *DecodeBlock( decoder_t *, block_t ** );
49 static void DoReordering( decoder_t *, uint32_t *, uint32_t *, int, int,
52 #define MAX_CHANNEL_POSITIONS 9
62 /* temporary buffer */
67 /* Channel positions of the current stream (for re-ordering) */
68 uint32_t pi_channel_positions[MAX_CHANNEL_POSITIONS];
71 static const uint32_t pi_channels_in[MAX_CHANNEL_POSITIONS] =
72 { FRONT_CHANNEL_CENTER, FRONT_CHANNEL_LEFT, FRONT_CHANNEL_RIGHT,
73 SIDE_CHANNEL_LEFT, SIDE_CHANNEL_RIGHT,
74 BACK_CHANNEL_LEFT, BACK_CHANNEL_RIGHT,
75 BACK_CHANNEL_CENTER, LFE_CHANNEL };
76 static const uint32_t pi_channels_out[MAX_CHANNEL_POSITIONS] =
77 { AOUT_CHAN_CENTER, AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT,
78 AOUT_CHAN_MIDDLELEFT, AOUT_CHAN_MIDDLERIGHT,
79 AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT,
80 AOUT_CHAN_REARCENTER, AOUT_CHAN_LFE };
81 static const uint32_t pi_channels_ordered[MAX_CHANNEL_POSITIONS] =
82 { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT,
83 AOUT_CHAN_MIDDLELEFT, AOUT_CHAN_MIDDLERIGHT,
84 AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT,
85 AOUT_CHAN_CENTER, AOUT_CHAN_REARCENTER, AOUT_CHAN_LFE
88 /*****************************************************************************
89 * OpenDecoder: probe the decoder and return score
90 *****************************************************************************/
91 static int Open( vlc_object_t *p_this )
93 decoder_t *p_dec = (decoder_t*)p_this;
94 decoder_sys_t *p_sys = p_dec->p_sys;
95 faacDecConfiguration *cfg;
97 if( p_dec->fmt_in.i_codec != VLC_FOURCC('m','p','4','a') )
102 /* Allocate the memory needed to store the decoder's structure */
103 if( ( p_dec->p_sys = p_sys =
104 (decoder_sys_t *)malloc(sizeof(decoder_sys_t)) ) == NULL )
106 msg_Err( p_dec, "out of memory" );
110 /* Open a faad context */
111 if( ( p_sys->hfaad = faacDecOpen() ) == NULL )
113 msg_Err( p_dec, "cannot initialize faad" );
118 aout_DateSet( &p_sys->date, 0 );
119 p_dec->fmt_out.i_cat = AUDIO_ES;
121 if (p_this->p_libvlc->i_cpu & CPU_CAPABILITY_FPU)
122 p_dec->fmt_out.i_codec = VLC_FOURCC('f','l','3','2');
124 p_dec->fmt_out.i_codec = AOUT_FMT_S16_NE;
125 p_dec->pf_decode_audio = DecodeBlock;
127 p_dec->fmt_out.audio.i_physical_channels =
128 p_dec->fmt_out.audio.i_original_channels = 0;
130 if( p_dec->fmt_in.i_extra > 0 )
132 /* We have a decoder config so init the handle */
133 unsigned long i_rate;
134 unsigned char i_channels;
136 if( faacDecInit2( p_sys->hfaad, p_dec->fmt_in.p_extra,
137 p_dec->fmt_in.i_extra,
138 &i_rate, &i_channels ) < 0 )
143 p_dec->fmt_out.audio.i_rate = i_rate;
144 p_dec->fmt_out.audio.i_channels = i_channels;
145 aout_DateInit( &p_sys->date, i_rate );
149 /* Will be initalised from first frame */
150 p_dec->fmt_out.audio.i_rate = 0;
151 p_dec->fmt_out.audio.i_channels = 0;
154 /* Set the faad config */
155 cfg = faacDecGetCurrentConfiguration( p_sys->hfaad );
156 if (p_this->p_libvlc->i_cpu & CPU_CAPABILITY_FPU)
157 cfg->outputFormat = FAAD_FMT_FLOAT;
159 cfg->outputFormat = FAAD_FMT_16BIT;
160 faacDecSetConfiguration( p_sys->hfaad, cfg );
163 p_sys->i_buffer = p_sys->i_buffer_size = 0;
166 /* Faad2 can't deal with truncated data (eg. from MPEG TS) */
167 p_dec->b_need_packetized = VLC_TRUE;
172 /*****************************************************************************
174 *****************************************************************************/
175 static aout_buffer_t *DecodeBlock( decoder_t *p_dec, block_t **pp_block )
177 decoder_sys_t *p_sys = p_dec->p_sys;
180 if( !pp_block || !*pp_block ) return NULL;
184 if( p_block->i_flags&(BLOCK_FLAG_DISCONTINUITY|BLOCK_FLAG_CORRUPTED) )
186 block_Release( p_block );
190 /* Append the block to the temporary buffer */
191 if( p_sys->i_buffer_size < p_sys->i_buffer + p_block->i_buffer )
193 p_sys->i_buffer_size = p_sys->i_buffer + p_block->i_buffer;
194 p_sys->p_buffer = realloc( p_sys->p_buffer, p_sys->i_buffer_size );
197 if( p_block->i_buffer )
199 memcpy( &p_sys->p_buffer[p_sys->i_buffer],
200 p_block->p_buffer, p_block->i_buffer );
201 p_sys->i_buffer += p_block->i_buffer;
202 p_block->i_buffer = 0;
205 if( p_dec->fmt_out.audio.i_rate == 0 && p_dec->fmt_in.i_extra > 0 )
207 /* We have a decoder config so init the handle */
208 unsigned long i_rate;
209 unsigned char i_channels;
211 if( faacDecInit2( p_sys->hfaad, p_dec->fmt_in.p_extra,
212 p_dec->fmt_in.i_extra,
213 &i_rate, &i_channels ) >= 0 )
215 p_dec->fmt_out.audio.i_rate = i_rate;
216 p_dec->fmt_out.audio.i_channels = i_channels;
217 aout_DateInit( &p_sys->date, i_rate );
221 if( p_dec->fmt_out.audio.i_rate == 0 && p_sys->i_buffer )
223 unsigned long i_rate;
224 unsigned char i_channels;
226 /* Init faad with the first frame */
227 if( faacDecInit( p_sys->hfaad,
228 p_sys->p_buffer, p_sys->i_buffer,
229 &i_rate, &i_channels ) < 0 )
231 block_Release( p_block );
235 p_dec->fmt_out.audio.i_rate = i_rate;
236 p_dec->fmt_out.audio.i_channels = i_channels;
237 aout_DateInit( &p_sys->date, i_rate );
240 if( p_block->i_pts != 0 && p_block->i_pts != aout_DateGet( &p_sys->date ) )
242 aout_DateSet( &p_sys->date, p_block->i_pts );
244 else if( !aout_DateGet( &p_sys->date ) )
246 /* We've just started the stream, wait for the first PTS. */
247 block_Release( p_block );
252 /* Decode all data */
253 if( p_sys->i_buffer )
256 faacDecFrameInfo frame;
257 aout_buffer_t *p_out;
260 samples = faacDecDecode( p_sys->hfaad, &frame,
261 p_sys->p_buffer, p_sys->i_buffer );
263 if( frame.error > 0 )
265 msg_Warn( p_dec, "%s", faacDecGetErrorMessage( frame.error ) );
267 /* Flush the buffer */
269 block_Release( p_block );
273 if( frame.channels <= 0 || frame.channels > 8 || frame.channels == 7 )
275 msg_Warn( p_dec, "invalid channels count: %i", frame.channels );
277 /* Flush the buffer */
278 p_sys->i_buffer -= frame.bytesconsumed;
279 if( p_sys->i_buffer > 0 )
281 memmove( p_sys->p_buffer,&p_sys->p_buffer[frame.bytesconsumed],
284 block_Release( p_block );
288 if( frame.samples <= 0 )
290 msg_Warn( p_dec, "decoded zero sample" );
292 /* Flush the buffer */
293 p_sys->i_buffer -= frame.bytesconsumed;
294 if( p_sys->i_buffer > 0 )
296 memmove( p_sys->p_buffer,&p_sys->p_buffer[frame.bytesconsumed],
299 block_Release( p_block );
303 /* We decoded a valid frame */
304 if( p_dec->fmt_out.audio.i_rate != frame.samplerate )
306 aout_DateInit( &p_sys->date, frame.samplerate );
307 aout_DateSet( &p_sys->date, p_block->i_pts );
309 p_block->i_pts = 0; /* PTS is valid only once */
311 p_dec->fmt_out.audio.i_rate = frame.samplerate;
312 p_dec->fmt_out.audio.i_channels = frame.channels;
315 /* Convert frame.channel_position to our own channel values */
316 for( i = 0; i < frame.channels; i++ )
318 /* Find the channel code */
319 for( j = 0; j < MAX_CHANNEL_POSITIONS; j++ )
321 if( frame.channel_position[i] == pi_channels_in[j] )
323 p_sys->pi_channel_positions[i] = pi_channels_out[j];
324 p_dec->fmt_out.audio.i_physical_channels |=
330 if( j == MAX_CHANNEL_POSITIONS )
332 msg_Warn( p_dec, "unknown channel ordering" );
333 block_Release( p_block );
337 p_dec->fmt_out.audio.i_original_channels =
338 p_dec->fmt_out.audio.i_physical_channels;
340 p_out = p_dec->pf_aout_buffer_new(p_dec, frame.samples/frame.channels);
344 block_Release( p_block );
348 p_out->start_date = aout_DateGet( &p_sys->date );
349 p_out->end_date = aout_DateIncrement( &p_sys->date,
350 frame.samples / frame.channels );
352 DoReordering( p_dec, (uint32_t *)p_out->p_buffer, samples,
353 frame.samples / frame.channels, frame.channels,
354 p_sys->pi_channel_positions );
356 p_sys->i_buffer -= frame.bytesconsumed;
357 if( p_sys->i_buffer > 0 )
359 memmove( p_sys->p_buffer, &p_sys->p_buffer[frame.bytesconsumed],
366 block_Release( p_block );
370 /*****************************************************************************
372 *****************************************************************************/
373 static void Close( vlc_object_t *p_this )
375 decoder_t *p_dec = (decoder_t *)p_this;
376 decoder_sys_t *p_sys = p_dec->p_sys;
378 faacDecClose( p_sys->hfaad );
382 /*****************************************************************************
383 * DoReordering: do some channel re-ordering (the ac3 channel order is
384 * different from the aac one).
385 *****************************************************************************/
386 static void DoReordering( decoder_t *p_dec,
387 uint32_t *p_out, uint32_t *p_in, int i_samples,
388 int i_nb_channels, uint32_t *pi_chan_positions )
390 int pi_chan_table[MAX_CHANNEL_POSITIONS];
393 /* Find the channels mapping */
394 for( i = 0, j = 0; i < MAX_CHANNEL_POSITIONS; i++ )
396 for( k = 0; k < i_nb_channels; k++ )
398 if( pi_channels_ordered[i] == pi_chan_positions[k] )
400 pi_chan_table[k] = j++;
406 /* Do the actual reordering */
407 if( p_dec->p_libvlc->i_cpu & CPU_CAPABILITY_FPU )
408 for( i = 0; i < i_samples; i++ )
409 for( j = 0; j < i_nb_channels; j++ )
410 p_out[i * i_nb_channels + pi_chan_table[j]] =
411 p_in[i * i_nb_channels + j];
413 for( i = 0; i < i_samples; i++ )
414 for( j = 0; j < i_nb_channels; j++ )
415 ((uint16_t *)p_out)[i * i_nb_channels + pi_chan_table[j]] =
416 ((uint16_t *)p_in)[i * i_nb_channels + j];