[SCM] libav/experimental: 4xm codec
siretart at users.alioth.debian.org
siretart at users.alioth.debian.org
Sun Jun 30 15:36:27 UTC 2013
The following commit has been merged in the experimental branch:
commit 8809cfee0a6faa61055dfb2229879a822267a22b
Author: Michael Niedermayer <michaelni at gmx.at>
Date: Sun Jun 1 00:56:05 2003 +0000
4xm codec
Originally committed as revision 1923 to svn://svn.ffmpeg.org/ffmpeg/trunk
diff --git a/libavcodec/4xm.c b/libavcodec/4xm.c
new file mode 100644
index 0000000..7dac0d3
--- /dev/null
+++ b/libavcodec/4xm.c
@@ -0,0 +1,745 @@
+/*
+ * 4XM codec
+ * Copyright (c) 2003 Michael Niedermayer
+ *
+ * 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
+ */
+
+/**
+ * @file 4xm.c
+ * 4XM codec.
+ */
+
+#include "avcodec.h"
+#include "dsputil.h"
+#include "mpegvideo.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[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}
+ }
+};
+
+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[4];
+
+
+typedef struct CFrameBuffer{
+ int allocated_size;
+ 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;
+ uint8_t *bytestream;
+ uint16_t *wordstream;
+ int mv[256];
+ VLC pre_vlc;
+ int last_dc;
+ DCTELEM __align8 block[6][64];
+ uint8_t *bitstream_buffer;
+ int bitstream_buffer_size;
+ 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 void init_vlcs(FourXContext *f){
+ static int done = 0;
+ int i;
+
+ if (!done) {
+ done = 1;
+
+ for(i=0; i<4; i++){
+ init_vlc(&block_type_vlc[i], BLOCK_TYPE_VLC_BITS, 7,
+ &block_type_tab[i][0][1], 2, 1,
+ &block_type_tab[i][0][0], 2, 1);
+ }
+ }
+}
+
+static void init_mv(FourXContext *f){
+ int i;
+
+ for(i=0; i<256; i++){
+ f->mv[i] = mv[i][0] + mv[i][1]*f->current_picture.linesize[0]/2;
+ }
+}
+
+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++){
+ ((uint32_t*)dst)[0] = scale*((uint32_t*)src)[0] + dc;
+ if(scale) src += stride;
+ dst += stride;
+ }
+ break;
+ case 2:
+ for(i=0; i<h; i++){
+ ((uint32_t*)dst)[0] = scale*((uint32_t*)src)[0] + dc;
+ ((uint32_t*)dst)[1] = scale*((uint32_t*)src)[1] + dc;
+ if(scale) src += stride;
+ dst += stride;
+ }
+ break;
+ case 3:
+ for(i=0; i<h; i++){
+ ((uint32_t*)dst)[0] = scale*((uint32_t*)src)[0] + dc;
+ ((uint32_t*)dst)[1] = scale*((uint32_t*)src)[1] + dc;
+ ((uint32_t*)dst)[2] = scale*((uint32_t*)src)[2] + dc;
+ ((uint32_t*)dst)[3] = scale*((uint32_t*)src)[3] + 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[index].table, BLOCK_TYPE_VLC_BITS, 1);
+
+ assert(code>=0 && code<=6);
+
+ if(code == 0){
+ src += f->mv[ *f->bytestream++ ];
+ 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 == 4){
+ src += f->mv[ *f->bytestream++ ];
+ mcdc(dst, src, log2w, h, stride, 1, le2me_16(*f->wordstream++));
+ }else if(code == 5){
+ mcdc(dst, src, log2w, h, stride, 0, le2me_16(*f->wordstream++));
+ }else if(code == 6){
+ if(log2w){
+ dst[0] = le2me_16(*f->wordstream++);
+ dst[1] = le2me_16(*f->wordstream++);
+ }else{
+ dst[0 ] = le2me_16(*f->wordstream++);
+ dst[stride] = le2me_16(*f->wordstream++);
+ }
+ }
+}
+
+static int get32(void *p){
+ return le2me_32(*(uint32_t*)p);
+}
+
+static int decode_p_frame(FourXContext *f, 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;
+ const int bitstream_size= get32(buf+8);
+ const int bytestream_size= get32(buf+16);
+ const int wordstream_size= get32(buf+12);
+
+ if(bitstream_size+ bytestream_size+ wordstream_size + 20 != length)
+ printf("lengths %d %d %d %d\n", bitstream_size, bytestream_size, wordstream_size,
+ bitstream_size+ bytestream_size+ wordstream_size - length);
+
+ f->bitstream_buffer= av_fast_realloc(f->bitstream_buffer, &f->bitstream_buffer_size, bitstream_size + FF_INPUT_BUFFER_PADDING_SIZE);
+ f->dsp.bswap_buf((uint32_t*)f->bitstream_buffer, (uint32_t*)(buf + 20), bitstream_size/4);
+ init_get_bits(&f->gb, f->bitstream_buffer, 8*bitstream_size);
+
+ f->wordstream= (uint16_t*)(buf + 20 + bitstream_size);
+ f->bytestream= buf + 20 + 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)
+ printf(" %d %d %d bytes left\n",
+ bitstream_size - (get_bits_count(&f->gb)+31)/32*4,
+ bytestream_size - (f->bytestream - (buf + 20 + bitstream_size + wordstream_size)),
+ wordstream_size - (((uint8_t*)f->wordstream) - (buf + 20 + bitstream_size))
+ );
+
+ return 0;
+}
+
+/**
+ * decode block and dequantize.
+ * Note this is allmost 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){
+ printf("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) {
+ printf("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<6; i++) idct(block[i]);
+
+ 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] + 0x80;
+ int cr= block[5][x + 8*y] + 0x80;
+ int cg= (cb + cr)>>1;
+ int y;
+
+ cb+=cb - 0x80;
+
+ 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;
+ }
+// if(!(f->avctx->flags&CODEC_FLAG_GRAY)){
+}
+
+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 uint8_t *read_huffman_tables(FourXContext *f, 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;
+ 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++;
+// printf("%d %d %d\n", start, end, frequency[i]);
+ }
+ start= *ptr++;
+ if(start==0) break;
+
+ end= *ptr++;
+ }
+ frequency[256]=1;
+
+ while((ptr - buf)&3) ptr++; // 4byte align
+
+// for(j=0; j<16; j++)
+// printf("%2X", ptr[j]);
+
+ for(j=257; j<512; j++){
+ int smallest[2]= {-1,-1};
+ int i;
+ for(i=0; i<j; i++){
+ if(frequency[i] == 0) continue;
+ if(frequency[i] < frequency[ smallest[1] ]){
+ if(frequency[i] < frequency[ smallest[0] ]){
+ smallest[1]= smallest[0];
+ smallest[0]= i;
+ }else
+ smallest[1]= i;
+ }
+ }
+
+ if(smallest[1] == -1) break;
+
+ frequency[j]= frequency[ smallest[0] ] + frequency[ smallest[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) printf("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);
+
+ return ptr;
+}
+
+static int decode_i_frame(FourXContext *f, 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 int bitstream_size= get32(buf);
+ const int token_count= get32(buf + bitstream_size + 8);
+ int prestream_size= 4*get32(buf + bitstream_size + 4);
+ uint8_t *prestream= buf + bitstream_size + 12;
+
+ if(prestream_size + bitstream_size + 12 != length)
+ fprintf(stderr, "size missmatch %d %d %d\n", prestream_size, bitstream_size, length);
+
+ prestream= read_huffman_tables(f, prestream);
+
+ init_get_bits(&f->gb, buf + 4, 8*bitstream_size);
+
+ prestream_size= length + buf - prestream;
+
+ f->bitstream_buffer= av_fast_realloc(f->bitstream_buffer, &f->bitstream_buffer_size, prestream_size + FF_INPUT_BUFFER_PADDING_SIZE);
+ f->dsp.bswap_buf((uint32_t*)f->bitstream_buffer, (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)
+ printf("end missmatch\n");
+
+ return 0;
+}
+
+static int decode_frame(AVCodecContext *avctx,
+ void *data, int *data_size,
+ uint8_t *buf, int buf_size)
+{
+ FourXContext * const f = avctx->priv_data;
+ AVFrame *picture = data;
+ AVFrame *p, temp;
+ int i, frame_4cc, frame_size;
+
+ *data_size = 0;
+
+ /* special case for last picture */
+ if (buf_size == 0) {
+ return 0;
+ }
+
+ frame_4cc= get32(buf);
+ if(buf_size != get32(buf+4)+8){
+ fprintf(stderr, "size missmatch %d %d\n", buf_size, get32(buf+4));
+ }
+
+ if(frame_4cc == ff_get_fourcc("cfrm")){
+ int free_index=-1;
+ const int data_size= buf_size - 20;
+ const int id= get32(buf+12);
+ const int whole_size= get32(buf+16);
+ CFrameBuffer *cfrm;
+
+ for(i=0; i<CFRAME_BUFFER_COUNT; i++){
+ if(f->cfrm[i].id && f->cfrm[i].id < avctx->frame_number)
+ printf("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);
+
+ 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){
+ printf("cframe id missmatch %d %d\n", id, avctx->frame_number);
+ }
+
+ cfrm->size= cfrm->id= 0;
+ frame_4cc= ff_get_fourcc("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){
+ fprintf(stderr, "get_buffer() failed\n");
+ return -1;
+ }
+
+ if(frame_4cc == ff_get_fourcc("ifrm")){
+ p->pict_type= I_TYPE;
+ if(decode_i_frame(f, buf, frame_size) < 0)
+ return -1;
+ }else if(frame_4cc == ff_get_fourcc("pfrm")){
+ p->pict_type= P_TYPE;
+ if(decode_p_frame(f, buf, frame_size) < 0)
+ return -1;
+ }else if(frame_4cc == ff_get_fourcc("snd_")){
+ printf("ignoring snd_ chunk length:%d\n", buf_size);
+ }else{
+ printf("ignoring unknown chunk length:%d\n", buf_size);
+ }
+
+#if 0
+for(i=0; i<20; i++){
+ printf("%2X %c ", buf[i], clip(buf[i],16,126));
+}
+#endif
+
+ p->key_frame= p->pict_type == I_TYPE;
+
+ *picture= *p;
+ *data_size = sizeof(AVPicture);
+
+ emms_c();
+
+ return buf_size;
+}
+
+
+static void common_init(AVCodecContext *avctx){
+ FourXContext * const f = avctx->priv_data;
+
+ dsputil_init(&f->dsp, avctx);
+
+ f->avctx= avctx;
+}
+
+static int decode_init(AVCodecContext *avctx){
+ FourXContext * const f = avctx->priv_data;
+
+ common_init(avctx);
+ init_vlcs(f);
+
+ avctx->pix_fmt= PIX_FMT_RGB565;
+
+ return 0;
+}
+
+
+static 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);
+
+ avcodec_default_free_buffers(avctx);
+
+ return 0;
+}
+
+AVCodec fourxm_decoder = {
+ "4xm",
+ CODEC_TYPE_VIDEO,
+ CODEC_ID_4XM,
+ sizeof(FourXContext),
+ decode_init,
+ NULL,
+ decode_end,
+ decode_frame,
+ /*CODEC_CAP_DR1,*/
+};
+
diff --git a/libavcodec/Makefile b/libavcodec/Makefile
index 3ea0024..39566b3 100644
--- a/libavcodec/Makefile
+++ b/libavcodec/Makefile
@@ -17,7 +17,7 @@ OBJS= common.o utils.o mem.o allcodecs.o \
mpeg12.o mpegaudiodec.o pcm.o simple_idct.o \
ratecontrol.o adpcm.o eval.o dv.o error_resilience.o \
fft.o mdct.o mace.o huffyuv.o cyuv.o opts.o raw.o h264.o golomb.o \
- vp3.o asv1.o
+ vp3.o asv1.o 4xm.o cabac.o
ifeq ($(AMR_NB),yes)
OBJS+= amr.o
diff --git a/libavcodec/allcodecs.c b/libavcodec/allcodecs.c
index c8742b8..980a470 100644
--- a/libavcodec/allcodecs.c
+++ b/libavcodec/allcodecs.c
@@ -105,6 +105,7 @@ void avcodec_register_all(void)
register_avcodec(&h264_decoder);
register_avcodec(&vp3_decoder);
register_avcodec(&asv1_decoder);
+ register_avcodec(&fourxm_decoder);
#ifdef CONFIG_AC3
register_avcodec(&ac3_decoder);
#endif
diff --git a/libavcodec/avcodec.h b/libavcodec/avcodec.h
index 49a2ebd..7ed71c5 100644
--- a/libavcodec/avcodec.h
+++ b/libavcodec/avcodec.h
@@ -1248,6 +1248,7 @@ extern AVCodec amr_nb_decoder;
extern AVCodec aac_decoder;
extern AVCodec mpeg4aac_decoder;
extern AVCodec asv1_decoder;
+extern AVCodec fourxm_decoder;
/* pcm codecs */
#define PCM_CODEC(id, name) \
--
Libav/FFmpeg packaging
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