aac5773f
 hucm
功能基本完成，接口待打磨
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/*
* 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,
};
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