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AWavLoader: Support 24 bit wav files (mono & stereo)

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This commit is contained in:
Robin Burchell
2019-07-18 13:24:01 +02:00
committed by Andreas Kling
parent 7de79d3bbb
commit a2fbfb6cef
1 changed files with 53 additions and 2 deletions
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55
Libraries/LibAudio/AWavLoader.cpp
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@@ -83,8 +83,8 @@ RefPtr<ABuffer> AWavLoader::parse_wav(ByteBuffer& buffer)
u16 bits_per_sample; stream >> bits_per_sample;
CHECK_OK("Bits per sample"); // incomplete read check
ok = ok && (bits_per_sample == 8 || bits_per_sample == 16);
ASSERT(bits_per_sample == 8 || bits_per_sample == 16);
ok = ok && (bits_per_sample == 8 || bits_per_sample == 16 || bits_per_sample == 24);
ASSERT(bits_per_sample == 8 || bits_per_sample == 16 || bits_per_sample == 24);
CHECK_OK("Bits per sample"); // value check
// Read chunks until we find DATA
@@ -190,6 +190,54 @@ static void read_samples_from_stream(BufferStream& stream, Vector<ASample>& samp
}
}
static void read_24bit_samples_from_stream(BufferStream& stream, Vector<ASample>& samples, int num_channels, int source_rate)
{
AResampleHelper resampler(source_rate, 44100);
auto read_norm_sample = [&stream]() {
u8 byte = 0;
stream >> byte;
u32 sample1 = byte;
stream >> byte;
u32 sample2 = byte;
stream >> byte;
u32 sample3 = byte;
i32 value = 0;
value = sample1 << 8;
value |= (sample2 << 16);
value |= (sample3 << 24);
return float(value) / std::numeric_limits<i32>::max();
};
float norm_l = 0;
float norm_r = 0;
switch (num_channels) {
case 1:
while (!stream.handle_read_failure()) {
resampler.prepare();
while (resampler.read_sample()) {
norm_l = read_norm_sample();
}
samples.append(ASample(norm_l));
}
break;
case 2:
while (!stream.handle_read_failure()) {
resampler.prepare();
while (resampler.read_sample()) {
norm_l = read_norm_sample();
norm_r = read_norm_sample();
}
samples.append(ASample(norm_l, norm_r));
}
break;
default:
ASSERT_NOT_REACHED();
}
}
// ### can't const this because BufferStream is non-const
// perhaps we need a reading class separate from the writing one, that can be
// entirely consted.
@@ -208,6 +256,9 @@ RefPtr<ABuffer> ABuffer::from_pcm_data(ByteBuffer& data, int num_channels, int b
case 16:
read_samples_from_stream<i16>(stream, fdata, num_channels, source_rate);
break;
case 24:
read_24bit_samples_from_stream(stream, fdata, num_channels, source_rate);
break;
default:
ASSERT_NOT_REACHED();
}