static ShazamResult CaptureAndTag()
{
var analysis = new Analysis();
var finder = new LandmarkFinder(analysis);
using (var capture = new WasapiCapture()) {
var captureBuf = new BufferedWaveProvider(capture.WaveFormat)
{
ReadFully = false
};
capture.DataAvailable += (s, e) => {
captureBuf.AddSamples(e.Buffer, 0, e.BytesRecorded);
};
capture.StartRecording();
using (var resampler = new MediaFoundationResampler(captureBuf, new WaveFormat(Analysis.SAMPLE_RATE, 16, 1))) {
var sampleProvider = resampler.ToSampleProvider();
var retryMs = 3000;
var tagId = Guid.NewGuid().ToString();
while (true)
{
while (captureBuf.BufferedDuration.TotalSeconds < 1)
{
Thread.Sleep(100);
}
analysis.ReadChunk(sampleProvider);
if (analysis.StripeCount > 2 * LandmarkFinder.RADIUS_TIME)
{
finder.Find(analysis.StripeCount - LandmarkFinder.RADIUS_TIME - 1);
}
if (analysis.ProcessedMs >= retryMs)
{
//new Painter(analysis, finder).Paint("c:/temp/spectro.png");
//new Synthback(analysis, finder).Synth("c:/temp/synthback.raw");
var sigBytes = Sig.Write(Analysis.SAMPLE_RATE, analysis.ProcessedSamples, finder);
var result = ShazamApi.SendRequest(tagId, analysis.ProcessedMs, sigBytes).GetAwaiter().GetResult();
if (result.Success)
{
return(result);
}
retryMs = result.RetryMs;
if (retryMs == 0)
{
return(result);
}
}
}
}
}
}
public static byte[] Write(int sampleRate, int sampleCount, LandmarkFinder finder)
{
using (var mem = new MemoryStream())
using (var writer = new BinaryWriter(mem)) {
writer.Write(0xCAFE2580); // Dialling "2580" on your phone and holding it up to the music, https://www.shazam.com/company
writer.Write(-1);
writer.Write(-1);
writer.Write(0x94119C00);
writer.Write(0);
writer.Write(0);
writer.Write(0);
writer.Write(GetSampleRateCode(sampleRate) << 27);
writer.Write(0);
writer.Write(0);
writer.Write(sampleCount);
writer.Write(0x007C0000);
writer.Write(0x40000000);
writer.Write(-1);
var bandData = GetBandData(finder);
for (var i = 0; i < bandData.Length; i++)
{
writer.Write(0x60030040 + i);
writer.Write(bandData[i].Length);
writer.Write(bandData[i]);
}
var totalLen = (int)mem.Length;
var contentLen = totalLen - 48;
foreach (var i in new[] { 2, 13 })
{
mem.Position = i * 4;
writer.Write(contentLen);
}
var crc = Force.Crc32.Crc32Algorithm.Compute(mem.GetBuffer(), 8, totalLen - 8);
mem.Position = 4;
writer.Write(crc);
return(mem.ToArray());
}
}
public Synthback(Analysis analysis, LandmarkFinder finder)
{
Analysis = analysis;
Finder = finder;
}
public Painter(Analysis analysis, LandmarkFinder finder)
{
Analysis = analysis;
Finder = finder;
}
// Alternative (legacy?) format used in ShazamCore10.dll
// Works with any sample rate
public static byte[] Write2(int sampleRate, int sampleCount, LandmarkFinder finder)
{
using (var mem = new MemoryStream())
using (var writer = new BinaryWriter(mem)) {
writer.Write(-1);
writer.Write(0x789ABC05);
writer.Write(0xFFFFFFFF);
writer.Write(0x30000002);
writer.Write(0x10);
writer.Write(-1);
writer.Write(-1);
writer.Write(0);
writer.Write(0);
writer.Write(0x40000000);
writer.Write(-1);
writer.Write(0);
writer.Write(0);
writer.Write(0);
writer.Write(0);
writer.Write(0x50000001);
writer.Write(0x18);
writer.Write(0);
writer.Write(0);
writer.Write(0);
writer.Write(0xDEADBEEF);
writer.Write(Convert.ToInt32(sampleCount * 8000L / sampleRate));
writer.Write(0);
writer.Write(0x31100000);
writer.Write(0x0f);
writer.Write(0x42700000);
var bandData = GetBandData(finder);
for (var i = 0; i < bandData.Length; i++)
{
writer.Write(0);
writer.Write(0x60030040 + i);
writer.Write(bandData[i].Length);
writer.Write(0);
writer.Write(0);
writer.Write(0);
writer.Write(bandData[i]);
}
var totalLen = (int)mem.Length;
var contentLen = totalLen - 32;
foreach (var i in new[] { 0, 5, 10 })
{
mem.Position = i * 4;
writer.Write(contentLen);
}
mem.Position = 6 * 4;
writer.Write(contentLen ^ 0x789ABC13);
var buffer = mem.GetBuffer();
var checksum = (uint)0;
for (var i = 0; i < totalLen / 4; i++)
{
checksum += BitConverter.ToUInt32(buffer, 4 * i);
}
mem.Position = 7 * 4;
writer.Write(checksum);
return(mem.ToArray());
}
}
static byte[][] GetBandData(LandmarkFinder finder)
{
return(finder.EnumerateBandedLandmarks().Select(GetBandData).ToArray());
}
