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FFmpeg/libavcodec/svq3.c

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  1. /*

  2.  * Copyright (c) 2003 The FFmpeg Project

  3.  *

  4.  * This file is part of FFmpeg.

  5.  *

  6.  * FFmpeg is free software; you can redistribute it and/or

  7.  * modify it under the terms of the GNU Lesser General Public

  8.  * License as published by the Free Software Foundation; either

  9.  * version 2.1 of the License, or (at your option) any later version.

  10.  *

  11.  * FFmpeg is distributed in the hope that it will be useful,

  12.  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  13.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

  14.  * Lesser General Public License for more details.

  15.  *

  16.  * You should have received a copy of the GNU Lesser General Public

  17.  * License along with FFmpeg; if not, write to the Free Software

  18.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  19.  */

  20. 

  21. /*

  22.  * How to use this decoder:

  23.  * SVQ3 data is transported within Apple Quicktime files. Quicktime files

  24.  * have stsd atoms to describe media trak properties. A stsd atom for a

  25.  * video trak contains 1 or more ImageDescription atoms. These atoms begin

  26.  * with the 4-byte length of the atom followed by the codec fourcc. Some

  27.  * decoders need information in this atom to operate correctly. Such

  28.  * is the case with SVQ3. In order to get the best use out of this decoder,

  29.  * the calling app must make the SVQ3 ImageDescription atom available

  30.  * via the AVCodecContext's extradata[_size] field:

  31.  *

  32.  * AVCodecContext.extradata = pointer to ImageDescription, first characters

  33.  * are expected to be 'S', 'V', 'Q', and '3', NOT the 4-byte atom length

  34.  * AVCodecContext.extradata_size = size of ImageDescription atom memory

  35.  * buffer (which will be the same as the ImageDescription atom size field

  36.  * from the QT file, minus 4 bytes since the length is missing)

  37.  *

  38.  * You will know you have these parameters passed correctly when the decoder

  39.  * correctly decodes this file:

  40.  *  http://samples.mplayerhq.hu/V-codecs/SVQ3/Vertical400kbit.sorenson3.mov

  41.  */

  42. #include "internal.h"

  43. #include "dsputil.h"

  44. #include "avcodec.h"

  45. #include "mpegvideo.h"

  46. #include "h264.h"

  47. 

  48. #include "h264data.h" //FIXME FIXME FIXME

  49. 

  50. #include "h264_mvpred.h"

  51. #include "golomb.h"

  52. #include "rectangle.h"

  53. #include "vdpau_internal.h"

  54. 

  55. #if CONFIG_ZLIB

  56. #include <zlib.h>

  57. #endif

  58. 

  59. #include "svq1.h"

  60. 

  61. /**

  62.  * @file

  63.  * svq3 decoder.

  64.  */

  65. 

  66. typedef struct {

  67.     H264Context h;

  68.     int halfpel_flag;

  69.     int thirdpel_flag;

  70.     int unknown_flag;

  71.     int next_slice_index;

  72.     uint32_t watermark_key;

  73.     uint8_t *buf;

  74.     int buf_size;

  75. } SVQ3Context;

  76. 

  77. #define FULLPEL_MODE  1

  78. #define HALFPEL_MODE  2

  79. #define THIRDPEL_MODE 3

  80. #define PREDICT_MODE  4

  81. 

  82. /* dual scan (from some older h264 draft)

  83.  o-->o-->o   o

  84.          |  /|

  85.  o   o   o / o

  86.  | / |   |/  |

  87.  o   o   o   o

  88.    /

  89.  o-->o-->o-->o

  90. */

  91. static const uint8_t svq3_scan[16] = {

  92.     0+0*4, 1+0*4, 2+0*4, 2+1*4,

  93.     2+2*4, 3+0*4, 3+1*4, 3+2*4,

  94.     0+1*4, 0+2*4, 1+1*4, 1+2*4,

  95.     0+3*4, 1+3*4, 2+3*4, 3+3*4,

  96. };

  97. 

  98. static const uint8_t svq3_pred_0[25][2] = {

  99.     { 0, 0 },

  100.     { 1, 0 }, { 0, 1 },

  101.     { 0, 2 }, { 1, 1 }, { 2, 0 },

  102.     { 3, 0 }, { 2, 1 }, { 1, 2 }, { 0, 3 },

  103.     { 0, 4 }, { 1, 3 }, { 2, 2 }, { 3, 1 }, { 4, 0 },

  104.     { 4, 1 }, { 3, 2 }, { 2, 3 }, { 1, 4 },

  105.     { 2, 4 }, { 3, 3 }, { 4, 2 },

  106.     { 4, 3 }, { 3, 4 },

  107.     { 4, 4 }

  108. };

  109. 

  110. static const int8_t svq3_pred_1[6][6][5] = {

  111.     { { 2,-1,-1,-1,-1 }, { 2, 1,-1,-1,-1 }, { 1, 2,-1,-1,-1 },

  112.       { 2, 1,-1,-1,-1 }, { 1, 2,-1,-1,-1 }, { 1, 2,-1,-1,-1 } },

  113.     { { 0, 2,-1,-1,-1 }, { 0, 2, 1, 4, 3 }, { 0, 1, 2, 4, 3 },

  114.       { 0, 2, 1, 4, 3 }, { 2, 0, 1, 3, 4 }, { 0, 4, 2, 1, 3 } },

  115.     { { 2, 0,-1,-1,-1 }, { 2, 1, 0, 4, 3 }, { 1, 2, 4, 0, 3 },

  116.       { 2, 1, 0, 4, 3 }, { 2, 1, 4, 3, 0 }, { 1, 2, 4, 0, 3 } },

  117.     { { 2, 0,-1,-1,-1 }, { 2, 0, 1, 4, 3 }, { 1, 2, 0, 4, 3 },

  118.       { 2, 1, 0, 4, 3 }, { 2, 1, 3, 4, 0 }, { 2, 4, 1, 0, 3 } },

  119.     { { 0, 2,-1,-1,-1 }, { 0, 2, 1, 3, 4 }, { 1, 2, 3, 0, 4 },

  120.       { 2, 0, 1, 3, 4 }, { 2, 1, 3, 0, 4 }, { 2, 0, 4, 3, 1 } },

  121.     { { 0, 2,-1,-1,-1 }, { 0, 2, 4, 1, 3 }, { 1, 4, 2, 0, 3 },

  122.       { 4, 2, 0, 1, 3 }, { 2, 0, 1, 4, 3 }, { 4, 2, 1, 0, 3 } },

  123. };

  124. 

  125. static const struct { uint8_t run; uint8_t level; } svq3_dct_tables[2][16] = {

  126.     { { 0, 0 }, { 0, 1 }, { 1, 1 }, { 2, 1 }, { 0, 2 }, { 3, 1 }, { 4, 1 }, { 5, 1 },

  127.       { 0, 3 }, { 1, 2 }, { 2, 2 }, { 6, 1 }, { 7, 1 }, { 8, 1 }, { 9, 1 }, { 0, 4 } },

  128.     { { 0, 0 }, { 0, 1 }, { 1, 1 }, { 0, 2 }, { 2, 1 }, { 0, 3 }, { 0, 4 }, { 0, 5 },

  129.       { 3, 1 }, { 4, 1 }, { 1, 2 }, { 1, 3 }, { 0, 6 }, { 0, 7 }, { 0, 8 }, { 0, 9 } }

  130. };

  131. 

  132. static const uint32_t svq3_dequant_coeff[32] = {

  133.      3881,  4351,  4890,  5481,  6154,  6914,  7761,  8718,

  134.      9781, 10987, 12339, 13828, 15523, 17435, 19561, 21873,

  135.     24552, 27656, 30847, 34870, 38807, 43747, 49103, 54683,

  136.     61694, 68745, 77615, 89113,100253,109366,126635,141533

  137. };

  138. 

  139. void ff_svq3_luma_dc_dequant_idct_c(DCTELEM *output, DCTELEM *input, int qp){

  140.     const int qmul = svq3_dequant_coeff[qp];

  141. #define stride 16

  142.     int i;

  143.     int temp[16];

  144.     static const uint8_t x_offset[4]={0, 1*stride, 4*stride, 5*stride};

  145. 

  146.     for(i=0; i<4; i++){

  147.         const int z0 = 13*(input[4*i+0] +    input[4*i+2]);

  148.         const int z1 = 13*(input[4*i+0] -    input[4*i+2]);

  149.         const int z2 =  7* input[4*i+1] - 17*input[4*i+3];

  150.         const int z3 = 17* input[4*i+1] +  7*input[4*i+3];

  151. 

  152.         temp[4*i+0] = z0+z3;

  153.         temp[4*i+1] = z1+z2;

  154.         temp[4*i+2] = z1-z2;

  155.         temp[4*i+3] = z0-z3;

  156.     }

  157. 

  158.     for(i=0; i<4; i++){

  159.         const int offset= x_offset[i];

  160.         const int z0= 13*(temp[4*0+i] +    temp[4*2+i]);

  161.         const int z1= 13*(temp[4*0+i] -    temp[4*2+i]);

  162.         const int z2=  7* temp[4*1+i] - 17*temp[4*3+i];

  163.         const int z3= 17* temp[4*1+i] +  7*temp[4*3+i];

  164. 

  165.         output[stride* 0+offset] = ((z0 + z3)*qmul + 0x80000) >> 20;

  166.         output[stride* 2+offset] = ((z1 + z2)*qmul + 0x80000) >> 20;

  167.         output[stride* 8+offset] = ((z1 - z2)*qmul + 0x80000) >> 20;

  168.         output[stride*10+offset] = ((z0 - z3)*qmul + 0x80000) >> 20;

  169.     }

  170. }

  171. #undef stride

  172. 

  173. void ff_svq3_add_idct_c(uint8_t *dst, DCTELEM *block, int stride, int qp,

  174.                             int dc)

  175. {

  176.     const int qmul = svq3_dequant_coeff[qp];

  177.     int i;

  178. 

  179.     if (dc) {

  180.         dc = 13*13*((dc == 1) ? 1538*block[0] : ((qmul*(block[0] >> 3)) / 2));

  181.         block[0] = 0;

  182.     }

  183. 

  184.     for (i = 0; i < 4; i++) {

  185.         const int z0 = 13*(block[0 + 4*i] +    block[2 + 4*i]);

  186.         const int z1 = 13*(block[0 + 4*i] -    block[2 + 4*i]);

  187.         const int z2 =  7* block[1 + 4*i] - 17*block[3 + 4*i];

  188.         const int z3 = 17* block[1 + 4*i] +  7*block[3 + 4*i];

  189. 

  190.         block[0 + 4*i] = z0 + z3;

  191.         block[1 + 4*i] = z1 + z2;

  192.         block[2 + 4*i] = z1 - z2;

  193.         block[3 + 4*i] = z0 - z3;

  194.     }

  195. 

  196.     for (i = 0; i < 4; i++) {

  197.         const int z0 = 13*(block[i + 4*0] +    block[i + 4*2]);

  198.         const int z1 = 13*(block[i + 4*0] -    block[i + 4*2]);

  199.         const int z2 =  7* block[i + 4*1] - 17*block[i + 4*3];

  200.         const int z3 = 17* block[i + 4*1] +  7*block[i + 4*3];

  201.         const int rr = (dc + 0x80000);

  202. 

  203.         dst[i + stride*0] = av_clip_uint8( dst[i + stride*0] + (((z0 + z3)*qmul + rr) >> 20) );

  204.         dst[i + stride*1] = av_clip_uint8( dst[i + stride*1] + (((z1 + z2)*qmul + rr) >> 20) );

  205.         dst[i + stride*2] = av_clip_uint8( dst[i + stride*2] + (((z1 - z2)*qmul + rr) >> 20) );

  206.         dst[i + stride*3] = av_clip_uint8( dst[i + stride*3] + (((z0 - z3)*qmul + rr) >> 20) );

  207.     }

  208. }

  209. 

  210. static inline int svq3_decode_block(GetBitContext *gb, DCTELEM *block,

  211.                                     int index, const int type)

  212. {

  213.     static const uint8_t *const scan_patterns[4] =

  214.     { luma_dc_zigzag_scan, zigzag_scan, svq3_scan, chroma_dc_scan };

  215. 

  216.     int run, level, sign, vlc, limit;

  217.     const int intra = (3 * type) >> 2;

  218.     const uint8_t *const scan = scan_patterns[type];

  219. 

  220.     for (limit = (16 >> intra); index < 16; index = limit, limit += 8) {

  221.         for (; (vlc = svq3_get_ue_golomb(gb)) != 0; index++) {

  222. 

  223.           if (vlc < 0)

  224.               return -1;

  225. 

  226.           sign = (vlc & 0x1) - 1;

  227.           vlc  = (vlc + 1) >> 1;

  228. 

  229.           if (type == 3) {

  230.               if (vlc < 3) {

  231.                   run   = 0;

  232.                   level = vlc;

  233.               } else if (vlc < 4) {

  234.                   run   = 1;

  235.                   level = 1;

  236.               } else {

  237.                   run   = (vlc & 0x3);

  238.                   level = ((vlc + 9) >> 2) - run;

  239.               }

  240.           } else {

  241.               if (vlc < 16U) {

  242.                   run   = svq3_dct_tables[intra][vlc].run;

  243.                   level = svq3_dct_tables[intra][vlc].level;

  244.               } else if (intra) {

  245.                   run   = (vlc & 0x7);

  246.                   level = (vlc >> 3) + ((run == 0) ? 8 : ((run < 2) ? 2 : ((run < 5) ? 0 : -1)));

  247.               } else {

  248.                   run   = (vlc & 0xF);

  249.                   level = (vlc >> 4) + ((run == 0) ? 4 : ((run < 3) ? 2 : ((run < 10) ? 1 : 0)));

  250.               }

  251.           }

  252. 

  253.           if ((index += run) >= limit)

  254.               return -1;

  255. 

  256.           block[scan[index]] = (level ^ sign) - sign;

  257.         }

  258. 

  259.         if (type != 2) {

  260.             break;

  261.         }

  262.     }

  263. 

  264.     return 0;

  265. }

  266. 

  267. static inline void svq3_mc_dir_part(MpegEncContext *s,

  268.                                     int x, int y, int width, int height,

  269.                                     int mx, int my, int dxy,

  270.                                     int thirdpel, int dir, int avg)

  271. {

  272.     const Picture *pic = (dir == 0) ? &s->last_picture : &s->next_picture;

  273.     uint8_t *src, *dest;

  274.     int i, emu = 0;

  275.     int blocksize = 2 - (width>>3); //16->0, 8->1, 4->2

  276. 

  277.     mx += x;

  278.     my += y;

  279. 

  280.     if (mx < 0 || mx >= (s->h_edge_pos - width  - 1) ||

  281.         my < 0 || my >= (s->v_edge_pos - height - 1)) {

  282. 

  283.         if ((s->flags & CODEC_FLAG_EMU_EDGE)) {

  284.             emu = 1;

  285.         }

  286. 

  287.         mx = av_clip (mx, -16, (s->h_edge_pos - width  + 15));

  288.         my = av_clip (my, -16, (s->v_edge_pos - height + 15));

  289.     }

  290. 

  291.     /* form component predictions */

  292.     dest = s->current_picture.f.data[0] + x + y*s->linesize;

  293.     src  = pic->f.data[0] + mx + my*s->linesize;

  294. 

  295.     if (emu) {

  296.         s->dsp.emulated_edge_mc(s->edge_emu_buffer, src, s->linesize, (width + 1), (height + 1),

  297.                             mx, my, s->h_edge_pos, s->v_edge_pos);

  298.         src = s->edge_emu_buffer;

  299.     }

  300.     if (thirdpel)

  301.         (avg ? s->dsp.avg_tpel_pixels_tab : s->dsp.put_tpel_pixels_tab)[dxy](dest, src, s->linesize, width, height);

  302.     else

  303.         (avg ? s->dsp.avg_pixels_tab : s->dsp.put_pixels_tab)[blocksize][dxy](dest, src, s->linesize, height);

  304. 

  305.     if (!(s->flags & CODEC_FLAG_GRAY)) {

  306.         mx     = (mx + (mx < (int) x)) >> 1;

  307.         my     = (my + (my < (int) y)) >> 1;

  308.         width  = (width  >> 1);

  309.         height = (height >> 1);

  310.         blocksize++;

  311. 

  312.         for (i = 1; i < 3; i++) {

  313.             dest = s->current_picture.f.data[i] + (x >> 1) + (y >> 1) * s->uvlinesize;

  314.             src  = pic->f.data[i] + mx + my * s->uvlinesize;

  315. 

  316.             if (emu) {

  317.                 s->dsp.emulated_edge_mc(s->edge_emu_buffer, src, s->uvlinesize, (width + 1), (height + 1),

  318.                                     mx, my, (s->h_edge_pos >> 1), (s->v_edge_pos >> 1));

  319.                 src = s->edge_emu_buffer;

  320.             }

  321.             if (thirdpel)

  322.                 (avg ? s->dsp.avg_tpel_pixels_tab : s->dsp.put_tpel_pixels_tab)[dxy](dest, src, s->uvlinesize, width, height);

  323.             else

  324.                 (avg ? s->dsp.avg_pixels_tab : s->dsp.put_pixels_tab)[blocksize][dxy](dest, src, s->uvlinesize, height);

  325.         }

  326.     }

  327. }

  328. 

  329. static inline int svq3_mc_dir(H264Context *h, int size, int mode, int dir,

  330.                               int avg)

  331. {

  332.     int i, j, k, mx, my, dx, dy, x, y;

  333.     MpegEncContext *const s = (MpegEncContext *) h;

  334.     const int part_width  = ((size & 5) == 4) ? 4 : 16 >> (size & 1);

  335.     const int part_height = 16 >> ((unsigned) (size + 1) / 3);

  336.     const int extra_width = (mode == PREDICT_MODE) ? -16*6 : 0;

  337.     const int h_edge_pos  = 6*(s->h_edge_pos - part_width ) - extra_width;

  338.     const int v_edge_pos  = 6*(s->v_edge_pos - part_height) - extra_width;

  339. 

  340.     for (i = 0; i < 16; i += part_height) {

  341.         for (j = 0; j < 16; j += part_width) {

  342.             const int b_xy = (4*s->mb_x + (j >> 2)) + (4*s->mb_y + (i >> 2))*h->b_stride;

  343.             int dxy;

  344.             x = 16*s->mb_x + j;

  345.             y = 16*s->mb_y + i;

  346.             k = ((j >> 2) & 1) + ((i >> 1) & 2) + ((j >> 1) & 4) + (i & 8);

  347. 

  348.             if (mode != PREDICT_MODE) {

  349.                 pred_motion(h, k, (part_width >> 2), dir, 1, &mx, &my);

  350.             } else {

  351.                 mx = s->next_picture.f.motion_val[0][b_xy][0] << 1;

  352.                 my = s->next_picture.f.motion_val[0][b_xy][1] << 1;

  353. 

  354.                 if (dir == 0) {

  355.                     mx = ((mx * h->frame_num_offset) / h->prev_frame_num_offset + 1) >> 1;

  356.                     my = ((my * h->frame_num_offset) / h->prev_frame_num_offset + 1) >> 1;

  357.                 } else {

  358.                     mx = ((mx * (h->frame_num_offset - h->prev_frame_num_offset)) / h->prev_frame_num_offset + 1) >> 1;

  359.                     my = ((my * (h->frame_num_offset - h->prev_frame_num_offset)) / h->prev_frame_num_offset + 1) >> 1;

  360.                 }

  361.             }

  362. 

  363.             /* clip motion vector prediction to frame border */

  364.             mx = av_clip(mx, extra_width - 6*x, h_edge_pos - 6*x);

  365.             my = av_clip(my, extra_width - 6*y, v_edge_pos - 6*y);

  366. 

  367.             /* get (optional) motion vector differential */

  368.             if (mode == PREDICT_MODE) {

  369.                 dx = dy = 0;

  370.             } else {

  371.                 dy = svq3_get_se_golomb(&s->gb);

  372.                 dx = svq3_get_se_golomb(&s->gb);

  373. 

  374.                 if (dx == INVALID_VLC || dy == INVALID_VLC) {

  375.                     av_log(h->s.avctx, AV_LOG_ERROR, "invalid MV vlc\n");

  376.                     return -1;

  377.                 }

  378.             }

  379. 

  380.             /* compute motion vector */

  381.             if (mode == THIRDPEL_MODE) {

  382.                 int fx, fy;

  383.                 mx  = ((mx + 1)>>1) + dx;

  384.                 my  = ((my + 1)>>1) + dy;

  385.                 fx  = ((unsigned)(mx + 0x3000))/3 - 0x1000;

  386.                 fy  = ((unsigned)(my + 0x3000))/3 - 0x1000;

  387.                 dxy = (mx - 3*fx) + 4*(my - 3*fy);

  388. 

  389.                 svq3_mc_dir_part(s, x, y, part_width, part_height, fx, fy, dxy, 1, dir, avg);

  390.                 mx += mx;

  391.                 my += my;

  392.             } else if (mode == HALFPEL_MODE || mode == PREDICT_MODE) {

  393.                 mx  = ((unsigned)(mx + 1 + 0x3000))/3 + dx - 0x1000;

  394.                 my  = ((unsigned)(my + 1 + 0x3000))/3 + dy - 0x1000;

  395.                 dxy = (mx&1) + 2*(my&1);

  396. 

  397.                 svq3_mc_dir_part(s, x, y, part_width, part_height, mx>>1, my>>1, dxy, 0, dir, avg);

  398.                 mx *= 3;

  399.                 my *= 3;

  400.             } else {

  401.                 mx = ((unsigned)(mx + 3 + 0x6000))/6 + dx - 0x1000;

  402.                 my = ((unsigned)(my + 3 + 0x6000))/6 + dy - 0x1000;

  403. 

  404.                 svq3_mc_dir_part(s, x, y, part_width, part_height, mx, my, 0, 0, dir, avg);

  405.                 mx *= 6;

  406.                 my *= 6;

  407.             }

  408. 

  409.             /* update mv_cache */

  410.             if (mode != PREDICT_MODE) {

  411.                 int32_t mv = pack16to32(mx,my);

  412. 

  413.                 if (part_height == 8 && i < 8) {

  414.                     *(int32_t *) h->mv_cache[dir][scan8[k] + 1*8] = mv;

  415. 

  416.                     if (part_width == 8 && j < 8) {

  417.                         *(int32_t *) h->mv_cache[dir][scan8[k] + 1 + 1*8] = mv;

  418.                     }

  419.                 }

  420.                 if (part_width == 8 && j < 8) {

  421.                     *(int32_t *) h->mv_cache[dir][scan8[k] + 1] = mv;

  422.                 }

  423.                 if (part_width == 4 || part_height == 4) {

  424.                     *(int32_t *) h->mv_cache[dir][scan8[k]] = mv;

  425.                 }

  426.             }

  427. 

  428.             /* write back motion vectors */

  429.             fill_rectangle(s->current_picture.f.motion_val[dir][b_xy],

  430.                            part_width >> 2, part_height >> 2, h->b_stride,

  431.                            pack16to32(mx, my), 4);

  432.         }

  433.     }

  434. 

  435.     return 0;

  436. }

  437. 

  438. static int svq3_decode_mb(SVQ3Context *svq3, unsigned int mb_type)

  439. {

  440.     H264Context *h = &svq3->h;

  441.     int i, j, k, m, dir, mode;

  442.     int cbp = 0;

  443.     uint32_t vlc;

  444.     int8_t *top, *left;

  445.     MpegEncContext *const s = (MpegEncContext *) h;

  446.     const int mb_xy = h->mb_xy;

  447.     const int b_xy  = 4*s->mb_x + 4*s->mb_y*h->b_stride;

  448. 

  449.     h->top_samples_available      = (s->mb_y == 0) ? 0x33FF : 0xFFFF;

  450.     h->left_samples_available     = (s->mb_x == 0) ? 0x5F5F : 0xFFFF;

  451.     h->topright_samples_available = 0xFFFF;

  452. 

  453.     if (mb_type == 0) {           /* SKIP */

  454.         if (s->pict_type == AV_PICTURE_TYPE_P || s->next_picture.f.mb_type[mb_xy] == -1) {

  455.             svq3_mc_dir_part(s, 16*s->mb_x, 16*s->mb_y, 16, 16, 0, 0, 0, 0, 0, 0);

  456. 

  457.             if (s->pict_type == AV_PICTURE_TYPE_B) {

  458.                 svq3_mc_dir_part(s, 16*s->mb_x, 16*s->mb_y, 16, 16, 0, 0, 0, 0, 1, 1);

  459.             }

  460. 

  461.             mb_type = MB_TYPE_SKIP;

  462.         } else {

  463.             mb_type = FFMIN(s->next_picture.f.mb_type[mb_xy], 6);

  464.             if (svq3_mc_dir(h, mb_type, PREDICT_MODE, 0, 0) < 0)

  465.                 return -1;

  466.             if (svq3_mc_dir(h, mb_type, PREDICT_MODE, 1, 1) < 0)

  467.                 return -1;

  468. 

  469.             mb_type = MB_TYPE_16x16;

  470.         }

  471.     } else if (mb_type < 8) {     /* INTER */

  472.         if (svq3->thirdpel_flag && svq3->halfpel_flag == !get_bits1 (&s->gb)) {

  473.             mode = THIRDPEL_MODE;

  474.         } else if (svq3->halfpel_flag && svq3->thirdpel_flag == !get_bits1 (&s->gb)) {

  475.             mode = HALFPEL_MODE;

  476.         } else {

  477.             mode = FULLPEL_MODE;

  478.         }

  479. 

  480.         /* fill caches */

  481.         /* note ref_cache should contain here:

  482.             ????????

  483.             ???11111

  484.             N??11111

  485.             N??11111

  486.             N??11111

  487.         */

  488. 

  489.         for (m = 0; m < 2; m++) {

  490.             if (s->mb_x > 0 && h->intra4x4_pred_mode[h->mb2br_xy[mb_xy - 1]+6] != -1) {

  491.                 for (i = 0; i < 4; i++) {

  492.                     *(uint32_t *) h->mv_cache[m][scan8[0] - 1 + i*8] = *(uint32_t *) s->current_picture.f.motion_val[m][b_xy - 1 + i*h->b_stride];

  493.                 }

  494.             } else {

  495.                 for (i = 0; i < 4; i++) {

  496.                     *(uint32_t *) h->mv_cache[m][scan8[0] - 1 + i*8] = 0;

  497.                 }

  498.             }

  499.             if (s->mb_y > 0) {

  500.                 memcpy(h->mv_cache[m][scan8[0] - 1*8], s->current_picture.f.motion_val[m][b_xy - h->b_stride], 4*2*sizeof(int16_t));

  501.                 memset(&h->ref_cache[m][scan8[0] - 1*8], (h->intra4x4_pred_mode[h->mb2br_xy[mb_xy - s->mb_stride]] == -1) ? PART_NOT_AVAILABLE : 1, 4);

  502. 

  503.                 if (s->mb_x < (s->mb_width - 1)) {

  504.                     *(uint32_t *) h->mv_cache[m][scan8[0] + 4 - 1*8] = *(uint32_t *) s->current_picture.f.motion_val[m][b_xy - h->b_stride + 4];

  505.                     h->ref_cache[m][scan8[0] + 4 - 1*8] =

  506.                         (h->intra4x4_pred_mode[h->mb2br_xy[mb_xy - s->mb_stride + 1]+6] == -1 ||

  507.                          h->intra4x4_pred_mode[h->mb2br_xy[mb_xy - s->mb_stride    ]  ] == -1) ? PART_NOT_AVAILABLE : 1;

  508.                 }else

  509.                     h->ref_cache[m][scan8[0] + 4 - 1*8] = PART_NOT_AVAILABLE;

  510.                 if (s->mb_x > 0) {

  511.                     *(uint32_t *) h->mv_cache[m][scan8[0] - 1 - 1*8] = *(uint32_t *) s->current_picture.f.motion_val[m][b_xy - h->b_stride - 1];

  512.                     h->ref_cache[m][scan8[0] - 1 - 1*8] = (h->intra4x4_pred_mode[h->mb2br_xy[mb_xy - s->mb_stride - 1]+3] == -1) ? PART_NOT_AVAILABLE : 1;

  513.                 }else

  514.                     h->ref_cache[m][scan8[0] - 1 - 1*8] = PART_NOT_AVAILABLE;

  515.             }else

  516.                 memset(&h->ref_cache[m][scan8[0] - 1*8 - 1], PART_NOT_AVAILABLE, 8);

  517. 

  518.             if (s->pict_type != AV_PICTURE_TYPE_B)

  519.                 break;

  520.         }

  521. 

  522.         /* decode motion vector(s) and form prediction(s) */

  523.         if (s->pict_type == AV_PICTURE_TYPE_P) {

  524.             if (svq3_mc_dir(h, (mb_type - 1), mode, 0, 0) < 0)

  525.                 return -1;

  526.         } else {        /* AV_PICTURE_TYPE_B */

  527.             if (mb_type != 2) {

  528.                 if (svq3_mc_dir(h, 0, mode, 0, 0) < 0)

  529.                     return -1;

  530.             } else {

  531.                 for (i = 0; i < 4; i++) {

  532.                     memset(s->current_picture.f.motion_val[0][b_xy + i*h->b_stride], 0, 4*2*sizeof(int16_t));

  533.                 }

  534.             }

  535.             if (mb_type != 1) {

  536.                 if (svq3_mc_dir(h, 0, mode, 1, (mb_type == 3)) < 0)

  537.                     return -1;

  538.             } else {

  539.                 for (i = 0; i < 4; i++) {

  540.                     memset(s->current_picture.f.motion_val[1][b_xy + i*h->b_stride], 0, 4*2*sizeof(int16_t));

  541.                 }

  542.             }

  543.         }

  544. 

  545.         mb_type = MB_TYPE_16x16;

  546.     } else if (mb_type == 8 || mb_type == 33) {   /* INTRA4x4 */

  547.         memset(h->intra4x4_pred_mode_cache, -1, 8*5*sizeof(int8_t));

  548. 

  549.         if (mb_type == 8) {

  550.             if (s->mb_x > 0) {

  551.                 for (i = 0; i < 4; i++) {

  552.                     h->intra4x4_pred_mode_cache[scan8[0] - 1 + i*8] = h->intra4x4_pred_mode[h->mb2br_xy[mb_xy - 1]+6-i];

  553.                 }

  554.                 if (h->intra4x4_pred_mode_cache[scan8[0] - 1] == -1) {

  555.                     h->left_samples_available = 0x5F5F;

  556.                 }

  557.             }

  558.             if (s->mb_y > 0) {

  559.                 h->intra4x4_pred_mode_cache[4+8*0] = h->intra4x4_pred_mode[h->mb2br_xy[mb_xy - s->mb_stride]+0];

  560.                 h->intra4x4_pred_mode_cache[5+8*0] = h->intra4x4_pred_mode[h->mb2br_xy[mb_xy - s->mb_stride]+1];

  561.                 h->intra4x4_pred_mode_cache[6+8*0] = h->intra4x4_pred_mode[h->mb2br_xy[mb_xy - s->mb_stride]+2];

  562.                 h->intra4x4_pred_mode_cache[7+8*0] = h->intra4x4_pred_mode[h->mb2br_xy[mb_xy - s->mb_stride]+3];

  563. 

  564.                 if (h->intra4x4_pred_mode_cache[4+8*0] == -1) {

  565.                     h->top_samples_available = 0x33FF;

  566.                 }

  567.             }

  568. 

  569.             /* decode prediction codes for luma blocks */

  570.             for (i = 0; i < 16; i+=2) {

  571.                 vlc = svq3_get_ue_golomb(&s->gb);

  572. 

  573.                 if (vlc >= 25U){

  574.                     av_log(h->s.avctx, AV_LOG_ERROR, "luma prediction:%d\n", vlc);

  575.                     return -1;

  576.                 }

  577. 

  578.                 left    = &h->intra4x4_pred_mode_cache[scan8[i] - 1];

  579.                 top     = &h->intra4x4_pred_mode_cache[scan8[i] - 8];

  580. 

  581.                 left[1] = svq3_pred_1[top[0] + 1][left[0] + 1][svq3_pred_0[vlc][0]];

  582.                 left[2] = svq3_pred_1[top[1] + 1][left[1] + 1][svq3_pred_0[vlc][1]];

  583. 

  584.                 if (left[1] == -1 || left[2] == -1){

  585.                     av_log(h->s.avctx, AV_LOG_ERROR, "weird prediction\n");

  586.                     return -1;

  587.                 }

  588.             }

  589.         } else {    /* mb_type == 33, DC_128_PRED block type */

  590.             for (i = 0; i < 4; i++) {

  591.                 memset(&h->intra4x4_pred_mode_cache[scan8[0] + 8*i], DC_PRED, 4);

  592.             }

  593.         }

  594. 

  595.         write_back_intra_pred_mode(h);

  596. 

  597.         if (mb_type == 8) {

  598.             ff_h264_check_intra4x4_pred_mode(h);

  599. 

  600.             h->top_samples_available  = (s->mb_y == 0) ? 0x33FF : 0xFFFF;

  601.             h->left_samples_available = (s->mb_x == 0) ? 0x5F5F : 0xFFFF;

  602.         } else {

  603.             for (i = 0; i < 4; i++) {

  604.                 memset(&h->intra4x4_pred_mode_cache[scan8[0] + 8*i], DC_128_PRED, 4);

  605.             }

  606. 

  607.             h->top_samples_available  = 0x33FF;

  608.             h->left_samples_available = 0x5F5F;

  609.         }

  610. 

  611.         mb_type = MB_TYPE_INTRA4x4;

  612.     } else {                      /* INTRA16x16 */

  613.         dir = i_mb_type_info[mb_type - 8].pred_mode;

  614.         dir = (dir >> 1) ^ 3*(dir & 1) ^ 1;

  615. 

  616.         if ((h->intra16x16_pred_mode = ff_h264_check_intra_pred_mode(h, dir, 0)) == -1){

  617.             av_log(h->s.avctx, AV_LOG_ERROR, "check_intra_pred_mode = -1\n");

  618.             return -1;

  619.         }

  620. 

  621.         cbp = i_mb_type_info[mb_type - 8].cbp;

  622.         mb_type = MB_TYPE_INTRA16x16;

  623.     }

  624. 

  625.     if (!IS_INTER(mb_type) && s->pict_type != AV_PICTURE_TYPE_I) {

  626.         for (i = 0; i < 4; i++) {

  627.             memset(s->current_picture.f.motion_val[0][b_xy + i*h->b_stride], 0, 4*2*sizeof(int16_t));

  628.         }

  629.         if (s->pict_type == AV_PICTURE_TYPE_B) {

  630.             for (i = 0; i < 4; i++) {

  631.                 memset(s->current_picture.f.motion_val[1][b_xy + i*h->b_stride], 0, 4*2*sizeof(int16_t));

  632.             }

  633.         }

  634.     }

  635.     if (!IS_INTRA4x4(mb_type)) {

  636.         memset(h->intra4x4_pred_mode+h->mb2br_xy[mb_xy], DC_PRED, 8);

  637.     }

  638.     if (!IS_SKIP(mb_type) || s->pict_type == AV_PICTURE_TYPE_B) {

  639.         memset(h->non_zero_count_cache + 8, 0, 14*8*sizeof(uint8_t));

  640.         s->dsp.clear_blocks(h->mb+  0);

  641.         s->dsp.clear_blocks(h->mb+384);

  642.     }

  643. 

  644.     if (!IS_INTRA16x16(mb_type) && (!IS_SKIP(mb_type) || s->pict_type == AV_PICTURE_TYPE_B)) {

  645.         if ((vlc = svq3_get_ue_golomb(&s->gb)) >= 48U){

  646.             av_log(h->s.avctx, AV_LOG_ERROR, "cbp_vlc=%d\n", vlc);

  647.             return -1;

  648.         }

  649. 

  650.         cbp = IS_INTRA(mb_type) ? golomb_to_intra4x4_cbp[vlc] : golomb_to_inter_cbp[vlc];

  651.     }

  652.     if (IS_INTRA16x16(mb_type) || (s->pict_type != AV_PICTURE_TYPE_I && s->adaptive_quant && cbp)) {

  653.         s->qscale += svq3_get_se_golomb(&s->gb);

  654. 

  655.         if (s->qscale > 31U){

  656.             av_log(h->s.avctx, AV_LOG_ERROR, "qscale:%d\n", s->qscale);

  657.             return -1;

  658.         }

  659.     }

  660.     if (IS_INTRA16x16(mb_type)) {

  661.         AV_ZERO128(h->mb_luma_dc[0]+0);

  662.         AV_ZERO128(h->mb_luma_dc[0]+8);

  663.         if (svq3_decode_block(&s->gb, *h->mb_luma_dc, 0, 1)){

  664.             av_log(h->s.avctx, AV_LOG_ERROR, "error while decoding intra luma dc\n");

  665.             return -1;

  666.         }

  667.     }

  668. 

  669.     if (cbp) {

  670.         const int index = IS_INTRA16x16(mb_type) ? 1 : 0;

  671.         const int type = ((s->qscale < 24 && IS_INTRA4x4(mb_type)) ? 2 : 1);

  672. 

  673.         for (i = 0; i < 4; i++) {

  674.             if ((cbp & (1 << i))) {

  675.                 for (j = 0; j < 4; j++) {

  676.                     k = index ? ((j&1) + 2*(i&1) + 2*(j&2) + 4*(i&2)) : (4*i + j);

  677.                     h->non_zero_count_cache[ scan8[k] ] = 1;

  678. 

  679.                     if (svq3_decode_block(&s->gb, &h->mb[16*k], index, type)){

  680.                         av_log(h->s.avctx, AV_LOG_ERROR, "error while decoding block\n");

  681.                         return -1;

  682.                     }

  683.                 }

  684.             }

  685.         }

  686. 

  687.         if ((cbp & 0x30)) {

  688.             for (i = 1; i < 3; ++i) {

  689.               if (svq3_decode_block(&s->gb, &h->mb[16*16*i], 0, 3)){

  690.                 av_log(h->s.avctx, AV_LOG_ERROR, "error while decoding chroma dc block\n");

  691.                 return -1;

  692.               }

  693.             }

  694. 

  695.             if ((cbp & 0x20)) {

  696.                 for (i = 1; i < 3; i++) {

  697.                     for (j = 0; j < 4; j++) {

  698.                         k = 16*i + j;

  699.                         h->non_zero_count_cache[ scan8[k] ] = 1;

  700. 

  701.                         if (svq3_decode_block(&s->gb, &h->mb[16*k], 1, 1)){

  702.                             av_log(h->s.avctx, AV_LOG_ERROR, "error while decoding chroma ac block\n");

  703.                             return -1;

  704.                         }

  705.                     }

  706.                 }

  707.             }

  708.         }

  709.     }

  710. 

  711.     h->cbp= cbp;

  712.     s->current_picture.f.mb_type[mb_xy] = mb_type;

  713. 

  714.     if (IS_INTRA(mb_type)) {

  715.         h->chroma_pred_mode = ff_h264_check_intra_pred_mode(h, DC_PRED8x8, 1);

  716.     }

  717. 

  718.     return 0;

  719. }

  720. 

  721. static int svq3_decode_slice_header(AVCodecContext *avctx)

  722. {

  723.     SVQ3Context *svq3 = avctx->priv_data;

  724.     H264Context *h = &svq3->h;

  725.     MpegEncContext *s = &h->s;

  726.     const int mb_xy = h->mb_xy;

  727.     int i, header;

  728. 

  729.     header = get_bits(&s->gb, 8);

  730. 

  731.     if (((header & 0x9F) != 1 && (header & 0x9F) != 2) || (header & 0x60) == 0) {

  732.         /* TODO: what? */

  733.         av_log(avctx, AV_LOG_ERROR, "unsupported slice header (%02X)\n", header);

  734.         return -1;

  735.     } else {

  736.         int length = (header >> 5) & 3;

  737. 

  738.         svq3->next_slice_index = get_bits_count(&s->gb) + 8*show_bits(&s->gb, 8*length) + 8*length;

  739. 

  740.         if (svq3->next_slice_index > s->gb.size_in_bits) {

  741.             av_log(avctx, AV_LOG_ERROR, "slice after bitstream end\n");

  742.             return -1;

  743.     }

  744. 

  745.         s->gb.size_in_bits = svq3->next_slice_index - 8*(length - 1);

  746.         skip_bits(&s->gb, 8);

  747. 

  748.         if (svq3->watermark_key) {

  749.             uint32_t header = AV_RL32(&s->gb.buffer[(get_bits_count(&s->gb)>>3)+1]);

  750.             AV_WL32(&s->gb.buffer[(get_bits_count(&s->gb)>>3)+1], header ^ svq3->watermark_key);

  751.         }

  752.         if (length > 0) {

  753.             memcpy((uint8_t *) &s->gb.buffer[get_bits_count(&s->gb) >> 3],

  754.                    &s->gb.buffer[s->gb.size_in_bits >> 3], (length - 1));

  755.         }

  756.         skip_bits_long(&s->gb, 0);

  757.     }

  758. 

  759.     if ((i = svq3_get_ue_golomb(&s->gb)) >= 3U){

  760.         av_log(h->s.avctx, AV_LOG_ERROR, "illegal slice type %d \n", i);

  761.         return -1;

  762.     }

  763. 

  764.     h->slice_type = golomb_to_pict_type[i];

  765. 

  766.     if ((header & 0x9F) == 2) {

  767.         i = (s->mb_num < 64) ? 6 : (1 + av_log2 (s->mb_num - 1));

  768.         s->mb_skip_run = get_bits(&s->gb, i) - (s->mb_x + (s->mb_y * s->mb_width));

  769.     } else {

  770.         skip_bits1(&s->gb);

  771.         s->mb_skip_run = 0;

  772.     }

  773. 

  774.     h->slice_num = get_bits(&s->gb, 8);

  775.     s->qscale = get_bits(&s->gb, 5);

  776.     s->adaptive_quant = get_bits1(&s->gb);

  777. 

  778.     /* unknown fields */

  779.     skip_bits1(&s->gb);

  780. 

  781.     if (svq3->unknown_flag) {

  782.         skip_bits1(&s->gb);

  783.     }

  784. 

  785.     skip_bits1(&s->gb);

  786.     skip_bits(&s->gb, 2);

  787. 

  788.     while (get_bits1(&s->gb)) {

  789.         skip_bits(&s->gb, 8);

  790.     }

  791. 

  792.     /* reset intra predictors and invalidate motion vector references */

  793.     if (s->mb_x > 0) {

  794.         memset(h->intra4x4_pred_mode+h->mb2br_xy[mb_xy - 1      ]+3, -1, 4*sizeof(int8_t));

  795.         memset(h->intra4x4_pred_mode+h->mb2br_xy[mb_xy - s->mb_x]  , -1, 8*sizeof(int8_t)*s->mb_x);

  796.     }

  797.     if (s->mb_y > 0) {

  798.         memset(h->intra4x4_pred_mode+h->mb2br_xy[mb_xy - s->mb_stride], -1, 8*sizeof(int8_t)*(s->mb_width - s->mb_x));

  799. 

  800.         if (s->mb_x > 0) {

  801.             h->intra4x4_pred_mode[h->mb2br_xy[mb_xy - s->mb_stride - 1]+3] = -1;

  802.         }

  803.     }

  804. 

  805.     return 0;

  806. }

  807. 

  808. static av_cold int svq3_decode_init(AVCodecContext *avctx)

  809. {

  810.     SVQ3Context *svq3 = avctx->priv_data;

  811.     H264Context *h = &svq3->h;

  812.     MpegEncContext *s = &h->s;

  813.     int m;

  814.     unsigned char *extradata;

  815.     unsigned char *extradata_end;

  816.     unsigned int size;

  817.     int marker_found = 0;

  818. 

  819.     if (ff_h264_decode_init(avctx) < 0)

  820.         return -1;

  821. 

  822.     s->flags  = avctx->flags;

  823.     s->flags2 = avctx->flags2;

  824.     s->unrestricted_mv = 1;

  825.     h->is_complex=1;

  826.     h->sps.chroma_format_idc = 1;

  827.     avctx->pix_fmt = avctx->codec->pix_fmts[0];

  828. 

  829.     if (!s->context_initialized) {

  830.         h->chroma_qp[0] = h->chroma_qp[1] = 4;

  831. 

  832.         svq3->halfpel_flag  = 1;

  833.         svq3->thirdpel_flag = 1;

  834.         svq3->unknown_flag  = 0;

  835. 

  836. 

  837.         /* prowl for the "SEQH" marker in the extradata */

  838.         extradata = (unsigned char *)avctx->extradata;

  839.         extradata_end = avctx->extradata + avctx->extradata_size;

  840.         if (extradata) {

  841.             for (m = 0; m + 8 < avctx->extradata_size; m++) {

  842.                 if (!memcmp(extradata, "SEQH", 4)) {

  843.                     marker_found = 1;

  844.                     break;

  845.                 }

  846.                 extradata++;

  847.             }

  848.         }

  849. 

  850.         /* if a match was found, parse the extra data */

  851.         if (marker_found) {

  852. 

  853.             GetBitContext gb;

  854.             int frame_size_code;

  855. 

  856.             size = AV_RB32(&extradata[4]);

  857.             if (size > extradata_end - extradata - 8)

  858.                 return AVERROR_INVALIDDATA;

  859.             init_get_bits(&gb, extradata + 8, size*8);

  860. 

  861.             /* 'frame size code' and optional 'width, height' */

  862.             frame_size_code = get_bits(&gb, 3);

  863.             switch (frame_size_code) {

  864.                 case 0: avctx->width = 160; avctx->height = 120; break;

  865.                 case 1: avctx->width = 128; avctx->height =  96; break;

  866.                 case 2: avctx->width = 176; avctx->height = 144; break;

  867.                 case 3: avctx->width = 352; avctx->height = 288; break;

  868.                 case 4: avctx->width = 704; avctx->height = 576; break;

  869.                 case 5: avctx->width = 240; avctx->height = 180; break;

  870.                 case 6: avctx->width = 320; avctx->height = 240; break;

  871.                 case 7:

  872.                     avctx->width  = get_bits(&gb, 12);

  873.                     avctx->height = get_bits(&gb, 12);

  874.                     break;

  875.             }

  876. 

  877.             svq3->halfpel_flag  = get_bits1(&gb);

  878.             svq3->thirdpel_flag = get_bits1(&gb);

  879. 

  880.             /* unknown fields */

  881.             skip_bits1(&gb);

  882.             skip_bits1(&gb);

  883.             skip_bits1(&gb);

  884.             skip_bits1(&gb);

  885. 

  886.             s->low_delay = get_bits1(&gb);

  887. 

  888.             /* unknown field */

  889.             skip_bits1(&gb);

  890. 

  891.             while (get_bits1(&gb)) {

  892.                 skip_bits(&gb, 8);

  893.             }

  894. 

  895.             svq3->unknown_flag = get_bits1(&gb);

  896.             avctx->has_b_frames = !s->low_delay;

  897.             if (svq3->unknown_flag) {

  898. #if CONFIG_ZLIB

  899.                 unsigned watermark_width  = svq3_get_ue_golomb(&gb);

  900.                 unsigned watermark_height = svq3_get_ue_golomb(&gb);

  901.                 int u1 = svq3_get_ue_golomb(&gb);

  902.                 int u2 = get_bits(&gb, 8);

  903.                 int u3 = get_bits(&gb, 2);

  904.                 int u4 = svq3_get_ue_golomb(&gb);

  905.                 unsigned long buf_len = watermark_width*watermark_height*4;

  906.                 int offset = (get_bits_count(&gb)+7)>>3;

  907.                 uint8_t *buf;

  908. 

  909.                 if (watermark_height<=0 || (uint64_t)watermark_width*4 > UINT_MAX/watermark_height)

  910.                     return -1;

  911. 

  912.                 buf = av_malloc(buf_len);

  913.                 av_log(avctx, AV_LOG_DEBUG, "watermark size: %dx%d\n", watermark_width, watermark_height);

  914.                 av_log(avctx, AV_LOG_DEBUG, "u1: %x u2: %x u3: %x compressed data size: %d offset: %d\n", u1, u2, u3, u4, offset);

  915.                 if (uncompress(buf, &buf_len, extradata + 8 + offset, size - offset) != Z_OK) {

  916.                     av_log(avctx, AV_LOG_ERROR, "could not uncompress watermark logo\n");

  917.                     av_free(buf);

  918.                     return -1;

  919.                 }

  920.                 svq3->watermark_key = ff_svq1_packet_checksum(buf, buf_len, 0);

  921.                 svq3->watermark_key = svq3->watermark_key << 16 | svq3->watermark_key;

  922.                 av_log(avctx, AV_LOG_DEBUG, "watermark key %#x\n", svq3->watermark_key);

  923.                 av_free(buf);

  924. #else

  925.                 av_log(avctx, AV_LOG_ERROR, "this svq3 file contains watermark which need zlib support compiled in\n");

  926.                 return -1;

  927. #endif

  928.             }

  929.         }

  930. 

  931.         s->width  = avctx->width;

  932.         s->height = avctx->height;

  933. 

  934.         if (ff_MPV_common_init(s) < 0)

  935.             return -1;

  936. 

  937.         h->b_stride = 4*s->mb_width;

  938. 

  939.         if (ff_h264_alloc_tables(h) < 0) {

  940.             av_log(avctx, AV_LOG_ERROR, "svq3 memory allocation failed\n");

  941.             return AVERROR(ENOMEM);

  942.         }

  943.     }

  944. 

  945.     return 0;

  946. }

  947. 

  948. static int svq3_decode_frame(AVCodecContext *avctx,

  949.                              void *data, int *data_size,

  950.                              AVPacket *avpkt)

  951. {

  952.     SVQ3Context *svq3 = avctx->priv_data;

  953.     H264Context *h = &svq3->h;

  954.     MpegEncContext *s = &h->s;

  955.     int buf_size = avpkt->size;

  956.     int m, mb_type, left;

  957.     uint8_t *buf;

  958. 

  959.     /* special case for last picture */

  960.     if (buf_size == 0) {

  961.         if (s->next_picture_ptr && !s->low_delay) {

  962.             *(AVFrame *) data   = s->next_picture.f;

  963.             s->next_picture_ptr = NULL;

  964.             *data_size = sizeof(AVFrame);

  965.         }

  966.         return 0;

  967.     }

  968. 

  969.     s->mb_x = s->mb_y = h->mb_xy = 0;

  970. 

  971.     if (svq3->watermark_key) {

  972.         av_fast_malloc(&svq3->buf, &svq3->buf_size,

  973.                        buf_size+FF_INPUT_BUFFER_PADDING_SIZE);

  974.         if (!svq3->buf)

  975.             return AVERROR(ENOMEM);

  976.         memcpy(svq3->buf, avpkt->data, buf_size);

  977.         buf = svq3->buf;

  978.     } else {

  979.         buf = avpkt->data;

  980.     }

  981. 

  982.     init_get_bits(&s->gb, buf, 8*buf_size);

  983. 

  984.     if (svq3_decode_slice_header(avctx))

  985.         return -1;

  986. 

  987.     s->pict_type = h->slice_type;

  988.     s->picture_number = h->slice_num;

  989. 

  990.     if (avctx->debug&FF_DEBUG_PICT_INFO){

  991.         av_log(h->s.avctx, AV_LOG_DEBUG, "%c hpel:%d, tpel:%d aqp:%d qp:%d, slice_num:%02X\n",

  992.                av_get_picture_type_char(s->pict_type), svq3->halfpel_flag, svq3->thirdpel_flag,

  993.                s->adaptive_quant, s->qscale, h->slice_num);

  994.     }

  995. 

  996.     /* for skipping the frame */

  997.     s->current_picture.f.pict_type = s->pict_type;

  998.     s->current_picture.f.key_frame = (s->pict_type == AV_PICTURE_TYPE_I);

  999. 

  1000.     /* Skip B-frames if we do not have reference frames. */

  1001.     if (s->last_picture_ptr == NULL && s->pict_type == AV_PICTURE_TYPE_B)

  1002.         return 0;

  1003.     if (  (avctx->skip_frame >= AVDISCARD_NONREF && s->pict_type == AV_PICTURE_TYPE_B)

  1004.         ||(avctx->skip_frame >= AVDISCARD_NONKEY && s->pict_type != AV_PICTURE_TYPE_I)

  1005.         || avctx->skip_frame >= AVDISCARD_ALL)

  1006.         return 0;

  1007. 

  1008.     if (s->next_p_frame_damaged) {

  1009.         if (s->pict_type == AV_PICTURE_TYPE_B)

  1010.             return 0;

  1011.         else

  1012.             s->next_p_frame_damaged = 0;

  1013.     }

  1014. 

  1015.     if (ff_h264_frame_start(h) < 0)

  1016.         return -1;

  1017. 

  1018.     if (s->pict_type == AV_PICTURE_TYPE_B) {

  1019.         h->frame_num_offset = (h->slice_num - h->prev_frame_num);

  1020. 

  1021.         if (h->frame_num_offset < 0) {

  1022.             h->frame_num_offset += 256;

  1023.         }

  1024.         if (h->frame_num_offset == 0 || h->frame_num_offset >= h->prev_frame_num_offset) {

  1025.             av_log(h->s.avctx, AV_LOG_ERROR, "error in B-frame picture id\n");

  1026.             return -1;

  1027.         }

  1028.     } else {

  1029.         h->prev_frame_num = h->frame_num;

  1030.         h->frame_num = h->slice_num;

  1031.         h->prev_frame_num_offset = (h->frame_num - h->prev_frame_num);

  1032. 

  1033.         if (h->prev_frame_num_offset < 0) {

  1034.             h->prev_frame_num_offset += 256;

  1035.         }

  1036.     }

  1037. 

  1038.     for (m = 0; m < 2; m++){

  1039.         int i;

  1040.         for (i = 0; i < 4; i++){

  1041.             int j;

  1042.             for (j = -1; j < 4; j++)

  1043.                 h->ref_cache[m][scan8[0] + 8*i + j]= 1;

  1044.             if (i < 3)

  1045.                 h->ref_cache[m][scan8[0] + 8*i + j]= PART_NOT_AVAILABLE;

  1046.         }

  1047.     }

  1048. 

  1049.     for (s->mb_y = 0; s->mb_y < s->mb_height; s->mb_y++) {

  1050.         for (s->mb_x = 0; s->mb_x < s->mb_width; s->mb_x++) {

  1051.             h->mb_xy = s->mb_x + s->mb_y*s->mb_stride;

  1052. 

  1053.             if ( (get_bits_count(&s->gb) + 7) >= s->gb.size_in_bits &&

  1054.                 ((get_bits_count(&s->gb) & 7) == 0 || show_bits(&s->gb, (-get_bits_count(&s->gb) & 7)) == 0)) {

  1055. 

  1056.                 skip_bits(&s->gb, svq3->next_slice_index - get_bits_count(&s->gb));

  1057.                 s->gb.size_in_bits = 8*buf_size;

  1058. 

  1059.                 if (svq3_decode_slice_header(avctx))

  1060.                     return -1;

  1061. 

  1062.                 /* TODO: support s->mb_skip_run */

  1063.             }

  1064. 

  1065.             mb_type = svq3_get_ue_golomb(&s->gb);

  1066. 

  1067.             if (s->pict_type == AV_PICTURE_TYPE_I) {

  1068.                 mb_type += 8;

  1069.             } else if (s->pict_type == AV_PICTURE_TYPE_B && mb_type >= 4) {

  1070.                 mb_type += 4;

  1071.             }

  1072.             if ((unsigned)mb_type > 33 || svq3_decode_mb(svq3, mb_type)) {

  1073.                 av_log(h->s.avctx, AV_LOG_ERROR, "error while decoding MB %d %d\n", s->mb_x, s->mb_y);

  1074.                 return -1;

  1075.             }

  1076. 

  1077.             if (mb_type != 0) {

  1078.                 ff_h264_hl_decode_mb (h);

  1079.             }

  1080. 

  1081.             if (s->pict_type != AV_PICTURE_TYPE_B && !s->low_delay) {

  1082.                 s->current_picture.f.mb_type[s->mb_x + s->mb_y * s->mb_stride] =

  1083.                     (s->pict_type == AV_PICTURE_TYPE_P && mb_type < 8) ? (mb_type - 1) : -1;

  1084.             }

  1085.         }

  1086. 

  1087.         ff_draw_horiz_band(s, 16*s->mb_y, 16);

  1088.     }

  1089. 

  1090.     left = buf_size*8 - get_bits_count(&s->gb);

  1091. 

  1092.     if (s->mb_y != s->mb_height || s->mb_x != s->mb_width) {

  1093.         av_log(avctx, AV_LOG_INFO, "frame num %d incomplete pic x %d y %d left %d\n", avctx->frame_number, s->mb_y, s->mb_x, left);

  1094.         //av_hex_dump(stderr, buf+buf_size-8, 8);

  1095.     }

  1096. 

  1097.     if (left < 0) {

  1098.         av_log(avctx, AV_LOG_ERROR, "frame num %d left %d\n", avctx->frame_number, left);

  1099.         return -1;

  1100.     }

  1101. 

  1102.     ff_MPV_frame_end(s);

  1103. 

  1104.     if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {

  1105.         *(AVFrame *) data = s->current_picture.f;

  1106.     } else {

  1107.         *(AVFrame *) data = s->last_picture.f;

  1108.     }

  1109. 

  1110.     /* Do not output the last pic after seeking. */

  1111.     if (s->last_picture_ptr || s->low_delay) {

  1112.         *data_size = sizeof(AVFrame);

  1113.     }

  1114. 

  1115.     return buf_size;

  1116. }

  1117. 

  1118. static int svq3_decode_end(AVCodecContext *avctx)

  1119. {

  1120.     SVQ3Context *svq3 = avctx->priv_data;

  1121.     H264Context *h = &svq3->h;

  1122.     MpegEncContext *s = &h->s;

  1123. 

  1124.     ff_h264_free_context(h);

  1125. 

  1126.     ff_MPV_common_end(s);

  1127. 

  1128.     av_freep(&svq3->buf);

  1129.     svq3->buf_size = 0;

  1130. 

  1131.     return 0;

  1132. }

  1133. 

  1134. AVCodec ff_svq3_decoder = {

  1135.     .name           = "svq3",

  1136.     .type           = AVMEDIA_TYPE_VIDEO,

  1137.     .id             = AV_CODEC_ID_SVQ3,

  1138.     .priv_data_size = sizeof(SVQ3Context),

  1139.     .init           = svq3_decode_init,

  1140.     .close          = svq3_decode_end,

  1141.     .decode         = svq3_decode_frame,

  1142.     .capabilities   = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |

  1143.                       CODEC_CAP_DELAY,

  1144.     .long_name      = NULL_IF_CONFIG_SMALL("Sorenson Vector Quantizer 3 / Sorenson Video 3 / SVQ3"),

  1145.     .pix_fmts       = (const enum PixelFormat[]){ PIX_FMT_YUVJ420P, PIX_FMT_NONE },

  1146. };