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 1.5 2001/05/07 03:14:09 stef 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( 3, "spdif: aout fifo #%d created",
138 p_spdif->p_aout_fifo->i_fifo );
140 /* Check stream properties */
141 if( ac3_iec958_parse_syncinfo( p_spdif ) < 0 )
143 intf_ErrMsg( "spdif error: stream not valid");
145 aout_DestroyFifo( p_spdif->p_aout_fifo );
149 /* Check that we can handle the rate */
150 if( p_spdif->ac3_info.i_sample_rate != 48000 )
152 intf_ErrMsg( "spdif error: Only 48000 Hz streams supported");
154 aout_DestroyFifo( p_spdif->p_aout_fifo );
158 GetChunk( &p_spdif->bit_stream, p_spdif->p_ac3 + sizeof(sync_frame_t),
159 p_spdif->ac3_info.i_frame_size - sizeof(sync_frame_t) );
164 /****************************************************************************
165 * RunThread: loop that reads ac3 ES and transform it to
166 * an spdif compliant stream.
167 ****************************************************************************/
168 static void RunThread( ac3_spdif_thread_t * p_spdif )
170 /* Initializing the spdif decoder thread */
171 if( InitThread( p_spdif ) )
173 p_spdif->p_fifo->b_error = 1;
176 while( !p_spdif->p_fifo->b_die && !p_spdif->p_fifo->b_error )
178 /* Handle the dates */
179 if(DECODER_FIFO_START(*p_spdif->p_fifo)->i_pts)
181 p_spdif->p_aout_fifo->date[p_spdif->p_aout_fifo->l_end_frame] =
182 DECODER_FIFO_START(*p_spdif->p_fifo)->i_pts;
183 DECODER_FIFO_START(*p_spdif->p_fifo)->i_pts = 0;
187 p_spdif->p_aout_fifo->date[p_spdif->p_aout_fifo->l_end_frame] =
191 /* Write in the first free packet of aout fifo */
192 p_spdif->p_iec = (p_spdif->p_aout_fifo->buffer) +
193 (p_spdif->p_aout_fifo->l_end_frame * SPDIF_FRAME_SIZE );
195 /* Build burst to be sent to hardware decoder */
196 ac3_iec958_build_burst( p_spdif );
198 vlc_mutex_lock (&p_spdif->p_aout_fifo->data_lock);
199 p_spdif->p_aout_fifo->l_end_frame =
200 (p_spdif->p_aout_fifo->l_end_frame + 1 ) & AOUT_FIFO_SIZE;
201 vlc_mutex_unlock (&p_spdif->p_aout_fifo->data_lock);
203 /* Find syncword again in case of stream discontinuity */
204 while( ShowBits( &p_spdif->bit_stream, 16 ) != 0xb77 )
206 RemoveBits( &p_spdif->bit_stream, 8 );
209 /* Read data from bitstream */
210 GetChunk( &p_spdif->bit_stream, p_spdif->p_ac3,
211 p_spdif->ac3_info.i_frame_size );
214 /* If b_error is set, the ac3 spdif thread enters the error loop */
215 if( p_spdif->p_fifo->b_error )
217 ErrorThread( p_spdif );
220 /* End of the ac3 decoder thread */
221 EndThread( p_spdif );
226 /*****************************************************************************
227 * ErrorThread : ac3 spdif's RunThread() error loop
228 *****************************************************************************/
229 static void ErrorThread( ac3_spdif_thread_t * p_spdif )
231 /* We take the lock, because we are going to read/write the start/end
232 * indexes of the decoder fifo */
233 vlc_mutex_lock (&p_spdif->p_fifo->data_lock);
235 /* Wait until a `die' order is sent */
236 while( !p_spdif->p_fifo->b_die )
238 /* Trash all received PES packets */
239 while( !DECODER_FIFO_ISEMPTY( *p_spdif->p_fifo ) )
241 p_spdif->p_fifo->pf_delete_pes(p_spdif->p_fifo->p_packets_mgt,
242 DECODER_FIFO_START( *p_spdif->p_fifo ) );
243 DECODER_FIFO_INCSTART( *p_spdif->p_fifo );
246 /* Waiting for the input thread to put new PES packets in the fifo */
247 vlc_cond_wait( &p_spdif->p_fifo->data_wait,
248 &p_spdif->p_fifo->data_lock );
251 /* We can release the lock before leaving */
252 vlc_mutex_unlock( &p_spdif->p_fifo->data_lock );
255 /*****************************************************************************
256 * EndThread : ac3 spdif thread destruction
257 *****************************************************************************/
258 static void EndThread( ac3_spdif_thread_t * p_spdif )
260 intf_DbgMsg( "spdif debug: destroying thread %p", p_spdif );
262 /* If the audio output fifo was created, we destroy it */
263 if( p_spdif->p_aout_fifo != NULL )
265 aout_DestroyFifo( p_spdif->p_aout_fifo );
267 /* Make sure the output thread leaves the NextFrame() function */
268 vlc_mutex_lock( &(p_spdif->p_aout_fifo->data_lock ) );
269 vlc_cond_signal( &(p_spdif->p_aout_fifo->data_wait ) );
270 vlc_mutex_unlock( &(p_spdif->p_aout_fifo->data_lock ) );
274 /* Destroy descriptor */
275 free( p_spdif->p_config );
276 free( p_spdif->p_ac3 );
279 intf_DbgMsg ("spdif debug: thread %p destroyed", p_spdif );
282 /*****************************************************************************
283 * BitstreamCallback: Import parameters from the new data/PES packet
284 *****************************************************************************
285 * This function is called by input's NextDataPacket.
286 *****************************************************************************/
287 static void BitstreamCallback ( bit_stream_t * p_bit_stream,
292 p_bit_stream->p_byte += 3;