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