FFmpeg
ptx.c
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1 /*
2  * V.Flash PTX (.ptx) image decoder
3  * Copyright (c) 2007 Ivo van Poorten
4  *
5  * This file is part of FFmpeg.
6  *
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.
11  *
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.
16  *
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
20  */
21 
22 #include "libavutil/common.h"
23 #include "libavutil/intreadwrite.h"
24 #include "libavutil/imgutils.h"
25 #include "avcodec.h"
26 #include "codec_internal.h"
27 #include "internal.h"
28 
29 static int ptx_decode_frame(AVCodecContext *avctx, AVFrame *p,
30  int *got_frame, AVPacket *avpkt)
31 {
32  const uint8_t *buf = avpkt->data;
33  const uint8_t *buf_end = avpkt->data + avpkt->size;
34  unsigned int offset, w, h, y, stride, bytes_per_pixel;
35  int ret;
36  uint8_t *ptr;
37 
38  if (buf_end - buf < 14)
39  return AVERROR_INVALIDDATA;
40  offset = AV_RL16(buf);
41  w = AV_RL16(buf+8);
42  h = AV_RL16(buf+10);
43  bytes_per_pixel = AV_RL16(buf+12) >> 3;
44 
45  if (bytes_per_pixel != 2) {
46  avpriv_request_sample(avctx, "Image format not RGB15");
47  return AVERROR_PATCHWELCOME;
48  }
49 
51 
52  if (buf_end - buf < offset)
53  return AVERROR_INVALIDDATA;
54  if (offset != 0x2c)
55  avpriv_request_sample(avctx, "offset != 0x2c");
56 
57  buf += offset;
58 
59  if (buf_end - buf < w * bytes_per_pixel)
60  return AVERROR_INVALIDDATA;
61 
62  if ((ret = ff_set_dimensions(avctx, w, h)) < 0)
63  return ret;
64 
65  if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
66  return ret;
67 
69 
70  ptr = p->data[0];
71  stride = p->linesize[0];
72 
73  for (y = 0; y < h && buf_end - buf >= w * bytes_per_pixel; y++) {
74  memcpy(ptr, buf, w*bytes_per_pixel);
75  ptr += stride;
76  buf += w*bytes_per_pixel;
77  }
78 
79  *got_frame = 1;
80 
81  if (y < h) {
82  av_log(avctx, AV_LOG_WARNING, "incomplete packet\n");
83  return avpkt->size;
84  }
85 
86  return offset + w*h*bytes_per_pixel;
87 }
88 
90  .p.name = "ptx",
91  .p.long_name = NULL_IF_CONFIG_SMALL("V.Flash PTX image"),
92  .p.type = AVMEDIA_TYPE_VIDEO,
93  .p.id = AV_CODEC_ID_PTX,
94  .p.capabilities = AV_CODEC_CAP_DR1,
96 };
AV_LOG_WARNING
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:186
ff_ptx_decoder
const FFCodec ff_ptx_decoder
Definition: ptx.c:89
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:325
w
uint8_t w
Definition: llviddspenc.c:38
internal.h
AVPacket::data
uint8_t * data
Definition: packet.h:374
FFCodec
Definition: codec_internal.h:118
AVFrame::data
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:346
FFCodec::p
AVCodec p
The public AVCodec.
Definition: codec_internal.h:122
FF_CODEC_DECODE_CB
#define FF_CODEC_DECODE_CB(func)
Definition: codec_internal.h:260
intreadwrite.h
AV_RL16
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_RL16
Definition: bytestream.h:94
AVERROR_PATCHWELCOME
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:64
AV_PICTURE_TYPE_I
@ AV_PICTURE_TYPE_I
Intra.
Definition: avutil.h:274
AVFrame::pict_type
enum AVPictureType pict_type
Picture type of the frame.
Definition: frame.h:422
ff_get_buffer
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
Definition: decode.c:1462
AV_CODEC_CAP_DR1
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() or get_encode_buffer() for allocating buffers and supports custom allocators.
Definition: codec.h:52
AVPacket::size
int size
Definition: packet.h:375
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:117
codec_internal.h
offset
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf offset
Definition: writing_filters.txt:86
common.h
AVCodec::name
const char * name
Name of the codec implementation.
Definition: codec.h:211
AVCodecContext::pix_fmt
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:608
avcodec.h
stride
#define stride
Definition: h264pred_template.c:537
ret
ret
Definition: filter_design.txt:187
AVCodecContext
main external API structure.
Definition: avcodec.h:398
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
ff_set_dimensions
int ff_set_dimensions(AVCodecContext *s, int width, int height)
Check that the provided frame dimensions are valid and set them on the codec context.
Definition: utils.c:90
avpriv_request_sample
#define avpriv_request_sample(...)
Definition: tableprint_vlc.h:36
AV_PIX_FMT_BGR555LE
@ AV_PIX_FMT_BGR555LE
packed BGR 5:5:5, 16bpp, (msb)1X 5B 5G 5R(lsb), little-endian, X=unused/undefined
Definition: pixfmt.h:113
AVPacket
This structure stores compressed data.
Definition: packet.h:351
imgutils.h
AVFrame::linesize
int linesize[AV_NUM_DATA_POINTERS]
For video, a positive or negative value, which is typically indicating the size in bytes of each pict...
Definition: frame.h:370
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:27
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:61
h
h
Definition: vp9dsp_template.c:2038
AV_CODEC_ID_PTX
@ AV_CODEC_ID_PTX
Definition: codec_id.h:154
ptx_decode_frame
static int ptx_decode_frame(AVCodecContext *avctx, AVFrame *p, int *got_frame, AVPacket *avpkt)
Definition: ptx.c:29