299 lines
8.3 KiB
C#
299 lines
8.3 KiB
C#
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using System;
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using System.IO;
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using System.Runtime.InteropServices;
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namespace Mono.Audio {
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#if PUBLIC_API
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public
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#else
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internal
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#endif
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abstract class AudioData {
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protected const int buffer_size = 4096;
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bool stopped;
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public abstract int Channels {
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get;
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}
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public abstract int Rate {
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get;
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}
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public abstract AudioFormat Format {
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get;
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}
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public virtual void Setup (AudioDevice dev) {
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dev.SetFormat (Format, Channels, Rate);
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}
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public abstract void Play (AudioDevice dev);
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public virtual bool IsStopped {
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get {
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return stopped;
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}
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set {
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stopped = value;
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}
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}
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}
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/*public enum WavCmpCodes {
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Unknown,
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PCM,
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ADPCM,
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}*/
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#if PUBLIC_API
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public
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#else
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internal
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#endif
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class WavData : AudioData {
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Stream stream;
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short channels;
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ushort frame_divider;
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int sample_rate;
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int data_len;
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long data_offset;
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AudioFormat format;
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public WavData (Stream data) {
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stream = data;
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byte[] buffer = new byte [12 + 32];
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int idx;
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// Read Chunk ID + Format
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int c = stream.Read (buffer, 0, 12);
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if (c != 12 ||
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buffer [0] != 'R' || buffer [1] != 'I' || buffer [2] != 'F' || buffer [3] != 'F' ||
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buffer [8] != 'W' || buffer [9] != 'A' || buffer [10] != 'V' || buffer [11] != 'E') {
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throw new Exception ("incorrect format" + c);
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}
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// Read SubChunk 1 ID + Size => Must be 'fmt ' !
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c = stream.Read (buffer, 0, 8);
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if (c == 8 && buffer [0] == 'f' && buffer [1] == 'm' && buffer [2] == 't' && buffer [3] == ' ') {
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int sub_chunk_1_size = buffer [4];
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sub_chunk_1_size |= buffer [5] << 8;
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sub_chunk_1_size |= buffer [6] << 16;
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sub_chunk_1_size |= buffer [7] << 24;
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// Read SubChunk 1 Data
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c = stream.Read (buffer, 0, sub_chunk_1_size);
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if (sub_chunk_1_size == c)
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{
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idx = 0;
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int compression = buffer [idx++] | (buffer [idx++] << 8);
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if (compression != 1)
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throw new Exception ("incorrect format (not PCM)");
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channels = (short)(buffer [idx++] | (buffer [idx++] << 8));
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sample_rate = buffer [idx++];
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sample_rate |= buffer [idx++] << 8;
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sample_rate |= buffer [idx++] << 16;
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sample_rate |= buffer [idx++] << 24;
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int byte_rate = buffer [idx++];
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byte_rate |= buffer [idx++] << 8;
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byte_rate |= buffer [idx++] << 16;
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byte_rate |= buffer [idx++] << 24;
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// int block_align = buffer [idx++] | (buffer [idx++] << 8);
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idx += 2; //because, the above line is commented out
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int sign_bits = buffer [idx++] | (buffer [idx++] << 8);
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switch (sign_bits) {
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case 8:
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frame_divider = 1;
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format = AudioFormat.U8; break;
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case 16:
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frame_divider = 2;
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format = AudioFormat.S16_LE; break;
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default:
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throw new Exception ("bits per sample");
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}
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} else {
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throw new Exception ("Error: Can't Read "+sub_chunk_1_size+" bytes from stream ("+c+" bytes read");
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}
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} else {
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throw new Exception ("incorrect format (fmt)");
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}
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// Read SubChunk 2 ID + Size => Could be 'fact' or 'data' !
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c = stream.Read (buffer, 0, 8);
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if (c == 8) {
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// If SubChunk 2 ID = fact
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if (buffer [0] == 'f' && buffer [1] == 'a' && buffer [2] == 'c' && buffer [3] == 't') {
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// Read Data
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int sub_chunk_2_size = buffer [4];
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sub_chunk_2_size |= buffer [5] << 8;
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sub_chunk_2_size |= buffer [6] << 16;
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sub_chunk_2_size |= buffer [7] << 24;
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c = stream.Read (buffer, 0, sub_chunk_2_size);
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// Don't care about this data !
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// If there is a fact Chunck, read the next subChunk Id and size (should be data !)
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c = stream.Read (buffer, 0, 8);
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}
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if (buffer [0] == 'd' && buffer [1] == 'a' && buffer [2] == 't' && buffer [3] == 'a') {
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// Read Data
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int sub_chunk_2_size = buffer [4];
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sub_chunk_2_size |= buffer [5] << 8;
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sub_chunk_2_size |= buffer [6] << 16;
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sub_chunk_2_size |= buffer [7] << 24;
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data_len = sub_chunk_2_size;
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data_offset = stream.Position;
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} else {
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throw new Exception ("incorrect format (data/fact chunck)");
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}
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}
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}
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public override void Play (AudioDevice dev) {
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int fragment_played = 0;
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int total_data_played = 0;
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int chunk_size = (int)dev.ChunkSize;
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int count = data_len;
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byte[] buffer = new byte [data_len];
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byte[] chunk_to_play = new byte [chunk_size];
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// Read only wave data, don't care about file header here !
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stream.Position = data_offset;
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stream.Read (buffer, 0, data_len);
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while (!IsStopped && count >= 0){
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// Copy one chunk from buffer
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Buffer.BlockCopy(buffer, total_data_played, chunk_to_play, 0, chunk_size);
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// play that chunk, !!! the size pass to alsa the number of fragment, a fragment is a sample per channel !!!
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fragment_played = dev.PlaySample (chunk_to_play, chunk_size / (frame_divider * channels));
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// If alsa played something, inc the total data played and dec the data to be played
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if (fragment_played > 0) {
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total_data_played += (fragment_played * frame_divider * channels);
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count -= (fragment_played * frame_divider * channels);
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}
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}
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}
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public override int Channels {
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get {return channels;}
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}
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public override int Rate {
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get {return sample_rate;}
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}
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public override AudioFormat Format {
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get {return format;}
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}
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}
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// http://en.wikipedia.org/wiki/Au_file_format
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#if PUBLIC_API
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public
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#else
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internal
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#endif
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class AuData : AudioData {
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Stream stream;
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short channels;
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ushort frame_divider;
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int sample_rate;
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int data_len ;
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// int data_offset;
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AudioFormat format;
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public AuData (Stream data) {
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stream = data;
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byte[] buffer = new byte [24];
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int c = stream.Read (buffer, 0, 24);
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if (c != 24 ||
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buffer [0] != '.' || buffer [1] != 's' || buffer [2] != 'n' || buffer [3] != 'd') {
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throw new Exception ("incorrect format" + c);
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}
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int data_offset = buffer [7];
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data_offset |= buffer [6] << 8;
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data_offset |= buffer [5] << 16;
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data_offset |= buffer [4] << 24;
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data_len = buffer [11];
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data_len |= buffer [10] << 8;
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data_len |= buffer [9] << 16;
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data_len |= buffer [8] << 24;
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int encoding = buffer [15];
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encoding |= buffer [14] << 8;
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encoding |= buffer [13] << 16;
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encoding |= buffer [12] << 24;
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sample_rate = buffer [19];
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sample_rate |= buffer [18] << 8;
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sample_rate |= buffer [17] << 16;
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sample_rate |= buffer [16] << 24;
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int chans = buffer [23];
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chans |= buffer [22] << 8;
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chans |= buffer [21] << 16;
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chans |= buffer [20] << 24;
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channels = (short)chans;
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if (data_offset < 24 || (chans != 1 && chans != 2)) {
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throw new Exception ("incorrect format offset" + data_offset);
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}
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if (data_offset != 24) {
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for (int l = 24; l < data_offset; ++l)
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stream.ReadByte ();
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}
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switch (encoding) {
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case 1:
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frame_divider = 1;
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format = AudioFormat.MU_LAW; break;
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default:
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throw new Exception ("incorrect format encoding" + encoding);
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}
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if (data_len == -1) {
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data_len = (int)stream.Length - data_offset;
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}
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// Console.WriteLine ("format: {0}, rate: {1}", format, sample_rate);
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}
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public override void Play (AudioDevice dev) {
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int fragment_played = 0;
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int total_data_played = 0;
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int chunk_size = (int)dev.ChunkSize;
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int count = data_len;
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byte[] buffer = new byte [data_len];
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byte[] chunk_to_play = new byte [chunk_size];
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// Read only Au data, don't care about file header here !
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stream.Position = 0; //(long)data_offset;
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stream.Read (buffer, 0, data_len);
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while (!IsStopped && count >= 0){
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// Copy one chunk from buffer
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Buffer.BlockCopy(buffer, total_data_played, chunk_to_play, 0, chunk_size);
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// play that chunk, !!! the size pass to alsa the number of fragment, a fragment is a sample per channel !!!
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fragment_played = dev.PlaySample (chunk_to_play, chunk_size / (frame_divider * channels));
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// If alsa played something, inc the total data played and dec the data to be played
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if (fragment_played > 0) {
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total_data_played += (fragment_played * frame_divider * channels);
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count -= (fragment_played * frame_divider * channels);
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}
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}
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}
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public override int Channels {
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get {return channels;}
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}
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public override int Rate {
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get {return sample_rate;}
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}
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public override AudioFormat Format {
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get {return format;}
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}
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}
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}
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