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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4349 | Serge | 1 | /* |
| 2 | * SGI RLE 8-bit decoder |
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| 3 | * Copyright (c) 2012 Peter Ross |
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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 | * SGI RLE 8-bit decoder |
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| 25 | */ |
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| 26 | |||
| 27 | #include "avcodec.h" |
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| 28 | #include "internal.h" |
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| 29 | |||
| 30 | typedef struct SGIRLEContext { |
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| 31 | AVFrame *frame; |
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| 32 | } SGIRLEContext; |
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| 33 | |||
| 34 | static av_cold int sgirle_decode_init(AVCodecContext *avctx) |
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| 35 | { |
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| 36 | SGIRLEContext *s = avctx->priv_data; |
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| 37 | avctx->pix_fmt = AV_PIX_FMT_BGR8; |
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| 38 | s->frame = av_frame_alloc(); |
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| 39 | if (!s->frame) |
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| 40 | return AVERROR(ENOMEM); |
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| 41 | return 0; |
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| 42 | } |
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| 43 | |||
| 44 | /** |
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| 45 | * Convert SGI RGB332 pixel into AV_PIX_FMT_BGR8 |
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| 46 | * SGI RGB332 is packed RGB 3:3:2, 8bpp, (msb)3R 2B 3G(lsb) |
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| 47 | */ |
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| 48 | #define RGB332_TO_BGR8(x) (((x << 3) & 0xC0) | ((x << 3) & 0x38) | ((x >> 5) & 7)) |
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| 49 | |||
| 50 | static av_always_inline void memcpy_rgb332_to_bgr8(uint8_t *dst, const uint8_t *src, int size) |
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| 51 | { |
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| 52 | int i; |
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| 53 | for (i = 0; i < size; i++) |
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| 54 | dst[i] = RGB332_TO_BGR8(src[i]); |
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| 55 | } |
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| 56 | |||
| 57 | /** |
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| 58 | * @param[out] dst Destination buffer |
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| 59 | * @param[in] src Source buffer |
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| 60 | * @param src_size Source buffer size (bytes) |
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| 61 | * @param width Width of destination buffer (pixels) |
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| 62 | * @param height Height of destination buffer (pixels) |
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| 63 | * @param linesize Line size of destination buffer (bytes) |
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| 64 | * @return <0 on error |
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| 65 | */ |
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| 66 | static int decode_sgirle8(AVCodecContext *avctx, uint8_t *dst, const uint8_t *src, int src_size, int width, int height, int linesize) |
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| 67 | { |
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| 68 | const uint8_t *src_end = src + src_size; |
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| 69 | int x = 0, y = 0; |
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| 70 | |||
| 71 | #define INC_XY(n) \ |
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| 72 | x += n; \ |
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| 73 | if (x >= width) { \ |
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| 74 | y++; \ |
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| 75 | if (y >= height) \ |
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| 76 | return 0; \ |
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| 77 | x = 0; \ |
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| 78 | } |
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| 79 | |||
| 80 | while (src_end - src >= 2) { |
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| 81 | uint8_t v = *src++; |
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| 82 | if (v > 0 && v < 0xC0) { |
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| 83 | do { |
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| 84 | int length = FFMIN(v, width - x); |
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| 85 | if (length <= 0) |
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| 86 | break; |
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| 87 | memset(dst + y*linesize + x, RGB332_TO_BGR8(*src), length); |
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| 88 | INC_XY(length); |
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| 89 | v -= length; |
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| 90 | } while (v > 0); |
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| 91 | src++; |
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| 92 | } else if (v >= 0xC1) { |
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| 93 | v -= 0xC0; |
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| 94 | do { |
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| 95 | int length = FFMIN3(v, width - x, src_end - src); |
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| 96 | if (src_end - src < length || length <= 0) |
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| 97 | break; |
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| 98 | memcpy_rgb332_to_bgr8(dst + y*linesize + x, src, length); |
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| 99 | INC_XY(length); |
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| 100 | src += length; |
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| 101 | v -= length; |
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| 102 | } while (v > 0); |
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| 103 | } else { |
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| 104 | avpriv_request_sample(avctx, "opcode %d", v); |
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| 105 | return AVERROR_PATCHWELCOME; |
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| 106 | } |
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| 107 | } |
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| 108 | return 0; |
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| 109 | } |
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| 110 | |||
| 111 | static int sgirle_decode_frame(AVCodecContext *avctx, |
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| 112 | void *data, int *got_frame, |
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| 113 | AVPacket *avpkt) |
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| 114 | { |
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| 115 | SGIRLEContext *s = avctx->priv_data; |
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| 116 | int ret; |
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| 117 | |||
| 118 | if ((ret = ff_reget_buffer(avctx, s->frame)) < 0) |
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| 119 | return ret; |
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| 120 | |||
| 121 | ret = decode_sgirle8(avctx, s->frame->data[0], avpkt->data, avpkt->size, avctx->width, avctx->height, s->frame->linesize[0]); |
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| 122 | if (ret < 0) |
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| 123 | return ret; |
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| 124 | |||
| 125 | *got_frame = 1; |
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| 126 | if ((ret = av_frame_ref(data, s->frame)) < 0) |
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| 127 | return ret; |
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| 128 | |||
| 129 | return avpkt->size; |
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| 130 | } |
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| 131 | |||
| 132 | static av_cold int sgirle_decode_end(AVCodecContext *avctx) |
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| 133 | { |
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| 134 | SGIRLEContext *s = avctx->priv_data; |
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| 135 | |||
| 136 | av_frame_free(&s->frame); |
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| 137 | |||
| 138 | return 0; |
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| 139 | } |
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| 140 | |||
| 141 | AVCodec ff_sgirle_decoder = { |
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| 142 | .name = "sgirle", |
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| 143 | .long_name = NULL_IF_CONFIG_SMALL("SGI RLE 8-bit"), |
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| 144 | .type = AVMEDIA_TYPE_VIDEO, |
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| 145 | .id = AV_CODEC_ID_SGIRLE, |
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| 146 | .priv_data_size = sizeof(SGIRLEContext), |
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| 147 | .init = sgirle_decode_init, |
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| 148 | .close = sgirle_decode_end, |
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| 149 | .decode = sgirle_decode_frame, |
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| 150 | .capabilities = CODEC_CAP_DR1, |
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| 151 | }; |