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 libavcodec/aasc.c 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 AVFrame frame; 38} AascContext; 39 40#define FETCH_NEXT_STREAM_BYTE() \ 41 if (stream_ptr >= buf_size) \ 42 { \ 43 av_log(s->avctx, AV_LOG_ERROR, " AASC: stream ptr just went out of bounds (fetch)\n"); \ 44 break; \ 45 } \ 46 stream_byte = buf[stream_ptr++]; 47 48static av_cold int aasc_decode_init(AVCodecContext *avctx) 49{ 50 AascContext *s = avctx->priv_data; 51 52 s->avctx = avctx; 53 54 avctx->pix_fmt = PIX_FMT_BGR24; 55 s->frame.data[0] = NULL; 56 57 return 0; 58} 59 60static int aasc_decode_frame(AVCodecContext *avctx, 61 void *data, int *data_size, 62 const uint8_t *buf, int buf_size) 63{ 64 AascContext *s = avctx->priv_data; 65 int compr, i, stride; 66 67 s->frame.reference = 1; 68 s->frame.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE; 69 if (avctx->reget_buffer(avctx, &s->frame)) { 70 av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n"); 71 return -1; 72 } 73 74 compr = AV_RL32(buf); 75 buf += 4; 76 buf_size -= 4; 77 switch(compr){ 78 case 0: 79 stride = (avctx->width * 3 + 3) & ~3; 80 for(i = avctx->height - 1; i >= 0; i--){ 81 memcpy(s->frame.data[0] + i*s->frame.linesize[0], buf, avctx->width*3); 82 buf += stride; 83 } 84 break; 85 case 1: 86 ff_msrle_decode(avctx, (AVPicture*)&s->frame, 8, buf - 4, buf_size + 4); 87 break; 88 default: 89 av_log(avctx, AV_LOG_ERROR, "Unknown compression type %d\n", compr); 90 return -1; 91 } 92 93 *data_size = sizeof(AVFrame); 94 *(AVFrame*)data = s->frame; 95 96 /* report that the buffer was completely consumed */ 97 return buf_size; 98} 99 100static av_cold int aasc_decode_end(AVCodecContext *avctx) 101{ 102 AascContext *s = avctx->priv_data; 103 104 /* release the last frame */ 105 if (s->frame.data[0]) 106 avctx->release_buffer(avctx, &s->frame); 107 108 return 0; 109} 110 111AVCodec aasc_decoder = { 112 "aasc", 113 CODEC_TYPE_VIDEO, 114 CODEC_ID_AASC, 115 sizeof(AascContext), 116 aasc_decode_init, 117 NULL, 118 aasc_decode_end, 119 aasc_decode_frame, 120 CODEC_CAP_DR1, 121 .long_name = NULL_IF_CONFIG_SMALL("Autodesk RLE"), 122}; 123