X-Git-Url: https://git.pterodactylus.net/?a=blobdiff_plain;f=synfig-core%2Ftags%2Fsynfig_0_61_04%2Fsynfig-core%2Fsrc%2Fmodules%2Fmod_libavcodec%2Flibavcodec%2Fsvq1.c;fp=synfig-core%2Ftags%2Fsynfig_0_61_04%2Fsynfig-core%2Fsrc%2Fmodules%2Fmod_libavcodec%2Flibavcodec%2Fsvq1.c;h=bce799639902b061b9efaccdd3f5c5dfe9448040;hb=f64373f72487d6aa502d9bde985b8a2d5519f099;hp=0000000000000000000000000000000000000000;hpb=ad81c2528eb79c7500e65fd15a9f66375f75d121;p=synfig.git diff --git a/synfig-core/tags/synfig_0_61_04/synfig-core/src/modules/mod_libavcodec/libavcodec/svq1.c b/synfig-core/tags/synfig_0_61_04/synfig-core/src/modules/mod_libavcodec/libavcodec/svq1.c new file mode 100644 index 0000000..bce7996 --- /dev/null +++ b/synfig-core/tags/synfig_0_61_04/synfig-core/src/modules/mod_libavcodec/libavcodec/svq1.c @@ -0,0 +1,842 @@ +/* + * + * Copyright (C) 2002 the xine project + * Copyright (C) 2002 the ffmpeg project + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + * Ported to mplayer by Arpi + * Ported to libavcodec by Nick Kurshev + * + */ + +/** + * @file svq1.c + * Sorenson Vector Quantizer #1 (SVQ1) video decoder. + */ + + +//#define DEBUG_SVQ1 +#include +#include +#include +#include + +#include "common.h" +#include "avcodec.h" +#include "dsputil.h" +#include "mpegvideo.h" +#include "bswap.h" + +static VLC svq1_block_type; +static VLC svq1_motion_component; +static VLC svq1_intra_multistage[6]; +static VLC svq1_inter_multistage[6]; +static VLC svq1_intra_mean; +static VLC svq1_inter_mean; + +#define MEDIAN(a,b,c) (((a < b) != (b >= c)) ? b : (((a < c) != (c > b)) ? c : a)) + +#define SVQ1_BLOCK_SKIP 0 +#define SVQ1_BLOCK_INTER 1 +#define SVQ1_BLOCK_INTER_4V 2 +#define SVQ1_BLOCK_INTRA 3 + +/* motion vector (prediction) */ +typedef struct svq1_pmv_s { + int x; + int y; +} svq1_pmv_t; + +#include "svq1_cb.h" +#include "svq1_vlc.h" + +static const uint16_t checksum_table[256] = { + 0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50A5, 0x60C6, 0x70E7, + 0x8108, 0x9129, 0xA14A, 0xB16B, 0xC18C, 0xD1AD, 0xE1CE, 0xF1EF, + 0x1231, 0x0210, 0x3273, 0x2252, 0x52B5, 0x4294, 0x72F7, 0x62D6, + 0x9339, 0x8318, 0xB37B, 0xA35A, 0xD3BD, 0xC39C, 0xF3FF, 0xE3DE, + 0x2462, 0x3443, 0x0420, 0x1401, 0x64E6, 0x74C7, 0x44A4, 0x5485, + 0xA56A, 0xB54B, 0x8528, 0x9509, 0xE5EE, 0xF5CF, 0xC5AC, 0xD58D, + 0x3653, 0x2672, 0x1611, 0x0630, 0x76D7, 0x66F6, 0x5695, 0x46B4, + 0xB75B, 0xA77A, 0x9719, 0x8738, 0xF7DF, 0xE7FE, 0xD79D, 0xC7BC, + 0x48C4, 0x58E5, 0x6886, 0x78A7, 0x0840, 0x1861, 0x2802, 0x3823, + 0xC9CC, 0xD9ED, 0xE98E, 0xF9AF, 0x8948, 0x9969, 0xA90A, 0xB92B, + 0x5AF5, 0x4AD4, 0x7AB7, 0x6A96, 0x1A71, 0x0A50, 0x3A33, 0x2A12, + 0xDBFD, 0xCBDC, 0xFBBF, 0xEB9E, 0x9B79, 0x8B58, 0xBB3B, 0xAB1A, + 0x6CA6, 0x7C87, 0x4CE4, 0x5CC5, 0x2C22, 0x3C03, 0x0C60, 0x1C41, + 0xEDAE, 0xFD8F, 0xCDEC, 0xDDCD, 0xAD2A, 0xBD0B, 0x8D68, 0x9D49, + 0x7E97, 0x6EB6, 0x5ED5, 0x4EF4, 0x3E13, 0x2E32, 0x1E51, 0x0E70, + 0xFF9F, 0xEFBE, 0xDFDD, 0xCFFC, 0xBF1B, 0xAF3A, 0x9F59, 0x8F78, + 0x9188, 0x81A9, 0xB1CA, 0xA1EB, 0xD10C, 0xC12D, 0xF14E, 0xE16F, + 0x1080, 0x00A1, 0x30C2, 0x20E3, 0x5004, 0x4025, 0x7046, 0x6067, + 0x83B9, 0x9398, 0xA3FB, 0xB3DA, 0xC33D, 0xD31C, 0xE37F, 0xF35E, + 0x02B1, 0x1290, 0x22F3, 0x32D2, 0x4235, 0x5214, 0x6277, 0x7256, + 0xB5EA, 0xA5CB, 0x95A8, 0x8589, 0xF56E, 0xE54F, 0xD52C, 0xC50D, + 0x34E2, 0x24C3, 0x14A0, 0x0481, 0x7466, 0x6447, 0x5424, 0x4405, + 0xA7DB, 0xB7FA, 0x8799, 0x97B8, 0xE75F, 0xF77E, 0xC71D, 0xD73C, + 0x26D3, 0x36F2, 0x0691, 0x16B0, 0x6657, 0x7676, 0x4615, 0x5634, + 0xD94C, 0xC96D, 0xF90E, 0xE92F, 0x99C8, 0x89E9, 0xB98A, 0xA9AB, + 0x5844, 0x4865, 0x7806, 0x6827, 0x18C0, 0x08E1, 0x3882, 0x28A3, + 0xCB7D, 0xDB5C, 0xEB3F, 0xFB1E, 0x8BF9, 0x9BD8, 0xABBB, 0xBB9A, + 0x4A75, 0x5A54, 0x6A37, 0x7A16, 0x0AF1, 0x1AD0, 0x2AB3, 0x3A92, + 0xFD2E, 0xED0F, 0xDD6C, 0xCD4D, 0xBDAA, 0xAD8B, 0x9DE8, 0x8DC9, + 0x7C26, 0x6C07, 0x5C64, 0x4C45, 0x3CA2, 0x2C83, 0x1CE0, 0x0CC1, + 0xEF1F, 0xFF3E, 0xCF5D, 0xDF7C, 0xAF9B, 0xBFBA, 0x8FD9, 0x9FF8, + 0x6E17, 0x7E36, 0x4E55, 0x5E74, 0x2E93, 0x3EB2, 0x0ED1, 0x1EF0 +}; + +static const uint8_t string_table[256] = { + 0x00, 0xD5, 0x7F, 0xAA, 0xFE, 0x2B, 0x81, 0x54, + 0x29, 0xFC, 0x56, 0x83, 0xD7, 0x02, 0xA8, 0x7D, + 0x52, 0x87, 0x2D, 0xF8, 0xAC, 0x79, 0xD3, 0x06, + 0x7B, 0xAE, 0x04, 0xD1, 0x85, 0x50, 0xFA, 0x2F, + 0xA4, 0x71, 0xDB, 0x0E, 0x5A, 0x8F, 0x25, 0xF0, + 0x8D, 0x58, 0xF2, 0x27, 0x73, 0xA6, 0x0C, 0xD9, + 0xF6, 0x23, 0x89, 0x5C, 0x08, 0xDD, 0x77, 0xA2, + 0xDF, 0x0A, 0xA0, 0x75, 0x21, 0xF4, 0x5E, 0x8B, + 0x9D, 0x48, 0xE2, 0x37, 0x63, 0xB6, 0x1C, 0xC9, + 0xB4, 0x61, 0xCB, 0x1E, 0x4A, 0x9F, 0x35, 0xE0, + 0xCF, 0x1A, 0xB0, 0x65, 0x31, 0xE4, 0x4E, 0x9B, + 0xE6, 0x33, 0x99, 0x4C, 0x18, 0xCD, 0x67, 0xB2, + 0x39, 0xEC, 0x46, 0x93, 0xC7, 0x12, 0xB8, 0x6D, + 0x10, 0xC5, 0x6F, 0xBA, 0xEE, 0x3B, 0x91, 0x44, + 0x6B, 0xBE, 0x14, 0xC1, 0x95, 0x40, 0xEA, 0x3F, + 0x42, 0x97, 0x3D, 0xE8, 0xBC, 0x69, 0xC3, 0x16, + 0xEF, 0x3A, 0x90, 0x45, 0x11, 0xC4, 0x6E, 0xBB, + 0xC6, 0x13, 0xB9, 0x6C, 0x38, 0xED, 0x47, 0x92, + 0xBD, 0x68, 0xC2, 0x17, 0x43, 0x96, 0x3C, 0xE9, + 0x94, 0x41, 0xEB, 0x3E, 0x6A, 0xBF, 0x15, 0xC0, + 0x4B, 0x9E, 0x34, 0xE1, 0xB5, 0x60, 0xCA, 0x1F, + 0x62, 0xB7, 0x1D, 0xC8, 0x9C, 0x49, 0xE3, 0x36, + 0x19, 0xCC, 0x66, 0xB3, 0xE7, 0x32, 0x98, 0x4D, + 0x30, 0xE5, 0x4F, 0x9A, 0xCE, 0x1B, 0xB1, 0x64, + 0x72, 0xA7, 0x0D, 0xD8, 0x8C, 0x59, 0xF3, 0x26, + 0x5B, 0x8E, 0x24, 0xF1, 0xA5, 0x70, 0xDA, 0x0F, + 0x20, 0xF5, 0x5F, 0x8A, 0xDE, 0x0B, 0xA1, 0x74, + 0x09, 0xDC, 0x76, 0xA3, 0xF7, 0x22, 0x88, 0x5D, + 0xD6, 0x03, 0xA9, 0x7C, 0x28, 0xFD, 0x57, 0x82, + 0xFF, 0x2A, 0x80, 0x55, 0x01, 0xD4, 0x7E, 0xAB, + 0x84, 0x51, 0xFB, 0x2E, 0x7A, 0xAF, 0x05, 0xD0, + 0xAD, 0x78, 0xD2, 0x07, 0x53, 0x86, 0x2C, 0xF9 +}; + +#define SVQ1_PROCESS_VECTOR()\ + for (; level > 0; i++) {\ + /* process next depth */\ + if (i == m) {\ + m = n;\ + if (--level == 0)\ + break;\ + }\ + /* divide block if next bit set */\ + if (get_bits (bitbuf, 1) == 0)\ + break;\ + /* add child nodes */\ + list[n++] = list[i];\ + list[n++] = list[i] + (((level & 1) ? pitch : 1) << ((level / 2) + 1));\ + } + +#define SVQ1_ADD_CODEBOOK()\ + /* add codebook entries to vector */\ + for (j=0; j < stages; j++) {\ + n3 = codebook[entries[j]] ^ 0x80808080;\ + n1 += ((n3 & 0xFF00FF00) >> 8);\ + n2 += (n3 & 0x00FF00FF);\ + }\ +\ + /* clip to [0..255] */\ + if (n1 & 0xFF00FF00) {\ + n3 = ((( n1 >> 15) & 0x00010001) | 0x01000100) - 0x00010001;\ + n1 += 0x7F007F00;\ + n1 |= (((~n1 >> 15) & 0x00010001) | 0x01000100) - 0x00010001;\ + n1 &= (n3 & 0x00FF00FF);\ + }\ +\ + if (n2 & 0xFF00FF00) {\ + n3 = ((( n2 >> 15) & 0x00010001) | 0x01000100) - 0x00010001;\ + n2 += 0x7F007F00;\ + n2 |= (((~n2 >> 15) & 0x00010001) | 0x01000100) - 0x00010001;\ + n2 &= (n3 & 0x00FF00FF);\ + } + +#define SVQ1_DO_CODEBOOK_INTRA()\ + for (y=0; y < height; y++) {\ + for (x=0; x < (width / 4); x++, codebook++) {\ + n1 = n4;\ + n2 = n4;\ + SVQ1_ADD_CODEBOOK()\ + /* store result */\ + dst[x] = (n1 << 8) | n2;\ + }\ + dst += (pitch / 4);\ + } + +#define SVQ1_DO_CODEBOOK_NONINTRA()\ + for (y=0; y < height; y++) {\ + for (x=0; x < (width / 4); x++, codebook++) {\ + n3 = dst[x];\ + /* add mean value to vector */\ + n1 = ((n3 & 0xFF00FF00) >> 8) + n4;\ + n2 = (n3 & 0x00FF00FF) + n4;\ + SVQ1_ADD_CODEBOOK()\ + /* store result */\ + dst[x] = (n1 << 8) | n2;\ + }\ + dst += (pitch / 4);\ + } + +#define SVQ1_CALC_CODEBOOK_ENTRIES(cbook)\ + codebook = (const uint32_t *) cbook[level];\ + bit_cache = get_bits (bitbuf, 4*stages);\ + /* calculate codebook entries for this vector */\ + for (j=0; j < stages; j++) {\ + entries[j] = (((bit_cache >> (4*(stages - j - 1))) & 0xF) + 16*j) << (level + 1);\ + }\ + mean -= (stages * 128);\ + n4 = ((mean + (mean >> 31)) << 16) | (mean & 0xFFFF); + +static int svq1_decode_block_intra (GetBitContext *bitbuf, uint8_t *pixels, int pitch ) { + uint32_t bit_cache; + uint8_t *list[63]; + uint32_t *dst; + const uint32_t *codebook; + int entries[6]; + int i, j, m, n; + int mean, stages; + unsigned x, y, width, height, level; + uint32_t n1, n2, n3, n4; + + /* initialize list for breadth first processing of vectors */ + list[0] = pixels; + + /* recursively process vector */ + for (i=0, m=1, n=1, level=5; i < n; i++) { + SVQ1_PROCESS_VECTOR(); + + /* destination address and vector size */ + dst = (uint32_t *) list[i]; + width = 1 << ((4 + level) /2); + height = 1 << ((3 + level) /2); + + /* get number of stages (-1 skips vector, 0 for mean only) */ + stages = get_vlc2(bitbuf, svq1_intra_multistage[level].table, 3, 3) - 1; + + if (stages == -1) { + for (y=0; y < height; y++) { + memset (&dst[y*(pitch / 4)], 0, width); + } + continue; /* skip vector */ + } + + if ((stages > 0) && (level >= 4)) { +#ifdef DEBUG_SVQ1 + printf("Error (svq1_decode_block_intra): invalid vector: stages=%i level=%i\n",stages,level); +#endif + return -1; /* invalid vector */ + } + + mean = get_vlc2(bitbuf, svq1_intra_mean.table, 8, 3); + + if (stages == 0) { + for (y=0; y < height; y++) { + memset (&dst[y*(pitch / 4)], mean, width); + } + } else { + SVQ1_CALC_CODEBOOK_ENTRIES(svq1_intra_codebooks); + SVQ1_DO_CODEBOOK_INTRA() + } + } + + return 0; +} + +static int svq1_decode_block_non_intra (GetBitContext *bitbuf, uint8_t *pixels, int pitch ) { + uint32_t bit_cache; + uint8_t *list[63]; + uint32_t *dst; + const uint32_t *codebook; + int entries[6]; + int i, j, m, n; + int mean, stages; + int x, y, width, height, level; + uint32_t n1, n2, n3, n4; + + /* initialize list for breadth first processing of vectors */ + list[0] = pixels; + + /* recursively process vector */ + for (i=0, m=1, n=1, level=5; i < n; i++) { + SVQ1_PROCESS_VECTOR(); + + /* destination address and vector size */ + dst = (uint32_t *) list[i]; + width = 1 << ((4 + level) /2); + height = 1 << ((3 + level) /2); + + /* get number of stages (-1 skips vector, 0 for mean only) */ + stages = get_vlc2(bitbuf, svq1_inter_multistage[level].table, 3, 2) - 1; + + if (stages == -1) continue; /* skip vector */ + + if ((stages > 0) && (level >= 4)) { +#ifdef DEBUG_SVQ1 + printf("Error (svq1_decode_block_non_intra): invalid vector: stages=%i level=%i\n",stages,level); +#endif + return -1; /* invalid vector */ + } + + mean = get_vlc2(bitbuf, svq1_inter_mean.table, 9, 3) - 256; + + SVQ1_CALC_CODEBOOK_ENTRIES(svq1_inter_codebooks); + SVQ1_DO_CODEBOOK_NONINTRA() + } + return 0; +} + +static int svq1_decode_motion_vector (GetBitContext *bitbuf, svq1_pmv_t *mv, svq1_pmv_t **pmv) { + int diff; + int i; + + for (i=0; i < 2; i++) { + + /* get motion code */ + diff = get_vlc2(bitbuf, svq1_motion_component.table, 7, 2) - 32; + + /* add median of motion vector predictors and clip result */ + if (i == 1) + mv->y = ((diff + MEDIAN(pmv[0]->y, pmv[1]->y, pmv[2]->y)) << 26) >> 26; + else + mv->x = ((diff + MEDIAN(pmv[0]->x, pmv[1]->x, pmv[2]->x)) << 26) >> 26; + } + + return 0; +} + +static void svq1_skip_block (uint8_t *current, uint8_t *previous, int pitch, int x, int y) { + uint8_t *src; + uint8_t *dst; + int i; + + src = &previous[x + y*pitch]; + dst = current; + + for (i=0; i < 16; i++) { + memcpy (dst, src, 16); + src += pitch; + dst += pitch; + } +} + +static int svq1_motion_inter_block (MpegEncContext *s, GetBitContext *bitbuf, + uint8_t *current, uint8_t *previous, int pitch, + svq1_pmv_t *motion, int x, int y) { + uint8_t *src; + uint8_t *dst; + svq1_pmv_t mv; + svq1_pmv_t *pmv[3]; + int result; + + /* predict and decode motion vector */ + pmv[0] = &motion[0]; + if (y == 0) { + pmv[1] = + pmv[2] = pmv[0]; + } + else { + pmv[1] = &motion[(x / 8) + 2]; + pmv[2] = &motion[(x / 8) + 4]; + } + + result = svq1_decode_motion_vector (bitbuf, &mv, pmv); + + if (result != 0) + return result; + + motion[0].x = + motion[(x / 8) + 2].x = + motion[(x / 8) + 3].x = mv.x; + motion[0].y = + motion[(x / 8) + 2].y = + motion[(x / 8) + 3].y = mv.y; + + if(y + (mv.y >> 1)<0) + mv.y= 0; + if(x + (mv.x >> 1)<0) + mv.x= 0; + +#if 0 + int w= (s->width+15)&~15; + int h= (s->height+15)&~15; + if(x + (mv.x >> 1)<0 || y + (mv.y >> 1)<0 || x + (mv.x >> 1) + 16 > w || y + (mv.y >> 1) + 16> h) + printf("%d %d %d %d\n", x, y, x + (mv.x >> 1), y + (mv.y >> 1)); +#endif + + src = &previous[(x + (mv.x >> 1)) + (y + (mv.y >> 1))*pitch]; + dst = current; + + s->dsp.put_pixels_tab[0][((mv.y & 1) << 1) | (mv.x & 1)](dst,src,pitch,16); + + return 0; +} + +static int svq1_motion_inter_4v_block (MpegEncContext *s, GetBitContext *bitbuf, + uint8_t *current, uint8_t *previous, int pitch, + svq1_pmv_t *motion,int x, int y) { + uint8_t *src; + uint8_t *dst; + svq1_pmv_t mv; + svq1_pmv_t *pmv[4]; + int i, result; + + /* predict and decode motion vector (0) */ + pmv[0] = &motion[0]; + if (y == 0) { + pmv[1] = + pmv[2] = pmv[0]; + } + else { + pmv[1] = &motion[(x / 8) + 2]; + pmv[2] = &motion[(x / 8) + 4]; + } + + result = svq1_decode_motion_vector (bitbuf, &mv, pmv); + + if (result != 0) + return result; + + /* predict and decode motion vector (1) */ + pmv[0] = &mv; + if (y == 0) { + pmv[1] = + pmv[2] = pmv[0]; + } + else { + pmv[1] = &motion[(x / 8) + 3]; + } + result = svq1_decode_motion_vector (bitbuf, &motion[0], pmv); + + if (result != 0) + return result; + + /* predict and decode motion vector (2) */ + pmv[1] = &motion[0]; + pmv[2] = &motion[(x / 8) + 1]; + + result = svq1_decode_motion_vector (bitbuf, &motion[(x / 8) + 2], pmv); + + if (result != 0) + return result; + + /* predict and decode motion vector (3) */ + pmv[2] = &motion[(x / 8) + 2]; + pmv[3] = &motion[(x / 8) + 3]; + + result = svq1_decode_motion_vector (bitbuf, pmv[3], pmv); + + if (result != 0) + return result; + + /* form predictions */ + for (i=0; i < 4; i++) { + int mvx= pmv[i]->x + (i&1)*16; + int mvy= pmv[i]->y + (i>>1)*16; + + ///XXX /FIXME cliping or padding? + if(y + (mvy >> 1)<0) + mvy= 0; + if(x + (mvx >> 1)<0) + mvx= 0; + +#if 0 + int w= (s->width+15)&~15; + int h= (s->height+15)&~15; + if(x + (mvx >> 1)<0 || y + (mvy >> 1)<0 || x + (mvx >> 1) + 8 > w || y + (mvy >> 1) + 8> h) + printf("%d %d %d %d\n", x, y, x + (mvx >> 1), y + (mvy >> 1)); +#endif + src = &previous[(x + (mvx >> 1)) + (y + (mvy >> 1))*pitch]; + dst = current; + + s->dsp.put_pixels_tab[1][((mvy & 1) << 1) | (mvx & 1)](dst,src,pitch,8); + + /* select next block */ + if (i & 1) { + current += 8*(pitch - 1); + } else { + current += 8; + } + } + + return 0; +} + +static int svq1_decode_delta_block (MpegEncContext *s, GetBitContext *bitbuf, + uint8_t *current, uint8_t *previous, int pitch, + svq1_pmv_t *motion, int x, int y) { + uint32_t block_type; + int result = 0; + + /* get block type */ + block_type = get_vlc2(bitbuf, svq1_block_type.table, 2, 2); + + /* reset motion vectors */ + if (block_type == SVQ1_BLOCK_SKIP || block_type == SVQ1_BLOCK_INTRA) { + motion[0].x = + motion[0].y = + motion[(x / 8) + 2].x = + motion[(x / 8) + 2].y = + motion[(x / 8) + 3].x = + motion[(x / 8) + 3].y = 0; + } + + switch (block_type) { + case SVQ1_BLOCK_SKIP: + svq1_skip_block (current, previous, pitch, x, y); + break; + + case SVQ1_BLOCK_INTER: + result = svq1_motion_inter_block (s, bitbuf, current, previous, pitch, motion, x, y); + + if (result != 0) + { +#ifdef DEBUG_SVQ1 + printf("Error in svq1_motion_inter_block %i\n",result); +#endif + break; + } + result = svq1_decode_block_non_intra (bitbuf, current, pitch); + break; + + case SVQ1_BLOCK_INTER_4V: + result = svq1_motion_inter_4v_block (s, bitbuf, current, previous, pitch, motion, x, y); + + if (result != 0) + { +#ifdef DEBUG_SVQ1 + printf("Error in svq1_motion_inter_4v_block %i\n",result); +#endif + break; + } + result = svq1_decode_block_non_intra (bitbuf, current, pitch); + break; + + case SVQ1_BLOCK_INTRA: + result = svq1_decode_block_intra (bitbuf, current, pitch); + break; + } + + return result; +} + +/* standard video sizes */ +static struct { int width; int height; } svq1_frame_size_table[8] = { + { 160, 120 }, { 128, 96 }, { 176, 144 }, { 352, 288 }, + { 704, 576 }, { 240, 180 }, { 320, 240 }, { -1, -1 } +}; + +static uint16_t svq1_packet_checksum (uint8_t *data, int length, int value) { + int i; + + for (i=0; i < length; i++) { + value = checksum_table[data[i] ^ (value >> 8)] ^ ((value & 0xFF) << 8); + } + + return value; +} + +static uint16_t svq1_component_checksum (uint16_t *pixels, int pitch, + int width, int height, int value) { + int x, y; + + for (y=0; y < height; y++) { + for (x=0; x < width; x++) { + value = checksum_table[pixels[x] ^ (value >> 8)] ^ ((value & 0xFF) << 8); + } + + pixels += pitch; + } + + return value; +} + +static void svq1_parse_string (GetBitContext *bitbuf, uint8_t *out) { + uint8_t seed; + int i; + + out[0] = get_bits (bitbuf, 8); + + seed = string_table[out[0]]; + + for (i=1; i < out[0]; i++) { + out[i] = get_bits (bitbuf, 8) ^ seed; + seed = string_table[out[i] ^ seed]; + } +} + +static int svq1_decode_frame_header (GetBitContext *bitbuf,MpegEncContext *s) { + int frame_size_code; + int temporal_reference; + + temporal_reference = get_bits (bitbuf, 8); + + /* frame type */ + s->pict_type= get_bits (bitbuf, 2)+1; + if(s->pict_type==4) + return -1; + + if (s->pict_type == I_TYPE) { + + /* unknown fields */ + if (s->f_code == 0x50 || s->f_code == 0x60) { + int csum = get_bits (bitbuf, 16); + + csum = svq1_packet_checksum ((uint8_t *)bitbuf->buffer, bitbuf->size_in_bits>>3, csum); + +// printf ("%s checksum (%02x) for packet data\n", +// (csum == 0) ? "correct" : "incorrect", csum); + } + + if ((s->f_code ^ 0x10) >= 0x50) { + char msg[256]; + + svq1_parse_string (bitbuf, (char *) msg); + + printf ("embedded message: \"%s\"\n", (char *) msg); + } + + skip_bits (bitbuf, 2); + skip_bits (bitbuf, 2); + skip_bits1 (bitbuf); + + /* load frame size */ + frame_size_code = get_bits (bitbuf, 3); + + if (frame_size_code == 7) { + /* load width, height (12 bits each) */ + s->width = get_bits (bitbuf, 12); + s->height = get_bits (bitbuf, 12); + + if (!s->width || !s->height) + return -1; + } else { + /* get width, height from table */ + s->width = svq1_frame_size_table[frame_size_code].width; + s->height = svq1_frame_size_table[frame_size_code].height; + } + } + + /* unknown fields */ + if (get_bits (bitbuf, 1) == 1) { + skip_bits1 (bitbuf); /* use packet checksum if (1) */ + skip_bits1 (bitbuf); /* component checksums after image data if (1) */ + + if (get_bits (bitbuf, 2) != 0) + return -1; + } + + if (get_bits (bitbuf, 1) == 1) { + skip_bits1 (bitbuf); + skip_bits (bitbuf, 4); + skip_bits1 (bitbuf); + skip_bits (bitbuf, 2); + + while (get_bits (bitbuf, 1) == 1) { + skip_bits (bitbuf, 8); + } + } + + return 0; +} + +static int svq1_decode_frame(AVCodecContext *avctx, + void *data, int *data_size, + uint8_t *buf, int buf_size) +{ + MpegEncContext *s=avctx->priv_data; + uint8_t *current, *previous; + int result, i, x, y, width, height; + AVFrame *pict = data; + + /* initialize bit buffer */ + init_get_bits(&s->gb,buf,buf_size*8); + + /* decode frame header */ + s->f_code = get_bits (&s->gb, 22); + + if ((s->f_code & ~0x70) || !(s->f_code & 0x60)) + return -1; + + /* swap some header bytes (why?) */ + if (s->f_code != 0x20) { + uint32_t *src = (uint32_t *) (buf + 4); + + for (i=0; i < 4; i++) { + src[i] = ((src[i] << 16) | (src[i] >> 16)) ^ src[7 - i]; + } + } + + result = svq1_decode_frame_header (&s->gb, s); + + if (result != 0) + { +#ifdef DEBUG_SVQ1 + printf("Error in svq1_decode_frame_header %i\n",result); +#endif + return result; + } + + //FIXME this avoids some confusion for "B frames" without 2 references + //this should be removed after libavcodec can handle more flaxible picture types & ordering + if(s->pict_type==B_TYPE && s->last_picture_ptr==NULL) return buf_size; + + if(avctx->hurry_up && s->pict_type==B_TYPE) return buf_size; + + if(MPV_frame_start(s, avctx) < 0) + return -1; + + /* decode y, u and v components */ + for (i=0; i < 3; i++) { + int linesize; + if (i == 0) { + width = (s->width+15)&~15; + height = (s->height+15)&~15; + linesize= s->linesize; + } else { + if(s->flags&CODEC_FLAG_GRAY) break; + width = (s->width/4+15)&~15; + height = (s->height/4+15)&~15; + linesize= s->uvlinesize; + } + + current = s->current_picture.data[i]; + + if(s->pict_type==B_TYPE){ + previous = s->next_picture.data[i]; + }else{ + previous = s->last_picture.data[i]; + } + + if (s->pict_type == I_TYPE) { + /* keyframe */ + for (y=0; y < height; y+=16) { + for (x=0; x < width; x+=16) { + result = svq1_decode_block_intra (&s->gb, ¤t[x], linesize); + if (result != 0) + { +#ifdef DEBUG_SVQ1 + printf("Error in svq1_decode_block %i (keyframe)\n",result); +#endif + return result; + } + } + current += 16*linesize; + } + } else { + svq1_pmv_t pmv[width/8+3]; + /* delta frame */ + memset (pmv, 0, ((width / 8) + 3) * sizeof(svq1_pmv_t)); + + for (y=0; y < height; y+=16) { + for (x=0; x < width; x+=16) { + result = svq1_decode_delta_block (s, &s->gb, ¤t[x], previous, + linesize, pmv, x, y); + if (result != 0) + { +#ifdef DEBUG_SVQ1 + printf("Error in svq1_decode_delta_block %i\n",result); +#endif + return result; + } + } + + pmv[0].x = + pmv[0].y = 0; + + current += 16*linesize; + } + } + } + + *pict = *(AVFrame*)&s->current_picture; + + + MPV_frame_end(s); + + *data_size=sizeof(AVFrame); + return buf_size; +} + +static int svq1_decode_init(AVCodecContext *avctx) +{ + MpegEncContext *s = avctx->priv_data; + int i; + + s->avctx = avctx; + s->width = (avctx->width+3)&~3; + s->height = (avctx->height+3)&~3; + s->codec_id= avctx->codec->id; + avctx->pix_fmt = PIX_FMT_YUV410P; + avctx->has_b_frames= 1; // not true, but DP frames and these behave like unidirectional b frames + s->flags= avctx->flags; + if (MPV_common_init(s) < 0) return -1; + + init_vlc(&svq1_block_type, 2, 4, + &svq1_block_type_vlc[0][1], 2, 1, + &svq1_block_type_vlc[0][0], 2, 1); + + init_vlc(&svq1_motion_component, 7, 65, + &svq1_motion_component_vlc[0][1], 4, 2, + &svq1_motion_component_vlc[0][0], 4, 2); + + for (i = 0; i < 6; i++) { + init_vlc(&svq1_intra_multistage[i], 3, 8, + &svq1_intra_multistage_vlc[i][0][1], 2, 1, + &svq1_intra_multistage_vlc[i][0][0], 2, 1); + init_vlc(&svq1_inter_multistage[i], 3, 8, + &svq1_inter_multistage_vlc[i][0][1], 2, 1, + &svq1_inter_multistage_vlc[i][0][0], 2, 1); + } + + init_vlc(&svq1_intra_mean, 8, 256, + &svq1_intra_mean_vlc[0][1], 4, 2, + &svq1_intra_mean_vlc[0][0], 4, 2); + + init_vlc(&svq1_inter_mean, 9, 512, + &svq1_inter_mean_vlc[0][1], 4, 2, + &svq1_inter_mean_vlc[0][0], 4, 2); + + return 0; +} + +static int svq1_decode_end(AVCodecContext *avctx) +{ + MpegEncContext *s = avctx->priv_data; + + MPV_common_end(s); + return 0; +} + +AVCodec svq1_decoder = { + "svq1", + CODEC_TYPE_VIDEO, + CODEC_ID_SVQ1, + sizeof(MpegEncContext), + svq1_decode_init, + NULL, + svq1_decode_end, + svq1_decode_frame, + CODEC_CAP_DR1, + .flush= ff_mpeg_flush, +};