| 1 | /* |
| 2 | * Bitmap Brothers JV video decoder |
| 3 | * Copyright (c) 2011 Peter Ross <pross@xvid.org> |
| 4 | * |
| 5 | * This file is part of FFmpeg. |
| 6 | * |
| 7 | * FFmpeg is free software; you can redistribute it and/or |
| 8 | * modify it under the terms of the GNU Lesser General Public |
| 9 | * License as published by the Free Software Foundation; either |
| 10 | * version 2.1 of the License, or (at your option) any later version. |
| 11 | * |
| 12 | * FFmpeg is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 15 | * Lesser General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU Lesser General Public |
| 18 | * License along with FFmpeg; if not, write to the Free Software |
| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 20 | */ |
| 21 | |
| 22 | /** |
| 23 | * @file |
| 24 | * Bitmap Brothers JV video decoder |
| 25 | * @author Peter Ross <pross@xvid.org> |
| 26 | */ |
| 27 | |
| 28 | #include "libavutil/intreadwrite.h" |
| 29 | |
| 30 | #include "avcodec.h" |
| 31 | #include "blockdsp.h" |
| 32 | #include "get_bits.h" |
| 33 | #include "internal.h" |
| 34 | |
| 35 | typedef struct JvContext { |
| 36 | BlockDSPContext bdsp; |
| 37 | AVFrame *frame; |
| 38 | uint32_t palette[AVPALETTE_COUNT]; |
| 39 | int palette_has_changed; |
| 40 | } JvContext; |
| 41 | |
| 42 | static av_cold int decode_init(AVCodecContext *avctx) |
| 43 | { |
| 44 | JvContext *s = avctx->priv_data; |
| 45 | |
| 46 | s->frame = av_frame_alloc(); |
| 47 | if (!s->frame) |
| 48 | return AVERROR(ENOMEM); |
| 49 | |
| 50 | avctx->pix_fmt = AV_PIX_FMT_PAL8; |
| 51 | ff_blockdsp_init(&s->bdsp, avctx); |
| 52 | return 0; |
| 53 | } |
| 54 | |
| 55 | /** |
| 56 | * Decode 2x2 block |
| 57 | */ |
| 58 | static inline void decode2x2(GetBitContext *gb, uint8_t *dst, int linesize) |
| 59 | { |
| 60 | int i, j, v[2]; |
| 61 | |
| 62 | switch (get_bits(gb, 2)) { |
| 63 | case 1: |
| 64 | v[0] = get_bits(gb, 8); |
| 65 | for (j = 0; j < 2; j++) |
| 66 | memset(dst + j * linesize, v[0], 2); |
| 67 | break; |
| 68 | case 2: |
| 69 | v[0] = get_bits(gb, 8); |
| 70 | v[1] = get_bits(gb, 8); |
| 71 | for (j = 0; j < 2; j++) |
| 72 | for (i = 0; i < 2; i++) |
| 73 | dst[j * linesize + i] = v[get_bits1(gb)]; |
| 74 | break; |
| 75 | case 3: |
| 76 | for (j = 0; j < 2; j++) |
| 77 | for (i = 0; i < 2; i++) |
| 78 | dst[j * linesize + i] = get_bits(gb, 8); |
| 79 | } |
| 80 | } |
| 81 | |
| 82 | /** |
| 83 | * Decode 4x4 block |
| 84 | */ |
| 85 | static inline void decode4x4(GetBitContext *gb, uint8_t *dst, int linesize) |
| 86 | { |
| 87 | int i, j, v[2]; |
| 88 | |
| 89 | switch (get_bits(gb, 2)) { |
| 90 | case 1: |
| 91 | v[0] = get_bits(gb, 8); |
| 92 | for (j = 0; j < 4; j++) |
| 93 | memset(dst + j * linesize, v[0], 4); |
| 94 | break; |
| 95 | case 2: |
| 96 | v[0] = get_bits(gb, 8); |
| 97 | v[1] = get_bits(gb, 8); |
| 98 | for (j = 2; j >= 0; j -= 2) { |
| 99 | for (i = 0; i < 4; i++) |
| 100 | dst[j * linesize + i] = v[get_bits1(gb)]; |
| 101 | for (i = 0; i < 4; i++) |
| 102 | dst[(j + 1) * linesize + i] = v[get_bits1(gb)]; |
| 103 | } |
| 104 | break; |
| 105 | case 3: |
| 106 | for (j = 0; j < 4; j += 2) |
| 107 | for (i = 0; i < 4; i += 2) |
| 108 | decode2x2(gb, dst + j * linesize + i, linesize); |
| 109 | } |
| 110 | } |
| 111 | |
| 112 | /** |
| 113 | * Decode 8x8 block |
| 114 | */ |
| 115 | static inline void decode8x8(GetBitContext *gb, uint8_t *dst, int linesize, |
| 116 | BlockDSPContext *bdsp) |
| 117 | { |
| 118 | int i, j, v[2]; |
| 119 | |
| 120 | switch (get_bits(gb, 2)) { |
| 121 | case 1: |
| 122 | v[0] = get_bits(gb, 8); |
| 123 | bdsp->fill_block_tab[1](dst, v[0], linesize, 8); |
| 124 | break; |
| 125 | case 2: |
| 126 | v[0] = get_bits(gb, 8); |
| 127 | v[1] = get_bits(gb, 8); |
| 128 | for (j = 7; j >= 0; j--) |
| 129 | for (i = 0; i < 8; i++) |
| 130 | dst[j * linesize + i] = v[get_bits1(gb)]; |
| 131 | break; |
| 132 | case 3: |
| 133 | for (j = 0; j < 8; j += 4) |
| 134 | for (i = 0; i < 8; i += 4) |
| 135 | decode4x4(gb, dst + j * linesize + i, linesize); |
| 136 | } |
| 137 | } |
| 138 | |
| 139 | static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, |
| 140 | AVPacket *avpkt) |
| 141 | { |
| 142 | JvContext *s = avctx->priv_data; |
| 143 | const uint8_t *buf = avpkt->data; |
| 144 | const uint8_t *buf_end = buf + avpkt->size; |
| 145 | int video_size, video_type, i, j, ret; |
| 146 | |
| 147 | if (avpkt->size < 6) |
| 148 | return AVERROR_INVALIDDATA; |
| 149 | |
| 150 | video_size = AV_RL32(buf); |
| 151 | video_type = buf[4]; |
| 152 | buf += 5; |
| 153 | |
| 154 | if (video_size) { |
| 155 | if (video_size < 0 || video_size > avpkt->size - 5) { |
| 156 | av_log(avctx, AV_LOG_ERROR, "video size %d invalid\n", video_size); |
| 157 | return AVERROR_INVALIDDATA; |
| 158 | } |
| 159 | if ((ret = ff_reget_buffer(avctx, s->frame)) < 0) |
| 160 | return ret; |
| 161 | |
| 162 | if (video_type == 0 || video_type == 1) { |
| 163 | GetBitContext gb; |
| 164 | init_get_bits(&gb, buf, 8 * video_size); |
| 165 | |
| 166 | for (j = 0; j < avctx->height; j += 8) |
| 167 | for (i = 0; i < avctx->width; i += 8) |
| 168 | decode8x8(&gb, |
| 169 | s->frame->data[0] + j * s->frame->linesize[0] + i, |
| 170 | s->frame->linesize[0], &s->bdsp); |
| 171 | |
| 172 | buf += video_size; |
| 173 | } else if (video_type == 2) { |
| 174 | int v = *buf++; |
| 175 | for (j = 0; j < avctx->height; j++) |
| 176 | memset(s->frame->data[0] + j * s->frame->linesize[0], |
| 177 | v, avctx->width); |
| 178 | } else { |
| 179 | av_log(avctx, AV_LOG_WARNING, |
| 180 | "unsupported frame type %i\n", video_type); |
| 181 | return AVERROR_INVALIDDATA; |
| 182 | } |
| 183 | } |
| 184 | |
| 185 | if (buf_end - buf >= AVPALETTE_COUNT * 3) { |
| 186 | for (i = 0; i < AVPALETTE_COUNT; i++) { |
| 187 | uint32_t pal = AV_RB24(buf); |
| 188 | s->palette[i] = 0xFFU << 24 | pal << 2 | ((pal >> 4) & 0x30303); |
| 189 | buf += 3; |
| 190 | } |
| 191 | s->palette_has_changed = 1; |
| 192 | } |
| 193 | |
| 194 | if (video_size) { |
| 195 | s->frame->key_frame = 1; |
| 196 | s->frame->pict_type = AV_PICTURE_TYPE_I; |
| 197 | s->frame->palette_has_changed = s->palette_has_changed; |
| 198 | s->palette_has_changed = 0; |
| 199 | memcpy(s->frame->data[1], s->palette, AVPALETTE_SIZE); |
| 200 | |
| 201 | if ((ret = av_frame_ref(data, s->frame)) < 0) |
| 202 | return ret; |
| 203 | *got_frame = 1; |
| 204 | } |
| 205 | |
| 206 | return avpkt->size; |
| 207 | } |
| 208 | |
| 209 | static av_cold int decode_close(AVCodecContext *avctx) |
| 210 | { |
| 211 | JvContext *s = avctx->priv_data; |
| 212 | |
| 213 | av_frame_free(&s->frame); |
| 214 | |
| 215 | return 0; |
| 216 | } |
| 217 | |
| 218 | AVCodec ff_jv_decoder = { |
| 219 | .name = "jv", |
| 220 | .long_name = NULL_IF_CONFIG_SMALL("Bitmap Brothers JV video"), |
| 221 | .type = AVMEDIA_TYPE_VIDEO, |
| 222 | .id = AV_CODEC_ID_JV, |
| 223 | .priv_data_size = sizeof(JvContext), |
| 224 | .init = decode_init, |
| 225 | .close = decode_close, |
| 226 | .decode = decode_frame, |
| 227 | .capabilities = CODEC_CAP_DR1, |
| 228 | }; |