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"
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 = AV_PIX_FMT_BGR555LE;
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++) {
89 memcpy(ptr, buf, w*bytes_per_pixel);
91 buf += w*bytes_per_pixel;
94 *picture = s->picture;
95 *data_size = sizeof(AVPicture);
98 av_log(avctx, AV_LOG_WARNING, "incomplete packet\n");
102 return offset + w*h*bytes_per_pixel;
105 static av_cold int ptx_end(AVCodecContext *avctx) {
106 PTXContext *s = avctx->priv_data;
108 if(s->picture.data[0])
109 avctx->release_buffer(avctx, &s->picture);
114 AVCodec ff_ptx_decoder = {
116 .type = AVMEDIA_TYPE_VIDEO,
117 .id = AV_CODEC_ID_PTX,
118 .priv_data_size = sizeof(PTXContext),
121 .decode = ptx_decode_frame,
122 .capabilities = CODEC_CAP_DR1,
123 .long_name = NULL_IF_CONFIG_SMALL("V.Flash PTX image"),