1 /*****************************************************************************
2 * araw.c: Pseudo audio decoder; for raw pcm data
3 *****************************************************************************
4 * Copyright (C) 2001, 2002 VideoLAN
5 * $Id: araw.c,v 1.1 2002/10/14 21:59:44 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 );
87 /*****************************************************************************
88 * OpenDecoder: probe the decoder and return score
89 *****************************************************************************
90 * Tries to launch a decoder and return score so that the interface is able
92 *****************************************************************************/
93 static int OpenDecoder( vlc_object_t *p_this )
95 decoder_fifo_t *p_fifo = (decoder_fifo_t*) p_this;
97 switch( p_fifo->i_fourcc )
99 case VLC_FOURCC('a','r','a','w'):
100 case VLC_FOURCC('t','w','o','s'): /* for mov file */
101 p_fifo->pf_run = RunDecoder;
110 /*****************************************************************************
111 * RunDecoder: this function is called just after the thread is created
112 *****************************************************************************/
113 static int RunDecoder( decoder_fifo_t *p_fifo )
115 adec_thread_t *p_adec;
118 if( !( p_adec = malloc( sizeof( adec_thread_t ) ) ) )
120 msg_Err( p_fifo, "out of memory" );
121 DecoderError( p_fifo );
124 memset( p_adec, 0, sizeof( adec_thread_t ) );
126 p_adec->p_fifo = p_fifo;
128 if( InitThread( p_adec ) != 0 )
130 DecoderError( p_fifo );
134 while( ( !p_adec->p_fifo->b_die )&&( !p_adec->p_fifo->b_error ) )
136 DecodeThread( p_adec );
140 if( ( b_error = p_adec->p_fifo->b_error ) )
142 DecoderError( p_adec->p_fifo );
155 #define FREE( p ) if( p ) free( p ); p = NULL
156 #define GetWLE( p ) \
157 ( *(u8*)(p) + ( *((u8*)(p)+1) << 8 ) )
159 #define GetDWLE( p ) \
160 ( *(u8*)(p) + ( *((u8*)(p)+1) << 8 ) + \
161 ( *((u8*)(p)+2) << 16 ) + ( *((u8*)(p)+3) << 24 ) )
163 static void GetWaveFormatEx( waveformatex_t *p_wh,
167 p_wh->i_formattag = GetWLE( p_data );
168 p_wh->i_channels = GetWLE( p_data + 2 );
169 p_wh->i_samplespersec = GetDWLE( p_data + 4 );
170 p_wh->i_avgbytespersec= GetDWLE( p_data + 8 );
171 p_wh->i_blockalign = GetWLE( p_data + 12 );
172 p_wh->i_bitspersample = GetWLE( p_data + 14 );
173 if( p_wh->i_formattag != 1 )
175 p_wh->i_size = GetWLE( p_data + 16 );
179 p_wh->p_data = malloc( p_wh->i_size );
180 memcpy( p_wh->p_data, p_data + 18, p_wh->i_size );
185 /* get the first pes from fifo */
186 static pes_packet_t *PESGetFirst( decoder_fifo_t *p_fifo )
190 vlc_mutex_lock( &p_fifo->data_lock );
192 /* if fifo is empty wait */
193 while( !p_fifo->p_first )
197 vlc_mutex_unlock( &p_fifo->data_lock );
200 vlc_cond_wait( &p_fifo->data_wait, &p_fifo->data_lock );
202 p_pes = p_fifo->p_first;
204 vlc_mutex_unlock( &p_fifo->data_lock );
208 static int PESGetSize( pes_packet_t *p_pes )
210 data_packet_t *p_data;
218 for( p_data = p_pes->p_first; p_data != NULL; p_data = p_data->p_next )
220 i_size += p_data->p_payload_end - p_data->p_payload_start;
226 /*****************************************************************************
227 * InitThread: initialize data before entering main loop
228 *****************************************************************************/
229 static int InitThread( adec_thread_t * p_adec )
232 if( p_adec->p_fifo->p_demux_data )
234 GetWaveFormatEx( &p_adec->format,
235 (u8*)p_adec->p_fifo->p_demux_data );
236 /* fixing some values */
237 if( p_adec->format.i_formattag == 1 && !p_adec->format.i_blockalign )
239 p_adec->format.i_blockalign = p_adec->format.i_channels *
240 ( ( p_adec->format.i_bitspersample + 7 ) / 8 );
245 msg_Err( p_adec->p_fifo, "unknown raw format" );
249 msg_Dbg( p_adec->p_fifo,
250 "raw format: samplerate:%dHz channels:%d bits/sample:%d blockalign:%d",
251 p_adec->format.i_samplespersec,
252 p_adec->format.i_channels,
253 p_adec->format.i_bitspersample, p_adec->format.i_blockalign );
255 /* Initialize the thread properties */
256 switch( ( p_adec->format.i_bitspersample + 7 ) / 8 )
259 p_adec->output_format.i_format = VLC_FOURCC('s','1','6','l');
262 p_adec->output_format.i_format = VLC_FOURCC('s','2','4','l');
265 p_adec->output_format.i_format = VLC_FOURCC('s','3','2','l');
270 msg_Err( p_adec->p_fifo, "bad parameters(bits/sample)" );
273 p_adec->output_format.i_rate = p_adec->format.i_samplespersec;
274 p_adec->output_format.i_channels = p_adec->format.i_channels;
275 p_adec->p_aout = NULL;
276 p_adec->p_aout_input = NULL;
278 /* **** Create a new audio output **** */
279 aout_DateInit( &p_adec->date, p_adec->output_format.i_rate );
280 p_adec->p_aout_input = aout_DecNew( p_adec->p_fifo,
282 &p_adec->output_format );
283 if( !p_adec->p_aout_input )
285 msg_Err( p_adec->p_fifo, "cannot create aout" );
289 /* Init the BitStream */
290 InitBitstream( &p_adec->bit_stream, p_adec->p_fifo,
296 /*****************************************************************************
297 * DecodeThread: decodes a frame
298 *****************************************************************************/
299 static void DecodeThread( adec_thread_t *p_adec )
301 aout_buffer_t *p_aout_buffer;
302 int i_samples; // per channels
306 /* **** get samples count **** */
307 p_pes = PESGetFirst( p_adec->p_fifo );
309 i_size = PESGetSize( p_pes );
310 if( p_adec->format.i_blockalign > 0 )
312 i_size -= i_size % p_adec->format.i_blockalign;
314 i_size = __MAX( i_size, p_adec->format.i_blockalign );
316 if( !i_size || !p_pes )
318 msg_Err( p_adec->p_fifo, "infinite loop..." );
322 ( ( p_adec->format.i_bitspersample + 7 ) / 8 ) /
323 p_adec->format.i_channels;
325 // msg_Warn( p_adec->p_fifo, "got %d samples (%d bytes)", i_samples, i_size );
326 p_adec->pts = p_pes->i_pts;
328 /* **** Now we can output these samples **** */
330 if( p_adec->pts != 0 && p_adec->pts != aout_DateGet( &p_adec->date ) )
332 aout_DateSet( &p_adec->date, p_adec->pts );
334 else if( !aout_DateGet( &p_adec->date ) )
339 p_aout_buffer = aout_DecNewBuffer( p_adec->p_aout,
340 p_adec->p_aout_input,
344 msg_Err( p_adec->p_fifo, "cannot get aout buffer" );
345 p_adec->p_fifo->b_error = 1;
349 p_aout_buffer->start_date = aout_DateGet( &p_adec->date );
350 p_aout_buffer->end_date = aout_DateIncrement( &p_adec->date,
352 GetChunk( &p_adec->bit_stream,
353 p_aout_buffer->p_buffer,
354 p_aout_buffer->i_nb_bytes );
356 aout_DecPlay( p_adec->p_aout, p_adec->p_aout_input, p_aout_buffer );
360 /*****************************************************************************
361 * EndThread : faad decoder thread destruction
362 *****************************************************************************/
363 static void EndThread (adec_thread_t *p_adec)
365 if( p_adec->p_aout_input )
367 aout_DecDelete( p_adec->p_aout, p_adec->p_aout_input );
370 FREE( p_adec->format.p_data );
372 msg_Dbg( p_adec->p_fifo, "raw audio decoder closed" );