| 1 | /*
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| 2 | * AVS video decoder.
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| 3 | * Copyright (c) 2006 Aurelien Jacobs <[email protected]>
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| 4 | *
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| 5 | * This library is free software; you can redistribute it and/or
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| 6 | * modify it under the terms of the GNU Lesser General Public
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| 7 | * License as published by the Free Software Foundation; either
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| 8 | * version 2 of the License, or (at your option) any later version.
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| 9 | *
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| 10 | * This library is distributed in the hope that it will be useful,
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| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 13 | * Lesser General Public License for more details.
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| 14 | *
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| 15 | * You should have received a copy of the GNU Lesser General Public
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| 16 | * License along with this library; if not, write to the Free Software
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| 17 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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| 18 | */
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| 19 |
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| 20 | #include "avcodec.h"
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| 21 | #include "bitstream.h"
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| 22 |
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| 23 |
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| 24 | typedef struct {
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| 25 | AVFrame picture;
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| 26 | } avs_context_t;
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| 27 |
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| 28 | typedef enum {
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| 29 | AVS_VIDEO = 0x01,
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| 30 | AVS_AUDIO = 0x02,
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| 31 | AVS_PALETTE = 0x03,
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| 32 | AVS_GAME_DATA = 0x04,
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| 33 | } avs_block_type_t;
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| 34 |
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| 35 | typedef enum {
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| 36 | AVS_I_FRAME = 0x00,
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| 37 | AVS_P_FRAME_3X3 = 0x01,
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| 38 | AVS_P_FRAME_2X2 = 0x02,
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| 39 | AVS_P_FRAME_2X3 = 0x03,
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| 40 | } avs_video_sub_type_t;
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| 41 |
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| 42 |
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| 43 | static int
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| 44 | avs_decode_frame(AVCodecContext * avctx,
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| 45 | void *data, int *data_size, uint8_t * buf, int buf_size)
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| 46 | {
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| 47 | avs_context_t *const avs = avctx->priv_data;
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| 48 | AVFrame *picture = data;
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| 49 | AVFrame *const p = (AVFrame *) & avs->picture;
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| 50 | uint8_t *table, *vect, *out;
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| 51 | int i, j, x, y, stride, vect_w = 3, vect_h = 3;
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| 52 | int sub_type;
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| 53 | avs_block_type_t type;
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| 54 | GetBitContext change_map;
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| 55 |
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| 56 | if (avctx->reget_buffer(avctx, p)) {
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| 57 | av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
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| 58 | return -1;
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| 59 | }
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| 60 | p->reference = 1;
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| 61 | p->pict_type = FF_P_TYPE;
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| 62 | p->key_frame = 0;
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| 63 |
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| 64 | out = avs->picture.data[0];
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| 65 | stride = avs->picture.linesize[0];
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| 66 |
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| 67 | sub_type = buf[0];
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| 68 | type = buf[1];
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| 69 | buf += 4;
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| 70 |
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| 71 | if (type == AVS_PALETTE) {
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| 72 | int first, last;
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| 73 | uint32_t *pal = (uint32_t *) avs->picture.data[1];
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| 74 |
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| 75 | first = LE_16(buf);
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| 76 | last = first + LE_16(buf + 2);
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| 77 | buf += 4;
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| 78 | for (i=first; i<last; i++, buf+=3)
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| 79 | pal[i] = (buf[0] << 18) | (buf[1] << 10) | (buf[2] << 2);
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| 80 |
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| 81 | sub_type = buf[0];
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| 82 | type = buf[1];
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| 83 | buf += 4;
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| 84 | }
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| 85 |
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| 86 | if (type != AVS_VIDEO)
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| 87 | return -1;
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| 88 |
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| 89 | switch (sub_type) {
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| 90 | case AVS_I_FRAME:
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| 91 | p->pict_type = FF_I_TYPE;
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| 92 | p->key_frame = 1;
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| 93 | case AVS_P_FRAME_3X3:
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| 94 | vect_w = 3;
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| 95 | vect_h = 3;
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| 96 | break;
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| 97 |
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| 98 | case AVS_P_FRAME_2X2:
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| 99 | vect_w = 2;
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| 100 | vect_h = 2;
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| 101 | break;
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| 102 |
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| 103 | case AVS_P_FRAME_2X3:
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| 104 | vect_w = 2;
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| 105 | vect_h = 3;
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| 106 | break;
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| 107 |
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| 108 | default:
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| 109 | return -1;
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| 110 | }
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| 111 |
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| 112 | table = buf + (256 * vect_w * vect_h);
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| 113 | if (sub_type != AVS_I_FRAME) {
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| 114 | int map_size = ((318 / vect_w + 7) / 8) * (198 / vect_h);
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| 115 | init_get_bits(&change_map, table, map_size);
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| 116 | table += map_size;
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| 117 | }
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| 118 |
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| 119 | for (y=0; y<198; y+=vect_h) {
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| 120 | for (x=0; x<318; x+=vect_w) {
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| 121 | if (sub_type == AVS_I_FRAME || get_bits1(&change_map)) {
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| 122 | vect = &buf[*table++ * (vect_w * vect_h)];
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| 123 | for (j=0; j<vect_w; j++) {
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| 124 | out[(y + 0) * stride + x + j] = vect[(0 * vect_w) + j];
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| 125 | out[(y + 1) * stride + x + j] = vect[(1 * vect_w) + j];
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| 126 | if (vect_h == 3)
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| 127 | out[(y + 2) * stride + x + j] =
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| 128 | vect[(2 * vect_w) + j];
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| 129 | }
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| 130 | }
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| 131 | }
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| 132 | if (sub_type != AVS_I_FRAME)
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| 133 | align_get_bits(&change_map);
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| 134 | }
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| 135 |
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| 136 | *picture = *(AVFrame *) & avs->picture;
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| 137 | *data_size = sizeof(AVPicture);
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| 138 |
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| 139 | return buf_size;
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| 140 | }
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| 141 |
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| 142 | static int avs_decode_init(AVCodecContext * avctx)
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| 143 | {
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| 144 | avctx->pix_fmt = PIX_FMT_PAL8;
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| 145 | return 0;
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| 146 | }
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| 147 |
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| 148 | AVCodec avs_decoder = {
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| 149 | "avs",
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| 150 | CODEC_TYPE_VIDEO,
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| 151 | CODEC_ID_AVS,
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| 152 | sizeof(avs_context_t),
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| 153 | avs_decode_init,
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| 154 | NULL,
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| 155 | NULL,
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| 156 | avs_decode_frame,
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| 157 | CODEC_CAP_DR1,
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| 158 | };
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