1 /*****************************************************************************
2 * ac3_spdif.c: ac3 pass-through to external decoder with enabled soundcard
3 *****************************************************************************
4 * Copyright (C) 2001 VideoLAN
5 * $Id: ac3_spdif.c,v 1.3 2001/05/06 04:32:02 sam Exp $
7 * Authors: Stéphane Borel <stef@via.ecp.fr>
8 * Juha Yrjola <jyrjola@cc.hut.fi>
9 * German Gomez Garcia <german@piraos.com>
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
24 *****************************************************************************/
26 /*****************************************************************************
28 *****************************************************************************/
33 #include <string.h> /* memcpy() */
42 #include "intf_msg.h" /* intf_DbgMsg(), intf_ErrMsg() */
44 #include "stream_control.h"
45 #include "input_ext-dec.h"
47 #include "audio_output.h"
49 #include "ac3_spdif.h"
50 #include "ac3_iec958.h"
54 /****************************************************************************
56 ****************************************************************************/
57 static int InitThread ( ac3_spdif_thread_t * );
58 static void RunThread ( ac3_spdif_thread_t * );
59 static void ErrorThread ( ac3_spdif_thread_t * );
60 static void EndThread ( ac3_spdif_thread_t * );
61 static void BitstreamCallback( bit_stream_t *, boolean_t );
63 /****************************************************************************
64 * spdif_CreateThread: initialize the spdif thread
65 ****************************************************************************/
66 vlc_thread_t spdif_CreateThread( adec_config_t * p_config )
68 ac3_spdif_thread_t * p_spdif;
70 intf_DbgMsg( "spdif debug: creating ac3 pass-through thread" );
72 /* Allocate the memory needed to store the thread's structure */
73 p_spdif = malloc( sizeof(ac3_spdif_thread_t) );
77 intf_ErrMsg ( "spdif error: not enough memory "
78 "for spdif_CreateThread() to create the new thread");
82 /* Temporary buffer to store ac3 frames to be transformed */
83 p_spdif->p_ac3 = malloc( /*ac3_info.i_frame_size*/SPDIF_FRAME_SIZE );
85 if( p_spdif->p_ac3 == NULL )
87 free( p_spdif->p_ac3 );
92 * Initialize the thread properties
94 p_spdif->p_config = p_config;
95 p_spdif->p_fifo = p_config->decoder_config.p_decoder_fifo;
97 p_spdif->p_aout_fifo = NULL;
99 /* Spawn the ac3 to spdif thread */
100 if (vlc_thread_create(&p_spdif->thread_id, "spdif",
101 (vlc_thread_func_t)RunThread, (void *)p_spdif))
103 intf_ErrMsg( "spdif error: can't spawn spdif thread" );
104 free( p_spdif->p_ac3 );
109 intf_DbgMsg( "spdif debug: spdif thread (%p) created", p_spdif );
111 return p_spdif->thread_id;
118 /****************************************************************************
119 * InitThread: initialize thread data and create output fifo
120 ****************************************************************************/
121 static int InitThread( ac3_spdif_thread_t * p_spdif )
123 p_spdif->p_config->decoder_config.pf_init_bit_stream(
124 &p_spdif->bit_stream,
125 p_spdif->p_config->decoder_config.p_decoder_fifo,
126 BitstreamCallback, (void*)p_spdif );
128 /* Creating the audio output fifo */
129 p_spdif->p_aout_fifo = aout_CreateFifo( AOUT_ADEC_SPDIF_FIFO, 1, 0, 0,
130 SPDIF_FRAME_SIZE, NULL );
132 if( p_spdif->p_aout_fifo == NULL )
137 intf_WarnMsg( 1, "spdif: aout fifo created" );
139 /* Check stream properties */
140 if( ac3_iec958_parse_syncinfo( p_spdif ) < 0 )
142 intf_ErrMsg( "spdif error: stream not valid");
144 aout_DestroyFifo( p_spdif->p_aout_fifo );
148 /* Check that we can handle the rate */
149 if( p_spdif->ac3_info.i_sample_rate != 48000 )
151 intf_ErrMsg( "spdif error: Only 48000 Hz streams supported");
153 aout_DestroyFifo( p_spdif->p_aout_fifo );
157 GetChunk( &p_spdif->bit_stream, p_spdif->p_ac3 + sizeof(sync_frame_t),
158 p_spdif->ac3_info.i_frame_size - sizeof(sync_frame_t) );
160 vlc_cond_signal( &p_spdif->p_aout_fifo->data_wait );
165 /****************************************************************************
166 * RunThread: loop that reads ac3 ES and transform it to
167 * an spdif compliant stream.
168 ****************************************************************************/
169 static void RunThread( ac3_spdif_thread_t * p_spdif )
171 /* Initializing the spdif decoder thread */
172 if( InitThread( p_spdif ) )
174 p_spdif->p_fifo->b_error = 1;
177 while( !p_spdif->p_fifo->b_die && !p_spdif->p_fifo->b_error )
179 /* Handle the dates */
180 if(DECODER_FIFO_START(*p_spdif->p_fifo)->i_pts)
182 p_spdif->p_aout_fifo->date[p_spdif->p_aout_fifo->l_end_frame] =
183 DECODER_FIFO_START(*p_spdif->p_fifo)->i_pts;
184 DECODER_FIFO_START(*p_spdif->p_fifo)->i_pts = 0;
188 p_spdif->p_aout_fifo->date[p_spdif->p_aout_fifo->l_end_frame] =
192 /* Write in the first free packet of aout fifo */
193 p_spdif->p_iec = (p_spdif->p_aout_fifo->buffer) +
194 (p_spdif->p_aout_fifo->l_end_frame * SPDIF_FRAME_SIZE );
196 /* Build burst to be sent to hardware decoder */
197 ac3_iec958_build_burst( p_spdif );
199 vlc_mutex_lock (&p_spdif->p_aout_fifo->data_lock);
201 p_spdif->p_aout_fifo->l_end_frame =
202 (p_spdif->p_aout_fifo->l_end_frame + 1 ) & AOUT_FIFO_SIZE;
204 vlc_mutex_unlock (&p_spdif->p_aout_fifo->data_lock);
207 while( ShowBits( &p_spdif->bit_stream, 16 ) != 0xb77 )
209 RemoveBits( &p_spdif->bit_stream, 8 );
212 /* Read data from bitstream */
213 GetChunk( &p_spdif->bit_stream, p_spdif->p_ac3,
214 p_spdif->ac3_info.i_frame_size );
217 /* If b_error is set, the ac3 spdif thread enters the error loop */
218 if( p_spdif->p_fifo->b_error )
220 ErrorThread( p_spdif );
223 /* End of the ac3 decoder thread */
224 EndThread( p_spdif );
229 /*****************************************************************************
230 * ErrorThread : ac3 spdif's RunThread() error loop
231 *****************************************************************************/
232 static void ErrorThread( ac3_spdif_thread_t * p_spdif )
234 /* We take the lock, because we are going to read/write the start/end
235 * indexes of the decoder fifo */
236 vlc_mutex_lock (&p_spdif->p_fifo->data_lock);
238 /* Wait until a `die' order is sent */
239 while( !p_spdif->p_fifo->b_die )
241 /* Trash all received PES packets */
242 while( !DECODER_FIFO_ISEMPTY( *p_spdif->p_fifo ) )
244 p_spdif->p_fifo->pf_delete_pes(p_spdif->p_fifo->p_packets_mgt,
245 DECODER_FIFO_START( *p_spdif->p_fifo ) );
246 DECODER_FIFO_INCSTART( *p_spdif->p_fifo );
249 /* Waiting for the input thread to put new PES packets in the fifo */
250 vlc_cond_wait( &p_spdif->p_fifo->data_wait,
251 &p_spdif->p_fifo->data_lock );
254 /* We can release the lock before leaving */
255 vlc_mutex_unlock( &p_spdif->p_fifo->data_lock );
258 /*****************************************************************************
259 * EndThread : ac3 spdif thread destruction
260 *****************************************************************************/
261 static void EndThread( ac3_spdif_thread_t * p_spdif )
263 intf_DbgMsg( "spdif debug: destroying thread %p", p_spdif );
265 /* If the audio output fifo was created, we destroy it */
266 if( p_spdif->p_aout_fifo != NULL )
268 aout_DestroyFifo( p_spdif->p_aout_fifo );
270 /* Make sure the output thread leaves the NextFrame() function */
271 vlc_mutex_lock( &(p_spdif->p_aout_fifo->data_lock ) );
272 vlc_cond_signal( &(p_spdif->p_aout_fifo->data_wait ) );
273 vlc_mutex_unlock( &(p_spdif->p_aout_fifo->data_lock ) );
277 /* Destroy descriptor */
278 free( p_spdif->p_config );
279 free( p_spdif->p_ac3 );
282 intf_DbgMsg ("spdif debug: thread %p destroyed", p_spdif );
285 /*****************************************************************************
286 * BitstreamCallback: Import parameters from the new data/PES packet
287 *****************************************************************************
288 * This function is called by input's NextDataPacket.
289 *****************************************************************************/
290 static void BitstreamCallback ( bit_stream_t * p_bit_stream,
295 p_bit_stream->p_byte += 3;