2a09d1a4
 liuqimichale
添加宜春 天水 宣化
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/**
* @file - codecs.js - Handles tasks regarding codec strings such as translating them to
* codec strings, or translating codec strings into objects that can be examined.
*/
/**
* Parses a codec string to retrieve the number of codecs specified,
* the video codec and object type indicator, and the audio profile.
*/
export const parseCodecs = function(codecs = '') {
let result = {
codecCount: 0
};
let parsed;
result.codecCount = codecs.split(',').length;
result.codecCount = result.codecCount || 2;
// parse the video codec
parsed = (/(^|\s|,)+(avc1)([^ ,]*)/i).exec(codecs);
if (parsed) {
result.videoCodec = parsed[2];
result.videoObjectTypeIndicator = parsed[3];
}
// parse the last field of the audio codec
result.audioProfile =
(/(^|\s|,)+mp4a.[0-9A-Fa-f]+\.([0-9A-Fa-f]+)/i).exec(codecs);
result.audioProfile = result.audioProfile && result.audioProfile[2];
return result;
};
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