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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4349 | Serge | 1 | /* |
| 2 | * Miro VideoXL codec |
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| 3 | * Copyright (c) 2004 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 | * Miro VideoXL codec. |
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| 25 | */ |
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| 26 | |||
| 27 | #include "libavutil/common.h" |
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| 28 | #include "libavutil/intreadwrite.h" |
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| 29 | #include "avcodec.h" |
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| 30 | #include "internal.h" |
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| 31 | |||
| 32 | static const int xl_table[32] = { |
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| 33 | 0, 1, 2, 3, 4, 5, 6, 7, |
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| 34 | 8, 9, 12, 15, 20, 25, 34, 46, |
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| 35 | 64, 82, 94, 103, 108, 113, 116, 119, |
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| 36 | 120, 121, 122, 123, 124, 125, 126, 127 |
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| 37 | }; |
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| 38 | |||
| 39 | static int decode_frame(AVCodecContext *avctx, |
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| 40 | void *data, int *got_frame, |
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| 41 | AVPacket *avpkt) |
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| 42 | { |
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| 43 | const uint8_t *buf = avpkt->data; |
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| 44 | int buf_size = avpkt->size; |
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| 45 | AVFrame *const p = data; |
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| 46 | uint8_t *Y, *U, *V; |
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| 47 | int i, j, ret; |
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| 48 | int stride; |
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| 49 | uint32_t val; |
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| 50 | int y0, y1, y2, y3 = 0, c0 = 0, c1 = 0; |
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| 51 | |||
| 52 | if (avctx->width % 4) { |
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| 53 | av_log(avctx, AV_LOG_ERROR, "width is not a multiple of 4\n"); |
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| 54 | return AVERROR_INVALIDDATA; |
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| 55 | } |
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| 56 | if (buf_size < avctx->width * avctx->height) { |
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| 57 | av_log(avctx, AV_LOG_ERROR, "Packet is too small\n"); |
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| 58 | return AVERROR_INVALIDDATA; |
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| 59 | } |
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| 60 | |||
| 61 | if ((ret = ff_get_buffer(avctx, p, 0)) < 0) |
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| 62 | return ret; |
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| 63 | p->pict_type = AV_PICTURE_TYPE_I; |
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| 64 | p->key_frame = 1; |
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| 65 | |||
| 66 | Y = p->data[0]; |
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| 67 | U = p->data[1]; |
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| 68 | V = p->data[2]; |
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| 69 | |||
| 70 | stride = avctx->width - 4; |
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| 71 | |||
| 72 | for (i = 0; i < avctx->height; i++) { |
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| 73 | /* lines are stored in reversed order */ |
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| 74 | buf += stride; |
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| 75 | |||
| 76 | for (j = 0; j < avctx->width; j += 4) { |
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| 77 | /* value is stored in LE dword with word swapped */ |
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| 78 | val = AV_RL32(buf); |
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| 79 | buf -= 4; |
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| 80 | val = ((val >> 16) & 0xFFFF) | ((val & 0xFFFF) << 16); |
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| 81 | |||
| 82 | if (!j) |
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| 83 | y0 = (val & 0x1F) << 2; |
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| 84 | else |
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| 85 | y0 = y3 + xl_table[val & 0x1F]; |
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| 86 | val >>= 5; |
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| 87 | y1 = y0 + xl_table[val & 0x1F]; |
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| 88 | val >>= 5; |
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| 89 | y2 = y1 + xl_table[val & 0x1F]; |
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| 90 | val >>= 6; /* align to word */ |
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| 91 | y3 = y2 + xl_table[val & 0x1F]; |
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| 92 | val >>= 5; |
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| 93 | if (!j) |
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| 94 | c0 = (val & 0x1F) << 2; |
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| 95 | else |
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| 96 | c0 += xl_table[val & 0x1F]; |
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| 97 | val >>= 5; |
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| 98 | if (!j) |
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| 99 | c1 = (val & 0x1F) << 2; |
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| 100 | else |
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| 101 | c1 += xl_table[val & 0x1F]; |
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| 102 | |||
| 103 | Y[j + 0] = y0 << 1; |
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| 104 | Y[j + 1] = y1 << 1; |
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| 105 | Y[j + 2] = y2 << 1; |
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| 106 | Y[j + 3] = y3 << 1; |
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| 107 | |||
| 108 | U[j >> 2] = c0 << 1; |
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| 109 | V[j >> 2] = c1 << 1; |
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| 110 | } |
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| 111 | |||
| 112 | buf += avctx->width + 4; |
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| 113 | Y += p->linesize[0]; |
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| 114 | U += p->linesize[1]; |
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| 115 | V += p->linesize[2]; |
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| 116 | } |
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| 117 | |||
| 118 | *got_frame = 1; |
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| 119 | |||
| 120 | return buf_size; |
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| 121 | } |
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| 122 | |||
| 123 | static av_cold int decode_init(AVCodecContext *avctx) |
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| 124 | { |
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| 125 | avctx->pix_fmt = AV_PIX_FMT_YUV411P; |
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| 126 | |||
| 127 | return 0; |
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| 128 | } |
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| 129 | |||
| 130 | AVCodec ff_xl_decoder = { |
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| 131 | .name = "xl", |
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| 132 | .long_name = NULL_IF_CONFIG_SMALL("Miro VideoXL"), |
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| 133 | .type = AVMEDIA_TYPE_VIDEO, |
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| 134 | .id = AV_CODEC_ID_VIXL, |
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| 135 | .init = decode_init, |
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| 136 | .decode = decode_frame, |
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| 137 | .capabilities = CODEC_CAP_DR1, |
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| 138 | }; |