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"
23 #include "libavutil/imgutils.h"
26 typedef struct PTXContext {
30 static av_cold int ptx_init(AVCodecContext *avctx) {
31 PTXContext *s = avctx->priv_data;
33 avcodec_get_frame_defaults(&s->picture);
34 avctx->coded_frame= &s->picture;
39 static int ptx_decode_frame(AVCodecContext *avctx, void *data, int *data_size,
41 const uint8_t *buf = avpkt->data;
42 const uint8_t *buf_end = avpkt->data + avpkt->size;
43 PTXContext * const s = avctx->priv_data;
44 AVFrame *picture = data;
45 AVFrame * const p = &s->picture;
46 unsigned int offset, w, h, y, stride, bytes_per_pixel;
49 if (buf_end - buf < 14)
50 return AVERROR_INVALIDDATA;
51 offset = AV_RL16(buf);
54 bytes_per_pixel = AV_RL16(buf+12) >> 3;
56 if (bytes_per_pixel != 2) {
57 av_log_ask_for_sample(avctx, "Image format is not RGB15.\n");
61 avctx->pix_fmt = PIX_FMT_BGR555LE;
63 if (buf_end - buf < offset)
64 return AVERROR_INVALIDDATA;
66 av_log_ask_for_sample(avctx, "offset != 0x2c\n");
71 avctx->release_buffer(avctx, p);
73 if (av_image_check_size(w, h, 0, avctx))
75 if (w != avctx->width || h != avctx->height)
76 avcodec_set_dimensions(avctx, w, h);
77 if (avctx->get_buffer(avctx, p) < 0) {
78 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
82 p->pict_type = AV_PICTURE_TYPE_I;
85 stride = p->linesize[0];
87 for (y = 0; y < h && buf_end - buf >= w * bytes_per_pixel; y++) {
88 memcpy(ptr, buf, w*bytes_per_pixel);
90 buf += w*bytes_per_pixel;
93 *picture = s->picture;
94 *data_size = sizeof(AVPicture);
97 av_log(avctx, AV_LOG_WARNING, "incomplete packet\n");
101 return offset + w*h*bytes_per_pixel;
104 static av_cold int ptx_end(AVCodecContext *avctx) {
105 PTXContext *s = avctx->priv_data;
107 if(s->picture.data[0])
108 avctx->release_buffer(avctx, &s->picture);
113 AVCodec ff_ptx_decoder = {
115 .type = AVMEDIA_TYPE_VIDEO,
117 .priv_data_size = sizeof(PTXContext),
120 .decode = ptx_decode_frame,
121 .capabilities = CODEC_CAP_DR1,
122 .long_name = NULL_IF_CONFIG_SMALL("V.Flash PTX image"),