blob: 42d382de1fecb4d94460968dbfe51b2df547bd2d
| 1 | /* |
| 2 | * Canopus HQX decoder |
| 3 | * |
| 4 | * This file is part of FFmpeg. |
| 5 | * |
| 6 | * FFmpeg is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU Lesser General Public |
| 8 | * License as published by the Free Software Foundation; either |
| 9 | * version 2.1 of the License, or (at your option) any later version. |
| 10 | * |
| 11 | * FFmpeg is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 14 | * Lesser General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU Lesser General Public |
| 17 | * License along with FFmpeg; if not, write to the Free Software |
| 18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 19 | */ |
| 20 | |
| 21 | #ifndef AVCODEC_HQX_H |
| 22 | #define AVCODEC_HQX_H |
| 23 | |
| 24 | #include <stdint.h> |
| 25 | |
| 26 | #include "libavutil/frame.h" |
| 27 | #include "libavutil/mem.h" |
| 28 | #include "get_bits.h" |
| 29 | #include "hqxdsp.h" |
| 30 | |
| 31 | enum HQXACMode { |
| 32 | HQX_AC_Q0 = 0, |
| 33 | HQX_AC_Q8, |
| 34 | HQX_AC_Q16, |
| 35 | HQX_AC_Q32, |
| 36 | HQX_AC_Q64, |
| 37 | HQX_AC_Q128, |
| 38 | NUM_HQX_AC |
| 39 | }; |
| 40 | |
| 41 | typedef struct HQXLUT { |
| 42 | int16_t lev; |
| 43 | uint8_t run; |
| 44 | int8_t bits; |
| 45 | } HQXLUT; |
| 46 | |
| 47 | typedef struct HQXAC { |
| 48 | int lut_bits, extra_bits; |
| 49 | const HQXLUT *lut; |
| 50 | } HQXAC; |
| 51 | |
| 52 | struct HQXContext; |
| 53 | |
| 54 | typedef int (*mb_decode_func)(struct HQXContext *ctx, |
| 55 | int slice_no, int x, int y); |
| 56 | |
| 57 | typedef struct HQXSlice { |
| 58 | GetBitContext gb; |
| 59 | DECLARE_ALIGNED(16, int16_t, block)[16][64]; |
| 60 | } HQXSlice; |
| 61 | |
| 62 | typedef struct HQXContext { |
| 63 | HQXDSPContext hqxdsp; |
| 64 | HQXSlice slice[16]; |
| 65 | |
| 66 | AVFrame *pic; |
| 67 | mb_decode_func decode_func; |
| 68 | |
| 69 | int format, dcb, width, height; |
| 70 | int interlaced; |
| 71 | |
| 72 | uint8_t *src; |
| 73 | unsigned int data_size; |
| 74 | uint32_t slice_off[17]; |
| 75 | |
| 76 | VLC cbp_vlc; |
| 77 | VLC dc_vlc[3]; |
| 78 | } HQXContext; |
| 79 | |
| 80 | #define HQX_DC_VLC_BITS 9 |
| 81 | |
| 82 | extern const HQXAC ff_hqx_ac[NUM_HQX_AC]; |
| 83 | |
| 84 | int ff_hqx_init_vlcs(HQXContext *ctx); |
| 85 | |
| 86 | #endif /* AVCODEC_HQX_H */ |
| 87 |