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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4349 | Serge | 1 | /* |
| 2 | * Autodesk RLE Decoder |
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| 3 | * Copyright (C) 2005 the ffmpeg project |
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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 | * Autodesk RLE Video Decoder by Konstantin Shishkov |
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| 25 | */ |
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| 26 | |||
| 27 | #include |
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| 28 | #include |
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| 29 | #include |
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| 30 | |||
| 31 | #include "avcodec.h" |
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| 32 | #include "internal.h" |
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| 33 | #include "msrledec.h" |
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| 34 | |||
| 35 | typedef struct AascContext { |
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| 36 | AVCodecContext *avctx; |
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| 37 | GetByteContext gb; |
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| 38 | AVFrame *frame; |
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| 39 | |||
| 40 | uint32_t palette[AVPALETTE_COUNT]; |
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| 41 | int palette_size; |
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| 42 | } AascContext; |
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| 43 | |||
| 44 | static av_cold int aasc_decode_init(AVCodecContext *avctx) |
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| 45 | { |
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| 46 | AascContext *s = avctx->priv_data; |
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| 47 | uint8_t *ptr; |
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| 48 | int i; |
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| 49 | |||
| 50 | s->avctx = avctx; |
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| 51 | switch (avctx->bits_per_coded_sample) { |
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| 52 | case 8: |
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| 53 | avctx->pix_fmt = AV_PIX_FMT_PAL8; |
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| 54 | |||
| 55 | ptr = avctx->extradata; |
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| 56 | s->palette_size = FFMIN(avctx->extradata_size, AVPALETTE_SIZE); |
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| 57 | for (i = 0; i < s->palette_size / 4; i++) { |
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| 58 | s->palette[i] = 0xFFU << 24 | AV_RL32(ptr); |
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| 59 | ptr += 4; |
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| 60 | } |
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| 61 | break; |
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| 62 | case 16: |
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| 63 | avctx->pix_fmt = AV_PIX_FMT_RGB555LE; |
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| 64 | break; |
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| 65 | case 24: |
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| 66 | avctx->pix_fmt = AV_PIX_FMT_BGR24; |
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| 67 | break; |
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| 68 | default: |
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| 69 | av_log(avctx, AV_LOG_ERROR, "Unsupported bit depth: %d\n", avctx->bits_per_coded_sample); |
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| 70 | return -1; |
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| 71 | } |
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| 72 | |||
| 73 | s->frame = av_frame_alloc(); |
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| 74 | if (!s->frame) |
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| 75 | return AVERROR(ENOMEM); |
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| 76 | |||
| 77 | return 0; |
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| 78 | } |
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| 79 | |||
| 80 | static int aasc_decode_frame(AVCodecContext *avctx, |
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| 81 | void *data, int *got_frame, |
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| 82 | AVPacket *avpkt) |
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| 83 | { |
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| 84 | const uint8_t *buf = avpkt->data; |
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| 85 | int buf_size = avpkt->size; |
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| 86 | AascContext *s = avctx->priv_data; |
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| 87 | int compr, i, stride, psize, ret; |
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| 88 | |||
| 89 | if (buf_size < 4) { |
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| 90 | av_log(avctx, AV_LOG_ERROR, "frame too short\n"); |
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| 91 | return AVERROR_INVALIDDATA; |
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| 92 | } |
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| 93 | |||
| 94 | if ((ret = ff_reget_buffer(avctx, s->frame)) < 0) |
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| 95 | return ret; |
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| 96 | |||
| 97 | compr = AV_RL32(buf); |
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| 98 | buf += 4; |
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| 99 | buf_size -= 4; |
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| 100 | psize = avctx->bits_per_coded_sample / 8; |
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| 101 | switch (avctx->codec_tag) { |
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| 102 | case MKTAG('A', 'A', 'S', '4'): |
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| 103 | bytestream2_init(&s->gb, buf - 4, buf_size + 4); |
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| 104 | ff_msrle_decode(avctx, (AVPicture*)s->frame, 8, &s->gb); |
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| 105 | break; |
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| 106 | case MKTAG('A', 'A', 'S', 'C'): |
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| 107 | switch (compr) { |
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| 108 | case 0: |
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| 109 | stride = (avctx->width * psize + psize) & ~psize; |
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| 110 | if (buf_size < stride * avctx->height) |
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| 111 | return AVERROR_INVALIDDATA; |
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| 112 | for (i = avctx->height - 1; i >= 0; i--) { |
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| 113 | memcpy(s->frame->data[0] + i * s->frame->linesize[0], buf, avctx->width * psize); |
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| 114 | buf += stride; |
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| 115 | buf_size -= stride; |
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| 116 | } |
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| 117 | break; |
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| 118 | case 1: |
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| 119 | bytestream2_init(&s->gb, buf, buf_size); |
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| 120 | ff_msrle_decode(avctx, (AVPicture*)s->frame, 8, &s->gb); |
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| 121 | break; |
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| 122 | default: |
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| 123 | av_log(avctx, AV_LOG_ERROR, "Unknown compression type %d\n", compr); |
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| 124 | return AVERROR_INVALIDDATA; |
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| 125 | } |
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| 126 | break; |
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| 127 | default: |
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| 128 | av_log(avctx, AV_LOG_ERROR, "Unknown FourCC: %X\n", avctx->codec_tag); |
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| 129 | return -1; |
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| 130 | } |
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| 131 | |||
| 132 | if (avctx->pix_fmt == AV_PIX_FMT_PAL8) |
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| 133 | memcpy(s->frame->data[1], s->palette, s->palette_size); |
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| 134 | |||
| 135 | *got_frame = 1; |
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| 136 | if ((ret = av_frame_ref(data, s->frame)) < 0) |
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| 137 | return ret; |
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| 138 | |||
| 139 | /* report that the buffer was completely consumed */ |
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| 140 | return buf_size; |
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| 141 | } |
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| 142 | |||
| 143 | static av_cold int aasc_decode_end(AVCodecContext *avctx) |
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| 144 | { |
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| 145 | AascContext *s = avctx->priv_data; |
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| 146 | |||
| 147 | av_frame_free(&s->frame); |
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| 148 | |||
| 149 | return 0; |
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| 150 | } |
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| 151 | |||
| 152 | AVCodec ff_aasc_decoder = { |
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| 153 | .name = "aasc", |
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| 154 | .long_name = NULL_IF_CONFIG_SMALL("Autodesk RLE"), |
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| 155 | .type = AVMEDIA_TYPE_VIDEO, |
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| 156 | .id = AV_CODEC_ID_AASC, |
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| 157 | .priv_data_size = sizeof(AascContext), |
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| 158 | .init = aasc_decode_init, |
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| 159 | .close = aasc_decode_end, |
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| 160 | .decode = aasc_decode_frame, |
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| 161 | .capabilities = CODEC_CAP_DR1, |
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| 162 | }; |