| commit | 24899e58ecb10157fea418d80022b938c0f806a9 | [log] [tgz] |
|---|---|---|
| author | aleloi <aleloi@webrtc.org> | Tue Feb 21 05:06:29 2017 -0800 |
| committer | Commit bot <commit-bot@chromium.org> | Tue Feb 21 13:06:29 2017 +0000 |
| tree | 1f06bc1fd9cfecfc84f1e6749e9cd733ea03f7cd | |
| parent | 76094ee6979f5299ffddd1909cef7eaf67855fcb [diff] |
Optionally disable APM limiter in AudioMixer. The APM limiter is a component for keeping the audio from clipping by smoothly reducing the amplitude of the audio samples. It can be rather expensive because of band-splitting & merging. Also, experiments indicate that it is of questionable benefit (adding several sources of human speech almost never cause clipping). To optionally disable the limiter, this CL does some refactoring on the (quite large) AudioMixerImpl. Functionality related to actual addition of frames and handling AudioFrame meta-data (sample_rate, num_channels, samples_per_channel, time_stamp, elapsed_time_ms) is broken out in a new sub-component called FrameCombiner. The FrameCombiner is initialized with a 'use_limiter' flag. To create a mixer without using the APM limiter Inside of FrameCombiner, the meta-data handling and the audio sample addition are kept divided from each other. This also fixes a few minor GN issues so that warnings do not have to be suppressed. BUG=webrtc:7167 Review-Url: https://codereview.webrtc.org/2692333002 Cr-Commit-Position: refs/heads/master@{#16742}
WebRTC is a free, open software project that provides browsers and mobile applications with Real-Time Communications (RTC) capabilities via simple APIs. The WebRTC components have been optimized to best serve this purpose.
Our mission: To enable rich, high-quality RTC applications to be developed for the browser, mobile platforms, and IoT devices, and allow them all to communicate via a common set of protocols.
The WebRTC initiative is a project supported by Google, Mozilla and Opera, amongst others. This page is maintained by the Google Chrome team.
See http://www.webrtc.org/native-code/development for instructions on how to get started developing with the native code.