2 * V.Flash PTX (.ptx) image decoder
3 * Copyright (c) 2007 Ivo van Poorten
5 * This file is part of Libav.
7 * Libav 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 * Libav 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 Libav; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 #include "libavutil/common.h"
23 #include "libavutil/intreadwrite.h"
24 #include "libavutil/imgutils.h"
27 typedef struct PTXContext {
31 static av_cold int ptx_init(AVCodecContext *avctx) {
32 PTXContext *s = avctx->priv_data;
34 avcodec_get_frame_defaults(&s->picture);
35 avctx->coded_frame= &s->picture;
40 static int ptx_decode_frame(AVCodecContext *avctx, void *data, int *data_size,
42 const uint8_t *buf = avpkt->data;
43 const uint8_t *buf_end = avpkt->data + avpkt->size;
44 PTXContext * const s = avctx->priv_data;
45 AVFrame *picture = data;
46 AVFrame * const p = &s->picture;
47 unsigned int offset, w, h, y, stride, bytes_per_pixel;
50 if (buf_end - buf < 14)
51 return AVERROR_INVALIDDATA;
52 offset = AV_RL16(buf);
55 bytes_per_pixel = AV_RL16(buf+12) >> 3;
57 if (bytes_per_pixel != 2) {
58 av_log_ask_for_sample(avctx, "Image format is not RGB15.\n");
62 avctx->pix_fmt = PIX_FMT_RGB555;
64 if (buf_end - buf < offset)
65 return AVERROR_INVALIDDATA;
67 av_log_ask_for_sample(avctx, "offset != 0x2c\n");
72 avctx->release_buffer(avctx, p);
74 if (av_image_check_size(w, h, 0, avctx))
76 if (w != avctx->width || h != avctx->height)
77 avcodec_set_dimensions(avctx, w, h);
78 if (avctx->get_buffer(avctx, p) < 0) {
79 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
83 p->pict_type = AV_PICTURE_TYPE_I;
86 stride = p->linesize[0];
88 for (y = 0; y < h && buf_end - buf >= w * bytes_per_pixel; y++) {
91 for (x=0; x<w*bytes_per_pixel; x+=bytes_per_pixel)
92 AV_WN16(ptr+x, AV_RL16(buf+x));
94 memcpy(ptr, buf, w*bytes_per_pixel);
97 buf += w*bytes_per_pixel;
100 *picture = s->picture;
101 *data_size = sizeof(AVPicture);
104 av_log(avctx, AV_LOG_WARNING, "incomplete packet\n");
108 return offset + w*h*bytes_per_pixel;
111 static av_cold int ptx_end(AVCodecContext *avctx) {
112 PTXContext *s = avctx->priv_data;
114 if(s->picture.data[0])
115 avctx->release_buffer(avctx, &s->picture);
120 AVCodec ff_ptx_decoder = {
122 .type = AVMEDIA_TYPE_VIDEO,
123 .id = AV_CODEC_ID_PTX,
124 .priv_data_size = sizeof(PTXContext),
127 .decode = ptx_decode_frame,
128 .capabilities = CODEC_CAP_DR1,
129 .long_name = NULL_IF_CONFIG_SMALL("V.Flash PTX image"),