FFmpeg: libavdevice/utils.c Source File

25 int ff_alloc_input_device_context(AVFormatContext **avctx, const AVInputFormat *iformat, const char *format)

26{

27 AVFormatContext *s;

28 int ret = 0;

29

30 *avctx = NULL;

31 if (!iformat && !format)

32 return AVERROR(EINVAL);

33 if (!(s = avformat_alloc_context()))

34 return AVERROR(ENOMEM);

35

36 if (!iformat)

37 iformat = av_find_input_format(format);

38 if (!iformat || !iformat->priv_class || !AV_IS_INPUT_DEVICE(iformat->priv_class->category)) {

39 ret = AVERROR(EINVAL);

40 goto error;

41 }

42 s->iformat = iformat;

43 if (ffifmt(s->iformat)->priv_data_size > 0) {

44 s->priv_data = av_mallocz(ffifmt(s->iformat)->priv_data_size);

45 if (!s->priv_data) {

46 ret = AVERROR(ENOMEM);

47 goto error;

48 }

49 if (s->iformat->priv_class) {

50 *(const AVClass**)s->priv_data= s->iformat->priv_class;

51 av_opt_set_defaults(s->priv_data);

52 }

53 } else

54 s->priv_data = NULL;

55

56 *avctx = s;

57 return 0;

58 error:

59 avformat_free_context(s);

60 return ret;

61}

format

static const char *const format[]

Definition af_aiir.c:445

avformat.h

Main libavformat public API header.

s

#define s(width, name)

Definition cbs_vp9.c:198

NULL

#define NULL

Definition coverity.c:32

demux.h

ffifmt

static const FFInputFormat * ffifmt(const AVInputFormat *fmt)

Definition demux.h:186

iformat

static const AVInputFormat * iformat

Definition ffprobe.c:345

avformat_alloc_context

AVFormatContext * avformat_alloc_context(void)

Allocate an AVFormatContext.

Definition options.c:165

avformat_free_context

void avformat_free_context(AVFormatContext *s)

Free an AVFormatContext and all its streams.

Definition avformat.c:150

av_find_input_format

const AVInputFormat * av_find_input_format(const char *short_name)

Find AVInputFormat based on the short name of the input format.

Definition format.c:146

AVERROR

#define AVERROR(e)

Definition error.h:45

av_opt_set_defaults

void av_opt_set_defaults(void *s)

Set the values of all AVOption fields to their default values.

Definition opt.c:1756

internal.h

ff_alloc_input_device_context

int ff_alloc_input_device_context(AVFormatContext **avctx, const AVInputFormat *iformat, const char *format)

Definition utils.c:25

AV_IS_INPUT_DEVICE

#define AV_IS_INPUT_DEVICE(category)

Definition log.h:59

mem.h

Memory handling functions.

opt.h

AVOptions.

AVClass

Describe the class of an AVClass context structure.

Definition log.h:76

AVFormatContext

Format I/O context.

Definition avformat.h:1333

AVInputFormat

Definition avformat.h:565

FFInputFormat::priv_data_size

int priv_data_size

Size of private data so that it can be allocated in the wrapper.

Definition demux.h:80

av_mallocz

#define av_mallocz(s)

Definition tableprint_vlc.h:31

error

static void error(const char *err)

Definition target_bsf_fuzzer.c:32