ref: 698250ec631d0a54932dab5a5b5b61995c42222b
dir: /js/h264bsd.js/
//
// Copyright (c) 2013 Sam Leitch. All rights reserved.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to
// deal in the Software without restriction, including without limitation the
// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
// sell copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
// IN THE SOFTWARE.
//
/*
* This class wraps the details of the h264bsd library.
*/
function H264Decoder(Module) {
H264Decoder.Module = Module;
H264Decoder.released = false;
H264Decoder.pStorage = H264Decoder.h264bsdAlloc();
H264Decoder.h264bsdInit(this.Module, this.pStorage, 0);
}
H264Decoder.RDY = 0;
H264Decoder.PIC_RDY = 1;
H264Decoder.HDRS_RDY = 2;
H264Decoder.ERROR = 3;
H264Decoder.PARAM_SET_ERROR = 4;
H264Decoder.MEMALLOC_ERROR = 5;
H264Decoder.Module = null;
H264Decoder.released = false;
H264Decoder.pStorage = null;
H264Decoder.prototype.release = function() {
if(this.released) return;
this.released = true;
H264Decoder.h264bsdShutdown(this.Module, this.pStorage);
H264Decoder.h264bsdFree(this.Module, this.pStorage);
}
H264Decoder.prototype.decode = function(data) {
if(data === undefined || !(data instanceof ArrayBuffer)) {
throw new Error("data must be a ArrayBuffer instance")
}
data = new Uint8Array(data);
var pData = 0; //The offset into the heap when decoding
var pAlloced = 0; //The original pointer to the data buffer (for freeing)
var pBytesRead = 0; //Pointer to bytesRead
var length = data.byteLength; //The byte-wise length of the data to decode
var bytesRead = 0; //The number of bytes read from a decode operation
var retCode = 0; //Return code from a decode operation
var lastPicId = 0; //ID of the last picture decoded
//Get a pointer into the heap were our decoded bytes will live
pData = pAlloced = H264Decoder.malloc(H264Decoder.Module, length);
H264Decoder.Module.HEAPU8.set(data, pData);
//get a pointer to where bytesRead will be stored: Uint32 = 4 bytes
pBytesRead = H264Decoder.malloc(H264Decoder.Module, 4);
//Keep decoding frames while there is still something to decode
while(length > 0) {
console.log('pStorage: ', H264Decoder.pStorage, ' pData: ', pData, ' byteLength: ', data.byteLength, ' lastPicId: ', lastPicId);
retCode = H264Decoder.h264bsdDecode(H264Decoder.Module, H264Decoder.pStorage, pData, data.byteLength, lastPicId, pBytesRead);
bytesRead = H264Decoder.Module.getValue(pBytesRead, 'i32')
console.log('Ret: ' , retCode, ' bytesRead: ', bytesRead);
length = length - bytesRead;
pData = pData + bytesRead;
console.log('Length: ', length);
}
if(pAlloced != 0) {
H264Decoder.free(H264Decoder.Module, pAlloced);
}
if(pBytesRead != 0) {
H264Decoder.free(H264Decoder.Module, pBytesRead);
}
}
// u32 h264bsdDecode(storage_t *pStorage, u8 *byteStrm, u32 len, u32 picId, u32 *readBytes);
H264Decoder.h264bsdDecode = function(Module, pStorage, pBytes, len, picId, pBytesRead) {
return H264Decoder.Module.ccall('h264bsdDecode', Number,
[Number, Number, Number, Number, Number],
[pStorage, pBytes, len, picId, pBytesRead]);
}
// storage_t* h264bsdAlloc();
H264Decoder.h264bsdAlloc = function(Module) {
return H264Decoder.Module.ccall('h264bsdAlloc', Number);
}
// void h264bsdFree(storage_t *pStorage);
H264Decoder.h264bsdFree = function(Module, pStorage) {
H264Decoder.Module.ccall('h264bsdFree', null, [Number], [pStorage]);
}
// u32 h264bsdInit(storage_t *pStorage, u32 noOutputReordering);
H264Decoder.h264bsdInit = function(Module, pStorage, noOutputReordering) {
return H264Decoder.Module.ccall('h264bsdInit', Number, [Number, Number], [pStorage, noOutputReordering]);
}
//void h264bsdShutdown(storage_t *pStorage);
H264Decoder.h264bsdShutdown = function(Module, pStorage) {
H264Decoder.Module.ccall('h264bsdShutdown', null, [Number], [pStorage]);
}
// u8* h264bsdNextOutputPicture(storage_t *pStorage, u32 *picId, u32 *isIdrPic, u32 *numErrMbs);
H264Decoder.h264bsdNextOutputPicture = function(Module, pStorage, pPicId, pIsIdrPic, pNumErrMbs) {
return H264Decoder.Module.ccall('h264bsdNextOutputPicture',
Number,
[Number, Number, Number, Number],
[pStorage, pPicId, pIsIdrPic, pNumErrMbs]);
}
// u32 h264bsdPicWidth(storage_t *pStorage);
H264Decoder.h264bsdPicWidth = function(Module, pStorage) {
return H264Decoder.Module.ccall('h264bsdPicWidth', Number, [Number], [pStorage]);
}
// u32 h264bsdPicHeight(storage_t *pStorage);
H264Decoder.h264bsdPicHeight = function(Module, pStorage) {
return H264Decoder.Module.ccall('h264bsdPicHeight', Number, [Number], [pStorage]);
}
// void h264bsdCroppingParams(storage_t *pStorage, u32 *croppingFlag, u32 *left, u32 *width, u32 *top, u32 *height);
H264Decoder.h264bsdCroppingParams = function(Module, pStorage, pCroppingFlag, pLeft, pWidth, pTop, pHeight) {
return H264Decoder.Module.ccall('h264bsdCroppingParams',
Number,
[Number, Number, Number, Number, Number, Number, Number],
[pStorage, pCroppingFlag, pLeft, pWidth, pTop, pHeight]);
}
// u32 h264bsdCheckValidParamSets(storage_t *pStorage);
H264Decoder.h264bsdCheckValidParamSets = function(Module, pStorage){
return H264Decoder.Module.ccall('h264bsdCheckValidParamSets', Number, [Number], [pStorage]);
}
// void* malloc(size_t size);
H264Decoder.malloc = function(Module, size){
return H264Decoder.Module.ccall('malloc', Number, [Number], [size]);
}
// void free(void* ptr);
H264Decoder.free = function(Module, ptr){
return H264Decoder.Module.ccall('free', null, [Number], [ptr]);
}
// void* memcpy(void* dest, void* src, size_t size);
H264Decoder.memcpy = function(Module, length){
return H264Decoder.Module.ccall('malloc', Number, [Number, Number, Number], [dest, src, size]);
}