diff options
Diffstat (limited to 'apps/plugins/mpegplayer/header.c')
-rw-r--r-- | apps/plugins/mpegplayer/header.c | 892 |
1 files changed, 892 insertions, 0 deletions
diff --git a/apps/plugins/mpegplayer/header.c b/apps/plugins/mpegplayer/header.c new file mode 100644 index 0000000000..a5dc27f2f4 --- /dev/null +++ b/apps/plugins/mpegplayer/header.c | |||
@@ -0,0 +1,892 @@ | |||
1 | /* | ||
2 | * header.c | ||
3 | * Copyright (C) 2000-2003 Michel Lespinasse <walken@zoy.org> | ||
4 | * Copyright (C) 2003 Regis Duchesne <hpreg@zoy.org> | ||
5 | * Copyright (C) 1999-2000 Aaron Holtzman <aholtzma@ess.engr.uvic.ca> | ||
6 | * | ||
7 | * This file is part of mpeg2dec, a free MPEG-2 video stream decoder. | ||
8 | * See http://libmpeg2.sourceforge.net/ for updates. | ||
9 | * | ||
10 | * mpeg2dec is free software; you can redistribute it and/or modify | ||
11 | * it under the terms of the GNU General Public License as published by | ||
12 | * the Free Software Foundation; either version 2 of the License, or | ||
13 | * (at your option) any later version. | ||
14 | * | ||
15 | * mpeg2dec is distributed in the hope that it will be useful, | ||
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
18 | * GNU General Public License for more details. | ||
19 | * | ||
20 | * You should have received a copy of the GNU General Public License | ||
21 | * along with this program; if not, write to the Free Software | ||
22 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | ||
23 | */ | ||
24 | |||
25 | #include "plugin.h" | ||
26 | |||
27 | #include "mpeg2dec_config.h" | ||
28 | |||
29 | extern struct plugin_api* rb; | ||
30 | |||
31 | #include "mpeg2.h" | ||
32 | #include "attributes.h" | ||
33 | #include "mpeg2_internal.h" | ||
34 | |||
35 | #define SEQ_EXT 2 | ||
36 | #define SEQ_DISPLAY_EXT 4 | ||
37 | #define QUANT_MATRIX_EXT 8 | ||
38 | #define COPYRIGHT_EXT 0x10 | ||
39 | #define PIC_DISPLAY_EXT 0x80 | ||
40 | #define PIC_CODING_EXT 0x100 | ||
41 | |||
42 | /* default intra quant matrix, in zig-zag order */ | ||
43 | static const uint8_t default_intra_quantizer_matrix[64] IBSS_ATTR = { | ||
44 | 8, | ||
45 | 16, 16, | ||
46 | 19, 16, 19, | ||
47 | 22, 22, 22, 22, | ||
48 | 22, 22, 26, 24, 26, | ||
49 | 27, 27, 27, 26, 26, 26, | ||
50 | 26, 27, 27, 27, 29, 29, 29, | ||
51 | 34, 34, 34, 29, 29, 29, 27, 27, | ||
52 | 29, 29, 32, 32, 34, 34, 37, | ||
53 | 38, 37, 35, 35, 34, 35, | ||
54 | 38, 38, 40, 40, 40, | ||
55 | 48, 48, 46, 46, | ||
56 | 56, 56, 58, | ||
57 | 69, 69, | ||
58 | 83 | ||
59 | }; | ||
60 | |||
61 | uint8_t mpeg2_scan_norm[64] ICONST_ATTR = { | ||
62 | /* Zig-Zag scan pattern */ | ||
63 | 0, 1, 8, 16, 9, 2, 3, 10, 17, 24, 32, 25, 18, 11, 4, 5, | ||
64 | 12, 19, 26, 33, 40, 48, 41, 34, 27, 20, 13, 6, 7, 14, 21, 28, | ||
65 | 35, 42, 49, 56, 57, 50, 43, 36, 29, 22, 15, 23, 30, 37, 44, 51, | ||
66 | 58, 59, 52, 45, 38, 31, 39, 46, 53, 60, 61, 54, 47, 55, 62, 63 | ||
67 | }; | ||
68 | |||
69 | uint8_t mpeg2_scan_alt[64] ICONST_ATTR = { | ||
70 | /* Alternate scan pattern */ | ||
71 | 0, 8, 16, 24, 1, 9, 2, 10, 17, 25, 32, 40, 48, 56, 57, 49, | ||
72 | 41, 33, 26, 18, 3, 11, 4, 12, 19, 27, 34, 42, 50, 58, 35, 43, | ||
73 | 51, 59, 20, 28, 5, 13, 6, 14, 21, 29, 36, 44, 52, 60, 37, 45, | ||
74 | 53, 61, 22, 30, 7, 15, 23, 31, 38, 46, 54, 62, 39, 47, 55, 63 | ||
75 | }; | ||
76 | |||
77 | void mpeg2_header_state_init (mpeg2dec_t * mpeg2dec) | ||
78 | { | ||
79 | if (mpeg2dec->sequence.width != (unsigned)-1) { | ||
80 | int i; | ||
81 | |||
82 | mpeg2dec->sequence.width = (unsigned)-1; | ||
83 | if (!mpeg2dec->custom_fbuf) | ||
84 | for (i = mpeg2dec->alloc_index_user; | ||
85 | i < mpeg2dec->alloc_index; i++) { | ||
86 | mpeg2_free (mpeg2dec->fbuf_alloc[i].fbuf.buf[0]); | ||
87 | mpeg2_free (mpeg2dec->fbuf_alloc[i].fbuf.buf[1]); | ||
88 | mpeg2_free (mpeg2dec->fbuf_alloc[i].fbuf.buf[2]); | ||
89 | } | ||
90 | if (mpeg2dec->convert_start) | ||
91 | for (i = 0; i < 3; i++) { | ||
92 | mpeg2_free (mpeg2dec->yuv_buf[i][0]); | ||
93 | mpeg2_free (mpeg2dec->yuv_buf[i][1]); | ||
94 | mpeg2_free (mpeg2dec->yuv_buf[i][2]); | ||
95 | } | ||
96 | if (mpeg2dec->decoder.convert_id) | ||
97 | mpeg2_free (mpeg2dec->decoder.convert_id); | ||
98 | } | ||
99 | mpeg2dec->decoder.coding_type = I_TYPE; | ||
100 | mpeg2dec->decoder.convert = NULL; | ||
101 | mpeg2dec->decoder.convert_id = NULL; | ||
102 | mpeg2dec->picture = mpeg2dec->pictures; | ||
103 | mpeg2dec->fbuf[0] = &mpeg2dec->fbuf_alloc[0].fbuf; | ||
104 | mpeg2dec->fbuf[1] = &mpeg2dec->fbuf_alloc[1].fbuf; | ||
105 | mpeg2dec->fbuf[2] = &mpeg2dec->fbuf_alloc[2].fbuf; | ||
106 | mpeg2dec->first = 1; | ||
107 | mpeg2dec->alloc_index = 0; | ||
108 | mpeg2dec->alloc_index_user = 0; | ||
109 | mpeg2dec->first_decode_slice = 1; | ||
110 | mpeg2dec->nb_decode_slices = 0xb0 - 1; | ||
111 | mpeg2dec->convert = NULL; | ||
112 | mpeg2dec->convert_start = NULL; | ||
113 | mpeg2dec->custom_fbuf = 0; | ||
114 | mpeg2dec->yuv_index = 0; | ||
115 | } | ||
116 | |||
117 | void mpeg2_reset_info (mpeg2_info_t * info) | ||
118 | { | ||
119 | info->current_picture = info->current_picture_2nd = NULL; | ||
120 | info->display_picture = info->display_picture_2nd = NULL; | ||
121 | info->current_fbuf = info->display_fbuf = info->discard_fbuf = NULL; | ||
122 | } | ||
123 | |||
124 | static void info_user_data (mpeg2dec_t * mpeg2dec) | ||
125 | { | ||
126 | if (mpeg2dec->user_data_len) { | ||
127 | mpeg2dec->info.user_data = mpeg2dec->chunk_buffer; | ||
128 | mpeg2dec->info.user_data_len = mpeg2dec->user_data_len - 3; | ||
129 | } | ||
130 | } | ||
131 | |||
132 | int mpeg2_header_sequence (mpeg2dec_t * mpeg2dec) | ||
133 | { | ||
134 | uint8_t * buffer = mpeg2dec->chunk_start; | ||
135 | mpeg2_sequence_t * sequence = &(mpeg2dec->new_sequence); | ||
136 | static unsigned int frame_period[16] = { | ||
137 | 0, 1126125, 1125000, 1080000, 900900, 900000, 540000, 450450, 450000, | ||
138 | /* unofficial: xing 15 fps */ | ||
139 | 1800000, | ||
140 | /* unofficial: libmpeg3 "Unofficial economy rates" 5/10/12/15 fps */ | ||
141 | 5400000, 2700000, 2250000, 1800000, 0, 0 | ||
142 | }; | ||
143 | int i; | ||
144 | |||
145 | if ((buffer[6] & 0x20) != 0x20) /* missing marker_bit */ | ||
146 | return 1; | ||
147 | |||
148 | i = (buffer[0] << 16) | (buffer[1] << 8) | buffer[2]; | ||
149 | if (! (sequence->display_width = sequence->picture_width = i >> 12)) | ||
150 | return 1; | ||
151 | if (! (sequence->display_height = sequence->picture_height = i & 0xfff)) | ||
152 | return 1; | ||
153 | sequence->width = (sequence->picture_width + 15) & ~15; | ||
154 | sequence->height = (sequence->picture_height + 15) & ~15; | ||
155 | sequence->chroma_width = sequence->width >> 1; | ||
156 | sequence->chroma_height = sequence->height >> 1; | ||
157 | |||
158 | sequence->flags = (SEQ_FLAG_PROGRESSIVE_SEQUENCE | | ||
159 | SEQ_VIDEO_FORMAT_UNSPECIFIED); | ||
160 | |||
161 | sequence->pixel_width = buffer[3] >> 4; /* aspect ratio */ | ||
162 | sequence->frame_period = frame_period[buffer[3] & 15]; | ||
163 | |||
164 | sequence->byte_rate = (buffer[4]<<10) | (buffer[5]<<2) | (buffer[6]>>6); | ||
165 | |||
166 | sequence->vbv_buffer_size = ((buffer[6]<<16)|(buffer[7]<<8))&0x1ff800; | ||
167 | |||
168 | if (buffer[7] & 4) | ||
169 | sequence->flags |= SEQ_FLAG_CONSTRAINED_PARAMETERS; | ||
170 | |||
171 | mpeg2dec->copy_matrix = 3; | ||
172 | if (buffer[7] & 2) { | ||
173 | for (i = 0; i < 64; i++) | ||
174 | mpeg2dec->new_quantizer_matrix[0][mpeg2_scan_norm[i]] = | ||
175 | (buffer[i+7] << 7) | (buffer[i+8] >> 1); | ||
176 | buffer += 64; | ||
177 | } else | ||
178 | for (i = 0; i < 64; i++) | ||
179 | mpeg2dec->new_quantizer_matrix[0][mpeg2_scan_norm[i]] = | ||
180 | default_intra_quantizer_matrix[i]; | ||
181 | |||
182 | if (buffer[7] & 1) | ||
183 | for (i = 0; i < 64; i++) | ||
184 | mpeg2dec->new_quantizer_matrix[1][mpeg2_scan_norm[i]] = | ||
185 | buffer[i+8]; | ||
186 | else | ||
187 | rb->memset (mpeg2dec->new_quantizer_matrix[1], 16, 64); | ||
188 | |||
189 | sequence->profile_level_id = 0x80; | ||
190 | sequence->colour_primaries = 0; | ||
191 | sequence->transfer_characteristics = 0; | ||
192 | sequence->matrix_coefficients = 0; | ||
193 | |||
194 | mpeg2dec->ext_state = SEQ_EXT; | ||
195 | mpeg2dec->state = STATE_SEQUENCE; | ||
196 | mpeg2dec->display_offset_x = mpeg2dec->display_offset_y = 0; | ||
197 | |||
198 | return 0; | ||
199 | } | ||
200 | |||
201 | static int sequence_ext (mpeg2dec_t * mpeg2dec) | ||
202 | { | ||
203 | uint8_t * buffer = mpeg2dec->chunk_start; | ||
204 | mpeg2_sequence_t * sequence = &(mpeg2dec->new_sequence); | ||
205 | uint32_t flags; | ||
206 | |||
207 | if (!(buffer[3] & 1)) | ||
208 | return 1; | ||
209 | |||
210 | sequence->profile_level_id = (buffer[0] << 4) | (buffer[1] >> 4); | ||
211 | |||
212 | sequence->display_width = sequence->picture_width += | ||
213 | ((buffer[1] << 13) | (buffer[2] << 5)) & 0x3000; | ||
214 | sequence->display_height = sequence->picture_height += | ||
215 | (buffer[2] << 7) & 0x3000; | ||
216 | sequence->width = (sequence->picture_width + 15) & ~15; | ||
217 | sequence->height = (sequence->picture_height + 15) & ~15; | ||
218 | flags = sequence->flags | SEQ_FLAG_MPEG2; | ||
219 | if (!(buffer[1] & 8)) { | ||
220 | flags &= ~SEQ_FLAG_PROGRESSIVE_SEQUENCE; | ||
221 | sequence->height = (sequence->height + 31) & ~31; | ||
222 | } | ||
223 | if (buffer[5] & 0x80) | ||
224 | flags |= SEQ_FLAG_LOW_DELAY; | ||
225 | sequence->flags = flags; | ||
226 | sequence->chroma_width = sequence->width; | ||
227 | sequence->chroma_height = sequence->height; | ||
228 | switch (buffer[1] & 6) { | ||
229 | case 0: /* invalid */ | ||
230 | return 1; | ||
231 | case 2: /* 4:2:0 */ | ||
232 | sequence->chroma_height >>= 1; | ||
233 | case 4: /* 4:2:2 */ | ||
234 | sequence->chroma_width >>= 1; | ||
235 | } | ||
236 | |||
237 | sequence->byte_rate += ((buffer[2]<<25) | (buffer[3]<<17)) & 0x3ffc0000; | ||
238 | |||
239 | sequence->vbv_buffer_size |= buffer[4] << 21; | ||
240 | |||
241 | sequence->frame_period = | ||
242 | sequence->frame_period * ((buffer[5]&31)+1) / (((buffer[5]>>2)&3)+1); | ||
243 | |||
244 | mpeg2dec->ext_state = SEQ_DISPLAY_EXT; | ||
245 | |||
246 | return 0; | ||
247 | } | ||
248 | |||
249 | static int sequence_display_ext (mpeg2dec_t * mpeg2dec) | ||
250 | { | ||
251 | uint8_t * buffer = mpeg2dec->chunk_start; | ||
252 | mpeg2_sequence_t * sequence = &(mpeg2dec->new_sequence); | ||
253 | uint32_t flags; | ||
254 | |||
255 | flags = ((sequence->flags & ~SEQ_MASK_VIDEO_FORMAT) | | ||
256 | ((buffer[0]<<4) & SEQ_MASK_VIDEO_FORMAT)); | ||
257 | if (buffer[0] & 1) { | ||
258 | flags |= SEQ_FLAG_COLOUR_DESCRIPTION; | ||
259 | sequence->colour_primaries = buffer[1]; | ||
260 | sequence->transfer_characteristics = buffer[2]; | ||
261 | sequence->matrix_coefficients = buffer[3]; | ||
262 | buffer += 3; | ||
263 | } | ||
264 | |||
265 | if (!(buffer[2] & 2)) /* missing marker_bit */ | ||
266 | return 1; | ||
267 | |||
268 | sequence->display_width = (buffer[1] << 6) | (buffer[2] >> 2); | ||
269 | sequence->display_height = | ||
270 | ((buffer[2]& 1 ) << 13) | (buffer[3] << 5) | (buffer[4] >> 3); | ||
271 | |||
272 | return 0; | ||
273 | } | ||
274 | |||
275 | static inline void finalize_sequence (mpeg2_sequence_t * sequence) | ||
276 | { | ||
277 | int width; | ||
278 | int height; | ||
279 | |||
280 | sequence->byte_rate *= 50; | ||
281 | |||
282 | if (sequence->flags & SEQ_FLAG_MPEG2) { | ||
283 | switch (sequence->pixel_width) { | ||
284 | case 1: /* square pixels */ | ||
285 | sequence->pixel_width = sequence->pixel_height = 1; return; | ||
286 | case 2: /* 4:3 aspect ratio */ | ||
287 | width = 4; height = 3; break; | ||
288 | case 3: /* 16:9 aspect ratio */ | ||
289 | width = 16; height = 9; break; | ||
290 | case 4: /* 2.21:1 aspect ratio */ | ||
291 | width = 221; height = 100; break; | ||
292 | default: /* illegal */ | ||
293 | sequence->pixel_width = sequence->pixel_height = 0; return; | ||
294 | } | ||
295 | width *= sequence->display_height; | ||
296 | height *= sequence->display_width; | ||
297 | |||
298 | } else { | ||
299 | if (sequence->byte_rate == 50 * 0x3ffff) | ||
300 | sequence->byte_rate = 0; /* mpeg-1 VBR */ | ||
301 | |||
302 | switch (sequence->pixel_width) { | ||
303 | case 0: case 15: /* illegal */ | ||
304 | sequence->pixel_width = sequence->pixel_height = 0; return; | ||
305 | case 1: /* square pixels */ | ||
306 | sequence->pixel_width = sequence->pixel_height = 1; return; | ||
307 | case 3: /* 720x576 16:9 */ | ||
308 | sequence->pixel_width = 64; sequence->pixel_height = 45; return; | ||
309 | case 6: /* 720x480 16:9 */ | ||
310 | sequence->pixel_width = 32; sequence->pixel_height = 27; return; | ||
311 | case 12: /* 720*480 4:3 */ | ||
312 | sequence->pixel_width = 8; sequence->pixel_height = 9; return; | ||
313 | default: | ||
314 | height = 88 * sequence->pixel_width + 1171; | ||
315 | width = 2000; | ||
316 | } | ||
317 | } | ||
318 | |||
319 | sequence->pixel_width = width; | ||
320 | sequence->pixel_height = height; | ||
321 | while (width) { /* find greatest common divisor */ | ||
322 | int tmp = width; | ||
323 | width = height % tmp; | ||
324 | height = tmp; | ||
325 | } | ||
326 | sequence->pixel_width /= height; | ||
327 | sequence->pixel_height /= height; | ||
328 | } | ||
329 | |||
330 | static void copy_matrix (mpeg2dec_t * mpeg2dec, int index) | ||
331 | { | ||
332 | if (rb->memcmp (mpeg2dec->quantizer_matrix[index], | ||
333 | mpeg2dec->new_quantizer_matrix[index], 64)) { | ||
334 | rb->memcpy (mpeg2dec->quantizer_matrix[index], | ||
335 | mpeg2dec->new_quantizer_matrix[index], 64); | ||
336 | mpeg2dec->scaled[index] = -1; | ||
337 | } | ||
338 | } | ||
339 | |||
340 | static void finalize_matrix (mpeg2dec_t * mpeg2dec) | ||
341 | { | ||
342 | mpeg2_decoder_t * decoder = &(mpeg2dec->decoder); | ||
343 | int i; | ||
344 | |||
345 | for (i = 0; i < 2; i++) { | ||
346 | if (mpeg2dec->copy_matrix & (1 << i)) | ||
347 | copy_matrix (mpeg2dec, i); | ||
348 | if ((mpeg2dec->copy_matrix & (4 << i)) && | ||
349 | rb->memcmp (mpeg2dec->quantizer_matrix[i], | ||
350 | mpeg2dec->new_quantizer_matrix[i+2], 64)) { | ||
351 | copy_matrix (mpeg2dec, i + 2); | ||
352 | decoder->chroma_quantizer[i] = decoder->quantizer_prescale[i+2]; | ||
353 | } else if (mpeg2dec->copy_matrix & (5 << i)) | ||
354 | decoder->chroma_quantizer[i] = decoder->quantizer_prescale[i]; | ||
355 | } | ||
356 | } | ||
357 | |||
358 | static mpeg2_state_t invalid_end_action (mpeg2dec_t * mpeg2dec) | ||
359 | { | ||
360 | mpeg2_reset_info (&(mpeg2dec->info)); | ||
361 | mpeg2dec->info.gop = NULL; | ||
362 | info_user_data (mpeg2dec); | ||
363 | mpeg2_header_state_init (mpeg2dec); | ||
364 | mpeg2dec->sequence = mpeg2dec->new_sequence; | ||
365 | mpeg2dec->action = mpeg2_seek_header; | ||
366 | mpeg2dec->state = STATE_SEQUENCE; | ||
367 | return STATE_SEQUENCE; | ||
368 | } | ||
369 | |||
370 | void mpeg2_header_sequence_finalize (mpeg2dec_t * mpeg2dec) | ||
371 | { | ||
372 | mpeg2_sequence_t * sequence = &(mpeg2dec->new_sequence); | ||
373 | mpeg2_decoder_t * decoder = &(mpeg2dec->decoder); | ||
374 | |||
375 | finalize_sequence (sequence); | ||
376 | finalize_matrix (mpeg2dec); | ||
377 | |||
378 | decoder->mpeg1 = !(sequence->flags & SEQ_FLAG_MPEG2); | ||
379 | decoder->width = sequence->width; | ||
380 | decoder->height = sequence->height; | ||
381 | decoder->vertical_position_extension = (sequence->picture_height > 2800); | ||
382 | decoder->chroma_format = ((sequence->chroma_width == sequence->width) + | ||
383 | (sequence->chroma_height == sequence->height)); | ||
384 | |||
385 | if (mpeg2dec->sequence.width != (unsigned)-1) { | ||
386 | unsigned int new_byte_rate; | ||
387 | |||
388 | /* | ||
389 | * According to 6.1.1.6, repeat sequence headers should be | ||
390 | * identical to the original. However some DVDs dont respect | ||
391 | * that and have different bitrates in the repeat sequence | ||
392 | * headers. So we'll ignore that in the comparison and still | ||
393 | * consider these as repeat sequence headers. | ||
394 | * | ||
395 | * However, be careful not to alter the current sequence when | ||
396 | * returning STATE_INVALID_END. | ||
397 | */ | ||
398 | new_byte_rate = sequence->byte_rate; | ||
399 | sequence->byte_rate = mpeg2dec->sequence.byte_rate; | ||
400 | if (rb->memcmp (&(mpeg2dec->sequence), sequence, | ||
401 | sizeof (mpeg2_sequence_t))) { | ||
402 | decoder->stride_frame = sequence->width; | ||
403 | sequence->byte_rate = new_byte_rate; | ||
404 | mpeg2_header_end (mpeg2dec); | ||
405 | mpeg2dec->action = invalid_end_action; | ||
406 | mpeg2dec->state = STATE_INVALID_END; | ||
407 | return; | ||
408 | } | ||
409 | sequence->byte_rate = new_byte_rate; | ||
410 | mpeg2dec->state = STATE_SEQUENCE_REPEATED; | ||
411 | } else | ||
412 | decoder->stride_frame = sequence->width; | ||
413 | mpeg2dec->sequence = *sequence; | ||
414 | mpeg2_reset_info (&(mpeg2dec->info)); | ||
415 | mpeg2dec->info.sequence = &(mpeg2dec->sequence); | ||
416 | mpeg2dec->info.gop = NULL; | ||
417 | info_user_data (mpeg2dec); | ||
418 | } | ||
419 | |||
420 | int mpeg2_header_gop (mpeg2dec_t * mpeg2dec) | ||
421 | { | ||
422 | uint8_t * buffer = mpeg2dec->chunk_start; | ||
423 | mpeg2_gop_t * gop = &(mpeg2dec->new_gop); | ||
424 | |||
425 | if (! (buffer[1] & 8)) | ||
426 | return 1; | ||
427 | gop->hours = (buffer[0] >> 2) & 31; | ||
428 | gop->minutes = ((buffer[0] << 4) | (buffer[1] >> 4)) & 63; | ||
429 | gop->seconds = ((buffer[1] << 3) | (buffer[2] >> 5)) & 63; | ||
430 | gop->pictures = ((buffer[2] << 1) | (buffer[3] >> 7)) & 63; | ||
431 | gop->flags = (buffer[0] >> 7) | ((buffer[3] >> 4) & 6); | ||
432 | mpeg2dec->state = STATE_GOP; | ||
433 | return 0; | ||
434 | } | ||
435 | |||
436 | void mpeg2_header_gop_finalize (mpeg2dec_t * mpeg2dec) | ||
437 | { | ||
438 | mpeg2dec->gop = mpeg2dec->new_gop; | ||
439 | mpeg2_reset_info (&(mpeg2dec->info)); | ||
440 | mpeg2dec->info.gop = &(mpeg2dec->gop); | ||
441 | info_user_data (mpeg2dec); | ||
442 | } | ||
443 | |||
444 | void mpeg2_set_fbuf (mpeg2dec_t * mpeg2dec, int b_type) | ||
445 | { | ||
446 | int i; | ||
447 | |||
448 | for (i = 0; i < 3; i++) | ||
449 | if (mpeg2dec->fbuf[1] != &mpeg2dec->fbuf_alloc[i].fbuf && | ||
450 | mpeg2dec->fbuf[2] != &mpeg2dec->fbuf_alloc[i].fbuf) { | ||
451 | mpeg2dec->fbuf[0] = &mpeg2dec->fbuf_alloc[i].fbuf; | ||
452 | mpeg2dec->info.current_fbuf = mpeg2dec->fbuf[0]; | ||
453 | if (b_type || (mpeg2dec->sequence.flags & SEQ_FLAG_LOW_DELAY)) { | ||
454 | if (b_type || mpeg2dec->convert) | ||
455 | mpeg2dec->info.discard_fbuf = mpeg2dec->fbuf[0]; | ||
456 | mpeg2dec->info.display_fbuf = mpeg2dec->fbuf[0]; | ||
457 | } | ||
458 | break; | ||
459 | } | ||
460 | } | ||
461 | |||
462 | mpeg2_state_t mpeg2_header_picture_start (mpeg2dec_t * mpeg2dec) | ||
463 | { | ||
464 | mpeg2_picture_t * picture = &(mpeg2dec->new_picture); | ||
465 | |||
466 | mpeg2dec->state = ((mpeg2dec->state != STATE_SLICE_1ST) ? | ||
467 | STATE_PICTURE : STATE_PICTURE_2ND); | ||
468 | picture->flags = 0; | ||
469 | picture->tag = picture->tag2 = 0; | ||
470 | if (mpeg2dec->num_tags) { | ||
471 | if (mpeg2dec->bytes_since_tag >= 4) { | ||
472 | mpeg2dec->num_tags = 0; | ||
473 | picture->tag = mpeg2dec->tag_current; | ||
474 | picture->tag2 = mpeg2dec->tag2_current; | ||
475 | picture->flags = PIC_FLAG_TAGS; | ||
476 | } else if (mpeg2dec->num_tags > 1) { | ||
477 | mpeg2dec->num_tags = 1; | ||
478 | picture->tag = mpeg2dec->tag_previous; | ||
479 | picture->tag2 = mpeg2dec->tag2_previous; | ||
480 | picture->flags = PIC_FLAG_TAGS; | ||
481 | } | ||
482 | } | ||
483 | picture->display_offset[0].x = picture->display_offset[1].x = | ||
484 | picture->display_offset[2].x = mpeg2dec->display_offset_x; | ||
485 | picture->display_offset[0].y = picture->display_offset[1].y = | ||
486 | picture->display_offset[2].y = mpeg2dec->display_offset_y; | ||
487 | return mpeg2_parse_header (mpeg2dec); | ||
488 | } | ||
489 | |||
490 | int mpeg2_header_picture (mpeg2dec_t * mpeg2dec) | ||
491 | { | ||
492 | uint8_t * buffer = mpeg2dec->chunk_start; | ||
493 | mpeg2_picture_t * picture = &(mpeg2dec->new_picture); | ||
494 | mpeg2_decoder_t * decoder = &(mpeg2dec->decoder); | ||
495 | int type; | ||
496 | |||
497 | type = (buffer [1] >> 3) & 7; | ||
498 | mpeg2dec->ext_state = PIC_CODING_EXT; | ||
499 | |||
500 | picture->temporal_reference = (buffer[0] << 2) | (buffer[1] >> 6); | ||
501 | |||
502 | picture->flags |= type; | ||
503 | |||
504 | if (type == PIC_FLAG_CODING_TYPE_P || type == PIC_FLAG_CODING_TYPE_B) { | ||
505 | /* forward_f_code and backward_f_code - used in mpeg1 only */ | ||
506 | decoder->f_motion.f_code[1] = (buffer[3] >> 2) & 1; | ||
507 | decoder->f_motion.f_code[0] = | ||
508 | (((buffer[3] << 1) | (buffer[4] >> 7)) & 7) - 1; | ||
509 | decoder->b_motion.f_code[1] = (buffer[4] >> 6) & 1; | ||
510 | decoder->b_motion.f_code[0] = ((buffer[4] >> 3) & 7) - 1; | ||
511 | } | ||
512 | |||
513 | /* XXXXXX decode extra_information_picture as well */ | ||
514 | |||
515 | picture->nb_fields = 2; | ||
516 | |||
517 | mpeg2dec->q_scale_type = 0; | ||
518 | decoder->intra_dc_precision = 7; | ||
519 | decoder->frame_pred_frame_dct = 1; | ||
520 | decoder->concealment_motion_vectors = 0; | ||
521 | decoder->scan = mpeg2_scan_norm; | ||
522 | decoder->picture_structure = FRAME_PICTURE; | ||
523 | mpeg2dec->copy_matrix = 0; | ||
524 | |||
525 | return 0; | ||
526 | } | ||
527 | |||
528 | static int picture_coding_ext (mpeg2dec_t * mpeg2dec) | ||
529 | { | ||
530 | uint8_t * buffer = mpeg2dec->chunk_start; | ||
531 | mpeg2_picture_t * picture = &(mpeg2dec->new_picture); | ||
532 | mpeg2_decoder_t * decoder = &(mpeg2dec->decoder); | ||
533 | uint32_t flags; | ||
534 | |||
535 | /* pre subtract 1 for use later in compute_motion_vector */ | ||
536 | decoder->f_motion.f_code[0] = (buffer[0] & 15) - 1; | ||
537 | decoder->f_motion.f_code[1] = (buffer[1] >> 4) - 1; | ||
538 | decoder->b_motion.f_code[0] = (buffer[1] & 15) - 1; | ||
539 | decoder->b_motion.f_code[1] = (buffer[2] >> 4) - 1; | ||
540 | |||
541 | flags = picture->flags; | ||
542 | decoder->intra_dc_precision = 7 - ((buffer[2] >> 2) & 3); | ||
543 | decoder->picture_structure = buffer[2] & 3; | ||
544 | switch (decoder->picture_structure) { | ||
545 | case TOP_FIELD: | ||
546 | flags |= PIC_FLAG_TOP_FIELD_FIRST; | ||
547 | case BOTTOM_FIELD: | ||
548 | picture->nb_fields = 1; | ||
549 | break; | ||
550 | case FRAME_PICTURE: | ||
551 | if (!(mpeg2dec->sequence.flags & SEQ_FLAG_PROGRESSIVE_SEQUENCE)) { | ||
552 | picture->nb_fields = (buffer[3] & 2) ? 3 : 2; | ||
553 | flags |= (buffer[3] & 128) ? PIC_FLAG_TOP_FIELD_FIRST : 0; | ||
554 | } else | ||
555 | picture->nb_fields = (buffer[3]&2) ? ((buffer[3]&128) ? 6 : 4) : 2; | ||
556 | break; | ||
557 | default: | ||
558 | return 1; | ||
559 | } | ||
560 | decoder->top_field_first = buffer[3] >> 7; | ||
561 | decoder->frame_pred_frame_dct = (buffer[3] >> 6) & 1; | ||
562 | decoder->concealment_motion_vectors = (buffer[3] >> 5) & 1; | ||
563 | mpeg2dec->q_scale_type = buffer[3] & 16; | ||
564 | decoder->intra_vlc_format = (buffer[3] >> 3) & 1; | ||
565 | decoder->scan = (buffer[3] & 4) ? mpeg2_scan_alt : mpeg2_scan_norm; | ||
566 | flags |= (buffer[4] & 0x80) ? PIC_FLAG_PROGRESSIVE_FRAME : 0; | ||
567 | if (buffer[4] & 0x40) | ||
568 | flags |= (((buffer[4]<<26) | (buffer[5]<<18) | (buffer[6]<<10)) & | ||
569 | PIC_MASK_COMPOSITE_DISPLAY) | PIC_FLAG_COMPOSITE_DISPLAY; | ||
570 | picture->flags = flags; | ||
571 | |||
572 | mpeg2dec->ext_state = PIC_DISPLAY_EXT | COPYRIGHT_EXT | QUANT_MATRIX_EXT; | ||
573 | |||
574 | return 0; | ||
575 | } | ||
576 | |||
577 | static int picture_display_ext (mpeg2dec_t * mpeg2dec) | ||
578 | { | ||
579 | uint8_t * buffer = mpeg2dec->chunk_start; | ||
580 | mpeg2_picture_t * picture = &(mpeg2dec->new_picture); | ||
581 | int i, nb_pos; | ||
582 | |||
583 | nb_pos = picture->nb_fields; | ||
584 | if (mpeg2dec->sequence.flags & SEQ_FLAG_PROGRESSIVE_SEQUENCE) | ||
585 | nb_pos >>= 1; | ||
586 | |||
587 | for (i = 0; i < nb_pos; i++) { | ||
588 | int x, y; | ||
589 | |||
590 | x = ((buffer[4*i] << 24) | (buffer[4*i+1] << 16) | | ||
591 | (buffer[4*i+2] << 8) | buffer[4*i+3]) >> (11-2*i); | ||
592 | y = ((buffer[4*i+2] << 24) | (buffer[4*i+3] << 16) | | ||
593 | (buffer[4*i+4] << 8) | buffer[4*i+5]) >> (10-2*i); | ||
594 | if (! (x & y & 1)) | ||
595 | return 1; | ||
596 | picture->display_offset[i].x = mpeg2dec->display_offset_x = x >> 1; | ||
597 | picture->display_offset[i].y = mpeg2dec->display_offset_y = y >> 1; | ||
598 | } | ||
599 | for (; i < 3; i++) { | ||
600 | picture->display_offset[i].x = mpeg2dec->display_offset_x; | ||
601 | picture->display_offset[i].y = mpeg2dec->display_offset_y; | ||
602 | } | ||
603 | return 0; | ||
604 | } | ||
605 | |||
606 | void mpeg2_header_picture_finalize (mpeg2dec_t * mpeg2dec, uint32_t accels) | ||
607 | { | ||
608 | mpeg2_decoder_t * decoder = &(mpeg2dec->decoder); | ||
609 | int old_type_b = (decoder->coding_type == B_TYPE); | ||
610 | int low_delay = mpeg2dec->sequence.flags & SEQ_FLAG_LOW_DELAY; | ||
611 | |||
612 | finalize_matrix (mpeg2dec); | ||
613 | decoder->coding_type = mpeg2dec->new_picture.flags & PIC_MASK_CODING_TYPE; | ||
614 | |||
615 | if (mpeg2dec->state == STATE_PICTURE) { | ||
616 | mpeg2_picture_t * picture; | ||
617 | mpeg2_picture_t * other; | ||
618 | |||
619 | decoder->second_field = 0; | ||
620 | |||
621 | picture = other = mpeg2dec->pictures; | ||
622 | if (old_type_b ^ (mpeg2dec->picture < mpeg2dec->pictures + 2)) | ||
623 | picture += 2; | ||
624 | else | ||
625 | other += 2; | ||
626 | mpeg2dec->picture = picture; | ||
627 | *picture = mpeg2dec->new_picture; | ||
628 | |||
629 | if (!old_type_b) { | ||
630 | mpeg2dec->fbuf[2] = mpeg2dec->fbuf[1]; | ||
631 | mpeg2dec->fbuf[1] = mpeg2dec->fbuf[0]; | ||
632 | } | ||
633 | mpeg2dec->fbuf[0] = NULL; | ||
634 | mpeg2_reset_info (&(mpeg2dec->info)); | ||
635 | mpeg2dec->info.current_picture = picture; | ||
636 | mpeg2dec->info.display_picture = picture; | ||
637 | if (decoder->coding_type != B_TYPE) { | ||
638 | if (!low_delay) { | ||
639 | if (mpeg2dec->first) { | ||
640 | mpeg2dec->info.display_picture = NULL; | ||
641 | mpeg2dec->first = 0; | ||
642 | } else { | ||
643 | mpeg2dec->info.display_picture = other; | ||
644 | if (other->nb_fields == 1) | ||
645 | mpeg2dec->info.display_picture_2nd = other + 1; | ||
646 | mpeg2dec->info.display_fbuf = mpeg2dec->fbuf[1]; | ||
647 | } | ||
648 | } | ||
649 | if (!low_delay + !mpeg2dec->convert) | ||
650 | mpeg2dec->info.discard_fbuf = | ||
651 | mpeg2dec->fbuf[!low_delay + !mpeg2dec->convert]; | ||
652 | } | ||
653 | if (mpeg2dec->convert) { | ||
654 | mpeg2_convert_init_t convert_init; | ||
655 | if (!mpeg2dec->convert_start) { | ||
656 | int y_size, uv_size; | ||
657 | |||
658 | mpeg2dec->decoder.convert_id = | ||
659 | mpeg2_malloc (mpeg2dec->convert_id_size, | ||
660 | MPEG2_ALLOC_CONVERT_ID); | ||
661 | mpeg2dec->convert (MPEG2_CONVERT_START, | ||
662 | mpeg2dec->decoder.convert_id, | ||
663 | &(mpeg2dec->sequence), | ||
664 | mpeg2dec->convert_stride, accels, | ||
665 | mpeg2dec->convert_arg, &convert_init); | ||
666 | mpeg2dec->convert_start = convert_init.start; | ||
667 | mpeg2dec->decoder.convert = convert_init.copy; | ||
668 | |||
669 | y_size = decoder->stride_frame * mpeg2dec->sequence.height; | ||
670 | uv_size = y_size >> (2 - mpeg2dec->decoder.chroma_format); | ||
671 | mpeg2dec->yuv_buf[0][0] = | ||
672 | (uint8_t *) mpeg2_malloc (y_size, MPEG2_ALLOC_YUV); | ||
673 | mpeg2dec->yuv_buf[0][1] = | ||
674 | (uint8_t *) mpeg2_malloc (uv_size, MPEG2_ALLOC_YUV); | ||
675 | mpeg2dec->yuv_buf[0][2] = | ||
676 | (uint8_t *) mpeg2_malloc (uv_size, MPEG2_ALLOC_YUV); | ||
677 | mpeg2dec->yuv_buf[1][0] = | ||
678 | (uint8_t *) mpeg2_malloc (y_size, MPEG2_ALLOC_YUV); | ||
679 | mpeg2dec->yuv_buf[1][1] = | ||
680 | (uint8_t *) mpeg2_malloc (uv_size, MPEG2_ALLOC_YUV); | ||
681 | mpeg2dec->yuv_buf[1][2] = | ||
682 | (uint8_t *) mpeg2_malloc (uv_size, MPEG2_ALLOC_YUV); | ||
683 | y_size = decoder->stride_frame * 32; | ||
684 | uv_size = y_size >> (2 - mpeg2dec->decoder.chroma_format); | ||
685 | mpeg2dec->yuv_buf[2][0] = | ||
686 | (uint8_t *) mpeg2_malloc (y_size, MPEG2_ALLOC_YUV); | ||
687 | mpeg2dec->yuv_buf[2][1] = | ||
688 | (uint8_t *) mpeg2_malloc (uv_size, MPEG2_ALLOC_YUV); | ||
689 | mpeg2dec->yuv_buf[2][2] = | ||
690 | (uint8_t *) mpeg2_malloc (uv_size, MPEG2_ALLOC_YUV); | ||
691 | } | ||
692 | if (!mpeg2dec->custom_fbuf) { | ||
693 | while (mpeg2dec->alloc_index < 3) { | ||
694 | mpeg2_fbuf_t * fbuf; | ||
695 | |||
696 | fbuf = &mpeg2dec->fbuf_alloc[mpeg2dec->alloc_index++].fbuf; | ||
697 | fbuf->id = NULL; | ||
698 | fbuf->buf[0] = | ||
699 | (uint8_t *) mpeg2_malloc (convert_init.buf_size[0], | ||
700 | MPEG2_ALLOC_CONVERTED); | ||
701 | fbuf->buf[1] = | ||
702 | (uint8_t *) mpeg2_malloc (convert_init.buf_size[1], | ||
703 | MPEG2_ALLOC_CONVERTED); | ||
704 | fbuf->buf[2] = | ||
705 | (uint8_t *) mpeg2_malloc (convert_init.buf_size[2], | ||
706 | MPEG2_ALLOC_CONVERTED); | ||
707 | } | ||
708 | mpeg2_set_fbuf (mpeg2dec, (decoder->coding_type == B_TYPE)); | ||
709 | } | ||
710 | } else if (!mpeg2dec->custom_fbuf) { | ||
711 | while (mpeg2dec->alloc_index < 3) { | ||
712 | mpeg2_fbuf_t * fbuf; | ||
713 | int y_size, uv_size; | ||
714 | |||
715 | fbuf = &(mpeg2dec->fbuf_alloc[mpeg2dec->alloc_index++].fbuf); | ||
716 | fbuf->id = NULL; | ||
717 | y_size = decoder->stride_frame * mpeg2dec->sequence.height; | ||
718 | uv_size = y_size >> (2 - decoder->chroma_format); | ||
719 | fbuf->buf[0] = (uint8_t *) mpeg2_malloc (y_size, | ||
720 | MPEG2_ALLOC_YUV); | ||
721 | fbuf->buf[1] = (uint8_t *) mpeg2_malloc (uv_size, | ||
722 | MPEG2_ALLOC_YUV); | ||
723 | fbuf->buf[2] = (uint8_t *) mpeg2_malloc (uv_size, | ||
724 | MPEG2_ALLOC_YUV); | ||
725 | } | ||
726 | mpeg2_set_fbuf (mpeg2dec, (decoder->coding_type == B_TYPE)); | ||
727 | } | ||
728 | } else { | ||
729 | decoder->second_field = 1; | ||
730 | mpeg2dec->picture++; /* second field picture */ | ||
731 | *(mpeg2dec->picture) = mpeg2dec->new_picture; | ||
732 | mpeg2dec->info.current_picture_2nd = mpeg2dec->picture; | ||
733 | if (low_delay || decoder->coding_type == B_TYPE) | ||
734 | mpeg2dec->info.display_picture_2nd = mpeg2dec->picture; | ||
735 | } | ||
736 | |||
737 | info_user_data (mpeg2dec); | ||
738 | } | ||
739 | |||
740 | static int copyright_ext (mpeg2dec_t * mpeg2dec) | ||
741 | { | ||
742 | (void)mpeg2dec; | ||
743 | return 0; | ||
744 | } | ||
745 | |||
746 | static int quant_matrix_ext (mpeg2dec_t * mpeg2dec) | ||
747 | { | ||
748 | uint8_t * buffer = mpeg2dec->chunk_start; | ||
749 | int i, j; | ||
750 | |||
751 | for (i = 0; i < 4; i++) | ||
752 | if (buffer[0] & (8 >> i)) { | ||
753 | for (j = 0; j < 64; j++) | ||
754 | mpeg2dec->new_quantizer_matrix[i][mpeg2_scan_norm[j]] = | ||
755 | (buffer[j] << (i+5)) | (buffer[j+1] >> (3-i)); | ||
756 | mpeg2dec->copy_matrix |= 1 << i; | ||
757 | buffer += 64; | ||
758 | } | ||
759 | |||
760 | return 0; | ||
761 | } | ||
762 | |||
763 | int mpeg2_header_extension (mpeg2dec_t * mpeg2dec) | ||
764 | { | ||
765 | static int (* parser[]) (mpeg2dec_t *) = { | ||
766 | 0, sequence_ext, sequence_display_ext, quant_matrix_ext, | ||
767 | copyright_ext, 0, 0, picture_display_ext, picture_coding_ext | ||
768 | }; | ||
769 | int ext, ext_bit; | ||
770 | |||
771 | ext = mpeg2dec->chunk_start[0] >> 4; | ||
772 | ext_bit = 1 << ext; | ||
773 | |||
774 | if (!(mpeg2dec->ext_state & ext_bit)) | ||
775 | return 0; /* ignore illegal extensions */ | ||
776 | mpeg2dec->ext_state &= ~ext_bit; | ||
777 | return parser[ext] (mpeg2dec); | ||
778 | } | ||
779 | |||
780 | int mpeg2_header_user_data (mpeg2dec_t * mpeg2dec) | ||
781 | { | ||
782 | mpeg2dec->user_data_len += mpeg2dec->chunk_ptr - 1 - mpeg2dec->chunk_start; | ||
783 | mpeg2dec->chunk_start = mpeg2dec->chunk_ptr - 1; | ||
784 | |||
785 | return 0; | ||
786 | } | ||
787 | |||
788 | static void prescale (mpeg2dec_t * mpeg2dec, int index) | ||
789 | { | ||
790 | static int non_linear_scale [] = { | ||
791 | 0, 1, 2, 3, 4, 5, 6, 7, | ||
792 | 8, 10, 12, 14, 16, 18, 20, 22, | ||
793 | 24, 28, 32, 36, 40, 44, 48, 52, | ||
794 | 56, 64, 72, 80, 88, 96, 104, 112 | ||
795 | }; | ||
796 | int i, j, k; | ||
797 | mpeg2_decoder_t * decoder = &(mpeg2dec->decoder); | ||
798 | |||
799 | if (mpeg2dec->scaled[index] != mpeg2dec->q_scale_type) { | ||
800 | mpeg2dec->scaled[index] = mpeg2dec->q_scale_type; | ||
801 | for (i = 0; i < 32; i++) { | ||
802 | k = mpeg2dec->q_scale_type ? non_linear_scale[i] : (i << 1); | ||
803 | for (j = 0; j < 64; j++) | ||
804 | decoder->quantizer_prescale[index][i][j] = | ||
805 | k * mpeg2dec->quantizer_matrix[index][j]; | ||
806 | } | ||
807 | } | ||
808 | } | ||
809 | |||
810 | mpeg2_state_t mpeg2_header_slice_start (mpeg2dec_t * mpeg2dec) | ||
811 | { | ||
812 | mpeg2_decoder_t * decoder = &(mpeg2dec->decoder); | ||
813 | |||
814 | mpeg2dec->info.user_data = NULL; mpeg2dec->info.user_data_len = 0; | ||
815 | mpeg2dec->state = ((mpeg2dec->picture->nb_fields > 1 || | ||
816 | mpeg2dec->state == STATE_PICTURE_2ND) ? | ||
817 | STATE_SLICE : STATE_SLICE_1ST); | ||
818 | |||
819 | if (mpeg2dec->decoder.coding_type != D_TYPE) { | ||
820 | prescale (mpeg2dec, 0); | ||
821 | if (decoder->chroma_quantizer[0] == decoder->quantizer_prescale[2]) | ||
822 | prescale (mpeg2dec, 2); | ||
823 | if (mpeg2dec->decoder.coding_type != I_TYPE) { | ||
824 | prescale (mpeg2dec, 1); | ||
825 | if (decoder->chroma_quantizer[1] == decoder->quantizer_prescale[3]) | ||
826 | prescale (mpeg2dec, 3); | ||
827 | } | ||
828 | } | ||
829 | |||
830 | if (!(mpeg2dec->nb_decode_slices)) | ||
831 | mpeg2dec->picture->flags |= PIC_FLAG_SKIP; | ||
832 | else if (mpeg2dec->convert_start) { | ||
833 | mpeg2dec->convert_start (decoder->convert_id, mpeg2dec->fbuf[0], | ||
834 | mpeg2dec->picture, mpeg2dec->info.gop); | ||
835 | |||
836 | if (mpeg2dec->decoder.coding_type == B_TYPE) | ||
837 | mpeg2_init_fbuf (&(mpeg2dec->decoder), mpeg2dec->yuv_buf[2], | ||
838 | mpeg2dec->yuv_buf[mpeg2dec->yuv_index ^ 1], | ||
839 | mpeg2dec->yuv_buf[mpeg2dec->yuv_index]); | ||
840 | else { | ||
841 | mpeg2_init_fbuf (&(mpeg2dec->decoder), | ||
842 | mpeg2dec->yuv_buf[mpeg2dec->yuv_index ^ 1], | ||
843 | mpeg2dec->yuv_buf[mpeg2dec->yuv_index], | ||
844 | mpeg2dec->yuv_buf[mpeg2dec->yuv_index]); | ||
845 | if (mpeg2dec->state == STATE_SLICE) | ||
846 | mpeg2dec->yuv_index ^= 1; | ||
847 | } | ||
848 | } else { | ||
849 | int b_type; | ||
850 | |||
851 | b_type = (mpeg2dec->decoder.coding_type == B_TYPE); | ||
852 | mpeg2_init_fbuf (&(mpeg2dec->decoder), mpeg2dec->fbuf[0]->buf, | ||
853 | mpeg2dec->fbuf[b_type + 1]->buf, | ||
854 | mpeg2dec->fbuf[b_type]->buf); | ||
855 | } | ||
856 | mpeg2dec->action = NULL; | ||
857 | return (mpeg2_state_t)-1; | ||
858 | } | ||
859 | |||
860 | static mpeg2_state_t seek_sequence (mpeg2dec_t * mpeg2dec) | ||
861 | { | ||
862 | mpeg2_reset_info (&(mpeg2dec->info)); | ||
863 | mpeg2dec->info.sequence = NULL; | ||
864 | mpeg2dec->info.gop = NULL; | ||
865 | mpeg2_header_state_init (mpeg2dec); | ||
866 | mpeg2dec->action = mpeg2_seek_header; | ||
867 | return mpeg2_seek_header (mpeg2dec); | ||
868 | } | ||
869 | |||
870 | mpeg2_state_t mpeg2_header_end (mpeg2dec_t * mpeg2dec) | ||
871 | { | ||
872 | mpeg2_picture_t * picture; | ||
873 | int b_type; | ||
874 | |||
875 | b_type = (mpeg2dec->decoder.coding_type == B_TYPE); | ||
876 | picture = mpeg2dec->pictures; | ||
877 | if ((mpeg2dec->picture >= picture + 2) ^ b_type) | ||
878 | picture = mpeg2dec->pictures + 2; | ||
879 | |||
880 | mpeg2_reset_info (&(mpeg2dec->info)); | ||
881 | if (!(mpeg2dec->sequence.flags & SEQ_FLAG_LOW_DELAY)) { | ||
882 | mpeg2dec->info.display_picture = picture; | ||
883 | if (picture->nb_fields == 1) | ||
884 | mpeg2dec->info.display_picture_2nd = picture + 1; | ||
885 | mpeg2dec->info.display_fbuf = mpeg2dec->fbuf[b_type]; | ||
886 | if (!mpeg2dec->convert) | ||
887 | mpeg2dec->info.discard_fbuf = mpeg2dec->fbuf[b_type + 1]; | ||
888 | } else if (!mpeg2dec->convert) | ||
889 | mpeg2dec->info.discard_fbuf = mpeg2dec->fbuf[b_type]; | ||
890 | mpeg2dec->action = seek_sequence; | ||
891 | return STATE_END; | ||
892 | } | ||