3 * Copyright (C) 2000-2003 Michel Lespinasse <walken@zoy.org>
4 * Copyright (C) 1999-2000 Aaron Holtzman <aholtzma@ess.engr.uvic.ca>
6 * This file is part of mpeg2dec, a free MPEG-2 video stream decoder.
7 * See http://libmpeg2.sourceforge.net/ for updates.
9 * mpeg2dec is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * mpeg2dec is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
27 #include "xxmc-config.h"
29 #include <string.h> /* memcmp/memset, try to remove */
33 #include "attributes.h"
34 #include "mpeg2_internal.h"
37 static int mpeg2_accels = 0;
39 #define BUFFER_SIZE (1194 * 1024)
41 const mpeg2_info_t *mpeg2_info( mpeg2dec_t * mpeg2dec )
43 return &(mpeg2dec->info);
46 static inline int skip_chunk( mpeg2dec_t * mpeg2dec, int bytes )
48 uint8_t *current = NULL;
50 uint8_t *limit = NULL;
56 current = mpeg2dec->buf_start;
57 shift = mpeg2dec->shift;
58 limit = current + bytes;
62 if (shift == 0x00000100)
66 mpeg2dec->shift = 0xffffff00;
67 skipped = current - mpeg2dec->buf_start;
68 mpeg2dec->buf_start = current;
71 shift = (shift | byte) << 8;
72 } while (current < limit);
74 mpeg2dec->shift = shift;
75 mpeg2dec->buf_start = current;
79 static inline int copy_chunk( mpeg2dec_t * mpeg2dec, int bytes )
81 uint8_t *current = NULL;
83 uint8_t *chunk_ptr = NULL;
84 uint8_t *limit = NULL;
90 current = mpeg2dec->buf_start;
91 shift = mpeg2dec->shift;
92 chunk_ptr = mpeg2dec->chunk_ptr;
93 limit = current + bytes;
97 if (shift == 0x00000100)
101 mpeg2dec->shift = 0xffffff00;
102 mpeg2dec->chunk_size = chunk_ptr - mpeg2dec->chunk_start - 3;
103 mpeg2dec->chunk_ptr = chunk_ptr + 1;
104 copied = current - mpeg2dec->buf_start;
105 mpeg2dec->buf_start = current;
108 shift = (shift | byte) << 8;
110 } while (current < limit);
112 mpeg2dec->shift = shift;
113 mpeg2dec->buf_start = current;
117 void mpeg2_buffer( mpeg2dec_t * mpeg2dec, uint8_t * start, uint8_t * end )
119 mpeg2dec->buf_start = start;
120 mpeg2dec->buf_end = end;
123 int mpeg2_getpos( mpeg2dec_t * mpeg2dec )
125 return mpeg2dec->buf_end - mpeg2dec->buf_start;
128 static inline mpeg2_state_t seek_chunk( mpeg2dec_t * mpeg2dec )
132 size = mpeg2dec->buf_end - mpeg2dec->buf_start;
133 skipped = skip_chunk (mpeg2dec, size);
136 mpeg2dec->bytes_since_tag += size;
139 mpeg2dec->bytes_since_tag += skipped;
140 mpeg2dec->code = mpeg2dec->buf_start[-1];
141 return (mpeg2_state_t)-1;
144 mpeg2_state_t mpeg2_seek_header( mpeg2dec_t * mpeg2dec )
146 while( (mpeg2dec->code != 0xb3) &&
147 (((mpeg2dec->code != 0xb7) &&
148 (mpeg2dec->code != 0xb8) &&
150 (mpeg2dec->sequence.width == (unsigned)-1)) )
152 if (seek_chunk (mpeg2dec) == STATE_BUFFER)
156 mpeg2dec->chunk_start = mpeg2dec->chunk_ptr = mpeg2dec->chunk_buffer;
157 mpeg2dec->user_data_len = 0;
158 return (mpeg2dec->code ? mpeg2_parse_header (mpeg2dec) :
159 mpeg2_header_picture_start (mpeg2dec));
162 #define RECEIVED(code,state) (((state) << 8) + (code))
164 mpeg2_state_t mpeg2_parse( mpeg2dec_t * mpeg2dec )
166 int size_buffer, size_chunk, copied;
168 if (mpeg2dec->action)
172 state = mpeg2dec->action (mpeg2dec);
179 while( (unsigned int) (mpeg2dec->code - mpeg2dec->first_decode_slice)
180 < mpeg2dec->nb_decode_slices )
182 size_buffer = mpeg2dec->buf_end - mpeg2dec->buf_start;
183 size_chunk = (mpeg2dec->chunk_buffer + BUFFER_SIZE -
184 mpeg2dec->chunk_ptr);
186 if (size_buffer <= size_chunk)
188 copied = copy_chunk (mpeg2dec, size_buffer);
191 mpeg2dec->bytes_since_tag += size_buffer;
192 mpeg2dec->chunk_ptr += size_buffer;
198 copied = copy_chunk (mpeg2dec, size_chunk);
202 /* filled the chunk buffer without finding a start code */
203 mpeg2dec->bytes_since_tag += size_chunk;
204 mpeg2dec->action = seek_chunk;
205 return STATE_INVALID;
208 mpeg2dec->bytes_since_tag += copied;
209 mpeg2_xxmc_slice( mpeg2dec, NULL,
210 mpeg2dec->code,mpeg2dec->chunk_start,
211 mpeg2dec->chunk_size);
212 mpeg2dec->prev_code = mpeg2dec->code;
213 mpeg2dec->code = mpeg2dec->buf_start[-1];
214 mpeg2dec->chunk_ptr = mpeg2dec->chunk_start;
217 if( (unsigned int) (mpeg2dec->code - 1) >= (0xb0 - 1) )
219 if( seek_chunk (mpeg2dec) == STATE_BUFFER )
223 switch( mpeg2dec->code )
226 mpeg2dec->action = mpeg2_header_picture_start;
227 return mpeg2dec->state;
229 mpeg2dec->action = mpeg2_header_end;
233 mpeg2dec->action = mpeg2_parse_header;
236 mpeg2dec->action = seek_chunk;
237 return STATE_INVALID;
239 return (mpeg2dec->state == STATE_SLICE) ? STATE_SLICE : STATE_INVALID;
242 mpeg2_state_t mpeg2_parse_header( mpeg2dec_t * mpeg2dec )
244 static int (* process_header[]) (mpeg2dec_t * mpeg2dec) =
246 mpeg2_header_picture,
247 mpeg2_header_extension,
248 mpeg2_header_user_data,
249 mpeg2_header_sequence,
256 int size_buffer, size_chunk, copied;
258 mpeg2dec->action = mpeg2_parse_header;
259 mpeg2dec->info.user_data = NULL;
260 mpeg2dec->info.user_data_len = 0;
264 size_buffer = mpeg2dec->buf_end - mpeg2dec->buf_start;
265 size_chunk = (mpeg2dec->chunk_buffer + BUFFER_SIZE -
266 mpeg2dec->chunk_ptr);
267 if( size_buffer <= size_chunk )
269 copied = copy_chunk (mpeg2dec, size_buffer);
272 mpeg2dec->bytes_since_tag += size_buffer;
273 mpeg2dec->chunk_ptr += size_buffer;
279 copied = copy_chunk (mpeg2dec, size_chunk);
282 /* filled the chunk buffer without finding a start code */
283 mpeg2dec->bytes_since_tag += size_chunk;
284 mpeg2dec->code = 0xb4;
285 mpeg2dec->action = mpeg2_seek_header;
286 return STATE_INVALID;
289 mpeg2dec->bytes_since_tag += copied;
291 if( process_header[mpeg2dec->code & 0x0b](mpeg2dec) )
293 mpeg2dec->code = mpeg2dec->buf_start[-1];
294 mpeg2dec->action = mpeg2_seek_header;
295 return STATE_INVALID;
297 mpeg2dec->code = mpeg2dec->buf_start[-1];
299 switch( RECEIVED(mpeg2dec->code, mpeg2dec->state) )
301 /* state transition after a sequence header */
302 case RECEIVED (0x00, STATE_SEQUENCE):
303 mpeg2dec->action = mpeg2_header_picture_start;
304 case RECEIVED (0xb8, STATE_SEQUENCE):
305 mpeg2_header_sequence_finalize( mpeg2dec );
307 /* other legal state transitions */
308 case RECEIVED (0x00, STATE_GOP):
309 mpeg2_header_gop_finalize( mpeg2dec );
310 mpeg2dec->action = mpeg2_header_picture_start;
312 case RECEIVED (0x01, STATE_PICTURE):
313 case RECEIVED (0x01, STATE_PICTURE_2ND):
314 mpeg2_header_picture_finalize( mpeg2dec, mpeg2_accels );
315 mpeg2dec->action = mpeg2_header_slice_start;
317 /* legal headers within a given state */
318 case RECEIVED (0xb2, STATE_SEQUENCE):
319 case RECEIVED (0xb2, STATE_GOP):
320 case RECEIVED (0xb2, STATE_PICTURE):
321 case RECEIVED (0xb2, STATE_PICTURE_2ND):
322 case RECEIVED (0xb5, STATE_SEQUENCE):
323 case RECEIVED (0xb5, STATE_PICTURE):
324 case RECEIVED (0xb5, STATE_PICTURE_2ND):
325 mpeg2dec->chunk_ptr = mpeg2dec->chunk_start;
328 mpeg2dec->action = mpeg2_seek_header;
329 return STATE_INVALID;
331 mpeg2dec->chunk_start = mpeg2dec->chunk_ptr = mpeg2dec->chunk_buffer;
332 mpeg2dec->user_data_len = 0;
333 return mpeg2dec->state;
337 int mpeg2_convert( mpeg2dec_t * mpeg2dec, mpeg2_convert_t convert, void * arg )
339 mpeg2_convert_init_t convert_init;
342 error = convert( MPEG2_CONVERT_SET, NULL, &(mpeg2dec->sequence), 0,
343 mpeg2_accels, arg, &convert_init );
346 mpeg2dec->convert = convert;
347 mpeg2dec->convert_arg = arg;
348 mpeg2dec->convert_id_size = convert_init.id_size;
349 mpeg2dec->convert_stride = 0;
354 int mpeg2_stride( mpeg2dec_t * mpeg2dec, int stride )
356 if (!mpeg2dec->convert)
358 if (stride < (int) mpeg2dec->sequence.width)
359 stride = mpeg2dec->sequence.width;
360 mpeg2dec->decoder.stride_frame = stride;
364 mpeg2_convert_init_t convert_init;
366 stride = mpeg2dec->convert( MPEG2_CONVERT_STRIDE, NULL,
367 &(mpeg2dec->sequence), stride,
368 mpeg2_accels, mpeg2dec->convert_arg,
370 mpeg2dec->convert_id_size = convert_init.id_size;
371 mpeg2dec->convert_stride = stride;
376 void mpeg2_set_buf( mpeg2dec_t * mpeg2dec, uint8_t * buf[3], void * id )
380 if (mpeg2dec->custom_fbuf)
382 if (mpeg2dec->state == STATE_SEQUENCE)
384 mpeg2dec->fbuf[2] = mpeg2dec->fbuf[1];
385 mpeg2dec->fbuf[1] = mpeg2dec->fbuf[0];
387 mpeg2_set_fbuf( mpeg2dec,
388 (mpeg2dec->decoder.coding_type == PIC_FLAG_CODING_TYPE_B) );
389 fbuf = mpeg2dec->fbuf[0];
393 fbuf = &(mpeg2dec->fbuf_alloc[mpeg2dec->alloc_index].fbuf);
394 mpeg2dec->alloc_index_user = ++mpeg2dec->alloc_index;
396 fbuf->buf[0] = buf[0];
397 fbuf->buf[1] = buf[1];
398 fbuf->buf[2] = buf[2];
402 void mpeg2_custom_fbuf( mpeg2dec_t * mpeg2dec, int custom_fbuf )
404 mpeg2dec->custom_fbuf = custom_fbuf;
407 void mpeg2_skip( mpeg2dec_t * mpeg2dec, int skip )
409 mpeg2dec->first_decode_slice = 1;
410 mpeg2dec->nb_decode_slices = skip ? 0 : (0xb0 - 1);
413 void mpeg2_slice_region( mpeg2dec_t * mpeg2dec, int start, int end )
415 start = (start < 1) ? 1 : (start > 0xb0) ? 0xb0 : start;
416 end = (end < start) ? start : (end > 0xb0) ? 0xb0 : end;
417 mpeg2dec->first_decode_slice = start;
418 mpeg2dec->nb_decode_slices = end - start;
421 void mpeg2_tag_picture( mpeg2dec_t * mpeg2dec, uint32_t tag, uint32_t tag2 )
423 mpeg2dec->tag_previous = mpeg2dec->tag_current;
424 mpeg2dec->tag2_previous = mpeg2dec->tag2_current;
425 mpeg2dec->tag_current = tag;
426 mpeg2dec->tag2_current = tag2;
427 mpeg2dec->num_tags++;
428 mpeg2dec->bytes_since_tag = 0;
431 uint32_t mpeg2_accel( uint32_t accel )
435 if( accel & MPEG2_ACCEL_DETECT )
436 accel |= mpeg2_detect_accel ();
437 mpeg2_accels = accel |= MPEG2_ACCEL_DETECT;
438 mpeg2_cpu_state_init (accel);
439 /* mpeg2_idct_init (accel); */
440 mpeg2_mc_init (accel);
442 return mpeg2_accels & ~MPEG2_ACCEL_DETECT;
445 void mpeg2_reset( mpeg2dec_t * mpeg2dec, int full_reset )
447 mpeg2dec->buf_start = mpeg2dec->buf_end = NULL;
448 mpeg2dec->num_tags = 0;
449 mpeg2dec->shift = 0xffffff00;
450 mpeg2dec->code = 0xb4;
451 mpeg2dec->action = mpeg2_seek_header;
452 mpeg2dec->state = STATE_INVALID;
454 mpeg2dec->ptr_forward_ref_picture = NULL;
455 mpeg2dec->ptr_backward_ref_picture = NULL;
457 mpeg2_reset_info(&(mpeg2dec->info));
458 mpeg2dec->info.gop = NULL;
459 mpeg2dec->info.user_data = NULL;
460 mpeg2dec->info.user_data_len = 0;
463 mpeg2dec->info.sequence = NULL;
464 mpeg2_header_state_init (mpeg2dec);
468 mpeg2dec_t *mpeg2_init( void )
470 mpeg2dec_t *mpeg2dec = NULL;
472 mpeg2_accel( MPEG2_ACCEL_DETECT );
473 mpeg2dec = (mpeg2dec_t *) mpeg2_malloc( sizeof (mpeg2dec_t),
474 MPEG2_ALLOC_MPEG2DEC );
475 if( mpeg2dec == NULL )
478 memset( mpeg2dec->decoder.DCTblock, 0, 64 * sizeof (int16_t) );
479 memset( mpeg2dec->quantizer_matrix, 0, 4 * 64 * sizeof (uint8_t) );
481 mpeg2dec->chunk_buffer = (uint8_t *) mpeg2_malloc( BUFFER_SIZE + 4,
483 mpeg2dec->sequence.width = (unsigned int)-1;
484 mpeg2_reset (mpeg2dec, 1);
488 void mpeg2_close( mpeg2dec_t * mpeg2dec )
490 mpeg2_header_state_init( mpeg2dec );
491 mpeg2_free( mpeg2dec->chunk_buffer );
492 mpeg2_free( mpeg2dec );