mirror of
https://git.ffmpeg.org/ffmpeg.git
synced 2024-12-30 03:12:08 +00:00
123 lines
3.3 KiB
C
123 lines
3.3 KiB
C
/*
|
|
* 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"),
|
|
};
|