mirror of https://github.com/odrling/Aegisub
100 lines
3.4 KiB
C++
100 lines
3.4 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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// -----------------------------------------------------------------------------
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//
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// AEGISUB
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//
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// Website: http://aegisub.cellosoft.com
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// Contact: mailto:jiifurusu@gmail.com
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//
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#pragma once
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///////////
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// Headers
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#include "include/aegisub/audio_provider.h"
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#include <wx/file.h>
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#include <wx/thread.h>
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#include <vector>
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#ifdef _WINDOWS
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#include <windows.h>
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#endif
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/////////////////////////////
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// Audio provider base class
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class PCMAudioProvider : public AudioProvider {
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private:
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#ifdef _WINDOWS
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// File handle and file mapping handle from Win32
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HANDLE file_handle;
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HANDLE file_mapping;
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// Pointer to current area mapped into memory
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void *current_mapping;
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// Byte indices in the file that the current mapping covers
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int64_t mapping_start;
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size_t mapping_length;
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#else
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int file_handle;
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void *current_mapping;
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off_t mapping_start;
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size_t mapping_length;
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#endif
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protected:
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PCMAudioProvider(const wxString &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); // 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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int64_t file_size; // Size of the opened file
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// Hold data for an index point,
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// to support files where audio data are
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// split into multiple blocks.
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// Using int64_t's should be safe on most compilers,
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// wx defines wxFileOffset as int64 when possible
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struct IndexPoint {
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int64_t start_byte;
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int64_t start_sample;
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int64_t num_samples;
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};
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typedef std::vector<IndexPoint> IndexVector;
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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);
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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 wxString &filename);
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