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ffmpeg/libavcodec/4xm.c
Michael Niedermayer 013291501f Allocate last picture for 4xm pfrm if its not allocated. 
Fixes segfault and issue2527

Originally committed as revision 26397 to svn://svn.ffmpeg.org/ffmpeg/trunk
2011-01-16 22:08:34 +00:00

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/*
* 4XM codec
* Copyright (c) 2003 Michael Niedermayer
*
* 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
* 4XM codec.
*/
#include "libavutil/intreadwrite.h"
#include "avcodec.h"
#include "dsputil.h"
#include "get_bits.h"
#include "bytestream.h"
//#undef NDEBUG
//#include <assert.h>
#define BLOCK_TYPE_VLC_BITS 5
#define ACDC_VLC_BITS 9
#define CFRAME_BUFFER_COUNT 100
static const uint8_t block_type_tab[2][4][8][2]={
{
{ //{8,4,2}x{8,4,2}
{ 0,1}, { 2,2}, { 6,3}, {14,4}, {30,5}, {31,5}, { 0,0}
},{ //{8,4}x1
{ 0,1}, { 0,0}, { 2,2}, { 6,3}, {14,4}, {15,4}, { 0,0}
},{ //1x{8,4}
{ 0,1}, { 2,2}, { 0,0}, { 6,3}, {14,4}, {15,4}, { 0,0}
},{ //1x2, 2x1
{ 0,1}, { 0,0}, { 0,0}, { 2,2}, { 6,3}, {14,4}, {15,4}
}
},{
{ //{8,4,2}x{8,4,2}
{ 1,2}, { 4,3}, { 5,3}, {0,2}, {6,3}, {7,3}, {0,0}
},{//{8,4}x1
{ 1,2}, { 0,0}, { 2,2}, {0,2}, {6,3}, {7,3}, {0,0}
},{//1x{8,4}
{ 1,2}, { 2,2}, { 0,0}, {0,2}, {6,3}, {7,3}, {0,0}
},{//1x2, 2x1
{ 1,2}, { 0,0}, { 0,0}, {0,2}, {2,2}, {6,3}, {7,3}
}
}
};
static const uint8_t size2index[4][4]={
{-1, 3, 1, 1},
{ 3, 0, 0, 0},
{ 2, 0, 0, 0},
{ 2, 0, 0, 0},
};
static const int8_t mv[256][2]={
{ 0, 0},{ 0, -1},{ -1, 0},{ 1, 0},{ 0, 1},{ -1, -1},{ 1, -1},{ -1, 1},
{ 1, 1},{ 0, -2},{ -2, 0},{ 2, 0},{ 0, 2},{ -1, -2},{ 1, -2},{ -2, -1},
{ 2, -1},{ -2, 1},{ 2, 1},{ -1, 2},{ 1, 2},{ -2, -2},{ 2, -2},{ -2, 2},
{ 2, 2},{ 0, -3},{ -3, 0},{ 3, 0},{ 0, 3},{ -1, -3},{ 1, -3},{ -3, -1},
{ 3, -1},{ -3, 1},{ 3, 1},{ -1, 3},{ 1, 3},{ -2, -3},{ 2, -3},{ -3, -2},
{ 3, -2},{ -3, 2},{ 3, 2},{ -2, 3},{ 2, 3},{ 0, -4},{ -4, 0},{ 4, 0},
{ 0, 4},{ -1, -4},{ 1, -4},{ -4, -1},{ 4, -1},{ 4, 1},{ -1, 4},{ 1, 4},
{ -3, -3},{ -3, 3},{ 3, 3},{ -2, -4},{ -4, -2},{ 4, -2},{ -4, 2},{ -2, 4},
{ 2, 4},{ -3, -4},{ 3, -4},{ 4, -3},{ -5, 0},{ -4, 3},{ -3, 4},{ 3, 4},
{ -1, -5},{ -5, -1},{ -5, 1},{ -1, 5},{ -2, -5},{ 2, -5},{ 5, -2},{ 5, 2},
{ -4, -4},{ -4, 4},{ -3, -5},{ -5, -3},{ -5, 3},{ 3, 5},{ -6, 0},{ 0, 6},
{ -6, -1},{ -6, 1},{ 1, 6},{ 2, -6},{ -6, 2},{ 2, 6},{ -5, -4},{ 5, 4},
{ 4, 5},{ -6, -3},{ 6, 3},{ -7, 0},{ -1, -7},{ 5, -5},{ -7, 1},{ -1, 7},
{ 4, -6},{ 6, 4},{ -2, -7},{ -7, 2},{ -3, -7},{ 7, -3},{ 3, 7},{ 6, -5},
{ 0, -8},{ -1, -8},{ -7, -4},{ -8, 1},{ 4, 7},{ 2, -8},{ -2, 8},{ 6, 6},
{ -8, 3},{ 5, -7},{ -5, 7},{ 8, -4},{ 0, -9},{ -9, -1},{ 1, 9},{ 7, -6},
{ -7, 6},{ -5, -8},{ -5, 8},{ -9, 3},{ 9, -4},{ 7, -7},{ 8, -6},{ 6, 8},
{ 10, 1},{-10, 2},{ 9, -5},{ 10, -3},{ -8, -7},{-10, -4},{ 6, -9},{-11, 0},
{ 11, 1},{-11, -2},{ -2, 11},{ 7, -9},{ -7, 9},{ 10, 6},{ -4, 11},{ 8, -9},
{ 8, 9},{ 5, 11},{ 7,-10},{ 12, -3},{ 11, 6},{ -9, -9},{ 8, 10},{ 5, 12},
{-11, 7},{ 13, 2},{ 6,-12},{ 10, 9},{-11, 8},{ -7, 12},{ 0, 14},{ 14, -2},
{ -9, 11},{ -6, 13},{-14, -4},{ -5,-14},{ 5, 14},{-15, -1},{-14, -6},{ 3,-15},
{ 11,-11},{ -7, 14},{ -5, 15},{ 8,-14},{ 15, 6},{ 3, 16},{ 7,-15},{-16, 5},
{ 0, 17},{-16, -6},{-10, 14},{-16, 7},{ 12, 13},{-16, 8},{-17, 6},{-18, 3},
{ -7, 17},{ 15, 11},{ 16, 10},{ 2,-19},{ 3,-19},{-11,-16},{-18, 8},{-19, -6},
{ 2,-20},{-17,-11},{-10,-18},{ 8, 19},{-21, -1},{-20, 7},{ -4, 21},{ 21, 5},
{ 15, 16},{ 2,-22},{-10,-20},{-22, 5},{ 20,-11},{ -7,-22},{-12, 20},{ 23, -5},
{ 13,-20},{ 24, -2},{-15, 19},{-11, 22},{ 16, 19},{ 23,-10},{-18,-18},{ -9,-24},
{ 24,-10},{ -3, 26},{-23, 13},{-18,-20},{ 17, 21},{ -4, 27},{ 27, 6},{ 1,-28},
{-11, 26},{-17,-23},{ 7, 28},{ 11,-27},{ 29, 5},{-23,-19},{-28,-11},{-21, 22},
{-30, 7},{-17, 26},{-27, 16},{ 13, 29},{ 19,-26},{ 10,-31},{-14,-30},{ 20,-27},
{-29, 18},{-16,-31},{-28,-22},{ 21,-30},{-25, 28},{ 26,-29},{ 25,-32},{-32,-32}
};
// this is simply the scaled down elementwise product of the standard jpeg quantizer table and the AAN premul table
static const uint8_t dequant_table[64]={
16, 15, 13, 19, 24, 31, 28, 17,
17, 23, 25, 31, 36, 63, 45, 21,
18, 24, 27, 37, 52, 59, 49, 20,
16, 28, 34, 40, 60, 80, 51, 20,
18, 31, 48, 66, 68, 86, 56, 21,
19, 38, 56, 59, 64, 64, 48, 20,
27, 48, 55, 55, 56, 51, 35, 15,
20, 35, 34, 32, 31, 22, 15, 8,
};
static VLC block_type_vlc[2][4];
typedef struct CFrameBuffer{
unsigned int allocated_size;
unsigned int size;
int id;
uint8_t *data;
}CFrameBuffer;
typedef struct FourXContext{
AVCodecContext *avctx;
DSPContext dsp;
AVFrame current_picture, last_picture;
GetBitContext pre_gb; ///< ac/dc prefix
GetBitContext gb;
const uint8_t *bytestream;
const uint16_t *wordstream;
int mv[256];
VLC pre_vlc;
int last_dc;
DECLARE_ALIGNED(16, DCTELEM, block)[6][64];
void *bitstream_buffer;
unsigned int bitstream_buffer_size;
int version;
CFrameBuffer cfrm[CFRAME_BUFFER_COUNT];
} FourXContext;
#define FIX_1_082392200 70936
#define FIX_1_414213562 92682
#define FIX_1_847759065 121095
#define FIX_2_613125930 171254
#define MULTIPLY(var,const) (((var)*(const)) >> 16)
static void idct(DCTELEM block[64]){
int tmp0, tmp1, tmp2, tmp3, tmp4, tmp5, tmp6, tmp7;
int tmp10, tmp11, tmp12, tmp13;
int z5, z10, z11, z12, z13;
int i;
int temp[64];
for(i=0; i<8; i++){
tmp10 = block[8*0 + i] + block[8*4 + i];
tmp11 = block[8*0 + i] - block[8*4 + i];
tmp13 = block[8*2 + i] + block[8*6 + i];
tmp12 = MULTIPLY(block[8*2 + i] - block[8*6 + i], FIX_1_414213562) - tmp13;
tmp0 = tmp10 + tmp13;
tmp3 = tmp10 - tmp13;
tmp1 = tmp11 + tmp12;
tmp2 = tmp11 - tmp12;
z13 = block[8*5 + i] + block[8*3 + i];
z10 = block[8*5 + i] - block[8*3 + i];
z11 = block[8*1 + i] + block[8*7 + i];
z12 = block[8*1 + i] - block[8*7 + i];
tmp7 = z11 + z13;
tmp11 = MULTIPLY(z11 - z13, FIX_1_414213562);
z5 = MULTIPLY(z10 + z12, FIX_1_847759065);
tmp10 = MULTIPLY(z12, FIX_1_082392200) - z5;
tmp12 = MULTIPLY(z10, - FIX_2_613125930) + z5;
tmp6 = tmp12 - tmp7;
tmp5 = tmp11 - tmp6;
tmp4 = tmp10 + tmp5;
temp[8*0 + i] = tmp0 + tmp7;
temp[8*7 + i] = tmp0 - tmp7;
temp[8*1 + i] = tmp1 + tmp6;
temp[8*6 + i] = tmp1 - tmp6;
temp[8*2 + i] = tmp2 + tmp5;
temp[8*5 + i] = tmp2 - tmp5;
temp[8*4 + i] = tmp3 + tmp4;
temp[8*3 + i] = tmp3 - tmp4;
}
for(i=0; i<8*8; i+=8){
tmp10 = temp[0 + i] + temp[4 + i];
tmp11 = temp[0 + i] - temp[4 + i];
tmp13 = temp[2 + i] + temp[6 + i];
tmp12 = MULTIPLY(temp[2 + i] - temp[6 + i], FIX_1_414213562) - tmp13;
tmp0 = tmp10 + tmp13;
tmp3 = tmp10 - tmp13;
tmp1 = tmp11 + tmp12;
tmp2 = tmp11 - tmp12;
z13 = temp[5 + i] + temp[3 + i];
z10 = temp[5 + i] - temp[3 + i];
z11 = temp[1 + i] + temp[7 + i];
z12 = temp[1 + i] - temp[7 + i];
tmp7 = z11 + z13;
tmp11 = MULTIPLY(z11 - z13, FIX_1_414213562);
z5 = MULTIPLY(z10 + z12, FIX_1_847759065);
tmp10 = MULTIPLY(z12, FIX_1_082392200) - z5;
tmp12 = MULTIPLY(z10, - FIX_2_613125930) + z5;
tmp6 = tmp12 - tmp7;
tmp5 = tmp11 - tmp6;
tmp4 = tmp10 + tmp5;
block[0 + i] = (tmp0 + tmp7)>>6;
block[7 + i] = (tmp0 - tmp7)>>6;
block[1 + i] = (tmp1 + tmp6)>>6;
block[6 + i] = (tmp1 - tmp6)>>6;
block[2 + i] = (tmp2 + tmp5)>>6;
block[5 + i] = (tmp2 - tmp5)>>6;
block[4 + i] = (tmp3 + tmp4)>>6;
block[3 + i] = (tmp3 - tmp4)>>6;
}
}
static av_cold void init_vlcs(FourXContext *f){
static VLC_TYPE table[8][32][2];
int i;
for(i=0; i<8; i++){
block_type_vlc[0][i].table= table[i];
block_type_vlc[0][i].table_allocated= 32;
init_vlc(&block_type_vlc[0][i], BLOCK_TYPE_VLC_BITS, 7,
&block_type_tab[0][i][0][1], 2, 1,
&block_type_tab[0][i][0][0], 2, 1, INIT_VLC_USE_NEW_STATIC);
}
}
static void init_mv(FourXContext *f){
int i;
for(i=0; i<256; i++){
if(f->version>1)
f->mv[i] = mv[i][0] + mv[i][1] *f->current_picture.linesize[0]/2;
else
f->mv[i] = (i&15) - 8 + ((i>>4)-8)*f->current_picture.linesize[0]/2;
}
}
#if HAVE_BIGENDIAN
#define LE_CENTRIC_MUL(dst, src, scale, dc) \
{ \
unsigned tmpval = AV_RN32(src); \
tmpval = (tmpval << 16) | (tmpval >> 16); \
tmpval = tmpval * (scale) + (dc); \
tmpval = (tmpval << 16) | (tmpval >> 16); \
AV_WN32A(dst, tmpval); \
}
#else
#define LE_CENTRIC_MUL(dst, src, scale, dc) \
{ \
unsigned tmpval = AV_RN32(src) * (scale) + (dc); \
AV_WN32A(dst, tmpval); \
}
#endif
static inline void mcdc(uint16_t *dst, uint16_t *src, int log2w, int h, int stride, int scale, int dc){
int i;
dc*= 0x10001;
switch(log2w){
case 0:
for(i=0; i<h; i++){
dst[0] = scale*src[0] + dc;
if(scale) src += stride;
dst += stride;
}
break;
case 1:
for(i=0; i<h; i++){
LE_CENTRIC_MUL(dst, src, scale, dc);
if(scale) src += stride;
dst += stride;
}
break;
case 2:
for(i=0; i<h; i++){
LE_CENTRIC_MUL(dst, src, scale, dc);
LE_CENTRIC_MUL(dst + 2, src + 2, scale, dc);
if(scale) src += stride;
dst += stride;
}
break;
case 3:
for(i=0; i<h; i++){
LE_CENTRIC_MUL(dst, src, scale, dc);
LE_CENTRIC_MUL(dst + 2, src + 2, scale, dc);
LE_CENTRIC_MUL(dst + 4, src + 4, scale, dc);
LE_CENTRIC_MUL(dst + 6, src + 6, scale, dc);
if(scale) src += stride;
dst += stride;
}
break;
default: assert(0);
}
}
static void decode_p_block(FourXContext *f, uint16_t *dst, uint16_t *src, int log2w, int log2h, int stride){
const int index= size2index[log2h][log2w];
const int h= 1<<log2h;
int code= get_vlc2(&f->gb, block_type_vlc[1-(f->version>1)][index].table, BLOCK_TYPE_VLC_BITS, 1);
uint16_t *start= (uint16_t*)f->last_picture.data[0];
uint16_t *end= start + stride*(f->avctx->height-h+1) - (1<<log2w);
assert(code>=0 && code<=6);
if(code == 0){
src += f->mv[ *f->bytestream++ ];
if(start > src || src > end){
av_log(f->avctx, AV_LOG_ERROR, "mv out of pic\n");
return;
}
mcdc(dst, src, log2w, h, stride, 1, 0);
}else if(code == 1){
log2h--;
decode_p_block(f, dst , src , log2w, log2h, stride);
decode_p_block(f, dst + (stride<<log2h), src + (stride<<log2h), log2w, log2h, stride);
}else if(code == 2){
log2w--;
decode_p_block(f, dst , src , log2w, log2h, stride);
decode_p_block(f, dst + (1<<log2w), src + (1<<log2w), log2w, log2h, stride);
}else if(code == 3 && f->version<2){
mcdc(dst, src, log2w, h, stride, 1, 0);
}else if(code == 4){
src += f->mv[ *f->bytestream++ ];
if(start > src || src > end){
av_log(f->avctx, AV_LOG_ERROR, "mv out of pic\n");
return;
}
mcdc(dst, src, log2w, h, stride, 1, av_le2ne16(*f->wordstream++));
}else if(code == 5){
mcdc(dst, src, log2w, h, stride, 0, av_le2ne16(*f->wordstream++));
}else if(code == 6){
if(log2w){
dst[0] = av_le2ne16(*f->wordstream++);
dst[1] = av_le2ne16(*f->wordstream++);
}else{
dst[0 ] = av_le2ne16(*f->wordstream++);
dst[stride] = av_le2ne16(*f->wordstream++);
}
}
}
static int decode_p_frame(FourXContext *f, const uint8_t *buf, int length){
int x, y;
const int width= f->avctx->width;
const int height= f->avctx->height;
uint16_t *src= (uint16_t*)f->last_picture.data[0];
uint16_t *dst= (uint16_t*)f->current_picture.data[0];
const int stride= f->current_picture.linesize[0]>>1;
unsigned int bitstream_size, bytestream_size, wordstream_size, extra;
if(f->version>1){
extra=20;
bitstream_size= AV_RL32(buf+8);
wordstream_size= AV_RL32(buf+12);
bytestream_size= AV_RL32(buf+16);
}else{
extra=0;
bitstream_size = AV_RL16(buf-4);
wordstream_size= AV_RL16(buf-2);
bytestream_size= FFMAX(length - bitstream_size - wordstream_size, 0);
}
if(bitstream_size+ bytestream_size+ wordstream_size + extra != length
|| bitstream_size > (1<<26)
|| bytestream_size > (1<<26)
|| wordstream_size > (1<<26)
){
av_log(f->avctx, AV_LOG_ERROR, "lengths %d %d %d %d\n", bitstream_size, bytestream_size, wordstream_size,
bitstream_size+ bytestream_size+ wordstream_size - length);
return -1;
}
av_fast_malloc(&f->bitstream_buffer, &f->bitstream_buffer_size, bitstream_size + FF_INPUT_BUFFER_PADDING_SIZE);
if (!f->bitstream_buffer)
return AVERROR(ENOMEM);
f->dsp.bswap_buf(f->bitstream_buffer, (const uint32_t*)(buf + extra), bitstream_size/4);
init_get_bits(&f->gb, f->bitstream_buffer, 8*bitstream_size);
f->wordstream= (const uint16_t*)(buf + extra + bitstream_size);
f->bytestream= buf + extra + bitstream_size + wordstream_size;
init_mv(f);
for(y=0; y<height; y+=8){
for(x=0; x<width; x+=8){
decode_p_block(f, dst + x, src + x, 3, 3, stride);
}
src += 8*stride;
dst += 8*stride;
}
if( bitstream_size != (get_bits_count(&f->gb)+31)/32*4
|| (((const char*)f->wordstream - (const char*)buf + 2)&~2) != extra + bitstream_size + wordstream_size
|| (((const char*)f->bytestream - (const char*)buf + 3)&~3) != extra + bitstream_size + wordstream_size + bytestream_size)
av_log(f->avctx, AV_LOG_ERROR, " %d %td %td bytes left\n",
bitstream_size - (get_bits_count(&f->gb)+31)/32*4,
-(((const char*)f->bytestream - (const char*)buf + 3)&~3) + (extra + bitstream_size + wordstream_size + bytestream_size),
-(((const char*)f->wordstream - (const char*)buf + 2)&~2) + (extra + bitstream_size + wordstream_size)
);
return 0;
}
/**
* decode block and dequantize.
* Note this is almost identical to MJPEG.
*/
static int decode_i_block(FourXContext *f, DCTELEM *block){
int code, i, j, level, val;
/* DC coef */
val = get_vlc2(&f->pre_gb, f->pre_vlc.table, ACDC_VLC_BITS, 3);
if (val>>4){
av_log(f->avctx, AV_LOG_ERROR, "error dc run != 0\n");
}
if(val)
val = get_xbits(&f->gb, val);
val = val * dequant_table[0] + f->last_dc;
f->last_dc =
block[0] = val;
/* AC coefs */
i = 1;
for(;;) {
code = get_vlc2(&f->pre_gb, f->pre_vlc.table, ACDC_VLC_BITS, 3);
/* EOB */
if (code == 0)
break;
if (code == 0xf0) {
i += 16;
} else {
level = get_xbits(&f->gb, code & 0xf);
i += code >> 4;
if (i >= 64) {
av_log(f->avctx, AV_LOG_ERROR, "run %d oveflow\n", i);
return 0;
}
j= ff_zigzag_direct[i];
block[j] = level * dequant_table[j];
i++;
if (i >= 64)
break;
}
}
return 0;
}
static inline void idct_put(FourXContext *f, int x, int y){
DCTELEM (*block)[64]= f->block;
int stride= f->current_picture.linesize[0]>>1;
int i;
uint16_t *dst = ((uint16_t*)f->current_picture.data[0]) + y * stride + x;
for(i=0; i<4; i++){
block[i][0] += 0x80*8*8;
idct(block[i]);
}
if(!(f->avctx->flags&CODEC_FLAG_GRAY)){
for(i=4; i<6; i++) idct(block[i]);
}
/* Note transform is:
y= ( 1b + 4g + 2r)/14
cb=( 3b - 2g - 1r)/14
cr=(-1b - 4g + 5r)/14
*/
for(y=0; y<8; y++){
for(x=0; x<8; x++){
DCTELEM *temp= block[(x>>2) + 2*(y>>2)] + 2*(x&3) + 2*8*(y&3); //FIXME optimize
int cb= block[4][x + 8*y];
int cr= block[5][x + 8*y];
int cg= (cb + cr)>>1;
int y;
cb+=cb;
y = temp[0];
dst[0 ]= ((y+cb)>>3) + (((y-cg)&0xFC)<<3) + (((y+cr)&0xF8)<<8);
y = temp[1];
dst[1 ]= ((y+cb)>>3) + (((y-cg)&0xFC)<<3) + (((y+cr)&0xF8)<<8);
y = temp[8];
dst[ stride]= ((y+cb)>>3) + (((y-cg)&0xFC)<<3) + (((y+cr)&0xF8)<<8);
y = temp[9];
dst[1+stride]= ((y+cb)>>3) + (((y-cg)&0xFC)<<3) + (((y+cr)&0xF8)<<8);
dst += 2;
}
dst += 2*stride - 2*8;
}
}
static int decode_i_mb(FourXContext *f){
int i;
f->dsp.clear_blocks(f->block[0]);
for(i=0; i<6; i++){
if(decode_i_block(f, f->block[i]) < 0)
return -1;
}
return 0;
}
static const uint8_t *read_huffman_tables(FourXContext *f, const uint8_t * const buf){
int frequency[512];
uint8_t flag[512];
int up[512];
uint8_t len_tab[257];
int bits_tab[257];
int start, end;
const uint8_t *ptr= buf;
int j;
memset(frequency, 0, sizeof(frequency));
memset(up, -1, sizeof(up));
start= *ptr++;
end= *ptr++;
for(;;){
int i;
for(i=start; i<=end; i++){
frequency[i]= *ptr++;
}
start= *ptr++;
if(start==0) break;
end= *ptr++;
}
frequency[256]=1;
while((ptr - buf)&3) ptr++; // 4byte align
for(j=257; j<512; j++){
int min_freq[2]= {256*256, 256*256};
int smallest[2]= {0, 0};
int i;
for(i=0; i<j; i++){
if(frequency[i] == 0) continue;
if(frequency[i] < min_freq[1]){
if(frequency[i] < min_freq[0]){
min_freq[1]= min_freq[0]; smallest[1]= smallest[0];
min_freq[0]= frequency[i];smallest[0]= i;
}else{
min_freq[1]= frequency[i];smallest[1]= i;
}
}
}
if(min_freq[1] == 256*256) break;
frequency[j]= min_freq[0] + min_freq[1];
flag[ smallest[0] ]= 0;
flag[ smallest[1] ]= 1;
up[ smallest[0] ]=
up[ smallest[1] ]= j;
frequency[ smallest[0] ]= frequency[ smallest[1] ]= 0;
}
for(j=0; j<257; j++){
int node;
int len=0;
int bits=0;
for(node= j; up[node] != -1; node= up[node]){
bits += flag[node]<<len;
len++;
if(len > 31) av_log(f->avctx, AV_LOG_ERROR, "vlc length overflow\n"); //can this happen at all ?
}
bits_tab[j]= bits;
len_tab[j]= len;
}
init_vlc(&f->pre_vlc, ACDC_VLC_BITS, 257,
len_tab , 1, 1,
bits_tab, 4, 4, 0);
return ptr;
}
static int mix(int c0, int c1){
int blue = 2*(c0&0x001F) + (c1&0x001F);
int green= (2*(c0&0x03E0) + (c1&0x03E0))>>5;
int red = 2*(c0>>10) + (c1>>10);
return red/3*1024 + green/3*32 + blue/3;
}
static int decode_i2_frame(FourXContext *f, const uint8_t *buf, int length){
int x, y, x2, y2;
const int width= f->avctx->width;
const int height= f->avctx->height;
uint16_t *dst= (uint16_t*)f->current_picture.data[0];
const int stride= f->current_picture.linesize[0]>>1;
for(y=0; y<height; y+=16){
for(x=0; x<width; x+=16){
unsigned int color[4], bits;
memset(color, 0, sizeof(color));
//warning following is purely guessed ...
color[0]= bytestream_get_le16(&buf);
color[1]= bytestream_get_le16(&buf);
if(color[0]&0x8000) av_log(NULL, AV_LOG_ERROR, "unk bit 1\n");
if(color[1]&0x8000) av_log(NULL, AV_LOG_ERROR, "unk bit 2\n");
color[2]= mix(color[0], color[1]);
color[3]= mix(color[1], color[0]);
bits= bytestream_get_le32(&buf);
for(y2=0; y2<16; y2++){
for(x2=0; x2<16; x2++){
int index= 2*(x2>>2) + 8*(y2>>2);
dst[y2*stride+x2]= color[(bits>>index)&3];
}
}
dst+=16;
}
dst += 16*stride - width;
}
return 0;
}
static int decode_i_frame(FourXContext *f, const uint8_t *buf, int length){
int x, y;
const int width= f->avctx->width;
const int height= f->avctx->height;
uint16_t *dst= (uint16_t*)f->current_picture.data[0];
const int stride= f->current_picture.linesize[0]>>1;
const unsigned int bitstream_size= AV_RL32(buf);
const int token_count av_unused = AV_RL32(buf + bitstream_size + 8);
unsigned int prestream_size= 4*AV_RL32(buf + bitstream_size + 4);
const uint8_t *prestream= buf + bitstream_size + 12;
if(prestream_size + bitstream_size + 12 != length
|| bitstream_size > (1<<26)
|| prestream_size > (1<<26)){
av_log(f->avctx, AV_LOG_ERROR, "size mismatch %d %d %d\n", prestream_size, bitstream_size, length);
return -1;
}
prestream= read_huffman_tables(f, prestream);
init_get_bits(&f->gb, buf + 4, 8*bitstream_size);
prestream_size= length + buf - prestream;
av_fast_malloc(&f->bitstream_buffer, &f->bitstream_buffer_size, prestream_size + FF_INPUT_BUFFER_PADDING_SIZE);
if (!f->bitstream_buffer)
return AVERROR(ENOMEM);
f->dsp.bswap_buf(f->bitstream_buffer, (const uint32_t*)prestream, prestream_size/4);
init_get_bits(&f->pre_gb, f->bitstream_buffer, 8*prestream_size);
f->last_dc= 0*128*8*8;
for(y=0; y<height; y+=16){
for(x=0; x<width; x+=16){
if(decode_i_mb(f) < 0)
return -1;
idct_put(f, x, y);
}
dst += 16*stride;
}
if(get_vlc2(&f->pre_gb, f->pre_vlc.table, ACDC_VLC_BITS, 3) != 256)
av_log(f->avctx, AV_LOG_ERROR, "end mismatch\n");
return 0;
}
static int decode_frame(AVCodecContext *avctx,
void *data, int *data_size,
AVPacket *avpkt)
{
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
FourXContext * const f = avctx->priv_data;
AVFrame *picture = data;
AVFrame *p, temp;
int i, frame_4cc, frame_size;
frame_4cc= AV_RL32(buf);
if(buf_size != AV_RL32(buf+4)+8 || buf_size < 20){
av_log(f->avctx, AV_LOG_ERROR, "size mismatch %d %d\n", buf_size, AV_RL32(buf+4));
}
if(frame_4cc == AV_RL32("cfrm")){
int free_index=-1;
const int data_size= buf_size - 20;
const int id= AV_RL32(buf+12);
const int whole_size= AV_RL32(buf+16);
CFrameBuffer *cfrm;
for(i=0; i<CFRAME_BUFFER_COUNT; i++){
if(f->cfrm[i].id && f->cfrm[i].id < avctx->frame_number)
av_log(f->avctx, AV_LOG_ERROR, "lost c frame %d\n", f->cfrm[i].id);
}
for(i=0; i<CFRAME_BUFFER_COUNT; i++){
if(f->cfrm[i].id == id) break;
if(f->cfrm[i].size == 0 ) free_index= i;
}
if(i>=CFRAME_BUFFER_COUNT){
i= free_index;
f->cfrm[i].id= id;
}
cfrm= &f->cfrm[i];
cfrm->data= av_fast_realloc(cfrm->data, &cfrm->allocated_size, cfrm->size + data_size + FF_INPUT_BUFFER_PADDING_SIZE);
if(!cfrm->data){ //explicit check needed as memcpy below might not catch a NULL
av_log(f->avctx, AV_LOG_ERROR, "realloc falure");
return -1;
}
memcpy(cfrm->data + cfrm->size, buf+20, data_size);
cfrm->size += data_size;
if(cfrm->size >= whole_size){
buf= cfrm->data;
frame_size= cfrm->size;
if(id != avctx->frame_number){
av_log(f->avctx, AV_LOG_ERROR, "cframe id mismatch %d %d\n", id, avctx->frame_number);
}
cfrm->size= cfrm->id= 0;
frame_4cc= AV_RL32("pfrm");
}else
return buf_size;
}else{
buf= buf + 12;
frame_size= buf_size - 12;
}
temp= f->current_picture;
f->current_picture= f->last_picture;
f->last_picture= temp;
p= &f->current_picture;
avctx->coded_frame= p;
avctx->flags |= CODEC_FLAG_EMU_EDGE; // alternatively we would have to use our own buffer management
if(p->data[0])
avctx->release_buffer(avctx, p);
p->reference= 1;
if(avctx->get_buffer(avctx, p) < 0){
av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
return -1;
}
if(frame_4cc == AV_RL32("ifr2")){
p->pict_type= FF_I_TYPE;
if(decode_i2_frame(f, buf-4, frame_size) < 0)
return -1;
}else if(frame_4cc == AV_RL32("ifrm")){
p->pict_type= FF_I_TYPE;
if(decode_i_frame(f, buf, frame_size) < 0)
return -1;
}else if(frame_4cc == AV_RL32("pfrm") || frame_4cc == AV_RL32("pfr2")){
if(!f->last_picture.data[0]){
f->last_picture.reference= 1;
if(avctx->get_buffer(avctx, &f->last_picture) < 0){
av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
return -1;
}
}
p->pict_type= FF_P_TYPE;
if(decode_p_frame(f, buf, frame_size) < 0)
return -1;
}else if(frame_4cc == AV_RL32("snd_")){
av_log(avctx, AV_LOG_ERROR, "ignoring snd_ chunk length:%d\n", buf_size);
}else{
av_log(avctx, AV_LOG_ERROR, "ignoring unknown chunk length:%d\n", buf_size);
}
p->key_frame= p->pict_type == FF_I_TYPE;
*picture= *p;
*data_size = sizeof(AVPicture);
emms_c();
return buf_size;
}
static av_cold void common_init(AVCodecContext *avctx){
FourXContext * const f = avctx->priv_data;
dsputil_init(&f->dsp, avctx);
f->avctx= avctx;
}
static av_cold int decode_init(AVCodecContext *avctx){
FourXContext * const f = avctx->priv_data;
if(avctx->extradata_size != 4 || !avctx->extradata) {
av_log(avctx, AV_LOG_ERROR, "extradata wrong or missing\n");
return 1;
}
f->version= AV_RL32(avctx->extradata)>>16;
common_init(avctx);
init_vlcs(f);
if(f->version>2) avctx->pix_fmt= PIX_FMT_RGB565;
else avctx->pix_fmt= PIX_FMT_BGR555;
return 0;
}
static av_cold int decode_end(AVCodecContext *avctx){
FourXContext * const f = avctx->priv_data;
int i;
av_freep(&f->bitstream_buffer);
f->bitstream_buffer_size=0;
for(i=0; i<CFRAME_BUFFER_COUNT; i++){
av_freep(&f->cfrm[i].data);
f->cfrm[i].allocated_size= 0;
}
free_vlc(&f->pre_vlc);
if(f->current_picture.data[0])
avctx->release_buffer(avctx, &f->current_picture);
if(f->last_picture.data[0])
avctx->release_buffer(avctx, &f->last_picture);
return 0;
}
AVCodec fourxm_decoder = {
"4xm",
AVMEDIA_TYPE_VIDEO,
CODEC_ID_4XM,
sizeof(FourXContext),
decode_init,
NULL,
decode_end,
decode_frame,
CODEC_CAP_DR1,
.long_name = NULL_IF_CONFIG_SMALL("4X Movie"),
};
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