96 lines
2.8 KiB
C
96 lines
2.8 KiB
C
/*
|
|
* V.Flash PTX (.ptx) image decoder
|
|
* Copyright (c) 2007 Ivo van Poorten
|
|
*
|
|
* This file is part of FFmpeg.
|
|
*
|
|
* FFmpeg 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.
|
|
*
|
|
* FFmpeg 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 FFmpeg; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#include "libavutil/common.h"
|
|
#include "libavutil/intreadwrite.h"
|
|
#include "libavutil/imgutils.h"
|
|
#include "avcodec.h"
|
|
#include "internal.h"
|
|
|
|
static int ptx_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
|
|
AVPacket *avpkt) {
|
|
const uint8_t *buf = avpkt->data;
|
|
const uint8_t *buf_end = avpkt->data + avpkt->size;
|
|
AVFrame * const p = data;
|
|
unsigned int offset, w, h, y, stride, bytes_per_pixel;
|
|
int ret;
|
|
uint8_t *ptr;
|
|
|
|
if (buf_end - buf < 14)
|
|
return AVERROR_INVALIDDATA;
|
|
offset = AV_RL16(buf);
|
|
w = AV_RL16(buf+8);
|
|
h = AV_RL16(buf+10);
|
|
bytes_per_pixel = AV_RL16(buf+12) >> 3;
|
|
|
|
if (bytes_per_pixel != 2) {
|
|
avpriv_request_sample(avctx, "Image format not RGB15");
|
|
return AVERROR_PATCHWELCOME;
|
|
}
|
|
|
|
avctx->pix_fmt = AV_PIX_FMT_BGR555LE;
|
|
|
|
if (buf_end - buf < offset)
|
|
return AVERROR_INVALIDDATA;
|
|
if (offset != 0x2c)
|
|
avpriv_request_sample(avctx, "offset != 0x2c");
|
|
|
|
buf += offset;
|
|
|
|
if (buf_end - buf < w * bytes_per_pixel)
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
if ((ret = ff_set_dimensions(avctx, w, h)) < 0)
|
|
return ret;
|
|
|
|
if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
|
|
return ret;
|
|
|
|
p->pict_type = AV_PICTURE_TYPE_I;
|
|
|
|
ptr = p->data[0];
|
|
stride = p->linesize[0];
|
|
|
|
for (y = 0; y < h && buf_end - buf >= w * bytes_per_pixel; y++) {
|
|
memcpy(ptr, buf, w*bytes_per_pixel);
|
|
ptr += stride;
|
|
buf += w*bytes_per_pixel;
|
|
}
|
|
|
|
*got_frame = 1;
|
|
|
|
if (y < h) {
|
|
av_log(avctx, AV_LOG_WARNING, "incomplete packet\n");
|
|
return avpkt->size;
|
|
}
|
|
|
|
return offset + w*h*bytes_per_pixel;
|
|
}
|
|
|
|
AVCodec ff_ptx_decoder = {
|
|
.name = "ptx",
|
|
.long_name = NULL_IF_CONFIG_SMALL("V.Flash PTX image"),
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.id = AV_CODEC_ID_PTX,
|
|
.decode = ptx_decode_frame,
|
|
.capabilities = AV_CODEC_CAP_DR1,
|
|
};
|