1 /*****************************************************************************
2 * ac3_decoder_thread.c: ac3 decoder thread
3 *****************************************************************************
4 * Copyright (C) 1999, 2000 VideoLAN
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
21 *****************************************************************************/
26 * - vérifier l'état de la fifo de sortie avant d'y stocker les samples
28 * - vlc_cond_signal() / vlc_cond_wait()
32 /*****************************************************************************
34 *****************************************************************************/
37 #include <unistd.h> /* getpid() */
39 #include <stdio.h> /* "intf_msg.h" */
40 #include <stdlib.h> /* malloc(), free() */
41 #include <sys/types.h> /* on BSD, uio.h needs types.h */
42 #include <sys/uio.h> /* "input.h" */
49 #include "debug.h" /* "input_netlist.h" */
51 #include "intf_msg.h" /* intf_DbgMsg(), intf_ErrMsg() */
53 #include "input.h" /* pes_packet_t */
54 #include "input_netlist.h" /* input_NetlistFreePES() */
55 #include "decoder_fifo.h" /* DECODER_FIFO_(ISEMPTY|START|INCSTART)() */
57 #include "audio_output.h"
59 #include "ac3_decoder.h"
60 #include "ac3_decoder_thread.h"
62 #define AC3DEC_FRAME_SIZE (2*1536)
64 /*****************************************************************************
66 *****************************************************************************/
67 static int InitThread (ac3dec_thread_t * p_adec);
68 static void RunThread (ac3dec_thread_t * p_adec);
69 static void ErrorThread (ac3dec_thread_t * p_adec);
70 static void EndThread (ac3dec_thread_t * p_adec);
72 /*****************************************************************************
73 * ac3dec_CreateThread: creates an ac3 decoder thread
74 *****************************************************************************/
75 ac3dec_thread_t * ac3dec_CreateThread (input_thread_t * p_input)
77 ac3dec_thread_t * p_ac3dec;
79 intf_DbgMsg ("ac3dec debug: creating ac3 decoder thread\n");
81 /* Allocate the memory needed to store the thread's structure */
82 if ((p_ac3dec = (ac3dec_thread_t *)malloc (sizeof(ac3dec_thread_t))) == NULL) {
83 intf_ErrMsg ("ac3dec error: not enough memory for ac3dec_CreateThread() to create the new thread\n");
88 * Initialize the thread properties
91 p_ac3dec->b_error = 0;
94 * Initialize the input properties
96 /* Initialize the decoder fifo's data lock and conditional variable and set
97 * its buffer as empty */
98 vlc_mutex_init (&p_ac3dec->fifo.data_lock);
99 vlc_cond_init (&p_ac3dec->fifo.data_wait);
100 p_ac3dec->fifo.i_start = 0;
101 p_ac3dec->fifo.i_end = 0;
103 /* Initialize the ac3 decoder structures */
104 ac3_init (&p_ac3dec->ac3_decoder);
106 /* Initialize the bit stream structure */
107 p_ac3dec->p_input = p_input;
110 * Initialize the output properties
112 p_ac3dec->p_aout = p_input->p_aout;
113 p_ac3dec->p_aout_fifo = NULL;
115 /* Spawn the ac3 decoder thread */
116 if (vlc_thread_create(&p_ac3dec->thread_id, "ac3 decoder", (vlc_thread_func_t)RunThread, (void *)p_ac3dec)) {
117 intf_ErrMsg ("ac3dec error: can't spawn ac3 decoder thread\n");
122 intf_DbgMsg ("ac3dec debug: ac3 decoder thread (%p) created\n", p_ac3dec);
126 /*****************************************************************************
127 * ac3dec_DestroyThread: destroys an ac3 decoder thread
128 *****************************************************************************/
129 void ac3dec_DestroyThread (ac3dec_thread_t * p_ac3dec)
131 intf_DbgMsg ("ac3dec debug: requesting termination of ac3 decoder thread %p\n", p_ac3dec);
133 /* Ask thread to kill itself */
136 /* Make sure the decoder thread leaves the GetByte() function */
137 vlc_mutex_lock (&(p_ac3dec->fifo.data_lock));
138 vlc_cond_signal (&(p_ac3dec->fifo.data_wait));
139 vlc_mutex_unlock (&(p_ac3dec->fifo.data_lock));
141 /* Waiting for the decoder thread to exit */
142 /* Remove this as soon as the "status" flag is implemented */
143 vlc_thread_join (p_ac3dec->thread_id);
146 /* Following functions are local */
148 /*****************************************************************************
149 * InitThread : initialize an ac3 decoder thread
150 *****************************************************************************/
151 static int InitThread (ac3dec_thread_t * p_ac3dec)
153 aout_fifo_t aout_fifo;
154 ac3_byte_stream_t * byte_stream;
156 intf_DbgMsg ("ac3dec debug: initializing ac3 decoder thread %p\n", p_ac3dec);
158 /* Our first job is to initialize the bit stream structure with the
159 * beginning of the input stream */
160 vlc_mutex_lock (&p_ac3dec->fifo.data_lock);
161 while (DECODER_FIFO_ISEMPTY(p_ac3dec->fifo)) {
162 if (p_ac3dec->b_die) {
163 vlc_mutex_unlock (&p_ac3dec->fifo.data_lock);
166 vlc_cond_wait (&p_ac3dec->fifo.data_wait, &p_ac3dec->fifo.data_lock);
168 p_ac3dec->p_ts = DECODER_FIFO_START (p_ac3dec->fifo)->p_first_ts;
169 byte_stream = ac3_byte_stream (&p_ac3dec->ac3_decoder);
170 byte_stream->p_byte =
171 p_ac3dec->p_ts->buffer + p_ac3dec->p_ts->i_payload_start;
173 p_ac3dec->p_ts->buffer + p_ac3dec->p_ts->i_payload_end;
174 byte_stream->info = p_ac3dec;
175 vlc_mutex_unlock (&p_ac3dec->fifo.data_lock);
177 aout_fifo.i_type = AOUT_ADEC_STEREO_FIFO;
178 aout_fifo.i_channels = 2;
179 aout_fifo.b_stereo = 1;
181 aout_fifo.l_frame_size = AC3DEC_FRAME_SIZE;
183 /* Creating the audio output fifo */
184 if ((p_ac3dec->p_aout_fifo = aout_CreateFifo(p_ac3dec->p_aout, &aout_fifo)) == NULL) {
188 intf_DbgMsg ("ac3dec debug: ac3 decoder thread %p initialized\n", p_ac3dec);
192 /*****************************************************************************
193 * RunThread : ac3 decoder thread
194 *****************************************************************************/
195 static void RunThread (ac3dec_thread_t * p_ac3dec)
199 intf_DbgMsg ("ac3dec debug: running ac3 decoder thread (%p) (pid == %i)\n", p_ac3dec, getpid());
201 msleep (INPUT_PTS_DELAY);
203 /* Initializing the ac3 decoder thread */
204 if (InitThread (p_ac3dec)) /* XXX?? */ {
205 p_ac3dec->b_error = 1;
209 p_ac3dec->sync_ptr = 0;
211 /* ac3 decoder thread's main loop */
212 /* FIXME : do we have enough room to store the decoded frames ?? */
213 while ((!p_ac3dec->b_die) && (!p_ac3dec->b_error)) {
215 ac3_sync_info_t sync_info;
217 if (!sync) { /* have to find a synchro point */
219 ac3_byte_stream_t * p_byte_stream;
221 intf_Msg ("ac3dec: sync\n");
223 p_byte_stream = ac3_byte_stream (&p_ac3dec->ac3_decoder);
225 /* first read till next ac3 magic header */
227 ac3_byte_stream_next (p_byte_stream);
228 } while ((!p_ac3dec->sync_ptr) &&
229 (!p_ac3dec->b_die) &&
230 (!p_ac3dec->b_error));
231 /* skip the specified number of bytes */
233 ptr = p_ac3dec->sync_ptr;
234 while (--ptr && (!p_ac3dec->b_die) && (!p_ac3dec->b_error)) {
235 if (p_byte_stream->p_byte >= p_byte_stream->p_end) {
236 ac3_byte_stream_next (p_byte_stream);
238 p_byte_stream->p_byte++;
241 /* we are in sync now */
244 p_ac3dec->sync_ptr = 0;
247 if (DECODER_FIFO_START(p_ac3dec->fifo)->b_has_pts) {
248 p_ac3dec->p_aout_fifo->date[p_ac3dec->p_aout_fifo->l_end_frame] = DECODER_FIFO_START(p_ac3dec->fifo)->i_pts;
249 DECODER_FIFO_START(p_ac3dec->fifo)->b_has_pts = 0;
251 p_ac3dec->p_aout_fifo->date[p_ac3dec->p_aout_fifo->l_end_frame] = LAST_MDATE;
254 if (ac3_sync_frame (&p_ac3dec->ac3_decoder, &sync_info)) {
259 p_ac3dec->p_aout_fifo->l_rate = sync_info.sample_rate;
261 buffer = ((s16 *)p_ac3dec->p_aout_fifo->buffer) + (p_ac3dec->p_aout_fifo->l_end_frame * AC3DEC_FRAME_SIZE);
263 if (ac3_decode_frame (&p_ac3dec->ac3_decoder, buffer)) {
268 vlc_mutex_lock (&p_ac3dec->p_aout_fifo->data_lock);
269 p_ac3dec->p_aout_fifo->l_end_frame = (p_ac3dec->p_aout_fifo->l_end_frame + 1) & AOUT_FIFO_SIZE;
270 vlc_cond_signal (&p_ac3dec->p_aout_fifo->data_wait);
271 vlc_mutex_unlock (&p_ac3dec->p_aout_fifo->data_lock);
276 /* If b_error is set, the ac3 decoder thread enters the error loop */
277 if (p_ac3dec->b_error) {
278 ErrorThread (p_ac3dec);
281 /* End of the ac3 decoder thread */
282 EndThread (p_ac3dec);
285 /*****************************************************************************
286 * ErrorThread : ac3 decoder's RunThread() error loop
287 *****************************************************************************/
288 static void ErrorThread (ac3dec_thread_t * p_ac3dec)
290 /* We take the lock, because we are going to read/write the start/end
291 * indexes of the decoder fifo */
292 vlc_mutex_lock (&p_ac3dec->fifo.data_lock);
294 /* Wait until a `die' order is sent */
295 while (!p_ac3dec->b_die) {
296 /* Trash all received PES packets */
297 while (!DECODER_FIFO_ISEMPTY(p_ac3dec->fifo)) {
298 input_NetlistFreePES (p_ac3dec->p_input, DECODER_FIFO_START(p_ac3dec->fifo));
299 DECODER_FIFO_INCSTART (p_ac3dec->fifo);
302 /* Waiting for the input thread to put new PES packets in the fifo */
303 vlc_cond_wait (&p_ac3dec->fifo.data_wait, &p_ac3dec->fifo.data_lock);
306 /* We can release the lock before leaving */
307 vlc_mutex_unlock (&p_ac3dec->fifo.data_lock);
310 /*****************************************************************************
311 * EndThread : ac3 decoder thread destruction
312 *****************************************************************************/
313 static void EndThread (ac3dec_thread_t * p_ac3dec)
315 intf_DbgMsg ("ac3dec debug: destroying ac3 decoder thread %p\n", p_ac3dec);
317 /* If the audio output fifo was created, we destroy it */
318 if (p_ac3dec->p_aout_fifo != NULL) {
319 aout_DestroyFifo (p_ac3dec->p_aout_fifo);
321 /* Make sure the output thread leaves the NextFrame() function */
322 vlc_mutex_lock (&(p_ac3dec->p_aout_fifo->data_lock));
323 vlc_cond_signal (&(p_ac3dec->p_aout_fifo->data_wait));
324 vlc_mutex_unlock (&(p_ac3dec->p_aout_fifo->data_lock));
327 /* Destroy descriptor */
330 intf_DbgMsg ("ac3dec debug: ac3 decoder thread %p destroyed\n", p_ac3dec);
333 void ac3_byte_stream_next (ac3_byte_stream_t * p_byte_stream)
335 ac3dec_thread_t * p_ac3dec = p_byte_stream->info;
337 /* We are looking for the next TS packet that contains real data,
338 * and not just a PES header */
340 /* We were reading the last TS packet of this PES packet... It's
341 * time to jump to the next PES packet */
342 if (p_ac3dec->p_ts->p_next_ts == NULL) {
345 /* We are going to read/write the start and end indexes of the
346 * decoder fifo and to use the fifo's conditional variable,
347 * that's why we need to take the lock before */
348 vlc_mutex_lock (&p_ac3dec->fifo.data_lock);
350 /* Is the input thread dying ? */
351 if (p_ac3dec->p_input->b_die) {
352 vlc_mutex_unlock (&(p_ac3dec->fifo.data_lock));
356 /* We should increase the start index of the decoder fifo, but
357 * if we do this now, the input thread could overwrite the
358 * pointer to the current PES packet, and we weren't able to
359 * give it back to the netlist. That's why we free the PES
361 input_NetlistFreePES (p_ac3dec->p_input, DECODER_FIFO_START(p_ac3dec->fifo));
363 DECODER_FIFO_INCSTART (p_ac3dec->fifo);
365 while (DECODER_FIFO_ISEMPTY(p_ac3dec->fifo)) {
366 vlc_cond_wait (&p_ac3dec->fifo.data_wait, &p_ac3dec->fifo.data_lock);
368 if (p_ac3dec->p_input->b_die) {
369 vlc_mutex_unlock (&(p_ac3dec->fifo.data_lock));
374 /* The next byte could be found in the next PES packet */
375 p_ac3dec->p_ts = DECODER_FIFO_START (p_ac3dec->fifo)->p_first_ts;
377 /* parse ac3 magic header */
378 ptr = p_ac3dec->p_ts->buffer [p_ac3dec->p_ts->i_payload_start+2];
380 ptr |= p_ac3dec->p_ts->buffer [p_ac3dec->p_ts->i_payload_start+3];
381 p_ac3dec->sync_ptr = ptr;
382 p_ac3dec->p_ts->i_payload_start += 4;
384 /* We can release the fifo's data lock */
385 vlc_mutex_unlock (&p_ac3dec->fifo.data_lock);
388 /* Perhaps the next TS packet of the current PES packet contains
389 * real data (ie its payload's size is greater than 0) */
391 p_ac3dec->p_ts = p_ac3dec->p_ts->p_next_ts;
393 } while (p_ac3dec->p_ts->i_payload_start == p_ac3dec->p_ts->i_payload_end);
394 p_byte_stream->p_byte =
395 p_ac3dec->p_ts->buffer + p_ac3dec->p_ts->i_payload_start;
396 p_byte_stream->p_end =
397 p_ac3dec->p_ts->buffer + p_ac3dec->p_ts->i_payload_end;