Aegisub/aegisub/libmedia/audio/dummy_audio.cpp

81 lines
2.5 KiB
C++

// Copyright (c) 2005-2006, Rodrigo Braz Monteiro, Fredrik Mellbin
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// * Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
// * Neither the name of the Aegisub Group nor the names of its contributors
// may be used to endorse or promote products derived from this software
// without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
//
// Aegisub Project http://www.aegisub.org/
//
// $Id$
/// @file audio_provider_dummy.cpp
/// @brief Dummy (silence or noise) audio provider
/// @ingroup audio_input
///
#include "config.h"
#include "dummy_audio.h"
namespace media {
/// @brief Constructor
/// @param dur_ms
/// @param _noise
///
DummyAudioProvider::DummyAudioProvider(unsigned long dur_ms, bool _noise) {
noise = _noise;
channels = 1;
sample_rate = 44100;
bytes_per_sample = 2;
num_samples = (int64_t)dur_ms * sample_rate / 1000;
}
/// @brief Destructor
///
DummyAudioProvider::~DummyAudioProvider() {
}
/// @brief Get audio
/// @param buf
/// @param start
/// @param count
///
void DummyAudioProvider::GetAudio(void *buf, int64_t start, int64_t count) const {
short *workbuf = (short*)buf;
if (noise) {
while (--count > 0)
*workbuf++ = (rand() - RAND_MAX/2) * 10000 / RAND_MAX;
}
else {
while (--count > 0)
*workbuf++ = 0;
}
}
} // namespace