85 lines
3.8 KiB
C++
85 lines
3.8 KiB
C++
#pragma once
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////////////////////////////////////////////////////////////////////////////////
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// The MIT License (MIT)
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//
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// Copyright (c) 2017 Nicholas Frechette & Animation Compression Library contributors
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in all
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// copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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// SOFTWARE.
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////////////////////////////////////////////////////////////////////////////////
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#include "acl/core/impl/compiler_utils.h"
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#include "acl/core/error.h"
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#include "acl/core/memory_utils.h"
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#include <rtm/scalarf.h>
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#include <cstdint>
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#include <limits>
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ACL_IMPL_FILE_PRAGMA_PUSH
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namespace acl
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{
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//////////////////////////////////////////////////////////////////////////
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// Calculate the number of samples present from a duration and sample rate.
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// Conceptually, a clip with 1 sample at any sample rate has a single static
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// pose and as such no definite duration. A clip with 2 samples at 30 FPS
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// has a sample at time 0.0 and another at time 1/30s for a duration of 1/30s.
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// We consider a 0.0 duration as having no samples, an infinite duration as
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// having 1 sample, and otherwise having at least 1 sample.
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//////////////////////////////////////////////////////////////////////////
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inline uint32_t calculate_num_samples(float duration, float sample_rate)
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{
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ACL_ASSERT(duration >= 0.0F, "Invalid duration: %f", duration);
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ACL_ASSERT(sample_rate > 0.0F, "Invalid sample rate: %f", sample_rate);
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if (duration == 0.0F)
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return 0; // No duration whatsoever, we have no samples
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if (duration == std::numeric_limits<float>::infinity())
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return 1; // An infinite duration, we have a single sample (static pose)
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// Otherwise we have at least 1 sample
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return safe_static_cast<uint32_t>(rtm::scalar_floor((duration * sample_rate) + 0.5F)) + 1;
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}
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//////////////////////////////////////////////////////////////////////////
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// Calculate a clip duration from its number of samples and sample rate.
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// Conceptually, a clip with 1 sample at any sample rate has a single static
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// pose and as such no definite duration. A clip with 2 samples at 30 FPS
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// has a sample at time 0.0 and another at time 1/30s for a duration of 1/30s.
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// We consider a 0.0 duration as having no samples, an infinite duration as
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// having 1 sample, and otherwise having at least 1 sample.
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//////////////////////////////////////////////////////////////////////////
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inline float calculate_duration(uint32_t num_samples, float sample_rate)
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{
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ACL_ASSERT(sample_rate > 0.0F, "Invalid sample rate: %f", sample_rate);
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if (num_samples == 0)
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return 0.0F; // No samples means we have no duration
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if (num_samples == 1)
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return std::numeric_limits<float>::infinity(); // A single sample means we have an indefinite duration (static pose)
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// Otherwise we have some duration
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return float(num_samples - 1) / sample_rate;
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}
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}
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ACL_IMPL_FILE_PRAGMA_POP
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