| 1 | /* |
| 2 | * Autodesk RLE Decoder |
| 3 | * Copyright (c) 2005 The FFmpeg Project |
| 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 | * Autodesk RLE Video Decoder by Konstantin Shishkov |
| 25 | */ |
| 26 | |
| 27 | #include <stdio.h> |
| 28 | #include <stdlib.h> |
| 29 | #include <string.h> |
| 30 | |
| 31 | #include "avcodec.h" |
| 32 | #include "internal.h" |
| 33 | #include "msrledec.h" |
| 34 | |
| 35 | typedef struct AascContext { |
| 36 | AVCodecContext *avctx; |
| 37 | GetByteContext gb; |
| 38 | AVFrame *frame; |
| 39 | |
| 40 | uint32_t palette[AVPALETTE_COUNT]; |
| 41 | int palette_size; |
| 42 | } AascContext; |
| 43 | |
| 44 | static av_cold int aasc_decode_init(AVCodecContext *avctx) |
| 45 | { |
| 46 | AascContext *s = avctx->priv_data; |
| 47 | uint8_t *ptr; |
| 48 | int i; |
| 49 | |
| 50 | s->avctx = avctx; |
| 51 | switch (avctx->bits_per_coded_sample) { |
| 52 | case 8: |
| 53 | avctx->pix_fmt = AV_PIX_FMT_PAL8; |
| 54 | |
| 55 | ptr = avctx->extradata; |
| 56 | s->palette_size = FFMIN(avctx->extradata_size, AVPALETTE_SIZE); |
| 57 | for (i = 0; i < s->palette_size / 4; i++) { |
| 58 | s->palette[i] = 0xFFU << 24 | AV_RL32(ptr); |
| 59 | ptr += 4; |
| 60 | } |
| 61 | break; |
| 62 | case 16: |
| 63 | avctx->pix_fmt = AV_PIX_FMT_RGB555LE; |
| 64 | break; |
| 65 | case 24: |
| 66 | avctx->pix_fmt = AV_PIX_FMT_BGR24; |
| 67 | break; |
| 68 | default: |
| 69 | av_log(avctx, AV_LOG_ERROR, "Unsupported bit depth: %d\n", avctx->bits_per_coded_sample); |
| 70 | return -1; |
| 71 | } |
| 72 | |
| 73 | s->frame = av_frame_alloc(); |
| 74 | if (!s->frame) |
| 75 | return AVERROR(ENOMEM); |
| 76 | |
| 77 | return 0; |
| 78 | } |
| 79 | |
| 80 | static int aasc_decode_frame(AVCodecContext *avctx, |
| 81 | void *data, int *got_frame, |
| 82 | AVPacket *avpkt) |
| 83 | { |
| 84 | const uint8_t *buf = avpkt->data; |
| 85 | int buf_size = avpkt->size; |
| 86 | AascContext *s = avctx->priv_data; |
| 87 | int compr, i, stride, psize, ret; |
| 88 | |
| 89 | if (buf_size < 4) { |
| 90 | av_log(avctx, AV_LOG_ERROR, "frame too short\n"); |
| 91 | return AVERROR_INVALIDDATA; |
| 92 | } |
| 93 | |
| 94 | if ((ret = ff_reget_buffer(avctx, s->frame)) < 0) |
| 95 | return ret; |
| 96 | |
| 97 | compr = AV_RL32(buf); |
| 98 | buf += 4; |
| 99 | buf_size -= 4; |
| 100 | psize = avctx->bits_per_coded_sample / 8; |
| 101 | switch (avctx->codec_tag) { |
| 102 | case MKTAG('A', 'A', 'S', '4'): |
| 103 | bytestream2_init(&s->gb, buf - 4, buf_size + 4); |
| 104 | ff_msrle_decode(avctx, (AVPicture*)s->frame, 8, &s->gb); |
| 105 | break; |
| 106 | case MKTAG('A', 'A', 'S', 'C'): |
| 107 | switch (compr) { |
| 108 | case 0: |
| 109 | stride = (avctx->width * psize + psize) & ~psize; |
| 110 | if (buf_size < stride * avctx->height) |
| 111 | return AVERROR_INVALIDDATA; |
| 112 | for (i = avctx->height - 1; i >= 0; i--) { |
| 113 | memcpy(s->frame->data[0] + i * s->frame->linesize[0], buf, avctx->width * psize); |
| 114 | buf += stride; |
| 115 | buf_size -= stride; |
| 116 | } |
| 117 | break; |
| 118 | case 1: |
| 119 | bytestream2_init(&s->gb, buf, buf_size); |
| 120 | ff_msrle_decode(avctx, (AVPicture*)s->frame, 8, &s->gb); |
| 121 | break; |
| 122 | default: |
| 123 | av_log(avctx, AV_LOG_ERROR, "Unknown compression type %d\n", compr); |
| 124 | return AVERROR_INVALIDDATA; |
| 125 | } |
| 126 | break; |
| 127 | default: |
| 128 | av_log(avctx, AV_LOG_ERROR, "Unknown FourCC: %X\n", avctx->codec_tag); |
| 129 | return -1; |
| 130 | } |
| 131 | |
| 132 | if (avctx->pix_fmt == AV_PIX_FMT_PAL8) |
| 133 | memcpy(s->frame->data[1], s->palette, s->palette_size); |
| 134 | |
| 135 | *got_frame = 1; |
| 136 | if ((ret = av_frame_ref(data, s->frame)) < 0) |
| 137 | return ret; |
| 138 | |
| 139 | /* report that the buffer was completely consumed */ |
| 140 | return buf_size; |
| 141 | } |
| 142 | |
| 143 | static av_cold int aasc_decode_end(AVCodecContext *avctx) |
| 144 | { |
| 145 | AascContext *s = avctx->priv_data; |
| 146 | |
| 147 | av_frame_free(&s->frame); |
| 148 | |
| 149 | return 0; |
| 150 | } |
| 151 | |
| 152 | AVCodec ff_aasc_decoder = { |
| 153 | .name = "aasc", |
| 154 | .long_name = NULL_IF_CONFIG_SMALL("Autodesk RLE"), |
| 155 | .type = AVMEDIA_TYPE_VIDEO, |
| 156 | .id = AV_CODEC_ID_AASC, |
| 157 | .priv_data_size = sizeof(AascContext), |
| 158 | .init = aasc_decode_init, |
| 159 | .close = aasc_decode_end, |
| 160 | .decode = aasc_decode_frame, |
| 161 | .capabilities = CODEC_CAP_DR1, |
| 162 | }; |