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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4349 | Serge | 1 | /* |
| 2 | * Bitmap Brothers JV video decoder |
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| 3 | * Copyright (c) 2011 Peter Ross |
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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 | * Bitmap Brothers JV video decoder |
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| 25 | * @author Peter Ross |
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| 26 | */ |
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| 27 | |||
| 28 | #include "avcodec.h" |
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| 29 | #include "dsputil.h" |
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| 30 | #include "get_bits.h" |
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| 31 | #include "internal.h" |
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| 32 | #include "libavutil/intreadwrite.h" |
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| 33 | |||
| 34 | typedef struct JvContext { |
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| 35 | DSPContext dsp; |
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| 36 | AVFrame *frame; |
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| 37 | uint32_t palette[AVPALETTE_COUNT]; |
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| 38 | int palette_has_changed; |
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| 39 | } JvContext; |
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| 40 | |||
| 41 | static av_cold int decode_init(AVCodecContext *avctx) |
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| 42 | { |
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| 43 | JvContext *s = avctx->priv_data; |
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| 44 | avctx->pix_fmt = AV_PIX_FMT_PAL8; |
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| 45 | ff_dsputil_init(&s->dsp, avctx); |
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| 46 | s->frame = av_frame_alloc(); |
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| 47 | if (!s->frame) |
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| 48 | return AVERROR(ENOMEM); |
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| 49 | return 0; |
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| 50 | } |
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| 51 | |||
| 52 | /** |
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| 53 | * Decode 2x2 block |
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| 54 | */ |
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| 55 | static inline void decode2x2(GetBitContext *gb, uint8_t *dst, int linesize) |
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| 56 | { |
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| 57 | int i, j, v[2]; |
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| 58 | |||
| 59 | switch (get_bits(gb, 2)) { |
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| 60 | case 1: |
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| 61 | v[0] = get_bits(gb, 8); |
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| 62 | for (j = 0; j < 2; j++) |
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| 63 | memset(dst + j*linesize, v[0], 2); |
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| 64 | break; |
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| 65 | case 2: |
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| 66 | v[0] = get_bits(gb, 8); |
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| 67 | v[1] = get_bits(gb, 8); |
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| 68 | for (j = 0; j < 2; j++) |
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| 69 | for (i = 0; i < 2; i++) |
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| 70 | dst[j*linesize + i] = v[get_bits1(gb)]; |
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| 71 | break; |
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| 72 | case 3: |
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| 73 | for (j = 0; j < 2; j++) |
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| 74 | for (i = 0; i < 2; i++) |
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| 75 | dst[j*linesize + i] = get_bits(gb, 8); |
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| 76 | } |
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| 77 | } |
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| 78 | |||
| 79 | /** |
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| 80 | * Decode 4x4 block |
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| 81 | */ |
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| 82 | static inline void decode4x4(GetBitContext *gb, uint8_t *dst, int linesize) |
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| 83 | { |
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| 84 | int i, j, v[2]; |
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| 85 | |||
| 86 | switch (get_bits(gb, 2)) { |
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| 87 | case 1: |
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| 88 | v[0] = get_bits(gb, 8); |
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| 89 | for (j = 0; j < 4; j++) |
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| 90 | memset(dst + j*linesize, v[0], 4); |
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| 91 | break; |
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| 92 | case 2: |
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| 93 | v[0] = get_bits(gb, 8); |
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| 94 | v[1] = get_bits(gb, 8); |
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| 95 | for (j = 2; j >= 0; j -= 2) { |
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| 96 | for (i = 0; i < 4; i++) |
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| 97 | dst[j*linesize + i] = v[get_bits1(gb)]; |
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| 98 | for (i = 0; i < 4; i++) |
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| 99 | dst[(j+1)*linesize + i] = v[get_bits1(gb)]; |
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| 100 | } |
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| 101 | break; |
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| 102 | case 3: |
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| 103 | for (j = 0; j < 4; j += 2) |
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| 104 | for (i = 0; i < 4; i += 2) |
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| 105 | decode2x2(gb, dst + j*linesize + i, linesize); |
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| 106 | } |
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| 107 | } |
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| 108 | |||
| 109 | /** |
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| 110 | * Decode 8x8 block |
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| 111 | */ |
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| 112 | static inline void decode8x8(GetBitContext *gb, uint8_t *dst, int linesize, DSPContext *dsp) |
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| 113 | { |
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| 114 | int i, j, v[2]; |
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| 115 | |||
| 116 | switch (get_bits(gb, 2)) { |
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| 117 | case 1: |
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| 118 | v[0] = get_bits(gb, 8); |
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| 119 | dsp->fill_block_tab[1](dst, v[0], linesize, 8); |
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| 120 | break; |
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| 121 | case 2: |
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| 122 | v[0] = get_bits(gb, 8); |
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| 123 | v[1] = get_bits(gb, 8); |
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| 124 | for (j = 7; j >= 0; j--) |
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| 125 | for (i = 0; i < 8; i++) |
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| 126 | dst[j*linesize + i] = v[get_bits1(gb)]; |
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| 127 | break; |
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| 128 | case 3: |
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| 129 | for (j = 0; j < 8; j += 4) |
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| 130 | for (i = 0; i < 8; i += 4) |
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| 131 | decode4x4(gb, dst + j*linesize + i, linesize); |
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| 132 | } |
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| 133 | } |
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| 134 | |||
| 135 | static int decode_frame(AVCodecContext *avctx, |
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| 136 | void *data, int *got_frame, |
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| 137 | AVPacket *avpkt) |
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| 138 | { |
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| 139 | JvContext *s = avctx->priv_data; |
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| 140 | const uint8_t *buf = avpkt->data; |
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| 141 | const uint8_t *buf_end = buf + avpkt->size; |
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| 142 | int video_size, video_type, i, j, ret; |
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| 143 | |||
| 144 | if (avpkt->size < 6) |
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| 145 | return AVERROR_INVALIDDATA; |
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| 146 | |||
| 147 | video_size = AV_RL32(buf); |
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| 148 | video_type = buf[4]; |
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| 149 | buf += 5; |
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| 150 | |||
| 151 | if (video_size) { |
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| 152 | if (video_size < 0 || video_size > avpkt->size - 5) { |
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| 153 | av_log(avctx, AV_LOG_ERROR, "video size %d invalid\n", video_size); |
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| 154 | return AVERROR_INVALIDDATA; |
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| 155 | } |
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| 156 | if ((ret = ff_reget_buffer(avctx, s->frame)) < 0) |
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| 157 | return ret; |
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| 158 | |||
| 159 | if (video_type == 0 || video_type == 1) { |
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| 160 | GetBitContext gb; |
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| 161 | init_get_bits(&gb, buf, 8 * video_size); |
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| 162 | |||
| 163 | for (j = 0; j < avctx->height; j += 8) |
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| 164 | for (i = 0; i < avctx->width; i += 8) |
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| 165 | decode8x8(&gb, s->frame->data[0] + j * s->frame->linesize[0] + i, |
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| 166 | s->frame->linesize[0], &s->dsp); |
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| 167 | |||
| 168 | buf += video_size; |
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| 169 | } else if (video_type == 2) { |
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| 170 | int v = *buf++; |
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| 171 | for (j = 0; j < avctx->height; j++) |
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| 172 | memset(s->frame->data[0] + j * s->frame->linesize[0], v, avctx->width); |
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| 173 | } else { |
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| 174 | av_log(avctx, AV_LOG_WARNING, "unsupported frame type %i\n", video_type); |
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| 175 | return AVERROR_INVALIDDATA; |
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| 176 | } |
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| 177 | } |
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| 178 | |||
| 179 | if (buf_end - buf >= AVPALETTE_COUNT * 3) { |
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| 180 | for (i = 0; i < AVPALETTE_COUNT; i++) { |
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| 181 | uint32_t pal = AV_RB24(buf); |
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| 182 | s->palette[i] = 0xFFU << 24 | pal << 2 | ((pal >> 4) & 0x30303); |
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| 183 | buf += 3; |
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| 184 | } |
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| 185 | s->palette_has_changed = 1; |
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| 186 | } |
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| 187 | |||
| 188 | if (video_size) { |
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| 189 | s->frame->key_frame = 1; |
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| 190 | s->frame->pict_type = AV_PICTURE_TYPE_I; |
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| 191 | s->frame->palette_has_changed = s->palette_has_changed; |
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| 192 | s->palette_has_changed = 0; |
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| 193 | memcpy(s->frame->data[1], s->palette, AVPALETTE_SIZE); |
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| 194 | |||
| 195 | if ((ret = av_frame_ref(data, s->frame)) < 0) |
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| 196 | return ret; |
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| 197 | *got_frame = 1; |
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| 198 | } |
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| 199 | |||
| 200 | return avpkt->size; |
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| 201 | } |
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| 202 | |||
| 203 | static av_cold int decode_close(AVCodecContext *avctx) |
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| 204 | { |
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| 205 | JvContext *s = avctx->priv_data; |
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| 206 | |||
| 207 | av_frame_free(&s->frame); |
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| 208 | |||
| 209 | return 0; |
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| 210 | } |
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| 211 | |||
| 212 | AVCodec ff_jv_decoder = { |
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| 213 | .name = "jv", |
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| 214 | .long_name = NULL_IF_CONFIG_SMALL("Bitmap Brothers JV video"), |
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| 215 | .type = AVMEDIA_TYPE_VIDEO, |
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| 216 | .id = AV_CODEC_ID_JV, |
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| 217 | .priv_data_size = sizeof(JvContext), |
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| 218 | .init = decode_init, |
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| 219 | .close = decode_close, |
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| 220 | .decode = decode_frame, |
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| 221 | .capabilities = CODEC_CAP_DR1, |
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| 222 | }; |