2月27日的PCM Recorder应用程序分析

This is a simple voice recorder. For recording, you can select the linear PCM (WAV) format for lossless compression or the AAC format for lossy compression. Also supports long-time recording in the background. The sampling rate can be changed to 8k, 16k, 44.1k, 48kHz. * Call recording is not supported. Record: - Recording in high-quality linear PCM (WAV) format - Recording in highly compressed AAC (M4A) format - Recording in the background - Change of sampling rate (8k, 16k, 44.1k, 48kHz) - Unlimited recording time (up to 2GB) - Bitrate change (64-192kbps, AAC format only) - Change microphone gain - Change monaural or stereo Playback: - Playback in the background - Rename file - Sort files - Repeat playback (one song, whole) - Change of playback speed (0.5x, 0.75x, 1.25x, 1.5x, 2.0x) - Playback ± 10 seconds, ± 60 seconds - File sharing Permission: - record audio - wake lock (to background recording) - write to external storage (to store recordings) - internet access (only for ads) - access network state (only for ads） - read phone state(to record properly when the call comes in)