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|
-- GIMP Toolkit (GTK) Binding for Haskell: binding to gstreamer -*-haskell-*-
--
-- Author : Peter Gavin
-- Created: 1-Apr-2007
--
-- Copyright (c) 2007 Peter Gavin
--
-- This library is free software: you can redistribute it and/or
-- modify it under the terms of the GNU Lesser General Public License
-- as published by the Free Software Foundation, either version 3 of
-- the License, or (at your option) any later version.
--
-- This library is distributed in the hope that it will be useful,
-- but WITHOUT ANY WARRANTY; without even the implied warranty of
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
-- Lesser General Public License for more details.
--
-- You should have received a copy of the GNU Lesser General Public
-- License along with this program. If not, see
-- <http://www.gnu.org/licenses/>.
--
-- GStreamer, the C library which this Haskell library depends on, is
-- available under LGPL Version 2. The documentation included with
-- this library is based on the original GStreamer documentation.
--
-- | Maintainer : gtk2hs-devel@lists.sourceforge.net
-- Stability : alpha
-- Portability : portable (depends on GHC)
module Media.Streaming.GStreamer.Core.Query (
Query,
QueryClass,
toQuery,
castToQuery,
gTypeQuery,
) where
{#import Media.Streaming.GStreamer.Core.Types#}
import System.Glib.FFI
{#import System.Glib.GObject#}
import System.Glib.UTFString
{# context lib = "gstreamer" prefix = "gst" #}
queryNone, queryPosition, queryDuration,
queryLatency, queryJitter,
queryRate, querySeeking,
querySegment, queryConvert,
queryFormats :: QueryType
queryNone = 0
queryPosition = 1
queryDuration = 2
queryLatency = 3
queryJitter = 4
queryRate = 5
querySeeking = 6
querySegment = 7
queryConvert = 8
queryFormats = 9
queryTypeGetName :: QueryType
-> IO String
queryTypeGetName queryType =
{# call query_type_get_name #} (fromIntegral queryType) >>=
peekUTFString
queryType :: Query
-> QueryType
queryType query =
unsafePerformIO $ withMiniObject query cQueryType
foreign import ccall unsafe "_hs_gst_query_type"
cQueryType :: Ptr Query
-> IO {# type GstQueryType #}
queryTypeName :: Query
-> IO String
queryTypeName =
queryTypeGetName . queryType
queryTypeToQuark :: QueryType
-> IO Quark
queryTypeToQuark = {# call query_type_to_quark #}
queryTypeRegister :: String
-> String
-> IO QueryType
queryTypeRegister nick description =
withUTFString nick $ \cNick ->
withUTFString description $
{# call query_type_register #} cNick
queryTypeGetByNick :: String
-> IO QueryType
queryTypeGetByNick nick =
withUTFString nick {# call query_type_get_by_nick #}
queryTypeGetDetails :: QueryType
-> IO (Maybe QueryTypeDefinition)
queryTypeGetDetails queryType =
{# call query_type_get_details #} queryType >>=
maybePeek (peek . castPtr)
queryTypeIterateDefinitions :: IO (Iterator QueryTypeDefinition)
queryTypeIterateDefinitions =
{# call query_type_iterate_definitions #} >>= takeIterator
queryNewConvert :: Format
-> Word64
-> Format
-> IO Query
queryNewConvert srcFormat value destFormat =
{# call query_new_convert #} (fromIntegral $ fromFormat srcFormat)
(fromIntegral value)
(fromIntegral $ fromFormat destFormat) >>=
takeMiniObject
|
