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 */
34 #include "attributes.h"
35 #include "mpeg2_internal.h"
38 static int mpeg2_accels = 0;
40 #define BUFFER_SIZE (1194 * 1024)
42 const mpeg2_info_t *mpeg2_info( mpeg2dec_t * mpeg2dec )
44 return &(mpeg2dec->info);
47 static inline int skip_chunk( mpeg2dec_t * mpeg2dec, int bytes )
49 uint8_t *current = NULL;
51 uint8_t *limit = NULL;
57 current = mpeg2dec->buf_start;
58 shift = mpeg2dec->shift;
59 limit = current + bytes;
63 if (shift == 0x00000100)
67 mpeg2dec->shift = 0xffffff00;
68 skipped = current - mpeg2dec->buf_start;
69 mpeg2dec->buf_start = current;
72 shift = (shift | byte) << 8;
73 } while (current < limit);
75 mpeg2dec->shift = shift;
76 mpeg2dec->buf_start = current;
80 static inline int copy_chunk( mpeg2dec_t * mpeg2dec, int bytes )
82 uint8_t *current = NULL;
84 uint8_t *chunk_ptr = NULL;
85 uint8_t *limit = NULL;
91 current = mpeg2dec->buf_start;
92 shift = mpeg2dec->shift;
93 chunk_ptr = mpeg2dec->chunk_ptr;
94 limit = current + bytes;
98 if (shift == 0x00000100)
102 mpeg2dec->shift = 0xffffff00;
103 mpeg2dec->chunk_size = chunk_ptr - mpeg2dec->chunk_start - 3;
104 mpeg2dec->chunk_ptr = chunk_ptr + 1;
105 copied = current - mpeg2dec->buf_start;
106 mpeg2dec->buf_start = current;
109 shift = (shift | byte) << 8;
111 } while (current < limit);
113 mpeg2dec->shift = shift;
114 mpeg2dec->buf_start = current;
118 void mpeg2_buffer( mpeg2dec_t * mpeg2dec, uint8_t * start, uint8_t * end )
120 mpeg2dec->buf_start = start;
121 mpeg2dec->buf_end = end;
124 int mpeg2_getpos( mpeg2dec_t * mpeg2dec )
126 return mpeg2dec->buf_end - mpeg2dec->buf_start;
129 static inline mpeg2_state_t seek_chunk( mpeg2dec_t * mpeg2dec )
133 size = mpeg2dec->buf_end - mpeg2dec->buf_start;
134 skipped = skip_chunk (mpeg2dec, size);
137 mpeg2dec->bytes_since_tag += size;
140 mpeg2dec->bytes_since_tag += skipped;
141 mpeg2dec->code = mpeg2dec->buf_start[-1];
142 return (mpeg2_state_t)-1;
145 mpeg2_state_t mpeg2_seek_header( mpeg2dec_t * mpeg2dec )
147 while( (mpeg2dec->code != 0xb3) &&
148 (((mpeg2dec->code != 0xb7) &&
149 (mpeg2dec->code != 0xb8) &&
151 (mpeg2dec->sequence.width == (unsigned)-1)) )
153 if (seek_chunk (mpeg2dec) == STATE_BUFFER)
157 mpeg2dec->chunk_start = mpeg2dec->chunk_ptr = mpeg2dec->chunk_buffer;
158 mpeg2dec->user_data_len = 0;
159 return (mpeg2dec->code ? mpeg2_parse_header (mpeg2dec) :
160 mpeg2_header_picture_start (mpeg2dec));
163 #define RECEIVED(code,state) (((state) << 8) + (code))
165 mpeg2_state_t mpeg2_parse( mpeg2dec_t * mpeg2dec )
167 int size_buffer, size_chunk, copied;
169 if (mpeg2dec->action)
173 state = mpeg2dec->action (mpeg2dec);
180 while( (unsigned int) (mpeg2dec->code - mpeg2dec->first_decode_slice)
181 < mpeg2dec->nb_decode_slices )
183 size_buffer = mpeg2dec->buf_end - mpeg2dec->buf_start;
184 size_chunk = (mpeg2dec->chunk_buffer + BUFFER_SIZE -
185 mpeg2dec->chunk_ptr);
187 if (size_buffer <= size_chunk)
189 copied = copy_chunk (mpeg2dec, size_buffer);
192 mpeg2dec->bytes_since_tag += size_buffer;
193 mpeg2dec->chunk_ptr += size_buffer;
199 copied = copy_chunk (mpeg2dec, size_chunk);
203 /* filled the chunk buffer without finding a start code */
204 mpeg2dec->bytes_since_tag += size_chunk;
205 mpeg2dec->action = seek_chunk;
206 return STATE_INVALID;
209 mpeg2dec->bytes_since_tag += copied;
210 mpeg2_xxmc_slice( mpeg2dec, NULL,
211 mpeg2dec->code,mpeg2dec->chunk_start,
212 mpeg2dec->chunk_size);
213 mpeg2dec->prev_code = mpeg2dec->code;
214 mpeg2dec->code = mpeg2dec->buf_start[-1];
215 mpeg2dec->chunk_ptr = mpeg2dec->chunk_start;
218 if( (unsigned int) (mpeg2dec->code - 1) >= (0xb0 - 1) )
220 if( seek_chunk (mpeg2dec) == STATE_BUFFER )
224 switch( mpeg2dec->code )
227 mpeg2dec->action = mpeg2_header_picture_start;
228 return mpeg2dec->state;
230 mpeg2dec->action = mpeg2_header_end;
234 mpeg2dec->action = mpeg2_parse_header;
237 mpeg2dec->action = seek_chunk;
238 return STATE_INVALID;
240 return (mpeg2dec->state == STATE_SLICE) ? STATE_SLICE : STATE_INVALID;
243 mpeg2_state_t mpeg2_parse_header( mpeg2dec_t * mpeg2dec )
245 static int (* process_header[]) (mpeg2dec_t * mpeg2dec) =
247 mpeg2_header_picture,
248 mpeg2_header_extension,
249 mpeg2_header_user_data,
250 mpeg2_header_sequence,
257 int size_buffer, size_chunk, copied;
259 mpeg2dec->action = mpeg2_parse_header;
260 mpeg2dec->info.user_data = NULL;
261 mpeg2dec->info.user_data_len = 0;
265 size_buffer = mpeg2dec->buf_end - mpeg2dec->buf_start;
266 size_chunk = (mpeg2dec->chunk_buffer + BUFFER_SIZE -
267 mpeg2dec->chunk_ptr);
268 if( size_buffer <= size_chunk )
270 copied = copy_chunk (mpeg2dec, size_buffer);
273 mpeg2dec->bytes_since_tag += size_buffer;
274 mpeg2dec->chunk_ptr += size_buffer;
280 copied = copy_chunk (mpeg2dec, size_chunk);
283 /* filled the chunk buffer without finding a start code */
284 mpeg2dec->bytes_since_tag += size_chunk;
285 mpeg2dec->code = 0xb4;
286 mpeg2dec->action = mpeg2_seek_header;
287 return STATE_INVALID;
290 mpeg2dec->bytes_since_tag += copied;
292 if( process_header[mpeg2dec->code & 0x0b](mpeg2dec) )
294 mpeg2dec->code = mpeg2dec->buf_start[-1];
295 mpeg2dec->action = mpeg2_seek_header;
296 return STATE_INVALID;
298 mpeg2dec->code = mpeg2dec->buf_start[-1];
300 switch( RECEIVED(mpeg2dec->code, mpeg2dec->state) )
302 /* state transition after a sequence header */
303 case RECEIVED (0x00, STATE_SEQUENCE):
304 mpeg2dec->action = mpeg2_header_picture_start;
305 case RECEIVED (0xb8, STATE_SEQUENCE):
306 mpeg2_header_sequence_finalize( mpeg2dec );
308 /* other legal state transitions */
309 case RECEIVED (0x00, STATE_GOP):
310 mpeg2_header_gop_finalize( mpeg2dec );
311 mpeg2dec->action = mpeg2_header_picture_start;
313 case RECEIVED (0x01, STATE_PICTURE):
314 case RECEIVED (0x01, STATE_PICTURE_2ND):
315 mpeg2_header_picture_finalize( mpeg2dec, mpeg2_accels );
316 mpeg2dec->action = mpeg2_header_slice_start;
318 /* legal headers within a given state */
319 case RECEIVED (0xb2, STATE_SEQUENCE):
320 case RECEIVED (0xb2, STATE_GOP):
321 case RECEIVED (0xb2, STATE_PICTURE):
322 case RECEIVED (0xb2, STATE_PICTURE_2ND):
323 case RECEIVED (0xb5, STATE_SEQUENCE):
324 case RECEIVED (0xb5, STATE_PICTURE):
325 case RECEIVED (0xb5, STATE_PICTURE_2ND):
326 mpeg2dec->chunk_ptr = mpeg2dec->chunk_start;
329 mpeg2dec->action = mpeg2_seek_header;
330 return STATE_INVALID;
332 mpeg2dec->chunk_start = mpeg2dec->chunk_ptr = mpeg2dec->chunk_buffer;
333 mpeg2dec->user_data_len = 0;
334 return mpeg2dec->state;
338 int mpeg2_convert( mpeg2dec_t * mpeg2dec, mpeg2_convert_t convert, void * arg )
340 mpeg2_convert_init_t convert_init;
343 error = convert( MPEG2_CONVERT_SET, NULL, &(mpeg2dec->sequence), 0,
344 mpeg2_accels, arg, &convert_init );
347 mpeg2dec->convert = convert;
348 mpeg2dec->convert_arg = arg;
349 mpeg2dec->convert_id_size = convert_init.id_size;
350 mpeg2dec->convert_stride = 0;
355 int mpeg2_stride( mpeg2dec_t * mpeg2dec, int stride )
357 if (!mpeg2dec->convert)
359 if (stride < (int) mpeg2dec->sequence.width)
360 stride = mpeg2dec->sequence.width;
361 mpeg2dec->decoder.stride_frame = stride;
365 mpeg2_convert_init_t convert_init;
367 stride = mpeg2dec->convert( MPEG2_CONVERT_STRIDE, NULL,
368 &(mpeg2dec->sequence), stride,
369 mpeg2_accels, mpeg2dec->convert_arg,
371 mpeg2dec->convert_id_size = convert_init.id_size;
372 mpeg2dec->convert_stride = stride;
377 void mpeg2_set_buf( mpeg2dec_t * mpeg2dec, uint8_t * buf[3], void * id )
381 if (mpeg2dec->custom_fbuf)
383 if (mpeg2dec->state == STATE_SEQUENCE)
385 mpeg2dec->fbuf[2] = mpeg2dec->fbuf[1];
386 mpeg2dec->fbuf[1] = mpeg2dec->fbuf[0];
388 mpeg2_set_fbuf( mpeg2dec,
389 (mpeg2dec->decoder.coding_type == PIC_FLAG_CODING_TYPE_B) );
390 fbuf = mpeg2dec->fbuf[0];
394 fbuf = &(mpeg2dec->fbuf_alloc[mpeg2dec->alloc_index].fbuf);
395 mpeg2dec->alloc_index_user = ++mpeg2dec->alloc_index;
397 fbuf->buf[0] = buf[0];
398 fbuf->buf[1] = buf[1];
399 fbuf->buf[2] = buf[2];
403 void mpeg2_custom_fbuf( mpeg2dec_t * mpeg2dec, int custom_fbuf )
405 mpeg2dec->custom_fbuf = custom_fbuf;
408 void mpeg2_skip( mpeg2dec_t * mpeg2dec, int skip )
410 mpeg2dec->first_decode_slice = 1;
411 mpeg2dec->nb_decode_slices = skip ? 0 : (0xb0 - 1);
414 void mpeg2_slice_region( mpeg2dec_t * mpeg2dec, int start, int end )
416 start = (start < 1) ? 1 : (start > 0xb0) ? 0xb0 : start;
417 end = (end < start) ? start : (end > 0xb0) ? 0xb0 : end;
418 mpeg2dec->first_decode_slice = start;
419 mpeg2dec->nb_decode_slices = end - start;
422 void mpeg2_tag_picture( mpeg2dec_t * mpeg2dec, uint32_t tag, uint32_t tag2 )
424 mpeg2dec->tag_previous = mpeg2dec->tag_current;
425 mpeg2dec->tag2_previous = mpeg2dec->tag2_current;
426 mpeg2dec->tag_current = tag;
427 mpeg2dec->tag2_current = tag2;
428 mpeg2dec->num_tags++;
429 mpeg2dec->bytes_since_tag = 0;
432 uint32_t mpeg2_accel( uint32_t accel )
436 if( accel & MPEG2_ACCEL_DETECT )
437 accel |= mpeg2_detect_accel ();
438 mpeg2_accels = accel |= MPEG2_ACCEL_DETECT;
439 mpeg2_cpu_state_init (accel);
440 /* mpeg2_idct_init (accel); */
441 mpeg2_mc_init (accel);
443 return mpeg2_accels & ~MPEG2_ACCEL_DETECT;
446 void mpeg2_reset( mpeg2dec_t * mpeg2dec, int full_reset )
448 mpeg2dec->buf_start = mpeg2dec->buf_end = NULL;
449 mpeg2dec->num_tags = 0;
450 mpeg2dec->shift = 0xffffff00;
451 mpeg2dec->code = 0xb4;
452 mpeg2dec->action = mpeg2_seek_header;
453 mpeg2dec->state = STATE_INVALID;
455 mpeg2dec->ptr_forward_ref_picture = NULL;
456 mpeg2dec->ptr_backward_ref_picture = NULL;
458 mpeg2_reset_info(&(mpeg2dec->info));
459 mpeg2dec->info.gop = NULL;
460 mpeg2dec->info.user_data = NULL;
461 mpeg2dec->info.user_data_len = 0;
464 mpeg2dec->info.sequence = NULL;
465 mpeg2_header_state_init (mpeg2dec);
469 mpeg2dec_t *mpeg2_init( void )
471 mpeg2dec_t *mpeg2dec = NULL;
473 mpeg2_accel( MPEG2_ACCEL_DETECT );
474 mpeg2dec = (mpeg2dec_t *) mpeg2_malloc( sizeof (mpeg2dec_t),
475 MPEG2_ALLOC_MPEG2DEC );
476 if( mpeg2dec == NULL )
479 memset( mpeg2dec->decoder.DCTblock, 0, 64 * sizeof (int16_t) );
480 memset( mpeg2dec->quantizer_matrix, 0, 4 * 64 * sizeof (uint8_t) );
482 mpeg2dec->chunk_buffer = (uint8_t *) mpeg2_malloc( BUFFER_SIZE + 4,
484 mpeg2dec->sequence.width = (unsigned int)-1;
485 mpeg2_reset (mpeg2dec, 1);
489 void mpeg2_close( mpeg2dec_t * mpeg2dec )
491 mpeg2_header_state_init( mpeg2dec );
492 mpeg2_free( mpeg2dec->chunk_buffer );
493 mpeg2_free( mpeg2dec );