113 lines
2.5 KiB
JavaScript
113 lines
2.5 KiB
JavaScript
JSMpeg.Decoder.Base = (function(){ "use strict";
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var BaseDecoder = function(options) {
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this.destination = null;
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this.canPlay = false;
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this.collectTimestamps = !options.streaming;
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this.bytesWritten = 0;
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this.timestamps = [];
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this.timestampIndex = 0;
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this.startTime = 0;
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this.decodedTime = 0;
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Object.defineProperty(this, 'currentTime', {get: this.getCurrentTime});
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};
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BaseDecoder.prototype.destroy = function() {};
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BaseDecoder.prototype.connect = function(destination) {
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this.destination = destination;
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};
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BaseDecoder.prototype.bufferGetIndex = function() {
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return this.bits.index;
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};
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BaseDecoder.prototype.bufferSetIndex = function(index) {
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this.bits.index = index;
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};
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BaseDecoder.prototype.bufferWrite = function(buffers) {
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return this.bits.write(buffers);
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};
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BaseDecoder.prototype.write = function(pts, buffers) {
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if (this.collectTimestamps) {
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if (this.timestamps.length === 0) {
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this.startTime = pts;
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this.decodedTime = pts;
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}
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this.timestamps.push({index: this.bytesWritten << 3, time: pts});
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}
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this.bytesWritten += this.bufferWrite(buffers);
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this.canPlay = true;
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};
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BaseDecoder.prototype.seek = function(time) {
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if (!this.collectTimestamps) {
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return;
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}
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this.timestampIndex = 0;
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for (var i = 0; i < this.timestamps.length; i++) {
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if (this.timestamps[i].time > time) {
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break;
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}
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this.timestampIndex = i;
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}
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var ts = this.timestamps[this.timestampIndex];
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if (ts) {
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this.bufferSetIndex(ts.index);
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this.decodedTime = ts.time;
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}
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else {
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this.bufferSetIndex(0);
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this.decodedTime = this.startTime;
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}
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};
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BaseDecoder.prototype.decode = function() {
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this.advanceDecodedTime(0);
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};
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BaseDecoder.prototype.advanceDecodedTime = function(seconds) {
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if (this.collectTimestamps) {
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var newTimestampIndex = -1;
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var currentIndex = this.bufferGetIndex();
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for (var i = this.timestampIndex; i < this.timestamps.length; i++) {
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if (this.timestamps[i].index > currentIndex) {
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break;
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}
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newTimestampIndex = i;
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}
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// Did we find a new PTS, different from the last? If so, we don't have
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// to advance the decoded time manually and can instead sync it exactly
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// to the PTS.
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if (
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newTimestampIndex !== -1 &&
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newTimestampIndex !== this.timestampIndex
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) {
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this.timestampIndex = newTimestampIndex;
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this.decodedTime = this.timestamps[this.timestampIndex].time;
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return;
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}
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}
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this.decodedTime += seconds;
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};
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BaseDecoder.prototype.getCurrentTime = function() {
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return this.decodedTime;
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};
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return BaseDecoder;
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})();
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