1 /*******************************************************************************
2 * video_decoder.c : video decoder thread
4 *******************************************************************************/
6 /* ?? passer en terminate/destroy avec les signaux supplémentaires */
8 /*******************************************************************************
10 *******************************************************************************/
18 #include <X11/extensions/XShm.h>
23 #include "vlc_thread.h"
26 #include "debug.h" /* ?? temporaire, requis par netlist.h */
29 #include "input_netlist.h"
30 #include "decoder_fifo.h"
32 #include "video_output.h"
34 #include "vdec_idct.h"
35 #include "video_decoder.h"
36 #include "vdec_motion.h"
38 #include "vpar_blocks.h"
39 #include "vpar_headers.h"
40 #include "video_fifo.h"
41 #include "vpar_synchro.h"
42 #include "video_parser.h"
47 static int InitThread ( vdec_thread_t *p_vdec );
48 static void RunThread ( vdec_thread_t *p_vdec );
49 static void ErrorThread ( vdec_thread_t *p_vdec );
50 static void EndThread ( vdec_thread_t *p_vdec );
51 static void DecodeMacroblock ( vdec_thread_t *p_vdec,
52 macroblock_t * p_mb );
54 /*******************************************************************************
55 * vdec_CreateThread: create a video decoder thread
56 *******************************************************************************
57 * This function creates a new video decoder thread, and returns a pointer
58 * to its description. On error, it returns NULL.
59 * Following configuration properties are used:
61 *******************************************************************************/
62 vdec_thread_t * vdec_CreateThread( vpar_thread_t *p_vpar /*, int *pi_status */ )
64 vdec_thread_t * p_vdec;
66 intf_DbgMsg("vdec debug: creating video decoder thread\n");
68 /* Allocate the memory needed to store the thread's structure */
69 if ( (p_vdec = (vdec_thread_t *)malloc( sizeof(vdec_thread_t) )) == NULL )
71 intf_ErrMsg("vdec error: not enough memory for vdec_CreateThread() to create the new thread\n");
76 * Initialize the thread properties
82 * Initialize the parser properties
84 p_vdec->p_vpar = p_vpar;
86 /* Spawn the video decoder thread */
87 if ( vlc_thread_create(&p_vdec->thread_id, "video decoder",
88 (vlc_thread_func)RunThread, (void *)p_vdec) )
90 intf_ErrMsg("vdec error: can't spawn video decoder thread\n");
95 intf_DbgMsg("vdec debug: video decoder thread (%p) created\n", p_vdec);
99 /*******************************************************************************
100 * vdec_DestroyThread: destroy a video decoder thread
101 *******************************************************************************
102 * Destroy and terminate thread. This function will return 0 if the thread could
103 * be destroyed, and non 0 else. The last case probably means that the thread
104 * was still active, and another try may succeed.
105 *******************************************************************************/
106 void vdec_DestroyThread( vdec_thread_t *p_vdec /*, int *pi_status */ )
108 intf_DbgMsg("vdec debug: requesting termination of video decoder thread %p\n", p_vdec);
110 /* Ask thread to kill itself */
113 /* Waiting for the decoder thread to exit */
114 /* Remove this as soon as the "status" flag is implemented */
115 vlc_thread_join( p_vdec->thread_id );
118 /* following functions are local */
120 /*******************************************************************************
121 * InitThread: initialize video decoder thread
122 *******************************************************************************
123 * This function is called from RunThread and performs the second step of the
124 * initialization. It returns 0 on success. Note that the thread's flag are not
125 * modified inside this function.
126 *******************************************************************************/
127 static int InitThread( vdec_thread_t *p_vdec )
129 intf_DbgMsg("vdec debug: initializing video decoder thread %p\n", p_vdec);
131 /* Initialize other properties */
134 p_vdec->c_idle_loops = 0;
135 p_vdec->c_decoded_pictures = 0;
136 p_vdec->c_decoded_i_pictures = 0;
137 p_vdec->c_decoded_p_pictures = 0;
138 p_vdec->c_decoded_b_pictures = 0;
141 /* Mark thread as running and return */
142 intf_DbgMsg("vdec debug: InitThread(%p) succeeded\n", p_vdec);
146 /*******************************************************************************
147 * RunThread: video decoder thread
148 *******************************************************************************
149 * Video decoder thread. This function does only return when the thread is
151 *******************************************************************************/
152 static void RunThread( vdec_thread_t *p_vdec )
154 intf_DbgMsg("vdec debug: running video decoder thread (%p) (pid == %i)\n",
158 * Initialize thread and free configuration
160 p_vdec->b_error = InitThread( p_vdec );
161 if( p_vdec->b_error )
168 * Main loop - it is not executed if an error occured during
171 while( (!p_vdec->b_die) && (!p_vdec->b_error) )
175 if( (p_mb = vpar_GetMacroblock( &p_vdec->p_vpar->vfifo )) != NULL )
177 DecodeMacroblock( p_vdec, p_mb );
184 if( p_vdec->b_error )
186 ErrorThread( p_vdec );
194 /*******************************************************************************
195 * ErrorThread: RunThread() error loop
196 *******************************************************************************
197 * This function is called when an error occured during thread main's loop. The
198 * thread can still receive feed, but must be ready to terminate as soon as
200 *******************************************************************************/
201 static void ErrorThread( vdec_thread_t *p_vdec )
205 /* Wait until a `die' order */
206 while( !p_vdec->b_die )
208 p_mb = vpar_GetMacroblock( &p_vdec->p_vpar->vfifo );
209 vpar_DestroyMacroblock( &p_vdec->p_vpar->vfifo, p_mb );
212 msleep( VDEC_IDLE_SLEEP );
216 /*******************************************************************************
217 * EndThread: thread destruction
218 *******************************************************************************
219 * This function is called when the thread ends after a sucessfull
221 *******************************************************************************/
222 static void EndThread( vdec_thread_t *p_vdec )
224 intf_DbgMsg("vdec debug: EndThread(%p)\n", p_vdec);
227 /*******************************************************************************
228 * DecodeMacroblock : decode a macroblock of a picture
229 *******************************************************************************/
230 static void DecodeMacroblock( vdec_thread_t *p_vdec, macroblock_t * p_mb )
235 * Motion Compensation (ISO/IEC 13818-2 section 7.6)
237 (*p_mb->pf_motion)( p_mb );
240 for( i_b = 0; i_b < 4; i_b++ )
243 * Inverse DCT (ISO/IEC 13818-2 section Annex A)
245 (p_mb->pf_idct[i_b])( p_mb->ppi_blocks[i_b], p_mb->pi_sparse_pos[i_b] );
248 * Adding prediction and coefficient data (ISO/IEC 13818-2 section 7.6.8)
250 (p_mb->pf_addb[i_b])( p_mb->ppi_blocks[i_b],
251 p_mb->p_data[i_b], p_mb->i_lum_incr );
255 for( i_b = 4; i_b < 4 + 2*p_mb->i_chroma_nb_blocks; i_b++ )
258 * Inverse DCT (ISO/IEC 13818-2 section Annex A)
260 (p_mb->pf_idct[i_b])( p_mb->ppi_blocks[i_b], p_mb->pi_sparse_pos[i_b] );
263 * Adding prediction and coefficient data (ISO/IEC 13818-2 section 7.6.8)
265 (p_mb->pf_addb[i_b])( p_mb->ppi_blocks[i_b],
266 p_mb->p_data[i_b], p_mb->i_chroma_incr );
270 * Decoding is finished, release the macroblock and free
273 vpar_ReleaseMacroblock( &p_vdec->p_vpar->vfifo, p_mb );
276 /*******************************************************************************
277 * vdec_AddBlock : add a block
278 *******************************************************************************/
279 void vdec_AddBlock( elem_t * p_block, data_t * p_data, int i_incr )
283 for( i_y = 0; i_y < 8; i_y++ )
285 for( i_x = 0; i_x < 8; i_x++ )
287 /* ??? Need clip to be MPEG-2 compliant */
288 *p_data++ += *p_block++;
294 /*******************************************************************************
295 * vdec_CopyBlock : copy a block
296 *******************************************************************************/
297 void vdec_CopyBlock( elem_t * p_block, data_t * p_data, int i_incr )
301 for( i_y = 0; i_y < 8; i_y++ )
304 /* elem_t and data_t are the same */
305 memcopy( p_data, p_block, 8*sizeof(data_t) );
309 for( i_x = 0; i_x < 8; i_x++ )
311 /* ??? Need clip to be MPEG-2 compliant */
312 /* ??? Why does the reference decoder add 128 ??? */
313 *p_data++ = *p_block++;
320 /*******************************************************************************
321 * vdec_DummyBlock : dummy function that does nothing
322 *******************************************************************************/
323 void vdec_DummyBlock( elem_t * p_block, data_t * p_data, int i_incr )