【werbtc audio 】audio_codecs 构建及与audio_coding关系

本文详细介绍了如何构建WebRTC中的音频编解码器,包括audio_codecs API和具体实现audio_coding模块。在构建audio_codecs如audio_encoder_g711和opus时,依赖于audio_coding模块提供的具体编解码器实现。构建过程涉及到rtc_source_set、静态库和BUILD.gn配置文件。

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  • audio_codecs 是编解码器的api 一类的,factory一类的
  • moudle里的audio_coding 是编解码器的具体实现。
  • 所以,构建每个audio_codecs 的编解码器的时候,需要依赖于audio_coding 中的编解码器的具体实现 。
  • 比如 audio_codecs 中 audio_encoder_g711 编码器 的构建, 依赖于 audio_codecs_api 和 audio_coding :g711
  • 在这里插入图片描述

audio_codecs 构建

在这里插入图片描述

源码 rtc_source_set(“audio_codecs_api”)

### AOT AAC LC Audio Encoding Format Details In the context of Advanced Audio Coding (AAC), the Low Complexity profile (LC) is one of several profiles designed to provide efficient compression with a balance between quality and computational requirements[^2]. The Object Type Identifier for AAC-LC is specified as `2` within the MPEG-4 standard, indicating this particular variant among other possible object types such as Main or SSR[^3]. When dealing specifically with MP4 files that contain both video and audio streams where the latter often employs AAC coding, extracting just the audio component involves understanding how these codecs are configured at their core level. For instance, when encountering an AAC packet type equal to 1, it signifies raw unadulterated audio data which requires parsing through configurations like those found inside `AudioSpecificConfig` structures during construction phases involving headers like ADTS (Audio Data Transport Stream)[^1]. To work programmatically with AOT AAC LC encoded content using Android APIs: ```java mediaFormat.setInteger(MediaFormat.KEY_AAC_PROFILE, MediaCodecInfo.CodecProfileLevel.AACObjectLC); ``` This snippet sets up media format parameters specifying usage of the AAC-LC profile. --related questions-- 1. How does setting KEY_AAC_PROFILE affect playback performance? 2. What differences exist between various AAC profiles besides complexity levels? 3. Can you explain more about constructing valid ADTS frames from raw AAC packets? 4. Are there any specific considerations while handling multiple tracks within an MP4 container?
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