FFmpeg
rtjpeg.h
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1 /*
2  * RTJpeg decoding functions
3  * copyright (c) 2006 Reimar Doeffinger
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 #ifndef AVCODEC_RTJPEG_H
23 #define AVCODEC_RTJPEG_H
24 
25 #include <stdint.h>
26 
27 #include "libavutil/mem_internal.h"
28 #include "idctdsp.h"
29 
30 #define RTJPEG_FILE_VERSION 0
31 #define RTJPEG_HEADER_SIZE 12
32 
33 typedef struct RTJpegContext {
34  int w, h;
36  uint8_t scan[64];
37  uint32_t lquant[64];
38  uint32_t cquant[64];
39  DECLARE_ALIGNED(16, int16_t, block)[64];
41 
43 
45  const uint32_t *lquant, const uint32_t *cquant);
46 
48  const uint8_t *buf, int buf_size);
49 #endif /* AVCODEC_RTJPEG_H */
mem_internal.h
RTJpegContext::lquant
uint32_t lquant[64]
Definition: rtjpeg.h:37
RTJpegContext::idsp
IDCTDSPContext idsp
Definition: rtjpeg.h:35
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:303
width
#define width
f
#define f(width, name)
Definition: cbs_vp9.c:255
c
Undefined Behavior In the C some operations are like signed integer dereferencing freed accessing outside allocated Undefined Behavior must not occur in a C it is not safe even if the output of undefined operations is unused The unsafety may seem nit picking but Optimizing compilers have in fact optimized code on the assumption that no undefined Behavior occurs Optimizing code based on wrong assumptions can and has in some cases lead to effects beyond the output of computations The signed integer overflow problem in speed critical code Code which is highly optimized and works with signed integers sometimes has the problem that often the output of the computation does not c
Definition: undefined.txt:32
ff_rtjpeg_init
void ff_rtjpeg_init(RTJpegContext *c, AVCodecContext *avctx)
Definition: rtjpeg.c:170
height
#define height
ff_rtjpeg_decode_frame_yuv420
int ff_rtjpeg_decode_frame_yuv420(RTJpegContext *c, AVFrame *f, const uint8_t *buf, int buf_size)
decode one rtjpeg YUV420 frame
Definition: rtjpeg.c:106
DECLARE_ALIGNED
#define DECLARE_ALIGNED(n, t, v)
Definition: mem.h:117
ff_rtjpeg_decode_init
void ff_rtjpeg_decode_init(RTJpegContext *c, int width, int height, const uint32_t *lquant, const uint32_t *cquant)
initialize an RTJpegContext, may be called multiple times
Definition: rtjpeg.c:158
RTJpegContext::block
int16_t block[64]
Definition: rtjpeg.h:39
idctdsp.h
RTJpegContext::cquant
uint32_t cquant[64]
Definition: rtjpeg.h:38
IDCTDSPContext
Definition: idctdsp.h:53
AVCodecContext
main external API structure.
Definition: avcodec.h:501
RTJpegContext::h
int h
Definition: rtjpeg.h:34
RTJpegContext::scan
uint8_t scan[64]
Definition: rtjpeg.h:36
RTJpegContext
Definition: rtjpeg.h:33
RTJpegContext::w
int w
Definition: rtjpeg.h:34