/* * Autodesk RLE Decoder * Copyright (C) 2005 the ffmpeg project * * This file is part of Libav. * * Libav is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * Libav is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with Libav; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ /** * @file * Autodesk RLE Video Decoder by Konstantin Shishkov */ #include <stdio.h> #include <stdlib.h> #include <string.h> #include "avcodec.h" #include "dsputil.h" #include "msrledec.h" typedef struct AascContext { AVCodecContext *avctx; AVFrame frame; } AascContext; #define FETCH_NEXT_STREAM_BYTE() \ if (stream_ptr >= buf_size) \ { \ av_log(s->avctx, AV_LOG_ERROR, " AASC: stream ptr just went out of bounds (fetch)\n"); \ break; \ } \ stream_byte = buf[stream_ptr++]; static av_cold int aasc_decode_init(AVCodecContext *avctx) { AascContext *s = avctx->priv_data; s->avctx = avctx; avctx->pix_fmt = PIX_FMT_BGR24; return 0; } static int aasc_decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt) { const uint8_t *buf = avpkt->data; int buf_size = avpkt->size; AascContext *s = avctx->priv_data; int compr, i, stride; s->frame.reference = 1; s->frame.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE; if (avctx->reget_buffer(avctx, &s->frame)) { av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n"); return -1; } compr = AV_RL32(buf); buf += 4; buf_size -= 4; switch(compr){ case 0: stride = (avctx->width * 3 + 3) & ~3; for(i = avctx->height - 1; i >= 0; i--){ memcpy(s->frame.data[0] + i*s->frame.linesize[0], buf, avctx->width*3); buf += stride; } break; case 1: ff_msrle_decode(avctx, (AVPicture*)&s->frame, 8, buf - 4, buf_size + 4); break; default: av_log(avctx, AV_LOG_ERROR, "Unknown compression type %d\n", compr); return -1; } *data_size = sizeof(AVFrame); *(AVFrame*)data = s->frame; /* report that the buffer was completely consumed */ return buf_size; } static av_cold int aasc_decode_end(AVCodecContext *avctx) { AascContext *s = avctx->priv_data; /* release the last frame */ if (s->frame.data[0]) avctx->release_buffer(avctx, &s->frame); return 0; } AVCodec ff_aasc_decoder = { .name = "aasc", .type = AVMEDIA_TYPE_VIDEO, .id = CODEC_ID_AASC, .priv_data_size = sizeof(AascContext), .init = aasc_decode_init, .close = aasc_decode_end, .decode = aasc_decode_frame, .capabilities = CODEC_CAP_DR1, .long_name = NULL_IF_CONFIG_SMALL("Autodesk RLE"), };