forked from mia/Aegisub
93 lines
3.6 KiB
C++
93 lines
3.6 KiB
C++
// Copyright (c) 2005-2006, Rodrigo Braz Monteiro, Fredrik Mellbin
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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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/// @file audio_provider_dummy.cpp
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/// @brief Dummy (silence or noise) audio provider
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/// @ingroup audio_input
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///
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#include "include/aegisub/audio_provider.h"
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#include <libaegisub/fs.h>
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#include <libaegisub/make_unique.h>
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#include <boost/algorithm/string/predicate.hpp>
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/*
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* scheme ::= "dummy-audio" ":" signal-specifier "?" signal-parameters
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* signal-specifier ::= "silence" | "noise" | "sine" "/" frequency
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* frequency ::= integer
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* signal-parameters ::= signal-parameter [ "&" signal-parameters ]
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* signal-parameter ::= signal-parameter-name "=" integer
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* signal-parameter-name ::= "sr" | "bd" | "ch" | "ln"
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*
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* Signal types:
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* "silence", a silent signal is generated.
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* "noise", a white noise signal is generated.
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* "sine", a sine wave is generated at the specified frequency.
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*
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* Signal parameters:
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* "sr", sample rate to generate signal at.
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* "bd", bit depth to generate signal at (usually 16).
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* "ch", number of channels to generate, usually 1 or 2. The same signal is generated
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* in every channel even if one would be LFE.
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* "ln", length of signal in samples. ln/sr gives signal length in seconds.
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*/
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namespace {
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class DummyAudioProvider final : public AudioProvider {
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bool noise;
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void FillBuffer(void *buf, int64_t start, int64_t count) const override {
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if (noise) {
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auto workbuf = static_cast<uint16_t *>(buf);
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while (count-- > 0)
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*workbuf++ = (rand() - RAND_MAX/2) * 10000 / RAND_MAX;
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}
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else {
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memset(buf, 0, count * bytes_per_sample);
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}
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}
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public:
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DummyAudioProvider(agi::fs::path const& uri) {
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noise = boost::contains(uri.string(), ":noise?");
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channels = 1;
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sample_rate = 44100;
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bytes_per_sample = 2;
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float_samples = false;
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decoded_samples = num_samples = (int64_t)5*30*60*1000 * sample_rate / 1000;
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}
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};
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}
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std::unique_ptr<AudioProvider> CreateDummyAudioProvider(agi::fs::path const& file, agi::BackgroundRunner *) {
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if (!boost::starts_with(file.string(), "dummy-audio:"))
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return {};
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return agi::make_unique<DummyAudioProvider>(file);
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}
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