| 1 | /* |
| 2 | * Intel Indeo 2 codec |
| 3 | * Copyright (c) 2005 Konstantin Shishkov |
| 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 | * Intel Indeo 2 decoder. |
| 25 | */ |
| 26 | |
| 27 | #define BITSTREAM_READER_LE |
| 28 | #include "libavutil/attributes.h" |
| 29 | #include "avcodec.h" |
| 30 | #include "get_bits.h" |
| 31 | #include "indeo2data.h" |
| 32 | #include "internal.h" |
| 33 | #include "mathops.h" |
| 34 | |
| 35 | typedef struct Ir2Context{ |
| 36 | AVCodecContext *avctx; |
| 37 | AVFrame *picture; |
| 38 | GetBitContext gb; |
| 39 | int decode_delta; |
| 40 | } Ir2Context; |
| 41 | |
| 42 | #define CODE_VLC_BITS 14 |
| 43 | static VLC ir2_vlc; |
| 44 | |
| 45 | /* Indeo 2 codes are in range 0x01..0x7F and 0x81..0x90 */ |
| 46 | static inline int ir2_get_code(GetBitContext *gb) |
| 47 | { |
| 48 | return get_vlc2(gb, ir2_vlc.table, CODE_VLC_BITS, 1) + 1; |
| 49 | } |
| 50 | |
| 51 | static int ir2_decode_plane(Ir2Context *ctx, int width, int height, uint8_t *dst, |
| 52 | int pitch, const uint8_t *table) |
| 53 | { |
| 54 | int i; |
| 55 | int j; |
| 56 | int out = 0; |
| 57 | int c; |
| 58 | int t; |
| 59 | |
| 60 | if (width & 1) |
| 61 | return AVERROR_INVALIDDATA; |
| 62 | |
| 63 | /* first line contain absolute values, other lines contain deltas */ |
| 64 | while (out < width) { |
| 65 | c = ir2_get_code(&ctx->gb); |
| 66 | if (c >= 0x80) { /* we have a run */ |
| 67 | c -= 0x7F; |
| 68 | if (out + c*2 > width) |
| 69 | return AVERROR_INVALIDDATA; |
| 70 | for (i = 0; i < c * 2; i++) |
| 71 | dst[out++] = 0x80; |
| 72 | } else { /* copy two values from table */ |
| 73 | dst[out++] = table[c * 2]; |
| 74 | dst[out++] = table[(c * 2) + 1]; |
| 75 | } |
| 76 | } |
| 77 | dst += pitch; |
| 78 | |
| 79 | for (j = 1; j < height; j++) { |
| 80 | out = 0; |
| 81 | while (out < width) { |
| 82 | c = ir2_get_code(&ctx->gb); |
| 83 | if (c >= 0x80) { /* we have a skip */ |
| 84 | c -= 0x7F; |
| 85 | if (out + c*2 > width) |
| 86 | return AVERROR_INVALIDDATA; |
| 87 | for (i = 0; i < c * 2; i++) { |
| 88 | dst[out] = dst[out - pitch]; |
| 89 | out++; |
| 90 | } |
| 91 | } else { /* add two deltas from table */ |
| 92 | t = dst[out - pitch] + (table[c * 2] - 128); |
| 93 | t = av_clip_uint8(t); |
| 94 | dst[out] = t; |
| 95 | out++; |
| 96 | t = dst[out - pitch] + (table[(c * 2) + 1] - 128); |
| 97 | t = av_clip_uint8(t); |
| 98 | dst[out] = t; |
| 99 | out++; |
| 100 | } |
| 101 | } |
| 102 | dst += pitch; |
| 103 | } |
| 104 | return 0; |
| 105 | } |
| 106 | |
| 107 | static int ir2_decode_plane_inter(Ir2Context *ctx, int width, int height, uint8_t *dst, |
| 108 | int pitch, const uint8_t *table) |
| 109 | { |
| 110 | int j; |
| 111 | int out = 0; |
| 112 | int c; |
| 113 | int t; |
| 114 | |
| 115 | if (width & 1) |
| 116 | return AVERROR_INVALIDDATA; |
| 117 | |
| 118 | for (j = 0; j < height; j++) { |
| 119 | out = 0; |
| 120 | while (out < width) { |
| 121 | c = ir2_get_code(&ctx->gb); |
| 122 | if (c >= 0x80) { /* we have a skip */ |
| 123 | c -= 0x7F; |
| 124 | out += c * 2; |
| 125 | } else { /* add two deltas from table */ |
| 126 | t = dst[out] + (((table[c * 2] - 128)*3) >> 2); |
| 127 | t = av_clip_uint8(t); |
| 128 | dst[out] = t; |
| 129 | out++; |
| 130 | t = dst[out] + (((table[(c * 2) + 1] - 128)*3) >> 2); |
| 131 | t = av_clip_uint8(t); |
| 132 | dst[out] = t; |
| 133 | out++; |
| 134 | } |
| 135 | } |
| 136 | dst += pitch; |
| 137 | } |
| 138 | return 0; |
| 139 | } |
| 140 | |
| 141 | static int ir2_decode_frame(AVCodecContext *avctx, |
| 142 | void *data, int *got_frame, |
| 143 | AVPacket *avpkt) |
| 144 | { |
| 145 | Ir2Context * const s = avctx->priv_data; |
| 146 | const uint8_t *buf = avpkt->data; |
| 147 | int buf_size = avpkt->size; |
| 148 | AVFrame *picture = data; |
| 149 | AVFrame * const p = s->picture; |
| 150 | int start, ret; |
| 151 | |
| 152 | if ((ret = ff_reget_buffer(avctx, p)) < 0) |
| 153 | return ret; |
| 154 | |
| 155 | start = 48; /* hardcoded for now */ |
| 156 | |
| 157 | if (start >= buf_size) { |
| 158 | av_log(s->avctx, AV_LOG_ERROR, "input buffer size too small (%d)\n", buf_size); |
| 159 | return AVERROR_INVALIDDATA; |
| 160 | } |
| 161 | |
| 162 | s->decode_delta = buf[18]; |
| 163 | |
| 164 | /* decide whether frame uses deltas or not */ |
| 165 | #ifndef BITSTREAM_READER_LE |
| 166 | for (i = 0; i < buf_size; i++) |
| 167 | buf[i] = ff_reverse[buf[i]]; |
| 168 | #endif |
| 169 | |
| 170 | init_get_bits(&s->gb, buf + start, (buf_size - start) * 8); |
| 171 | |
| 172 | if (s->decode_delta) { /* intraframe */ |
| 173 | if ((ret = ir2_decode_plane(s, avctx->width, avctx->height, |
| 174 | p->data[0], p->linesize[0], |
| 175 | ir2_luma_table)) < 0) |
| 176 | return ret; |
| 177 | |
| 178 | /* swapped U and V */ |
| 179 | if ((ret = ir2_decode_plane(s, avctx->width >> 2, avctx->height >> 2, |
| 180 | p->data[2], p->linesize[2], |
| 181 | ir2_luma_table)) < 0) |
| 182 | return ret; |
| 183 | if ((ret = ir2_decode_plane(s, avctx->width >> 2, avctx->height >> 2, |
| 184 | p->data[1], p->linesize[1], |
| 185 | ir2_luma_table)) < 0) |
| 186 | return ret; |
| 187 | } else { /* interframe */ |
| 188 | if ((ret = ir2_decode_plane_inter(s, avctx->width, avctx->height, |
| 189 | p->data[0], p->linesize[0], |
| 190 | ir2_luma_table)) < 0) |
| 191 | return ret; |
| 192 | /* swapped U and V */ |
| 193 | if ((ret = ir2_decode_plane_inter(s, avctx->width >> 2, avctx->height >> 2, |
| 194 | p->data[2], p->linesize[2], |
| 195 | ir2_luma_table)) < 0) |
| 196 | return ret; |
| 197 | if ((ret = ir2_decode_plane_inter(s, avctx->width >> 2, avctx->height >> 2, |
| 198 | p->data[1], p->linesize[1], |
| 199 | ir2_luma_table)) < 0) |
| 200 | return ret; |
| 201 | } |
| 202 | |
| 203 | if ((ret = av_frame_ref(picture, p)) < 0) |
| 204 | return ret; |
| 205 | |
| 206 | *got_frame = 1; |
| 207 | |
| 208 | return buf_size; |
| 209 | } |
| 210 | |
| 211 | static av_cold int ir2_decode_init(AVCodecContext *avctx) |
| 212 | { |
| 213 | Ir2Context * const ic = avctx->priv_data; |
| 214 | static VLC_TYPE vlc_tables[1 << CODE_VLC_BITS][2]; |
| 215 | |
| 216 | ic->avctx = avctx; |
| 217 | |
| 218 | avctx->pix_fmt= AV_PIX_FMT_YUV410P; |
| 219 | |
| 220 | ic->picture = av_frame_alloc(); |
| 221 | if (!ic->picture) |
| 222 | return AVERROR(ENOMEM); |
| 223 | |
| 224 | ir2_vlc.table = vlc_tables; |
| 225 | ir2_vlc.table_allocated = 1 << CODE_VLC_BITS; |
| 226 | #ifdef BITSTREAM_READER_LE |
| 227 | init_vlc(&ir2_vlc, CODE_VLC_BITS, IR2_CODES, |
| 228 | &ir2_codes[0][1], 4, 2, |
| 229 | &ir2_codes[0][0], 4, 2, INIT_VLC_USE_NEW_STATIC | INIT_VLC_LE); |
| 230 | #else |
| 231 | init_vlc(&ir2_vlc, CODE_VLC_BITS, IR2_CODES, |
| 232 | &ir2_codes[0][1], 4, 2, |
| 233 | &ir2_codes[0][0], 4, 2, INIT_VLC_USE_NEW_STATIC); |
| 234 | #endif |
| 235 | |
| 236 | return 0; |
| 237 | } |
| 238 | |
| 239 | static av_cold int ir2_decode_end(AVCodecContext *avctx) |
| 240 | { |
| 241 | Ir2Context * const ic = avctx->priv_data; |
| 242 | |
| 243 | av_frame_free(&ic->picture); |
| 244 | |
| 245 | return 0; |
| 246 | } |
| 247 | |
| 248 | AVCodec ff_indeo2_decoder = { |
| 249 | .name = "indeo2", |
| 250 | .long_name = NULL_IF_CONFIG_SMALL("Intel Indeo 2"), |
| 251 | .type = AVMEDIA_TYPE_VIDEO, |
| 252 | .id = AV_CODEC_ID_INDEO2, |
| 253 | .priv_data_size = sizeof(Ir2Context), |
| 254 | .init = ir2_decode_init, |
| 255 | .close = ir2_decode_end, |
| 256 | .decode = ir2_decode_frame, |
| 257 | .capabilities = CODEC_CAP_DR1, |
| 258 | }; |