FFmpeg: libavcodec/rtjpeg.h Source File

FFmpeg

libavcodec

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;

35 IDCTDSPContext idsp;

36 uint8_t scan[64];

37 uint32_t lquant[64];

38 uint32_t cquant[64];

39 DECLARE_ALIGNED(16, int16_t, block)[64];

40 } RTJpegContext;

41

42 void ff_rtjpeg_init(RTJpegContext *c, AVCodecContext *avctx);

43

44 void ff_rtjpeg_decode_init(RTJpegContext *c, int width, int height,

45 const uint32_t *lquant, const uint32_t *cquant);

46

47 int ff_rtjpeg_decode_frame_yuv420(RTJpegContext *c, AVFrame *f,

48 const uint8_t *buf, int buf_size);

49 #endif /* AVCODEC_RTJPEG_H */

RTJpegContext::lquant

uint32_t lquant[64]

Definition: rtjpeg.h:37

RTJpegContext::idsp

IDCTDSPContext idsp

Definition: rtjpeg.h:35

This structure describes decoded (raw) audio or video data.

Definition: frame.h:330

#define width

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

f

f

Definition: af_crystalizer.c:122

void ff_rtjpeg_init(RTJpegContext *c, AVCodecContext *avctx)

Definition: rtjpeg.c:170

DECLARE_ALIGNED

#define DECLARE_ALIGNED(n, t, v)

Definition: mem_internal.h:87

#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

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

RTJpegContext::cquant

uint32_t cquant[64]

Definition: rtjpeg.h:38

Definition: idctdsp.h:44

main external API structure.

Definition: avcodec.h:426

RTJpegContext::h

int h

Definition: rtjpeg.h:34

RTJpegContext::scan

uint8_t scan[64]

Definition: rtjpeg.h:36

Definition: rtjpeg.h:33

RTJpegContext::w

int w

Definition: rtjpeg.h:34

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