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757 lines
23 KiB
757 lines
23 KiB
/* |
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* 4XM codec |
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* Copyright (c) 2003 Michael Niedermayer |
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* |
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* This library is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2 of the License, or (at your option) any later version. |
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* |
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* This library is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with this library; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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|
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/** |
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* @file 4xm.c |
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* 4XM codec. |
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*/ |
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|
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#include "avcodec.h" |
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#include "dsputil.h" |
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#include "mpegvideo.h" |
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//#undef NDEBUG |
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//#include <assert.h> |
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#define BLOCK_TYPE_VLC_BITS 5 |
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#define ACDC_VLC_BITS 9 |
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#define CFRAME_BUFFER_COUNT 100 |
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static const uint8_t block_type_tab[4][8][2]={ |
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{ //{8,4,2}x{8,4,2} |
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{ 0,1}, { 2,2}, { 6,3}, {14,4}, {30,5}, {31,5}, { 0,0} |
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},{ //{8,4}x1 |
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{ 0,1}, { 0,0}, { 2,2}, { 6,3}, {14,4}, {15,4}, { 0,0} |
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},{ //1x{8,4} |
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{ 0,1}, { 2,2}, { 0,0}, { 6,3}, {14,4}, {15,4}, { 0,0} |
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},{ //1x2, 2x1 |
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{ 0,1}, { 0,0}, { 0,0}, { 2,2}, { 6,3}, {14,4}, {15,4} |
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} |
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}; |
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static const uint8_t size2index[4][4]={ |
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{-1, 3, 1, 1}, |
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{ 3, 0, 0, 0}, |
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{ 2, 0, 0, 0}, |
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{ 2, 0, 0, 0}, |
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}; |
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static const int8_t mv[256][2]={ |
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{ 0, 0},{ 0, -1},{ -1, 0},{ 1, 0},{ 0, 1},{ -1, -1},{ 1, -1},{ -1, 1}, |
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{ 1, 1},{ 0, -2},{ -2, 0},{ 2, 0},{ 0, 2},{ -1, -2},{ 1, -2},{ -2, -1}, |
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{ 2, -1},{ -2, 1},{ 2, 1},{ -1, 2},{ 1, 2},{ -2, -2},{ 2, -2},{ -2, 2}, |
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{ 2, 2},{ 0, -3},{ -3, 0},{ 3, 0},{ 0, 3},{ -1, -3},{ 1, -3},{ -3, -1}, |
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{ 3, -1},{ -3, 1},{ 3, 1},{ -1, 3},{ 1, 3},{ -2, -3},{ 2, -3},{ -3, -2}, |
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{ 3, -2},{ -3, 2},{ 3, 2},{ -2, 3},{ 2, 3},{ 0, -4},{ -4, 0},{ 4, 0}, |
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{ 0, 4},{ -1, -4},{ 1, -4},{ -4, -1},{ 4, -1},{ 4, 1},{ -1, 4},{ 1, 4}, |
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{ -3, -3},{ -3, 3},{ 3, 3},{ -2, -4},{ -4, -2},{ 4, -2},{ -4, 2},{ -2, 4}, |
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{ 2, 4},{ -3, -4},{ 3, -4},{ 4, -3},{ -5, 0},{ -4, 3},{ -3, 4},{ 3, 4}, |
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{ -1, -5},{ -5, -1},{ -5, 1},{ -1, 5},{ -2, -5},{ 2, -5},{ 5, -2},{ 5, 2}, |
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{ -4, -4},{ -4, 4},{ -3, -5},{ -5, -3},{ -5, 3},{ 3, 5},{ -6, 0},{ 0, 6}, |
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{ -6, -1},{ -6, 1},{ 1, 6},{ 2, -6},{ -6, 2},{ 2, 6},{ -5, -4},{ 5, 4}, |
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{ 4, 5},{ -6, -3},{ 6, 3},{ -7, 0},{ -1, -7},{ 5, -5},{ -7, 1},{ -1, 7}, |
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{ 4, -6},{ 6, 4},{ -2, -7},{ -7, 2},{ -3, -7},{ 7, -3},{ 3, 7},{ 6, -5}, |
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{ 0, -8},{ -1, -8},{ -7, -4},{ -8, 1},{ 4, 7},{ 2, -8},{ -2, 8},{ 6, 6}, |
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{ -8, 3},{ 5, -7},{ -5, 7},{ 8, -4},{ 0, -9},{ -9, -1},{ 1, 9},{ 7, -6}, |
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{ -7, 6},{ -5, -8},{ -5, 8},{ -9, 3},{ 9, -4},{ 7, -7},{ 8, -6},{ 6, 8}, |
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{ 10, 1},{-10, 2},{ 9, -5},{ 10, -3},{ -8, -7},{-10, -4},{ 6, -9},{-11, 0}, |
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{ 11, 1},{-11, -2},{ -2, 11},{ 7, -9},{ -7, 9},{ 10, 6},{ -4, 11},{ 8, -9}, |
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{ 8, 9},{ 5, 11},{ 7,-10},{ 12, -3},{ 11, 6},{ -9, -9},{ 8, 10},{ 5, 12}, |
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{-11, 7},{ 13, 2},{ 6,-12},{ 10, 9},{-11, 8},{ -7, 12},{ 0, 14},{ 14, -2}, |
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{ -9, 11},{ -6, 13},{-14, -4},{ -5,-14},{ 5, 14},{-15, -1},{-14, -6},{ 3,-15}, |
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{ 11,-11},{ -7, 14},{ -5, 15},{ 8,-14},{ 15, 6},{ 3, 16},{ 7,-15},{-16, 5}, |
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{ 0, 17},{-16, -6},{-10, 14},{-16, 7},{ 12, 13},{-16, 8},{-17, 6},{-18, 3}, |
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{ -7, 17},{ 15, 11},{ 16, 10},{ 2,-19},{ 3,-19},{-11,-16},{-18, 8},{-19, -6}, |
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{ 2,-20},{-17,-11},{-10,-18},{ 8, 19},{-21, -1},{-20, 7},{ -4, 21},{ 21, 5}, |
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{ 15, 16},{ 2,-22},{-10,-20},{-22, 5},{ 20,-11},{ -7,-22},{-12, 20},{ 23, -5}, |
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{ 13,-20},{ 24, -2},{-15, 19},{-11, 22},{ 16, 19},{ 23,-10},{-18,-18},{ -9,-24}, |
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{ 24,-10},{ -3, 26},{-23, 13},{-18,-20},{ 17, 21},{ -4, 27},{ 27, 6},{ 1,-28}, |
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{-11, 26},{-17,-23},{ 7, 28},{ 11,-27},{ 29, 5},{-23,-19},{-28,-11},{-21, 22}, |
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{-30, 7},{-17, 26},{-27, 16},{ 13, 29},{ 19,-26},{ 10,-31},{-14,-30},{ 20,-27}, |
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{-29, 18},{-16,-31},{-28,-22},{ 21,-30},{-25, 28},{ 26,-29},{ 25,-32},{-32,-32} |
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}; |
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// this is simply the scaled down elementwise product of the standard jpeg quantizer table and the AAN premul table |
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static const uint8_t dequant_table[64]={ |
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16, 15, 13, 19, 24, 31, 28, 17, |
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17, 23, 25, 31, 36, 63, 45, 21, |
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18, 24, 27, 37, 52, 59, 49, 20, |
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16, 28, 34, 40, 60, 80, 51, 20, |
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18, 31, 48, 66, 68, 86, 56, 21, |
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19, 38, 56, 59, 64, 64, 48, 20, |
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27, 48, 55, 55, 56, 51, 35, 15, |
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20, 35, 34, 32, 31, 22, 15, 8, |
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}; |
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static VLC block_type_vlc[4]; |
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typedef struct CFrameBuffer{ |
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int allocated_size; |
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int size; |
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int id; |
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uint8_t *data; |
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}CFrameBuffer; |
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typedef struct FourXContext{ |
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AVCodecContext *avctx; |
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DSPContext dsp; |
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AVFrame current_picture, last_picture; |
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GetBitContext pre_gb; ///< ac/dc prefix |
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GetBitContext gb; |
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uint8_t *bytestream; |
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uint16_t *wordstream; |
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int mv[256]; |
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VLC pre_vlc; |
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int last_dc; |
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DECLARE_ALIGNED_8(DCTELEM, block[6][64]); |
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uint8_t *bitstream_buffer; |
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unsigned int bitstream_buffer_size; |
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CFrameBuffer cfrm[CFRAME_BUFFER_COUNT]; |
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} FourXContext; |
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#define FIX_1_082392200 70936 |
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#define FIX_1_414213562 92682 |
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#define FIX_1_847759065 121095 |
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#define FIX_2_613125930 171254 |
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#define MULTIPLY(var,const) (((var)*(const)) >> 16) |
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static void idct(DCTELEM block[64]){ |
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int tmp0, tmp1, tmp2, tmp3, tmp4, tmp5, tmp6, tmp7; |
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int tmp10, tmp11, tmp12, tmp13; |
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int z5, z10, z11, z12, z13; |
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int i; |
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int temp[64]; |
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for(i=0; i<8; i++){ |
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tmp10 = block[8*0 + i] + block[8*4 + i]; |
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tmp11 = block[8*0 + i] - block[8*4 + i]; |
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tmp13 = block[8*2 + i] + block[8*6 + i]; |
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tmp12 = MULTIPLY(block[8*2 + i] - block[8*6 + i], FIX_1_414213562) - tmp13; |
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tmp0 = tmp10 + tmp13; |
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tmp3 = tmp10 - tmp13; |
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tmp1 = tmp11 + tmp12; |
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tmp2 = tmp11 - tmp12; |
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z13 = block[8*5 + i] + block[8*3 + i]; |
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z10 = block[8*5 + i] - block[8*3 + i]; |
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z11 = block[8*1 + i] + block[8*7 + i]; |
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z12 = block[8*1 + i] - block[8*7 + i]; |
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tmp7 = z11 + z13; |
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tmp11 = MULTIPLY(z11 - z13, FIX_1_414213562); |
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z5 = MULTIPLY(z10 + z12, FIX_1_847759065); |
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tmp10 = MULTIPLY(z12, FIX_1_082392200) - z5; |
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tmp12 = MULTIPLY(z10, - FIX_2_613125930) + z5; |
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tmp6 = tmp12 - tmp7; |
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tmp5 = tmp11 - tmp6; |
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tmp4 = tmp10 + tmp5; |
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temp[8*0 + i] = tmp0 + tmp7; |
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temp[8*7 + i] = tmp0 - tmp7; |
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temp[8*1 + i] = tmp1 + tmp6; |
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temp[8*6 + i] = tmp1 - tmp6; |
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temp[8*2 + i] = tmp2 + tmp5; |
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temp[8*5 + i] = tmp2 - tmp5; |
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temp[8*4 + i] = tmp3 + tmp4; |
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temp[8*3 + i] = tmp3 - tmp4; |
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} |
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for(i=0; i<8*8; i+=8){ |
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tmp10 = temp[0 + i] + temp[4 + i]; |
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tmp11 = temp[0 + i] - temp[4 + i]; |
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tmp13 = temp[2 + i] + temp[6 + i]; |
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tmp12 = MULTIPLY(temp[2 + i] - temp[6 + i], FIX_1_414213562) - tmp13; |
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tmp0 = tmp10 + tmp13; |
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tmp3 = tmp10 - tmp13; |
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tmp1 = tmp11 + tmp12; |
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tmp2 = tmp11 - tmp12; |
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z13 = temp[5 + i] + temp[3 + i]; |
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z10 = temp[5 + i] - temp[3 + i]; |
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z11 = temp[1 + i] + temp[7 + i]; |
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z12 = temp[1 + i] - temp[7 + i]; |
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tmp7 = z11 + z13; |
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tmp11 = MULTIPLY(z11 - z13, FIX_1_414213562); |
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z5 = MULTIPLY(z10 + z12, FIX_1_847759065); |
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tmp10 = MULTIPLY(z12, FIX_1_082392200) - z5; |
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tmp12 = MULTIPLY(z10, - FIX_2_613125930) + z5; |
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tmp6 = tmp12 - tmp7; |
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tmp5 = tmp11 - tmp6; |
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tmp4 = tmp10 + tmp5; |
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block[0 + i] = (tmp0 + tmp7)>>6; |
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block[7 + i] = (tmp0 - tmp7)>>6; |
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block[1 + i] = (tmp1 + tmp6)>>6; |
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block[6 + i] = (tmp1 - tmp6)>>6; |
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block[2 + i] = (tmp2 + tmp5)>>6; |
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block[5 + i] = (tmp2 - tmp5)>>6; |
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block[4 + i] = (tmp3 + tmp4)>>6; |
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block[3 + i] = (tmp3 - tmp4)>>6; |
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} |
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} |
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static void init_vlcs(FourXContext *f){ |
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int i; |
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for(i=0; i<4; i++){ |
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init_vlc(&block_type_vlc[i], BLOCK_TYPE_VLC_BITS, 7, |
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&block_type_tab[i][0][1], 2, 1, |
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&block_type_tab[i][0][0], 2, 1, 1); |
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} |
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} |
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static void init_mv(FourXContext *f){ |
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int i; |
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for(i=0; i<256; i++){ |
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f->mv[i] = mv[i][0] + mv[i][1]*f->current_picture.linesize[0]/2; |
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} |
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} |
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static inline void mcdc(uint16_t *dst, uint16_t *src, int log2w, int h, int stride, int scale, int dc){ |
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int i; |
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dc*= 0x10001; |
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switch(log2w){ |
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case 0: |
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for(i=0; i<h; i++){ |
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dst[0] = scale*src[0] + dc; |
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if(scale) src += stride; |
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dst += stride; |
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} |
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break; |
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case 1: |
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for(i=0; i<h; i++){ |
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((uint32_t*)dst)[0] = scale*((uint32_t*)src)[0] + dc; |
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if(scale) src += stride; |
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dst += stride; |
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} |
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break; |
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case 2: |
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for(i=0; i<h; i++){ |
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((uint32_t*)dst)[0] = scale*((uint32_t*)src)[0] + dc; |
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((uint32_t*)dst)[1] = scale*((uint32_t*)src)[1] + dc; |
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if(scale) src += stride; |
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dst += stride; |
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} |
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break; |
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case 3: |
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for(i=0; i<h; i++){ |
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((uint32_t*)dst)[0] = scale*((uint32_t*)src)[0] + dc; |
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((uint32_t*)dst)[1] = scale*((uint32_t*)src)[1] + dc; |
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((uint32_t*)dst)[2] = scale*((uint32_t*)src)[2] + dc; |
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((uint32_t*)dst)[3] = scale*((uint32_t*)src)[3] + dc; |
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if(scale) src += stride; |
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dst += stride; |
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} |
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break; |
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default: assert(0); |
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} |
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} |
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static void decode_p_block(FourXContext *f, uint16_t *dst, uint16_t *src, int log2w, int log2h, int stride){ |
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const int index= size2index[log2h][log2w]; |
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const int h= 1<<log2h; |
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int code= get_vlc2(&f->gb, block_type_vlc[index].table, BLOCK_TYPE_VLC_BITS, 1); |
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assert(code>=0 && code<=6); |
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if(code == 0){ |
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src += f->mv[ *f->bytestream++ ]; |
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mcdc(dst, src, log2w, h, stride, 1, 0); |
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}else if(code == 1){ |
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log2h--; |
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decode_p_block(f, dst , src , log2w, log2h, stride); |
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decode_p_block(f, dst + (stride<<log2h), src + (stride<<log2h), log2w, log2h, stride); |
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}else if(code == 2){ |
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log2w--; |
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decode_p_block(f, dst , src , log2w, log2h, stride); |
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decode_p_block(f, dst + (1<<log2w), src + (1<<log2w), log2w, log2h, stride); |
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}else if(code == 4){ |
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src += f->mv[ *f->bytestream++ ]; |
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mcdc(dst, src, log2w, h, stride, 1, le2me_16(*f->wordstream++)); |
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}else if(code == 5){ |
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mcdc(dst, src, log2w, h, stride, 0, le2me_16(*f->wordstream++)); |
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}else if(code == 6){ |
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if(log2w){ |
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dst[0] = le2me_16(*f->wordstream++); |
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dst[1] = le2me_16(*f->wordstream++); |
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}else{ |
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dst[0 ] = le2me_16(*f->wordstream++); |
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dst[stride] = le2me_16(*f->wordstream++); |
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} |
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} |
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} |
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static int get32(void *p){ |
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return le2me_32(*(uint32_t*)p); |
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} |
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static int decode_p_frame(FourXContext *f, uint8_t *buf, int length){ |
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int x, y; |
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const int width= f->avctx->width; |
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const int height= f->avctx->height; |
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uint16_t *src= (uint16_t*)f->last_picture.data[0]; |
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uint16_t *dst= (uint16_t*)f->current_picture.data[0]; |
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const int stride= f->current_picture.linesize[0]>>1; |
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const unsigned int bitstream_size= get32(buf+8); |
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const unsigned int bytestream_size= get32(buf+16); |
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const unsigned int wordstream_size= get32(buf+12); |
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if(bitstream_size+ bytestream_size+ wordstream_size + 20 != length |
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|| bitstream_size > (1<<26) |
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|| bytestream_size > (1<<26) |
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|| wordstream_size > (1<<26) |
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){ |
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av_log(f->avctx, AV_LOG_ERROR, "lengths %d %d %d %d\n", bitstream_size, bytestream_size, wordstream_size, |
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bitstream_size+ bytestream_size+ wordstream_size - length); |
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return -1; |
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} |
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f->bitstream_buffer= av_fast_realloc(f->bitstream_buffer, &f->bitstream_buffer_size, bitstream_size + FF_INPUT_BUFFER_PADDING_SIZE); |
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f->dsp.bswap_buf((uint32_t*)f->bitstream_buffer, (uint32_t*)(buf + 20), bitstream_size/4); |
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init_get_bits(&f->gb, f->bitstream_buffer, 8*bitstream_size); |
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f->wordstream= (uint16_t*)(buf + 20 + bitstream_size); |
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f->bytestream= buf + 20 + bitstream_size + wordstream_size; |
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init_mv(f); |
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for(y=0; y<height; y+=8){ |
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for(x=0; x<width; x+=8){ |
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decode_p_block(f, dst + x, src + x, 3, 3, stride); |
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} |
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src += 8*stride; |
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dst += 8*stride; |
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} |
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if(bitstream_size != (get_bits_count(&f->gb)+31)/32*4) |
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av_log(f->avctx, AV_LOG_ERROR, " %d %td %td bytes left\n", |
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bitstream_size - (get_bits_count(&f->gb)+31)/32*4, |
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bytestream_size - (f->bytestream - (buf + 20 + bitstream_size + wordstream_size)), |
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wordstream_size - (((uint8_t*)f->wordstream) - (buf + 20 + bitstream_size)) |
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); |
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return 0; |
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} |
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/** |
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* decode block and dequantize. |
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* Note this is allmost identical to mjpeg |
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*/ |
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static int decode_i_block(FourXContext *f, DCTELEM *block){ |
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int code, i, j, level, val; |
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|
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/* DC coef */ |
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val = get_vlc2(&f->pre_gb, f->pre_vlc.table, ACDC_VLC_BITS, 3); |
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if (val>>4){ |
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av_log(f->avctx, AV_LOG_ERROR, "error dc run != 0\n"); |
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} |
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if(val) |
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val = get_xbits(&f->gb, val); |
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val = val * dequant_table[0] + f->last_dc; |
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f->last_dc = |
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block[0] = val; |
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/* AC coefs */ |
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i = 1; |
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for(;;) { |
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code = get_vlc2(&f->pre_gb, f->pre_vlc.table, ACDC_VLC_BITS, 3); |
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/* EOB */ |
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if (code == 0) |
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break; |
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if (code == 0xf0) { |
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i += 16; |
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} else { |
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level = get_xbits(&f->gb, code & 0xf); |
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i += code >> 4; |
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if (i >= 64) { |
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av_log(f->avctx, AV_LOG_ERROR, "run %d oveflow\n", i); |
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return 0; |
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} |
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j= ff_zigzag_direct[i]; |
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block[j] = level * dequant_table[j]; |
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i++; |
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if (i >= 64) |
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break; |
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} |
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} |
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return 0; |
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} |
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static inline void idct_put(FourXContext *f, int x, int y){ |
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DCTELEM (*block)[64]= f->block; |
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int stride= f->current_picture.linesize[0]>>1; |
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int i; |
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uint16_t *dst = ((uint16_t*)f->current_picture.data[0]) + y * stride + x; |
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for(i=0; i<4; i++){ |
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block[i][0] += 0x80*8*8; |
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idct(block[i]); |
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} |
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if(!(f->avctx->flags&CODEC_FLAG_GRAY)){ |
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for(i=4; i<6; i++) idct(block[i]); |
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} |
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/* Note transform is: |
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y= ( 1b + 4g + 2r)/14 |
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cb=( 3b - 2g - 1r)/14 |
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cr=(-1b - 4g + 5r)/14 |
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*/ |
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for(y=0; y<8; y++){ |
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for(x=0; x<8; x++){ |
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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 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 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 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 unsigned int bitstream_size= get32(buf); |
|
const int token_count __attribute__((unused)) = get32(buf + bitstream_size + 8); |
|
unsigned int prestream_size= 4*get32(buf + bitstream_size + 4); |
|
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, (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, |
|
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= get32(buf); |
|
if(buf_size != get32(buf+4)+8 || buf_size < 20){ |
|
av_log(f->avctx, AV_LOG_ERROR, "size mismatch %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) |
|
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= 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){ |
|
av_log(avctx, AV_LOG_ERROR, "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_")){ |
|
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); |
|
} |
|
|
|
#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); |
|
|
|
return 0; |
|
} |
|
|
|
AVCodec fourxm_decoder = { |
|
"4xm", |
|
CODEC_TYPE_VIDEO, |
|
CODEC_ID_4XM, |
|
sizeof(FourXContext), |
|
decode_init, |
|
NULL, |
|
decode_end, |
|
decode_frame, |
|
/*CODEC_CAP_DR1,*/ |
|
}; |
|
|
|
|