2 * V.Flash PTX (.ptx) image decoder
3 * Copyright (c) 2007 Ivo van Poorten
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 #include "libavutil/intreadwrite.h"
25 typedef struct PTXContext {
29 static av_cold int ptx_init(AVCodecContext *avctx) {
30 PTXContext *s = avctx->priv_data;
32 avcodec_get_frame_defaults(&s->picture);
33 avctx->coded_frame= &s->picture;
38 static int ptx_decode_frame(AVCodecContext *avctx, void *data, int *data_size,
39 const uint8_t *buf, int buf_size) {
40 PTXContext * const s = avctx->priv_data;
41 AVFrame *picture = data;
42 AVFrame * const p = &s->picture;
43 unsigned int offset, w, h, y, stride, bytes_per_pixel;
46 offset = AV_RL16(buf);
49 bytes_per_pixel = AV_RL16(buf+12) >> 3;
51 if (bytes_per_pixel != 2) {
52 av_log(avctx, AV_LOG_ERROR, "image format is not rgb15, please report on ffmpeg-users mailing list\n");
56 avctx->pix_fmt = PIX_FMT_RGB555;
59 av_log(avctx, AV_LOG_WARNING, "offset != 0x2c, untested due to lack of sample files\n");
64 avctx->release_buffer(avctx, p);
66 if (avcodec_check_dimensions(avctx, w, h))
68 if (w != avctx->width || h != avctx->height)
69 avcodec_set_dimensions(avctx, w, h);
70 if (avctx->get_buffer(avctx, p) < 0) {
71 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
75 p->pict_type = FF_I_TYPE;
78 stride = p->linesize[0];
81 #ifdef WORDS_BIGENDIAN
83 for (x=0; x<w*bytes_per_pixel; x+=bytes_per_pixel)
84 AV_WN16(ptr+x, AV_RL16(buf+x));
86 memcpy(ptr, buf, w*bytes_per_pixel);
89 buf += w*bytes_per_pixel;
92 *picture = s->picture;
93 *data_size = sizeof(AVPicture);
95 return offset + w*h*bytes_per_pixel;
98 static av_cold int ptx_end(AVCodecContext *avctx) {
99 PTXContext *s = avctx->priv_data;
101 if(s->picture.data[0])
102 avctx->release_buffer(avctx, &s->picture);
107 AVCodec ptx_decoder = {
118 .long_name = NULL_IF_CONFIG_SMALL("V.Flash PTX image"),