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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4349 | Serge | 1 | /* |
| 2 | * Intel Indeo 2 codec |
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| 3 | * Copyright (c) 2005 Konstantin Shishkov |
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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 | * Intel Indeo 2 decoder. |
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| 25 | */ |
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| 26 | |||
| 27 | #define BITSTREAM_READER_LE |
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| 28 | #include "libavutil/attributes.h" |
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| 29 | #include "avcodec.h" |
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| 30 | #include "get_bits.h" |
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| 31 | #include "indeo2data.h" |
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| 32 | #include "internal.h" |
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| 33 | #include "mathops.h" |
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| 34 | |||
| 35 | typedef struct Ir2Context{ |
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| 36 | AVCodecContext *avctx; |
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| 37 | AVFrame *picture; |
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| 38 | GetBitContext gb; |
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| 39 | int decode_delta; |
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| 40 | } Ir2Context; |
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| 41 | |||
| 42 | #define CODE_VLC_BITS 14 |
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| 43 | static VLC ir2_vlc; |
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| 44 | |||
| 45 | /* Indeo 2 codes are in range 0x01..0x7F and 0x81..0x90 */ |
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| 46 | static inline int ir2_get_code(GetBitContext *gb) |
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| 47 | { |
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| 48 | return get_vlc2(gb, ir2_vlc.table, CODE_VLC_BITS, 1) + 1; |
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| 49 | } |
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| 50 | |||
| 51 | static int ir2_decode_plane(Ir2Context *ctx, int width, int height, uint8_t *dst, |
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| 52 | int stride, const uint8_t *table) |
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| 53 | { |
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| 54 | int i; |
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| 55 | int j; |
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| 56 | int out = 0; |
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| 57 | int c; |
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| 58 | int t; |
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| 59 | |||
| 60 | if (width & 1) |
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| 61 | return AVERROR_INVALIDDATA; |
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| 62 | |||
| 63 | /* first line contain absolute values, other lines contain deltas */ |
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| 64 | while (out < width) { |
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| 65 | c = ir2_get_code(&ctx->gb); |
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| 66 | if (c >= 0x80) { /* we have a run */ |
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| 67 | c -= 0x7F; |
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| 68 | if (out + c*2 > width) |
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| 69 | return AVERROR_INVALIDDATA; |
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| 70 | for (i = 0; i < c * 2; i++) |
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| 71 | dst[out++] = 0x80; |
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| 72 | } else { /* copy two values from table */ |
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| 73 | dst[out++] = table[c * 2]; |
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| 74 | dst[out++] = table[(c * 2) + 1]; |
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| 75 | } |
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| 76 | } |
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| 77 | dst += stride; |
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| 78 | |||
| 79 | for (j = 1; j < height; j++) { |
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| 80 | out = 0; |
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| 81 | while (out < width) { |
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| 82 | c = ir2_get_code(&ctx->gb); |
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| 83 | if (c >= 0x80) { /* we have a skip */ |
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| 84 | c -= 0x7F; |
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| 85 | if (out + c*2 > width) |
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| 86 | return AVERROR_INVALIDDATA; |
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| 87 | for (i = 0; i < c * 2; i++) { |
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| 88 | dst[out] = dst[out - stride]; |
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| 89 | out++; |
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| 90 | } |
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| 91 | } else { /* add two deltas from table */ |
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| 92 | t = dst[out - stride] + (table[c * 2] - 128); |
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| 93 | t = av_clip_uint8(t); |
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| 94 | dst[out] = t; |
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| 95 | out++; |
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| 96 | t = dst[out - stride] + (table[(c * 2) + 1] - 128); |
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| 97 | t = av_clip_uint8(t); |
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| 98 | dst[out] = t; |
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| 99 | out++; |
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| 100 | } |
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| 101 | } |
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| 102 | dst += stride; |
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| 103 | } |
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| 104 | return 0; |
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| 105 | } |
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| 106 | |||
| 107 | static int ir2_decode_plane_inter(Ir2Context *ctx, int width, int height, uint8_t *dst, |
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| 108 | int stride, const uint8_t *table) |
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| 109 | { |
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| 110 | int j; |
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| 111 | int out = 0; |
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| 112 | int c; |
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| 113 | int t; |
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| 114 | |||
| 115 | if (width & 1) |
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| 116 | return AVERROR_INVALIDDATA; |
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| 117 | |||
| 118 | for (j = 0; j < height; j++) { |
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| 119 | out = 0; |
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| 120 | while (out < width) { |
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| 121 | c = ir2_get_code(&ctx->gb); |
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| 122 | if (c >= 0x80) { /* we have a skip */ |
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| 123 | c -= 0x7F; |
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| 124 | out += c * 2; |
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| 125 | } else { /* add two deltas from table */ |
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| 126 | t = dst[out] + (((table[c * 2] - 128)*3) >> 2); |
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| 127 | t = av_clip_uint8(t); |
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| 128 | dst[out] = t; |
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| 129 | out++; |
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| 130 | t = dst[out] + (((table[(c * 2) + 1] - 128)*3) >> 2); |
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| 131 | t = av_clip_uint8(t); |
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| 132 | dst[out] = t; |
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| 133 | out++; |
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| 134 | } |
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| 135 | } |
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| 136 | dst += stride; |
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| 137 | } |
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| 138 | return 0; |
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| 139 | } |
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| 140 | |||
| 141 | static int ir2_decode_frame(AVCodecContext *avctx, |
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| 142 | void *data, int *got_frame, |
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| 143 | AVPacket *avpkt) |
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| 144 | { |
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| 145 | Ir2Context * const s = avctx->priv_data; |
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| 146 | const uint8_t *buf = avpkt->data; |
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| 147 | int buf_size = avpkt->size; |
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| 148 | AVFrame *picture = data; |
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| 149 | AVFrame * const p = s->picture; |
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| 150 | int start, ret; |
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| 151 | |||
| 152 | if ((ret = ff_reget_buffer(avctx, p)) < 0) |
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| 153 | return ret; |
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| 154 | |||
| 155 | start = 48; /* hardcoded for now */ |
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| 156 | |||
| 157 | if (start >= buf_size) { |
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| 158 | av_log(s->avctx, AV_LOG_ERROR, "input buffer size too small (%d)\n", buf_size); |
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| 159 | return AVERROR_INVALIDDATA; |
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| 160 | } |
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| 161 | |||
| 162 | s->decode_delta = buf[18]; |
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| 163 | |||
| 164 | /* decide whether frame uses deltas or not */ |
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| 165 | #ifndef BITSTREAM_READER_LE |
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| 166 | for (i = 0; i < buf_size; i++) |
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| 167 | buf[i] = ff_reverse[buf[i]]; |
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| 168 | #endif |
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| 169 | |||
| 170 | init_get_bits(&s->gb, buf + start, (buf_size - start) * 8); |
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| 171 | |||
| 172 | if (s->decode_delta) { /* intraframe */ |
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| 173 | if ((ret = ir2_decode_plane(s, avctx->width, avctx->height, |
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| 174 | s->picture->data[0], s->picture->linesize[0], |
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| 175 | ir2_luma_table)) < 0) |
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| 176 | return ret; |
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| 177 | |||
| 178 | /* swapped U and V */ |
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| 179 | if ((ret = ir2_decode_plane(s, avctx->width >> 2, avctx->height >> 2, |
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| 180 | s->picture->data[2], s->picture->linesize[2], |
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| 181 | ir2_luma_table)) < 0) |
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| 182 | return ret; |
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| 183 | if ((ret = ir2_decode_plane(s, avctx->width >> 2, avctx->height >> 2, |
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| 184 | s->picture->data[1], s->picture->linesize[1], |
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| 185 | ir2_luma_table)) < 0) |
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| 186 | return ret; |
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| 187 | } else { /* interframe */ |
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| 188 | if ((ret = ir2_decode_plane_inter(s, avctx->width, avctx->height, |
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| 189 | s->picture->data[0], s->picture->linesize[0], |
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| 190 | ir2_luma_table)) < 0) |
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| 191 | return ret; |
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| 192 | /* swapped U and V */ |
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| 193 | if ((ret = ir2_decode_plane_inter(s, avctx->width >> 2, avctx->height >> 2, |
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| 194 | s->picture->data[2], s->picture->linesize[2], |
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| 195 | ir2_luma_table)) < 0) |
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| 196 | return ret; |
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| 197 | if ((ret = ir2_decode_plane_inter(s, avctx->width >> 2, avctx->height >> 2, |
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| 198 | s->picture->data[1], s->picture->linesize[1], |
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| 199 | ir2_luma_table)) < 0) |
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| 200 | return ret; |
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| 201 | } |
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| 202 | |||
| 203 | if ((ret = av_frame_ref(picture, s->picture)) < 0) |
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| 204 | return ret; |
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| 205 | |||
| 206 | *got_frame = 1; |
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| 207 | |||
| 208 | return buf_size; |
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| 209 | } |
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| 210 | |||
| 211 | static av_cold int ir2_decode_init(AVCodecContext *avctx) |
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| 212 | { |
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| 213 | Ir2Context * const ic = avctx->priv_data; |
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| 214 | static VLC_TYPE vlc_tables[1 << CODE_VLC_BITS][2]; |
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| 215 | |||
| 216 | ic->avctx = avctx; |
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| 217 | |||
| 218 | avctx->pix_fmt= AV_PIX_FMT_YUV410P; |
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| 219 | |||
| 220 | ic->picture = av_frame_alloc(); |
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| 221 | if (!ic->picture) |
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| 222 | return AVERROR(ENOMEM); |
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| 223 | |||
| 224 | ir2_vlc.table = vlc_tables; |
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| 225 | ir2_vlc.table_allocated = 1 << CODE_VLC_BITS; |
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| 226 | #ifdef BITSTREAM_READER_LE |
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| 227 | init_vlc(&ir2_vlc, CODE_VLC_BITS, IR2_CODES, |
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| 228 | &ir2_codes[0][1], 4, 2, |
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| 229 | &ir2_codes[0][0], 4, 2, INIT_VLC_USE_NEW_STATIC | INIT_VLC_LE); |
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| 230 | #else |
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| 231 | init_vlc(&ir2_vlc, CODE_VLC_BITS, IR2_CODES, |
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| 232 | &ir2_codes[0][1], 4, 2, |
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| 233 | &ir2_codes[0][0], 4, 2, INIT_VLC_USE_NEW_STATIC); |
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| 234 | #endif |
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| 235 | |||
| 236 | return 0; |
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| 237 | } |
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| 238 | |||
| 239 | static av_cold int ir2_decode_end(AVCodecContext *avctx) |
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| 240 | { |
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| 241 | Ir2Context * const ic = avctx->priv_data; |
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| 242 | |||
| 243 | av_frame_free(&ic->picture); |
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| 244 | |||
| 245 | return 0; |
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| 246 | } |
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| 247 | |||
| 248 | AVCodec ff_indeo2_decoder = { |
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| 249 | .name = "indeo2", |
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| 250 | .long_name = NULL_IF_CONFIG_SMALL("Intel Indeo 2"), |
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| 251 | .type = AVMEDIA_TYPE_VIDEO, |
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| 252 | .id = AV_CODEC_ID_INDEO2, |
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| 253 | .priv_data_size = sizeof(Ir2Context), |
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| 254 | .init = ir2_decode_init, |
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| 255 | .close = ir2_decode_end, |
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| 256 | .decode = ir2_decode_frame, |
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| 257 | .capabilities = CODEC_CAP_DR1, |
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| 258 | }; |