0,0 → 1,93 |
/* |
* 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 ((ret = av_image_check_size(w, h, 0, avctx)) < 0) |
return ret; |
if (w != avctx->width || h != avctx->height) |
avcodec_set_dimensions(avctx, w, h); |
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; |
} |
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*got_frame = 1; |
|
if (y < h) { |
av_log(avctx, AV_LOG_WARNING, "incomplete packet\n"); |
return avpkt->size; |
} |
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return offset + w*h*bytes_per_pixel; |
} |
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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 = CODEC_CAP_DR1, |
}; |