dshow.c File Reference

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

Go to the source code of this file.

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 int	dshow_read_close (AVFormatContext *s)
static char *	dup_wchar_to_utf8 (wchar_t *w)
static int	shall_we_drop (AVFormatContext *s, int index, enum dshowDeviceType devtype)
static void	callback (void *priv_data, int index, uint8_t *buf, int buf_size, int64_t time, enum dshowDeviceType devtype)
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 1062 of file dshow.c.

#define DEC   AV_OPT_FLAG_DECODING_PARAM

Definition at line 1063 of file dshow.c.

Function Documentation

static enum AVPixelFormat dshow_pixfmt ( DWORD  biCompression, WORD  biBitCount  )

static

Definition at line 75 of file dshow.c.

Referenced by dshow_add_device(), and dshow_cycle_formats().

static int dshow_read_close ( AVFormatContext *  s )

static

Definition at line 99 of file dshow.c.

Referenced by dshow_read_header().

static char* dup_wchar_to_utf8 ( wchar_t *  w )

static

Definition at line 173 of file dshow.c.

Referenced by dshow_cycle_pins().

static int shall_we_drop ( AVFormatContext *  s, int  index, enum dshowDeviceType  devtype  )

static

Definition at line 183 of file dshow.c.

Referenced by callback().

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

static

Definition at line 200 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 246 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 325 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 472 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 519 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 633 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 650 of file dshow.c.

Referenced by dshow_read_header().

static enum AVCodecID waveform_codec_id ( enum AVSampleFormat  sample_fmt )

static

Definition at line 713 of file dshow.c.

Referenced by dshow_add_device().

static enum AVSampleFormat sample_fmt_bits_per_sample ( int  bits )

static

Definition at line 723 of file dshow.c.

Referenced by dshow_add_device().

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

static

Definition at line 734 of file dshow.c.

Referenced by dshow_read_header().

static int parse_device_name ( AVFormatContext *  avctx )

static

Definition at line 829 of file dshow.c.

Referenced by dshow_read_header().

static int dshow_read_header ( AVFormatContext *  avctx )

static

Definition at line 866 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 1017 of file dshow.c.

Referenced by dshow_read_packet().

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

static

Definition at line 1032 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, INT_MAX, 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 1064 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,
    .category   = AV_CLASS_CATEGORY_DEVICE_VIDEO_INPUT,
}

Definition at line 1083 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 1091 of file dshow.c.