6c5f939e23
Requires a browser with MediaSource extension support, and Opus support for the source buffers. In practice, that is Chrome and Firefox.
554 lines
17 KiB
JavaScript
554 lines
17 KiB
JavaScript
"use strict";
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/*
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Copyright (C) 2014 by Jeremy P. White <jwhite@codeweavers.com>
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This file is part of spice-html5.
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spice-html5 is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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spice-html5 is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with spice-html5. If not, see <http://www.gnu.org/licenses/>.
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*/
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/*----------------------------------------------------------------------------
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** EBML identifiers
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**--------------------------------------------------------------------------*/
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var EBML_HEADER = [ 0x1a, 0x45, 0xdf, 0xa3 ];
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var EBML_HEADER_VERSION = [ 0x42, 0x86 ];
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var EBML_HEADER_READ_VERSION = [ 0x42, 0xf7 ];
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var EBML_HEADER_MAX_ID_LENGTH = [ 0x42, 0xf2 ];
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var EBML_HEADER_MAX_SIZE_LENGTH = [ 0x42, 0xf3 ];
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var EBML_HEADER_DOC_TYPE = [ 0x42, 0x82 ];
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var EBML_HEADER_DOC_TYPE_VERSION = [ 0x42, 0x87 ];
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var EBML_HEADER_DOC_TYPE_READ_VERSION = [ 0x42, 0x85 ];
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var WEBM_SEGMENT_HEADER = [ 0x18, 0x53, 0x80, 0x67 ];
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var WEBM_SEGMENT_INFORMATION = [ 0x15, 0x49, 0xA9, 0x66 ];
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var WEBM_TIMECODE_SCALE = [ 0x2A, 0xD7, 0xB1 ];
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var WEBM_MUXING_APP = [ 0x4D, 0x80 ];
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var WEBM_WRITING_APP = [ 0x57, 0x41 ];
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var WEBM_SEEK_HEAD = [ 0x11, 0x4D, 0x9B, 0x74 ];
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var WEBM_SEEK = [ 0x4D, 0xBB ];
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var WEBM_SEEK_ID = [ 0x53, 0xAB ];
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var WEBM_SEEK_POSITION = [ 0x53, 0xAC ];
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var WEBM_TRACKS = [ 0x16, 0x54, 0xAE, 0x6B ];
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var WEBM_TRACK_ENTRY = [ 0xAE ];
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var WEBM_TRACK_NUMBER = [ 0xD7 ];
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var WEBM_TRACK_UID = [ 0x73, 0xC5 ];
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var WEBM_TRACK_TYPE = [ 0x83 ];
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var WEBM_FLAG_ENABLED = [ 0xB9 ];
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var WEBM_FLAG_DEFAULT = [ 0x88 ];
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var WEBM_FLAG_FORCED = [ 0x55, 0xAA ];
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var WEBM_FLAG_LACING = [ 0x9C ];
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var WEBM_MIN_CACHE = [ 0x6D, 0xE7 ];
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var WEBM_MAX_BLOCK_ADDITION_ID = [ 0x55, 0xEE ];
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var WEBM_CODEC_DECODE_ALL = [ 0xAA ];
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var WEBM_SEEK_PRE_ROLL = [ 0x56, 0xBB ];
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var WEBM_CODEC_DELAY = [ 0x56, 0xAA ];
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var WEBM_CODEC_PRIVATE = [ 0x63, 0xA2 ];
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var WEBM_CODEC_ID = [ 0x86 ];
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var WEBM_AUDIO = [ 0xE1 ] ;
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var WEBM_SAMPLING_FREQUENCY = [ 0xB5 ] ;
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var WEBM_CHANNELS = [ 0x9F ] ;
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var WEBM_CLUSTER = [ 0x1F, 0x43, 0xB6, 0x75 ];
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var WEBM_TIME_CODE = [ 0xE7 ] ;
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var WEBM_SIMPLE_BLOCK = [ 0xA3 ] ;
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/*----------------------------------------------------------------------------
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** Various OPUS / Webm constants
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**--------------------------------------------------------------------------*/
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var CLUSTER_SIMPLEBLOCK_FLAG_KEYFRAME = 1 << 7;
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var OPUS_FREQUENCY = 48000;
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var OPUS_CHANNELS = 2;
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var SPICE_PLAYBACK_CODEC = 'audio/webm; codecs="opus"';
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var MAX_CLUSTER_TIME = 1000;
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var GAP_DETECTION_THRESHOLD = 50;
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/*----------------------------------------------------------------------------
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** EBML utility functions
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** These classes can create the binary representation of a webm file
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**--------------------------------------------------------------------------*/
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function EBML_write_u1_data_len(len, dv, at)
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{
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var b = 0x80 | len;
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dv.setUint8(at, b);
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return at + 1;
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}
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function EBML_write_u8_value(id, val, dv, at)
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{
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at = EBML_write_array(id, dv, at);
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at = EBML_write_u1_data_len(1, dv, at);
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dv.setUint8(at, val);
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return at + 1;
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}
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function EBML_write_u32_value(id, val, dv, at)
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{
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at = EBML_write_array(id, dv, at);
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at = EBML_write_u1_data_len(4, dv, at);
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dv.setUint32(at, val);
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return at + 4;
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}
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function EBML_write_u16_value(id, val, dv, at)
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{
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at = EBML_write_array(id, dv, at);
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at = EBML_write_u1_data_len(2, dv, at);
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dv.setUint16(at, val);
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return at + 2;
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}
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function EBML_write_float_value(id, val, dv, at)
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{
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at = EBML_write_array(id, dv, at);
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at = EBML_write_u1_data_len(4, dv, at);
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dv.setFloat32(at, val);
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return at + 4;
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}
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function EBML_write_u64_data_len(len, dv, at)
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{
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/* Javascript doesn't do 64 bit ints, so this cheats and
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just has a max of 32 bits. Fine for our purposes */
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dv.setUint8(at++, 0x01);
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dv.setUint8(at++, 0x00);
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dv.setUint8(at++, 0x00);
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dv.setUint8(at++, 0x00);
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var val = len & 0xFFFFFFFF;
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for (var shift = 24; shift >= 0; shift -= 8)
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dv.setUint8(at++, val >> shift);
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return at;
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}
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function EBML_write_array(arr, dv, at)
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{
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for (var i = 0; i < arr.length; i++)
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dv.setUint8(at + i, arr[i]);
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return at + arr.length;
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}
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function EBML_write_string(str, dv, at)
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{
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for (var i = 0; i < str.length; i++)
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dv.setUint8(at + i, str.charCodeAt(i));
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return at + str.length;
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}
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function EBML_write_data(id, data, dv, at)
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{
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at = EBML_write_array(id, dv, at);
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if (data.length < 127)
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at = EBML_write_u1_data_len(data.length, dv, at);
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else
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at = EBML_write_u64_data_len(data.length, dv, at);
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if ((typeof data) == "string")
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at = EBML_write_string(data, dv, at);
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else
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at = EBML_write_array(data, dv, at);
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return at;
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}
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/*----------------------------------------------------------------------------
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** Webm objects
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** These classes can create the binary representation of a webm file
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**--------------------------------------------------------------------------*/
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function EBMLHeader()
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{
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this.id = EBML_HEADER;
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this.Version = 1;
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this.ReadVersion = 1;
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this.MaxIDLength = 4;
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this.MaxSizeLength = 8;
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this.DocType = "webm";
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this.DocTypeVersion = 2; /* Not well specified by the WebM guys, but functionally required for Firefox */
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this.DocTypeReadVersion = 2;
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}
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EBMLHeader.prototype =
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{
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to_buffer: function(a, at)
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{
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at = at || 0;
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var dv = new DataView(a);
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at = EBML_write_array(this.id, dv, at);
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at = EBML_write_u64_data_len(0x1f, dv, at);
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at = EBML_write_u8_value(EBML_HEADER_VERSION, this.Version, dv, at);
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at = EBML_write_u8_value(EBML_HEADER_READ_VERSION, this.ReadVersion, dv, at);
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at = EBML_write_u8_value(EBML_HEADER_MAX_ID_LENGTH, this.MaxIDLength, dv, at);
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at = EBML_write_u8_value(EBML_HEADER_MAX_SIZE_LENGTH, this.MaxSizeLength, dv, at);
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at = EBML_write_data(EBML_HEADER_DOC_TYPE, this.DocType, dv, at);
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at = EBML_write_u8_value(EBML_HEADER_DOC_TYPE_VERSION, this.DocTypeVersion, dv, at);
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at = EBML_write_u8_value(EBML_HEADER_DOC_TYPE_READ_VERSION, this.DocTypeReadVersion, dv, at);
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return at;
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},
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buffer_size: function()
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{
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return 0x1f + 8 + this.id.length;
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},
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}
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function webm_Segment()
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{
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this.id = WEBM_SEGMENT_HEADER;
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}
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webm_Segment.prototype =
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{
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to_buffer: function(a, at)
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{
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at = at || 0;
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var dv = new DataView(a);
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at = EBML_write_array(this.id, dv, at);
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dv.setUint8(at++, 0xff);
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return at;
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},
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buffer_size: function()
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{
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return this.id.length + 1;
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},
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}
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function webm_SegmentInformation()
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{
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this.id = WEBM_SEGMENT_INFORMATION;
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this.timecode_scale = 1000000; /* 1 ms */
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this.muxing_app = "spice";
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this.writing_app = "spice-html5";
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}
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webm_SegmentInformation.prototype =
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{
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to_buffer: function(a, at)
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{
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at = at || 0;
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var dv = new DataView(a);
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at = EBML_write_array(this.id, dv, at);
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at = EBML_write_u64_data_len(this.buffer_size() - 8 - this.id.length, dv, at);
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at = EBML_write_u32_value(WEBM_TIMECODE_SCALE, this.timecode_scale, dv, at);
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at = EBML_write_data(WEBM_MUXING_APP, this.muxing_app, dv, at);
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at = EBML_write_data(WEBM_WRITING_APP, this.writing_app, dv, at);
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return at;
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},
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buffer_size: function()
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{
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return this.id.length + 8 +
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WEBM_TIMECODE_SCALE.length + 1 + 4 +
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WEBM_MUXING_APP.length + 1 + this.muxing_app.length +
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WEBM_WRITING_APP.length + 1 + this.writing_app.length;
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},
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}
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function webm_Audio(frequency)
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{
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this.id = WEBM_AUDIO;
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this.sampling_frequency = frequency;
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this.channels = OPUS_CHANNELS;
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}
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webm_Audio.prototype =
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{
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to_buffer: function(a, at)
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{
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at = at || 0;
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var dv = new DataView(a);
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at = EBML_write_array(this.id, dv, at);
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at = EBML_write_u64_data_len(this.buffer_size() - 8 - this.id.length, dv, at);
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at = EBML_write_u8_value(WEBM_CHANNELS, this.channels, dv, at);
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at = EBML_write_float_value(WEBM_SAMPLING_FREQUENCY, this.sampling_frequency, dv, at);
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return at;
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},
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buffer_size: function()
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{
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return this.id.length + 8 +
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WEBM_SAMPLING_FREQUENCY.length + 1 + 4 +
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WEBM_CHANNELS.length + 1 + 1;
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},
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}
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/* ---------------------------
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SeekHead not currently used. Hopefully not needed.
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*/
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function webm_Seek(seekid, pos)
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{
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this.id = WEBM_SEEK;
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this.pos = pos;
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this.seekid = seekid;
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}
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webm_Seek.prototype =
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{
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to_buffer: function(a, at)
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{
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at = at || 0;
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var dv = new DataView(a);
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at = EBML_write_array(this.id, dv, at);
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at = EBML_write_u1_data_len(this.buffer_size() - 1 - this.id.length, dv, at);
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at = EBML_write_data(WEBM_SEEK_ID, this.seekid, dv, at)
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at = EBML_write_u16_value(WEBM_SEEK_POSITION, this.pos, dv, at)
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return at;
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},
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buffer_size: function()
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{
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return this.id.length + 1 +
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WEBM_SEEK_ID.length + 1 + this.seekid.length +
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WEBM_SEEK_POSITION.length + 1 + 2;
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},
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}
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function webm_SeekHead(info_pos, track_pos)
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{
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this.id = WEBM_SEEK_HEAD;
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this.info = new webm_Seek(WEBM_SEGMENT_INFORMATION, info_pos);
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this.track = new webm_Seek(WEBM_TRACKS, track_pos);
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}
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webm_SeekHead.prototype =
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{
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to_buffer: function(a, at)
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{
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at = at || 0;
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var dv = new DataView(a);
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at = EBML_write_array(this.id, dv, at);
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at = EBML_write_u64_data_len(this.buffer_size() - 8 - this.id.length, dv, at);
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at = this.info.to_buffer(a, at);
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at = this.track.to_buffer(a, at);
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return at;
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},
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buffer_size: function()
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{
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return this.id.length + 8 +
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this.info.buffer_size() +
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this.track.buffer_size();
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},
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}
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/* -------------------------------
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End of Seek Head
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*/
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function webm_TrackEntry()
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{
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this.id = WEBM_TRACK_ENTRY;
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this.number = 1;
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this.uid = 1;
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this.type = 2; // Audio
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this.flag_enabled = 1;
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this.flag_default = 1;
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this.flag_forced = 1;
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this.flag_lacing = 0;
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this.min_cache = 0; // fixme - check
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this.max_block_addition_id = 0;
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this.codec_decode_all = 0; // fixme - check
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this.seek_pre_roll = 0; // 80000000; // fixme - check
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this.codec_delay = 80000000; // Must match codec_private.preskip
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this.codec_id = "A_OPUS";
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this.audio = new webm_Audio(OPUS_FREQUENCY);
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// See: http://tools.ietf.org/html/draft-terriberry-oggopus-01
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this.codec_private = [ 0x4f, 0x70, 0x75, 0x73, 0x48, 0x65, 0x61, 0x64, // OpusHead
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0x01, // Version
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OPUS_CHANNELS,
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0x00, 0x0F, // Preskip - 3840 samples - should be 8ms at 48kHz
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0x80, 0xbb, 0x00, 0x00, // 48000
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0x00, 0x00, // Output gain
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0x00 // Channel mapping family
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];
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}
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webm_TrackEntry.prototype =
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{
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to_buffer: function(a, at)
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{
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at = at || 0;
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var dv = new DataView(a);
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at = EBML_write_array(this.id, dv, at);
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at = EBML_write_u64_data_len(this.buffer_size() - 8 - this.id.length, dv, at);
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at = EBML_write_u8_value(WEBM_TRACK_NUMBER, this.number, dv, at);
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at = EBML_write_u8_value(WEBM_TRACK_UID, this.uid, dv, at);
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at = EBML_write_u8_value(WEBM_FLAG_ENABLED, this.flag_enabled, dv, at);
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at = EBML_write_u8_value(WEBM_FLAG_DEFAULT, this.flag_default, dv, at);
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at = EBML_write_u8_value(WEBM_FLAG_FORCED, this.flag_forced, dv, at);
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at = EBML_write_u8_value(WEBM_FLAG_LACING, this.flag_lacing, dv, at);
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at = EBML_write_data(WEBM_CODEC_ID, this.codec_id, dv, at);
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at = EBML_write_u8_value(WEBM_MIN_CACHE, this.min_cache, dv, at);
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at = EBML_write_u8_value(WEBM_MAX_BLOCK_ADDITION_ID, this.max_block_addition_id, dv, at);
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at = EBML_write_u8_value(WEBM_CODEC_DECODE_ALL, this.codec_decode_all, dv, at);
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at = EBML_write_u32_value(WEBM_CODEC_DELAY, this.codec_delay, dv, at);
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at = EBML_write_u32_value(WEBM_SEEK_PRE_ROLL, this.seek_pre_roll, dv, at);
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at = EBML_write_u8_value(WEBM_TRACK_TYPE, this.type, dv, at);
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at = EBML_write_data(WEBM_CODEC_PRIVATE, this.codec_private, dv, at);
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at = this.audio.to_buffer(a, at);
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return at;
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},
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buffer_size: function()
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{
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return this.id.length + 8 +
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WEBM_TRACK_NUMBER.length + 1 + 1 +
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WEBM_TRACK_UID.length + 1 + 1 +
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WEBM_TRACK_TYPE.length + 1 + 1 +
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WEBM_FLAG_ENABLED.length + 1 + 1 +
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WEBM_FLAG_DEFAULT.length + 1 + 1 +
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WEBM_FLAG_FORCED.length + 1 + 1 +
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WEBM_FLAG_LACING.length + 1 + 1 +
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WEBM_MIN_CACHE.length + 1 + 1 +
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WEBM_MAX_BLOCK_ADDITION_ID.length + 1 + 1 +
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WEBM_CODEC_DECODE_ALL.length + 1 + 1 +
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WEBM_SEEK_PRE_ROLL.length + 1 + 4 +
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WEBM_CODEC_DELAY.length + 1 + 4 +
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WEBM_CODEC_ID.length + this.codec_id.length + 1 +
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WEBM_CODEC_PRIVATE.length + 1 + this.codec_private.length +
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this.audio.buffer_size();
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},
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}
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function webm_Tracks(entry)
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{
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this.id = WEBM_TRACKS;
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this.track_entry = entry;
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}
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webm_Tracks.prototype =
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{
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to_buffer: function(a, at)
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{
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at = at || 0;
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var dv = new DataView(a);
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at = EBML_write_array(this.id, dv, at);
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at = EBML_write_u64_data_len(this.buffer_size() - 8 - this.id.length, dv, at);
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at = this.track_entry.to_buffer(a, at);
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return at;
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},
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buffer_size: function()
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{
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return this.id.length + 8 +
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this.track_entry.buffer_size();
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},
|
|
}
|
|
|
|
function webm_Cluster(timecode, data)
|
|
{
|
|
this.id = WEBM_CLUSTER;
|
|
this.timecode = timecode;
|
|
this.data = data;
|
|
}
|
|
|
|
webm_Cluster.prototype =
|
|
{
|
|
to_buffer: function(a, at)
|
|
{
|
|
at = at || 0;
|
|
var dv = new DataView(a);
|
|
at = EBML_write_array(this.id, dv, at);
|
|
dv.setUint8(at++, 0xff);
|
|
at = EBML_write_u32_value(WEBM_TIME_CODE, this.timecode, dv, at);
|
|
return at;
|
|
},
|
|
buffer_size: function()
|
|
{
|
|
return this.id.length + 1 +
|
|
WEBM_TIME_CODE.length + 1 + 4;
|
|
},
|
|
}
|
|
|
|
function webm_SimpleBlock(timecode, data, keyframe)
|
|
{
|
|
this.id = WEBM_SIMPLE_BLOCK;
|
|
this.timecode = timecode;
|
|
this.data = data;
|
|
this.keyframe = keyframe;
|
|
}
|
|
|
|
webm_SimpleBlock.prototype =
|
|
{
|
|
to_buffer: function(a, at)
|
|
{
|
|
at = at || 0;
|
|
var dv = new DataView(a);
|
|
at = EBML_write_array(this.id, dv, at);
|
|
at = EBML_write_u64_data_len(this.data.byteLength + 4, dv, at);
|
|
at = EBML_write_u1_data_len(1, dv, at); // Track #
|
|
dv.setUint16(at, this.timecode); at += 2; // timecode - relative to cluster
|
|
dv.setUint8(at, this.keyframe ? CLUSTER_SIMPLEBLOCK_FLAG_KEYFRAME : 0); at += 1; // flags
|
|
|
|
// FIXME - There should be a better way to copy
|
|
var u8 = new Uint8Array(this.data);
|
|
for (var i = 0; i < this.data.byteLength; i++)
|
|
dv.setUint8(at++, u8[i]);
|
|
|
|
return at;
|
|
},
|
|
buffer_size: function()
|
|
{
|
|
return this.id.length + 8 +
|
|
1 + 2 + 1 +
|
|
this.data.byteLength;
|
|
},
|
|
}
|
|
|
|
function webm_Header()
|
|
{
|
|
this.ebml = new EBMLHeader;
|
|
this.segment = new webm_Segment;
|
|
this.seek_head = new webm_SeekHead(0, 0);
|
|
|
|
this.seek_head.info.pos = this.segment.buffer_size() + this.seek_head.buffer_size();
|
|
|
|
this.info = new webm_SegmentInformation;
|
|
|
|
this.seek_head.track.pos = this.seek_head.info.pos + this.info.buffer_size();
|
|
|
|
this.track_entry = new webm_TrackEntry;
|
|
this.tracks = new webm_Tracks(this.track_entry);
|
|
}
|
|
|
|
webm_Header.prototype =
|
|
{
|
|
to_buffer: function(a, at)
|
|
{
|
|
at = at || 0;
|
|
at = this.ebml.to_buffer(a, at);
|
|
at = this.segment.to_buffer(a, at);
|
|
at = this.info.to_buffer(a, at);
|
|
at = this.tracks.to_buffer(a, at);
|
|
|
|
return at;
|
|
},
|
|
buffer_size: function()
|
|
{
|
|
return this.ebml.buffer_size() +
|
|
this.segment.buffer_size() +
|
|
this.info.buffer_size() +
|
|
this.tracks.buffer_size();
|
|
},
|
|
}
|