diff --git a/Makefile b/Makefile new file mode 100644 index 0000000..9597aac --- /dev/null +++ b/Makefile @@ -0,0 +1,9 @@ +TARGET_FILE = webm-writer-$(VERSION).js + +TEST_COPY = test/videowriter/webm-writer-$(VERSION).js + +$(TEST_COPY) : $(TARGET_FILE) + cp $(TARGET_FILE) $(TEST_COPY) + +$(TARGET_FILE) : src/arraybufferdatastream.js src/blobbuffer.js src/webm-writer.js + cat $^ > $(TARGET_FILE) \ No newline at end of file diff --git a/Readme.md b/Readme.md new file mode 100644 index 0000000..eef7cbc --- /dev/null +++ b/Readme.md @@ -0,0 +1,70 @@ +# WebM Writer for JavaScript + +This is a JavaScript-based WebM video encoder based on the ideas from [Whammy][]. It allows you to turn a series of +Canvas frames into a WebM video. + +This implementation allows you to create very large video files (exceeding the size of available memory), because it +can stream chunks immediately to a file on disk using a [FileWriter][] while the video is being constructed, instead of +needing to buffer the entire video in memory before saving can begin. Video sizes in excess of 4GB can be written. +The implementation currently tops out at 32GB, but this could be extended. + +When a FileWriter is not available, it can instead buffer the video in memory as a series of Blobs which are eventually +returned to the calling code as one composite Blob. This Blob can be displayed in a <video> element, transmitted +to a server, or used for some other purpose. Note that Chrome has a [Blob size limit][] of 500MB. + +[FileWriter]: https://developer.chrome.com/apps/fileSystem +[Whammy]: https://github.com/antimatter15/whammy +[Blob size limit]: https://github.com/eligrey/FileSaver.js/ + +## Usage + +Include the script in your header: + +```html + +``` + +First construct the writer, passing in any options you want to customize: + +```js +var videoWriter = new WebMWriter({ + quality: 0.95, // WebM image quality from 0.0 (worst) to 1.0 (best) + fileWriter: null, // FileWriter in order to stream to a file instead of buffering to memory (optional) + + // You must supply one of: + frameDuration: null, // Duration of frames in milliseconds + frameRate: null, // Number of frames per second +}); +``` + +Add as many Canvas frames as you like to build your video: + +```js +videoWriter.addFrame(canvas); +``` + +When you're done, you must call `complete()` to finish writing the video: + +```js +videoWriter.complete(); +``` + +`complete()` returns a Promise which resolves when writing is completed. + +If you didn't supply a `fileWriter` in the options, the Promise will resolve to Blob which represents the video. You +could display this blob in an HTML5 <video> tag: + +```js +videoWriter.complete().then(function(webMBlob) { + $("video").attr("src", URL.createObjectURL(webMBlob)); +}); +``` + +## Compatibility + +Because this code relies on browser support for encoding a Canvas as a WebP image (using `toDataURL()`), it is presently +only supported in Google Chrome. It will throw an exception on other browsers. + +## License + +This project is licensed under the WTFPLv2 https://en.wikipedia.org/wiki/WTFPL diff --git a/src/arraybufferdatastream.js b/src/arraybufferdatastream.js new file mode 100644 index 0000000..ca459fb --- /dev/null +++ b/src/arraybufferdatastream.js @@ -0,0 +1,205 @@ +/** + * A tool for presenting an ArrayBuffer as a stream for writing some simple data types. + * + * By Nicholas Sherlock + * + * Released under the WTFPLv2 https://en.wikipedia.org/wiki/WTFPL + */ + +"use strict"; + +var ArrayBufferDataStream; + +(function(){ + /* + * Create an ArrayBuffer of the given length and present it as a writable stream with methods + * for writing data in different formats. + */ + ArrayBufferDataStream = function(length) { + this.data = new Uint8Array(length); + this.pos = 0; + }; + + ArrayBufferDataStream.prototype.seek = function(offset) { + this.pos = offset; + }; + + ArrayBufferDataStream.prototype.writeBytes = function(arr) { + for (var i = 0; i < arr.length; i++) { + this.data[this.pos++] = arr[i]; + } + }; + + ArrayBufferDataStream.prototype.writeByte = function(b) { + this.data[this.pos++] = b; + }; + + //Synonym: + ArrayBufferDataStream.prototype.writeU8 = ArrayBufferDataStream.prototype.writeByte; + + ArrayBufferDataStream.prototype.writeU16BE = function(u) { + this.data[this.pos++] = u >> 8; + this.data[this.pos++] = u; + }; + + ArrayBufferDataStream.prototype.writeDoubleBE = function(d) { + var + bytes = new Uint8Array(new Float64Array([d]).buffer); + + for (var i = bytes.length - 1; i >= 0; i--) { + this.writeByte(bytes[i]); + } + }; + + ArrayBufferDataStream.prototype.writeFloatBE = function(d) { + var + bytes = new Uint8Array(new Float32Array([d]).buffer); + + for (var i = bytes.length - 1; i >= 0; i--) { + this.writeByte(bytes[i]); + } + }; + + /** + * Write an ASCII string to the stream + */ + ArrayBufferDataStream.prototype.writeString = function(s) { + for (var i = 0; i < s.length; i++) { + this.data[this.pos++] = s.charCodeAt(i); + } + }; + + /** + * Write the given 32-bit integer to the stream as an EBML variable-length integer using the given byte width + * (use measureEBMLVarInt). + * + * No error checking is performed to ensure that the supplied width is correct for the integer. + * + * @param i Integer to be written + * @param width Number of bytes to write to the stream + */ + ArrayBufferDataStream.prototype.writeEBMLVarIntWidth = function(i, width) { + switch (width) { + case 1: + this.writeU8((1 << 7) | i); + break; + case 2: + this.writeU8((1 << 6) | (i >> 8)); + this.writeU8(i); + break; + case 3: + this.writeU8((1 << 5) | (i >> 16)); + this.writeU8(i >> 8); + this.writeU8(i); + break; + case 4: + this.writeU8((1 << 4) | (i >> 24)); + this.writeU8(i >> 16); + this.writeU8(i >> 8); + this.writeU8(i); + break; + case 5: + /* + * JavaScript converts its doubles to 32-bit integers for bitwise operations, so we need to do a + * division by 2^32 instead of a right-shift of 32 to retain those top 3 bits + */ + this.writeU8((1 << 3) | ((i / 4294967296) & 0x7)); + this.writeU8(i >> 24); + this.writeU8(i >> 16); + this.writeU8(i >> 8); + this.writeU8(i); + break; + default: + throw new RuntimeException("Bad EBML VINT size " + width); + } + }; + + /** + * Return the number of bytes needed to encode the given integer as an EBML VINT. + */ + ArrayBufferDataStream.prototype.measureEBMLVarInt = function(val) { + if (val < (1 << 7) - 1) { + /* Top bit is set, leaving 7 bits to hold the integer, but we can't store 127 because + * "all bits set to one" is a reserved value. Same thing for the other cases below: + */ + return 1; + } else if (val < (1 << 14) - 1) { + return 2; + } else if (val < (1 << 21) - 1) { + return 3; + } else if (val < (1 << 28) - 1) { + return 4; + } else if (val < 34359738367) { // 2 ^ 35 - 1 (can address 32GB) + return 5; + } else { + throw new RuntimeException("EBML VINT size not supported " + val); + } + }; + + ArrayBufferDataStream.prototype.writeEBMLVarInt = function(i) { + this.writeEBMLVarIntWidth(i, this.measureEBMLVarInt(i)); + }; + + /** + * Write the given unsigned 32-bit integer to the stream in big-endian order using the given byte width. + * No error checking is performed to ensure that the supplied width is correct for the integer. + * + * Omit the width parameter to have it determined automatically for you. + * + * @param u Unsigned integer to be written + * @param width Number of bytes to write to the stream + */ + ArrayBufferDataStream.prototype.writeUnsignedIntBE = function(u, width) { + if (width === undefined) { + width = this.measureUnsignedInt(u); + } + + // Each case falls through: + switch (width) { + case 5: + this.writeU8(Math.floor(u / 4294967296)); // Need to use division to access >32 bits of floating point var + case 4: + this.writeU8(u >> 24); + case 3: + this.writeU8(u >> 16); + case 2: + this.writeU8(u >> 8); + case 1: + this.writeU8(u); + break; + default: + throw new RuntimeException("Bad UINT size " + width); + } + }; + + /** + * Return the number of bytes needed to hold the non-zero bits of the given unsigned integer. + */ + ArrayBufferDataStream.prototype.measureUnsignedInt = function(val) { + // Force to 32-bit unsigned integer + if (val < (1 << 8)) { + return 1; + } else if (val < (1 << 16)) { + return 2; + } else if (val < (1 << 24)) { + return 3; + } else if (val < 4294967296) { + return 4; + } else { + return 5; + } + }; + + /** + * Return a view on the portion of the buffer from the beginning to the current seek position as a Uint8Array. + */ + ArrayBufferDataStream.prototype.getAsDataArray = function() { + if (this.pos < this.data.byteLength) { + return this.data.subarray(0, this.pos); + } else if (this.pos == this.data.byteLength) { + return this.data; + } else { + throw "ArrayBufferDataStream's pos lies beyond end of buffer"; + } + }; +}()); \ No newline at end of file diff --git a/src/blobbuffer.js b/src/blobbuffer.js new file mode 100644 index 0000000..76516f8 --- /dev/null +++ b/src/blobbuffer.js @@ -0,0 +1,188 @@ +"use strict"; + +/** + * Allows a series of Blob-convertible objects (ArrayBuffer, Blob, String, etc) to be added to a buffer. Seeking and + * overwriting of blobs is allowed. + * + * You can supply a FileWriter, in which case the BlobBuffer is just used as temporary storage before it writes it + * through to the disk. + * + * By Nicholas Sherlock + * + * Released under the WTFPLv2 https://en.wikipedia.org/wiki/WTFPL + */ +function BlobBuffer(fileWriter) { + var + buffer = [], + writePromise = Promise.resolve(); + + // Current seek offset + this.pos = 0; + + // One more than the index of the highest byte ever written + this.length = 0; + + // Returns a promise that converts the blob to an ArrayBuffer + function readBlobAsBuffer(blob) { + return new Promise(function(resolve,reject) { + var + reader = new FileReader(); + + reader.addEventListener("loadend", function() { + resolve(reader.result); + }); + + reader.readAsArrayBuffer(blob); + }); + } + + function convertToUint8Array(thing) { + return new Promise(function(resolve, reject) { + if (thing instanceof Uint8Array) { + resolve(thing); + } else if (thing instanceof ArrayBuffer || ArrayBuffer.isView(thing)) { + resolve(new Uint8Array(thing)); + } else if (thing instanceof Blob) { + resolve(readBlobAsBuffer(thing).then(function(buffer) { + return new Uint8Array(buffer); + })); + } else { + //Assume that Blob will know how to read this thing + resolve(readBlobAsBuffer(new Blob([thing])).then(function(buffer) { + return new Uint8Array(buffer); + })); + } + }); + } + + function measureData(data) { + var + result = data.byteLength || data.length || data.size; + + if (!Number.isInteger(result)) { + throw "Failed to determine size of element"; + } + + return result; + } + + /** + * Seek to the given absolute offset. + * + * You may not seek beyond the end of the file (this would create a hole and/or allow blocks to be written in non- + * sequential order, which isn't currently supported by the memory buffer backend). + */ + this.seek = function(offset) { + if (offset < 0) { + throw "Offset may not be negative"; + } + + if (isNaN(offset)) { + throw "Offset may not be NaN"; + } + + if (offset > this.length) { + throw "Seeking beyond the end of file is not allowed"; + } + + this.pos = offset; + }; + + /** + * Write the Blob-convertible data to the buffer at the current seek position. + * + * Note: If overwriting existing data, the write must not cross preexisting block boundaries (written data must + * be fully contained by the extent of a previous write). + */ + this.write = function(data) { + var + newEntry = { + offset: this.pos, + data: data, + length: measureData(data) + }, + isAppend = newEntry.offset >= this.length; + + this.pos += newEntry.length; + this.length = Math.max(this.length, this.pos); + + // After previous writes complete, perform our write + writePromise = writePromise.then(function() { + if (fileWriter) { + return new Promise(function(resolve, reject) { + fileWriter.onwriteend = resolve; + + fileWriter.seek(newEntry.offset); + fileWriter.write(new Blob([newEntry.data])); + }); + } else if (!isAppend) { + // We might be modifying a write that was already buffered in memory. + + // Slow linear search to find a block we might be overwriting + for (var i = 0; i < buffer.length; i++) { + var + entry = buffer[i]; + + // If our new entry overlaps the old one in any way... + if (!(newEntry.offset + newEntry.length <= entry.offset || newEntry.offset >= entry.offset + entry.length)) { + if (newEntry.offset < entry.offset || newEntry.offset + newEntry.length > entry.offset + entry.length) { + throw new RuntimeException("Overwrite crosses blob boundaries"); + } + + if (newEntry.offset == entry.offset && newEntry.length == entry.length) { + // We overwrote the entire block + entry.data = newEntry.data; + + // We're done + return; + } else { + return convertToUint8Array(entry.data) + .then(function(entryArray) { + entry.data = entryArray; + + return convertToUint8Array(newEntry.data); + }).then(function(newEntryArray) { + newEntry.data = newEntryArray; + + entry.data.set(newEntry.data, newEntry.offset - entry.offset); + }); + } + } + } + // Else fall through to do a simple append, as we didn't overwrite any pre-existing blocks + } + + buffer.push(newEntry); + }); + }; + + /** + * Finish all writes to the buffer, returning a promise that signals when that is complete. + * + * If a FileWriter was not provided, the promise is resolved with a Blob that represents the completed BlobBuffer + * contents. You can optionally pass in a mimeType to be used for this blob. + * + * If a FileWriter was provided, the promise is resolved with null as the first argument. + */ + this.complete = function(mimeType) { + if (fileWriter) { + writePromise = writePromise.then(function() { + return null; + }); + } else { + // After writes complete we need to merge the buffer to give to the caller + writePromise = writePromise.then(function() { + var + result = []; + + for (var i = 0; i < buffer.length; i++) { + result.push(buffer[i].data); + } + + return new Blob(result, {mimeType:mimeType}); + }); + } + + return writePromise; + }; +} \ No newline at end of file diff --git a/src/webm-writer.js b/src/webm-writer.js new file mode 100644 index 0000000..9aad5ad --- /dev/null +++ b/src/webm-writer.js @@ -0,0 +1,662 @@ +/** + * WebM video encoder for Google Chrome. This implementation is suitable for creating very large video files, because + * it can stream Blobs directly to a FileWriter without buffering the entire video in memory. + * + * When FileWriter is not available or not desired, it can buffer the video in memory as a series of Blobs which are + * eventually returned as one composite Blob. + * + * By Nicholas Sherlock. + * + * Based on the ideas from Whammy: https://github.com/antimatter15/whammy + * + * Released under the WTFPLv2 https://en.wikipedia.org/wiki/WTFPL + */ + +"use strict"; + +var + WebMWriter; + +(function() { + function extend(base, top) { + var + target = {}; + + [base, top].forEach(function(obj) { + for (var prop in obj) { + if (Object.prototype.hasOwnProperty.call(obj, prop)) { + target[prop] = obj[prop]; + } + } + }); + + return target; + } + + /** + * Decode a Base64 data URL into a binary string. + * + * Returns the binary string, or false if the URL could not be decoded. + */ + function decodeBase64WebPDataURL(url) { + if (typeof url !== "string" || !url.match(/^data:image\/webp;base64,/i)) { + return false; + } + + return window.atob(url.substring("data:image\/webp;base64,".length)); + } + + /** + * Convert a raw binary string (one character = one output byte) to an ArrayBuffer + */ + function stringToArrayBuffer(string) { + var + buffer = new ArrayBuffer(string.length), + int8Array = new Uint8Array(buffer); + + for (var i = 0; i < string.length; i++) { + int8Array[i] = string.charCodeAt(i); + } + + return buffer; + } + + /** + * Convert the given canvas to a WebP encoded image and return the image data as a string. + */ + function renderAsWebP(canvas, quality) { + var + frame = canvas.toDataURL('image/webp', {quality: quality}); + + return decodeBase64WebPDataURL(frame); + } + + function extractKeyframeFromWebP(webP) { + // Assume that Chrome will generate a Simple Lossy WebP which has this header: + var + keyframeStartIndex = webP.indexOf('WEBPVP8 '); + + if (keyframeStartIndex == -1) { + throw "Failed to identify beginning of keyframe in WebP image"; + } + + // Skip the header and the 4 bytes that encode the length of the VP8 chunk + keyframeStartIndex += 'WEBPVP8 '.length + 4; + + return webP.substring(keyframeStartIndex); + } + + // Just a little utility so we can tag values as floats for the EBML encoder's benefit + function EBMLFloat32(value) { + this.value = value; + } + + function EBMLFloat64(value) { + this.value = value; + } + + /** + * Write the given EBML object to the provided ArrayBufferStream. + * + * The buffer's first byte is at bufferFileOffset inside the video file. This is used to complete offset and + * dataOffset fields in each EBML structure, indicating the file offset of the first byte of the EBML element and + * its data payload. + */ + function writeEBML(buffer, bufferFileOffset, ebml) { + // Is the ebml an array of sibling elements? + if (Array.isArray(ebml)) { + for (var i = 0; i < ebml.length; i++) { + writeEBML(buffer, bufferFileOffset, ebml[i]); + } + // Is this some sort of raw data that we want to write directly? + } else if (typeof ebml === "string") { + buffer.writeString(ebml); + } else if (ebml instanceof Uint8Array) { + buffer.writeBytes(ebml); + } else if (ebml.id){ + // We're writing an EBML element + ebml.offset = buffer.pos + bufferFileOffset; + + buffer.writeUnsignedIntBE(ebml.id); // ID field + + // Now we need to write the size field, so we must know the payload size: + + if (Array.isArray(ebml.data)) { + // Writing an array of child elements. We won't try to measure the size of the children up-front + + var + sizePos, dataBegin, dataEnd; + + if (ebml.size === -1) { + // Write the reserved all-one-bits marker to note that the size of this element is unknown/unbounded + buffer.writeByte(0xFF); + } else { + sizePos = buffer.pos; + + /* Write a dummy size field to overwrite later. 4 bytes allows an element maximum size of 256MB, + * which should be plenty (we don't want to have to buffer that much data in memory at one time + * anyway!) + */ + buffer.writeBytes([0, 0, 0, 0]); + } + + dataBegin = buffer.pos; + + ebml.dataOffset = dataBegin + bufferFileOffset; + writeEBML(buffer, bufferFileOffset, ebml.data); + + if (ebml.size !== -1) { + dataEnd = buffer.pos; + + ebml.size = dataEnd - dataBegin; + + buffer.seek(sizePos); + buffer.writeEBMLVarIntWidth(ebml.size, 4); // Size field + + buffer.seek(dataEnd); + } + } else if (typeof ebml.data === "string") { + buffer.writeEBMLVarInt(ebml.data.length); // Size field + ebml.dataOffset = buffer.pos + bufferFileOffset; + buffer.writeString(ebml.data); + } else if (typeof ebml.data === "number") { + // Allow the caller to explicitly choose the size if they wish by supplying a size field + if (!ebml.size) { + ebml.size = buffer.measureUnsignedInt(ebml.data); + } + + buffer.writeEBMLVarInt(ebml.size); // Size field + ebml.dataOffset = buffer.pos + bufferFileOffset; + buffer.writeUnsignedIntBE(ebml.data, ebml.size); + } else if (ebml.data instanceof EBMLFloat64) { + buffer.writeEBMLVarInt(8); // Size field + ebml.dataOffset = buffer.pos + bufferFileOffset; + buffer.writeDoubleBE(ebml.data.value); + } else if (ebml.data instanceof EBMLFloat32) { + buffer.writeEBMLVarInt(4); // Size field + ebml.dataOffset = buffer.pos + bufferFileOffset; + buffer.writeFloatBE(ebml.data.value); + } else if (ebml.data instanceof Uint8Array) { + buffer.writeEBMLVarInt(ebml.data.byteLength); // Size field + ebml.dataOffset = buffer.pos + bufferFileOffset; + buffer.writeBytes(ebml.data); + } else { + throw "Bad EBML datatype " + typeof ebml.data; + } + } else { + throw "Bad EBML datatype " + typeof ebml.data; + } + } + + WebMWriter = function(options) { + var + MAX_CLUSTER_DURATION_MSEC = 5000, + DEFAULT_TRACK_NUMBER = 1, + + writtenHeader = false, + videoWidth, videoHeight, + + clusterFrameBuffer = [], + clusterStartTime = 0, + clusterDuration = 0, + + optionDefaults = { + quality: 0.95, // WebM image quality from 0.0 (worst) to 1.0 (best) + fileWriter: null, // FileWriter in order to stream to a file instead of buffering to memory (optional) + + // You must supply one of: + frameDuration: null, // Duration of frames in milliseconds + frameRate: null, // Number of frames per second + }, + + seekPoints = { + Cues: {id: new Uint8Array([0x1C, 0x53, 0xBB, 0x6B]), positionEBML: null}, + SegmentInfo: {id: new Uint8Array([0x15, 0x49, 0xA9, 0x66]), positionEBML: null}, + Tracks: {id: new Uint8Array([0x16, 0x54, 0xAE, 0x6B]), positionEBML: null}, + }, + + ebmlSegment, + segmentDuration = { + "id": 0x4489, // Duration + "data": new EBMLFloat64(0) + }, + + seekHead, + + cues = [], + + blobBuffer = new BlobBuffer(options.fileWriter); + + function fileOffsetToSegmentRelative(fileOffset) { + return fileOffset - ebmlSegment.dataOffset; + } + + /** + * Create a SeekHead element with descriptors for the points in the global seekPoints array. + * + * 5 bytes of position values are reserved for each node, which lie at the offset point.positionEBML.dataOffset, + * to be overwritten later. + */ + function createSeekHead() { + var + seekPositionEBMLTemplate = { + "id": 0x53AC, // SeekPosition + "size": 5, // Allows for 32GB video files + "data": 0 // We'll overwrite this when the file is complete + }, + + result = { + "id": 0x114D9B74, // SeekHead + "data": [] + }; + + for (var name in seekPoints) { + var + seekPoint = seekPoints[name]; + + seekPoint.positionEBML = Object.create(seekPositionEBMLTemplate); + + result.data.push({ + "id": 0x4DBB, // Seek + "data": [ + { + "id": 0x53AB, // SeekID + "data": seekPoint.id + }, + seekPoint.positionEBML + ] + }); + } + + return result; + } + + /** + * Write the WebM file header to the stream. + */ + function writeHeader() { + seekHead = createSeekHead(); + + var + ebmlHeader = { + "id": 0x1a45dfa3, // EBML + "data": [ + { + "id": 0x4286, // EBMLVersion + "data": 1 + }, + { + "id": 0x42f7, // EBMLReadVersion + "data": 1 + }, + { + "id": 0x42f2, // EBMLMaxIDLength + "data": 4 + }, + { + "id": 0x42f3, // EBMLMaxSizeLength + "data": 8 + }, + { + "id": 0x4282, // DocType + "data": "webm" + }, + { + "id": 0x4287, // DocTypeVersion + "data": 2 + }, + { + "id": 0x4285, // DocTypeReadVersion + "data": 2 + } + ] + }, + + segmentInfo = { + "id": 0x1549a966, // Info + "data": [ + { + "id": 0x2ad7b1, // TimecodeScale + "data": 1e6 // Times will be in miliseconds (1e6 nanoseconds per step = 1ms) + }, + { + "id": 0x4d80, // MuxingApp + "data": "webm-writer-js", + }, + { + "id": 0x5741, // WritingApp + "data": "webm-writer-js" + }, + segmentDuration // To be filled in later + ] + }, + + tracks = { + "id": 0x1654ae6b, // Tracks + "data": [ + { + "id": 0xae, // TrackEntry + "data": [ + { + "id": 0xd7, // TrackNumber + "data": DEFAULT_TRACK_NUMBER + }, + { + "id": 0x73c5, // TrackUID + "data": DEFAULT_TRACK_NUMBER + }, + { + "id": 0x9c, // FlagLacing + "data": 0 + }, + { + "id": 0x22b59c, // Language + "data": "und" + }, + { + "id": 0x86, // CodecID + "data": "V_VP8" + }, + { + "id": 0x258688, // CodecName + "data": "VP8" + }, + { + "id": 0x83, // TrackType + "data": 1 + }, + { + "id": 0xe0, // Video + "data": [ + { + "id": 0xb0, // PixelWidth + "data": videoWidth + }, + { + "id": 0xba, // PixelHeight + "data": videoHeight + } + ] + } + ] + } + ] + }; + + ebmlSegment = { + "id": 0x18538067, // Segment + "size": -1, // Unbounded size + "data": [ + seekHead, + segmentInfo, + tracks, + ] + }; + + var + bufferStream = new ArrayBufferDataStream(256); + + writeEBML(bufferStream, blobBuffer.pos, [ebmlHeader, ebmlSegment]); + blobBuffer.write(bufferStream.getAsDataArray()); + + // Now we know where these top-level elements lie in the file: + seekPoints.SegmentInfo.positionEBML.data = fileOffsetToSegmentRelative(segmentInfo.offset); + seekPoints.Tracks.positionEBML.data = fileOffsetToSegmentRelative(tracks.offset); + }; + + /** + * Create a SimpleBlock keyframe header using these fields: + * timecode - Time of this keyframe + * trackNumber - Track number from 1 to 127 (inclusive) + * frame - Raw frame data payload string + * + * Returns an EBML element. + */ + function createKeyframeBlock(keyframe) { + var + bufferStream = new ArrayBufferDataStream(1 + 2 + 1); + + if (!(keyframe.trackNumber > 0 && keyframe.trackNumber < 127)) { + throw "TrackNumber must be > 0 and < 127"; + } + + bufferStream.writeEBMLVarInt(keyframe.trackNumber); // Always 1 byte since we limit the range of trackNumber + bufferStream.writeU16BE(keyframe.timecode); + + // Flags byte + bufferStream.writeByte( + 1 << 7 // Keyframe + ); + + return { + "id": 0xA3, // SimpleBlock + "data": [ + bufferStream.getAsDataArray(), + keyframe.frame + ] + }; + } + + /** + * Create a Cluster node using these fields: + * + * timecode - Start time for the cluster + * + * Returns an EBML element. + */ + function createCluster(cluster) { + return { + "id": 0x1f43b675, + "data": [ + { + "id": 0xe7, // Timecode + "data": Math.round(cluster.timecode), + } + ] + }; + } + + function addCuePoint(trackIndex, clusterTime, clusterFileOffset) { + cues.push({ + "id": 0xBB, // Cue + "data": [ + { + "id": 0xB3, // CueTime + "data": clusterTime + }, + { + "id": 0xB7, // CueTrackPositions + "data": [ + { + "id": 0xF7, // CueTrack + "data": trackIndex + }, + { + "id": 0xF1, // CueClusterPosition + "data": fileOffsetToSegmentRelative(clusterFileOffset) + } + ] + } + ] + }); + } + + /** + * Write a Cues element to the blobStream using the global `cues` array of CuePoints (use createCuePoint()). + * The seek entry for the Cues in the SeekHead is updated. + */ + function writeCues() { + var + ebml = { + "id": 0x1C53BB6B, + "data": cues + }, + + cuesBuffer = new ArrayBufferDataStream(16 + cues.length * 32); // Pretty crude estimate of the buffer size we'll need + + writeEBML(cuesBuffer, blobBuffer.pos, ebml); + blobBuffer.write(cuesBuffer.getAsDataArray()); + + // Now we know where the Cues element has ended up, we can update the SeekHead + seekPoints.Cues.positionEBML.data = fileOffsetToSegmentRelative(ebml.offset); + } + + /** + * Flush the frames in the current clusterFrameBuffer out to the stream as a Cluster. + */ + function flushClusterFrameBuffer() { + if (clusterFrameBuffer.length == 0) { + return; + } + + // First work out how large of a buffer we need to hold the cluster data + var + rawImageSize = 0; + + for (var i = 0; i < clusterFrameBuffer.length; i++) { + rawImageSize += clusterFrameBuffer[i].frame.length; + } + + var + buffer = new ArrayBufferDataStream(rawImageSize + clusterFrameBuffer.length * 32), // Estimate 32 bytes per SimpleBlock header + + cluster = createCluster({ + timecode: Math.round(clusterStartTime), + }), + + timecodeOffset = 0; + + for (var i = 0; i < clusterFrameBuffer.length; i++) { + var + block = createKeyframeBlock({ + trackNumber: DEFAULT_TRACK_NUMBER, + timecode: Math.round(timecodeOffset), + frame: clusterFrameBuffer[i].frame + }); + + cluster.data.push(block); + + timecodeOffset += clusterFrameBuffer[i].duration; + } + + writeEBML(buffer, blobBuffer.pos, cluster); + blobBuffer.write(buffer.getAsDataArray()); + + addCuePoint(DEFAULT_TRACK_NUMBER, Math.round(clusterStartTime), cluster.offset); + + clusterFrameBuffer = []; + clusterStartTime += clusterDuration; + clusterDuration = 0; + } + + function validateOptions() { + // Derive frameDuration setting if not already supplied + if (!options.frameDuration) { + if (options.frameRate) { + options.frameDuration = 1000 / options.frameRate; + } else { + throw "Missing required frameDuration or frameRate setting"; + } + } + } + + function addFrameToBuffer(frame) { + clusterFrameBuffer.push(frame); + clusterDuration += frame.duration; + + if (clusterDuration >= MAX_CLUSTER_DURATION_MSEC) { + flushClusterFrameBuffer(); + } + } + + /** + * Rewrites the SeekHead element that was initially written to the stream with the offsets of top level elements. + * + * Call once writing is complete (so the offset of all top level elements is known). + */ + function rewriteSeekHead() { + var + seekHeadBuffer = new ArrayBufferDataStream(seekHead.size), + oldPos = blobBuffer.pos; + + // Write the rewritten SeekHead element's data payload to the stream (don't need to update the id or size) + writeEBML(seekHeadBuffer, seekHead.dataOffset, seekHead.data); + + // And write that through to the file + blobBuffer.seek(seekHead.dataOffset); + blobBuffer.write(seekHeadBuffer.getAsDataArray()); + + blobBuffer.seek(oldPos); + } + + /** + * Rewrite the Duration field of the Segment with the newly-discovered video duration. + */ + function rewriteDuration() { + var + buffer = new ArrayBufferDataStream(8), + oldPos = blobBuffer.pos; + + // Rewrite the data payload (don't need to update the id or size) + buffer.writeDoubleBE(clusterStartTime); + + // And write that through to the file + blobBuffer.seek(segmentDuration.dataOffset); + blobBuffer.write(buffer.getAsDataArray()); + + blobBuffer.seek(oldPos); + } + + /** + * Add a frame to the video. Currently the frame must be a Canvas element. + */ + this.addFrame = function(canvas) { + if (writtenHeader) { + if (canvas.width != videoWidth || canvas.height != videoHeight) { + throw "Frame size differs from previous frames"; + } + } else { + videoWidth = canvas.width; + videoHeight = canvas.height; + + writeHeader(); + writtenHeader = true; + } + + var + webP = renderAsWebP(canvas, {quality: options.quality}); + + if (!webP) { + throw "Couldn't decode WebP frame, does the browser support WebP?"; + } + + addFrameToBuffer({ + frame: extractKeyframeFromWebP(webP), + duration: options.frameDuration + }); + }; + + /** + * Finish writing the video and return a Promise to signal completion. + * + * If the destination device was memory (i.e. options.fileWriter was not supplied), the Promise is resolved with + * a Blob with the contents of the entire video. + */ + this.complete = function() { + flushClusterFrameBuffer(); + + writeCues(); + rewriteSeekHead(); + rewriteDuration(); + + return blobBuffer.complete('video/webm'); + }; + + this.getWrittenSize = function() { + return blobBuffer.length; + }; + + options = extend(optionDefaults, options || {}); + validateOptions(); + } +})(); \ No newline at end of file diff --git a/test/arraybufferdatastream/test.html b/test/arraybufferdatastream/test.html new file mode 100644 index 0000000..fba721e --- /dev/null +++ b/test/arraybufferdatastream/test.html @@ -0,0 +1,13 @@ + + + + + Video writer test + + + + + +

Testing ArrayBufferDataStream

+ + \ No newline at end of file diff --git a/test/arraybufferdatastream/test.js b/test/arraybufferdatastream/test.js new file mode 100644 index 0000000..7626651 --- /dev/null +++ b/test/arraybufferdatastream/test.js @@ -0,0 +1,124 @@ +function assert(test, message) { + $("body").append((test ? "Pass" : "Fail" ) + " - " + message + "
"); +} + +// Returns a promise that converts the blob to a string +function readBlobAsString(blob) { + return new Promise(function(resolve,reject) { + var + reader = new FileReader(); + + reader.addEventListener("loadend", function() { + resolve(reader.result); + }); + + reader.readAsBinaryString(blob); + }); +} + +function testEBMLVarInt() { + var + tests = [ + {input: 0, output:[0x80]}, + {input: 1, output:[0x81]}, + {input: 2, output:[0x82]}, + {input: 126, output:[0xFE]}, + {input: 127, output:[0x40, 0x7F]}, // We avoid storing all-bits-one because it's a reserved encoding for Size field varints + {input: 128, output:[0x40, 0x80]}, + {input: 16382, output:[0x7F, 0xFE]}, + {input: 16383, output:[0x20, 0x3F, 0xFF]}, + {input: 16384, output:[0x20, 0x40, 0x00]}, + {input: 2097150, output:[0x3F, 0xFF, 0xFE]}, + {input: 2097151, output:[0x10, 0x1F, 0xFF, 0xFF]}, + {input: 2097152, output:[0x10, 0x20, 0x00, 0x00]}, + {input: 268435454, output:[0x1F, 0xFF, 0xFF, 0xFE]}, + {input: 268435455, output:[0x08, 0x0F, 0xFF, 0xFF, 0xFF]}, + {input: 268435456, output:[0x08, 0x10, 0x00, 0x00, 0x00]}, + {input: 34359738366, output:[0x0F, 0xFF, 0xFF, 0xFF, 0xFE]}, + ], + arrayBuffer = new ArrayBufferDataStream(5), + allPass = true; + + for (var i = 0; i < tests.length; i++) { + var + test = tests[i]; + + arrayBuffer.pos = 0; + + arrayBuffer.writeEBMLVarInt(test.input); + + if (arrayBuffer.pos != test.output.length) { + allPass = false; + assert(false, "EBML VarInt encoding of " + test.input + " has wrong length " + arrayBuffer.pos + " (expected " + test.output.length + ")"); + } else { + var + encoded = arrayBuffer.getAsDataArray(); + + for (var j = 0; j < test.output.length; j++) { + if (encoded[j] != test.output[j]) { + allPass = false; + assert(false, "EBML VarInt encoding of " + test.input + " is wrong: " + Array.prototype.join.call(encoded, ",") + " (expected " + test.output + ")"); + break; + } + } + } + } + + assert(allPass, "EBML VarInt tests"); +} + +function testUnsignedIntBE() { + var + tests = [ + {input: 0, output:[0x00]}, + {input: 1, output:[0x01]}, + {input: 2, output:[0x02]}, + {input: 254, output:[0xFE]}, + {input: 255, output:[0xFF]}, + {input: 256, output:[0x01, 00]}, + {input: 65534, output:[0xFF, 0xFE]}, + {input: 65535, output:[0xFF, 0xFF]}, + {input: 65536, output:[0x01, 0x00, 0x00]}, + {input: 16777214, output:[0xFF, 0xFF, 0xFE]}, + {input: 16777215, output:[0xFF, 0xFF, 0xFF]}, + {input: 16777216, output:[0x01, 0x00, 0x00, 0x00]}, + {input: 4294967294, output:[0xFF, 0xFF, 0xFF, 0xFE]}, + {input: 4294967295, output:[0xFF, 0xFF, 0xFF, 0xFF]}, + {input: 4294967296, output:[0x01, 0x00, 0x00, 0x00, 0x00]}, + {input: 1099511627775, output:[0xFF, 0xFF, 0xFF, 0xFF, 0xFF]}, + ], + arrayBuffer = new ArrayBufferDataStream(5), + allPass = true; + + for (var i = 0; i < tests.length; i++) { + var + test = tests[i]; + + arrayBuffer.pos = 0; + + arrayBuffer.writeUnsignedIntBE(test.input); + + if (arrayBuffer.pos != test.output.length) { + allPass = false; + assert(false, "UnsignedIntBE encoding of " + test.input + " has wrong length " + arrayBuffer.pos + " (expected " + test.output.length + ")"); + } else { + var + encoded = arrayBuffer.getAsDataArray(); + + for (var j = 0; j < test.output.length; j++) { + if (encoded[j] != test.output[j]) { + allPass = false; + assert(false, "UnsignedIntBE encoding of " + test.input + " is wrong: " + Array.prototype.join.call(encoded, ",") + " (expected " + test.output + ")"); + break; + } + } + } + } + + assert(allPass, "UnsignedIntBE tests"); +} + +$(document).ready(function() { + testEBMLVarInt(); + testUnsignedIntBE(); +}); \ No newline at end of file diff --git a/test/blobbuffer/test-memory.html b/test/blobbuffer/test-memory.html new file mode 100644 index 0000000..56b30c6 --- /dev/null +++ b/test/blobbuffer/test-memory.html @@ -0,0 +1,13 @@ + + + + + Video writer test + + + + + +

Testing BlobBuffer where target is a memory Blob

+ + \ No newline at end of file diff --git a/test/blobbuffer/test-memory.js b/test/blobbuffer/test-memory.js new file mode 100644 index 0000000..8b9a998 --- /dev/null +++ b/test/blobbuffer/test-memory.js @@ -0,0 +1,89 @@ +function assert(test, message) { + $("body").append((test ? "Pass" : "Fail" ) + " - " + message + "
"); +} + +// Returns a promise that converts the blob to a string +function readBlobAsString(blob) { + return new Promise(function(resolve,reject) { + var + reader = new FileReader(); + + reader.addEventListener("loadend", function() { + resolve(reader.result); + }); + + reader.readAsBinaryString(blob); + }); +} + +$(document).ready(function() { + var + blobBuffer = new BlobBuffer(); + + assert(blobBuffer.pos == 0, "Initial pos correct"); + + blobBuffer.write(new Blob(["Hello, "])); + + assert(blobBuffer.pos == 7, "Pos advance correctly (Blob)"); + + blobBuffer.write("world"); + + assert(blobBuffer.pos == 12, "Pos advance correctly (String)"); + + var + arr = new Uint8Array(2); + + arr[0] = '?'.charCodeAt(0); + arr[1] = '!'.charCodeAt(0); + + blobBuffer.write(arr); + + assert(blobBuffer.pos == 14, "Pos advance correctly (Uint8Array)"); + + blobBuffer.write(arr.buffer); + + assert(blobBuffer.pos == 16, "Pos advance correctly (ArrayBuffer)"); + assert(blobBuffer.length == 16, "Length property correct"); + + blobBuffer.complete().then(function(blob) { + assert(blob.size == blobBuffer.pos, "Blob size correct"); + + return readBlobAsString(blob); + }).then(function(string) { + assert(string == "Hello, world?!?!", "Resulting blob correct"); + + blobBuffer.seek(2); + blobBuffer.write("-man"); + + assert(blobBuffer.length == 16, "Buffer 'length' field unchanged after overwrite"); + + return blobBuffer.complete(); + }).then(function(blob) { + assert(blob.size == 16, "Blob size unchanged after overwrite"); + + return readBlobAsString(blob); + }).then(function(string) { + assert(string == "He-man world?!?!", "Overwritten data correct"); + + blobBuffer.seek(blobBuffer.length); + + var + arrBuffer = new ArrayBuffer(10), + array = new Uint8Array(arrBuffer, 1, 4), + message = " Hi."; + + for (var i = 0 ; i < 4; i++) { + array[i] = message.charCodeAt(i); + } + + blobBuffer.write(array); + + return blobBuffer.complete(); + }).then(function(blob) { + assert(blob.size == 20, "Writing a Uint8Array which is smaller than its parent ArrayBuffer uses the correct size"); + + return readBlobAsString(blob); + }).then(function(string) { + assert(string == "He-man world?!?! Hi.", "Written data correct"); + }); +}); \ No newline at end of file diff --git a/test/videowriter/FileSaver.js b/test/videowriter/FileSaver.js new file mode 100644 index 0000000..599d149 --- /dev/null +++ b/test/videowriter/FileSaver.js @@ -0,0 +1,216 @@ +/* FileSaver.js + * A saveAs() FileSaver implementation. + * 2013-01-23 + * + * By Eli Grey, http://eligrey.com + * License: X11/MIT + * See LICENSE.md + */ + +/*global self */ +/*jslint bitwise: true, regexp: true, confusion: true, es5: true, vars: true, white: true, + plusplus: true */ + +/*! @source http://purl.eligrey.com/github/FileSaver.js/blob/master/FileSaver.js */ + +var saveAs = saveAs + || (navigator.msSaveOrOpenBlob && navigator.msSaveOrOpenBlob.bind(navigator)) + || (function(view) { + "use strict"; + var + doc = view.document + // only get URL when necessary in case BlobBuilder.js hasn't overridden it yet + , get_URL = function() { + return view.URL || view.webkitURL || view; + } + , URL = view.URL || view.webkitURL || view + , save_link = doc.createElementNS("http://www.w3.org/1999/xhtml", "a") + , can_use_save_link = !view.externalHost && "download" in save_link + , click = function(node) { + var event = doc.createEvent("MouseEvents"); + event.initMouseEvent( + "click", true, false, view, 0, 0, 0, 0, 0 + , false, false, false, false, 0, null + ); + node.dispatchEvent(event); + } + , webkit_req_fs = view.webkitRequestFileSystem + , req_fs = view.requestFileSystem || webkit_req_fs || view.mozRequestFileSystem + , throw_outside = function (ex) { + (view.setImmediate || view.setTimeout)(function() { + throw ex; + }, 0); + } + , force_saveable_type = "application/octet-stream" + , fs_min_size = 0 + , deletion_queue = [] + , process_deletion_queue = function() { + var i = deletion_queue.length; + while (i--) { + var file = deletion_queue[i]; + if (typeof file === "string") { // file is an object URL + URL.revokeObjectURL(file); + } else { // file is a File + file.remove(); + } + } + deletion_queue.length = 0; // clear queue + } + , dispatch = function(filesaver, event_types, event) { + event_types = [].concat(event_types); + var i = event_types.length; + while (i--) { + var listener = filesaver["on" + event_types[i]]; + if (typeof listener === "function") { + try { + listener.call(filesaver, event || filesaver); + } catch (ex) { + throw_outside(ex); + } + } + } + } + , FileSaver = function(blob, name) { + // First try a.download, then web filesystem, then object URLs + var + filesaver = this + , type = blob.type + , blob_changed = false + , object_url + , target_view + , get_object_url = function() { + var object_url = get_URL().createObjectURL(blob); + deletion_queue.push(object_url); + return object_url; + } + , dispatch_all = function() { + dispatch(filesaver, "writestart progress write writeend".split(" ")); + } + // on any filesys errors revert to saving with object URLs + , fs_error = function() { + // don't create more object URLs than needed + if (blob_changed || !object_url) { + object_url = get_object_url(blob); + } + if (target_view) { + target_view.location.href = object_url; + } else { + window.open(object_url, "_blank"); + } + filesaver.readyState = filesaver.DONE; + dispatch_all(); + } + , abortable = function(func) { + return function() { + if (filesaver.readyState !== filesaver.DONE) { + return func.apply(this, arguments); + } + }; + } + , create_if_not_found = {create: true, exclusive: false} + , slice + ; + filesaver.readyState = filesaver.INIT; + if (!name) { + name = "download"; + } + if (can_use_save_link) { + object_url = get_object_url(blob); + save_link.href = object_url; + save_link.download = name; + click(save_link); + filesaver.readyState = filesaver.DONE; + dispatch_all(); + return; + } + // Object and web filesystem URLs have a problem saving in Google Chrome when + // viewed in a tab, so I force save with application/octet-stream + // http://code.google.com/p/chromium/issues/detail?id=91158 + if (view.chrome && type && type !== force_saveable_type) { + slice = blob.slice || blob.webkitSlice; + blob = slice.call(blob, 0, blob.size, force_saveable_type); + blob_changed = true; + } + // Since I can't be sure that the guessed media type will trigger a download + // in WebKit, I append .download to the filename. + // https://bugs.webkit.org/show_bug.cgi?id=65440 + if (webkit_req_fs && name !== "download") { + name += ".download"; + } + if (type === force_saveable_type || webkit_req_fs) { + target_view = view; + } + if (!req_fs) { + fs_error(); + return; + } + fs_min_size += blob.size; + req_fs(view.TEMPORARY, fs_min_size, abortable(function(fs) { + fs.root.getDirectory("saved", create_if_not_found, abortable(function(dir) { + var save = function() { + dir.getFile(name, create_if_not_found, abortable(function(file) { + file.createWriter(abortable(function(writer) { + writer.onwriteend = function(event) { + target_view.location.href = file.toURL(); + deletion_queue.push(file); + filesaver.readyState = filesaver.DONE; + dispatch(filesaver, "writeend", event); + }; + writer.onerror = function() { + var error = writer.error; + if (error.code !== error.ABORT_ERR) { + fs_error(); + } + }; + "writestart progress write abort".split(" ").forEach(function(event) { + writer["on" + event] = filesaver["on" + event]; + }); + writer.write(blob); + filesaver.abort = function() { + writer.abort(); + filesaver.readyState = filesaver.DONE; + }; + filesaver.readyState = filesaver.WRITING; + }), fs_error); + }), fs_error); + }; + dir.getFile(name, {create: false}, abortable(function(file) { + // delete file if it already exists + file.remove(); + save(); + }), abortable(function(ex) { + if (ex.code === ex.NOT_FOUND_ERR) { + save(); + } else { + fs_error(); + } + })); + }), fs_error); + }), fs_error); + } + , FS_proto = FileSaver.prototype + , saveAs = function(blob, name) { + return new FileSaver(blob, name); + } + ; + FS_proto.abort = function() { + var filesaver = this; + filesaver.readyState = filesaver.DONE; + dispatch(filesaver, "abort"); + }; + FS_proto.readyState = FS_proto.INIT = 0; + FS_proto.WRITING = 1; + FS_proto.DONE = 2; + + FS_proto.error = + FS_proto.onwritestart = + FS_proto.onprogress = + FS_proto.onwrite = + FS_proto.onabort = + FS_proto.onerror = + FS_proto.onwriteend = + null; + + view.addEventListener("unload", process_deletion_queue, false); + return saveAs; +}(self)); diff --git a/test/videowriter/background.js b/test/videowriter/background.js new file mode 100644 index 0000000..a6f10c7 --- /dev/null +++ b/test/videowriter/background.js @@ -0,0 +1,8 @@ +chrome.app.runtime.onLaunched.addListener(function() { + chrome.app.window.create('test.html', { + 'innerBounds' : { + 'width' : 1100, + 'height' : 600 + } + }); +}); \ No newline at end of file diff --git a/test/videowriter/jquery-1.11.3.min.js b/test/videowriter/jquery-1.11.3.min.js new file mode 100644 index 0000000..0f60b7b --- /dev/null +++ b/test/videowriter/jquery-1.11.3.min.js @@ -0,0 +1,5 @@ +/*! jQuery v1.11.3 | (c) 2005, 2015 jQuery Foundation, Inc. | jquery.org/license */ +!function(a,b){"object"==typeof module&&"object"==typeof module.exports?module.exports=a.document?b(a,!0):function(a){if(!a.document)throw new Error("jQuery requires a window with a document");return b(a)}:b(a)}("undefined"!=typeof window?window:this,function(a,b){var c=[],d=c.slice,e=c.concat,f=c.push,g=c.indexOf,h={},i=h.toString,j=h.hasOwnProperty,k={},l="1.11.3",m=function(a,b){return new m.fn.init(a,b)},n=/^[\s\uFEFF\xA0]+|[\s\uFEFF\xA0]+$/g,o=/^-ms-/,p=/-([\da-z])/gi,q=function(a,b){return b.toUpperCase()};m.fn=m.prototype={jquery:l,constructor:m,selector:"",length:0,toArray:function(){return d.call(this)},get:function(a){return null!=a?0>a?this[a+this.length]:this[a]:d.call(this)},pushStack:function(a){var b=m.merge(this.constructor(),a);return b.prevObject=this,b.context=this.context,b},each:function(a,b){return m.each(this,a,b)},map:function(a){return this.pushStack(m.map(this,function(b,c){return 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