1 /*****************************************************************************
2 * araw.c: Pseudo audio decoder; for raw pcm data
3 *****************************************************************************
4 * Copyright (C) 2001, 2002 VideoLAN
5 * $Id: araw.c,v 1.2 2002/10/20 17:44:17 fenrir Exp $
7 * Authors: Laurent Aimar <fenrir@via.ecp.fr>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
22 *****************************************************************************/
24 /*****************************************************************************
26 *****************************************************************************/
29 #include <vlc/decoder.h>
30 #include <vlc/input.h>
32 #include <stdlib.h> /* malloc(), free() */
33 #include <string.h> /* strdup() */
35 /*****************************************************************************
37 *****************************************************************************/
38 typedef struct waveformatex_s
46 u16 i_size; /* the extra size in bytes */
47 u8 *p_data; /* The extra data */
50 typedef struct adec_thread_s
52 waveformatex_t format;
54 /* The bit stream structure handles the PES stream at the bit level */
55 bit_stream_t bit_stream;
57 /* Input properties */
58 decoder_fifo_t *p_fifo;
60 /* Output properties */
61 aout_instance_t * p_aout; /* opaque */
62 aout_input_t * p_aout_input; /* opaque */
63 audio_sample_format_t output_format;
70 static int OpenDecoder ( vlc_object_t * );
72 static int RunDecoder ( decoder_fifo_t * );
73 static int InitThread ( adec_thread_t * );
74 static void DecodeThread ( adec_thread_t * );
75 static void EndThread ( adec_thread_t * );
77 /*****************************************************************************
79 *****************************************************************************/
82 set_description( _("Pseudo Raw Audio decoder") );
83 set_capability( "decoder", 50 );
84 set_callbacks( OpenDecoder, NULL );
88 static int i_channels_maps[6] =
91 AOUT_CHAN_MONO, AOUT_CHAN_STEREO,
92 AOUT_CHAN_3F, AOUT_CHAN_2F2R,
96 /*****************************************************************************
97 * OpenDecoder: probe the decoder and return score
98 *****************************************************************************
99 * Tries to launch a decoder and return score so that the interface is able
101 *****************************************************************************/
102 static int OpenDecoder( vlc_object_t *p_this )
104 decoder_fifo_t *p_fifo = (decoder_fifo_t*) p_this;
106 switch( p_fifo->i_fourcc )
108 case VLC_FOURCC('a','r','a','w'):
109 case VLC_FOURCC('t','w','o','s'): /* for mov file */
110 p_fifo->pf_run = RunDecoder;
119 /*****************************************************************************
120 * RunDecoder: this function is called just after the thread is created
121 *****************************************************************************/
122 static int RunDecoder( decoder_fifo_t *p_fifo )
124 adec_thread_t *p_adec;
127 if( !( p_adec = malloc( sizeof( adec_thread_t ) ) ) )
129 msg_Err( p_fifo, "out of memory" );
130 DecoderError( p_fifo );
133 memset( p_adec, 0, sizeof( adec_thread_t ) );
135 p_adec->p_fifo = p_fifo;
137 if( InitThread( p_adec ) != 0 )
139 DecoderError( p_fifo );
143 while( ( !p_adec->p_fifo->b_die )&&( !p_adec->p_fifo->b_error ) )
145 DecodeThread( p_adec );
149 if( ( b_error = p_adec->p_fifo->b_error ) )
151 DecoderError( p_adec->p_fifo );
164 #define FREE( p ) if( p ) free( p ); p = NULL
165 #define GetWLE( p ) \
166 ( *(u8*)(p) + ( *((u8*)(p)+1) << 8 ) )
168 #define GetDWLE( p ) \
169 ( *(u8*)(p) + ( *((u8*)(p)+1) << 8 ) + \
170 ( *((u8*)(p)+2) << 16 ) + ( *((u8*)(p)+3) << 24 ) )
172 static void GetWaveFormatEx( waveformatex_t *p_wh,
176 p_wh->i_formattag = GetWLE( p_data );
177 p_wh->i_channels = GetWLE( p_data + 2 );
178 p_wh->i_samplespersec = GetDWLE( p_data + 4 );
179 p_wh->i_avgbytespersec= GetDWLE( p_data + 8 );
180 p_wh->i_blockalign = GetWLE( p_data + 12 );
181 p_wh->i_bitspersample = GetWLE( p_data + 14 );
182 if( p_wh->i_formattag != 1 )
184 p_wh->i_size = GetWLE( p_data + 16 );
188 p_wh->p_data = malloc( p_wh->i_size );
189 memcpy( p_wh->p_data, p_data + 18, p_wh->i_size );
194 /* get the first pes from fifo */
195 static pes_packet_t *PESGetFirst( decoder_fifo_t *p_fifo )
199 vlc_mutex_lock( &p_fifo->data_lock );
201 /* if fifo is empty wait */
202 while( !p_fifo->p_first )
206 vlc_mutex_unlock( &p_fifo->data_lock );
209 vlc_cond_wait( &p_fifo->data_wait, &p_fifo->data_lock );
211 p_pes = p_fifo->p_first;
213 vlc_mutex_unlock( &p_fifo->data_lock );
217 static int PESGetSize( pes_packet_t *p_pes )
219 data_packet_t *p_data;
227 for( p_data = p_pes->p_first; p_data != NULL; p_data = p_data->p_next )
229 i_size += p_data->p_payload_end - p_data->p_payload_start;
236 /*****************************************************************************
237 * InitThread: initialize data before entering main loop
238 *****************************************************************************/
240 static int InitThread( adec_thread_t * p_adec )
243 if( p_adec->p_fifo->p_demux_data )
245 GetWaveFormatEx( &p_adec->format,
246 (u8*)p_adec->p_fifo->p_demux_data );
247 /* fixing some values */
248 if( p_adec->format.i_formattag == 1 && !p_adec->format.i_blockalign )
250 p_adec->format.i_blockalign = p_adec->format.i_channels *
251 ( ( p_adec->format.i_bitspersample + 7 ) / 8 );
256 msg_Err( p_adec->p_fifo, "unknown raw format" );
260 msg_Dbg( p_adec->p_fifo,
261 "raw format: samplerate:%dHz channels:%d bits/sample:%d blockalign:%d",
262 p_adec->format.i_samplespersec,
263 p_adec->format.i_channels,
264 p_adec->format.i_bitspersample, p_adec->format.i_blockalign );
266 /* Initialize the thread properties */
267 switch( ( p_adec->format.i_bitspersample + 7 ) / 8 )
270 p_adec->output_format.i_format = VLC_FOURCC('s','1','6','l');
273 p_adec->output_format.i_format = VLC_FOURCC('s','2','4','l');
276 p_adec->output_format.i_format = VLC_FOURCC('s','3','2','l');
281 msg_Err( p_adec->p_fifo, "bad parameters(bits/sample)" );
284 p_adec->output_format.i_rate = p_adec->format.i_samplespersec;
285 if( p_adec->output_format.i_channels <= 0 ||
286 p_adec->output_format.i_channels > 5 )
288 msg_Err( p_adec->p_fifo, "bad channels count(1-5)" );
292 p_adec->output_format.i_channels =
293 i_channels_maps[p_adec->format.i_channels];
294 p_adec->p_aout = NULL;
295 p_adec->p_aout_input = NULL;
297 /* **** Create a new audio output **** */
298 aout_DateInit( &p_adec->date, p_adec->output_format.i_rate );
299 p_adec->p_aout_input = aout_DecNew( p_adec->p_fifo,
301 &p_adec->output_format );
302 if( !p_adec->p_aout_input )
304 msg_Err( p_adec->p_fifo, "cannot create aout" );
308 /* Init the BitStream */
309 InitBitstream( &p_adec->bit_stream, p_adec->p_fifo,
315 /*****************************************************************************
316 * DecodeThread: decodes a frame
317 *****************************************************************************/
318 static void DecodeThread( adec_thread_t *p_adec )
320 aout_buffer_t *p_aout_buffer;
321 int i_samples; // per channels
325 /* **** get samples count **** */
326 p_pes = PESGetFirst( p_adec->p_fifo );
328 i_size = PESGetSize( p_pes );
329 if( p_adec->format.i_blockalign > 0 )
331 i_size -= i_size % p_adec->format.i_blockalign;
333 i_size = __MAX( i_size, p_adec->format.i_blockalign );
335 if( !i_size || !p_pes )
337 msg_Err( p_adec->p_fifo, "infinite loop..." );
341 ( ( p_adec->format.i_bitspersample + 7 ) / 8 ) /
342 p_adec->format.i_channels;
344 // msg_Warn( p_adec->p_fifo, "got %d samples (%d bytes)", i_samples, i_size );
345 p_adec->pts = p_pes->i_pts;
347 /* **** Now we can output these samples **** */
349 if( p_adec->pts != 0 && p_adec->pts != aout_DateGet( &p_adec->date ) )
351 aout_DateSet( &p_adec->date, p_adec->pts );
353 else if( !aout_DateGet( &p_adec->date ) )
358 p_aout_buffer = aout_DecNewBuffer( p_adec->p_aout,
359 p_adec->p_aout_input,
363 msg_Err( p_adec->p_fifo, "cannot get aout buffer" );
364 p_adec->p_fifo->b_error = 1;
368 p_aout_buffer->start_date = aout_DateGet( &p_adec->date );
369 p_aout_buffer->end_date = aout_DateIncrement( &p_adec->date,
371 GetChunk( &p_adec->bit_stream,
372 p_aout_buffer->p_buffer,
373 p_aout_buffer->i_nb_bytes );
375 aout_DecPlay( p_adec->p_aout, p_adec->p_aout_input, p_aout_buffer );
379 /*****************************************************************************
380 * EndThread : faad decoder thread destruction
381 *****************************************************************************/
382 static void EndThread (adec_thread_t *p_adec)
384 if( p_adec->p_aout_input )
386 aout_DecDelete( p_adec->p_aout, p_adec->p_aout_input );
389 FREE( p_adec->format.p_data );
391 msg_Dbg( p_adec->p_fifo, "raw audio decoder closed" );