1 /*******************************************************************************
2 * video_decoder.c : video decoder thread
4 *******************************************************************************/
6 /* ?? passer en terminate/destroy avec les signaux supplémentaires */
8 /*******************************************************************************
10 *******************************************************************************/
20 #include <X11/extensions/XShm.h>
25 #include "vlc_thread.h"
28 #include "debug.h" /* ?? temporaire, requis par netlist.h */
31 #include "input_netlist.h"
32 #include "decoder_fifo.h"
34 #include "video_output.h"
36 #include "vdec_idct.h"
37 #include "video_decoder.h"
38 #include "vdec_motion.h"
40 #include "vpar_blocks.h"
41 #include "vpar_headers.h"
42 #include "video_fifo.h"
43 #include "vpar_synchro.h"
44 #include "video_parser.h"
49 static int InitThread ( vdec_thread_t *p_vdec );
50 static void RunThread ( vdec_thread_t *p_vdec );
51 static void ErrorThread ( vdec_thread_t *p_vdec );
52 static void EndThread ( vdec_thread_t *p_vdec );
53 static void DecodeMacroblock ( vdec_thread_t *p_vdec,
54 macroblock_t * p_mb );
56 /*******************************************************************************
57 * vdec_CreateThread: create a video decoder thread
58 *******************************************************************************
59 * This function creates a new video decoder thread, and returns a pointer
60 * to its description. On error, it returns NULL.
61 * Following configuration properties are used:
63 *******************************************************************************/
64 vdec_thread_t * vdec_CreateThread( vpar_thread_t *p_vpar /*, int *pi_status */ )
66 vdec_thread_t * p_vdec;
68 intf_DbgMsg("vdec debug: creating video decoder thread\n");
70 /* Allocate the memory needed to store the thread's structure */
71 if ( (p_vdec = (vdec_thread_t *)malloc( sizeof(vdec_thread_t) )) == NULL )
73 intf_ErrMsg("vdec error: not enough memory for vdec_CreateThread() to create the new thread\n");
78 * Initialize the thread properties
84 * Initialize the parser properties
86 p_vdec->p_vpar = p_vpar;
88 /* Spawn the video decoder thread */
89 if ( vlc_thread_create(&p_vdec->thread_id, "video decoder",
90 (vlc_thread_func_t)RunThread, (void *)p_vdec) )
92 intf_ErrMsg("vdec error: can't spawn video decoder thread\n");
97 intf_DbgMsg("vdec debug: video decoder thread (%p) created\n", p_vdec);
101 /*******************************************************************************
102 * vdec_DestroyThread: destroy a video decoder thread
103 *******************************************************************************
104 * Destroy and terminate thread. This function will return 0 if the thread could
105 * be destroyed, and non 0 else. The last case probably means that the thread
106 * was still active, and another try may succeed.
107 *******************************************************************************/
108 void vdec_DestroyThread( vdec_thread_t *p_vdec /*, int *pi_status */ )
110 intf_DbgMsg("vdec debug: requesting termination of video decoder thread %p\n", p_vdec);
112 /* Ask thread to kill itself */
115 /* Waiting for the decoder thread to exit */
116 /* Remove this as soon as the "status" flag is implemented */
117 vlc_thread_join( p_vdec->thread_id );
120 /* following functions are local */
122 /*******************************************************************************
123 * InitThread: initialize video decoder thread
124 *******************************************************************************
125 * This function is called from RunThread and performs the second step of the
126 * initialization. It returns 0 on success. Note that the thread's flag are not
127 * modified inside this function.
128 *******************************************************************************/
129 static int InitThread( vdec_thread_t *p_vdec )
131 //#ifdef MPEG2_COMPLIANT
135 intf_DbgMsg("vdec debug: initializing video decoder thread %p\n", p_vdec);
137 /* Initialize other properties */
140 p_vdec->c_idle_loops = 0;
141 p_vdec->c_decoded_pictures = 0;
142 p_vdec->c_decoded_i_pictures = 0;
143 p_vdec->c_decoded_p_pictures = 0;
144 p_vdec->c_decoded_b_pictures = 0;
147 //#ifdef MPEG2_COMPLIANT
148 /* Init crop table */
149 p_vdec->pi_crop = p_vdec->pi_crop_buf + (VDEC_CROPRANGE >> 1);
150 for( i_dummy = -(VDEC_CROPRANGE >> 1); i_dummy < 0; i_dummy++ )
152 p_vdec->pi_crop[i_dummy] = 0;
154 for( ; i_dummy < 255; i_dummy ++ )
156 p_vdec->pi_crop[i_dummy] = i_dummy;
158 for( ; i_dummy < (VDEC_CROPRANGE >> 1) -1; i_dummy++ )
160 p_vdec->pi_crop[i_dummy] = 255;
164 /* Mark thread as running and return */
165 intf_DbgMsg("vdec debug: InitThread(%p) succeeded\n", p_vdec);
169 /*******************************************************************************
170 * RunThread: video decoder thread
171 *******************************************************************************
172 * Video decoder thread. This function does only return when the thread is
174 *******************************************************************************/
175 static void RunThread( vdec_thread_t *p_vdec )
177 intf_DbgMsg("vdec debug: running video decoder thread (%p) (pid == %i)\n",
181 * Initialize thread and free configuration
183 p_vdec->b_error = InitThread( p_vdec );
184 if( p_vdec->b_error )
191 * Main loop - it is not executed if an error occured during
194 while( (!p_vdec->b_die) && (!p_vdec->b_error) )
198 if( (p_mb = vpar_GetMacroblock( &p_vdec->p_vpar->vfifo )) != NULL )
200 DecodeMacroblock( p_vdec, p_mb );
207 if( p_vdec->b_error )
209 ErrorThread( p_vdec );
217 /*******************************************************************************
218 * ErrorThread: RunThread() error loop
219 *******************************************************************************
220 * This function is called when an error occured during thread main's loop. The
221 * thread can still receive feed, but must be ready to terminate as soon as
223 *******************************************************************************/
224 static void ErrorThread( vdec_thread_t *p_vdec )
228 /* Wait until a `die' order */
229 while( !p_vdec->b_die )
231 p_mb = vpar_GetMacroblock( &p_vdec->p_vpar->vfifo );
232 vpar_DestroyMacroblock( &p_vdec->p_vpar->vfifo, p_mb );
236 /*******************************************************************************
237 * EndThread: thread destruction
238 *******************************************************************************
239 * This function is called when the thread ends after a sucessfull
241 *******************************************************************************/
242 static void EndThread( vdec_thread_t *p_vdec )
244 intf_DbgMsg("vdec debug: EndThread(%p)\n", p_vdec);
247 /*******************************************************************************
248 * DecodeMacroblock : decode a macroblock of a picture
249 *******************************************************************************/
250 static void DecodeMacroblock( vdec_thread_t *p_vdec, macroblock_t * p_mb )
255 * Motion Compensation (ISO/IEC 13818-2 section 7.6)
257 (*p_mb->pf_motion)( p_mb );
260 for( i_b = 0; i_b <4; i_b++ )
263 * Inverse DCT (ISO/IEC 13818-2 section Annex A)
265 (p_mb->pf_idct[i_b])( p_vdec, p_mb->ppi_blocks[i_b],
266 p_mb->pi_sparse_pos[i_b] );
273 for( i = 0; i < 8; i++ )
275 for( j = 0; j < 8; j++ )
277 meuh[8*j + (7-i)] = p_mb->ppi_blocks[i_b][j + 8*i];
280 memcpy(p_mb->ppi_blocks[i_b], meuh, 128);
284 * Adding prediction and coefficient data (ISO/IEC 13818-2 section 7.6.8)
286 (p_mb->pf_addb[i_b])( p_vdec, p_mb->ppi_blocks[i_b],
287 p_mb->p_data[i_b], p_mb->i_addb_l_stride );
292 for( i_b = 4; i_b < 4 + p_mb->i_chroma_nb_blocks; i_b++ )
295 * Inverse DCT (ISO/IEC 13818-2 section Annex A)
297 (p_mb->pf_idct[i_b])( p_vdec, p_mb->ppi_blocks[i_b],
298 p_mb->pi_sparse_pos[i_b] );
304 for( i = 0; i < 8; i++ )
306 for( j = 0; j < 8; j++ )
308 meuh[8*j + (7-i)] = p_mb->ppi_blocks[i_b][j + 8*i];
311 memcpy(p_mb->ppi_blocks[i_b], meuh, 128);
316 * Adding prediction and coefficient data (ISO/IEC 13818-2 section 7.6.8)
318 (p_mb->pf_addb[i_b])( p_vdec, p_mb->ppi_blocks[i_b],
319 p_mb->p_data[i_b], p_mb->i_addb_c_stride );
323 * Decoding is finished, release the macroblock and free
326 vpar_ReleaseMacroblock( &p_vdec->p_vpar->vfifo, p_mb );
329 /*******************************************************************************
330 * vdec_AddBlock : add a block
331 *******************************************************************************/
332 void vdec_AddBlock( vdec_thread_t * p_vdec, elem_t * p_block, yuv_data_t * p_data, int i_incr )
336 for( i_y = 0; i_y < 8; i_y++ )
338 for( i_x = 0; i_x < 8; i_x++ )
340 #ifdef MPEG2_COMPLIANT
341 *p_data = p_vdec->pi_crop[*p_data + *p_block++];
344 *p_data++ += *p_block++;
351 /*******************************************************************************
352 * vdec_CopyBlock : copy a block
353 *******************************************************************************/
354 void vdec_CopyBlock( vdec_thread_t * p_vdec, elem_t * p_block, yuv_data_t * p_data, int i_incr )
357 //fprintf(stderr, "%d ", i_incr );
359 for( i_y = 0; i_y < 8; i_y++ )
362 /* elem_t and yuv_data_t are the same */
363 memcpy( p_data, p_block, 8*sizeof(yuv_data_t) );
369 for( i_x = 0; i_x < 8; i_x++ )
371 /* ??? Need clip to be MPEG-2 compliant */
372 /* ??? Why does the reference decoder add 128 ??? */
373 *p_data++ = p_vdec->pi_crop[*p_block++];
380 /*******************************************************************************
381 * vdec_DummyBlock : dummy function that does nothing
382 *******************************************************************************/
383 void vdec_DummyBlock( vdec_thread_t * p_vdec, elem_t * p_block, yuv_data_t * p_data, int i_incr )