#include "libavutil/parseutils.h"
#include "libavutil/pixdesc.h"
#include "libavutil/opt.h"
#include "libavformat/internal.h"
#include "avdevice.h"
#include "dshow_capture.h"

Data Structures
struct	dshow_ctx

Macros
#define	OFFSET(x) offsetof(struct dshow_ctx, x)

#define	DEC AV_OPT_FLAG_DECODING_PARAM

Functions
static enum AVPixelFormat	dshow_pixfmt (DWORD biCompression, WORD biBitCount)

static enum AVCodecID	dshow_codecid (DWORD biCompression)

static int	dshow_read_close (AVFormatContext *s)

static char *	dup_wchar_to_utf8 (wchar_t *w)

static int	shall_we_drop (AVFormatContext *s)

static void	callback (void priv_data, int index, uint8_t buf, int buf_size, int64_t time)

static int	dshow_cycle_devices (AVFormatContext avctx, ICreateDevEnum devenum, enum dshowDeviceType devtype, IBaseFilter **pfilter)
	Cycle through available devices using the device enumerator devenum, retrieve the device with type specified by devtype and return the pointer to the object found in *pfilter.

static void	dshow_cycle_formats (AVFormatContext avctx, enum dshowDeviceType devtype, IPin pin, int *pformat_set)
	Cycle through available formats using the specified pin, try to set parameters specified through AVOptions and if successful return 1 in *pformat_set.

static int	dshow_set_audio_buffer_size (AVFormatContext avctx, IPin pin)
	Set audio device buffer size in milliseconds (which can directly impact latency, depending on the device).

static int	dshow_cycle_pins (AVFormatContext avctx, enum dshowDeviceType devtype, IBaseFilter device_filter, IPin **ppin)
	Cycle through available pins using the device_filter device, of type devtype, retrieve the first output pin and return the pointer to the object found in *ppin.

static int	dshow_list_device_options (AVFormatContext avctx, ICreateDevEnum devenum, enum dshowDeviceType devtype)
	List options for device with type devtype.

static int	dshow_open_device (AVFormatContext avctx, ICreateDevEnum devenum, enum dshowDeviceType devtype)

static enum AVCodecID	waveform_codec_id (enum AVSampleFormat sample_fmt)

static enum AVSampleFormat	sample_fmt_bits_per_sample (int bits)

static int	dshow_add_device (AVFormatContext *avctx, enum dshowDeviceType devtype)

static int	parse_device_name (AVFormatContext *avctx)

static int	dshow_read_header (AVFormatContext *avctx)

static int	dshow_check_event_queue (IMediaEvent *media_event)
	Checks media events from DirectShow and returns -1 on error or EOF.

static int	dshow_read_packet (AVFormatContext s, AVPacket pkt)

Variables
static const AVOption	options []

static const AVClass	dshow_class

AVInputFormat	ff_dshow_demuxer

Macro Definition Documentation

#define OFFSET ( x ) offsetof(struct dshow_ctx, x)

Definition at line 1070 of file dshow.c.

#define DEC AV_OPT_FLAG_DECODING_PARAM

Definition at line 1071 of file dshow.c.

Function Documentation

static enum AVPixelFormat dshow_pixfmt	(	DWORD	biCompression,
		WORD	biBitCount
	)

static

Definition at line 73 of file dshow.c.

Referenced by dshow_add_device(), and dshow_cycle_formats().

static enum AVCodecID dshow_codecid ( DWORD biCompression )

static

Definition at line 102 of file dshow.c.

Referenced by dshow_add_device(), and dshow_cycle_formats().

static int dshow_read_close ( AVFormatContext * s )

static

Definition at line 115 of file dshow.c.

Referenced by dshow_read_header().

static char* dup_wchar_to_utf8 ( wchar_t * w )

static

Definition at line 189 of file dshow.c.

Referenced by dshow_cycle_pins().

static int shall_we_drop ( AVFormatContext * s )

static

Definition at line 199 of file dshow.c.

Referenced by callback().

static void callback	(	void *	priv_data,
		int	index,
		uint8_t *	buf,
		int	buf_size,
		int64_t	time
	)

static

Definition at line 216 of file dshow.c.

Referenced by av_log_set_callback(), av_opt_query_ranges(), dshow_open_device(), libAVFilter_Setup(), and libspeex_decode_init().

static int dshow_cycle_devices	(	AVFormatContext *	avctx,
		ICreateDevEnum *	devenum,
		enum dshowDeviceType	devtype,
		IBaseFilter **	pfilter
	)

static

Cycle through available devices using the device enumerator devenum, retrieve the device with type specified by devtype and return the pointer to the object found in *pfilter.

If pfilter is NULL, list all device names.

Definition at line 263 of file dshow.c.

Referenced by dshow_list_device_options(), dshow_open_device(), and dshow_read_header().

static void dshow_cycle_formats	(	AVFormatContext *	avctx,
		enum dshowDeviceType	devtype,
		IPin *	pin,
		int *	pformat_set
	)

static

Cycle through available formats using the specified pin, try to set parameters specified through AVOptions and if successful return 1 in *pformat_set.

If pformat_set is NULL, list all pin capabilities.

Definition at line 342 of file dshow.c.

Referenced by dshow_cycle_pins().

static int dshow_set_audio_buffer_size	(	AVFormatContext *	avctx,
		IPin *	pin
	)

static

Set audio device buffer size in milliseconds (which can directly impact latency, depending on the device).

Definition at line 488 of file dshow.c.

Referenced by dshow_cycle_pins().

static int dshow_cycle_pins	(	AVFormatContext *	avctx,
		enum dshowDeviceType	devtype,
		IBaseFilter *	device_filter,
		IPin **	ppin
	)

static

Cycle through available pins using the device_filter device, of type devtype, retrieve the first output pin and return the pointer to the object found in *ppin.

If ppin is NULL, cycle through all pins listing audio/video capabilities.

Definition at line 535 of file dshow.c.

Referenced by dshow_list_device_options(), and dshow_open_device().

static int dshow_list_device_options	(	AVFormatContext *	avctx,
		ICreateDevEnum *	devenum,
		enum dshowDeviceType	devtype
	)

static

List options for device with type devtype.

Parameters

devenum device enumerator used for accessing the device

Definition at line 648 of file dshow.c.

Referenced by dshow_read_header().

static int dshow_open_device	(	AVFormatContext *	avctx,
		ICreateDevEnum *	devenum,
		enum dshowDeviceType	devtype
	)

static

Definition at line 665 of file dshow.c.

Referenced by dshow_read_header().

static enum AVCodecID waveform_codec_id ( enum AVSampleFormat sample_fmt )

static

Definition at line 728 of file dshow.c.

Referenced by dshow_add_device().

static enum AVSampleFormat sample_fmt_bits_per_sample ( int bits )

static

Definition at line 738 of file dshow.c.

Referenced by dshow_add_device().

static int dshow_add_device	(	AVFormatContext *	avctx,
		enum dshowDeviceType	devtype
	)

static

Definition at line 749 of file dshow.c.

Referenced by dshow_read_header().

static int parse_device_name ( AVFormatContext * avctx )

static

Definition at line 838 of file dshow.c.

Referenced by dshow_read_header().

static int dshow_read_header ( AVFormatContext * avctx )

static

Definition at line 875 of file dshow.c.

static int dshow_check_event_queue ( IMediaEvent * media_event )

static

Checks media events from DirectShow and returns -1 on error or EOF.

Also purges all events that might be in the event queue to stop the trigger of event notification.

Definition at line 1025 of file dshow.c.

Referenced by dshow_read_packet().

static int dshow_read_packet	(	AVFormatContext *	s,
		AVPacket *	pkt
	)

static

Definition at line 1040 of file dshow.c.

Variable Documentation

const AVOption options[]

static

Initial value:

= {
    { "video_size", "set video size given a string such as 640x480 or hd720.", OFFSET(requested_width), AV_OPT_TYPE_IMAGE_SIZE, {.str = NULL}, 0, 0, DEC },
    { "pixel_format", "set video pixel format", OFFSET(pixel_format), AV_OPT_TYPE_PIXEL_FMT, {.i64 = AV_PIX_FMT_NONE}, -1, AV_PIX_FMT_NB-1, DEC },
    { "framerate", "set video frame rate", OFFSET(framerate), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
    { "sample_rate", "set audio sample rate", OFFSET(sample_rate), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, DEC },
    { "sample_size", "set audio sample size", OFFSET(sample_size), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 16, DEC },
    { "channels", "set number of audio channels, such as 1 or 2", OFFSET(channels), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, DEC },
    { "list_devices", "list available devices", OFFSET(list_devices), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, DEC, "list_devices" },
    { "true", "", 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, DEC, "list_devices" },
    { "false", "", 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, DEC, "list_devices" },
    { "list_options", "list available options for specified device", OFFSET(list_options), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, DEC, "list_options" },
    { "true", "", 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, DEC, "list_options" },
    { "false", "", 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, DEC, "list_options" },
    { "video_device_number", "set video device number for devices with same name (starts at 0)", OFFSET(video_device_number), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, DEC },
    { "audio_device_number", "set audio device number for devices with same name (starts at 0)", OFFSET(audio_device_number), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, DEC },
    { "audio_buffer_size", "set audio device buffer latency size in milliseconds (default is the device's default)", OFFSET(audio_buffer_size), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, DEC },
    { NULL },
}

Definition at line 1072 of file dshow.c.

const AVClass dshow_class

static

Initial value:

= {
    .class_name = "dshow indev",
    .item_name  = av_default_item_name,
    .option     = options,
    .version    = LIBAVUTIL_VERSION_INT,
}

Definition at line 1091 of file dshow.c.

AVInputFormat ff_dshow_demuxer

Initial value:

= {
    .name           = "dshow",
    .long_name      = NULL_IF_CONFIG_SMALL("DirectShow capture"),
    .priv_data_size = sizeof(struct dshow_ctx),
    .read_header    = dshow_read_header,
    .read_packet    = dshow_read_packet,
    .read_close     = dshow_read_close,
    .flags          = AVFMT_NOFILE,
    .priv_class     = &dshow_class,
}

Definition at line 1098 of file dshow.c.

Data Structures

Macros

Functions

Variables

Macro Definition Documentation

Function Documentation

Variable Documentation