protected override void GetSampleAsync (MediaStreamType mediaStreamType)
{
Mp3Frame frame;
MediaStreamSample sample;
Dictionary<MediaSampleAttributeKeys, string> attribs = new Dictionary<MediaSampleAttributeKeys, string> ();
//string format = "HH:mm:ss.ffff";
//if (opened == DateTime.MinValue)
// opened = DateTime.Now;
//Debug.WriteLine ("{0} GetSampleAsync stamp: {1}", (DateTime.Now - opened).ToString (), TimeSpan.FromMilliseconds (current_pts / 10000).ToString ());
try {
if (this.frame != null) {
frame = this.frame;
this.frame = null;
} else {
frame = Mp3Frame.Read (stream);
}
sample = new MediaStreamSample (description, new MemoryStream (frame.data), 0, frame.data.Length, current_pts, attribs);
current_pts += frame.Duration;
ReportGetSampleCompleted (sample);
} catch (System.IO.EndOfStreamException ex) {
Console.WriteLine (ex);
sample = new MediaStreamSample (description, null, 0, 0, 0, attribs);
ReportGetSampleCompleted (sample);
} catch (Exception ex) {
Console.WriteLine (ex);
ReportGetSampleCompleted (null);
}
}
public static Mp3Frame Read (BinaryReader stream)
{
Mp3Frame result = new Mp3Frame ();
uint header = 0;
uint version, layer, bitrate, samplerate, padding, channel;
do {
header <<= 8;
header += stream.ReadByte ();
} while ((header & sync_mask) != sync_mask);
version = (header & version_mask) >> version_shift;
layer = (header & layer_mask) >> layer_shift;
bitrate = (header & bitrate_mask) >> bitrate_shift;
samplerate = (header & samplerate_mask) >> samplerate_shift;
padding = (header & padding_mask) >> padding_shift;
channel = (header & channel_mask) >> channel_shift;
result.Padding = (int) padding;
result.Channels = channel == 3 ? 1 : 2;
switch (layer) {
case 1:
result.Layer = 3;
break;
case 2:
result.Layer = 2;
break;
case 3:
result.Layer = 1;
break;
default:
throw new InvalidOperationException ();
}
switch (version) {
case 1:
result.Version = 3; // 2.5
break;
case 2:
result.Version = 2; // 2
break;
case 3:
result.Version = 1; // 1
break;
default:
throw new InvalidOperationException ();
}
result.SampleRate = sample_rates [result.Version - 1, samplerate];
switch (result.Version) {
case 1:
result.Bitrate = mpeg1_bitrates [result.Layer - 1, bitrate];
break;
case 2:
case 3:
result.Bitrate = mpeg2_bitrates [result.Layer - 1, bitrate];
break;
default:
throw new InvalidOperationException ();
}
switch (result.Layer) {
case 1:
result.FrameSize = ((12 * result.Bitrate / result.SampleRate) + result.Padding) * 4;
break;
case 2:
case 3:
result.FrameSize = (144 * result.Bitrate / result.SampleRate) + result.Padding;
break;
default:
throw new InvalidOperationException ();
}
result.Duration = block_sizes [result.Version - 1, result.Layer - 1];
result.Duration *= 10000000;
result.Duration /= result.SampleRate;
//System.Diagnostics.Debug.WriteLine ("Found header: {0:X8} at {7}, version: {1}, layer: {2}, bitrate: {3}, samplerate: {4}, padding: {5}, channel: {6} Duration: {8}",
// header, version, layer, bitrate, samplerate, padding, channel, stream.BaseStream.Position, result.Duration);
using (MemoryStream memory = new MemoryStream ()) {
using (BinaryWriter writer = new BinaryWriter (memory)) {
writer.Write ((byte) ((header & 0xFF000000) >> 24));
writer.Write ((byte) ((header & 0x00FF0000) >> 16));
writer.Write ((byte) ((header & 0x0000FF00) >> 8));
writer.Write ((byte) ((header & 0x000000FF)));
for (int i = 0; i < result.FrameSize - 4; i++)
writer.Write (stream.ReadByte ());
writer.Flush ();
result.data = memory.ToArray ();
}
}
return result;
}
public static Mp3Frame Read(BinaryReader stream)
{
Mp3Frame result = new Mp3Frame();
uint header = 0;
uint version, layer, bitrate, samplerate, padding, channel;
do
{
header <<= 8;
header += stream.ReadByte();
} while ((header & sync_mask) != sync_mask);
version = (header & version_mask) >> version_shift;
layer = (header & layer_mask) >> layer_shift;
bitrate = (header & bitrate_mask) >> bitrate_shift;
samplerate = (header & samplerate_mask) >> samplerate_shift;
padding = (header & padding_mask) >> padding_shift;
channel = (header & channel_mask) >> channel_shift;
result.Padding = (int)padding;
result.Channels = channel == 3 ? 1 : 2;
switch (layer)
{
case 1:
result.Layer = 3;
break;
case 2:
result.Layer = 2;
break;
case 3:
result.Layer = 1;
break;
default:
throw new InvalidOperationException();
}
switch (version)
{
case 1:
result.Version = 3; // 2.5
break;
case 2:
result.Version = 2; // 2
break;
case 3:
result.Version = 1; // 1
break;
default:
throw new InvalidOperationException();
}
result.SampleRate = sample_rates [result.Version - 1, samplerate];
switch (result.Version)
{
case 1:
result.Bitrate = mpeg1_bitrates [result.Layer - 1, bitrate];
break;
case 2:
case 3:
result.Bitrate = mpeg2_bitrates [result.Layer - 1, bitrate];
break;
default:
throw new InvalidOperationException();
}
switch (result.Layer)
{
case 1:
result.FrameSize = ((12 * result.Bitrate / result.SampleRate) + result.Padding) * 4;
break;
case 2:
case 3:
result.FrameSize = (144 * result.Bitrate / result.SampleRate) + result.Padding;
break;
default:
throw new InvalidOperationException();
}
result.Duration = block_sizes [result.Version - 1, result.Layer - 1];
result.Duration *= 10000000;
result.Duration /= result.SampleRate;
//System.Diagnostics.Debug.WriteLine ("Found header: {0:X8} at {7}, version: {1}, layer: {2}, bitrate: {3}, samplerate: {4}, padding: {5}, channel: {6} Duration: {8}",
// header, version, layer, bitrate, samplerate, padding, channel, stream.BaseStream.Position, result.Duration);
using (MemoryStream memory = new MemoryStream()) {
using (BinaryWriter writer = new BinaryWriter(memory)) {
writer.Write((byte)((header & 0xFF000000) >> 24));
writer.Write((byte)((header & 0x00FF0000) >> 16));
writer.Write((byte)((header & 0x0000FF00) >> 8));
writer.Write((byte)((header & 0x000000FF)));
for (int i = 0; i < result.FrameSize - 4; i++)
{
writer.Write(stream.ReadByte());
}
writer.Flush();
result.data = memory.ToArray();
}
}
return(result);
}
protected override void OpenMediaAsync ()
{
Dictionary<MediaSourceAttributesKeys, string> media_attributes = new Dictionary<MediaSourceAttributesKeys, string> ();
List<MediaStreamDescription> media_streams = new List<MediaStreamDescription> ();
Dictionary<MediaStreamAttributeKeys, string> stream_attributes = new Dictionary<MediaStreamAttributeKeys,string> ();
MediaStreamDescription media_stream = new MediaStreamDescription (MediaStreamType.Audio, stream_attributes);
long duration = 60 * 10000;
WaveFormatEx wave = new WaveFormatEx ();
Mp3Frame frame = Mp3Frame.Read (stream);
wave.FormatTag = 85;
wave.AvgBytesPerSec = (uint) frame.Bitrate / 8;
wave.BitsPerSample = 0;
wave.BlockAlign = 1;
wave.Channels = (ushort) frame.Channels;
wave.SamplesPerSec = (ushort) frame.SampleRate;
wave.Size = 12;
media_attributes.Add (MediaSourceAttributesKeys.CanSeek, "0");
media_attributes.Add (MediaSourceAttributesKeys.Duration, duration.ToString ());
stream_attributes [MediaStreamAttributeKeys.CodecPrivateData] = wave.Encoded;
media_streams.Add (media_stream);
try {
this.frame = frame;
this.description = media_stream;
ReportOpenMediaCompleted (media_attributes, media_streams);
opened = DateTime.Now;
} catch (Exception ex) {
Console.WriteLine (ex);
}
}
