mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-11-21 10:55:51 +02:00
122 lines
3.2 KiB
C
122 lines
3.2 KiB
C
/*
|
|
* V.Flash PTX (.ptx) image decoder
|
|
* Copyright (c) 2007 Ivo van Poorten
|
|
*
|
|
* 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
|
|
*/
|
|
|
|
#include "libavutil/intreadwrite.h"
|
|
#include "libavutil/imgutils.h"
|
|
#include "avcodec.h"
|
|
|
|
typedef struct PTXContext {
|
|
AVFrame picture;
|
|
} PTXContext;
|
|
|
|
static av_cold int ptx_init(AVCodecContext *avctx) {
|
|
PTXContext *s = avctx->priv_data;
|
|
|
|
avcodec_get_frame_defaults(&s->picture);
|
|
avctx->coded_frame= &s->picture;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ptx_decode_frame(AVCodecContext *avctx, void *data, int *data_size,
|
|
AVPacket *avpkt) {
|
|
const uint8_t *buf = avpkt->data;
|
|
PTXContext * const s = avctx->priv_data;
|
|
AVFrame *picture = data;
|
|
AVFrame * const p = &s->picture;
|
|
unsigned int offset, w, h, y, stride, bytes_per_pixel;
|
|
uint8_t *ptr;
|
|
|
|
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) {
|
|
av_log_ask_for_sample(avctx, "Image format is not RGB15.\n");
|
|
return -1;
|
|
}
|
|
|
|
avctx->pix_fmt = PIX_FMT_RGB555;
|
|
|
|
if (offset != 0x2c)
|
|
av_log_ask_for_sample(avctx, "offset != 0x2c\n");
|
|
|
|
buf += offset;
|
|
|
|
if (p->data[0])
|
|
avctx->release_buffer(avctx, p);
|
|
|
|
if (av_image_check_size(w, h, 0, avctx))
|
|
return -1;
|
|
if (w != avctx->width || h != avctx->height)
|
|
avcodec_set_dimensions(avctx, w, h);
|
|
if (avctx->get_buffer(avctx, p) < 0) {
|
|
av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
|
|
return -1;
|
|
}
|
|
|
|
p->pict_type = AV_PICTURE_TYPE_I;
|
|
|
|
ptr = p->data[0];
|
|
stride = p->linesize[0];
|
|
|
|
for (y=0; y<h; y++) {
|
|
#if HAVE_BIGENDIAN
|
|
unsigned int x;
|
|
for (x=0; x<w*bytes_per_pixel; x+=bytes_per_pixel)
|
|
AV_WN16(ptr+x, AV_RL16(buf+x));
|
|
#else
|
|
memcpy(ptr, buf, w*bytes_per_pixel);
|
|
#endif
|
|
ptr += stride;
|
|
buf += w*bytes_per_pixel;
|
|
}
|
|
|
|
*picture = s->picture;
|
|
*data_size = sizeof(AVPicture);
|
|
|
|
return offset + w*h*bytes_per_pixel;
|
|
}
|
|
|
|
static av_cold int ptx_end(AVCodecContext *avctx) {
|
|
PTXContext *s = avctx->priv_data;
|
|
|
|
if(s->picture.data[0])
|
|
avctx->release_buffer(avctx, &s->picture);
|
|
|
|
return 0;
|
|
}
|
|
|
|
AVCodec ff_ptx_decoder = {
|
|
"ptx",
|
|
AVMEDIA_TYPE_VIDEO,
|
|
CODEC_ID_PTX,
|
|
sizeof(PTXContext),
|
|
ptx_init,
|
|
NULL,
|
|
ptx_end,
|
|
ptx_decode_frame,
|
|
CODEC_CAP_DR1,
|
|
NULL,
|
|
.long_name = NULL_IF_CONFIG_SMALL("V.Flash PTX image"),
|
|
};
|