一帧AAC 音频静音数据

最新推荐文章于 2023-12-19 09:20:00 发布

原创最新推荐文章于 2023-12-19 09:20:00 发布 · 1.1k 阅读

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CC 4.0 BY-SA版权

这段代码初始化了一个用于AACLC音频的静音数据包。它设置了音频配置，如频率为8KHz，单声道，使用MPEG-4AudioChannelConfiguration，并生成了一个包含头部信息的数据缓冲区，用于承载6字节的音频数据包。

//初始化静音数据
   const int profile = 1; //AAC LC
   const int frequency_index = 0xb; //8KHz
   const int channel_configuration = 1; //MPEG-4 Audio Channel Configuration.
   unsigned int packetLen = 6;
   m_data_buffer.resize(13, 0x00);
   int m_data_len = 0;
   m_data_buffer[m_data_len++] = (char)0xFF;
   m_data_buffer[m_data_len++] = (char)0xF1;
   m_data_buffer[m_data_len++] = (char)(((profile - 1) << 6) + (frequency_index << 2) + (channel_configuration >> 2));
   m_data_buffer[m_data_len++] = (char)((channel_configuration & 0x3) << 6 | (packetLen >> 11));
   m_data_buffer[m_data_len++] = (char)((packetLen & 0x7FF) >> 3);
   m_data_buffer[m_data_len++] = (char)(((packetLen & 7) << 5) + 0x1F);
   m_data_buffer[m_data_len++] = (char)0xFC;
   m_data_buffer[m_data_len++] = (char)0x21;
   m_data_buffer[m_data_len++] = (char)0x10;
   m_data_buffer[m_data_len++] = (char)0x04;
   m_data_buffer[m_data_len++] = (char)0x60;
   m_data_buffer[m_data_len++] = (char)0x8C;
   m_data_buffer[m_data_len++] = (char)0x1C;