dshow.c File Reference

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

Go to the source code of this file.

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, enum dshowSourceFilterType sourcetype, IBaseFilter **pfilter, char **device_unique_name)
	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. More...
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. More...
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). More...
void	dshow_show_filter_properties (IBaseFilter *device_filter, AVFormatContext *avctx)
	Pops up a user dialog allowing them to adjust properties for the given filter, if possible. More...
static int	dshow_cycle_pins (AVFormatContext *avctx, enum dshowDeviceType devtype, enum dshowSourceFilterType sourcetype, 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. More...
static int	dshow_list_device_options (AVFormatContext *avctx, ICreateDevEnum *devenum, enum dshowDeviceType devtype, enum dshowSourceFilterType sourcetype)
	List options for device with type devtype, source filter type sourcetype. More...
static int	dshow_open_device (AVFormatContext *avctx, ICreateDevEnum *devenum, enum dshowDeviceType devtype, enum dshowSourceFilterType sourcetype)
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. More...
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

OFFSET

#define OFFSET

(

x

)

offsetof(struct dshow_ctx, x)

Definition at line 1292 of file dshow.c.

DEC

#define DEC   AV_OPT_FLAG_DECODING_PARAM

Definition at line 1293 of file dshow.c.

Function Documentation

dshow_pixfmt()

static enum AVPixelFormat dshow_pixfmt ( DWORD  biCompression, WORD  biBitCount  )

static

Definition at line 34 of file dshow.c.

Referenced by dshow_add_device(), and dshow_cycle_formats().

dshow_read_close()

static int dshow_read_close ( AVFormatContext *  s )

static

Definition at line 58 of file dshow.c.

Referenced by dshow_read_header().

dup_wchar_to_utf8()

static char* dup_wchar_to_utf8 ( wchar_t *  w )

static

Definition at line 132 of file dshow.c.

Referenced by dshow_cycle_pins().

shall_we_drop()

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

static

Definition at line 142 of file dshow.c.

Referenced by callback().

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 161 of file dshow.c.

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

dshow_cycle_devices()

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

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 207 of file dshow.c.

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

dshow_cycle_formats()

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 322 of file dshow.c.

Referenced by dshow_cycle_pins().

dshow_set_audio_buffer_size()

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 469 of file dshow.c.

Referenced by dshow_cycle_pins().

dshow_show_filter_properties()

void dshow_show_filter_properties	(	IBaseFilter *	device_filter,
		AVFormatContext *	avctx
	)

Pops up a user dialog allowing them to adjust properties for the given filter, if possible.

Definition at line 513 of file dshow.c.

Referenced by dshow_cycle_pins(), and dshow_try_setup_crossbar_options().

dshow_cycle_pins()

static int dshow_cycle_pins ( AVFormatContext *  avctx, enum dshowDeviceType  devtype, enum dshowSourceFilterType  sourcetype, 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 563 of file dshow.c.

Referenced by dshow_list_device_options(), and dshow_open_device().

dshow_list_device_options()

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

static

List options for device with type devtype, source filter type sourcetype.

Parameters

devenum

device enumerator used for accessing the device

Definition at line 708 of file dshow.c.

Referenced by dshow_read_header().

dshow_open_device()

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

static

Definition at line 726 of file dshow.c.

Referenced by dshow_read_header().

waveform_codec_id()

static enum AVCodecID waveform_codec_id ( enum AVSampleFormat  sample_fmt )

static

Definition at line 915 of file dshow.c.

Referenced by dshow_add_device().

sample_fmt_bits_per_sample()

static enum AVSampleFormat sample_fmt_bits_per_sample ( int  bits )

static

Definition at line 925 of file dshow.c.

Referenced by dshow_add_device().

dshow_add_device()

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

static

Definition at line 936 of file dshow.c.

Referenced by dshow_read_header().

parse_device_name()

static int parse_device_name ( AVFormatContext *  avctx )

static

Definition at line 1042 of file dshow.c.

Referenced by dshow_read_header().

dshow_read_header()

static int dshow_read_header ( AVFormatContext *  avctx )

static

Definition at line 1079 of file dshow.c.

dshow_check_event_queue()

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 1247 of file dshow.c.

Referenced by dshow_read_packet().

dshow_read_packet()

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

static

Definition at line 1262 of file dshow.c.

Variable Documentation

options

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 },
    { "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 },
    { "list_devices", "list available devices",                      OFFSET(list_devices), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, DEC },
    { "list_options", "list available options for specified device", OFFSET(list_options), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, DEC },
    { "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 },
    { "video_pin_name", "select video capture pin by name", OFFSET(video_pin_name),AV_OPT_TYPE_STRING, {.str = NULL},  0, 0, AV_OPT_FLAG_ENCODING_PARAM },
    { "audio_pin_name", "select audio capture pin by name", OFFSET(audio_pin_name),AV_OPT_TYPE_STRING, {.str = NULL},  0, 0, AV_OPT_FLAG_ENCODING_PARAM },
    { "crossbar_video_input_pin_number", "set video input pin number for crossbar device", OFFSET(crossbar_video_input_pin_number), AV_OPT_TYPE_INT, {.i64 = -1}, -1, INT_MAX, DEC },
    { "crossbar_audio_input_pin_number", "set audio input pin number for crossbar device", OFFSET(crossbar_audio_input_pin_number), AV_OPT_TYPE_INT, {.i64 = -1}, -1, INT_MAX, DEC },
    { "show_video_device_dialog",              "display property dialog for video capture device",                            OFFSET(show_video_device_dialog),              AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, DEC },
    { "show_audio_device_dialog",              "display property dialog for audio capture device",                            OFFSET(show_audio_device_dialog),              AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, DEC },
    { "show_video_crossbar_connection_dialog", "display property dialog for crossbar connecting pins filter on video device", OFFSET(show_video_crossbar_connection_dialog), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, DEC },
    { "show_audio_crossbar_connection_dialog", "display property dialog for crossbar connecting pins filter on audio device", OFFSET(show_audio_crossbar_connection_dialog), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, DEC },
    { "show_analog_tv_tuner_dialog",           "display property dialog for analog tuner filter",                             OFFSET(show_analog_tv_tuner_dialog),           AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, DEC },
    { "show_analog_tv_tuner_audio_dialog",     "display property dialog for analog tuner audio filter",                       OFFSET(show_analog_tv_tuner_audio_dialog),     AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, DEC },
    { "audio_device_load", "load audio capture filter device (and properties) from file", OFFSET(audio_filter_load_file), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
    { "audio_device_save", "save audio capture filter device (and properties) to file", OFFSET(audio_filter_save_file), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
    { "video_device_load", "load video capture filter device (and properties) from file", OFFSET(video_filter_load_file), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
    { "video_device_save", "save video capture filter device (and properties) to file", OFFSET(video_filter_save_file), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
    { NULL },
}

Definition at line 1294 of file dshow.c.

dshow_class

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 1323 of file dshow.c.

ff_dshow_demuxer

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 1331 of file dshow.c.