52 lines
1.5 KiB
C
52 lines
1.5 KiB
C
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// Copyright (c) 2011 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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// Contains limit definition constants for the media subsystem.
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#ifndef MEDIA_BASE_LIMITS_H_
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#define MEDIA_BASE_LIMITS_H_
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#include "base/basictypes.h"
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namespace media {
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namespace limits {
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enum {
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// Maximum possible dimension (width or height) for any video.
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kMaxDimension = (1 << 15) - 1, // 32767
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// Maximum possible canvas size (width multiplied by height) for any video.
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kMaxCanvas = (1 << (14 * 2)), // 16384 x 16384
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// Total number of video frames which are populating in the pipeline.
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kMaxVideoFrames = 4,
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// The following limits are used by AudioParameters::IsValid().
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//
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// A few notes on sample rates of common formats:
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// - AAC files are limited to 96 kHz.
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// - MP3 files are limited to 48 kHz.
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// - Vorbis used to be limited to 96 KHz, but no longer has that
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// restriction.
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// - Most PC audio hardware is limited to 192 KHz.
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kMaxSampleRate = 192000,
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kMinSampleRate = 3000,
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kMaxChannels = 32,
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kMaxBytesPerSample = 4,
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kMaxBitsPerSample = kMaxBytesPerSample * 8,
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kMaxSamplesPerPacket = kMaxSampleRate,
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kMaxPacketSizeInBytes =
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kMaxBytesPerSample * kMaxChannels * kMaxSamplesPerPacket,
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// This limit is used by ParamTraits<VideoCaptureParams>.
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kMaxFramesPerSecond = 1000,
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};
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} // namespace limits
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} // namespace media
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#endif // MEDIA_BASE_LIMITS_H_
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