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#if NET_2_0
using System;
using System.IO;
using System.Runtime.InteropServices;
namespace Mono.Audio {
#if PUBLIC_API
public
#else
internal
#endif
abstract class AudioData {
protected const int buffer_size = 4096;
bool stopped = false;
public abstract int Channels {
get;
}
public abstract int Rate {
get;
}
public abstract AudioFormat Format {
get;
}
public virtual void Setup (AudioDevice dev) {
dev.SetFormat (Format, Channels, Rate);
}
public abstract void Play (AudioDevice dev);
public virtual bool IsStopped {
get {
return stopped;
}
set {
stopped = value;
}
}
}
/*public enum WavCmpCodes {
Unknown,
PCM,
ADPCM,
}*/
#if PUBLIC_API
public
#else
internal
#endif
class WavData : AudioData {
Stream stream;
short channels;
ushort frame_divider;
int sample_rate;
int data_len = 0;
AudioFormat format;
public WavData (Stream data) {
stream = data;
byte[] buffer = new byte [12+32];
int c = stream.Read (buffer, 0, 12 + 32);
if (c != (12 + 32) ||
buffer [0] != 'R' || buffer [1] != 'I' || buffer [2] != 'F' || buffer [3] != 'F' ||
buffer [8] != 'W' || buffer [9] != 'A' || buffer [10] != 'V' || buffer [11] != 'E') {
throw new Exception ("incorrect format" + c);
}
if (buffer [12] != 'f' || buffer [13] != 'm' || buffer [14] != 't' || buffer [15] != ' ') {
throw new Exception ("incorrect format (fmt)");
}
int extra_size = buffer [16];
extra_size |= buffer [17] << 8;
extra_size |= buffer [18] << 16;
extra_size |= buffer [19] << 24;
int compression = buffer [20] | (buffer [21] << 8);
if (compression != 1)
throw new Exception ("incorrect format (not PCM)");
channels = (short)(buffer [22] | (buffer [23] << 8));
sample_rate = buffer [24];
sample_rate |= buffer [25] << 8;
sample_rate |= buffer [26] << 16;
sample_rate |= buffer [27] << 24;
int avg_bytes = buffer [28];
avg_bytes |= buffer [29] << 8;
avg_bytes |= buffer [30] << 16;
avg_bytes |= buffer [31] << 24;
//int block_align = buffer [32] | (buffer [33] << 8);
int sign_bits = buffer [34] | (buffer [35] << 8);
/*Console.WriteLine (extra_size);
Console.WriteLine (compression);
Console.WriteLine (channels);
Console.WriteLine (sample_rate);
Console.WriteLine (avg_bytes);
Console.WriteLine (block_align);
Console.WriteLine (sign_bits);*/
if (buffer [36] != 'd' || buffer [37] != 'a' || buffer [38] != 't' || buffer [39] != 'a') {
throw new Exception ("incorrect format (data)");
}
int sample_size = buffer [40];
sample_size |= buffer [41] << 8;
sample_size |= buffer [42] << 16;
sample_size |= buffer [43] << 24;
data_len = sample_size;
//Console.WriteLine (sample_size);
switch (sign_bits) {
case 8:
frame_divider = 1;
format = AudioFormat.U8; break;
case 16:
frame_divider = 2;
format = AudioFormat.S16_LE; break;
default:
throw new Exception ("bits per sample");
}
}
public override void Play (AudioDevice dev) {
int read;
int count = data_len;
byte[] buffer = new byte [buffer_size];
stream.Position = 0;
while (!IsStopped && count >= 0 && (read = stream.Read (buffer, 0, System.Math.Min (buffer.Length, count))) > 0) {
// FIXME: account for leftover bytes
dev.PlaySample (buffer, read/frame_divider);
count -= read;
}
}
public override int Channels {
get {return channels;}
}
public override int Rate {
get {return sample_rate;}
}
public override AudioFormat Format {
get {return format;}
}
}
// http://en.wikipedia.org/wiki/Au_file_format
#if PUBLIC_API
public
#else
internal
#endif
class AuData : AudioData {
Stream stream;
short channels;
ushort frame_divider;
int sample_rate;
int data_len = 0;
AudioFormat format;
public AuData (Stream data) {
stream = data;
byte[] buffer = new byte [24];
int c = stream.Read (buffer, 0, 24);
if (c != 24 ||
buffer [0] != '.' || buffer [1] != 's' || buffer [2] != 'n' || buffer [3] != 'd') {
throw new Exception ("incorrect format" + c);
}
int data_offset = buffer [7];
data_offset |= buffer [6] << 8;
data_offset |= buffer [5] << 16;
data_offset |= buffer [4] << 24;
data_len = buffer [11];
data_len |= buffer [10] << 8;
data_len |= buffer [9] << 16;
data_len |= buffer [8] << 24;
int encoding = buffer [15];
encoding |= buffer [14] << 8;
encoding |= buffer [13] << 16;
encoding |= buffer [12] << 24;
sample_rate = buffer [19];
sample_rate |= buffer [18] << 8;
sample_rate |= buffer [17] << 16;
sample_rate |= buffer [16] << 24;
int chans = buffer [23];
chans |= buffer [22] << 8;
chans |= buffer [21] << 16;
chans |= buffer [20] << 24;
channels = (short)chans;
if (data_offset < 24 || (chans != 1 && chans != 2)) {
throw new Exception ("incorrect format offset" + data_offset);
}
if (data_offset != 24) {
for (int l = 24; l < data_offset; ++l)
stream.ReadByte ();
}
switch (encoding) {
case 1:
frame_divider = 1;
format = AudioFormat.MU_LAW; break;
default:
throw new Exception ("incorrect format encoding" + encoding);
}
if (data_len == -1) {
data_len = (int)stream.Length - data_offset;
}
// Console.WriteLine ("format: {0}, rate: {1}", format, sample_rate);
}
public override void Play (AudioDevice dev) {
int read;
int count = data_len;
byte[] buffer = new byte [buffer_size];
stream.Position = 0;
while (!IsStopped && count >= 0 && (read = stream.Read (buffer, 0, System.Math.Min (buffer.Length, count))) > 0) {
// FIXME: account for leftover bytes
dev.PlaySample (buffer, read/frame_divider);
count -= read;
}
}
public override int Channels {
get {return channels;}
}
public override int Rate {
get {return sample_rate;}
}
public override AudioFormat Format {
get {return format;}
}
}
}
#endif
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