FFmpeg: libavformat/avs2dec.c Source File

FFmpeg

libavformat

avs2dec.c

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1 /*

2 * AVS2 video stream probe.

3 *

4 * Copyright (C) 2018 Huiwen Ren, <hwrenx@126.com>

5 *

6 * This file is part of FFmpeg.

7 *

8 * FFmpeg is free software; you can redistribute it and/or

9 * modify it under the terms of the GNU Lesser General Public

10 * License as published by the Free Software Foundation; either

11 * version 2.1 of the License, or (at your option) any later version.

12 *

13 * FFmpeg is distributed in the hope that it will be useful,

14 * but WITHOUT ANY WARRANTY; without even the implied warranty of

15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

16 * Lesser General Public License for more details.

17 *

18 * You should have received a copy of the GNU Lesser General Public

19 * License along with FFmpeg; if not, write to the Free Software

20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

21 */

22

23 #include "avformat.h"

24 #include "rawdec.h"

25 #include "libavcodec/internal.h"

26 #include "libavutil/intreadwrite.h"

27

28 #define AVS2_ISSQH(x) ((x) == 0xB0)

29 #define AVS2_ISEND(x) ((x) == 0xB1)

30 #define AVS2_ISPIC(x) ((x) == 0xB3 || (x) == 0xB6)

31 #define AVS2_ISUNIT(x) (AVS2_ISSQH(x) || AVS2_ISEND(x) || (x) == 0xB2 || AVS2_ISPIC(x) || (x) == 0xB5 || (x) == 0xB7)

32 #define AVS2_ISPROFILE(x) ((x) == 0x20 || (x) == 0x22 || (x) == 0x30 || (x) == 0x32)

33

34 static int avs2_probe(const AVProbeData *p)

35 {

36 uint32_t code = -1, hds = 0, pic = 0, seq = 0;

37 uint8_t state = 0;

38 const uint8_t *ptr = p->buf, *end = p->buf + p->buf_size, *sqb = 0;

39 if (AV_RB32(p->buf) != 0x1B0){

40 return 0;

41 }

42

43 while (ptr < end) {

44 ptr = avpriv_find_start_code(ptr, end, &code);

45 state = code & 0xFF;

46 if ((code & 0xffffff00) == 0x100) {

47 if (AVS2_ISUNIT(state)) {

48 if (sqb && !hds) {

49 hds = ptr - sqb;

50 }

51 if (AVS2_ISSQH(state)) {

52 if (!AVS2_ISPROFILE(*ptr))

53 return 0;

54 sqb = ptr;

55 seq++;

56 } else if (AVS2_ISPIC(state)) {

57 pic++;

58 } else if (AVS2_ISEND(state)) {

59 break;

60 }

61 }

62 }

63 }

64 if (seq && hds >= 21 && pic){

65 return AVPROBE_SCORE_EXTENSION + 2; // more than cavs

66 }

67

68 return 0;

69 }

70

71 FF_DEF_RAWVIDEO_DEMUXER(avs2, "raw AVS2-P2/IEEE1857.4", avs2_probe, "avs,avs2", AV_CODEC_ID_AVS2)

static int avs2_probe(const AVProbeData *p)

Definition: avs2dec.c:34

AV_CODEC_ID_AVS2

@ AV_CODEC_ID_AVS2

Definition: codec_id.h:244

avpriv_find_start_code

const uint8_t * avpriv_find_start_code(const uint8_t *p, const uint8_t *end, uint32_t *state)

AVProbeData::buf_size

int buf_size

Size of buf except extra allocated bytes.

Definition: avformat.h:450

#define AVS2_ISSQH(x)

Definition: avs2dec.c:28

AVProbeData::buf

unsigned char * buf

Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.

Definition: avformat.h:449

FF_DEF_RAWVIDEO_DEMUXER

#define FF_DEF_RAWVIDEO_DEMUXER(shortname, longname, probe, ext, id)

Definition: rawdec.h:66

This structure contains the data a format has to probe a file.

Definition: avformat.h:447

AVPROBE_SCORE_EXTENSION

#define AVPROBE_SCORE_EXTENSION

score for file extension

Definition: avformat.h:457

static struct @320 state

#define AVS2_ISUNIT(x)

Definition: avs2dec.c:31

uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_WB64 unsigned int_TMPL AV_RB32

Definition: bytestream.h:96

and forward the test the status of outputs and forward it to the corresponding return FFERROR_NOT_READY If the filters stores internally one or a few frame for some it can consider them to be part of the FIFO and delay acknowledging a status change accordingly Example code

Definition: filter_design.txt:178

#define AVS2_ISEND(x)

Definition: avs2dec.c:29

#define AVS2_ISPIC(x)

Definition: avs2dec.c:30

#define AVS2_ISPROFILE(x)

Definition: avs2dec.c:32

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