yading@10: /* yading@10: * 4XM codec yading@10: * Copyright (c) 2003 Michael Niedermayer yading@10: * yading@10: * This file is part of FFmpeg. yading@10: * yading@10: * FFmpeg is free software; you can redistribute it and/or yading@10: * modify it under the terms of the GNU Lesser General Public yading@10: * License as published by the Free Software Foundation; either yading@10: * version 2.1 of the License, or (at your option) any later version. yading@10: * yading@10: * FFmpeg is distributed in the hope that it will be useful, yading@10: * but WITHOUT ANY WARRANTY; without even the implied warranty of yading@10: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU yading@10: * Lesser General Public License for more details. yading@10: * yading@10: * You should have received a copy of the GNU Lesser General Public yading@10: * License along with FFmpeg; if not, write to the Free Software yading@10: * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA yading@10: */ yading@10: yading@10: /** yading@10: * @file yading@10: * 4XM codec. yading@10: */ yading@10: yading@10: #include "libavutil/frame.h" yading@10: #include "libavutil/intreadwrite.h" yading@10: #include "avcodec.h" yading@10: #include "bytestream.h" yading@10: #include "dsputil.h" yading@10: #include "get_bits.h" yading@10: #include "internal.h" yading@10: yading@10: #include "libavutil/avassert.h" yading@10: yading@10: #define BLOCK_TYPE_VLC_BITS 5 yading@10: #define ACDC_VLC_BITS 9 yading@10: yading@10: #define CFRAME_BUFFER_COUNT 100 yading@10: yading@10: static const uint8_t block_type_tab[2][4][8][2] = { yading@10: { yading@10: { // { 8, 4, 2 } x { 8, 4, 2} yading@10: { 0, 1 }, { 2, 2 }, { 6, 3 }, { 14, 4 }, { 30, 5 }, { 31, 5 }, { 0, 0 } yading@10: }, { // { 8, 4 } x 1 yading@10: { 0, 1 }, { 0, 0 }, { 2, 2 }, { 6, 3 }, { 14, 4 }, { 15, 4 }, { 0, 0 } yading@10: }, { // 1 x { 8, 4 } yading@10: { 0, 1 }, { 2, 2 }, { 0, 0 }, { 6, 3 }, { 14, 4 }, { 15, 4 }, { 0, 0 } yading@10: }, { // 1 x 2, 2 x 1 yading@10: { 0, 1 }, { 0, 0 }, { 0, 0 }, { 2, 2 }, { 6, 3 }, { 14, 4 }, { 15, 4 } yading@10: } yading@10: }, { yading@10: { // { 8, 4, 2 } x { 8, 4, 2} yading@10: { 1, 2 }, { 4, 3 }, { 5, 3 }, { 0, 2 }, { 6, 3 }, { 7, 3 }, { 0, 0 } yading@10: }, {// { 8, 4 } x 1 yading@10: { 1, 2 }, { 0, 0 }, { 2, 2 }, { 0, 2 }, { 6, 3 }, { 7, 3 }, { 0, 0 } yading@10: }, {// 1 x { 8, 4 } yading@10: { 1, 2 }, { 2, 2 }, { 0, 0 }, { 0, 2 }, { 6, 3 }, { 7, 3 }, { 0, 0 } yading@10: }, {// 1 x 2, 2 x 1 yading@10: { 1, 2 }, { 0, 0 }, { 0, 0 }, { 0, 2 }, { 2, 2 }, { 6, 3 }, { 7, 3 } yading@10: } yading@10: } yading@10: }; yading@10: yading@10: static const uint8_t size2index[4][4] = { yading@10: { -1, 3, 1, 1 }, yading@10: { 3, 0, 0, 0 }, yading@10: { 2, 0, 0, 0 }, yading@10: { 2, 0, 0, 0 }, yading@10: }; yading@10: yading@10: static const int8_t mv[256][2] = { yading@10: { 0, 0 }, { 0, -1 }, { -1, 0 }, { 1, 0 }, { 0, 1 }, { -1, -1 }, { 1, -1 }, { -1, 1 }, yading@10: { 1, 1 }, { 0, -2 }, { -2, 0 }, { 2, 0 }, { 0, 2 }, { -1, -2 }, { 1, -2 }, { -2, -1 }, yading@10: { 2, -1 }, { -2, 1 }, { 2, 1 }, { -1, 2 }, { 1, 2 }, { -2, -2 }, { 2, -2 }, { -2, 2 }, yading@10: { 2, 2 }, { 0, -3 }, { -3, 0 }, { 3, 0 }, { 0, 3 }, { -1, -3 }, { 1, -3 }, { -3, -1 }, yading@10: { 3, -1 }, { -3, 1 }, { 3, 1 }, { -1, 3 }, { 1, 3 }, { -2, -3 }, { 2, -3 }, { -3, -2 }, yading@10: { 3, -2 }, { -3, 2 }, { 3, 2 }, { -2, 3 }, { 2, 3 }, { 0, -4 }, { -4, 0 }, { 4, 0 }, yading@10: { 0, 4 }, { -1, -4 }, { 1, -4 }, { -4, -1 }, { 4, -1 }, { 4, 1 }, { -1, 4 }, { 1, 4 }, yading@10: { -3, -3 }, { -3, 3 }, { 3, 3 }, { -2, -4 }, { -4, -2 }, { 4, -2 }, { -4, 2 }, { -2, 4 }, yading@10: { 2, 4 }, { -3, -4 }, { 3, -4 }, { 4, -3 }, { -5, 0 }, { -4, 3 }, { -3, 4 }, { 3, 4 }, yading@10: { -1, -5 }, { -5, -1 }, { -5, 1 }, { -1, 5 }, { -2, -5 }, { 2, -5 }, { 5, -2 }, { 5, 2 }, yading@10: { -4, -4 }, { -4, 4 }, { -3, -5 }, { -5, -3 }, { -5, 3 }, { 3, 5 }, { -6, 0 }, { 0, 6 }, yading@10: { -6, -1 }, { -6, 1 }, { 1, 6 }, { 2, -6 }, { -6, 2 }, { 2, 6 }, { -5, -4 }, { 5, 4 }, yading@10: { 4, 5 }, { -6, -3 }, { 6, 3 }, { -7, 0 }, { -1, -7 }, { 5, -5 }, { -7, 1 }, { -1, 7 }, yading@10: { 4, -6 }, { 6, 4 }, { -2, -7 }, { -7, 2 }, { -3, -7 }, { 7, -3 }, { 3, 7 }, { 6, -5 }, yading@10: { 0, -8 }, { -1, -8 }, { -7, -4 }, { -8, 1 }, { 4, 7 }, { 2, -8 }, { -2, 8 }, { 6, 6 }, yading@10: { -8, 3 }, { 5, -7 }, { -5, 7 }, { 8, -4 }, { 0, -9 }, { -9, -1 }, { 1, 9 }, { 7, -6 }, yading@10: { -7, 6 }, { -5, -8 }, { -5, 8 }, { -9, 3 }, { 9, -4 }, { 7, -7 }, { 8, -6 }, { 6, 8 }, yading@10: { 10, 1 }, { -10, 2 }, { 9, -5 }, { 10, -3 }, { -8, -7 }, { -10, -4 }, { 6, -9 }, { -11, 0 }, yading@10: { 11, 1 }, { -11, -2 }, { -2, 11 }, { 7, -9 }, { -7, 9 }, { 10, 6 }, { -4, 11 }, { 8, -9 }, yading@10: { 8, 9 }, { 5, 11 }, { 7, -10 }, { 12, -3 }, { 11, 6 }, { -9, -9 }, { 8, 10 }, { 5, 12 }, yading@10: { -11, 7 }, { 13, 2 }, { 6, -12 }, { 10, 9 }, { -11, 8 }, { -7, 12 }, { 0, 14 }, { 14, -2 }, yading@10: { -9, 11 }, { -6, 13 }, { -14, -4 }, { -5, -14 }, { 5, 14 }, { -15, -1 }, { -14, -6 }, { 3, -15 }, yading@10: { 11, -11 }, { -7, 14 }, { -5, 15 }, { 8, -14 }, { 15, 6 }, { 3, 16 }, { 7, -15 }, { -16, 5 }, yading@10: { 0, 17 }, { -16, -6 }, { -10, 14 }, { -16, 7 }, { 12, 13 }, { -16, 8 }, { -17, 6 }, { -18, 3 }, yading@10: { -7, 17 }, { 15, 11 }, { 16, 10 }, { 2, -19 }, { 3, -19 }, { -11, -16 }, { -18, 8 }, { -19, -6 }, yading@10: { 2, -20 }, { -17, -11 }, { -10, -18 }, { 8, 19 }, { -21, -1 }, { -20, 7 }, { -4, 21 }, { 21, 5 }, yading@10: { 15, 16 }, { 2, -22 }, { -10, -20 }, { -22, 5 }, { 20, -11 }, { -7, -22 }, { -12, 20 }, { 23, -5 }, yading@10: { 13, -20 }, { 24, -2 }, { -15, 19 }, { -11, 22 }, { 16, 19 }, { 23, -10 }, { -18, -18 }, { -9, -24 }, yading@10: { 24, -10 }, { -3, 26 }, { -23, 13 }, { -18, -20 }, { 17, 21 }, { -4, 27 }, { 27, 6 }, { 1, -28 }, yading@10: { -11, 26 }, { -17, -23 }, { 7, 28 }, { 11, -27 }, { 29, 5 }, { -23, -19 }, { -28, -11 }, { -21, 22 }, yading@10: { -30, 7 }, { -17, 26 }, { -27, 16 }, { 13, 29 }, { 19, -26 }, { 10, -31 }, { -14, -30 }, { 20, -27 }, yading@10: { -29, 18 }, { -16, -31 }, { -28, -22 }, { 21, -30 }, { -25, 28 }, { 26, -29 }, { 25, -32 }, { -32, -32 } yading@10: }; yading@10: yading@10: /* This is simply the scaled down elementwise product of the standard JPEG yading@10: * quantizer table and the AAN premul table. */ yading@10: static const uint8_t dequant_table[64] = { yading@10: 16, 15, 13, 19, 24, 31, 28, 17, yading@10: 17, 23, 25, 31, 36, 63, 45, 21, yading@10: 18, 24, 27, 37, 52, 59, 49, 20, yading@10: 16, 28, 34, 40, 60, 80, 51, 20, yading@10: 18, 31, 48, 66, 68, 86, 56, 21, yading@10: 19, 38, 56, 59, 64, 64, 48, 20, yading@10: 27, 48, 55, 55, 56, 51, 35, 15, yading@10: 20, 35, 34, 32, 31, 22, 15, 8, yading@10: }; yading@10: yading@10: static VLC block_type_vlc[2][4]; yading@10: yading@10: yading@10: typedef struct CFrameBuffer { yading@10: unsigned int allocated_size; yading@10: unsigned int size; yading@10: int id; yading@10: uint8_t *data; yading@10: } CFrameBuffer; yading@10: yading@10: typedef struct FourXContext { yading@10: AVCodecContext *avctx; yading@10: DSPContext dsp; yading@10: AVFrame *current_picture, *last_picture; yading@10: GetBitContext pre_gb; ///< ac/dc prefix yading@10: GetBitContext gb; yading@10: GetByteContext g; yading@10: GetByteContext g2; yading@10: int mv[256]; yading@10: VLC pre_vlc; yading@10: int last_dc; yading@10: DECLARE_ALIGNED(16, int16_t, block)[6][64]; yading@10: void *bitstream_buffer; yading@10: unsigned int bitstream_buffer_size; yading@10: int version; yading@10: CFrameBuffer cfrm[CFRAME_BUFFER_COUNT]; yading@10: } FourXContext; yading@10: yading@10: yading@10: #define FIX_1_082392200 70936 yading@10: #define FIX_1_414213562 92682 yading@10: #define FIX_1_847759065 121095 yading@10: #define FIX_2_613125930 171254 yading@10: yading@10: #define MULTIPLY(var, const) (((var) * (const)) >> 16) yading@10: yading@10: static void idct(int16_t block[64]) yading@10: { yading@10: int tmp0, tmp1, tmp2, tmp3, tmp4, tmp5, tmp6, tmp7; yading@10: int tmp10, tmp11, tmp12, tmp13; yading@10: int z5, z10, z11, z12, z13; yading@10: int i; yading@10: int temp[64]; yading@10: yading@10: for (i = 0; i < 8; i++) { yading@10: tmp10 = block[8 * 0 + i] + block[8 * 4 + i]; yading@10: tmp11 = block[8 * 0 + i] - block[8 * 4 + i]; yading@10: yading@10: tmp13 = block[8 * 2 + i] + block[8 * 6 + i]; yading@10: tmp12 = MULTIPLY(block[8 * 2 + i] - block[8 * 6 + i], FIX_1_414213562) - tmp13; yading@10: yading@10: tmp0 = tmp10 + tmp13; yading@10: tmp3 = tmp10 - tmp13; yading@10: tmp1 = tmp11 + tmp12; yading@10: tmp2 = tmp11 - tmp12; yading@10: yading@10: z13 = block[8 * 5 + i] + block[8 * 3 + i]; yading@10: z10 = block[8 * 5 + i] - block[8 * 3 + i]; yading@10: z11 = block[8 * 1 + i] + block[8 * 7 + i]; yading@10: z12 = block[8 * 1 + i] - block[8 * 7 + i]; yading@10: yading@10: tmp7 = z11 + z13; yading@10: tmp11 = MULTIPLY(z11 - z13, FIX_1_414213562); yading@10: yading@10: z5 = MULTIPLY(z10 + z12, FIX_1_847759065); yading@10: tmp10 = MULTIPLY(z12, FIX_1_082392200) - z5; yading@10: tmp12 = MULTIPLY(z10, -FIX_2_613125930) + z5; yading@10: yading@10: tmp6 = tmp12 - tmp7; yading@10: tmp5 = tmp11 - tmp6; yading@10: tmp4 = tmp10 + tmp5; yading@10: yading@10: temp[8 * 0 + i] = tmp0 + tmp7; yading@10: temp[8 * 7 + i] = tmp0 - tmp7; yading@10: temp[8 * 1 + i] = tmp1 + tmp6; yading@10: temp[8 * 6 + i] = tmp1 - tmp6; yading@10: temp[8 * 2 + i] = tmp2 + tmp5; yading@10: temp[8 * 5 + i] = tmp2 - tmp5; yading@10: temp[8 * 4 + i] = tmp3 + tmp4; yading@10: temp[8 * 3 + i] = tmp3 - tmp4; yading@10: } yading@10: yading@10: for (i = 0; i < 8 * 8; i += 8) { yading@10: tmp10 = temp[0 + i] + temp[4 + i]; yading@10: tmp11 = temp[0 + i] - temp[4 + i]; yading@10: yading@10: tmp13 = temp[2 + i] + temp[6 + i]; yading@10: tmp12 = MULTIPLY(temp[2 + i] - temp[6 + i], FIX_1_414213562) - tmp13; yading@10: yading@10: tmp0 = tmp10 + tmp13; yading@10: tmp3 = tmp10 - tmp13; yading@10: tmp1 = tmp11 + tmp12; yading@10: tmp2 = tmp11 - tmp12; yading@10: yading@10: z13 = temp[5 + i] + temp[3 + i]; yading@10: z10 = temp[5 + i] - temp[3 + i]; yading@10: z11 = temp[1 + i] + temp[7 + i]; yading@10: z12 = temp[1 + i] - temp[7 + i]; yading@10: yading@10: tmp7 = z11 + z13; yading@10: tmp11 = MULTIPLY(z11 - z13, FIX_1_414213562); yading@10: yading@10: z5 = MULTIPLY(z10 + z12, FIX_1_847759065); yading@10: tmp10 = MULTIPLY(z12, FIX_1_082392200) - z5; yading@10: tmp12 = MULTIPLY(z10, -FIX_2_613125930) + z5; yading@10: yading@10: tmp6 = tmp12 - tmp7; yading@10: tmp5 = tmp11 - tmp6; yading@10: tmp4 = tmp10 + tmp5; yading@10: yading@10: block[0 + i] = (tmp0 + tmp7) >> 6; yading@10: block[7 + i] = (tmp0 - tmp7) >> 6; yading@10: block[1 + i] = (tmp1 + tmp6) >> 6; yading@10: block[6 + i] = (tmp1 - tmp6) >> 6; yading@10: block[2 + i] = (tmp2 + tmp5) >> 6; yading@10: block[5 + i] = (tmp2 - tmp5) >> 6; yading@10: block[4 + i] = (tmp3 + tmp4) >> 6; yading@10: block[3 + i] = (tmp3 - tmp4) >> 6; yading@10: } yading@10: } yading@10: yading@10: static av_cold void init_vlcs(FourXContext *f) yading@10: { yading@10: static VLC_TYPE table[2][4][32][2]; yading@10: int i, j; yading@10: yading@10: for (i = 0; i < 2; i++) { yading@10: for (j = 0; j < 4; j++) { yading@10: block_type_vlc[i][j].table = table[i][j]; yading@10: block_type_vlc[i][j].table_allocated = 32; yading@10: init_vlc(&block_type_vlc[i][j], BLOCK_TYPE_VLC_BITS, 7, yading@10: &block_type_tab[i][j][0][1], 2, 1, yading@10: &block_type_tab[i][j][0][0], 2, 1, yading@10: INIT_VLC_USE_NEW_STATIC); yading@10: } yading@10: } yading@10: } yading@10: yading@10: static void init_mv(FourXContext *f, int linesize) yading@10: { yading@10: int i; yading@10: yading@10: for (i = 0; i < 256; i++) { yading@10: if (f->version > 1) yading@10: f->mv[i] = mv[i][0] + mv[i][1] * linesize / 2; yading@10: else yading@10: f->mv[i] = (i & 15) - 8 + ((i >> 4) - 8) * linesize / 2; yading@10: } yading@10: } yading@10: yading@10: #if HAVE_BIGENDIAN yading@10: #define LE_CENTRIC_MUL(dst, src, scale, dc) \ yading@10: { \ yading@10: unsigned tmpval = AV_RN32(src); \ yading@10: tmpval = (tmpval << 16) | (tmpval >> 16); \ yading@10: tmpval = tmpval * (scale) + (dc); \ yading@10: tmpval = (tmpval << 16) | (tmpval >> 16); \ yading@10: AV_WN32A(dst, tmpval); \ yading@10: } yading@10: #else yading@10: #define LE_CENTRIC_MUL(dst, src, scale, dc) \ yading@10: { \ yading@10: unsigned tmpval = AV_RN32(src) * (scale) + (dc); \ yading@10: AV_WN32A(dst, tmpval); \ yading@10: } yading@10: #endif yading@10: yading@10: static inline void mcdc(uint16_t *dst, const uint16_t *src, int log2w, yading@10: int h, int stride, int scale, unsigned dc) yading@10: { yading@10: int i; yading@10: dc *= 0x10001; yading@10: yading@10: switch (log2w) { yading@10: case 0: yading@10: for (i = 0; i < h; i++) { yading@10: dst[0] = scale * src[0] + dc; yading@10: if (scale) yading@10: src += stride; yading@10: dst += stride; yading@10: } yading@10: break; yading@10: case 1: yading@10: for (i = 0; i < h; i++) { yading@10: LE_CENTRIC_MUL(dst, src, scale, dc); yading@10: if (scale) yading@10: src += stride; yading@10: dst += stride; yading@10: } yading@10: break; yading@10: case 2: yading@10: for (i = 0; i < h; i++) { yading@10: LE_CENTRIC_MUL(dst, src, scale, dc); yading@10: LE_CENTRIC_MUL(dst + 2, src + 2, scale, dc); yading@10: if (scale) yading@10: src += stride; yading@10: dst += stride; yading@10: } yading@10: break; yading@10: case 3: yading@10: for (i = 0; i < h; i++) { yading@10: LE_CENTRIC_MUL(dst, src, scale, dc); yading@10: LE_CENTRIC_MUL(dst + 2, src + 2, scale, dc); yading@10: LE_CENTRIC_MUL(dst + 4, src + 4, scale, dc); yading@10: LE_CENTRIC_MUL(dst + 6, src + 6, scale, dc); yading@10: if (scale) yading@10: src += stride; yading@10: dst += stride; yading@10: } yading@10: break; yading@10: default: yading@10: av_assert2(0); yading@10: } yading@10: } yading@10: yading@10: static void decode_p_block(FourXContext *f, uint16_t *dst, uint16_t *src, yading@10: int log2w, int log2h, int stride) yading@10: { yading@10: const int index = size2index[log2h][log2w]; yading@10: const int h = 1 << log2h; yading@10: int code = get_vlc2(&f->gb, yading@10: block_type_vlc[1 - (f->version > 1)][index].table, yading@10: BLOCK_TYPE_VLC_BITS, 1); yading@10: uint16_t *start = (uint16_t *)f->last_picture->data[0]; yading@10: uint16_t *end = start + stride * (f->avctx->height - h + 1) - (1 << log2w); yading@10: yading@10: av_assert2(code >= 0 && code <= 6); yading@10: yading@10: if (code == 0) { yading@10: if (bytestream2_get_bytes_left(&f->g) < 1) { yading@10: av_log(f->avctx, AV_LOG_ERROR, "bytestream overread\n"); yading@10: return; yading@10: } yading@10: src += f->mv[bytestream2_get_byteu(&f->g)]; yading@10: if (start > src || src > end) { yading@10: av_log(f->avctx, AV_LOG_ERROR, "mv out of pic\n"); yading@10: return; yading@10: } yading@10: mcdc(dst, src, log2w, h, stride, 1, 0); yading@10: } else if (code == 1) { yading@10: log2h--; yading@10: decode_p_block(f, dst, src, log2w, log2h, stride); yading@10: decode_p_block(f, dst + (stride << log2h), yading@10: src + (stride << log2h), log2w, log2h, stride); yading@10: } else if (code == 2) { yading@10: log2w--; yading@10: decode_p_block(f, dst , src, log2w, log2h, stride); yading@10: decode_p_block(f, dst + (1 << log2w), yading@10: src + (1 << log2w), log2w, log2h, stride); yading@10: } else if (code == 3 && f->version < 2) { yading@10: mcdc(dst, src, log2w, h, stride, 1, 0); yading@10: } else if (code == 4) { yading@10: if (bytestream2_get_bytes_left(&f->g) < 1) { yading@10: av_log(f->avctx, AV_LOG_ERROR, "bytestream overread\n"); yading@10: return; yading@10: } yading@10: src += f->mv[bytestream2_get_byteu(&f->g)]; yading@10: if (start > src || src > end) { yading@10: av_log(f->avctx, AV_LOG_ERROR, "mv out of pic\n"); yading@10: return; yading@10: } yading@10: if (bytestream2_get_bytes_left(&f->g2) < 2){ yading@10: av_log(f->avctx, AV_LOG_ERROR, "wordstream overread\n"); yading@10: return; yading@10: } yading@10: mcdc(dst, src, log2w, h, stride, 1, bytestream2_get_le16u(&f->g2)); yading@10: } else if (code == 5) { yading@10: if (bytestream2_get_bytes_left(&f->g2) < 2) { yading@10: av_log(f->avctx, AV_LOG_ERROR, "wordstream overread\n"); yading@10: return; yading@10: } yading@10: mcdc(dst, src, log2w, h, stride, 0, bytestream2_get_le16u(&f->g2)); yading@10: } else if (code == 6) { yading@10: if (bytestream2_get_bytes_left(&f->g2) < 4) { yading@10: av_log(f->avctx, AV_LOG_ERROR, "wordstream overread\n"); yading@10: return; yading@10: } yading@10: if (log2w) { yading@10: dst[0] = bytestream2_get_le16u(&f->g2); yading@10: dst[1] = bytestream2_get_le16u(&f->g2); yading@10: } else { yading@10: dst[0] = bytestream2_get_le16u(&f->g2); yading@10: dst[stride] = bytestream2_get_le16u(&f->g2); yading@10: } yading@10: } yading@10: } yading@10: yading@10: static int decode_p_frame(FourXContext *f, AVFrame *frame, yading@10: const uint8_t *buf, int length) yading@10: { yading@10: int x, y; yading@10: const int width = f->avctx->width; yading@10: const int height = f->avctx->height; yading@10: uint16_t *src = (uint16_t *)f->last_picture->data[0]; yading@10: uint16_t *dst = (uint16_t *)frame->data[0]; yading@10: const int stride = frame->linesize[0] >> 1; yading@10: unsigned int bitstream_size, bytestream_size, wordstream_size, extra, yading@10: bytestream_offset, wordstream_offset; yading@10: yading@10: if (f->version > 1) { yading@10: extra = 20; yading@10: if (length < extra) yading@10: return -1; yading@10: bitstream_size = AV_RL32(buf + 8); yading@10: wordstream_size = AV_RL32(buf + 12); yading@10: bytestream_size = AV_RL32(buf + 16); yading@10: } else { yading@10: extra = 0; yading@10: bitstream_size = AV_RL16(buf - 4); yading@10: wordstream_size = AV_RL16(buf - 2); yading@10: bytestream_size = FFMAX(length - bitstream_size - wordstream_size, 0); yading@10: } yading@10: yading@10: if (bitstream_size > length || bitstream_size >= INT_MAX/8 || yading@10: bytestream_size > length - bitstream_size || yading@10: wordstream_size > length - bytestream_size - bitstream_size || yading@10: extra > length - bytestream_size - bitstream_size - wordstream_size) { yading@10: av_log(f->avctx, AV_LOG_ERROR, "lengths %d %d %d %d\n", bitstream_size, bytestream_size, wordstream_size, yading@10: bitstream_size+ bytestream_size+ wordstream_size - length); yading@10: return AVERROR_INVALIDDATA; yading@10: } yading@10: yading@10: av_fast_malloc(&f->bitstream_buffer, &f->bitstream_buffer_size, yading@10: bitstream_size + FF_INPUT_BUFFER_PADDING_SIZE); yading@10: if (!f->bitstream_buffer) yading@10: return AVERROR(ENOMEM); yading@10: f->dsp.bswap_buf(f->bitstream_buffer, (const uint32_t*)(buf + extra), yading@10: bitstream_size / 4); yading@10: memset((uint8_t*)f->bitstream_buffer + bitstream_size, yading@10: 0, FF_INPUT_BUFFER_PADDING_SIZE); yading@10: init_get_bits(&f->gb, f->bitstream_buffer, 8 * bitstream_size); yading@10: yading@10: wordstream_offset = extra + bitstream_size; yading@10: bytestream_offset = extra + bitstream_size + wordstream_size; yading@10: bytestream2_init(&f->g2, buf + wordstream_offset, yading@10: length - wordstream_offset); yading@10: bytestream2_init(&f->g, buf + bytestream_offset, yading@10: length - bytestream_offset); yading@10: yading@10: init_mv(f, frame->linesize[0]); yading@10: yading@10: for (y = 0; y < height; y += 8) { yading@10: for (x = 0; x < width; x += 8) yading@10: decode_p_block(f, dst + x, src + x, 3, 3, stride); yading@10: src += 8 * stride; yading@10: dst += 8 * stride; yading@10: } yading@10: yading@10: return 0; yading@10: } yading@10: yading@10: /** yading@10: * decode block and dequantize. yading@10: * Note this is almost identical to MJPEG. yading@10: */ yading@10: static int decode_i_block(FourXContext *f, int16_t *block) yading@10: { yading@10: int code, i, j, level, val; yading@10: yading@10: if (get_bits_left(&f->gb) < 2){ yading@10: av_log(f->avctx, AV_LOG_ERROR, "%d bits left before decode_i_block()\n", get_bits_left(&f->gb)); yading@10: return -1; yading@10: } yading@10: yading@10: /* DC coef */ yading@10: val = get_vlc2(&f->pre_gb, f->pre_vlc.table, ACDC_VLC_BITS, 3); yading@10: if (val >> 4) yading@10: av_log(f->avctx, AV_LOG_ERROR, "error dc run != 0\n"); yading@10: yading@10: if (val) yading@10: val = get_xbits(&f->gb, val); yading@10: yading@10: val = val * dequant_table[0] + f->last_dc; yading@10: f->last_dc = block[0] = val; yading@10: /* AC coefs */ yading@10: i = 1; yading@10: for (;;) { yading@10: code = get_vlc2(&f->pre_gb, f->pre_vlc.table, ACDC_VLC_BITS, 3); yading@10: yading@10: /* EOB */ yading@10: if (code == 0) yading@10: break; yading@10: if (code == 0xf0) { yading@10: i += 16; yading@10: } else { yading@10: level = get_xbits(&f->gb, code & 0xf); yading@10: i += code >> 4; yading@10: if (i >= 64) { yading@10: av_log(f->avctx, AV_LOG_ERROR, "run %d oveflow\n", i); yading@10: return 0; yading@10: } yading@10: yading@10: j = ff_zigzag_direct[i]; yading@10: block[j] = level * dequant_table[j]; yading@10: i++; yading@10: if (i >= 64) yading@10: break; yading@10: } yading@10: } yading@10: yading@10: return 0; yading@10: } yading@10: yading@10: static inline void idct_put(FourXContext *f, AVFrame *frame, int x, int y) yading@10: { yading@10: int16_t (*block)[64] = f->block; yading@10: int stride = frame->linesize[0] >> 1; yading@10: int i; yading@10: uint16_t *dst = ((uint16_t*)frame->data[0]) + y * stride + x; yading@10: yading@10: for (i = 0; i < 4; i++) { yading@10: block[i][0] += 0x80 * 8 * 8; yading@10: idct(block[i]); yading@10: } yading@10: yading@10: if (!(f->avctx->flags & CODEC_FLAG_GRAY)) { yading@10: for (i = 4; i < 6; i++) yading@10: idct(block[i]); yading@10: } yading@10: yading@10: /* Note transform is: yading@10: * y = ( 1b + 4g + 2r) / 14 yading@10: * cb = ( 3b - 2g - 1r) / 14 yading@10: * cr = (-1b - 4g + 5r) / 14 */ yading@10: for (y = 0; y < 8; y++) { yading@10: for (x = 0; x < 8; x++) { yading@10: int16_t *temp = block[(x >> 2) + 2 * (y >> 2)] + yading@10: 2 * (x & 3) + 2 * 8 * (y & 3); // FIXME optimize yading@10: int cb = block[4][x + 8 * y]; yading@10: int cr = block[5][x + 8 * y]; yading@10: int cg = (cb + cr) >> 1; yading@10: int y; yading@10: yading@10: cb += cb; yading@10: yading@10: y = temp[0]; yading@10: dst[0] = ((y + cb) >> 3) + (((y - cg) & 0xFC) << 3) + (((y + cr) & 0xF8) << 8); yading@10: y = temp[1]; yading@10: dst[1] = ((y + cb) >> 3) + (((y - cg) & 0xFC) << 3) + (((y + cr) & 0xF8) << 8); yading@10: y = temp[8]; yading@10: dst[stride] = ((y + cb) >> 3) + (((y - cg) & 0xFC) << 3) + (((y + cr) & 0xF8) << 8); yading@10: y = temp[9]; yading@10: dst[1 + stride] = ((y + cb) >> 3) + (((y - cg) & 0xFC) << 3) + (((y + cr) & 0xF8) << 8); yading@10: dst += 2; yading@10: } yading@10: dst += 2 * stride - 2 * 8; yading@10: } yading@10: } yading@10: yading@10: static int decode_i_mb(FourXContext *f) yading@10: { yading@10: int ret; yading@10: int i; yading@10: yading@10: f->dsp.clear_blocks(f->block[0]); yading@10: yading@10: for (i = 0; i < 6; i++) yading@10: if ((ret = decode_i_block(f, f->block[i])) < 0) yading@10: return ret; yading@10: yading@10: return 0; yading@10: } yading@10: yading@10: static const uint8_t *read_huffman_tables(FourXContext *f, yading@10: const uint8_t * const buf, int buf_size) yading@10: { yading@10: int frequency[512] = { 0 }; yading@10: uint8_t flag[512]; yading@10: int up[512]; yading@10: uint8_t len_tab[257]; yading@10: int bits_tab[257]; yading@10: int start, end; yading@10: const uint8_t *ptr = buf; yading@10: const uint8_t *ptr_end = buf + buf_size; yading@10: int j; yading@10: yading@10: memset(up, -1, sizeof(up)); yading@10: yading@10: start = *ptr++; yading@10: end = *ptr++; yading@10: for (;;) { yading@10: int i; yading@10: yading@10: if (ptr_end - ptr < FFMAX(end - start + 1, 0) + 1) { yading@10: av_log(f->avctx, AV_LOG_ERROR, "invalid data in read_huffman_tables\n"); yading@10: return NULL; yading@10: } yading@10: for (i = start; i <= end; i++) yading@10: frequency[i] = *ptr++; yading@10: start = *ptr++; yading@10: if (start == 0) yading@10: break; yading@10: yading@10: end = *ptr++; yading@10: } yading@10: frequency[256] = 1; yading@10: yading@10: while ((ptr - buf) & 3) yading@10: ptr++; // 4byte align yading@10: yading@10: if (ptr > ptr_end) { yading@10: av_log(f->avctx, AV_LOG_ERROR, "ptr overflow in read_huffman_tables\n"); yading@10: return NULL; yading@10: } yading@10: yading@10: for (j = 257; j < 512; j++) { yading@10: int min_freq[2] = { 256 * 256, 256 * 256 }; yading@10: int smallest[2] = { 0, 0 }; yading@10: int i; yading@10: for (i = 0; i < j; i++) { yading@10: if (frequency[i] == 0) yading@10: continue; yading@10: if (frequency[i] < min_freq[1]) { yading@10: if (frequency[i] < min_freq[0]) { yading@10: min_freq[1] = min_freq[0]; yading@10: smallest[1] = smallest[0]; yading@10: min_freq[0] = frequency[i]; yading@10: smallest[0] = i; yading@10: } else { yading@10: min_freq[1] = frequency[i]; yading@10: smallest[1] = i; yading@10: } yading@10: } yading@10: } yading@10: if (min_freq[1] == 256 * 256) yading@10: break; yading@10: yading@10: frequency[j] = min_freq[0] + min_freq[1]; yading@10: flag[smallest[0]] = 0; yading@10: flag[smallest[1]] = 1; yading@10: up[smallest[0]] = yading@10: up[smallest[1]] = j; yading@10: frequency[smallest[0]] = frequency[smallest[1]] = 0; yading@10: } yading@10: yading@10: for (j = 0; j < 257; j++) { yading@10: int node, len = 0, bits = 0; yading@10: yading@10: for (node = j; up[node] != -1; node = up[node]) { yading@10: bits += flag[node] << len; yading@10: len++; yading@10: if (len > 31) yading@10: // can this happen at all ? yading@10: av_log(f->avctx, AV_LOG_ERROR, yading@10: "vlc length overflow\n"); yading@10: } yading@10: yading@10: bits_tab[j] = bits; yading@10: len_tab[j] = len; yading@10: } yading@10: yading@10: if (init_vlc(&f->pre_vlc, ACDC_VLC_BITS, 257, len_tab, 1, 1, yading@10: bits_tab, 4, 4, 0)) yading@10: return NULL; yading@10: yading@10: return ptr; yading@10: } yading@10: yading@10: static int mix(int c0, int c1) yading@10: { yading@10: int blue = 2 * (c0 & 0x001F) + (c1 & 0x001F); yading@10: int green = (2 * (c0 & 0x03E0) + (c1 & 0x03E0)) >> 5; yading@10: int red = 2 * (c0 >> 10) + (c1 >> 10); yading@10: return red / 3 * 1024 + green / 3 * 32 + blue / 3; yading@10: } yading@10: yading@10: static int decode_i2_frame(FourXContext *f, AVFrame *frame, const uint8_t *buf, int length) yading@10: { yading@10: int x, y, x2, y2; yading@10: const int width = f->avctx->width; yading@10: const int height = f->avctx->height; yading@10: const int mbs = (FFALIGN(width, 16) >> 4) * (FFALIGN(height, 16) >> 4); yading@10: uint16_t *dst = (uint16_t*)frame->data[0]; yading@10: const int stride = frame->linesize[0]>>1; yading@10: const uint8_t *buf_end = buf + length; yading@10: GetByteContext g3; yading@10: yading@10: if (length < mbs * 8) { yading@10: av_log(f->avctx, AV_LOG_ERROR, "packet size too small\n"); yading@10: return AVERROR_INVALIDDATA; yading@10: } yading@10: bytestream2_init(&g3, buf, length); yading@10: yading@10: for (y = 0; y < height; y += 16) { yading@10: for (x = 0; x < width; x += 16) { yading@10: unsigned int color[4] = { 0 }, bits; yading@10: if (buf_end - buf < 8) yading@10: return -1; yading@10: // warning following is purely guessed ... yading@10: color[0] = bytestream2_get_le16u(&g3); yading@10: color[1] = bytestream2_get_le16u(&g3); yading@10: yading@10: if (color[0] & 0x8000) yading@10: av_log(NULL, AV_LOG_ERROR, "unk bit 1\n"); yading@10: if (color[1] & 0x8000) yading@10: av_log(NULL, AV_LOG_ERROR, "unk bit 2\n"); yading@10: yading@10: color[2] = mix(color[0], color[1]); yading@10: color[3] = mix(color[1], color[0]); yading@10: yading@10: bits = bytestream2_get_le32u(&g3); yading@10: for (y2 = 0; y2 < 16; y2++) { yading@10: for (x2 = 0; x2 < 16; x2++) { yading@10: int index = 2 * (x2 >> 2) + 8 * (y2 >> 2); yading@10: dst[y2 * stride + x2] = color[(bits >> index) & 3]; yading@10: } yading@10: } yading@10: dst += 16; yading@10: } yading@10: dst += 16 * stride - x; yading@10: } yading@10: yading@10: return 0; yading@10: } yading@10: yading@10: static int decode_i_frame(FourXContext *f, AVFrame *frame, const uint8_t *buf, int length) yading@10: { yading@10: int x, y, ret; yading@10: const int width = f->avctx->width; yading@10: const int height = f->avctx->height; yading@10: const unsigned int bitstream_size = AV_RL32(buf); yading@10: unsigned int prestream_size; yading@10: const uint8_t *prestream; yading@10: yading@10: if (bitstream_size > (1<<26) || length < bitstream_size + 12) { yading@10: av_log(f->avctx, AV_LOG_ERROR, "packet size too small\n"); yading@10: return AVERROR_INVALIDDATA; yading@10: } yading@10: yading@10: prestream_size = 4 * AV_RL32(buf + bitstream_size + 4); yading@10: prestream = buf + bitstream_size + 12; yading@10: yading@10: if (prestream_size + bitstream_size + 12 != length yading@10: || bitstream_size > (1 << 26) yading@10: || prestream_size > (1 << 26)) { yading@10: av_log(f->avctx, AV_LOG_ERROR, "size mismatch %d %d %d\n", yading@10: prestream_size, bitstream_size, length); yading@10: return AVERROR_INVALIDDATA; yading@10: } yading@10: yading@10: prestream = read_huffman_tables(f, prestream, buf + length - prestream); yading@10: if (!prestream) { yading@10: av_log(f->avctx, AV_LOG_ERROR, "Error reading Huffman tables.\n"); yading@10: return AVERROR_INVALIDDATA; yading@10: } yading@10: yading@10: av_assert0(prestream <= buf + length); yading@10: yading@10: init_get_bits(&f->gb, buf + 4, 8 * bitstream_size); yading@10: yading@10: prestream_size = length + buf - prestream; yading@10: yading@10: av_fast_malloc(&f->bitstream_buffer, &f->bitstream_buffer_size, yading@10: prestream_size + FF_INPUT_BUFFER_PADDING_SIZE); yading@10: if (!f->bitstream_buffer) yading@10: return AVERROR(ENOMEM); yading@10: f->dsp.bswap_buf(f->bitstream_buffer, (const uint32_t*)prestream, yading@10: prestream_size / 4); yading@10: memset((uint8_t*)f->bitstream_buffer + prestream_size, yading@10: 0, FF_INPUT_BUFFER_PADDING_SIZE); yading@10: init_get_bits(&f->pre_gb, f->bitstream_buffer, 8 * prestream_size); yading@10: yading@10: f->last_dc = 0 * 128 * 8 * 8; yading@10: yading@10: for (y = 0; y < height; y += 16) { yading@10: for (x = 0; x < width; x += 16) { yading@10: if ((ret = decode_i_mb(f)) < 0) yading@10: return ret; yading@10: yading@10: idct_put(f, frame, x, y); yading@10: } yading@10: } yading@10: yading@10: if (get_vlc2(&f->pre_gb, f->pre_vlc.table, ACDC_VLC_BITS, 3) != 256) yading@10: av_log(f->avctx, AV_LOG_ERROR, "end mismatch\n"); yading@10: yading@10: return 0; yading@10: } yading@10: yading@10: static int decode_frame(AVCodecContext *avctx, void *data, yading@10: int *got_frame, AVPacket *avpkt) yading@10: { yading@10: const uint8_t *buf = avpkt->data; yading@10: int buf_size = avpkt->size; yading@10: FourXContext *const f = avctx->priv_data; yading@10: AVFrame *picture = data; yading@10: int i, frame_4cc, frame_size, ret; yading@10: yading@10: if (buf_size < 12) yading@10: return AVERROR_INVALIDDATA; yading@10: frame_4cc = AV_RL32(buf); yading@10: if (buf_size != AV_RL32(buf + 4) + 8 || buf_size < 20) yading@10: av_log(f->avctx, AV_LOG_ERROR, "size mismatch %d %d\n", yading@10: buf_size, AV_RL32(buf + 4)); yading@10: yading@10: if (frame_4cc == AV_RL32("cfrm")) { yading@10: int free_index = -1; yading@10: const int data_size = buf_size - 20; yading@10: const int id = AV_RL32(buf + 12); yading@10: const int whole_size = AV_RL32(buf + 16); yading@10: CFrameBuffer *cfrm; yading@10: yading@10: if (data_size < 0 || whole_size < 0) { yading@10: av_log(f->avctx, AV_LOG_ERROR, "sizes invalid\n"); yading@10: return AVERROR_INVALIDDATA; yading@10: } yading@10: yading@10: if (f->version <= 1) { yading@10: av_log(f->avctx, AV_LOG_ERROR, "cfrm in version %d\n", f->version); yading@10: return AVERROR_INVALIDDATA; yading@10: } yading@10: yading@10: for (i = 0; i < CFRAME_BUFFER_COUNT; i++) yading@10: if (f->cfrm[i].id && f->cfrm[i].id < avctx->frame_number) yading@10: av_log(f->avctx, AV_LOG_ERROR, "lost c frame %d\n", yading@10: f->cfrm[i].id); yading@10: yading@10: for (i = 0; i < CFRAME_BUFFER_COUNT; i++) { yading@10: if (f->cfrm[i].id == id) yading@10: break; yading@10: if (f->cfrm[i].size == 0) yading@10: free_index = i; yading@10: } yading@10: yading@10: if (i >= CFRAME_BUFFER_COUNT) { yading@10: i = free_index; yading@10: f->cfrm[i].id = id; yading@10: } yading@10: cfrm = &f->cfrm[i]; yading@10: yading@10: if (data_size > UINT_MAX - cfrm->size - FF_INPUT_BUFFER_PADDING_SIZE) yading@10: return AVERROR_INVALIDDATA; yading@10: yading@10: cfrm->data = av_fast_realloc(cfrm->data, &cfrm->allocated_size, yading@10: cfrm->size + data_size + FF_INPUT_BUFFER_PADDING_SIZE); yading@10: // explicit check needed as memcpy below might not catch a NULL yading@10: if (!cfrm->data) { yading@10: av_log(f->avctx, AV_LOG_ERROR, "realloc failure\n"); yading@10: return AVERROR(ENOMEM); yading@10: } yading@10: yading@10: memcpy(cfrm->data + cfrm->size, buf + 20, data_size); yading@10: cfrm->size += data_size; yading@10: yading@10: if (cfrm->size >= whole_size) { yading@10: buf = cfrm->data; yading@10: frame_size = cfrm->size; yading@10: yading@10: if (id != avctx->frame_number) yading@10: av_log(f->avctx, AV_LOG_ERROR, "cframe id mismatch %d %d\n", yading@10: id, avctx->frame_number); yading@10: yading@10: cfrm->size = cfrm->id = 0; yading@10: frame_4cc = AV_RL32("pfrm"); yading@10: } else yading@10: return buf_size; yading@10: } else { yading@10: buf = buf + 12; yading@10: frame_size = buf_size - 12; yading@10: } yading@10: yading@10: FFSWAP(AVFrame*, f->current_picture, f->last_picture); yading@10: yading@10: // alternatively we would have to use our own buffer management yading@10: avctx->flags |= CODEC_FLAG_EMU_EDGE; yading@10: yading@10: if ((ret = ff_reget_buffer(avctx, f->current_picture)) < 0) yading@10: return ret; yading@10: yading@10: if (frame_4cc == AV_RL32("ifr2")) { yading@10: f->current_picture->pict_type = AV_PICTURE_TYPE_I; yading@10: if ((ret = decode_i2_frame(f, f->current_picture, buf - 4, frame_size + 4)) < 0) { yading@10: av_log(f->avctx, AV_LOG_ERROR, "decode i2 frame failed\n"); yading@10: return ret; yading@10: } yading@10: } else if (frame_4cc == AV_RL32("ifrm")) { yading@10: f->current_picture->pict_type = AV_PICTURE_TYPE_I; yading@10: if ((ret = decode_i_frame(f, f->current_picture, buf, frame_size)) < 0) { yading@10: av_log(f->avctx, AV_LOG_ERROR, "decode i frame failed\n"); yading@10: return ret; yading@10: } yading@10: } else if (frame_4cc == AV_RL32("pfrm") || frame_4cc == AV_RL32("pfr2")) { yading@10: if (!f->last_picture->data[0]) { yading@10: if ((ret = ff_get_buffer(avctx, f->last_picture, yading@10: AV_GET_BUFFER_FLAG_REF)) < 0) yading@10: return ret; yading@10: for (i=0; iheight; i++) yading@10: memset(f->last_picture->data[0] + i*f->last_picture->linesize[0], 0, 2*avctx->width); yading@10: } yading@10: yading@10: f->current_picture->pict_type = AV_PICTURE_TYPE_P; yading@10: if ((ret = decode_p_frame(f, f->current_picture, buf, frame_size)) < 0) { yading@10: av_log(f->avctx, AV_LOG_ERROR, "decode p frame failed\n"); yading@10: return ret; yading@10: } yading@10: } else if (frame_4cc == AV_RL32("snd_")) { yading@10: av_log(avctx, AV_LOG_ERROR, "ignoring snd_ chunk length:%d\n", yading@10: buf_size); yading@10: } else { yading@10: av_log(avctx, AV_LOG_ERROR, "ignoring unknown chunk length:%d\n", yading@10: buf_size); yading@10: } yading@10: yading@10: f->current_picture->key_frame = f->current_picture->pict_type == AV_PICTURE_TYPE_I; yading@10: yading@10: if ((ret = av_frame_ref(picture, f->current_picture)) < 0) yading@10: return ret; yading@10: *got_frame = 1; yading@10: yading@10: emms_c(); yading@10: yading@10: return buf_size; yading@10: } yading@10: yading@10: static av_cold int decode_init(AVCodecContext *avctx) yading@10: { yading@10: FourXContext * const f = avctx->priv_data; yading@10: yading@10: if (avctx->extradata_size != 4 || !avctx->extradata) { yading@10: av_log(avctx, AV_LOG_ERROR, "extradata wrong or missing\n"); yading@10: return AVERROR_INVALIDDATA; yading@10: } yading@10: if((avctx->width % 16) || (avctx->height % 16)) { yading@10: av_log(avctx, AV_LOG_ERROR, "unsupported width/height\n"); yading@10: return AVERROR_INVALIDDATA; yading@10: } yading@10: yading@10: f->version = AV_RL32(avctx->extradata) >> 16; yading@10: ff_dsputil_init(&f->dsp, avctx); yading@10: f->avctx = avctx; yading@10: init_vlcs(f); yading@10: yading@10: if (f->version > 2) yading@10: avctx->pix_fmt = AV_PIX_FMT_RGB565; yading@10: else yading@10: avctx->pix_fmt = AV_PIX_FMT_BGR555; yading@10: yading@10: f->current_picture = av_frame_alloc(); yading@10: f->last_picture = av_frame_alloc(); yading@10: if (!f->current_picture || !f->last_picture) yading@10: return AVERROR(ENOMEM); yading@10: yading@10: return 0; yading@10: } yading@10: yading@10: yading@10: static av_cold int decode_end(AVCodecContext *avctx) yading@10: { yading@10: FourXContext * const f = avctx->priv_data; yading@10: int i; yading@10: yading@10: av_freep(&f->bitstream_buffer); yading@10: f->bitstream_buffer_size = 0; yading@10: for (i = 0; i < CFRAME_BUFFER_COUNT; i++) { yading@10: av_freep(&f->cfrm[i].data); yading@10: f->cfrm[i].allocated_size = 0; yading@10: } yading@10: ff_free_vlc(&f->pre_vlc); yading@10: av_frame_free(&f->current_picture); yading@10: av_frame_free(&f->last_picture); yading@10: yading@10: return 0; yading@10: } yading@10: yading@10: AVCodec ff_fourxm_decoder = { yading@10: .name = "4xm", yading@10: .type = AVMEDIA_TYPE_VIDEO, yading@10: .id = AV_CODEC_ID_4XM, yading@10: .priv_data_size = sizeof(FourXContext), yading@10: .init = decode_init, yading@10: .close = decode_end, yading@10: .decode = decode_frame, yading@10: .capabilities = CODEC_CAP_DR1, yading@10: .long_name = NULL_IF_CONFIG_SMALL("4X Movie"), yading@10: };