exp-golomb.test.js
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/*
======== A Handy Little QUnit Reference ========
http://api.qunitjs.com/
Test methods:
module(name, {[setup][ ,teardown]})
test(name, callback)
expect(numberOfAssertions)
stop(increment)
start(decrement)
Test assertions:
assert.ok(value, [message])
assert.equal(actual, expected, [message])
assert.notEqual(actual, expected, [message])
assert.deepEqual(actual, expected, [message])
assert.notDeepEqual(actual, expected, [message])
assert.strictEqual(actual, expected, [message])
assert.notStrictEqual(actual, expected, [message])
assert.throws(block, [expected], [message])
*/
var
buffer,
ExpGolomb = require('../lib/utils/exp-golomb'),
expGolomb;
QUnit.module('Exponential Golomb coding');
QUnit.test('small numbers are coded correctly', function(assert) {
var
expected = [
[0xF8, 0],
[0x5F, 1],
[0x7F, 2],
[0x27, 3],
[0x2F, 4],
[0x37, 5],
[0x3F, 6],
[0x11, 7],
[0x13, 8],
[0x15, 9]
],
i = expected.length,
result;
while (i--) {
buffer = new Uint8Array([expected[i][0]]);
expGolomb = new ExpGolomb(buffer);
result = expGolomb.readUnsignedExpGolomb();
assert.equal(expected[i][1], result, expected[i][0] + ' is decoded to ' + expected[i][1]);
}
});
QUnit.test('drops working data as it is parsed', function(assert) {
var expGolomb = new ExpGolomb(new Uint8Array([0x00, 0xFF]));
expGolomb.skipBits(8);
assert.equal(8, expGolomb.bitsAvailable(), '8 bits remain');
assert.equal(0xFF, expGolomb.readBits(8), 'the second byte is read');
});
QUnit.test('drops working data when skipping leading zeros', function(assert) {
var expGolomb = new ExpGolomb(new Uint8Array([0x00, 0x00, 0x00, 0x00, 0xFF]));
assert.equal(32, expGolomb.skipLeadingZeros(), '32 leading zeros are dropped');
assert.equal(8, expGolomb.bitsAvailable(), '8 bits remain');
assert.equal(0xFF, expGolomb.readBits(8), 'the second byte is read');
});
QUnit.test('drops working data when skipping leading zeros', function(assert) {
var expGolomb = new ExpGolomb(new Uint8Array([0x15, 0xab, 0x40, 0xc8, 0xFF]));
assert.equal(3, expGolomb.skipLeadingZeros(), '3 leading zeros are dropped');
assert.equal((8 * 4) + 5, expGolomb.bitsAvailable(), '37 bits remain');
expGolomb.skipBits(1);
assert.equal(0x5a, expGolomb.readBits(8), 'the next bits are read');
});
QUnit.test('skipBits correctly across word-boundaries', function(assert) {
var expGolomb = new ExpGolomb(new Uint8Array([0x15, 0x00, 0x00, 0x28, 0x00, 0x0a, 0x00, 0x00]));
assert.equal(expGolomb.readUnsignedExpGolomb(), 9, 'the first number is read');
expGolomb.skipBits(17);
assert.equal(expGolomb.readUnsignedExpGolomb(), 4, 'the second number is read');
expGolomb.skipBits(13); // Crosses word boundary
assert.equal(expGolomb.readUnsignedExpGolomb(), 4, 'the third number is read');
});
QUnit.test('parses a sequence parameter set', function(assert) {
var
sps = new Uint8Array([
0x27, 0x42, 0xe0, 0x0b,
0xa9, 0x18, 0x60, 0x9d,
0x80, 0x35, 0x06, 0x01,
0x06, 0xb6, 0xc2, 0xb5,
0xef, 0x7c, 0x04
]),
expGolomb = new ExpGolomb(sps);
assert.strictEqual(expGolomb.readBits(8), 0x27, 'the NAL type specifies an SPS');
assert.strictEqual(expGolomb.readBits(8), 66, 'profile_idc is 66');
assert.strictEqual(expGolomb.readBits(4), 0x0E, 'constraints 0-3 are correct');
expGolomb.skipBits(4);
assert.strictEqual(expGolomb.readBits(8), 11, 'level_idc is 11');
assert.strictEqual(expGolomb.readUnsignedExpGolomb(), 0, 'seq_parameter_set_id is 0');
assert.strictEqual(expGolomb.readUnsignedExpGolomb(), 1, 'log2_max_frame_num_minus4 is 1');
assert.strictEqual(expGolomb.readUnsignedExpGolomb(), 0, 'pic_order_cnt_type is 0');
assert.strictEqual(expGolomb.readUnsignedExpGolomb(), 3, 'log2_max_pic_order_cnt_lsb_minus4 is 3');
assert.strictEqual(expGolomb.readUnsignedExpGolomb(), 2, 'max_num_ref_frames is 2');
assert.strictEqual(expGolomb.readBits(1), 0, 'gaps_in_frame_num_value_allowed_flag is false');
assert.strictEqual(expGolomb.readUnsignedExpGolomb(), 11, 'pic_width_in_mbs_minus1 is 11');
assert.strictEqual(expGolomb.readUnsignedExpGolomb(), 8, 'pic_height_in_map_units_minus1 is 8');
assert.strictEqual(expGolomb.readBits(1), 1, 'frame_mbs_only_flag is true');
assert.strictEqual(expGolomb.readBits(1), 1, 'direct_8x8_inference_flag is true');
assert.strictEqual(expGolomb.readBits(1), 0, 'frame_cropping_flag is false');
});