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14aa9da3d6
FFmpeg/libavcodec/svq1.c
Michael Niedermayer 14aa9da3d6 color and 10l 
Originally committed as revision 3116 to svn://svn.ffmpeg.org/ffmpeg/trunk
2004-05-07 21:10:52 +00:00

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/*
*
* 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
*
* (SVQ1 Decoder)
* Ported to mplayer by Arpi <arpi@thot.banki.hu>
* Ported to libavcodec by Nick Kurshev <nickols_k@mail.ru>
*
* SVQ1 Encoder (c) 2004 Mike Melanson <melanson@pcisys.net>
*/
/**
* @file 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 <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <limits.h>
#include "common.h"
#include "avcodec.h"
#include "dsputil.h"
#include "mpegvideo.h"
#include "bswap.h"
#undef NDEBUG
#include <assert.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
typedef struct SVQ1Context {
AVCodecContext *avctx;
DSPContext dsp;
AVFrame picture;
PutBitContext pb;
GetBitContext gb;
PutBitContext reorder_pb[6]; //why ooh why this sick breadth first order, everything is slower and more complex
int frame_width;
int frame_height;
/* Y plane block dimensions */
int y_block_width;
int y_block_height;
/* U & V plane (C planes) block dimensions */
int c_block_width;
int c_block_height;
unsigned char *c_plane;
} SVQ1Context;
/* 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
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(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(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)
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_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)
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_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
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;
}
/* 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);
// 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) {
char msg[256];
svq1_parse_string (bitbuf, (char *) 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 = 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
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==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, &current[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_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, &current[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 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,
&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;
}
static void svq1_write_header(SVQ1Context *s, int frame_type)
{
/* frame code */
put_bits(&s->pb, 22, 0x20);
/* temporal reference (sure hope this is a "don't care") */
put_bits(&s->pb, 8, 0x00);
/* frame type */
put_bits(&s->pb, 2, frame_type - 1);
if (frame_type == I_TYPE) {
/* no checksum since frame code is 0x20 */
/* no embedded string either */
/* output 5 unknown bits (2 + 2 + 1) */
put_bits(&s->pb, 5, 0);
/* forget about matching up resolutions, just use the free-form
* resolution code (7) for now */
put_bits(&s->pb, 3, 7);
put_bits(&s->pb, 12, s->frame_width);
put_bits(&s->pb, 12, s->frame_height);
}
/* no checksum or extra data (next 2 bits get 0) */
put_bits(&s->pb, 2, 0);
}
int level_sizes[6] = { 8, 16, 32, 64, 128, 256 };
int level_log2_sizes[6] = { 3, 4, 5, 6, 7, 8 };
#define IABS(x) ((x < 0) ? (-(x)) : x)
//#define USE_MAD_ALGORITHM
#ifdef USE_MAD_ALGORITHM
#define QUALITY_THRESHOLD 100
#define THRESHOLD_MULTIPLIER 0.6
/* This function calculates vector differences using mean absolute
* difference (MAD). */
static int encode_vector(SVQ1Context *s, unsigned char *vector,
unsigned int level, int threshold)
{
int i, j, k;
int mean;
signed short work_vector[256];
int best_codebook;
int best_score;
int multistage_codebooks[6];
int number_of_stages = 0;
int8_t *current_codebook;
int total_deviation;
int ret;
#ifdef DEBUG_SVQ1
av_log(s->avctx, AV_LOG_INFO, " ** recursive entry point: encoding level %d vector at threshold %d\n",
level, threshold);
#endif
if (level > 5) {
av_log(s->avctx, AV_LOG_INFO, " help! level %d > 5\n", level);
return 0;
}
#ifdef DEBUG_SVQ1
for (i = 0; i < level_sizes[level]; i++)
av_log(s->avctx, AV_LOG_INFO, " %02X", vector[i]);
av_log(s->avctx, AV_LOG_INFO, "\n");
#endif
/* calculate the mean */
mean = 0;
for (i = 0; i < level_sizes[level]; i++)
mean += vector[i];
mean >>= level_log2_sizes[level];
#ifdef DEBUG_SVQ1
av_log(s->avctx, AV_LOG_INFO, " vector mean = 0x%02X\n", mean);
#endif
/* remove the mean from the vector */
total_deviation = 0;
for (i = 0; i < level_sizes[level]; i++) {
work_vector[i] = (signed short)vector[i] - mean;
total_deviation += IABS(work_vector[i]);
#ifdef DEBUG_SVQ1
av_log(s->avctx, AV_LOG_INFO, " %d", work_vector[i]);
#endif
}
#ifdef DEBUG_SVQ1
av_log(s->avctx, AV_LOG_INFO, "\n total deviation = %d\n", total_deviation);
#endif
if (total_deviation < threshold) {
#ifdef DEBUG_SVQ1
av_log(s->avctx, AV_LOG_INFO, " mean-only encoding found for level %d vector, mean = %d\n",
level, mean);
#endif
/* indicate that this is the end of the subdivisions */
if (level > 0)
put_bits(&s->pb, 1, 0);
/* index 1 in the table indicates mean-only encoding */
put_bits(&s->pb, svq1_intra_multistage_vlc[level][1][1],
svq1_intra_multistage_vlc[level][1][0]);
put_bits(&s->pb, svq1_intra_mean_vlc[mean][1],
svq1_intra_mean_vlc[mean][0]);
#ifdef DEBUG_SVQ1
av_log(s->avctx, AV_LOG_INFO, " mean-only L%d, VLC = (0x%X, %d), mean = %d (0x%X, %d)\n",
level,
svq1_intra_multistage_vlc[level][1 + number_of_stages][0],
svq1_intra_multistage_vlc[level][1 + number_of_stages][1],
mean,
svq1_intra_mean_vlc[mean][0],
svq1_intra_mean_vlc[mean][1]);
#endif
ret = 0;
} else {
if (level <= 3) {
#ifdef DEBUG_SVQ1
av_log(s->avctx, AV_LOG_INFO, " multistage VQ search...\n");
#endif
/* conduct multistage VQ search, for each stage... */
for (i = 0; i < 6; i++) {
best_codebook = 0;
best_score = 0x7FFFFFFF;
/* for each codebook in stage */
for (j = 0; j < 16; j++) {
total_deviation = 0;
current_codebook =
&svq1_intra_codebooks[level]
[i * level_sizes[level] * 16 + j * level_sizes[level]];
/* calculate the total deviation for the vector */
for (k = 0; k < level_sizes[level]; k++) {
total_deviation +=
IABS(work_vector[k] - current_codebook[k]);
}
/* lowest score so far? */
if (total_deviation < best_score) {
best_score = total_deviation;
best_codebook = j;
}
#ifdef DEBUG_SVQ1
av_log(s->avctx, AV_LOG_INFO, " after %d, %d, best codebook is %d with a score of %d (score was %d)\n",
i, j, best_codebook, best_score, total_deviation);
#endif
}
/* apply the winning codebook to the work vector and check if
* the vector meets the quality threshold */
total_deviation = 0;
current_codebook =
&svq1_intra_codebooks[level]
[i * level_sizes[level] * 16 + j * level_sizes[level]];
multistage_codebooks[number_of_stages++] = best_codebook;
for (j = 0; j < level_sizes[level]; j++) {
work_vector[j] = work_vector[j] - current_codebook[j];
total_deviation += IABS(work_vector[j]);
}
/* do not go forward with the rest of the search if an acceptable
* codebook combination has been found */
if (total_deviation < threshold)
break;
}
}
if ((total_deviation < threshold) || (level == 0)) {
#ifdef DEBUG_SVQ1
av_log(s->avctx, AV_LOG_INFO, " level %d VQ encoding found using mean %d and codebooks", level, mean);
for (i = 0; i < number_of_stages; i++)
av_log(s->avctx, AV_LOG_INFO, " %d", multistage_codebooks[i]);
av_log(s->avctx, AV_LOG_INFO, "\n");
#endif
/* indicate that this is the end of the subdivisions */
if (level > 0)
put_bits(&s->pb, 1, 0);
/* output the encoding */
put_bits(&s->pb,
svq1_intra_multistage_vlc[level][1 + number_of_stages][1],
svq1_intra_multistage_vlc[level][1 + number_of_stages][0]);
put_bits(&s->pb, svq1_intra_mean_vlc[mean][1],
svq1_intra_mean_vlc[mean][0]);
#ifdef DEBUG_SVQ1
av_log(s->avctx, AV_LOG_INFO, " L%d: multistage = %d (0x%X, %d), mean = %d (0x%X, %d), codebooks = ",
level,
number_of_stages,
svq1_intra_multistage_vlc[level][1 + number_of_stages][0],
svq1_intra_multistage_vlc[level][1 + number_of_stages][1],
mean,
svq1_intra_mean_vlc[mean][0],
svq1_intra_mean_vlc[mean][1]);
#endif
for (i = 0; i < number_of_stages; i++)
{
#ifdef DEBUG_SVQ1
av_log(s->avctx, AV_LOG_INFO, "%d ", multistage_codebooks[i]);
#endif
put_bits(&s->pb, 4, multistage_codebooks[i]);
}
#ifdef DEBUG_SVQ1
av_log(s->avctx, AV_LOG_INFO, "\n");
#endif
ret = 0;
} else {
/* output a subdivision bit to the encoded stream and signal to
* the calling function that this vector could not be
* coded at the requested threshold and needs to be subdivided */
put_bits(&s->pb, 1, 1);
ret = 1;
}
}
return ret;
}
#else
#define QUALITY_THRESHOLD 100
#define THRESHOLD_MULTIPLIER 0.6
/* This function calculates vector differences using mean square
* error (MSE). */
static int encode_vector(SVQ1Context *s, unsigned char *vector,
unsigned int level, int threshold)
{
int i, j, k;
int mean;
signed short work_vector[256];
int best_codebook;
int best_score;
int multistage_codebooks[6];
int number_of_stages = 0;
int8_t *current_codebook;
int mse;
int diff;
int ret;
#ifdef DEBUG_SVQ1
av_log(s->avctx, AV_LOG_INFO, " ** recursive entry point: encoding level %d vector at threshold %d\n",
level, threshold);
#endif
if (level > 5) {
av_log(s->avctx, AV_LOG_INFO, " help! level %d > 5\n", level);
return 0;
}
#ifdef DEBUG_SVQ1
for (i = 0; i < level_sizes[level]; i++)
av_log(s->avctx, AV_LOG_INFO, " %02X", vector[i]);
av_log(s->avctx, AV_LOG_INFO, "\n");
#endif
/* calculate the mean */
mean = 0;
for (i = 0; i < level_sizes[level]; i++)
mean += vector[i];
mean >>= level_log2_sizes[level];
#ifdef DEBUG_SVQ1
av_log(s->avctx, AV_LOG_INFO, " vector mean = 0x%02X\n", mean);
#endif
/* remove the mean from the vector and compute the resulting MSE */
mse = 0;
for (i = 0; i < level_sizes[level]; i++) {
work_vector[i] = (signed short)vector[i] - mean;
mse += (work_vector[i] * work_vector[i]);
#ifdef DEBUG_SVQ1
av_log(s->avctx, AV_LOG_INFO, " %d", work_vector[i]);
#endif
}
mse >>= level_log2_sizes[level];
#ifdef DEBUG_SVQ1
av_log(s->avctx, AV_LOG_INFO, "\n MSE = %d\n", mse);
#endif
if (mse < threshold) {
#ifdef DEBUG_SVQ1
av_log(s->avctx, AV_LOG_INFO, " mean-only encoding found for level %d vector, mean = %d\n",
level, mean);
#endif
/* indicate that this is the end of the subdivisions */
if (level > 0)
put_bits(&s->pb, 1, 0);
/* index 1 in the table indicates mean-only encoding */
put_bits(&s->pb, svq1_intra_multistage_vlc[level][1][1],
svq1_intra_multistage_vlc[level][1][0]);
put_bits(&s->pb, svq1_intra_mean_vlc[mean][1],
svq1_intra_mean_vlc[mean][0]);
#ifdef DEBUG_SVQ1
av_log(s->avctx, AV_LOG_INFO, " mean-only L%d, VLC = (0x%X, %d), mean = %d (0x%X, %d)\n",
level,
svq1_intra_multistage_vlc[level][1 + number_of_stages][0],
svq1_intra_multistage_vlc[level][1 + number_of_stages][1],
mean,
svq1_intra_mean_vlc[mean][0],
svq1_intra_mean_vlc[mean][1]);
#endif
ret = 0;
} else {
if (level <= 3) {
#ifdef DEBUG_SVQ1
av_log(s->avctx, AV_LOG_INFO, " multistage VQ search...\n");
#endif
/* conduct multistage VQ search, for each stage... */
for (i = 0; i < 6; i++) {
best_codebook = 0;
best_score = 0x7FFFFFFF;
/* for each codebook in stage */
for (j = 0; j < 16; j++) {
mse = 0;
current_codebook =
&svq1_intra_codebooks[level]
[i * level_sizes[level] * 16 + j * level_sizes[level]];
/* calculate the MSE for this vector */
for (k = 0; k < level_sizes[level]; k++) {
diff = work_vector[k] - current_codebook[k];
mse += (diff * diff);
}
mse >>= level_log2_sizes[level];
/* lowest score so far? */
if (mse < best_score) {
best_score = mse;
best_codebook = j;
}
#ifdef DEBUG_SVQ1
av_log(s->avctx, AV_LOG_INFO, " after %d, %d, best codebook is %d with a score of %d (score was %d)\n",
i, j, best_codebook, best_score, mse);
#endif
}
/* apply the winning codebook to the work vector and check if
* the vector meets the quality threshold */
mse = 0;
current_codebook =
&svq1_intra_codebooks[level]
[i * level_sizes[level] * 16 + j * level_sizes[level]];
multistage_codebooks[number_of_stages++] = best_codebook;
for (j = 0; j < level_sizes[level]; j++) {
work_vector[j] = work_vector[j] - current_codebook[j];
mse += (work_vector[j] * work_vector[j]);
}
mse >>= level_log2_sizes[level];
/* do not go forward with the rest of the search if an acceptable
* codebook combination has been found */
if (mse < threshold)
break;
}
}
if ((mse < threshold) || (level == 0)) {
#ifdef DEBUG_SVQ1
av_log(s->avctx, AV_LOG_INFO, " level %d VQ encoding found using mean %d and codebooks", level, mean);
for (i = 0; i < number_of_stages; i++)
av_log(s->avctx, AV_LOG_INFO, " %d", multistage_codebooks[i]);
av_log(s->avctx, AV_LOG_INFO, "\n");
#endif
/* indicate that this is the end of the subdivisions */
if (level > 0)
put_bits(&s->pb, 1, 0);
/* output the encoding */
put_bits(&s->pb,
svq1_intra_multistage_vlc[level][1 + number_of_stages][1],
svq1_intra_multistage_vlc[level][1 + number_of_stages][0]);
put_bits(&s->pb, svq1_intra_mean_vlc[mean][1],
svq1_intra_mean_vlc[mean][0]);
#ifdef DEBUG_SVQ1
av_log(s->avctx, AV_LOG_INFO, " L%d: multistage = %d (0x%X, %d), mean = %d (0x%X, %d), codebooks = ",
level,
number_of_stages,
svq1_intra_multistage_vlc[level][1 + number_of_stages][0],
svq1_intra_multistage_vlc[level][1 + number_of_stages][1],
mean,
svq1_intra_mean_vlc[mean][0],
svq1_intra_mean_vlc[mean][1]);
#endif
for (i = 0; i < number_of_stages; i++)
{
#ifdef DEBUG_SVQ1
av_log(s->avctx, AV_LOG_INFO, "%d ", multistage_codebooks[i]);
#endif
put_bits(&s->pb, 4, multistage_codebooks[i]);
}
#ifdef DEBUG_SVQ1
av_log(s->avctx, AV_LOG_INFO, "\n");
#endif
ret = 0;
} else {
/* output a subdivision bit to the encoded stream and signal to
* the calling function that this vector could not be
* coded at the requested threshold and needs to be subdivided */
put_bits(&s->pb, 1, 1);
ret = 1;
}
}
return ret;
}
#endif
static int encode_block(SVQ1Context *s, uint8_t *src, int stride, int level, int threshold, int lambda){
int count, y, x, i, j, split, best_mean, best_score, best_count;
int best_vector[6];
int block_sum[7]= {0, 0, 0, 0, 0, 0};
int w= 2<<((level+2)>>1);
int h= 2<<((level+1)>>1);
int size=w*h;
int16_t block[7][256];
best_score=0;
for(y=0; y<h; y++){
for(x=0; x<w; x++){
int v= src[x + y*stride];
block[0][x + w*y]= v;
best_score += v*v;
block_sum[0] += v;
}
}
best_count=0;
best_score -= ((block_sum[0]*block_sum[0])>>(level+3));
best_mean= (block_sum[0] + (size>>1)) >> (level+3);
if(level<4){
for(count=1; count<7; count++){
int best_vector_score= INT_MAX;
int best_vector_sum=-99, best_vector_mean=-99;
const int stage= count-1;
int8_t *vector;
for(i=0; i<16; i++){
int sum=0;
int sqr=0;
int diff, mean, score;
vector = svq1_intra_codebooks[level] + stage*size*16 + i*size;
for(j=0; j<size; j++){
int v= vector[j];
sum += v;
sqr += (v - block[stage][j])*(v - block[stage][j]);
}
diff= block_sum[stage] - sum;
mean= (diff + (size>>1)) >> (level+3);
assert(mean >-50 && mean<300);
mean= clip(mean, 0, 255);
score= sqr - ((diff*(int64_t)diff)>>(level+3)); //FIXME 64bit slooow
if(score < best_vector_score){
best_vector_score= score;
best_vector[stage]= i;
best_vector_sum= sum;
best_vector_mean= mean;
}
}
assert(best_vector_mean != -99);
vector= svq1_intra_codebooks[level] + stage*size*16 + best_vector[stage]*size;
for(j=0; j<size; j++){
block[stage+1][j] = block[stage][j] - vector[j];
}
block_sum[stage+1]= block_sum[stage] - best_vector_sum;
best_vector_score +=
lambda*(+ 1 + 4*count
+ svq1_intra_multistage_vlc[level][1+count][1]
+ svq1_intra_mean_vlc[best_vector_mean][1]);
if(best_vector_score < best_score){
best_score= best_vector_score;
best_count= count;
best_mean= best_vector_mean;
}
}
}
split=0;
if(best_score > threshold && level){
int score=0;
int offset= (level&1) ? stride*h/2 : w/2;
PutBitContext backup[6];
for(i=level-1; i>=0; i--){
backup[i]= s->reorder_pb[i];
}
score += encode_block(s, src , stride, level-1, threshold>>1, lambda);
score += encode_block(s, src + offset, stride, level-1, threshold>>1, lambda);
score += lambda;
if(score < best_score){
best_score= score;
split=1;
}else{
for(i=level-1; i>=0; i--){
s->reorder_pb[i]= backup[i];
}
}
}
if (level > 0)
put_bits(&s->reorder_pb[level], 1, split);
if(!split){
assert(best_mean >= 0 && best_mean<256);
assert(best_count >=0 && best_count<7);
assert(level<4 || best_count==0);
/* output the encoding */
put_bits(&s->reorder_pb[level],
svq1_intra_multistage_vlc[level][1 + best_count][1],
svq1_intra_multistage_vlc[level][1 + best_count][0]);
put_bits(&s->reorder_pb[level], svq1_intra_mean_vlc[best_mean][1],
svq1_intra_mean_vlc[best_mean][0]);
for (i = 0; i < best_count; i++){
assert(best_vector[i]>=0 && best_vector[i]<16);
put_bits(&s->reorder_pb[level], 4, best_vector[i]);
}
}
return best_score;
}
static void svq1_encode_plane(SVQ1Context *s, unsigned char *plane,
int width, int height, int stride)
{
unsigned char buffer0[256];
unsigned char buffer1[256];
int current_buffer;
unsigned char *vector;
unsigned char *subvectors;
int vector_count;
int subvector_count;
int x, y;
int i, j;
int block_width, block_height;
int left_edge;
int level;
int threshold[6];
static int frame = 0;
#ifdef DEBUG_SVQ1
av_log(s->avctx, AV_LOG_INFO, "********* frame #%d\n", frame++);
#endif
/* figure out the acceptable level thresholds in advance */
threshold[5] = QUALITY_THRESHOLD;
for (level = 4; level >= 0; level--)
threshold[level] = threshold[level + 1] * THRESHOLD_MULTIPLIER;
block_width = (width + 15) / 16;
block_height = (height + 15) / 16;
for (y = 0; y < block_height; y++) {
for (x = 0; x < block_width; x++) {
uint8_t reorder_buffer[6][7*32];
#ifdef DEBUG_SVQ1
av_log(s->avctx, AV_LOG_INFO, "* level 5 vector @ %d, %d:\n", x * 16, y * 16);
#endif
/* copy the block into the current work buffer */
left_edge = (y * 16 * stride) + (x * 16);
for(i=0; i<6; i++){
init_put_bits(&s->reorder_pb[i], reorder_buffer[i], 7*32);
}
encode_block(s, &plane[left_edge], stride, 5, 256, (s->picture.quality*s->picture.quality) >> (2*FF_LAMBDA_SHIFT));
for(i=5; i>=0; i--){
int count= put_bits_count(&s->reorder_pb[i]);
flush_put_bits(&s->reorder_pb[i]);
ff_copy_bits(&s->pb, s->reorder_pb[i].buf, count);
}
#if 0
for (i = 0; i < 256; i += 16) {
memcpy(&buffer0[i], &plane[left_edge], 16);
left_edge += stride;
}
current_buffer = 1; /* this will toggle to 0 immediately */
/* perform a breadth-first tree encoding for each vector level */
subvector_count = 1; /* one subvector at level 5 */
for (level = 5; level >= 0; level--) {
vector_count = subvector_count;
subvector_count = 0;
if (current_buffer == 0) {
current_buffer = 1;
vector = buffer1;
subvectors = buffer0;
} else {
current_buffer = 0;
vector = buffer0;
subvectors = buffer1;
}
/* iterate through each vector in the list */
for (i = 0; i < vector_count; i++) {
if (encode_vector(s, vector, level, threshold[level])) {
#ifdef DEBUG_SVQ1
av_log(s->avctx, AV_LOG_INFO, " split to level %d\n", level - 1);
#endif
/* subdivide into 2 subvectors for later processing */
subvector_count += 2;
if (level - 1 == 3) {
/* subdivide 16x8 -> 2 8x8 */
for (j = 0; j < 8; j++) {
/* left half */
memcpy(subvectors + j * 8, vector + j * 16, 8);
/* right half */
memcpy(subvectors + 64 + j * 8,
vector + 8 + j * 16, 8);
}
subvectors += 128;
} else if (level - 1 == 1) {
/* subdivide 8x4 -> 2 4x4 */
for (j = 0; j < 4; j++) {
/* left half */
memcpy(subvectors + j * 4, vector + j * 8, 4);
/* right half */
memcpy(subvectors + 16 + j * 4,
vector + 4 + j * 8, 4);
}
subvectors += 32;
} else {
/* first half */
memcpy(subvectors, vector, level_sizes[level - 1]);
subvectors += level_sizes[level - 1];
/* second half */
memcpy(subvectors, vector + level_sizes[level - 1],
level_sizes[level - 1]);
subvectors += level_sizes[level - 1];
}
}
vector += level_sizes[level];
}
/* if there are no more subvectors, break early */
if (!subvector_count)
break;
}
#endif
}
}
}
/* output a plane with a constant mean value; good for debugging and for
* greyscale encoding but only valid for intra frames */
static void svq1_output_intra_constant_mean(SVQ1Context *s, int block_width,
int block_height, unsigned char mean)
{
int i;
/* for each level 5 vector, output the specified mean value */
for (i = 0; i < block_width * block_height; i++) {
/* output a 0 before each vector indicating no subdivision */
put_bits(&s->pb, 1, 0);
/* output a 0 indicating mean-only encoding; use index 1 as that
* maps to code 0 */
put_bits(&s->pb, svq1_intra_multistage_vlc[5][1][1],
svq1_intra_multistage_vlc[5][1][0]);
/* output a constant mean */
put_bits(&s->pb, svq1_intra_mean_vlc[mean][1],
svq1_intra_mean_vlc[mean][0]);
#ifdef DEBUG_SVQ1
av_log(s->avctx, AV_LOG_INFO, " const L5 %d/%d: multistage = 0 (0x%X, %d), mean = %d (0x%X, %d)\n",
i, block_width * block_height,
svq1_intra_multistage_vlc[5][1][0],
svq1_intra_multistage_vlc[5][1][1],
mean,
svq1_intra_mean_vlc[mean][0],
svq1_intra_mean_vlc[mean][1]);
#endif
}
}
static int svq1_encode_init(AVCodecContext *avctx)
{
SVQ1Context * const s = avctx->priv_data;
int i;
unsigned char least_bits_value = 0;
int least_bits;
dsputil_init(&s->dsp, avctx);
avctx->coded_frame= (AVFrame*)&s->picture;
s->frame_width = avctx->width;
s->frame_height = avctx->height;
s->y_block_width = (s->frame_width + 15) / 16;
s->y_block_height = (s->frame_height + 15) / 16;
s->c_block_width = (s->frame_width / 4 + 15) / 16;
s->c_block_height = (s->frame_height / 4 + 15) / 16;
av_log(s->avctx, AV_LOG_INFO, " Hey: %d x %d, %d x %d, %d x %d\n",
s->frame_width, s->frame_height,
s->y_block_width, s->y_block_height,
s->c_block_width, s->c_block_height);
/* allocate a plane for the U & V planes (color, or C, planes) and
* initialize them to the value that is represented by the fewest bits
* in the mean table; the reasoning behind this is that when the border
* vectors are operated upon and possibly subdivided, the mean will be
* removed resulting in a perfect deviation score of 0 and encoded with
* the minimal possible bits */
s->c_plane = av_malloc(s->c_block_width * s->c_block_height * 16 * 16);
least_bits = 10000;
for (i = 0; i < 256; i++)
if (svq1_intra_mean_vlc[i][1] < least_bits) {
least_bits = svq1_intra_mean_vlc[i][1];
least_bits_value = i;
}
memset(s->c_plane, least_bits_value,
s->c_block_width * s->c_block_height * 16 * 16);
return 0;
}
static int svq1_encode_frame(AVCodecContext *avctx, unsigned char *buf,
int buf_size, void *data)
{
SVQ1Context * const s = avctx->priv_data;
AVFrame *pict = data;
AVFrame * const p= (AVFrame*)&s->picture;
init_put_bits(&s->pb, buf, buf_size);
*p = *pict;
p->pict_type = I_TYPE;
p->key_frame = 1;
svq1_write_header(s, p->pict_type);
svq1_encode_plane(s, s->picture.data[0], s->frame_width, s->frame_height,
s->picture.linesize[0]);
// if (avctx->flags & CODEC_FLAG_GRAY) {
if (avctx->pix_fmt != PIX_FMT_YUV410P) {
svq1_output_intra_constant_mean(s, s->c_block_width * 2,
s->c_block_height * 2, 128);
} else {
svq1_encode_plane(s, s->picture.data[1], s->frame_width / 4,
s->frame_height / 4, s->picture.linesize[1]);
svq1_encode_plane(s, s->picture.data[2], s->frame_width / 4,
s->frame_height / 4, s->picture.linesize[2]);
}
// align_put_bits(&s->pb);
while(put_bits_count(&s->pb) & 31)
put_bits(&s->pb, 1, 0);
flush_put_bits(&s->pb);
return (put_bits_count(&s->pb) / 8);
}
static int svq1_encode_end(AVCodecContext *avctx)
{
SVQ1Context * const s = avctx->priv_data;
av_free(s->c_plane);
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,
};
#ifdef CONFIG_ENCODERS
AVCodec svq1_encoder = {
"svq1",
CODEC_TYPE_VIDEO,
CODEC_ID_SVQ1,
sizeof(SVQ1Context),
svq1_encode_init,
svq1_encode_frame,
svq1_encode_end,
};
#endif //CONFIG_ENCODERS
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