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update components

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This commit is contained in:
Luke Pulverenti 2016-01-13 15:58:12 -05:00
parent c6b706f48a
commit 5de2e610ce
35 changed files with 1420 additions and 1130 deletions
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132
dashboard-ui/bower_components/hls.js/src/demux/adts.js vendored Normal file
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/**
* ADTS parser helper
*/
import {logger} from '../utils/logger';
import {ErrorTypes, ErrorDetails} from '../errors';
class ADTS {
static getAudioConfig(observer, data, offset, audioCodec) {
var adtsObjectType, // :int
adtsSampleingIndex, // :int
adtsExtensionSampleingIndex, // :int
adtsChanelConfig, // :int
config,
userAgent = navigator.userAgent.toLowerCase(),
adtsSampleingRates = [
96000, 88200,
64000, 48000,
44100, 32000,
24000, 22050,
16000, 12000,
11025, 8000,
7350];
// byte 2
adtsObjectType = ((data[offset + 2] & 0xC0) >>> 6) + 1;
adtsSampleingIndex = ((data[offset + 2] & 0x3C) >>> 2);
if(adtsSampleingIndex > adtsSampleingRates.length-1) {
observer.trigger(Event.ERROR, {type: ErrorTypes.MEDIA_ERROR, details: ErrorDetails.FRAG_PARSING_ERROR, fatal: true, reason: `invalid ADTS sampling index:${adtsSampleingIndex}`});
return;
}
adtsChanelConfig = ((data[offset + 2] & 0x01) << 2);
// byte 3
adtsChanelConfig |= ((data[offset + 3] & 0xC0) >>> 6);
logger.log(`manifest codec:${audioCodec},ADTS data:type:${adtsObjectType},sampleingIndex:${adtsSampleingIndex}[${adtsSampleingRates[adtsSampleingIndex]}Hz],channelConfig:${adtsChanelConfig}`);
// firefox: freq less than 24kHz = AAC SBR (HE-AAC)
if (userAgent.indexOf('firefox') !== -1) {
if (adtsSampleingIndex >= 6) {
adtsObjectType = 5;
config = new Array(4);
// HE-AAC uses SBR (Spectral Band Replication) , high frequencies are constructed from low frequencies
// there is a factor 2 between frame sample rate and output sample rate
// multiply frequency by 2 (see table below, equivalent to substract 3)
adtsExtensionSampleingIndex = adtsSampleingIndex - 3;
} else {
adtsObjectType = 2;
config = new Array(2);
adtsExtensionSampleingIndex = adtsSampleingIndex;
}
// Android : always use AAC
} else if (userAgent.indexOf('android') !== -1) {
adtsObjectType = 2;
config = new Array(2);
adtsExtensionSampleingIndex = adtsSampleingIndex;
} else {
/* for other browsers (chrome ...)
always force audio type to be HE-AAC SBR, as some browsers do not support audio codec switch properly (like Chrome ...)
*/
adtsObjectType = 5;
config = new Array(4);
// if (manifest codec is HE-AAC or HE-AACv2) OR (manifest codec not specified AND frequency less than 24kHz)
if ((audioCodec && ((audioCodec.indexOf('mp4a.40.29') !== -1) ||
(audioCodec.indexOf('mp4a.40.5') !== -1))) ||
(!audioCodec && adtsSampleingIndex >= 6)) {
// HE-AAC uses SBR (Spectral Band Replication) , high frequencies are constructed from low frequencies
// there is a factor 2 between frame sample rate and output sample rate
// multiply frequency by 2 (see table below, equivalent to substract 3)
adtsExtensionSampleingIndex = adtsSampleingIndex - 3;
} else {
// if (manifest codec is AAC) AND (frequency less than 24kHz OR nb channel is 1) OR (manifest codec not specified and mono audio)
// Chrome fails to play back with AAC LC mono when initialized with HE-AAC. This is not a problem with stereo.
if (audioCodec && audioCodec.indexOf('mp4a.40.2') !== -1 && (adtsSampleingIndex >= 6 || adtsChanelConfig === 1) ||
(!audioCodec && adtsChanelConfig === 1)) {
adtsObjectType = 2;
config = new Array(2);
}
adtsExtensionSampleingIndex = adtsSampleingIndex;
}
}
/* refer to http://wiki.multimedia.cx/index.php?title=MPEG-4_Audio#Audio_Specific_Config
ISO 14496-3 (AAC).pdf - Table 1.13 — Syntax of AudioSpecificConfig()
Audio Profile / Audio Object Type
0: Null
1: AAC Main
2: AAC LC (Low Complexity)
3: AAC SSR (Scalable Sample Rate)
4: AAC LTP (Long Term Prediction)
5: SBR (Spectral Band Replication)
6: AAC Scalable
sampling freq
0: 96000 Hz
1: 88200 Hz
2: 64000 Hz
3: 48000 Hz
4: 44100 Hz
5: 32000 Hz
6: 24000 Hz
7: 22050 Hz
8: 16000 Hz
9: 12000 Hz
10: 11025 Hz
11: 8000 Hz
12: 7350 Hz
13: Reserved
14: Reserved
15: frequency is written explictly
Channel Configurations
These are the channel configurations:
0: Defined in AOT Specifc Config
1: 1 channel: front-center
2: 2 channels: front-left, front-right
*/
// audioObjectType = profile => profile, the MPEG-4 Audio Object Type minus 1
config[0] = adtsObjectType << 3;
// samplingFrequencyIndex
config[0] |= (adtsSampleingIndex & 0x0E) >> 1;
config[1] |= (adtsSampleingIndex & 0x01) << 7;
// channelConfiguration
config[1] |= adtsChanelConfig << 3;
if (adtsObjectType === 5) {
// adtsExtensionSampleingIndex
config[1] |= (adtsExtensionSampleingIndex & 0x0E) >> 1;
config[2] = (adtsExtensionSampleingIndex & 0x01) << 7;
// adtsObjectType (force to 2, chrome is checking that object type is less than 5 ???
// https://chromium.googlesource.com/chromium/src.git/+/master/media/formats/mp4/aac.cc
config[2] |= 2 << 2;
config[3] = 0;
}
return {config: config, samplerate: adtsSampleingRates[adtsSampleingIndex], channelCount: adtsChanelConfig, codec: ('mp4a.40.' + adtsObjectType)};
}
}
export default ADTS;