author | kergoth <kergoth> | 2002-01-25 22:14:26 (UTC) |
---|---|---|
committer | kergoth <kergoth> | 2002-01-25 22:14:26 (UTC) |
commit | 15318cad33835e4e2dc620d033e43cd930676cdd (patch) (unidiff) | |
tree | c2fa0399a2c47fda8e2cd0092c73a809d17f68eb /core/multimedia/opieplayer/libmpeg3/video/headers.c | |
download | opie-15318cad33835e4e2dc620d033e43cd930676cdd.zip opie-15318cad33835e4e2dc620d033e43cd930676cdd.tar.gz opie-15318cad33835e4e2dc620d033e43cd930676cdd.tar.bz2 |
Initial revision
Diffstat (limited to 'core/multimedia/opieplayer/libmpeg3/video/headers.c') (more/less context) (ignore whitespace changes)
-rw-r--r-- | core/multimedia/opieplayer/libmpeg3/video/headers.c | 492 |
1 files changed, 492 insertions, 0 deletions
diff --git a/core/multimedia/opieplayer/libmpeg3/video/headers.c b/core/multimedia/opieplayer/libmpeg3/video/headers.c new file mode 100644 index 0000000..5274530 --- a/dev/null +++ b/core/multimedia/opieplayer/libmpeg3/video/headers.c | |||
@@ -0,0 +1,492 @@ | |||
1 | #include "../mpeg3demux.h" | ||
2 | #include "../libmpeg3.h" | ||
3 | #include "../mpeg3protos.h" | ||
4 | #include "mpeg3video.h" | ||
5 | |||
6 | #include <stdio.h> | ||
7 | #include <stdlib.h> | ||
8 | |||
9 | int mpeg3video_getseqhdr(mpeg3video_t *video) | ||
10 | { | ||
11 | int i; | ||
12 | mpeg3_t *file = video->file; | ||
13 | |||
14 | int aspect_ratio, picture_rate, vbv_buffer_size; | ||
15 | int constrained_parameters_flag; | ||
16 | int load_intra_quantizer_matrix, load_non_intra_quantizer_matrix; | ||
17 | |||
18 | video->horizontal_size = mpeg3bits_getbits(video->vstream, 12); | ||
19 | video->vertical_size = mpeg3bits_getbits(video->vstream, 12); | ||
20 | aspect_ratio = mpeg3bits_getbits(video->vstream, 4); | ||
21 | video->framerate_code = mpeg3bits_getbits(video->vstream, 4); | ||
22 | video->bitrate = mpeg3bits_getbits(video->vstream, 18); | ||
23 | mpeg3bits_getbit_noptr(video->vstream); /* marker bit (=1) */ | ||
24 | vbv_buffer_size = mpeg3bits_getbits(video->vstream, 10); | ||
25 | constrained_parameters_flag = mpeg3bits_getbit_noptr(video->vstream); | ||
26 | video->frame_rate = mpeg3_frame_rate_table[video->framerate_code]; | ||
27 | |||
28 | load_intra_quantizer_matrix = mpeg3bits_getbit_noptr(video->vstream); | ||
29 | if(load_intra_quantizer_matrix) | ||
30 | { | ||
31 | for(i = 0; i < 64; i++) | ||
32 | video->intra_quantizer_matrix[video->mpeg3_zigzag_scan_table[i]] = mpeg3bits_getbyte_noptr(video->vstream); | ||
33 | } | ||
34 | else | ||
35 | { | ||
36 | for(i = 0; i < 64; i++) | ||
37 | video->intra_quantizer_matrix[i] = mpeg3_default_intra_quantizer_matrix[i]; | ||
38 | } | ||
39 | |||
40 | load_non_intra_quantizer_matrix = mpeg3bits_getbit_noptr(video->vstream); | ||
41 | if(load_non_intra_quantizer_matrix) | ||
42 | { | ||
43 | for(i = 0; i < 64; i++) | ||
44 | video->non_intra_quantizer_matrix[video->mpeg3_zigzag_scan_table[i]] = mpeg3bits_getbyte_noptr(video->vstream); | ||
45 | } | ||
46 | else | ||
47 | { | ||
48 | for(i = 0; i < 64; i++) | ||
49 | video->non_intra_quantizer_matrix[i] = 16; | ||
50 | } | ||
51 | |||
52 | /* copy luminance to chrominance matrices */ | ||
53 | for(i = 0; i < 64; i++) | ||
54 | { | ||
55 | video->chroma_intra_quantizer_matrix[i] = video->intra_quantizer_matrix[i]; | ||
56 | video->chroma_non_intra_quantizer_matrix[i] = video->non_intra_quantizer_matrix[i]; | ||
57 | } | ||
58 | |||
59 | return 0; | ||
60 | } | ||
61 | |||
62 | |||
63 | /* decode sequence extension */ | ||
64 | |||
65 | int mpeg3video_sequence_extension(mpeg3video_t *video) | ||
66 | { | ||
67 | int prof_lev; | ||
68 | int horizontal_size_extension, vertical_size_extension; | ||
69 | int bit_rate_extension, vbv_buffer_size_extension, low_delay; | ||
70 | int frame_rate_extension_n, frame_rate_extension_d; | ||
71 | int pos = 0; | ||
72 | |||
73 | video->mpeg2 = 1; | ||
74 | video->scalable_mode = SC_NONE; /* unless overwritten by seq. scal. ext. */ | ||
75 | prof_lev = mpeg3bits_getbyte_noptr(video->vstream); | ||
76 | video->prog_seq = mpeg3bits_getbit_noptr(video->vstream); | ||
77 | video->chroma_format = mpeg3bits_getbits(video->vstream, 2); | ||
78 | horizontal_size_extension = mpeg3bits_getbits(video->vstream, 2); | ||
79 | vertical_size_extension = mpeg3bits_getbits(video->vstream, 2); | ||
80 | bit_rate_extension = mpeg3bits_getbits(video->vstream, 12); | ||
81 | mpeg3bits_getbit_noptr(video->vstream); | ||
82 | vbv_buffer_size_extension = mpeg3bits_getbyte_noptr(video->vstream); | ||
83 | low_delay = mpeg3bits_getbit_noptr(video->vstream); | ||
84 | frame_rate_extension_n = mpeg3bits_getbits(video->vstream, 2); | ||
85 | frame_rate_extension_d = mpeg3bits_getbits(video->vstream, 5); | ||
86 | video->horizontal_size = (horizontal_size_extension << 12) | (video->horizontal_size & 0x0fff); | ||
87 | video->vertical_size = (vertical_size_extension << 12) | (video->vertical_size & 0x0fff); | ||
88 | } | ||
89 | |||
90 | |||
91 | /* decode sequence display extension */ | ||
92 | |||
93 | int mpeg3video_sequence_display_extension(mpeg3video_t *video) | ||
94 | { | ||
95 | int colour_primaries = 0, transfer_characteristics = 0; | ||
96 | int display_horizontal_size, display_vertical_size; | ||
97 | int pos = 0; | ||
98 | int video_format = mpeg3bits_getbits(video->vstream, 3); | ||
99 | int colour_description = mpeg3bits_getbit_noptr(video->vstream); | ||
100 | |||
101 | if(colour_description) | ||
102 | { | ||
103 | colour_primaries = mpeg3bits_getbyte_noptr(video->vstream); | ||
104 | transfer_characteristics = mpeg3bits_getbyte_noptr(video->vstream); | ||
105 | video->matrix_coefficients = mpeg3bits_getbyte_noptr(video->vstream); | ||
106 | } | ||
107 | |||
108 | display_horizontal_size = mpeg3bits_getbits(video->vstream, 14); | ||
109 | mpeg3bits_getbit_noptr(video->vstream); | ||
110 | display_vertical_size = mpeg3bits_getbits(video->vstream, 14); | ||
111 | } | ||
112 | |||
113 | |||
114 | /* decode quant matrix entension */ | ||
115 | |||
116 | int mpeg3video_quant_matrix_extension(mpeg3video_t *video) | ||
117 | { | ||
118 | int i; | ||
119 | int load_intra_quantiser_matrix, load_non_intra_quantiser_matrix; | ||
120 | int load_chroma_intra_quantiser_matrix; | ||
121 | int load_chroma_non_intra_quantiser_matrix; | ||
122 | int pos = 0; | ||
123 | |||
124 | if((load_intra_quantiser_matrix = mpeg3bits_getbit_noptr(video->vstream)) != 0) | ||
125 | { | ||
126 | for(i = 0; i < 64; i++) | ||
127 | { | ||
128 | video->chroma_intra_quantizer_matrix[video->mpeg3_zigzag_scan_table[i]] | ||
129 | = video->intra_quantizer_matrix[video->mpeg3_zigzag_scan_table[i]] | ||
130 | = mpeg3bits_getbyte_noptr(video->vstream); | ||
131 | } | ||
132 | } | ||
133 | |||
134 | if((load_non_intra_quantiser_matrix = mpeg3bits_getbit_noptr(video->vstream)) != 0) | ||
135 | { | ||
136 | for (i = 0; i < 64; i++) | ||
137 | { | ||
138 | video->chroma_non_intra_quantizer_matrix[video->mpeg3_zigzag_scan_table[i]] | ||
139 | = video->non_intra_quantizer_matrix[video->mpeg3_zigzag_scan_table[i]] | ||
140 | = mpeg3bits_getbyte_noptr(video->vstream); | ||
141 | } | ||
142 | } | ||
143 | |||
144 | if((load_chroma_intra_quantiser_matrix = mpeg3bits_getbit_noptr(video->vstream)) != 0) | ||
145 | { | ||
146 | for(i = 0; i < 64; i++) | ||
147 | video->chroma_intra_quantizer_matrix[video->mpeg3_zigzag_scan_table[i]] = mpeg3bits_getbyte_noptr(video->vstream); | ||
148 | } | ||
149 | |||
150 | if((load_chroma_non_intra_quantiser_matrix = mpeg3bits_getbit_noptr(video->vstream)) != 0) | ||
151 | { | ||
152 | for(i = 0; i < 64; i++) | ||
153 | video->chroma_non_intra_quantizer_matrix[video->mpeg3_zigzag_scan_table[i]] = mpeg3bits_getbyte_noptr(video->vstream); | ||
154 | } | ||
155 | } | ||
156 | |||
157 | |||
158 | /* decode sequence scalable extension */ | ||
159 | |||
160 | int mpeg3video_sequence_scalable_extension(mpeg3video_t *video) | ||
161 | { | ||
162 | int layer_id; | ||
163 | |||
164 | video->scalable_mode = mpeg3bits_getbits(video->vstream, 2) + 1; /* add 1 to make SC_DP != SC_NONE */ | ||
165 | layer_id = mpeg3bits_getbits(video->vstream, 4); | ||
166 | |||
167 | if(video->scalable_mode == SC_SPAT) | ||
168 | { | ||
169 | video->llw = mpeg3bits_getbits(video->vstream, 14); /* lower_layer_prediction_horizontal_size */ | ||
170 | mpeg3bits_getbit_noptr(video->vstream); | ||
171 | video->llh = mpeg3bits_getbits(video->vstream, 14); /* lower_layer_prediction_vertical_size */ | ||
172 | video->hm = mpeg3bits_getbits(video->vstream, 5); | ||
173 | video->hn = mpeg3bits_getbits(video->vstream, 5); | ||
174 | video->vm = mpeg3bits_getbits(video->vstream, 5); | ||
175 | video->vn = mpeg3bits_getbits(video->vstream, 5); | ||
176 | } | ||
177 | |||
178 | if(video->scalable_mode == SC_TEMP) | ||
179 | fprintf(stderr, "mpeg3video_sequence_scalable_extension: temporal scalability not implemented\n"); | ||
180 | } | ||
181 | |||
182 | |||
183 | /* decode picture display extension */ | ||
184 | |||
185 | int mpeg3video_picture_display_extension(mpeg3video_t *video) | ||
186 | { | ||
187 | int n, i; | ||
188 | short frame_centre_horizontal_offset[3]; | ||
189 | short frame_centre_vertical_offset[3]; | ||
190 | |||
191 | if(video->prog_seq || video->pict_struct != FRAME_PICTURE) | ||
192 | n = 1; | ||
193 | else | ||
194 | n = video->repeatfirst ? 3 : 2; | ||
195 | |||
196 | for(i = 0; i < n; i++) | ||
197 | { | ||
198 | frame_centre_horizontal_offset[i] = (short)mpeg3bits_getbits(video->vstream, 16); | ||
199 | mpeg3bits_getbit_noptr(video->vstream); | ||
200 | frame_centre_vertical_offset[i] = (short)mpeg3bits_getbits(video->vstream, 16); | ||
201 | mpeg3bits_getbit_noptr(video->vstream); | ||
202 | } | ||
203 | } | ||
204 | |||
205 | |||
206 | /* decode picture coding extension */ | ||
207 | |||
208 | int mpeg3video_picture_coding_extension(mpeg3video_t *video) | ||
209 | { | ||
210 | int chroma_420_type, composite_display_flag; | ||
211 | int v_axis = 0, field_sequence = 0, sub_carrier = 0, burst_amplitude = 0, sub_carrier_phase = 0; | ||
212 | |||
213 | video->h_forw_r_size = mpeg3bits_getbits(video->vstream, 4) - 1; | ||
214 | video->v_forw_r_size = mpeg3bits_getbits(video->vstream, 4) - 1; | ||
215 | video->h_back_r_size = mpeg3bits_getbits(video->vstream, 4) - 1; | ||
216 | video->v_back_r_size = mpeg3bits_getbits(video->vstream, 4) - 1; | ||
217 | video->dc_prec = mpeg3bits_getbits(video->vstream, 2); | ||
218 | video->pict_struct = mpeg3bits_getbits(video->vstream, 2); | ||
219 | video->topfirst = mpeg3bits_getbit_noptr(video->vstream); | ||
220 | video->frame_pred_dct = mpeg3bits_getbit_noptr(video->vstream); | ||
221 | video->conceal_mv = mpeg3bits_getbit_noptr(video->vstream); | ||
222 | video->qscale_type = mpeg3bits_getbit_noptr(video->vstream); | ||
223 | video->intravlc = mpeg3bits_getbit_noptr(video->vstream); | ||
224 | video->altscan = mpeg3bits_getbit_noptr(video->vstream); | ||
225 | video->repeatfirst = mpeg3bits_getbit_noptr(video->vstream); | ||
226 | chroma_420_type = mpeg3bits_getbit_noptr(video->vstream); | ||
227 | video->prog_frame = mpeg3bits_getbit_noptr(video->vstream); | ||
228 | |||
229 | if(video->repeat_count > 100) | ||
230 | video->repeat_count = 0; | ||
231 | video->repeat_count += 100; | ||
232 | |||
233 | video->current_repeat = 0; | ||
234 | |||
235 | if(video->prog_seq) | ||
236 | { | ||
237 | if(video->repeatfirst) | ||
238 | { | ||
239 | if(video->topfirst) | ||
240 | video->repeat_count += 200; | ||
241 | else | ||
242 | video->repeat_count += 100; | ||
243 | } | ||
244 | } | ||
245 | else | ||
246 | if(video->prog_frame) | ||
247 | { | ||
248 | if(video->repeatfirst) | ||
249 | { | ||
250 | video->repeat_count += 50; | ||
251 | } | ||
252 | } | ||
253 | |||
254 | /*printf("mpeg3video_picture_coding_extension %d\n", video->repeat_count); */ | ||
255 | composite_display_flag = mpeg3bits_getbit_noptr(video->vstream); | ||
256 | |||
257 | if(composite_display_flag) | ||
258 | { | ||
259 | v_axis = mpeg3bits_getbit_noptr(video->vstream); | ||
260 | field_sequence = mpeg3bits_getbits(video->vstream, 3); | ||
261 | sub_carrier = mpeg3bits_getbit_noptr(video->vstream); | ||
262 | burst_amplitude = mpeg3bits_getbits(video->vstream, 7); | ||
263 | sub_carrier_phase = mpeg3bits_getbyte_noptr(video->vstream); | ||
264 | } | ||
265 | } | ||
266 | |||
267 | |||
268 | /* decode picture spatial scalable extension */ | ||
269 | |||
270 | int mpeg3video_picture_spatial_scalable_extension(mpeg3video_t *video) | ||
271 | { | ||
272 | video->pict_scal = 1; /* use spatial scalability in this picture */ | ||
273 | |||
274 | video->lltempref = mpeg3bits_getbits(video->vstream, 10); | ||
275 | mpeg3bits_getbit_noptr(video->vstream); | ||
276 | video->llx0 = mpeg3bits_getbits(video->vstream, 15); | ||
277 | if(video->llx0 >= 16384) video->llx0 -= 32768; | ||
278 | mpeg3bits_getbit_noptr(video->vstream); | ||
279 | video->lly0 = mpeg3bits_getbits(video->vstream, 15); | ||
280 | if(video->lly0 >= 16384) video->lly0 -= 32768; | ||
281 | video->stwc_table_index = mpeg3bits_getbits(video->vstream, 2); | ||
282 | video->llprog_frame = mpeg3bits_getbit_noptr(video->vstream); | ||
283 | video->llfieldsel = mpeg3bits_getbit_noptr(video->vstream); | ||
284 | } | ||
285 | |||
286 | |||
287 | /* decode picture temporal scalable extension | ||
288 | * | ||
289 | * not implemented | ||
290 | * | ||
291 | */ | ||
292 | |||
293 | int mpeg3video_picture_temporal_scalable_extension(mpeg3video_t *video) | ||
294 | { | ||
295 | fprintf(stderr, "mpeg3video_picture_temporal_scalable_extension: temporal scalability not supported\n"); | ||
296 | } | ||
297 | |||
298 | |||
299 | /* decode extension and user data */ | ||
300 | |||
301 | int mpeg3video_ext_user_data(mpeg3video_t *video) | ||
302 | { | ||
303 | int code = mpeg3bits_next_startcode(video->vstream); | ||
304 | |||
305 | |||
306 | while(code == MPEG3_EXT_START_CODE || code == MPEG3_USER_START_CODE && | ||
307 | !mpeg3bits_eof(video->vstream)) | ||
308 | { | ||
309 | mpeg3bits_refill(video->vstream); | ||
310 | |||
311 | if(code == MPEG3_EXT_START_CODE) | ||
312 | { | ||
313 | int ext_id = mpeg3bits_getbits(video->vstream, 4); | ||
314 | switch(ext_id) | ||
315 | { | ||
316 | case SEQ_ID: | ||
317 | mpeg3video_sequence_extension(video); | ||
318 | break; | ||
319 | case DISP_ID: | ||
320 | mpeg3video_sequence_display_extension(video); | ||
321 | break; | ||
322 | case QUANT_ID: | ||
323 | mpeg3video_quant_matrix_extension(video); | ||
324 | break; | ||
325 | case SEQSCAL_ID: | ||
326 | mpeg3video_sequence_scalable_extension(video); | ||
327 | break; | ||
328 | case PANSCAN_ID: | ||
329 | mpeg3video_picture_display_extension(video); | ||
330 | break; | ||
331 | case CODING_ID: | ||
332 | mpeg3video_picture_coding_extension(video); | ||
333 | break; | ||
334 | case SPATSCAL_ID: | ||
335 | mpeg3video_picture_spatial_scalable_extension(video); | ||
336 | break; | ||
337 | case TEMPSCAL_ID: | ||
338 | mpeg3video_picture_temporal_scalable_extension(video); | ||
339 | break; | ||
340 | default: | ||
341 | fprintf(stderr,"mpeg3video_ext_user_data: reserved extension start code ID %d\n", ext_id); | ||
342 | break; | ||
343 | } | ||
344 | } | ||
345 | code = mpeg3bits_next_startcode(video->vstream); | ||
346 | } | ||
347 | } | ||
348 | |||
349 | |||
350 | /* decode group of pictures header */ | ||
351 | |||
352 | int mpeg3video_getgophdr(mpeg3video_t *video) | ||
353 | { | ||
354 | int drop_flag, closed_gop, broken_link; | ||
355 | |||
356 | drop_flag = mpeg3bits_getbit_noptr(video->vstream); | ||
357 | video->gop_timecode.hour = mpeg3bits_getbits(video->vstream, 5); | ||
358 | video->gop_timecode.minute = mpeg3bits_getbits(video->vstream, 6); | ||
359 | mpeg3bits_getbit_noptr(video->vstream); | ||
360 | video->gop_timecode.second = mpeg3bits_getbits(video->vstream, 6); | ||
361 | video->gop_timecode.frame = mpeg3bits_getbits(video->vstream, 6); | ||
362 | closed_gop = mpeg3bits_getbit_noptr(video->vstream); | ||
363 | broken_link = mpeg3bits_getbit_noptr(video->vstream); | ||
364 | |||
365 | /* | ||
366 | * printf("%d:%d:%d:%d %d %d %d\n", video->gop_timecode.hour, video->gop_timecode.minute, video->gop_timecode.second, video->gop_timecode.frame, | ||
367 | * drop_flag, closed_gop, broken_link); | ||
368 | */ | ||
369 | return mpeg3bits_error(video->vstream); | ||
370 | } | ||
371 | |||
372 | /* decode picture header */ | ||
373 | |||
374 | int mpeg3video_getpicturehdr(mpeg3video_t *video) | ||
375 | { | ||
376 | int temp_ref, vbv_delay; | ||
377 | |||
378 | video->pict_scal = 0; /* unless overwritten by pict. spat. scal. ext. */ | ||
379 | |||
380 | temp_ref = mpeg3bits_getbits(video->vstream, 10); | ||
381 | video->pict_type = mpeg3bits_getbits(video->vstream, 3); | ||
382 | vbv_delay = mpeg3bits_getbits(video->vstream, 16); | ||
383 | |||
384 | if(video->pict_type == P_TYPE || video->pict_type == B_TYPE) | ||
385 | { | ||
386 | video->full_forw = mpeg3bits_getbit_noptr(video->vstream); | ||
387 | video->forw_r_size = mpeg3bits_getbits(video->vstream, 3) - 1; | ||
388 | } | ||
389 | |||
390 | if(video->pict_type == B_TYPE) | ||
391 | { | ||
392 | video->full_back = mpeg3bits_getbit_noptr(video->vstream); | ||
393 | video->back_r_size = mpeg3bits_getbits(video->vstream, 3) - 1; | ||
394 | } | ||
395 | |||
396 | /* get extra bit picture */ | ||
397 | while(mpeg3bits_getbit_noptr(video->vstream) && | ||
398 | !mpeg3bits_eof(video->vstream)) mpeg3bits_getbyte_noptr(video->vstream); | ||
399 | return 0; | ||
400 | } | ||
401 | |||
402 | |||
403 | int mpeg3video_get_header(mpeg3video_t *video, int dont_repeat) | ||
404 | { | ||
405 | unsigned int code; | ||
406 | |||
407 | /* a sequence header should be found before returning from `getheader' the */ | ||
408 | /* first time (this is to set horizontal/vertical size properly) */ | ||
409 | |||
410 | /* Repeat the frame until it's less than 1 count from repeat_count */ | ||
411 | if(video->repeat_count - video->current_repeat >= 100 && !dont_repeat) | ||
412 | { | ||
413 | return 0; | ||
414 | } | ||
415 | |||
416 | if(dont_repeat) | ||
417 | { | ||
418 | video->repeat_count = 0; | ||
419 | video->current_repeat = 0; | ||
420 | } | ||
421 | else | ||
422 | video->repeat_count -= video->current_repeat; | ||
423 | |||
424 | while(1) | ||
425 | { | ||
426 | /* look for startcode */ | ||
427 | code = mpeg3bits_next_startcode(video->vstream); | ||
428 | if(mpeg3bits_eof(video->vstream)) return 1; | ||
429 | if(code != MPEG3_SEQUENCE_END_CODE) mpeg3bits_refill(video->vstream); | ||
430 | |||
431 | switch(code) | ||
432 | { | ||
433 | case MPEG3_SEQUENCE_START_CODE: | ||
434 | video->found_seqhdr = 1; | ||
435 | mpeg3video_getseqhdr(video); | ||
436 | mpeg3video_ext_user_data(video); | ||
437 | break; | ||
438 | |||
439 | case MPEG3_GOP_START_CODE: | ||
440 | mpeg3video_getgophdr(video); | ||
441 | mpeg3video_ext_user_data(video); | ||
442 | break; | ||
443 | |||
444 | case MPEG3_PICTURE_START_CODE: | ||
445 | mpeg3video_getpicturehdr(video); | ||
446 | mpeg3video_ext_user_data(video); | ||
447 | if(video->found_seqhdr) return 0; /* Exit here */ | ||
448 | break; | ||
449 | |||
450 | case MPEG3_SEQUENCE_END_CODE: | ||
451 | // Continue until the end | ||
452 | mpeg3bits_refill(video->vstream); | ||
453 | break; | ||
454 | |||
455 | default: | ||
456 | break; | ||
457 | } | ||
458 | } | ||
459 | return 1; /* Shouldn't be reached. */ | ||
460 | } | ||
461 | |||
462 | int mpeg3video_ext_bit_info(mpeg3_slice_buffer_t *slice_buffer) | ||
463 | { | ||
464 | while(mpeg3slice_getbit(slice_buffer)) mpeg3slice_getbyte(slice_buffer); | ||
465 | return 0; | ||
466 | } | ||
467 | |||
468 | /* decode slice header */ | ||
469 | int mpeg3video_getslicehdr(mpeg3_slice_t *slice, mpeg3video_t *video) | ||
470 | { | ||
471 | int slice_vertical_position_extension, intra_slice; | ||
472 | int qs; | ||
473 | |||
474 | slice_vertical_position_extension = (video->mpeg2 && video->vertical_size > 2800) ? | ||
475 | mpeg3slice_getbits(slice->slice_buffer, 3) : 0; | ||
476 | |||
477 | if(video->scalable_mode == SC_DP) slice->pri_brk = mpeg3slice_getbits(slice->slice_buffer, 7); | ||
478 | |||
479 | qs = mpeg3slice_getbits(slice->slice_buffer, 5); | ||
480 | slice->quant_scale = video->mpeg2 ? (video->qscale_type ? mpeg3_non_linear_mquant_table[qs] : (qs << 1)) : qs; | ||
481 | |||
482 | if(mpeg3slice_getbit(slice->slice_buffer)) | ||
483 | { | ||
484 | intra_slice = mpeg3slice_getbit(slice->slice_buffer); | ||
485 | mpeg3slice_getbits(slice->slice_buffer, 7); | ||
486 | mpeg3video_ext_bit_info(slice->slice_buffer); | ||
487 | } | ||
488 | else | ||
489 | intra_slice = 0; | ||
490 | |||
491 | return slice_vertical_position_extension; | ||
492 | } | ||