1/* 2 * Autodesk RLE Decoder 3 * Copyright (C) 2005 the ffmpeg project 4 * 5 * This file is part of Libav. 6 * 7 * Libav 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 * Libav 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 Libav; 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 "dsputil.h" 33#include "msrledec.h" 34 35typedef struct AascContext { 36 AVCodecContext *avctx; 37 GetByteContext gb; 38 AVFrame frame; 39} AascContext; 40 41static av_cold int aasc_decode_init(AVCodecContext *avctx) 42{ 43 AascContext *s = avctx->priv_data; 44 45 s->avctx = avctx; 46 47 avctx->pix_fmt = PIX_FMT_BGR24; 48 49 return 0; 50} 51 52static int aasc_decode_frame(AVCodecContext *avctx, 53 void *data, int *data_size, 54 AVPacket *avpkt) 55{ 56 const uint8_t *buf = avpkt->data; 57 int buf_size = avpkt->size; 58 AascContext *s = avctx->priv_data; 59 int compr, i, stride; 60 61 s->frame.reference = 1; 62 s->frame.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE; 63 if (avctx->reget_buffer(avctx, &s->frame)) { 64 av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n"); 65 return -1; 66 } 67 68 compr = AV_RL32(buf); 69 buf += 4; 70 buf_size -= 4; 71 switch(compr){ 72 case 0: 73 stride = (avctx->width * 3 + 3) & ~3; 74 for(i = avctx->height - 1; i >= 0; i--){ 75 memcpy(s->frame.data[0] + i*s->frame.linesize[0], buf, avctx->width*3); 76 buf += stride; 77 } 78 break; 79 case 1: 80 bytestream2_init(&s->gb, buf - 4, buf_size + 4); 81 ff_msrle_decode(avctx, (AVPicture*)&s->frame, 8, &s->gb); 82 break; 83 default: 84 av_log(avctx, AV_LOG_ERROR, "Unknown compression type %d\n", compr); 85 return -1; 86 } 87 88 *data_size = sizeof(AVFrame); 89 *(AVFrame*)data = s->frame; 90 91 /* report that the buffer was completely consumed */ 92 return buf_size; 93} 94 95static av_cold int aasc_decode_end(AVCodecContext *avctx) 96{ 97 AascContext *s = avctx->priv_data; 98 99 /* release the last frame */ 100 if (s->frame.data[0]) 101 avctx->release_buffer(avctx, &s->frame); 102 103 return 0; 104} 105 106AVCodec ff_aasc_decoder = { 107 .name = "aasc", 108 .type = AVMEDIA_TYPE_VIDEO, 109 .id = CODEC_ID_AASC, 110 .priv_data_size = sizeof(AascContext), 111 .init = aasc_decode_init, 112 .close = aasc_decode_end, 113 .decode = aasc_decode_frame, 114 .capabilities = CODEC_CAP_DR1, 115 .long_name = NULL_IF_CONFIG_SMALL("Autodesk RLE"), 116}; 117