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https://github.com/FFmpeg/FFmpeg.git
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123 lines
3.3 KiB
C
123 lines
3.3 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 "internal.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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GetByteContext gb;
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AVFrame *frame;
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} AascContext;
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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 = AV_PIX_FMT_BGR24;
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s->frame = av_frame_alloc();
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if (!s->frame)
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return AVERROR(ENOMEM);
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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 *got_frame,
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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, ret;
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if (buf_size < 4)
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return AVERROR_INVALIDDATA;
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if ((ret = ff_reget_buffer(avctx, s->frame)) < 0) {
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av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
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return ret;
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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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if (buf_size < stride * avctx->height)
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return AVERROR_INVALIDDATA;
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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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bytestream2_init(&s->gb, buf, buf_size);
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ff_msrle_decode(avctx, (AVPicture*)s->frame, 8, &s->gb);
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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 AVERROR_INVALIDDATA;
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}
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*got_frame = 1;
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if ((ret = av_frame_ref(data, s->frame)) < 0)
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return ret;
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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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av_frame_free(&s->frame);
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return 0;
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}
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AVCodec ff_aasc_decoder = {
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.name = "aasc",
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.long_name = NULL_IF_CONFIG_SMALL("Autodesk RLE"),
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.type = AVMEDIA_TYPE_VIDEO,
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.id = AV_CODEC_ID_AASC,
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.priv_data_size = sizeof(AascContext),
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.init = aasc_decode_init,
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.close = aasc_decode_end,
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.decode = aasc_decode_frame,
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.capabilities = CODEC_CAP_DR1,
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};
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