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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4349 | Serge | 1 | /* |
| 2 | * Go2Webinar decoder |
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| 3 | * Copyright (c) 2012 Konstantin Shishkov |
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| 4 | * |
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| 5 | * This file is part of FFmpeg. |
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| 6 | * |
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| 7 | * FFmpeg is free software; you can redistribute it and/or |
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| 8 | * modify it under the terms of the GNU Lesser General Public |
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| 9 | * License as published by the Free Software Foundation; either |
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| 10 | * version 2.1 of the License, or (at your option) any later version. |
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| 11 | * |
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| 12 | * FFmpeg is distributed in the hope that it will be useful, |
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| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 15 | * Lesser General Public License for more details. |
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| 16 | * |
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| 17 | * You should have received a copy of the GNU Lesser General Public |
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| 18 | * License along with FFmpeg; if not, write to the Free Software |
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| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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| 20 | */ |
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| 21 | |||
| 22 | /** |
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| 23 | * @file |
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| 24 | * Go2Webinar decoder |
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| 25 | */ |
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| 26 | |||
| 27 | #include |
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| 28 | |||
| 29 | #include "libavutil/intreadwrite.h" |
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| 30 | #include "avcodec.h" |
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| 31 | #include "bytestream.h" |
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| 32 | #include "dsputil.h" |
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| 33 | #include "get_bits.h" |
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| 34 | #include "internal.h" |
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| 35 | #include "mjpeg.h" |
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| 36 | |||
| 37 | enum ChunkType { |
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| 38 | FRAME_INFO = 0xC8, |
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| 39 | TILE_DATA, |
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| 40 | CURSOR_POS, |
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| 41 | CURSOR_SHAPE, |
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| 42 | CHUNK_CC, |
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| 43 | CHUNK_CD |
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| 44 | }; |
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| 45 | |||
| 46 | enum Compression { |
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| 47 | COMPR_EPIC_J_B = 2, |
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| 48 | COMPR_KEMPF_J_B, |
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| 49 | }; |
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| 50 | |||
| 51 | static const uint8_t luma_quant[64] = { |
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| 52 | 8, 6, 5, 8, 12, 20, 26, 31, |
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| 53 | 6, 6, 7, 10, 13, 29, 30, 28, |
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| 54 | 7, 7, 8, 12, 20, 29, 35, 28, |
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| 55 | 7, 9, 11, 15, 26, 44, 40, 31, |
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| 56 | 9, 11, 19, 28, 34, 55, 52, 39, |
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| 57 | 12, 18, 28, 32, 41, 52, 57, 46, |
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| 58 | 25, 32, 39, 44, 52, 61, 60, 51, |
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| 59 | 36, 46, 48, 49, 56, 50, 52, 50 |
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| 60 | }; |
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| 61 | |||
| 62 | static const uint8_t chroma_quant[64] = { |
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| 63 | 9, 9, 12, 24, 50, 50, 50, 50, |
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| 64 | 9, 11, 13, 33, 50, 50, 50, 50, |
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| 65 | 12, 13, 28, 50, 50, 50, 50, 50, |
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| 66 | 24, 33, 50, 50, 50, 50, 50, 50, |
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| 67 | 50, 50, 50, 50, 50, 50, 50, 50, |
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| 68 | 50, 50, 50, 50, 50, 50, 50, 50, |
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| 69 | 50, 50, 50, 50, 50, 50, 50, 50, |
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| 70 | 50, 50, 50, 50, 50, 50, 50, 50, |
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| 71 | }; |
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| 72 | |||
| 73 | typedef struct JPGContext { |
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| 74 | DSPContext dsp; |
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| 75 | ScanTable scantable; |
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| 76 | |||
| 77 | VLC dc_vlc[2], ac_vlc[2]; |
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| 78 | int prev_dc[3]; |
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| 79 | DECLARE_ALIGNED(16, int16_t, block)[6][64]; |
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| 80 | |||
| 81 | uint8_t *buf; |
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| 82 | } JPGContext; |
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| 83 | |||
| 84 | typedef struct G2MContext { |
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| 85 | JPGContext jc; |
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| 86 | int version; |
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| 87 | |||
| 88 | int compression; |
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| 89 | int width, height, bpp; |
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| 90 | int tile_width, tile_height; |
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| 91 | int tiles_x, tiles_y, tile_x, tile_y; |
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| 92 | |||
| 93 | int got_header; |
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| 94 | |||
| 95 | uint8_t *framebuf; |
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| 96 | int framebuf_stride, old_width, old_height; |
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| 97 | |||
| 98 | uint8_t *synth_tile, *jpeg_tile; |
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| 99 | int tile_stride, old_tile_w, old_tile_h; |
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| 100 | |||
| 101 | uint8_t *kempf_buf, *kempf_flags; |
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| 102 | |||
| 103 | uint8_t *cursor; |
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| 104 | int cursor_stride; |
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| 105 | int cursor_fmt; |
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| 106 | int cursor_w, cursor_h, cursor_x, cursor_y; |
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| 107 | int cursor_hot_x, cursor_hot_y; |
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| 108 | } G2MContext; |
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| 109 | |||
| 110 | static av_cold int build_vlc(VLC *vlc, const uint8_t *bits_table, |
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| 111 | const uint8_t *val_table, int nb_codes, |
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| 112 | int is_ac) |
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| 113 | { |
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| 114 | uint8_t huff_size[256] = { 0 }; |
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| 115 | uint16_t huff_code[256]; |
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| 116 | uint16_t huff_sym[256]; |
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| 117 | int i; |
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| 118 | |||
| 119 | ff_mjpeg_build_huffman_codes(huff_size, huff_code, bits_table, val_table); |
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| 120 | |||
| 121 | for (i = 0; i < 256; i++) |
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| 122 | huff_sym[i] = i + 16 * is_ac; |
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| 123 | |||
| 124 | if (is_ac) |
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| 125 | huff_sym[0] = 16 * 256; |
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| 126 | |||
| 127 | return ff_init_vlc_sparse(vlc, 9, nb_codes, huff_size, 1, 1, |
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| 128 | huff_code, 2, 2, huff_sym, 2, 2, 0); |
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| 129 | } |
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| 130 | |||
| 131 | static av_cold int jpg_init(AVCodecContext *avctx, JPGContext *c) |
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| 132 | { |
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| 133 | int ret; |
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| 134 | |||
| 135 | ret = build_vlc(&c->dc_vlc[0], avpriv_mjpeg_bits_dc_luminance, |
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| 136 | avpriv_mjpeg_val_dc, 12, 0); |
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| 137 | if (ret) |
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| 138 | return ret; |
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| 139 | ret = build_vlc(&c->dc_vlc[1], avpriv_mjpeg_bits_dc_chrominance, |
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| 140 | avpriv_mjpeg_val_dc, 12, 0); |
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| 141 | if (ret) |
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| 142 | return ret; |
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| 143 | ret = build_vlc(&c->ac_vlc[0], avpriv_mjpeg_bits_ac_luminance, |
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| 144 | avpriv_mjpeg_val_ac_luminance, 251, 1); |
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| 145 | if (ret) |
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| 146 | return ret; |
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| 147 | ret = build_vlc(&c->ac_vlc[1], avpriv_mjpeg_bits_ac_chrominance, |
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| 148 | avpriv_mjpeg_val_ac_chrominance, 251, 1); |
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| 149 | if (ret) |
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| 150 | return ret; |
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| 151 | |||
| 152 | ff_dsputil_init(&c->dsp, avctx); |
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| 153 | ff_init_scantable(c->dsp.idct_permutation, &c->scantable, |
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| 154 | ff_zigzag_direct); |
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| 155 | |||
| 156 | return 0; |
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| 157 | } |
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| 158 | |||
| 159 | static av_cold void jpg_free_context(JPGContext *ctx) |
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| 160 | { |
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| 161 | int i; |
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| 162 | |||
| 163 | for (i = 0; i < 2; i++) { |
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| 164 | ff_free_vlc(&ctx->dc_vlc[i]); |
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| 165 | ff_free_vlc(&ctx->ac_vlc[i]); |
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| 166 | } |
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| 167 | |||
| 168 | av_freep(&ctx->buf); |
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| 169 | } |
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| 170 | |||
| 171 | static void jpg_unescape(const uint8_t *src, int src_size, |
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| 172 | uint8_t *dst, int *dst_size) |
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| 173 | { |
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| 174 | const uint8_t *src_end = src + src_size; |
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| 175 | uint8_t *dst_start = dst; |
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| 176 | |||
| 177 | while (src < src_end) { |
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| 178 | uint8_t x = *src++; |
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| 179 | |||
| 180 | *dst++ = x; |
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| 181 | |||
| 182 | if (x == 0xFF && !*src) |
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| 183 | src++; |
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| 184 | } |
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| 185 | *dst_size = dst - dst_start; |
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| 186 | } |
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| 187 | |||
| 188 | static int jpg_decode_block(JPGContext *c, GetBitContext *gb, |
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| 189 | int plane, int16_t *block) |
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| 190 | { |
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| 191 | int dc, val, pos; |
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| 192 | const int is_chroma = !!plane; |
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| 193 | const uint8_t *qmat = is_chroma ? chroma_quant : luma_quant; |
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| 194 | |||
| 195 | c->dsp.clear_block(block); |
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| 196 | dc = get_vlc2(gb, c->dc_vlc[is_chroma].table, 9, 3); |
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| 197 | if (dc < 0) |
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| 198 | return AVERROR_INVALIDDATA; |
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| 199 | if (dc) |
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| 200 | dc = get_xbits(gb, dc); |
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| 201 | dc = dc * qmat[0] + c->prev_dc[plane]; |
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| 202 | block[0] = dc; |
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| 203 | c->prev_dc[plane] = dc; |
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| 204 | |||
| 205 | pos = 0; |
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| 206 | while (pos < 63) { |
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| 207 | val = get_vlc2(gb, c->ac_vlc[is_chroma].table, 9, 3); |
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| 208 | if (val < 0) |
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| 209 | return AVERROR_INVALIDDATA; |
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| 210 | pos += val >> 4; |
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| 211 | val &= 0xF; |
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| 212 | if (pos > 63) |
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| 213 | return val ? AVERROR_INVALIDDATA : 0; |
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| 214 | if (val) { |
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| 215 | int nbits = val; |
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| 216 | |||
| 217 | val = get_xbits(gb, nbits); |
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| 218 | val *= qmat[ff_zigzag_direct[pos]]; |
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| 219 | block[c->scantable.permutated[pos]] = val; |
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| 220 | } |
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| 221 | } |
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| 222 | return 0; |
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| 223 | } |
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| 224 | |||
| 225 | static inline void yuv2rgb(uint8_t *out, int Y, int U, int V) |
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| 226 | { |
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| 227 | out[0] = av_clip_uint8(Y + ( 91881 * V + 32768 >> 16)); |
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| 228 | out[1] = av_clip_uint8(Y + (-22554 * U - 46802 * V + 32768 >> 16)); |
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| 229 | out[2] = av_clip_uint8(Y + (116130 * U + 32768 >> 16)); |
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| 230 | } |
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| 231 | |||
| 232 | static int jpg_decode_data(JPGContext *c, int width, int height, |
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| 233 | const uint8_t *src, int src_size, |
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| 234 | uint8_t *dst, int dst_stride, |
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| 235 | const uint8_t *mask, int mask_stride, int num_mbs, |
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| 236 | int swapuv) |
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| 237 | { |
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| 238 | GetBitContext gb; |
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| 239 | uint8_t *tmp; |
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| 240 | int mb_w, mb_h, mb_x, mb_y, i, j; |
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| 241 | int bx, by; |
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| 242 | int unesc_size; |
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| 243 | int ret; |
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| 244 | |||
| 245 | tmp = av_realloc(c->buf, src_size + FF_INPUT_BUFFER_PADDING_SIZE); |
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| 246 | if (!tmp) |
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| 247 | return AVERROR(ENOMEM); |
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| 248 | c->buf = tmp; |
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| 249 | jpg_unescape(src, src_size, c->buf, &unesc_size); |
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| 250 | memset(c->buf + unesc_size, 0, FF_INPUT_BUFFER_PADDING_SIZE); |
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| 251 | init_get_bits(&gb, c->buf, unesc_size * 8); |
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| 252 | |||
| 253 | width = FFALIGN(width, 16); |
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| 254 | mb_w = width >> 4; |
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| 255 | mb_h = (height + 15) >> 4; |
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| 256 | |||
| 257 | if (!num_mbs) |
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| 258 | num_mbs = mb_w * mb_h; |
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| 259 | |||
| 260 | for (i = 0; i < 3; i++) |
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| 261 | c->prev_dc[i] = 1024; |
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| 262 | bx = by = 0; |
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| 263 | for (mb_y = 0; mb_y < mb_h; mb_y++) { |
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| 264 | for (mb_x = 0; mb_x < mb_w; mb_x++) { |
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| 265 | if (mask && !mask[mb_x]) { |
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| 266 | bx += 16; |
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| 267 | continue; |
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| 268 | } |
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| 269 | for (j = 0; j < 2; j++) { |
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| 270 | for (i = 0; i < 2; i++) { |
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| 271 | if ((ret = jpg_decode_block(c, &gb, 0, |
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| 272 | c->block[i + j * 2])) != 0) |
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| 273 | return ret; |
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| 274 | c->dsp.idct(c->block[i + j * 2]); |
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| 275 | } |
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| 276 | } |
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| 277 | for (i = 1; i < 3; i++) { |
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| 278 | if ((ret = jpg_decode_block(c, &gb, i, c->block[i + 3])) != 0) |
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| 279 | return ret; |
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| 280 | c->dsp.idct(c->block[i + 3]); |
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| 281 | } |
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| 282 | |||
| 283 | for (j = 0; j < 16; j++) { |
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| 284 | uint8_t *out = dst + bx * 3 + (by + j) * dst_stride; |
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| 285 | for (i = 0; i < 16; i++) { |
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| 286 | int Y, U, V; |
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| 287 | |||
| 288 | Y = c->block[(j >> 3) * 2 + (i >> 3)][(i & 7) + (j & 7) * 8]; |
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| 289 | U = c->block[4 ^ swapuv][(i >> 1) + (j >> 1) * 8] - 128; |
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| 290 | V = c->block[5 ^ swapuv][(i >> 1) + (j >> 1) * 8] - 128; |
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| 291 | yuv2rgb(out + i * 3, Y, U, V); |
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| 292 | } |
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| 293 | } |
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| 294 | |||
| 295 | if (!--num_mbs) |
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| 296 | return 0; |
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| 297 | bx += 16; |
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| 298 | } |
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| 299 | bx = 0; |
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| 300 | by += 16; |
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| 301 | if (mask) |
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| 302 | mask += mask_stride; |
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| 303 | } |
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| 304 | |||
| 305 | return 0; |
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| 306 | } |
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| 307 | |||
| 308 | static void kempf_restore_buf(const uint8_t *src, int len, |
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| 309 | uint8_t *dst, int stride, |
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| 310 | const uint8_t *jpeg_tile, int tile_stride, |
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| 311 | int width, int height, |
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| 312 | const uint8_t *pal, int npal, int tidx) |
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| 313 | { |
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| 314 | GetBitContext gb; |
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| 315 | int i, j, nb, col; |
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| 316 | |||
| 317 | init_get_bits(&gb, src, len * 8); |
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| 318 | |||
| 319 | if (npal <= 2) nb = 1; |
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| 320 | else if (npal <= 4) nb = 2; |
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| 321 | else if (npal <= 16) nb = 4; |
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| 322 | else nb = 8; |
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| 323 | |||
| 324 | for (j = 0; j < height; j++, dst += stride, jpeg_tile += tile_stride) { |
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| 325 | if (get_bits(&gb, 8)) |
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| 326 | continue; |
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| 327 | for (i = 0; i < width; i++) { |
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| 328 | col = get_bits(&gb, nb); |
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| 329 | if (col != tidx) |
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| 330 | memcpy(dst + i * 3, pal + col * 3, 3); |
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| 331 | else |
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| 332 | memcpy(dst + i * 3, jpeg_tile + i * 3, 3); |
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| 333 | } |
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| 334 | } |
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| 335 | } |
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| 336 | |||
| 337 | static int kempf_decode_tile(G2MContext *c, int tile_x, int tile_y, |
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| 338 | const uint8_t *src, int src_size) |
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| 339 | { |
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| 340 | int width, height; |
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| 341 | int hdr, zsize, npal, tidx = -1, ret; |
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| 342 | int i, j; |
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| 343 | const uint8_t *src_end = src + src_size; |
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| 344 | uint8_t pal[768], transp[3]; |
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| 345 | uLongf dlen = (c->tile_width + 1) * c->tile_height; |
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| 346 | int sub_type; |
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| 347 | int nblocks, cblocks, bstride; |
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| 348 | int bits, bitbuf, coded; |
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| 349 | uint8_t *dst = c->framebuf + tile_x * c->tile_width * 3 + |
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| 350 | tile_y * c->tile_height * c->framebuf_stride; |
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| 351 | |||
| 352 | if (src_size < 2) |
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| 353 | return AVERROR_INVALIDDATA; |
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| 354 | |||
| 355 | width = FFMIN(c->width - tile_x * c->tile_width, c->tile_width); |
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| 356 | height = FFMIN(c->height - tile_y * c->tile_height, c->tile_height); |
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| 357 | |||
| 358 | hdr = *src++; |
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| 359 | sub_type = hdr >> 5; |
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| 360 | if (sub_type == 0) { |
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| 361 | int j; |
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| 362 | memcpy(transp, src, 3); |
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| 363 | src += 3; |
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| 364 | for (j = 0; j < height; j++, dst += c->framebuf_stride) |
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| 365 | for (i = 0; i < width; i++) |
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| 366 | memcpy(dst + i * 3, transp, 3); |
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| 367 | return 0; |
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| 368 | } else if (sub_type == 1) { |
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| 369 | return jpg_decode_data(&c->jc, width, height, src, src_end - src, |
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| 370 | dst, c->framebuf_stride, NULL, 0, 0, 0); |
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| 371 | } |
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| 372 | |||
| 373 | if (sub_type != 2) { |
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| 374 | memcpy(transp, src, 3); |
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| 375 | src += 3; |
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| 376 | } |
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| 377 | npal = *src++ + 1; |
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| 378 | memcpy(pal, src, npal * 3); src += npal * 3; |
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| 379 | if (sub_type != 2) { |
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| 380 | for (i = 0; i < npal; i++) { |
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| 381 | if (!memcmp(pal + i * 3, transp, 3)) { |
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| 382 | tidx = i; |
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| 383 | break; |
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| 384 | } |
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| 385 | } |
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| 386 | } |
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| 387 | |||
| 388 | if (src_end - src < 2) |
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| 389 | return 0; |
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| 390 | zsize = (src[0] << 8) | src[1]; src += 2; |
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| 391 | |||
| 392 | if (src_end - src < zsize + (sub_type != 2)) |
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| 393 | return AVERROR_INVALIDDATA; |
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| 394 | |||
| 395 | ret = uncompress(c->kempf_buf, &dlen, src, zsize); |
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| 396 | if (ret) |
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| 397 | return AVERROR_INVALIDDATA; |
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| 398 | src += zsize; |
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| 399 | |||
| 400 | if (sub_type == 2) { |
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| 401 | kempf_restore_buf(c->kempf_buf, dlen, dst, c->framebuf_stride, |
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| 402 | NULL, 0, width, height, pal, npal, tidx); |
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| 403 | return 0; |
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| 404 | } |
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| 405 | |||
| 406 | nblocks = *src++ + 1; |
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| 407 | cblocks = 0; |
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| 408 | bstride = FFALIGN(width, 16) >> 4; |
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| 409 | // blocks are coded LSB and we need normal bitreader for JPEG data |
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| 410 | bits = 0; |
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| 411 | for (i = 0; i < (FFALIGN(height, 16) >> 4); i++) { |
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| 412 | for (j = 0; j < (FFALIGN(width, 16) >> 4); j++) { |
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| 413 | if (!bits) { |
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| 414 | if (src >= src_end) |
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| 415 | return AVERROR_INVALIDDATA; |
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| 416 | bitbuf = *src++; |
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| 417 | bits = 8; |
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| 418 | } |
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| 419 | coded = bitbuf & 1; |
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| 420 | bits--; |
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| 421 | bitbuf >>= 1; |
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| 422 | cblocks += coded; |
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| 423 | if (cblocks > nblocks) |
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| 424 | return AVERROR_INVALIDDATA; |
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| 425 | c->kempf_flags[j + i * bstride] = coded; |
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| 426 | } |
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| 427 | } |
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| 428 | |||
| 429 | memset(c->jpeg_tile, 0, c->tile_stride * height); |
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| 430 | jpg_decode_data(&c->jc, width, height, src, src_end - src, |
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| 431 | c->jpeg_tile, c->tile_stride, |
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| 432 | c->kempf_flags, bstride, nblocks, 0); |
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| 433 | |||
| 434 | kempf_restore_buf(c->kempf_buf, dlen, dst, c->framebuf_stride, |
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| 435 | c->jpeg_tile, c->tile_stride, |
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| 436 | width, height, pal, npal, tidx); |
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| 437 | |||
| 438 | return 0; |
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| 439 | } |
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| 440 | |||
| 441 | static int g2m_init_buffers(G2MContext *c) |
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| 442 | { |
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| 443 | int aligned_height; |
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| 444 | |||
| 445 | if (!c->framebuf || c->old_width < c->width || c->old_height < c->height) { |
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| 446 | c->framebuf_stride = FFALIGN(c->width + 15, 16) * 3; |
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| 447 | aligned_height = c->height + 15; |
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| 448 | av_free(c->framebuf); |
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| 449 | c->framebuf = av_mallocz(c->framebuf_stride * aligned_height); |
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| 450 | if (!c->framebuf) |
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| 451 | return AVERROR(ENOMEM); |
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| 452 | } |
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| 453 | if (!c->synth_tile || !c->jpeg_tile || |
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| 454 | c->old_tile_w < c->tile_width || |
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| 455 | c->old_tile_h < c->tile_height) { |
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| 456 | c->tile_stride = FFALIGN(c->tile_width, 16) * 3; |
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| 457 | aligned_height = FFALIGN(c->tile_height, 16); |
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| 458 | av_free(c->synth_tile); |
||
| 459 | av_free(c->jpeg_tile); |
||
| 460 | av_free(c->kempf_buf); |
||
| 461 | av_free(c->kempf_flags); |
||
| 462 | c->synth_tile = av_mallocz(c->tile_stride * aligned_height); |
||
| 463 | c->jpeg_tile = av_mallocz(c->tile_stride * aligned_height); |
||
| 464 | c->kempf_buf = av_mallocz((c->tile_width + 1) * aligned_height |
||
| 465 | + FF_INPUT_BUFFER_PADDING_SIZE); |
||
| 466 | c->kempf_flags = av_mallocz( c->tile_width * aligned_height); |
||
| 467 | if (!c->synth_tile || !c->jpeg_tile || |
||
| 468 | !c->kempf_buf || !c->kempf_flags) |
||
| 469 | return AVERROR(ENOMEM); |
||
| 470 | } |
||
| 471 | |||
| 472 | return 0; |
||
| 473 | } |
||
| 474 | |||
| 475 | static int g2m_load_cursor(AVCodecContext *avctx, G2MContext *c, |
||
| 476 | GetByteContext *gb) |
||
| 477 | { |
||
| 478 | int i, j, k; |
||
| 479 | uint8_t *dst; |
||
| 480 | uint32_t bits; |
||
| 481 | uint32_t cur_size, cursor_w, cursor_h, cursor_stride; |
||
| 482 | uint32_t cursor_hot_x, cursor_hot_y; |
||
| 483 | int cursor_fmt; |
||
| 484 | uint8_t *tmp; |
||
| 485 | |||
| 486 | cur_size = bytestream2_get_be32(gb); |
||
| 487 | cursor_w = bytestream2_get_byte(gb); |
||
| 488 | cursor_h = bytestream2_get_byte(gb); |
||
| 489 | cursor_hot_x = bytestream2_get_byte(gb); |
||
| 490 | cursor_hot_y = bytestream2_get_byte(gb); |
||
| 491 | cursor_fmt = bytestream2_get_byte(gb); |
||
| 492 | |||
| 493 | cursor_stride = FFALIGN(cursor_w, c->cursor_fmt==1 ? 32 : 1) * 4; |
||
| 494 | |||
| 495 | if (cursor_w < 1 || cursor_w > 256 || |
||
| 496 | cursor_h < 1 || cursor_h > 256) { |
||
| 497 | av_log(avctx, AV_LOG_ERROR, "Invalid cursor dimensions %dx%d\n", |
||
| 498 | cursor_w, cursor_h); |
||
| 499 | return AVERROR_INVALIDDATA; |
||
| 500 | } |
||
| 501 | if (cursor_hot_x > cursor_w || cursor_hot_y > cursor_h) { |
||
| 502 | av_log(avctx, AV_LOG_WARNING, "Invalid hotspot position %d,%d\n", |
||
| 503 | cursor_hot_x, cursor_hot_y); |
||
| 504 | cursor_hot_x = FFMIN(cursor_hot_x, cursor_w - 1); |
||
| 505 | cursor_hot_y = FFMIN(cursor_hot_y, cursor_h - 1); |
||
| 506 | } |
||
| 507 | if (cur_size - 9 > bytestream2_get_bytes_left(gb) || |
||
| 508 | c->cursor_w * c->cursor_h / 4 > cur_size) { |
||
| 509 | av_log(avctx, AV_LOG_ERROR, "Invalid cursor data size %d/%d\n", |
||
| 510 | cur_size, bytestream2_get_bytes_left(gb)); |
||
| 511 | return AVERROR_INVALIDDATA; |
||
| 512 | } |
||
| 513 | if (cursor_fmt != 1 && cursor_fmt != 32) { |
||
| 514 | avpriv_report_missing_feature(avctx, "Cursor format %d", |
||
| 515 | cursor_fmt); |
||
| 516 | return AVERROR_PATCHWELCOME; |
||
| 517 | } |
||
| 518 | |||
| 519 | tmp = av_realloc(c->cursor, cursor_stride * cursor_h); |
||
| 520 | if (!tmp) { |
||
| 521 | av_log(avctx, AV_LOG_ERROR, "Cannot allocate cursor buffer\n"); |
||
| 522 | return AVERROR(ENOMEM); |
||
| 523 | } |
||
| 524 | |||
| 525 | c->cursor = tmp; |
||
| 526 | c->cursor_w = cursor_w; |
||
| 527 | c->cursor_h = cursor_h; |
||
| 528 | c->cursor_hot_x = cursor_hot_x; |
||
| 529 | c->cursor_hot_y = cursor_hot_y; |
||
| 530 | c->cursor_fmt = cursor_fmt; |
||
| 531 | c->cursor_stride = cursor_stride; |
||
| 532 | |||
| 533 | dst = c->cursor; |
||
| 534 | switch (c->cursor_fmt) { |
||
| 535 | case 1: // old monochrome |
||
| 536 | for (j = 0; j < c->cursor_h; j++) { |
||
| 537 | for (i = 0; i < c->cursor_w; i += 32) { |
||
| 538 | bits = bytestream2_get_be32(gb); |
||
| 539 | for (k = 0; k < 32; k++) { |
||
| 540 | dst[0] = !!(bits & 0x80000000); |
||
| 541 | dst += 4; |
||
| 542 | bits <<= 1; |
||
| 543 | } |
||
| 544 | } |
||
| 545 | } |
||
| 546 | |||
| 547 | dst = c->cursor; |
||
| 548 | for (j = 0; j < c->cursor_h; j++) { |
||
| 549 | for (i = 0; i < c->cursor_w; i += 32) { |
||
| 550 | bits = bytestream2_get_be32(gb); |
||
| 551 | for (k = 0; k < 32; k++) { |
||
| 552 | int mask_bit = !!(bits & 0x80000000); |
||
| 553 | switch (dst[0] * 2 + mask_bit) { |
||
| 554 | case 0: |
||
| 555 | dst[0] = 0xFF; dst[1] = 0x00; |
||
| 556 | dst[2] = 0x00; dst[3] = 0x00; |
||
| 557 | break; |
||
| 558 | case 1: |
||
| 559 | dst[0] = 0xFF; dst[1] = 0xFF; |
||
| 560 | dst[2] = 0xFF; dst[3] = 0xFF; |
||
| 561 | break; |
||
| 562 | default: |
||
| 563 | dst[0] = 0x00; dst[1] = 0x00; |
||
| 564 | dst[2] = 0x00; dst[3] = 0x00; |
||
| 565 | } |
||
| 566 | dst += 4; |
||
| 567 | bits <<= 1; |
||
| 568 | } |
||
| 569 | } |
||
| 570 | } |
||
| 571 | break; |
||
| 572 | case 32: // full colour |
||
| 573 | /* skip monochrome version of the cursor and decode RGBA instead */ |
||
| 574 | bytestream2_skip(gb, c->cursor_h * (FFALIGN(c->cursor_w, 32) >> 3)); |
||
| 575 | for (j = 0; j < c->cursor_h; j++) { |
||
| 576 | for (i = 0; i < c->cursor_w; i++) { |
||
| 577 | int val = bytestream2_get_be32(gb); |
||
| 578 | *dst++ = val >> 0; |
||
| 579 | *dst++ = val >> 8; |
||
| 580 | *dst++ = val >> 16; |
||
| 581 | *dst++ = val >> 24; |
||
| 582 | } |
||
| 583 | } |
||
| 584 | break; |
||
| 585 | default: |
||
| 586 | return AVERROR_PATCHWELCOME; |
||
| 587 | } |
||
| 588 | return 0; |
||
| 589 | } |
||
| 590 | |||
| 591 | #define APPLY_ALPHA(src, new, alpha) \ |
||
| 592 | src = (src * (256 - alpha) + new * alpha) >> 8 |
||
| 593 | |||
| 594 | static void g2m_paint_cursor(G2MContext *c, uint8_t *dst, int stride) |
||
| 595 | { |
||
| 596 | int i, j; |
||
| 597 | int x, y, w, h; |
||
| 598 | const uint8_t *cursor; |
||
| 599 | |||
| 600 | if (!c->cursor) |
||
| 601 | return; |
||
| 602 | |||
| 603 | x = c->cursor_x - c->cursor_hot_x; |
||
| 604 | y = c->cursor_y - c->cursor_hot_y; |
||
| 605 | |||
| 606 | cursor = c->cursor; |
||
| 607 | w = c->cursor_w; |
||
| 608 | h = c->cursor_h; |
||
| 609 | |||
| 610 | if (x + w > c->width) |
||
| 611 | w = c->width - x; |
||
| 612 | if (y + h > c->height) |
||
| 613 | h = c->height - y; |
||
| 614 | if (x < 0) { |
||
| 615 | w += x; |
||
| 616 | cursor += -x * 4; |
||
| 617 | } else { |
||
| 618 | dst += x * 3; |
||
| 619 | } |
||
| 620 | if (y < 0) { |
||
| 621 | h += y; |
||
| 622 | cursor += -y * c->cursor_stride; |
||
| 623 | } else { |
||
| 624 | dst += y * stride; |
||
| 625 | } |
||
| 626 | if (w < 0 || h < 0) |
||
| 627 | return; |
||
| 628 | |||
| 629 | for (j = 0; j < h; j++) { |
||
| 630 | for (i = 0; i < w; i++) { |
||
| 631 | uint8_t alpha = cursor[i * 4]; |
||
| 632 | APPLY_ALPHA(dst[i * 3 + 0], cursor[i * 4 + 1], alpha); |
||
| 633 | APPLY_ALPHA(dst[i * 3 + 1], cursor[i * 4 + 2], alpha); |
||
| 634 | APPLY_ALPHA(dst[i * 3 + 2], cursor[i * 4 + 3], alpha); |
||
| 635 | } |
||
| 636 | dst += stride; |
||
| 637 | cursor += c->cursor_stride; |
||
| 638 | } |
||
| 639 | } |
||
| 640 | |||
| 641 | static int g2m_decode_frame(AVCodecContext *avctx, void *data, |
||
| 642 | int *got_picture_ptr, AVPacket *avpkt) |
||
| 643 | { |
||
| 644 | const uint8_t *buf = avpkt->data; |
||
| 645 | int buf_size = avpkt->size; |
||
| 646 | G2MContext *c = avctx->priv_data; |
||
| 647 | AVFrame *pic = data; |
||
| 648 | GetByteContext bc, tbc; |
||
| 649 | int magic; |
||
| 650 | int got_header = 0; |
||
| 651 | uint32_t chunk_size; |
||
| 652 | int chunk_type; |
||
| 653 | int i; |
||
| 654 | int ret; |
||
| 655 | |||
| 656 | if (buf_size < 12) { |
||
| 657 | av_log(avctx, AV_LOG_ERROR, |
||
| 658 | "Frame should have at least 12 bytes, got %d instead\n", |
||
| 659 | buf_size); |
||
| 660 | return AVERROR_INVALIDDATA; |
||
| 661 | } |
||
| 662 | |||
| 663 | bytestream2_init(&bc, buf, buf_size); |
||
| 664 | |||
| 665 | magic = bytestream2_get_be32(&bc); |
||
| 666 | if ((magic & ~0xF) != MKBETAG('G', '2', 'M', '0') || |
||
| 667 | (magic & 0xF) < 2 || (magic & 0xF) > 4) { |
||
| 668 | av_log(avctx, AV_LOG_ERROR, "Wrong magic %08X\n", magic); |
||
| 669 | return AVERROR_INVALIDDATA; |
||
| 670 | } |
||
| 671 | |||
| 672 | if ((magic & 0xF) != 4) { |
||
| 673 | av_log(avctx, AV_LOG_ERROR, "G2M2 and G2M3 are not yet supported\n"); |
||
| 674 | return AVERROR(ENOSYS); |
||
| 675 | } |
||
| 676 | |||
| 677 | while (bytestream2_get_bytes_left(&bc) > 5) { |
||
| 678 | chunk_size = bytestream2_get_le32(&bc) - 1; |
||
| 679 | chunk_type = bytestream2_get_byte(&bc); |
||
| 680 | if (chunk_size > bytestream2_get_bytes_left(&bc)) { |
||
| 681 | av_log(avctx, AV_LOG_ERROR, "Invalid chunk size %d type %02X\n", |
||
| 682 | chunk_size, chunk_type); |
||
| 683 | break; |
||
| 684 | } |
||
| 685 | switch (chunk_type) { |
||
| 686 | case FRAME_INFO: |
||
| 687 | c->got_header = 0; |
||
| 688 | if (chunk_size < 21) { |
||
| 689 | av_log(avctx, AV_LOG_ERROR, "Invalid frame info size %d\n", |
||
| 690 | chunk_size); |
||
| 691 | break; |
||
| 692 | } |
||
| 693 | c->width = bytestream2_get_be32(&bc); |
||
| 694 | c->height = bytestream2_get_be32(&bc); |
||
| 695 | if (c->width < 16 || c->width > avctx->width || |
||
| 696 | c->height < 16 || c->height > avctx->height) { |
||
| 697 | av_log(avctx, AV_LOG_ERROR, |
||
| 698 | "Invalid frame dimensions %dx%d\n", |
||
| 699 | c->width, c->height); |
||
| 700 | ret = AVERROR_INVALIDDATA; |
||
| 701 | goto header_fail; |
||
| 702 | } |
||
| 703 | if (c->width != avctx->width || c->height != avctx->height) |
||
| 704 | avcodec_set_dimensions(avctx, c->width, c->height); |
||
| 705 | c->compression = bytestream2_get_be32(&bc); |
||
| 706 | if (c->compression != 2 && c->compression != 3) { |
||
| 707 | av_log(avctx, AV_LOG_ERROR, |
||
| 708 | "Unknown compression method %d\n", |
||
| 709 | c->compression); |
||
| 710 | return AVERROR_PATCHWELCOME; |
||
| 711 | } |
||
| 712 | c->tile_width = bytestream2_get_be32(&bc); |
||
| 713 | c->tile_height = bytestream2_get_be32(&bc); |
||
| 714 | if (!c->tile_width || !c->tile_height) { |
||
| 715 | av_log(avctx, AV_LOG_ERROR, |
||
| 716 | "Invalid tile dimensions %dx%d\n", |
||
| 717 | c->tile_width, c->tile_height); |
||
| 718 | ret = AVERROR_INVALIDDATA; |
||
| 719 | goto header_fail; |
||
| 720 | } |
||
| 721 | c->tiles_x = (c->width + c->tile_width - 1) / c->tile_width; |
||
| 722 | c->tiles_y = (c->height + c->tile_height - 1) / c->tile_height; |
||
| 723 | c->bpp = bytestream2_get_byte(&bc); |
||
| 724 | chunk_size -= 21; |
||
| 725 | bytestream2_skip(&bc, chunk_size); |
||
| 726 | if (g2m_init_buffers(c)) { |
||
| 727 | ret = AVERROR(ENOMEM); |
||
| 728 | goto header_fail; |
||
| 729 | } |
||
| 730 | got_header = 1; |
||
| 731 | break; |
||
| 732 | case TILE_DATA: |
||
| 733 | if (!c->tiles_x || !c->tiles_y) { |
||
| 734 | av_log(avctx, AV_LOG_WARNING, |
||
| 735 | "No frame header - skipping tile\n"); |
||
| 736 | bytestream2_skip(&bc, bytestream2_get_bytes_left(&bc)); |
||
| 737 | break; |
||
| 738 | } |
||
| 739 | if (chunk_size < 2) { |
||
| 740 | av_log(avctx, AV_LOG_ERROR, "Invalid tile data size %d\n", |
||
| 741 | chunk_size); |
||
| 742 | break; |
||
| 743 | } |
||
| 744 | c->tile_x = bytestream2_get_byte(&bc); |
||
| 745 | c->tile_y = bytestream2_get_byte(&bc); |
||
| 746 | if (c->tile_x >= c->tiles_x || c->tile_y >= c->tiles_y) { |
||
| 747 | av_log(avctx, AV_LOG_ERROR, |
||
| 748 | "Invalid tile pos %d,%d (in %dx%d grid)\n", |
||
| 749 | c->tile_x, c->tile_y, c->tiles_x, c->tiles_y); |
||
| 750 | break; |
||
| 751 | } |
||
| 752 | chunk_size -= 2; |
||
| 753 | ret = 0; |
||
| 754 | switch (c->compression) { |
||
| 755 | case COMPR_EPIC_J_B: |
||
| 756 | av_log(avctx, AV_LOG_ERROR, |
||
| 757 | "ePIC j-b compression is not implemented yet\n"); |
||
| 758 | return AVERROR(ENOSYS); |
||
| 759 | case COMPR_KEMPF_J_B: |
||
| 760 | ret = kempf_decode_tile(c, c->tile_x, c->tile_y, |
||
| 761 | buf + bytestream2_tell(&bc), |
||
| 762 | chunk_size); |
||
| 763 | break; |
||
| 764 | } |
||
| 765 | if (ret && c->framebuf) |
||
| 766 | av_log(avctx, AV_LOG_ERROR, "Error decoding tile %d,%d\n", |
||
| 767 | c->tile_x, c->tile_y); |
||
| 768 | bytestream2_skip(&bc, chunk_size); |
||
| 769 | break; |
||
| 770 | case CURSOR_POS: |
||
| 771 | if (chunk_size < 5) { |
||
| 772 | av_log(avctx, AV_LOG_ERROR, "Invalid cursor pos size %d\n", |
||
| 773 | chunk_size); |
||
| 774 | break; |
||
| 775 | } |
||
| 776 | c->cursor_x = bytestream2_get_be16(&bc); |
||
| 777 | c->cursor_y = bytestream2_get_be16(&bc); |
||
| 778 | bytestream2_skip(&bc, chunk_size - 4); |
||
| 779 | break; |
||
| 780 | case CURSOR_SHAPE: |
||
| 781 | if (chunk_size < 8) { |
||
| 782 | av_log(avctx, AV_LOG_ERROR, "Invalid cursor data size %d\n", |
||
| 783 | chunk_size); |
||
| 784 | break; |
||
| 785 | } |
||
| 786 | bytestream2_init(&tbc, buf + bytestream2_tell(&bc), |
||
| 787 | chunk_size - 4); |
||
| 788 | g2m_load_cursor(avctx, c, &tbc); |
||
| 789 | bytestream2_skip(&bc, chunk_size); |
||
| 790 | break; |
||
| 791 | case CHUNK_CC: |
||
| 792 | case CHUNK_CD: |
||
| 793 | bytestream2_skip(&bc, chunk_size); |
||
| 794 | break; |
||
| 795 | default: |
||
| 796 | av_log(avctx, AV_LOG_WARNING, "Skipping chunk type %02X\n", |
||
| 797 | chunk_type); |
||
| 798 | bytestream2_skip(&bc, chunk_size); |
||
| 799 | } |
||
| 800 | } |
||
| 801 | if (got_header) |
||
| 802 | c->got_header = 1; |
||
| 803 | |||
| 804 | if (c->width && c->height && c->framebuf) { |
||
| 805 | if ((ret = ff_get_buffer(avctx, pic, 0)) < 0) |
||
| 806 | return ret; |
||
| 807 | |||
| 808 | pic->key_frame = got_header; |
||
| 809 | pic->pict_type = got_header ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P; |
||
| 810 | |||
| 811 | for (i = 0; i < avctx->height; i++) |
||
| 812 | memcpy(pic->data[0] + i * pic->linesize[0], |
||
| 813 | c->framebuf + i * c->framebuf_stride, |
||
| 814 | c->width * 3); |
||
| 815 | g2m_paint_cursor(c, pic->data[0], pic->linesize[0]); |
||
| 816 | |||
| 817 | *got_picture_ptr = 1; |
||
| 818 | } |
||
| 819 | |||
| 820 | return buf_size; |
||
| 821 | header_fail: |
||
| 822 | c->width = c->height = 0; |
||
| 823 | c->tiles_x = c->tiles_y = 0; |
||
| 824 | return ret; |
||
| 825 | } |
||
| 826 | |||
| 827 | static av_cold int g2m_decode_init(AVCodecContext *avctx) |
||
| 828 | { |
||
| 829 | G2MContext * const c = avctx->priv_data; |
||
| 830 | int ret; |
||
| 831 | |||
| 832 | if ((ret = jpg_init(avctx, &c->jc)) != 0) { |
||
| 833 | av_log(avctx, AV_LOG_ERROR, "Cannot initialise VLCs\n"); |
||
| 834 | jpg_free_context(&c->jc); |
||
| 835 | return AVERROR(ENOMEM); |
||
| 836 | } |
||
| 837 | |||
| 838 | avctx->pix_fmt = AV_PIX_FMT_RGB24; |
||
| 839 | |||
| 840 | return 0; |
||
| 841 | } |
||
| 842 | |||
| 843 | static av_cold int g2m_decode_end(AVCodecContext *avctx) |
||
| 844 | { |
||
| 845 | G2MContext * const c = avctx->priv_data; |
||
| 846 | |||
| 847 | jpg_free_context(&c->jc); |
||
| 848 | |||
| 849 | av_freep(&c->kempf_buf); |
||
| 850 | av_freep(&c->kempf_flags); |
||
| 851 | av_freep(&c->synth_tile); |
||
| 852 | av_freep(&c->jpeg_tile); |
||
| 853 | av_freep(&c->cursor); |
||
| 854 | av_freep(&c->framebuf); |
||
| 855 | |||
| 856 | return 0; |
||
| 857 | } |
||
| 858 | |||
| 859 | AVCodec ff_g2m_decoder = { |
||
| 860 | .name = "g2m", |
||
| 861 | .long_name = NULL_IF_CONFIG_SMALL("Go2Meeting"), |
||
| 862 | .type = AVMEDIA_TYPE_VIDEO, |
||
| 863 | .id = AV_CODEC_ID_G2M, |
||
| 864 | .priv_data_size = sizeof(G2MContext), |
||
| 865 | .init = g2m_decode_init, |
||
| 866 | .close = g2m_decode_end, |
||
| 867 | .decode = g2m_decode_frame, |
||
| 868 | .capabilities = CODEC_CAP_DR1, |
||
| 869 | }; |