| /* |
| * 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 libavcodec/4xm.c |
| * 4XM codec. |
| */ |
| |
| #include "libavutil/intreadwrite.h" |
| #include "avcodec.h" |
| #include "dsputil.h" |
| #include "bitstream.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_8(DCTELEM, block[6][64]); |
| uint8_t *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){ |
| int i; |
| |
| for(i=0; i<8; i++){ |
| 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, 1); |
| } |
| } |
| |
| 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; |
| } |
| } |
| |
| 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[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, 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 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; |
| } |
| |
| 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, (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; |
| |
| 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, (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, |
| const uint8_t *buf, int buf_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")){ |
| 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_RGB555; |
| |
| 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); |
| |
| return 0; |
| } |
| |
| AVCodec fourxm_decoder = { |
| "4xm", |
| CODEC_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"), |
| }; |
| |
