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For #1636, add comments

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winlin 2020-03-13 17:05:22 +08:00
parent aa20a04abb
commit 7036f839d2
2 changed files with 10 additions and 1 deletions
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7
trunk/src/protocol/srs_raw_avc.cpp
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@ -447,6 +447,13 @@ srs_error_t SrsRawAacStream::mux_sequence_header(SrsRawAacStreamCodec* codec, st
SrsAacObjectType audioObjectType = codec->aac_object;
char channelConfiguration = codec->channel_configuration;
// Here we are generating AAC sequence header, the ASC structure,
// because we have already parsed the sampling rate from AAC codec,
// which is more precise than the sound_rate defined by RTMP.
//
// For example, AAC sampling_frequency_index is 3(48000HZ) or 4(44100HZ),
// the sound_rate is always 3(44100HZ), if we covert sound_rate to
// sampling_frequency_index, we may make mistake.
char samplingFrequencyIndex = codec->sampling_frequency_index;
if (samplingFrequencyIndex >= SrsAAcSampleRateNumbers) {
samplingFrequencyIndex = 4; // Default to 44100