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/common.h"
23 #include "libavutil/intreadwrite.h"
24 #include "libavutil/imgutils.h"
28 typedef struct PTXContext {
32 static av_cold int ptx_init(AVCodecContext *avctx) {
33 PTXContext *s = avctx->priv_data;
35 avcodec_get_frame_defaults(&s->picture);
36 avctx->coded_frame= &s->picture;
41 static int ptx_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
43 const uint8_t *buf = avpkt->data;
44 const uint8_t *buf_end = avpkt->data + avpkt->size;
45 PTXContext * const s = avctx->priv_data;
46 AVFrame *picture = data;
47 AVFrame * const p = &s->picture;
48 unsigned int offset, w, h, y, stride, bytes_per_pixel;
51 if (buf_end - buf < 14)
52 return AVERROR_INVALIDDATA;
53 offset = AV_RL16(buf);
56 bytes_per_pixel = AV_RL16(buf+12) >> 3;
58 if (bytes_per_pixel != 2) {
59 av_log_ask_for_sample(avctx, "Image format is not RGB15.\n");
60 return AVERROR_PATCHWELCOME;
63 avctx->pix_fmt = AV_PIX_FMT_BGR555LE;
65 if (buf_end - buf < offset)
66 return AVERROR_INVALIDDATA;
68 av_log_ask_for_sample(avctx, "offset != 0x2c\n");
73 avctx->release_buffer(avctx, p);
75 if (av_image_check_size(w, h, 0, avctx))
77 if (w != avctx->width || h != avctx->height)
78 avcodec_set_dimensions(avctx, w, h);
79 if (ff_get_buffer(avctx, p) < 0) {
80 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
84 p->pict_type = AV_PICTURE_TYPE_I;
87 stride = p->linesize[0];
89 for (y = 0; y < h && buf_end - buf >= w * bytes_per_pixel; y++) {
90 memcpy(ptr, buf, w*bytes_per_pixel);
92 buf += w*bytes_per_pixel;
95 *picture = s->picture;
99 av_log(avctx, AV_LOG_WARNING, "incomplete packet\n");
103 return offset + w*h*bytes_per_pixel;
106 static av_cold int ptx_end(AVCodecContext *avctx) {
107 PTXContext *s = avctx->priv_data;
109 if(s->picture.data[0])
110 avctx->release_buffer(avctx, &s->picture);
115 AVCodec ff_ptx_decoder = {
117 .type = AVMEDIA_TYPE_VIDEO,
118 .id = AV_CODEC_ID_PTX,
119 .priv_data_size = sizeof(PTXContext),
122 .decode = ptx_decode_frame,
123 .capabilities = CODEC_CAP_DR1,
124 .long_name = NULL_IF_CONFIG_SMALL("V.Flash PTX image"),