2 * Copyright (c) 2003 The FFmpeg Project.
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with this library; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 * How to use this decoder:
20 * SVQ3 data is transported within Apple Quicktime files. Quicktime files
21 * have stsd atoms to describe media trak properties. A stsd atom for a
22 * video trak contains 1 or more ImageDescription atoms. These atoms begin
23 * with the 4-byte length of the atom followed by the codec fourcc. Some
24 * decoders need information in this atom to operate correctly. Such
25 * is the case with SVQ3. In order to get the best use out of this decoder,
26 * the calling app must make the SVQ3 ImageDescription atom available
27 * via the AVCodecContext's extradata[_size] field:
29 * AVCodecContext.extradata = pointer to ImageDescription, first characters
30 * are expected to be 'S', 'V', 'Q', and '3', NOT the 4-byte atom length
31 * AVCodecContext.extradata_size = size of ImageDescription atom memory
32 * buffer (which will be the same as the ImageDescription atom size field
33 * from the QT file, minus 4 bytes since the length is missing)
35 * You will know you have these parameters passed correctly when the decoder
36 * correctly decodes this file:
37 * ftp://ftp.mplayerhq.hu/MPlayer/samples/V-codecs/SVQ3/Vertical400kbit.sorenson3.mov
46 static const uint8_t svq3_scan[16]={
47 0+0*4, 1+0*4, 2+0*4, 2+1*4,
48 2+2*4, 3+0*4, 3+1*4, 3+2*4,
49 0+1*4, 0+2*4, 1+1*4, 1+2*4,
50 0+3*4, 1+3*4, 2+3*4, 3+3*4,
53 static const uint8_t svq3_pred_0[25][2] = {
56 { 0, 2 }, { 1, 1 }, { 2, 0 },
57 { 3, 0 }, { 2, 1 }, { 1, 2 }, { 0, 3 },
58 { 0, 4 }, { 1, 3 }, { 2, 2 }, { 3, 1 }, { 4, 0 },
59 { 4, 1 }, { 3, 2 }, { 2, 3 }, { 1, 4 },
60 { 2, 4 }, { 3, 3 }, { 4, 2 },
65 static const int8_t svq3_pred_1[6][6][5] = {
66 { { 2,-1,-1,-1,-1 }, { 2, 1,-1,-1,-1 }, { 1, 2,-1,-1,-1 },
67 { 2, 1,-1,-1,-1 }, { 1, 2,-1,-1,-1 }, { 1, 2,-1,-1,-1 } },
68 { { 0, 2,-1,-1,-1 }, { 0, 2, 1, 4, 3 }, { 0, 1, 2, 4, 3 },
69 { 0, 2, 1, 4, 3 }, { 2, 0, 1, 3, 4 }, { 0, 4, 2, 1, 3 } },
70 { { 2, 0,-1,-1,-1 }, { 2, 1, 0, 4, 3 }, { 1, 2, 4, 0, 3 },
71 { 2, 1, 0, 4, 3 }, { 2, 1, 4, 3, 0 }, { 1, 2, 4, 0, 3 } },
72 { { 2, 0,-1,-1,-1 }, { 2, 0, 1, 4, 3 }, { 1, 2, 0, 4, 3 },
73 { 2, 1, 0, 4, 3 }, { 2, 1, 3, 4, 0 }, { 2, 4, 1, 0, 3 } },
74 { { 0, 2,-1,-1,-1 }, { 0, 2, 1, 3, 4 }, { 1, 2, 3, 0, 4 },
75 { 2, 0, 1, 3, 4 }, { 2, 1, 3, 0, 4 }, { 2, 0, 4, 3, 1 } },
76 { { 0, 2,-1,-1,-1 }, { 0, 2, 4, 1, 3 }, { 1, 4, 2, 0, 3 },
77 { 4, 2, 0, 1, 3 }, { 2, 0, 1, 4, 3 }, { 4, 2, 1, 0, 3 } },
80 static const struct { uint8_t run; uint8_t level; } svq3_dct_tables[2][16] = {
81 { { 0, 0 }, { 0, 1 }, { 1, 1 }, { 2, 1 }, { 0, 2 }, { 3, 1 }, { 4, 1 }, { 5, 1 },
82 { 0, 3 }, { 1, 2 }, { 2, 2 }, { 6, 1 }, { 7, 1 }, { 8, 1 }, { 9, 1 }, { 0, 4 } },
83 { { 0, 0 }, { 0, 1 }, { 1, 1 }, { 0, 2 }, { 2, 1 }, { 0, 3 }, { 0, 4 }, { 0, 5 },
84 { 3, 1 }, { 4, 1 }, { 1, 2 }, { 1, 3 }, { 0, 6 }, { 0, 7 }, { 0, 8 }, { 0, 9 } }
87 static const uint32_t svq3_dequant_coeff[32] = {
88 3881, 4351, 4890, 5481, 6154, 6914, 7761, 8718,
89 9781, 10987, 12339, 13828, 15523, 17435, 19561, 21873,
90 24552, 27656, 30847, 34870, 38807, 43747, 49103, 54683,
91 61694, 68745, 77615, 89113,100253,109366,126635,141533
95 static void svq3_luma_dc_dequant_idct_c(DCTELEM *block, int qp){
96 const int qmul= svq3_dequant_coeff[qp];
100 static const int x_offset[4]={0, 1*stride, 4* stride, 5*stride};
101 static const int y_offset[4]={0, 2*stride, 8* stride, 10*stride};
104 const int offset= y_offset[i];
105 const int z0= 13*(block[offset+stride*0] + block[offset+stride*4]);
106 const int z1= 13*(block[offset+stride*0] - block[offset+stride*4]);
107 const int z2= 7* block[offset+stride*1] - 17*block[offset+stride*5];
108 const int z3= 17* block[offset+stride*1] + 7*block[offset+stride*5];
117 const int offset= x_offset[i];
118 const int z0= 13*(temp[4*0+i] + temp[4*2+i]);
119 const int z1= 13*(temp[4*0+i] - temp[4*2+i]);
120 const int z2= 7* temp[4*1+i] - 17*temp[4*3+i];
121 const int z3= 17* temp[4*1+i] + 7*temp[4*3+i];
123 block[stride*0 +offset]= ((z0 + z3)*qmul + 0x80000)>>20;
124 block[stride*2 +offset]= ((z1 + z2)*qmul + 0x80000)>>20;
125 block[stride*8 +offset]= ((z1 - z2)*qmul + 0x80000)>>20;
126 block[stride*10+offset]= ((z0 - z3)*qmul + 0x80000)>>20;
131 static void svq3_add_idct_c (uint8_t *dst, DCTELEM *block, int stride, int qp, int dc){
132 const int qmul= svq3_dequant_coeff[qp];
134 uint8_t *cm = cropTbl + MAX_NEG_CROP;
137 dc = 13*13*((dc == 1) ? 1538*block[0] : ((qmul*(block[0] >> 3)) / 2));
141 for (i=0; i < 4; i++) {
142 const int z0= 13*(block[0 + 4*i] + block[2 + 4*i]);
143 const int z1= 13*(block[0 + 4*i] - block[2 + 4*i]);
144 const int z2= 7* block[1 + 4*i] - 17*block[3 + 4*i];
145 const int z3= 17* block[1 + 4*i] + 7*block[3 + 4*i];
147 block[0 + 4*i]= z0 + z3;
148 block[1 + 4*i]= z1 + z2;
149 block[2 + 4*i]= z1 - z2;
150 block[3 + 4*i]= z0 - z3;
153 for (i=0; i < 4; i++) {
154 const int z0= 13*(block[i + 4*0] + block[i + 4*2]);
155 const int z1= 13*(block[i + 4*0] - block[i + 4*2]);
156 const int z2= 7* block[i + 4*1] - 17*block[i + 4*3];
157 const int z3= 17* block[i + 4*1] + 7*block[i + 4*3];
158 const int rr= (dc + 0x80000);
160 dst[i + stride*0]= cm[ dst[i + stride*0] + (((z0 + z3)*qmul + rr) >> 20) ];
161 dst[i + stride*1]= cm[ dst[i + stride*1] + (((z1 + z2)*qmul + rr) >> 20) ];
162 dst[i + stride*2]= cm[ dst[i + stride*2] + (((z1 - z2)*qmul + rr) >> 20) ];
163 dst[i + stride*3]= cm[ dst[i + stride*3] + (((z0 - z3)*qmul + rr) >> 20) ];
167 static void pred4x4_down_left_svq3_c(uint8_t *src, uint8_t *topright, int stride){
170 const __attribute__((unused)) int unu0= t0;
171 const __attribute__((unused)) int unu1= l0;
173 src[0+0*stride]=(l1 + t1)>>1;
175 src[0+1*stride]=(l2 + t2)>>1;
188 src[3+3*stride]=(l3 + t3)>>1;
191 static void pred16x16_plane_svq3_c(uint8_t *src, int stride){
192 pred16x16_plane_compat_c(src, stride, 1);
195 static inline int svq3_decode_block (GetBitContext *gb, DCTELEM *block,
196 int index, const int type) {
198 static const uint8_t *const scan_patterns[4] =
199 { luma_dc_zigzag_scan, zigzag_scan, svq3_scan, chroma_dc_scan };
201 int run, level, sign, vlc, limit;
202 const int intra = (3 * type) >> 2;
203 const uint8_t *const scan = scan_patterns[type];
205 for (limit=(16 >> intra); index < 16; index=limit, limit+=8) {
206 for (; (vlc = svq3_get_ue_golomb (gb)) != 0; index++) {
208 if (vlc == INVALID_VLC)
211 sign = (vlc & 0x1) - 1;
212 vlc = (vlc + 1) >> 1;
218 } else if (vlc < 4) {
223 level = ((vlc + 9) >> 2) - run;
227 run = svq3_dct_tables[intra][vlc].run;
228 level = svq3_dct_tables[intra][vlc].level;
231 level = (vlc >> 3) + ((run == 0) ? 8 : ((run < 2) ? 2 : ((run < 5) ? 0 : -1)));
234 level = (vlc >> 4) + ((run == 0) ? 4 : ((run < 3) ? 2 : ((run < 10) ? 1 : 0)));
238 if ((index += run) >= limit)
241 block[scan[index]] = (level ^ sign) - sign;
252 static void sixpel_mc_put (MpegEncContext *s,
253 uint8_t *src, uint8_t *dst, int stride,
254 int dxy, int width, int height) {
259 for (i=0; i < height; i++) {
260 memcpy (dst, src, width);
266 for (i=0; i < height; i++) {
267 for (j=0; j < width; j++) {
268 dst[j] = (683*(2*src[j] + src[j+1] + 1)) >> 11;
275 for (i=0; i < height; i++) {
276 for (j=0; j < width; j++) {
277 dst[j] = (src[j] + src[j+1] + 1) >> 1;
284 for (i=0; i < height; i++) {
285 for (j=0; j < width; j++) {
286 dst[j] = (683*(src[j] + 2*src[j+1] + 1)) >> 11;
293 for (i=0; i < height; i++) {
294 for (j=0; j < width; j++) {
295 dst[j] = (683*(2*src[j] + src[j+stride] + 1)) >> 11;
302 for (i=0; i < height; i++) {
303 for (j=0; j < width; j++) {
304 dst[j] = (2731*(4*src[j] + 3*src[j+1] + 3*src[j+stride] + 2*src[j+stride+1] + 6)) >> 15;
311 for (i=0; i < height; i++) {
312 for (j=0; j < width; j++) {
313 dst[j] = (2731*(3*src[j] + 4*src[j+1] + 2*src[j+stride] + 3*src[j+stride+1] + 6)) >> 15;
320 for (i=0; i < height; i++) {
321 for (j=0; j < width; j++) {
322 dst[j] = (src[j] + src[j+stride]+1) >> 1;
329 for (i=0; i < height; i++) {
330 for (j=0; j < width; j++) {
331 dst[j] = (src[j] + src[j+1] + src[j+stride] + src[j+stride+1] + 2) >> 2;
338 for (i=0; i < height; i++) {
339 for (j=0; j < width; j++) {
340 dst[j] = (683*(src[j] + 2*src[j+stride] + 1)) >> 11;
347 for (i=0; i < height; i++) {
348 for (j=0; j < width; j++) {
349 dst[j] = (2731*(3*src[j] + 2*src[j+1] + 4*src[j+stride] + 3*src[j+stride+1] + 6)) >> 15;
356 for (i=0; i < height; i++) {
357 for (j=0; j < width; j++) {
358 dst[j] = (2731*(2*src[j] + 3*src[j+1] + 3*src[j+stride] + 4*src[j+stride+1] + 6)) >> 15;
367 static inline void svq3_mc_dir_part (MpegEncContext *s, int x, int y,
368 int width, int height, int mx, int my) {
371 const int sx = ((unsigned) (mx + 0x7FFFFFFE)) % 6;
372 const int sy = ((unsigned) (my + 0x7FFFFFFE)) % 6;
373 const int dxy= 6*sy + sx;
375 /* decode and clip motion vector to frame border (+16) */
376 mx = x + (mx - sx) / 6;
377 my = y + (my - sy) / 6;
379 if (mx < 0 || mx >= (s->width - width - 1) ||
380 my < 0 || my >= (s->height - height - 1)) {
382 if ((s->flags & CODEC_FLAG_EMU_EDGE)) {
386 mx = clip (mx, -16, (s->width - width + 15));
387 my = clip (my, -16, (s->height - height + 15));
390 /* form component predictions */
391 dest = s->current_picture.data[0] + x + y*s->linesize;
392 src = s->last_picture.data[0] + mx + my*s->linesize;
395 ff_emulated_edge_mc (s, src, s->linesize, (width + 1), (height + 1),
396 mx, my, s->width, s->height);
397 src = s->edge_emu_buffer;
399 sixpel_mc_put (s, src, dest, s->linesize, dxy, width, height);
401 if (!(s->flags & CODEC_FLAG_GRAY)) {
402 mx = (mx + (mx < (int) x)) >> 1;
403 my = (my + (my < (int) y)) >> 1;
404 width = (width >> 1);
405 height = (height >> 1);
407 for (i=1; i < 3; i++) {
408 dest = s->current_picture.data[i] + (x >> 1) + (y >> 1)*s->uvlinesize;
409 src = s->last_picture.data[i] + mx + my*s->uvlinesize;
412 ff_emulated_edge_mc (s, src, s->uvlinesize, (width + 1), (height + 1),
413 mx, my, (s->width >> 1), (s->height >> 1));
414 src = s->edge_emu_buffer;
416 sixpel_mc_put (s, src, dest, s->uvlinesize, dxy, width, height);
421 static int svq3_decode_mb (H264Context *h, unsigned int mb_type) {
422 int cbp, dir, mode, mx, my, dx, dy, x, y, part_width, part_height;
426 MpegEncContext *const s = (MpegEncContext *) h;
427 const int mb_xy = s->mb_x + s->mb_y*s->mb_stride;
428 const int b_xy = 4*s->mb_x + 4*s->mb_y*h->b_stride;
430 h->top_samples_available = (s->mb_y == 0) ? 0x33FF : 0xFFFF;
431 h->left_samples_available = (s->mb_x == 0) ? 0x5F5F : 0xFFFF;
432 h->topright_samples_available = 0xFFFF;
434 if (mb_type == 0) { /* SKIP */
435 svq3_mc_dir_part (s, 16*s->mb_x, 16*s->mb_y, 16, 16, 0, 0);
438 mb_type = MB_TYPE_SKIP;
439 } else if (mb_type < 8) { /* INTER */
440 if (h->thirdpel_flag && h->halfpel_flag == !get_bits (&s->gb, 1)) {
441 mode = 3; /* thirdpel */
442 } else if (h->halfpel_flag && h->thirdpel_flag == !get_bits (&s->gb, 1)) {
443 mode = 2; /* halfpel */
445 mode = 1; /* fullpel */
449 memset (h->ref_cache[0], PART_NOT_AVAILABLE, 8*5*sizeof(int8_t));
452 for (i=0; i < 4; i++) {
453 *(uint32_t *) h->mv_cache[0][scan8[0] - 1 + i*8] = *(uint32_t *) s->current_picture.motion_val[0][b_xy - 1 + i*h->b_stride];
454 h->ref_cache[0][scan8[0] - 1 + i*8] = 1;
457 for (i=0; i < 4; i++) {
458 *(uint32_t *) h->mv_cache[0][scan8[0] - 1 + i*8] = 0;
459 h->ref_cache[0][scan8[0] - 1 + i*8] = 1;
463 memcpy (h->mv_cache[0][scan8[0] - 1*8], s->current_picture.motion_val[0][b_xy - h->b_stride], 4*2*sizeof(int16_t));
464 memset (&h->ref_cache[0][scan8[0] - 1*8], 1, 4);
466 if (s->mb_x < (s->mb_width - 1)) {
467 *(uint32_t *) h->mv_cache[0][scan8[0] + 4 - 1*8] = *(uint32_t *) s->current_picture.motion_val[0][b_xy - h->b_stride + 4];
468 h->ref_cache[0][scan8[0] + 4 - 1*8] = 1;
471 *(uint32_t *) h->mv_cache[0][scan8[0] - 1 - 1*8] = *(uint32_t *) s->current_picture.motion_val[0][b_xy - h->b_stride - 1];
472 h->ref_cache[0][scan8[0] - 1 - 1*8] = 1;
476 /* decode motion vector(s) and form prediction(s) */
477 part_width = ((mb_type & 5) == 5) ? 4 : 8 << (mb_type & 1);
478 part_height = 16 >> ((unsigned) mb_type / 3);
480 for (i=0; i < 16; i+=part_height) {
481 for (j=0; j < 16; j+=part_width) {
484 k = ((j>>2)&1) + ((i>>1)&2) + ((j>>1)&4) + (i&8);
486 pred_motion (h, k, (part_width >> 2), 0, 1, &mx, &my);
488 /* clip motion vector prediction to frame border */
489 mx = clip (mx, -6*x, 6*(s->width - part_width - x));
490 my = clip (my, -6*y, 6*(s->height - part_height - y));
492 /* get motion vector differential */
493 dy = svq3_get_se_golomb (&s->gb);
494 dx = svq3_get_se_golomb (&s->gb);
496 if (dx == INVALID_VLC || dy == INVALID_VLC) {
500 /* compute motion vector */
502 mx = ((mx + 1) & ~0x1) + 2*dx;
503 my = ((my + 1) & ~0x1) + 2*dy;
504 } else if (mode == 2) {
505 mx = (mx + 1) - ((unsigned) (0x7FFFFFFF + mx) % 3) + 3*dx;
506 my = (my + 1) - ((unsigned) (0x7FFFFFFF + my) % 3) + 3*dy;
507 } else if (mode == 1) {
508 mx = (mx + 3) - ((unsigned) (0x7FFFFFFB + mx) % 6) + 6*dx;
509 my = (my + 3) - ((unsigned) (0x7FFFFFFB + my) % 6) + 6*dy;
512 /* update mv_cache */
513 for (l=0; l < part_height; l+=4) {
514 for (m=0; m < part_width; m+=4) {
515 k = scan8[0] + ((m + j) >> 2) + ((l + i) << 1);
516 h->mv_cache [0][k][0] = mx;
517 h->mv_cache [0][k][1] = my;
518 h->ref_cache[0][k] = 1;
522 svq3_mc_dir_part (s, x, y, part_width, part_height, mx, my);
526 for (i=0; i < 4; i++) {
527 memcpy (s->current_picture.motion_val[0][b_xy + i*h->b_stride], h->mv_cache[0][scan8[0] + 8*i], 4*2*sizeof(int16_t));
530 if ((vlc = svq3_get_ue_golomb (&s->gb)) >= 48)
533 cbp = golomb_to_inter_cbp[vlc];
534 mb_type = MB_TYPE_16x16;
535 } else if (mb_type == 8) { /* INTRA4x4 */
536 memset (h->intra4x4_pred_mode_cache, -1, 8*5*sizeof(int8_t));
539 for (i=0; i < 4; i++) {
540 h->intra4x4_pred_mode_cache[scan8[0] - 1 + i*8] = h->intra4x4_pred_mode[mb_xy - 1][i];
544 h->intra4x4_pred_mode_cache[4+8*0] = h->intra4x4_pred_mode[mb_xy - s->mb_stride][4];
545 h->intra4x4_pred_mode_cache[5+8*0] = h->intra4x4_pred_mode[mb_xy - s->mb_stride][5];
546 h->intra4x4_pred_mode_cache[6+8*0] = h->intra4x4_pred_mode[mb_xy - s->mb_stride][6];
547 h->intra4x4_pred_mode_cache[7+8*0] = h->intra4x4_pred_mode[mb_xy - s->mb_stride][3];
550 /* decode prediction codes for luma blocks */
551 for (i=0; i < 16; i+=2) {
552 vlc = svq3_get_ue_golomb (&s->gb);
557 left = &h->intra4x4_pred_mode_cache[scan8[i] - 1];
558 top = &h->intra4x4_pred_mode_cache[scan8[i] - 8];
560 left[1] = svq3_pred_1[top[0] + 1][left[0] + 1][svq3_pred_0[vlc][0]];
561 left[2] = svq3_pred_1[top[1] + 1][left[1] + 1][svq3_pred_0[vlc][1]];
563 if (left[1] == -1 || left[2] == -1)
567 write_back_intra_pred_mode (h);
568 check_intra4x4_pred_mode (h);
570 if ((vlc = svq3_get_ue_golomb (&s->gb)) >= 48)
573 cbp = golomb_to_intra4x4_cbp[vlc];
574 mb_type = MB_TYPE_INTRA4x4;
575 } else { /* INTRA16x16 */
576 dir = i_mb_type_info[mb_type - 8].pred_mode;
577 dir = (dir >> 1) ^ 3*(dir & 1) ^ 1;
579 if ((h->intra16x16_pred_mode = check_intra_pred_mode (h, dir)) == -1)
582 cbp = i_mb_type_info[mb_type - 8].cbp;
583 mb_type = MB_TYPE_INTRA16x16;
586 if (!IS_INTER(mb_type) && s->pict_type != I_TYPE) {
587 for (i=0; i < 4; i++) {
588 memset (s->current_picture.motion_val[0][b_xy + i*h->b_stride], 0, 4*2*sizeof(int16_t));
591 if (!IS_INTRA4x4(mb_type)) {
592 memset (h->intra4x4_pred_mode[mb_xy], DC_PRED, 8);
594 if (!IS_SKIP(mb_type)) {
595 memset (h->mb, 0, 24*16*sizeof(DCTELEM));
596 memset (h->non_zero_count_cache, 0, 8*6*sizeof(uint8_t));
599 if (IS_INTRA16x16(mb_type) || (s->pict_type != I_TYPE && s->adaptive_quant && cbp)) {
600 s->qscale += svq3_get_se_golomb (&s->gb);
605 if (IS_INTRA16x16(mb_type)) {
606 if (svq3_decode_block (&s->gb, h->mb, 0, 0))
610 if (!IS_SKIP(mb_type) && cbp) {
611 l = IS_INTRA16x16(mb_type) ? 1 : 0;
612 m = ((s->qscale < 24 && IS_INTRA4x4(mb_type)) ? 2 : 1);
614 for (i=0; i < 4; i++) {
615 if ((cbp & (1 << i))) {
616 for (j=0; j < 4; j++) {
617 k = l ? ((j&1) + 2*(i&1) + 2*(j&2) + 4*(i&2)) : (4*i + j);
618 h->non_zero_count_cache[ scan8[k] ] = 1;
620 if (svq3_decode_block (&s->gb, &h->mb[16*k], l, m))
627 for (i=0; i < 2; ++i) {
628 if (svq3_decode_block (&s->gb, &h->mb[16*(16 + 4*i)], 0, 3))
633 for (i=0; i < 8; i++) {
634 h->non_zero_count_cache[ scan8[16+i] ] = 1;
636 if (svq3_decode_block (&s->gb, &h->mb[16*(16 + i)], 1, 1))
643 s->current_picture.mb_type[mb_xy] = mb_type;
645 if (IS_INTRA(mb_type)) {
646 h->chroma_pred_mode = check_intra_pred_mode (h, DC_PRED8x8);
652 static int svq3_decode_frame (AVCodecContext *avctx,
653 void *data, int *data_size,
654 uint8_t *buf, int buf_size) {
655 MpegEncContext *const s = avctx->priv_data;
656 H264Context *const h = avctx->priv_data;
659 s->flags = avctx->flags;
661 if (!s->context_initialized) {
662 s->width = (avctx->width + 15) & ~15;
663 s->height = (avctx->height + 15) & ~15;
664 h->b_stride = (s->width >> 2);
665 h->pred4x4[DIAG_DOWN_LEFT_PRED] = pred4x4_down_left_svq3_c;
666 h->pred16x16[PLANE_PRED8x8] = pred16x16_plane_svq3_c;
668 h->thirdpel_flag = 1;
671 if (MPV_common_init (s) < 0)
676 if (avctx->extradata && avctx->extradata_size >= 0x63
677 && !memcmp (avctx->extradata, "SVQ3", 4)) {
679 uint8_t *stsd = (uint8_t *) avctx->extradata + 0x62;
681 if ((*stsd >> 5) != 7 || avctx->extradata_size >= 0x66) {
683 if ((*stsd >> 5) == 7) {
684 stsd += 3; /* skip width, height (12 bits each) */
687 h->halfpel_flag = (*stsd >> 4) & 1;
688 h->thirdpel_flag = (*stsd >> 3) & 1;
692 if ((buf[0] & 0x9F) != 1) {
694 fprintf (stderr, "unsupported header (%02X)\n", buf[0]);
697 int length = (buf[0] >> 5) & 3;
700 for (i=0; i < length; i++) {
701 offset = (offset << 8) | buf[i + 1];
704 if (buf_size < (offset + length + 1) || length == 0)
707 memcpy (&buf[2], &buf[offset + 2], (length - 1));
710 init_get_bits (&s->gb, &buf[2], 8*(buf_size - 2));
712 if ((i = svq3_get_ue_golomb (&s->gb)) == INVALID_VLC || i >= 3)
715 s->pict_type = golomb_to_pict_type[i];
718 get_bits (&s->gb, 1);
719 get_bits (&s->gb, 8);
721 s->qscale = get_bits (&s->gb, 5);
722 s->adaptive_quant = get_bits (&s->gb, 1);
725 get_bits (&s->gb, 1);
726 get_bits (&s->gb, 1);
727 get_bits (&s->gb, 2);
729 while (get_bits (&s->gb, 1)) {
730 get_bits (&s->gb, 8);
733 if(avctx->debug&FF_DEBUG_PICT_INFO){
734 printf("%c hpel:%d, tpel:%d aqp:%d qp:%d\n",
735 ff_get_pict_type_char(s->pict_type), h->halfpel_flag, h->thirdpel_flag,
736 s->adaptive_quant, s->qscale
740 /* B-frames are not supported */
741 if (s->pict_type == B_TYPE/* && avctx->hurry_up*/)
746 for (s->mb_y=0; s->mb_y < s->mb_height; s->mb_y++) {
747 for (s->mb_x=0; s->mb_x < s->mb_width; s->mb_x++) {
748 int mb_type = svq3_get_ue_golomb (&s->gb);
750 if (s->pict_type == I_TYPE) {
753 if (mb_type > 32 || svq3_decode_mb (h, mb_type)) {
754 fprintf (stderr, "error while decoding MB %d %d\n", s->mb_x, s->mb_y);
764 *(AVFrame *) data = *(AVFrame *) &s->current_picture;
765 *data_size = sizeof(AVFrame);
773 AVCodec svq3_decoder = {