/* * SVQ1 decoder * ported to MPlayer by Arpi * ported to libavcodec by Nick Kurshev * * Copyright (C) 2002 the xine project * Copyright (C) 2002 the ffmpeg project * * SVQ1 Encoder (c) 2004 Mike Melanson * * This file is part of FFmpeg. * * FFmpeg 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 2.1 of the License, or (at your option) any later version. * * FFmpeg 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 FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ /** * @file libavcodec/svq1.c * Sorenson Vector Quantizer #1 (SVQ1) video codec. * For more information of the SVQ1 algorithm, visit: * http://www.pcisys.net/~melanson/codecs/ */ //#define DEBUG_SVQ1 #include "avcodec.h" #include "dsputil.h" #include "mpegvideo.h" #include "mathops.h" #include "svq1.h" #undef NDEBUG #include extern const uint8_t mvtab[33][2]; 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; /* motion vector (prediction) */ typedef struct svq1_pmv_s { int x; int y; } svq1_pmv; 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_bits1 (bitbuf) == 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 av_log(s->avctx, AV_LOG_INFO, "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(ff_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 av_log(s->avctx, AV_LOG_INFO, "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(ff_svq1_inter_codebooks); SVQ1_DO_CODEBOOK_NONINTRA() } return 0; } static int svq1_decode_motion_vector (GetBitContext *bitbuf, svq1_pmv *mv, svq1_pmv **pmv) { int diff; int i; for (i=0; i < 2; i++) { /* get motion code */ diff = get_vlc2(bitbuf, svq1_motion_component.table, 7, 2); if(diff<0) return -1; else if(diff){ if(get_bits1(bitbuf)) diff= -diff; } /* add median of motion vector predictors and clip result */ if (i == 1) mv->y = ((diff + mid_pred(pmv[0]->y, pmv[1]->y, pmv[2]->y)) << 26) >> 26; else mv->x = ((diff + mid_pred(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 *motion, int x, int y) { uint8_t *src; uint8_t *dst; svq1_pmv mv; svq1_pmv *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) av_log(s->avctx, AV_LOG_INFO, "%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 *motion,int x, int y) { uint8_t *src; uint8_t *dst; svq1_pmv mv; svq1_pmv *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 clipping 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) av_log(s->avctx, AV_LOG_INFO, "%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 *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 av_log(s->avctx, AV_LOG_INFO, "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 av_log(s->avctx, AV_LOG_INFO, "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; } uint16_t ff_svq1_packet_checksum (const uint8_t *data, const 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 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 == FF_I_TYPE) { /* unknown fields */ if (s->f_code == 0x50 || s->f_code == 0x60) { int csum = get_bits (bitbuf, 16); csum = ff_svq1_packet_checksum (bitbuf->buffer, bitbuf->size_in_bits>>3, csum); // av_log(s->avctx, AV_LOG_INFO, "%s checksum (%02x) for packet data\n", // (csum == 0) ? "correct" : "incorrect", csum); } if ((s->f_code ^ 0x10) >= 0x50) { uint8_t msg[256]; svq1_parse_string (bitbuf, msg); av_log(s->avctx, AV_LOG_INFO, "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 = ff_svq1_frame_size_table[frame_size_code].width; s->height = ff_svq1_frame_size_table[frame_size_code].height; } } /* unknown fields */ if (get_bits1 (bitbuf) == 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_bits1 (bitbuf) == 1) { skip_bits1 (bitbuf); skip_bits (bitbuf, 4); skip_bits1 (bitbuf); skip_bits (bitbuf, 2); while (get_bits1 (bitbuf) == 1) { skip_bits (bitbuf, 8); } } return 0; } static int svq1_decode_frame(AVCodecContext *avctx, void *data, int *data_size, const 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 av_log(s->avctx, AV_LOG_INFO, "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 flexible picture types & ordering if(s->pict_type==FF_B_TYPE && s->last_picture_ptr==NULL) return buf_size; if(avctx->hurry_up && s->pict_type==FF_B_TYPE) return buf_size; if( (avctx->skip_frame >= AVDISCARD_NONREF && s->pict_type==FF_B_TYPE) ||(avctx->skip_frame >= AVDISCARD_NONKEY && s->pict_type!=FF_I_TYPE) || avctx->skip_frame >= AVDISCARD_ALL) 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==FF_B_TYPE){ previous = s->next_picture.data[i]; }else{ previous = s->last_picture.data[i]; } if (s->pict_type == FF_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 av_log(s->avctx, AV_LOG_INFO, "Error in svq1_decode_block %i (keyframe)\n",result); //#endif return result; } } current += 16*linesize; } } else { svq1_pmv pmv[width/8+3]; /* delta frame */ memset (pmv, 0, ((width / 8) + 3) * sizeof(svq1_pmv)); 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 av_log(s->avctx, AV_LOG_INFO, "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 av_cold int svq1_decode_init(AVCodecContext *avctx) { MpegEncContext *s = avctx->priv_data; int i; MPV_decode_defaults(s); 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, &ff_svq1_block_type_vlc[0][1], 2, 1, &ff_svq1_block_type_vlc[0][0], 2, 1, 1); init_vlc(&svq1_motion_component, 7, 33, &mvtab[0][1], 2, 1, &mvtab[0][0], 2, 1, 1); for (i = 0; i < 6; i++) { init_vlc(&svq1_intra_multistage[i], 3, 8, &ff_svq1_intra_multistage_vlc[i][0][1], 2, 1, &ff_svq1_intra_multistage_vlc[i][0][0], 2, 1, 1); init_vlc(&svq1_inter_multistage[i], 3, 8, &ff_svq1_inter_multistage_vlc[i][0][1], 2, 1, &ff_svq1_inter_multistage_vlc[i][0][0], 2, 1, 1); } init_vlc(&svq1_intra_mean, 8, 256, &ff_svq1_intra_mean_vlc[0][1], 4, 2, &ff_svq1_intra_mean_vlc[0][0], 4, 2, 1); init_vlc(&svq1_inter_mean, 9, 512, &ff_svq1_inter_mean_vlc[0][1], 4, 2, &ff_svq1_inter_mean_vlc[0][0], 4, 2, 1); return 0; } static av_cold 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, .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV410P, PIX_FMT_NONE}, .long_name= NULL_IF_CONFIG_SMALL("Sorenson Vector Quantizer 1"), };