117 lines
3.2 KiB
C++
117 lines
3.2 KiB
C++
// Copyright (c) 2007-2008, Niels Martin Hansen
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are met:
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//
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// * Redistributions of source code must retain the above copyright notice,
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// this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above copyright notice,
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// this list of conditions and the following disclaimer in the documentation
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// and/or other materials provided with the distribution.
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// * Neither the name of the Aegisub Group nor the names of its contributors
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// may be used to endorse or promote products derived from this software
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// without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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// POSSIBILITY OF SUCH DAMAGE.
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//
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// Aegisub Project http://www.aegisub.org/
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//
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// $Id$
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/// @file audio_provider_pcm.h
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/// @see audio_provider_pcm.cpp
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/// @ingroup audio_input
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///
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#ifndef AGI_PRE
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#include <vector>
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#endif
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#ifdef _WIN32
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#include <windows.h>
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#endif
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#include "libmedia/audio.h"
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namespace media {
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/// DOCME
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/// @class PCMAudioProvider
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/// @brief DOCME
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///
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/// DOCME
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class PCMAudioProvider : public AudioProvider {
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private:
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#ifdef _WIN32
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/// DOCME
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HANDLE file_handle;
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/// DOCME
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HANDLE file_mapping;
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/// DOCME
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mutable void *current_mapping;
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/// DOCME
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mutable int64_t mapping_start;
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/// DOCME
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mutable size_t mapping_length;
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#else
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int file_handle;
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mutable void *current_mapping;
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mutable off_t mapping_start;
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mutable size_t mapping_length;
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#endif
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protected:
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PCMAudioProvider(const std::string &filename); // Create base object and open the file mapping
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virtual ~PCMAudioProvider(); // Closes the file mapping
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char * EnsureRangeAccessible(int64_t range_start, int64_t range_length) const; // Ensure that the given range of bytes are accessible in the file mapping and return a pointer to the first byte of the requested range
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/// DOCME
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int64_t file_size; // Size of the opened file
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/// DOCME
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struct IndexPoint {
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/// DOCME
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int64_t start_byte;
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/// DOCME
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int64_t start_sample;
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/// DOCME
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int64_t num_samples;
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};
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/// DOCME
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typedef std::vector<IndexPoint> IndexVector;
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/// DOCME
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IndexVector index_points;
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public:
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virtual void GetAudio(void *buf, int64_t start, int64_t count) const;
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};
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// Construct the right PCM audio provider (if any) for the file
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AudioProvider *CreatePCMAudioProvider(const std::string &filename);
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} // namespace
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