| /* |
| * 4XM codec |
| * Copyright (c) 2003 Michael Niedermayer |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * FFmpeg is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with FFmpeg; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| /** |
| * @file |
| * 4XM codec. |
| */ |
| |
| #include <inttypes.h> |
| |
| #include "libavutil/avassert.h" |
| #include "libavutil/frame.h" |
| #include "libavutil/imgutils.h" |
| #include "libavutil/intreadwrite.h" |
| #include "libavutil/mem_internal.h" |
| #include "avcodec.h" |
| #include "blockdsp.h" |
| #include "bswapdsp.h" |
| #include "bytestream.h" |
| #include "get_bits.h" |
| #include "internal.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 } x 1 |
| { 0, 1 }, { 0, 0 }, { 2, 2 }, { 6, 3 }, { 14, 4 }, { 15, 4 }, { 0, 0 } |
| }, { // 1 x { 8, 4 } |
| { 0, 1 }, { 2, 2 }, { 0, 0 }, { 6, 3 }, { 14, 4 }, { 15, 4 }, { 0, 0 } |
| }, { // 1 x 2, 2 x 1 |
| { 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 } x 1 |
| { 1, 2 }, { 0, 0 }, { 2, 2 }, { 0, 2 }, { 6, 3 }, { 7, 3 }, { 0, 0 } |
| }, {// 1 x { 8, 4 } |
| { 1, 2 }, { 2, 2 }, { 0, 0 }, { 0, 2 }, { 6, 3 }, { 7, 3 }, { 0, 0 } |
| }, {// 1 x 2, 2 x 1 |
| { 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; |
| BlockDSPContext bdsp; |
| BswapDSPContext bbdsp; |
| uint16_t *frame_buffer; |
| uint16_t *last_frame_buffer; |
| GetBitContext pre_gb; ///< ac/dc prefix |
| GetBitContext gb; |
| GetByteContext g; |
| GetByteContext g2; |
| int mv[256]; |
| VLC pre_vlc; |
| int last_dc; |
| DECLARE_ALIGNED(32, int16_t, block)[6][64]; |
| void *bitstream_buffer; |
| unsigned int bitstream_buffer_size; |
| int version; |
| CFrameBuffer cfrm[CFRAME_BUFFER_COUNT]; |
| } FourXContext; |
| |
| |
| #define FIX_1_082392200 70936 |
| #define FIX_1_414213562 92682 |
| #define FIX_1_847759065 121095 |
| #define FIX_2_613125930 171254 |
| |
| #define MULTIPLY(var, const) ((int)((var) * (unsigned)(const)) >> 16) |
| |
| static void idct(int16_t block[64]) |
| { |
| int tmp0, tmp1, tmp2, tmp3, tmp4, tmp5, tmp6, tmp7; |
| int tmp10, tmp11, tmp12, tmp13; |
| int z5, z10, z11, z12, z13; |
| int i; |
| int temp[64]; |
| |
| for (i = 0; i < 8; i++) { |
| tmp10 = block[8 * 0 + i] + block[8 * 4 + i]; |
| tmp11 = block[8 * 0 + i] - block[8 * 4 + i]; |
| |
| tmp13 = block[8 * 2 + i] + block[8 * 6 + i]; |
| tmp12 = MULTIPLY(block[8 * 2 + i] - block[8 * 6 + i], FIX_1_414213562) - tmp13; |
| |
| tmp0 = tmp10 + tmp13; |
| tmp3 = tmp10 - tmp13; |
| tmp1 = tmp11 + tmp12; |
| tmp2 = tmp11 - tmp12; |
| |
| z13 = block[8 * 5 + i] + block[8 * 3 + i]; |
| z10 = block[8 * 5 + i] - block[8 * 3 + i]; |
| z11 = block[8 * 1 + i] + block[8 * 7 + i]; |
| z12 = block[8 * 1 + i] - block[8 * 7 + i]; |
| |
| tmp7 = z11 + z13; |
| tmp11 = MULTIPLY(z11 - z13, FIX_1_414213562); |
| |
| z5 = MULTIPLY(z10 + z12, FIX_1_847759065); |
| tmp10 = MULTIPLY(z12, FIX_1_082392200) - z5; |
| tmp12 = MULTIPLY(z10, -FIX_2_613125930) + z5; |
| |
| tmp6 = tmp12 - tmp7; |
| tmp5 = tmp11 - tmp6; |
| tmp4 = tmp10 + tmp5; |
| |
| temp[8 * 0 + i] = tmp0 + tmp7; |
| temp[8 * 7 + i] = tmp0 - tmp7; |
| temp[8 * 1 + i] = tmp1 + tmp6; |
| temp[8 * 6 + i] = tmp1 - tmp6; |
| temp[8 * 2 + i] = tmp2 + tmp5; |
| temp[8 * 5 + i] = tmp2 - tmp5; |
| temp[8 * 4 + i] = tmp3 + tmp4; |
| temp[8 * 3 + i] = tmp3 - tmp4; |
| } |
| |
| for (i = 0; i < 8 * 8; i += 8) { |
| tmp10 = temp[0 + i] + temp[4 + i]; |
| tmp11 = temp[0 + i] - temp[4 + i]; |
| |
| tmp13 = temp[2 + i] + temp[6 + i]; |
| tmp12 = MULTIPLY(temp[2 + i] - temp[6 + i], FIX_1_414213562) - tmp13; |
| |
| tmp0 = tmp10 + tmp13; |
| tmp3 = tmp10 - tmp13; |
| tmp1 = tmp11 + tmp12; |
| tmp2 = tmp11 - tmp12; |
| |
| z13 = temp[5 + i] + temp[3 + i]; |
| z10 = temp[5 + i] - temp[3 + i]; |
| z11 = temp[1 + i] + temp[7 + i]; |
| z12 = temp[1 + i] - temp[7 + i]; |
| |
| tmp7 = z11 + z13; |
| tmp11 = MULTIPLY(z11 - z13, FIX_1_414213562); |
| |
| z5 = MULTIPLY(z10 + z12, FIX_1_847759065); |
| tmp10 = MULTIPLY(z12, FIX_1_082392200) - z5; |
| tmp12 = MULTIPLY(z10, -FIX_2_613125930) + z5; |
| |
| tmp6 = tmp12 - tmp7; |
| tmp5 = tmp11 - tmp6; |
| tmp4 = tmp10 + tmp5; |
| |
| block[0 + i] = (tmp0 + tmp7) >> 6; |
| block[7 + i] = (tmp0 - tmp7) >> 6; |
| block[1 + i] = (tmp1 + tmp6) >> 6; |
| block[6 + i] = (tmp1 - tmp6) >> 6; |
| block[2 + i] = (tmp2 + tmp5) >> 6; |
| block[5 + i] = (tmp2 - tmp5) >> 6; |
| block[4 + i] = (tmp3 + tmp4) >> 6; |
| block[3 + i] = (tmp3 - tmp4) >> 6; |
| } |
| } |
| |
| static av_cold void init_vlcs(FourXContext *f) |
| { |
| static VLC_TYPE table[2][4][32][2]; |
| int i, j; |
| |
| for (i = 0; i < 2; i++) { |
| for (j = 0; j < 4; j++) { |
| block_type_vlc[i][j].table = table[i][j]; |
| block_type_vlc[i][j].table_allocated = 32; |
| init_vlc(&block_type_vlc[i][j], BLOCK_TYPE_VLC_BITS, 7, |
| &block_type_tab[i][j][0][1], 2, 1, |
| &block_type_tab[i][j][0][0], 2, 1, |
| INIT_VLC_USE_NEW_STATIC); |
| } |
| } |
| } |
| |
| static void init_mv(FourXContext *f, int linesize) |
| { |
| int i; |
| |
| for (i = 0; i < 256; i++) { |
| if (f->version > 1) |
| f->mv[i] = mv[i][0] + mv[i][1] * linesize / 2; |
| else |
| f->mv[i] = (i & 15) - 8 + ((i >> 4) - 8) * linesize / 2; |
| } |
| } |
| |
| #if HAVE_BIGENDIAN |
| #define LE_CENTRIC_MUL(dst, src, scale, dc) \ |
| { \ |
| unsigned tmpval = AV_RN32(src); \ |
| tmpval = (tmpval << 16) | (tmpval >> 16); \ |
| tmpval = tmpval * (scale) + (dc); \ |
| tmpval = (tmpval << 16) | (tmpval >> 16); \ |
| AV_WN32A(dst, tmpval); \ |
| } |
| #else |
| #define LE_CENTRIC_MUL(dst, src, scale, dc) \ |
| { \ |
| unsigned tmpval = AV_RN32(src) * (scale) + (dc); \ |
| AV_WN32A(dst, tmpval); \ |
| } |
| #endif |
| |
| static inline void mcdc(uint16_t *dst, const uint16_t *src, int log2w, |
| int h, int stride, int scale, unsigned dc) |
| { |
| int i; |
| dc *= 0x10001; |
| |
| switch (log2w) { |
| case 0: |
| for (i = 0; i < h; i++) { |
| dst[0] = scale * src[0] + dc; |
| if (scale) |
| src += stride; |
| dst += stride; |
| } |
| break; |
| case 1: |
| for (i = 0; i < h; i++) { |
| LE_CENTRIC_MUL(dst, src, scale, dc); |
| if (scale) |
| src += stride; |
| dst += stride; |
| } |
| break; |
| case 2: |
| for (i = 0; i < h; i++) { |
| LE_CENTRIC_MUL(dst, src, scale, dc); |
| LE_CENTRIC_MUL(dst + 2, src + 2, scale, dc); |
| if (scale) |
| src += stride; |
| dst += stride; |
| } |
| break; |
| case 3: |
| for (i = 0; i < h; i++) { |
| LE_CENTRIC_MUL(dst, src, scale, dc); |
| LE_CENTRIC_MUL(dst + 2, src + 2, scale, dc); |
| LE_CENTRIC_MUL(dst + 4, src + 4, scale, dc); |
| LE_CENTRIC_MUL(dst + 6, src + 6, scale, dc); |
| if (scale) |
| src += stride; |
| dst += stride; |
| } |
| break; |
| default: |
| av_assert0(0); |
| } |
| } |
| |
| static int decode_p_block(FourXContext *f, uint16_t *dst, const uint16_t *src, |
| int log2w, int log2h, int stride) |
| { |
| int index, h, code, ret, scale = 1; |
| uint16_t *start, *end; |
| unsigned dc = 0; |
| |
| av_assert0(log2w >= 0 && log2h >= 0); |
| |
| index = size2index[log2h][log2w]; |
| av_assert0(index >= 0); |
| |
| if (get_bits_left(&f->gb) < 1) |
| return AVERROR_INVALIDDATA; |
| h = 1 << log2h; |
| code = get_vlc2(&f->gb, block_type_vlc[1 - (f->version > 1)][index].table, |
| BLOCK_TYPE_VLC_BITS, 1); |
| av_assert0(code >= 0 && code <= 6); |
| |
| start = f->last_frame_buffer; |
| end = start + stride * (f->avctx->height - h + 1) - (1 << log2w); |
| |
| if (code == 1) { |
| log2h--; |
| if ((ret = decode_p_block(f, dst, src, log2w, log2h, stride)) < 0) |
| return ret; |
| return decode_p_block(f, dst + (stride << log2h), |
| src + (stride << log2h), |
| log2w, log2h, stride); |
| } else if (code == 2) { |
| log2w--; |
| if ((ret = decode_p_block(f, dst , src, log2w, log2h, stride)) < 0) |
| return ret; |
| return decode_p_block(f, dst + (1 << log2w), |
| src + (1 << log2w), |
| log2w, log2h, stride); |
| } else if (code == 6) { |
| if (bytestream2_get_bytes_left(&f->g2) < 4) { |
| av_log(f->avctx, AV_LOG_ERROR, "wordstream overread\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| if (log2w) { |
| dst[0] = bytestream2_get_le16u(&f->g2); |
| dst[1] = bytestream2_get_le16u(&f->g2); |
| } else { |
| dst[0] = bytestream2_get_le16u(&f->g2); |
| dst[stride] = bytestream2_get_le16u(&f->g2); |
| } |
| return 0; |
| } |
| |
| if ((code&3)==0 && bytestream2_get_bytes_left(&f->g) < 1) { |
| av_log(f->avctx, AV_LOG_ERROR, "bytestream overread\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| if (code == 0) { |
| src += f->mv[bytestream2_get_byte(&f->g)]; |
| } else if (code == 3 && f->version >= 2) { |
| return 0; |
| } else if (code == 4) { |
| src += f->mv[bytestream2_get_byte(&f->g)]; |
| if (bytestream2_get_bytes_left(&f->g2) < 2){ |
| av_log(f->avctx, AV_LOG_ERROR, "wordstream overread\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| dc = bytestream2_get_le16(&f->g2); |
| } else if (code == 5) { |
| if (bytestream2_get_bytes_left(&f->g2) < 2){ |
| av_log(f->avctx, AV_LOG_ERROR, "wordstream overread\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| av_assert0(start <= src && src <= end); |
| scale = 0; |
| dc = bytestream2_get_le16(&f->g2); |
| } |
| |
| if (start > src || src > end) { |
| av_log(f->avctx, AV_LOG_ERROR, "mv out of pic\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| mcdc(dst, src, log2w, h, stride, scale, dc); |
| |
| return 0; |
| } |
| |
| 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 *dst = f->frame_buffer; |
| uint16_t *src; |
| unsigned int bitstream_size, bytestream_size, wordstream_size, extra, |
| bytestream_offset, wordstream_offset; |
| int ret; |
| |
| src = f->last_frame_buffer; |
| |
| if (f->version > 1) { |
| extra = 20; |
| if (length < extra) |
| return AVERROR_INVALIDDATA; |
| 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 > length || bitstream_size >= INT_MAX/8 || |
| bytestream_size > length - bitstream_size || |
| wordstream_size > length - bytestream_size - bitstream_size || |
| extra > length - bytestream_size - bitstream_size - wordstream_size) { |
| 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 AVERROR_INVALIDDATA; |
| } |
| |
| av_fast_padded_malloc(&f->bitstream_buffer, &f->bitstream_buffer_size, |
| bitstream_size); |
| if (!f->bitstream_buffer) |
| return AVERROR(ENOMEM); |
| f->bbdsp.bswap_buf(f->bitstream_buffer, (const uint32_t *) (buf + extra), |
| bitstream_size / 4); |
| init_get_bits(&f->gb, f->bitstream_buffer, 8 * bitstream_size); |
| |
| wordstream_offset = extra + bitstream_size; |
| bytestream_offset = extra + bitstream_size + wordstream_size; |
| bytestream2_init(&f->g2, buf + wordstream_offset, |
| length - wordstream_offset); |
| bytestream2_init(&f->g, buf + bytestream_offset, |
| length - bytestream_offset); |
| |
| init_mv(f, width * 2); |
| |
| for (y = 0; y < height; y += 8) { |
| for (x = 0; x < width; x += 8) |
| if ((ret = decode_p_block(f, dst + x, src + x, 3, 3, width)) < 0) |
| return ret; |
| src += 8 * width; |
| dst += 8 * width; |
| } |
| |
| return 0; |
| } |
| |
| /** |
| * decode block and dequantize. |
| * Note this is almost identical to MJPEG. |
| */ |
| static int decode_i_block(FourXContext *f, int16_t *block) |
| { |
| int code, i, j, level, val; |
| |
| if (get_bits_left(&f->gb) < 2){ |
| av_log(f->avctx, AV_LOG_ERROR, "%d bits left before decode_i_block()\n", get_bits_left(&f->gb)); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| /* 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"); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| 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; |
| if (i >= 64) { |
| av_log(f->avctx, AV_LOG_ERROR, "run %d overflow\n", i); |
| return 0; |
| } |
| } else { |
| if (code & 0xf) { |
| level = get_xbits(&f->gb, code & 0xf); |
| } else { |
| av_log(f->avctx, AV_LOG_ERROR, "0 coeff\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| i += code >> 4; |
| if (i >= 64) { |
| av_log(f->avctx, AV_LOG_ERROR, "run %d overflow\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) |
| { |
| int16_t (*block)[64] = f->block; |
| int stride = f->avctx->width; |
| int i; |
| uint16_t *dst = f->frame_buffer + y * stride + x; |
| |
| for (i = 0; i < 4; i++) { |
| block[i][0] += 0x80 * 8 * 8; |
| idct(block[i]); |
| } |
| |
| if (!(f->avctx->flags & AV_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++) { |
| int16_t *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 ret; |
| int i; |
| |
| f->bdsp.clear_blocks(f->block[0]); |
| |
| for (i = 0; i < 6; i++) |
| if ((ret = decode_i_block(f, f->block[i])) < 0) |
| return ret; |
| |
| return 0; |
| } |
| |
| static const uint8_t *read_huffman_tables(FourXContext *f, |
| const uint8_t * const buf, |
| int buf_size) |
| { |
| int frequency[512] = { 0 }; |
| uint8_t flag[512]; |
| int up[512]; |
| uint8_t len_tab[257]; |
| int bits_tab[257]; |
| int start, end; |
| const uint8_t *ptr = buf; |
| const uint8_t *ptr_end = buf + buf_size; |
| int j; |
| |
| memset(up, -1, sizeof(up)); |
| |
| start = *ptr++; |
| end = *ptr++; |
| for (;;) { |
| int i; |
| |
| if (ptr_end - ptr < FFMAX(end - start + 1, 0) + 1) { |
| av_log(f->avctx, AV_LOG_ERROR, "invalid data in read_huffman_tables\n"); |
| return NULL; |
| } |
| |
| 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 |
| |
| if (ptr > ptr_end) { |
| av_log(f->avctx, AV_LOG_ERROR, "ptr overflow in read_huffman_tables\n"); |
| return NULL; |
| } |
| |
| 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, len = 0, bits = 0; |
| |
| for (node = j; up[node] != -1; node = up[node]) { |
| bits += flag[node] << len; |
| len++; |
| if (len > 31) |
| // can this happen at all ? |
| av_log(f->avctx, AV_LOG_ERROR, |
| "vlc length overflow\n"); |
| } |
| |
| bits_tab[j] = bits; |
| len_tab[j] = len; |
| } |
| |
| ff_free_vlc(&f->pre_vlc); |
| if (init_vlc(&f->pre_vlc, ACDC_VLC_BITS, 257, len_tab, 1, 1, |
| bits_tab, 4, 4, 0)) |
| return NULL; |
| |
| 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; |
| const int mbs = (FFALIGN(width, 16) >> 4) * (FFALIGN(height, 16) >> 4); |
| uint16_t *dst = f->frame_buffer; |
| const uint8_t *buf_end = buf + length; |
| GetByteContext g3; |
| |
| if (length < mbs * 8) { |
| av_log(f->avctx, AV_LOG_ERROR, "packet size too small\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| bytestream2_init(&g3, buf, length); |
| |
| for (y = 0; y < height; y += 16) { |
| for (x = 0; x < width; x += 16) { |
| unsigned int color[4] = { 0 }, bits; |
| if (buf_end - buf < 8) |
| return AVERROR_INVALIDDATA; |
| // warning following is purely guessed ... |
| color[0] = bytestream2_get_le16u(&g3); |
| color[1] = bytestream2_get_le16u(&g3); |
| |
| if (color[0] & 0x8000) |
| av_log(f->avctx, AV_LOG_ERROR, "unk bit 1\n"); |
| if (color[1] & 0x8000) |
| av_log(f->avctx, AV_LOG_ERROR, "unk bit 2\n"); |
| |
| color[2] = mix(color[0], color[1]); |
| color[3] = mix(color[1], color[0]); |
| |
| bits = bytestream2_get_le32u(&g3); |
| for (y2 = 0; y2 < 16; y2++) { |
| for (x2 = 0; x2 < 16; x2++) { |
| int index = 2 * (x2 >> 2) + 8 * (y2 >> 2); |
| dst[y2 * width + x2] = color[(bits >> index) & 3]; |
| } |
| } |
| dst += 16; |
| } |
| dst += 16 * width - x; |
| } |
| |
| return 0; |
| } |
| |
| static int decode_i_frame(FourXContext *f, const uint8_t *buf, int length) |
| { |
| int x, y, ret; |
| const int width = f->avctx->width; |
| const int height = f->avctx->height; |
| const unsigned int bitstream_size = AV_RL32(buf); |
| unsigned int prestream_size; |
| const uint8_t *prestream; |
| |
| if (bitstream_size > (1 << 26)) |
| return AVERROR_INVALIDDATA; |
| |
| if (length < bitstream_size + 12) { |
| av_log(f->avctx, AV_LOG_ERROR, "packet size too small\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| prestream_size = 4 * AV_RL32(buf + bitstream_size + 4); |
| prestream = buf + bitstream_size + 12; |
| |
| if (prestream_size + bitstream_size + 12 != length |
| || prestream_size > (1 << 26)) { |
| av_log(f->avctx, AV_LOG_ERROR, "size mismatch %d %d %d\n", |
| prestream_size, bitstream_size, length); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| prestream = read_huffman_tables(f, prestream, prestream_size); |
| if (!prestream) { |
| av_log(f->avctx, AV_LOG_ERROR, "Error reading Huffman tables.\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| av_assert0(prestream <= buf + length); |
| |
| init_get_bits(&f->gb, buf + 4, 8 * bitstream_size); |
| |
| prestream_size = length + buf - prestream; |
| |
| av_fast_padded_malloc(&f->bitstream_buffer, &f->bitstream_buffer_size, |
| prestream_size); |
| if (!f->bitstream_buffer) |
| return AVERROR(ENOMEM); |
| f->bbdsp.bswap_buf(f->bitstream_buffer, (const uint32_t *) prestream, |
| prestream_size / 4); |
| init_get_bits(&f->pre_gb, f->bitstream_buffer, 8 * prestream_size); |
| |
| f->last_dc = 0 * 128 * 8 * 8; |
| |
| for (y = 0; y < height; y += 16) { |
| for (x = 0; x < width; x += 16) { |
| if ((ret = decode_i_mb(f)) < 0) |
| return ret; |
| |
| idct_put(f, x, y); |
| } |
| } |
| |
| 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 *got_frame, AVPacket *avpkt) |
| { |
| const uint8_t *buf = avpkt->data; |
| int buf_size = avpkt->size; |
| FourXContext *const f = avctx->priv_data; |
| AVFrame *picture = data; |
| int i, frame_4cc, frame_size, ret; |
| |
| if (buf_size < 20) |
| return AVERROR_INVALIDDATA; |
| |
| av_assert0(avctx->width % 16 == 0 && avctx->height % 16 == 0); |
| |
| if (buf_size < AV_RL32(buf + 4) + 8) { |
| av_log(f->avctx, AV_LOG_ERROR, "size mismatch %d %"PRIu32"\n", |
| buf_size, AV_RL32(buf + 4)); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| frame_4cc = AV_RL32(buf); |
| |
| if (frame_4cc == AV_RL32("cfrm")) { |
| int free_index = -1; |
| int id, whole_size; |
| const int data_size = buf_size - 20; |
| CFrameBuffer *cfrm; |
| |
| if (f->version <= 1) { |
| av_log(f->avctx, AV_LOG_ERROR, "cfrm in version %d\n", f->version); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| id = AV_RL32(buf + 12); |
| whole_size = AV_RL32(buf + 16); |
| |
| if (data_size < 0 || whole_size < 0) { |
| av_log(f->avctx, AV_LOG_ERROR, "sizes invalid\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| 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]; |
| |
| if (data_size > UINT_MAX - cfrm->size - AV_INPUT_BUFFER_PADDING_SIZE) |
| return AVERROR_INVALIDDATA; |
| |
| cfrm->data = av_fast_realloc(cfrm->data, &cfrm->allocated_size, |
| cfrm->size + data_size + AV_INPUT_BUFFER_PADDING_SIZE); |
| // explicit check needed as memcpy below might not catch a NULL |
| if (!cfrm->data) { |
| av_log(f->avctx, AV_LOG_ERROR, "realloc failure\n"); |
| return AVERROR(ENOMEM); |
| } |
| |
| 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); |
| |
| if (f->version <= 1) |
| return AVERROR_INVALIDDATA; |
| |
| cfrm->size = cfrm->id = 0; |
| frame_4cc = AV_RL32("pfrm"); |
| } else |
| return buf_size; |
| } else { |
| buf = buf + 12; |
| frame_size = buf_size - 12; |
| } |
| |
| if ((ret = ff_get_buffer(avctx, picture, 0)) < 0) |
| return ret; |
| |
| if (frame_4cc == AV_RL32("ifr2")) { |
| picture->pict_type = AV_PICTURE_TYPE_I; |
| if ((ret = decode_i2_frame(f, buf - 4, frame_size + 4)) < 0) { |
| av_log(f->avctx, AV_LOG_ERROR, "decode i2 frame failed\n"); |
| return ret; |
| } |
| } else if (frame_4cc == AV_RL32("ifrm")) { |
| picture->pict_type = AV_PICTURE_TYPE_I; |
| if ((ret = decode_i_frame(f, buf, frame_size)) < 0) { |
| av_log(f->avctx, AV_LOG_ERROR, "decode i frame failed\n"); |
| return ret; |
| } |
| } else if (frame_4cc == AV_RL32("pfrm") || frame_4cc == AV_RL32("pfr2")) { |
| picture->pict_type = AV_PICTURE_TYPE_P; |
| if ((ret = decode_p_frame(f, buf, frame_size)) < 0) { |
| av_log(f->avctx, AV_LOG_ERROR, "decode p frame failed\n"); |
| return ret; |
| } |
| } 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); |
| } |
| |
| picture->key_frame = picture->pict_type == AV_PICTURE_TYPE_I; |
| |
| av_image_copy_plane(picture->data[0], picture->linesize[0], |
| (const uint8_t*)f->frame_buffer, avctx->width * 2, |
| avctx->width * 2, avctx->height); |
| FFSWAP(uint16_t *, f->frame_buffer, f->last_frame_buffer); |
| |
| *got_frame = 1; |
| |
| emms_c(); |
| |
| return buf_size; |
| } |
| |
| static av_cold int decode_end(AVCodecContext *avctx) |
| { |
| FourXContext * const f = avctx->priv_data; |
| int i; |
| |
| av_freep(&f->frame_buffer); |
| av_freep(&f->last_frame_buffer); |
| 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; |
| } |
| ff_free_vlc(&f->pre_vlc); |
| |
| return 0; |
| } |
| |
| static av_cold int decode_init(AVCodecContext *avctx) |
| { |
| FourXContext * const f = avctx->priv_data; |
| int ret; |
| |
| if (avctx->extradata_size != 4 || !avctx->extradata) { |
| av_log(avctx, AV_LOG_ERROR, "extradata wrong or missing\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| if((avctx->width % 16) || (avctx->height % 16)) { |
| av_log(avctx, AV_LOG_ERROR, "unsupported width/height\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| ret = av_image_check_size(avctx->width, avctx->height, 0, avctx); |
| if (ret < 0) |
| return ret; |
| |
| f->frame_buffer = av_mallocz(avctx->width * avctx->height * 2); |
| f->last_frame_buffer = av_mallocz(avctx->width * avctx->height * 2); |
| if (!f->frame_buffer || !f->last_frame_buffer) { |
| decode_end(avctx); |
| return AVERROR(ENOMEM); |
| } |
| |
| f->version = AV_RL32(avctx->extradata) >> 16; |
| ff_blockdsp_init(&f->bdsp, avctx); |
| ff_bswapdsp_init(&f->bbdsp); |
| f->avctx = avctx; |
| init_vlcs(f); |
| |
| if (f->version > 2) |
| avctx->pix_fmt = AV_PIX_FMT_RGB565; |
| else |
| avctx->pix_fmt = AV_PIX_FMT_BGR555; |
| |
| return 0; |
| } |
| |
| AVCodec ff_fourxm_decoder = { |
| .name = "4xm", |
| .long_name = NULL_IF_CONFIG_SMALL("4X Movie"), |
| .type = AVMEDIA_TYPE_VIDEO, |
| .id = AV_CODEC_ID_4XM, |
| .priv_data_size = sizeof(FourXContext), |
| .init = decode_init, |
| .close = decode_end, |
| .decode = decode_frame, |
| .capabilities = AV_CODEC_CAP_DR1, |
| }; |
