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post.js
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post.js
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// libmp3lame function wrappers
var BUFSIZE = 8192;
return {
STEREO: 0,
JOINT_STEREO: 1,
MONO: 3,
get_version: Module.cwrap('get_lame_version', 'string'),
init: Module.cwrap('lame_init', 'number'),
init_params: Module.cwrap('lame_init_params', 'number', [ 'number' ]),
set_mode: Module.cwrap('lame_set_mode', 'number', [ 'number', 'number' ]),
get_mode: Module.cwrap('lame_get_mode', 'number', [ 'number' ]),
set_num_samples: Module.cwrap('lame_set_num_samples', 'number', [ 'number', 'number' ]),
get_num_samples: Module.cwrap('lame_get_num_samples', 'number', [ 'number' ]),
set_num_channels: Module.cwrap('lame_set_num_channels', 'number', [ 'number', 'number' ]),
get_num_channels: Module.cwrap('lame_get_num_channels', 'number', [ 'number' ]),
set_in_samplerate: Module.cwrap('lame_set_in_samplerate', 'number', [ 'number', 'number' ]),
get_in_samplerate: Module.cwrap('lame_get_in_samplerate', 'number', [ 'number' ]),
set_out_samplerate: Module.cwrap('lame_set_out_samplerate', 'number', [ 'number', 'number' ]),
get_out_samplerate: Module.cwrap('lame_get_out_samplerate', 'number', [ 'number' ]),
set_bitrate: Module.cwrap('lame_set_brate', 'number', [ 'number', 'number' ]),
get_bitrate: Module.cwrap('lame_get_brate', 'number', [ 'number' ]),
set_VBR: Module.cwrap('lame_set_VBR', 'number', [ 'number', 'number' ]),
get_VBR: Module.cwrap('lame_get_VBR', 'number', [ 'number' ]),
set_VBR_q: Module.cwrap('lame_set_VBR_q', 'number', [ 'number', 'number' ]),
get_VBR_q: Module.cwrap('lame_get_VBR_q', 'number', [ 'number' ]),
set_VBR_mean_bitrate_kbps: Module.cwrap('lame_set_VBR_mean_bitrate_kbps', 'number', [ 'number', 'number' ]),
get_VBR_mean_bitrate_kbps: Module.cwrap('lame_get_VBR_mean_bitrate_kbps', 'number', [ 'number' ]),
set_VBR_min_bitrate_kbps: Module.cwrap('lame_set_VBR_min_bitrate_kbps', 'number', [ 'number', 'number' ]),
get_VBR_min_bitrate_kbps: Module.cwrap('lame_get_VBR_min_bitrate_kbps', 'number', [ 'number' ]),
set_VBR_max_bitrate_kbps: Module.cwrap('lame_set_VBR_max_bitrate_kbps', 'number', [ 'number', 'number' ]),
get_VBR_max_bitrate_kbps: Module.cwrap('lame_get_VBR_max_bitrate_kbps', 'number', [ 'number' ]),
encode_buffer_ieee_float: function(handle, channel_l, channel_r) {
var outbuf = _malloc(BUFSIZE);
var inbuf_l = _malloc(channel_l.length * 4);
var inbuf_r = _malloc(channel_r.length * 4);
for (var i=0;i<channel_l.length;i++) {
setValue(inbuf_l + (i*4), channel_l[i], 'float');
}
for (var i=0;i<channel_r.length;i++) {
setValue(inbuf_r + (i*4), channel_r[i], 'float');
}
var nread = Module.ccall('lame_encode_buffer_ieee_float', 'number', [ 'number', 'number', 'number', 'number', 'number', 'number' ], [ handle, inbuf_l, inbuf_r, channel_l.length, outbuf, BUFSIZE ]);
var arraybuf = new ArrayBuffer(nread);
var retdata = new Uint8Array(arraybuf);
retdata.set(HEAPU8.subarray(outbuf, outbuf + nread));
_free(outbuf);
_free(inbuf_l);
_free(inbuf_r);
return { size: nread, data: retdata };
},
encode_flush: function(handle) {
var outbuf = _malloc(BUFSIZE);
var nread = Module.ccall('lame_encode_flush', 'number', [ 'number', 'number', 'number' ], [ handle, outbuf, BUFSIZE ]);
var arraybuf = new ArrayBuffer(nread);
var retdata = new Uint8Array(arraybuf);
retdata.set(HEAPU8.subarray(outbuf, outbuf + nread));
_free(outbuf);
return { size: nread, data: retdata };
},
close: Module.cwrap('lame_close', 'number', [ 'number' ])
};
})();
self.Lame = Lame; // make Lame accessible to other webworker scripts.