442 lines
19 KiB
C#
442 lines
19 KiB
C#
using System;
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using System.Runtime.InteropServices;
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namespace BizHawk.Emulation.Common
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{
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/// <summary>
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/// junk wrapper around LibSpeexDSP. quite inefficient. will be replaced
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/// </summary>
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public class SpeexResampler : IDisposable, ISyncSoundProvider
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{
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static class LibSpeexDSP
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{
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public const int QUALITY_MAX = 10;
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public const int QUALITY_MIN = 0;
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public const int QUALITY_DEFAULT = 4;
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public const int QUALITY_VOIP = 3;
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public const int QUALITY_DESKTOP = 5;
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public enum RESAMPLER_ERR
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{
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SUCCESS = 0,
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ALLOC_FAILED = 1,
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BAD_STATE = 2,
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INVALID_ARG = 3,
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PTR_OVERLAP = 4,
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MAX_ERROR
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};
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/// <summary>
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/// Create a new resampler with integer input and output rates.
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/// </summary>
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/// <param name="nb_channels">Number of channels to be processed</param>
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/// <param name="in_rate">Input sampling rate (integer number of Hz).</param>
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/// <param name="out_rate">Output sampling rate (integer number of Hz).</param>
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/// <param name="quality">Resampling quality between 0 and 10, where 0 has poor quality and 10 has very high quality.</param>
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/// <param name="err"></param>
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/// <returns>Newly created resampler state</returns>
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[DllImport("libspeexdsp.dll", CallingConvention = CallingConvention.Cdecl)]
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public static extern IntPtr speex_resampler_init(uint nb_channels, uint in_rate, uint out_rate, int quality, ref RESAMPLER_ERR err);
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/// <summary>
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/// Create a new resampler with fractional input/output rates. The sampling
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/// rate ratio is an arbitrary rational number with both the numerator and
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/// denominator being 32-bit integers.
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/// </summary>
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/// <param name="nb_channels">Number of channels to be processed</param>
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/// <param name="ratio_num">Numerator of the sampling rate ratio</param>
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/// <param name="ratio_den">Denominator of the sampling rate ratio</param>
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/// <param name="in_rate">Input sampling rate rounded to the nearest integer (in Hz).</param>
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/// <param name="out_rate">Output sampling rate rounded to the nearest integer (in Hz).</param>
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/// <param name="quality">Resampling quality between 0 and 10, where 0 has poor quality and 10 has very high quality.</param>
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/// <param name="err"></param>
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/// <returns>Newly created resampler state</returns>
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[DllImport("libspeexdsp.dll", CallingConvention = CallingConvention.Cdecl)]
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public static extern IntPtr speex_resampler_init_frac(uint nb_channels, uint ratio_num, uint ratio_den, uint in_rate, uint out_rate, int quality, ref RESAMPLER_ERR err);
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/// <summary>
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/// Destroy a resampler state.
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/// </summary>
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/// <param name="st">Resampler state</param>
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[DllImport("libspeexdsp.dll", CallingConvention = CallingConvention.Cdecl)]
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public static extern void speex_resampler_destroy(IntPtr st);
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/// <summary>
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/// Resample a float array. The input and output buffers must *not* overlap.
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/// </summary>
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/// <param name="st">Resampler state</param>
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/// <param name="channel_index">Index of the channel to process for the multi-channel base (0 otherwise)</param>
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/// <param name="inp">Input buffer</param>
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/// <param name="in_len">Number of input samples in the input buffer. Returns the number of samples processed</param>
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/// <param name="outp">Output buffer</param>
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/// <param name="out_len">Size of the output buffer. Returns the number of samples written</param>
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/// <returns></returns>
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[DllImport("libspeexdsp.dll", CallingConvention = CallingConvention.Cdecl)]
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public static extern RESAMPLER_ERR speex_resampler_process_float(IntPtr st, uint channel_index, float[] inp, ref uint in_len, float[] outp, ref uint out_len);
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/// <summary>
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/// Resample an int array. The input and output buffers must *not* overlap.
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/// </summary>
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/// <param name="st">Resampler state</param>
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/// <param name="channel_index">Index of the channel to process for the multi-channel base (0 otherwise)</param>
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/// <param name="inp">Input buffer</param>
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/// <param name="in_len">Number of input samples in the input buffer. Returns the number of samples processed</param>
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/// <param name="outp">Output buffer</param>
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/// <param name="out_len">Size of the output buffer. Returns the number of samples written</param>
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/// <returns></returns>
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[DllImport("libspeexdsp.dll", CallingConvention = CallingConvention.Cdecl)]
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public static extern RESAMPLER_ERR speex_resampler_process_int(IntPtr st, uint channel_index, short[] inp, ref uint in_len, short[] outp, ref uint out_len);
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/// <summary>
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/// Resample an interleaved float array. The input and output buffers must *not* overlap.
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/// </summary>
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/// <param name="st">Resampler state</param>
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/// <param name="inp">Input buffer</param>
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/// <param name="in_len">Number of input samples in the input buffer. Returns the number of samples processed. This is all per-channel.</param>
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/// <param name="outp">Output buffer</param>
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/// <param name="out_len">Size of the output buffer. Returns the number of samples written. This is all per-channel.</param>
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/// <returns></returns>
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[DllImport("libspeexdsp.dll", CallingConvention = CallingConvention.Cdecl)]
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public static extern RESAMPLER_ERR speex_resampler_process_interleaved_float(IntPtr st, float[] inp, ref uint in_len, float[] outp, ref uint out_len);
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/// <summary>
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/// Resample an interleaved int array. The input and output buffers must *not* overlap.
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/// </summary>
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/// <param name="st">Resampler state</param>
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/// <param name="inp">Input buffer</param>
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/// <param name="in_len">Number of input samples in the input buffer. Returns the number of samples processed. This is all per-channel.</param>
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/// <param name="outp">Output buffer</param>
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/// <param name="out_len">Size of the output buffer. Returns the number of samples written. This is all per-channel.</param>
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/// <returns></returns>
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[DllImport("libspeexdsp.dll", CallingConvention = CallingConvention.Cdecl)]
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public static extern RESAMPLER_ERR speex_resampler_process_interleaved_int(IntPtr st, short[] inp, ref uint in_len, short[] outp, ref uint out_len);
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/// <summary>
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/// Set (change) the input/output sampling rates (integer value).
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/// </summary>
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/// <param name="st">Resampler state</param>
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/// <param name="in_rate">Input sampling rate (integer number of Hz).</param>
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/// <param name="out_rate">Output sampling rate (integer number of Hz).</param>
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/// <returns></returns>
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[DllImport("libspeexdsp.dll", CallingConvention = CallingConvention.Cdecl)]
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public static extern RESAMPLER_ERR speex_resampler_set_rate(IntPtr st, uint in_rate, uint out_rate);
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/// <summary>
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/// Get the current input/output sampling rates (integer value).
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/// </summary>
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/// <param name="st">Resampler state</param>
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/// <param name="in_rate">Input sampling rate (integer number of Hz) copied.</param>
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/// <param name="out_rate">Output sampling rate (integer number of Hz) copied.</param>
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[DllImport("libspeexdsp.dll", CallingConvention = CallingConvention.Cdecl)]
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public static extern void speex_resampler_get_rate(IntPtr st, ref uint in_rate, ref uint out_rate);
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/// <summary>
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/// Set (change) the input/output sampling rates and resampling ratio (fractional values in Hz supported).
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/// </summary>
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/// <param name="st">esampler state</param>
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/// <param name="ratio_num">Numerator of the sampling rate ratio</param>
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/// <param name="ratio_den">Denominator of the sampling rate ratio</param>
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/// <param name="in_rate">Input sampling rate rounded to the nearest integer (in Hz).</param>
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/// <param name="out_rate">Output sampling rate rounded to the nearest integer (in Hz).</param>
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/// <returns></returns>
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[DllImport("libspeexdsp.dll", CallingConvention = CallingConvention.Cdecl)]
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public static extern RESAMPLER_ERR speex_resampler_set_rate_frac(IntPtr st, uint ratio_num, uint ratio_den, uint in_rate, uint out_rate);
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/// <summary>
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/// Get the current resampling ratio. This will be reduced to the least common denominator.
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/// </summary>
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/// <param name="st">Resampler state</param>
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/// <param name="ratio_num">Numerator of the sampling rate ratio copied</param>
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/// <param name="ratio_den">Denominator of the sampling rate ratio copied</param>
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[DllImport("libspeexdsp.dll", CallingConvention = CallingConvention.Cdecl)]
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public static extern void speex_resampler_get_ratio(IntPtr st, ref uint ratio_num, ref uint ratio_den);
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/// <summary>
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/// Set (change) the conversion quality.
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/// </summary>
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/// <param name="st">Resampler state</param>
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/// <param name="quality">Resampling quality between 0 and 10, where 0 has poor quality and 10 has very high quality.</param>
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/// <returns></returns>
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[DllImport("libspeexdsp.dll", CallingConvention = CallingConvention.Cdecl)]
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public static extern RESAMPLER_ERR speex_resampler_set_quality(IntPtr st, int quality);
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/// <summary>
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/// Get the conversion quality.
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/// </summary>
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/// <param name="st">Resampler state</param>
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/// <param name="quality">Resampling quality between 0 and 10, where 0 has poor quality and 10 has very high quality.</param>
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[DllImport("libspeexdsp.dll", CallingConvention = CallingConvention.Cdecl)]
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public static extern void speex_resampler_get_quality(IntPtr st, ref int quality);
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/// <summary>
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/// Set (change) the input stride.
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/// </summary>
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/// <param name="st">Resampler state</param>
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/// <param name="stride">Input stride</param>
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[DllImport("libspeexdsp.dll", CallingConvention = CallingConvention.Cdecl)]
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public static extern void speex_resampler_set_input_stride(IntPtr st, uint stride);
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/// <summary>
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/// Get the input stride.
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/// </summary>
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/// <param name="st">Resampler state</param>
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/// <param name="stride">Input stride copied</param>
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[DllImport("libspeexdsp.dll", CallingConvention = CallingConvention.Cdecl)]
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public static extern void speex_resampler_get_input_stride(IntPtr st, ref uint stride);
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/// <summary>
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/// Set (change) the output stride.
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/// </summary>
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/// <param name="st">Resampler state</param>
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/// <param name="stride">Output stride</param>
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[DllImport("libspeexdsp.dll", CallingConvention = CallingConvention.Cdecl)]
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public static extern void speex_resampler_set_output_stride(IntPtr st, uint stride);
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/// <summary>
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/// Get the output stride.
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/// </summary>
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/// <param name="st">Resampler state</param>
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/// <param name="stride">Output stride copied</param>
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[DllImport("libspeexdsp.dll", CallingConvention = CallingConvention.Cdecl)]
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public static extern void speex_resampler_get_output_stride(IntPtr st, ref uint stride);
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/*these two functions don't exist in our version of the dll
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/// <summary>
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/// Get the latency in input samples introduced by the resampler.
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/// </summary>
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/// <param name="st">Resampler state</param>
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/// <returns></returns>
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[DllImport("libspeexdsp.dll", CallingConvention = CallingConvention.Cdecl)]
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public static extern int speex_resampler_get_input_latency(IntPtr st);
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/// <summary>
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/// Get the latency in output samples introduced by the resampler.
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/// </summary>
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/// <param name="st">Resampler state</param>
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/// <returns></returns>
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[DllImport("libspeexdsp.dll", CallingConvention = CallingConvention.Cdecl)]
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public static extern int speex_resampler_get_output_latency(IntPtr st);
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*/
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/// <summary>
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/// Make sure that the first samples to go out of the resamplers don't have
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/// leading zeros. This is only useful before starting to use a newly created
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/// resampler. It is recommended to use that when resampling an audio file, as
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/// it will generate a file with the same length. For real-time processing,
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/// it is probably easier not to use this call (so that the output duration
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/// is the same for the first frame).
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/// </summary>
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/// <param name="st">Resampler state</param>
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/// <returns></returns>
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[DllImport("libspeexdsp.dll", CallingConvention = CallingConvention.Cdecl)]
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public static extern RESAMPLER_ERR speex_resampler_skip_zeroes(IntPtr st);
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/// <summary>
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/// Reset a resampler so a new (unrelated) stream can be processed.
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/// </summary>
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/// <param name="st">Resampler state</param>
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/// <returns></returns>
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[DllImport("libspeexdsp.dll", CallingConvention = CallingConvention.Cdecl)]
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public static extern RESAMPLER_ERR speex_resampler_reset_mem(IntPtr st);
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/// <summary>
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/// Returns the English meaning for an error code
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/// </summary>
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/// <param name="err">Error code</param>
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/// <returns>English string</returns>
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[DllImport("libspeexdsp.dll", CallingConvention = CallingConvention.Cdecl)]
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public static extern string speex_resampler_strerror(RESAMPLER_ERR err);
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}
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/// <summary>
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/// opaque pointer to state
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/// </summary>
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private IntPtr st = IntPtr.Zero;
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/// <summary>
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/// function to call to dispatch output
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/// </summary>
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private readonly Action<short[], int> drainer;
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// TODO: this size is roughly based on how big you can make the buffer before the snes resampling (32040.5 -> 44100) gets screwed up
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private short[] inbuf = new short[512]; //[8192]; // [512];
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private short[] outbuf;
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// for ISyncSoundProvider
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private short[] outbuf2 = new short[16];
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private int outbuf2pos = 0;
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// to accept an ISyncSoundProvder input
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private readonly ISyncSoundProvider input;
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/// <summary>
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/// in buffer position in samples (not sample pairs)
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/// </summary>
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private int inbufpos = 0;
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/// <summary>
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/// throw an exception based on error state
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/// </summary>
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/// <param name="e"></param>
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static void CheckError(LibSpeexDSP.RESAMPLER_ERR e)
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{
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switch (e)
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{
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case LibSpeexDSP.RESAMPLER_ERR.SUCCESS:
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return;
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case LibSpeexDSP.RESAMPLER_ERR.ALLOC_FAILED:
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throw new InsufficientMemoryException("LibSpeexDSP: Alloc failed");
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case LibSpeexDSP.RESAMPLER_ERR.BAD_STATE:
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throw new Exception("LibSpeexDSP: Bad state");
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case LibSpeexDSP.RESAMPLER_ERR.INVALID_ARG:
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throw new ArgumentException("LibSpeexDSP: Bad Argument");
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case LibSpeexDSP.RESAMPLER_ERR.PTR_OVERLAP:
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throw new Exception("LibSpeexDSP: Buffers cannot overlap");
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}
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}
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/// <summary>
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///
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/// </summary>
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/// <param name="quality">0 to 10</param>
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/// <param name="rationum">numerator of srate change ratio (inrate / outrate)</param>
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/// <param name="ratioden">demonenator of srate change ratio (inrate / outrate)</param>
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/// <param name="sratein">sampling rate in, rounded to nearest hz</param>
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/// <param name="srateout">sampling rate out, rounded to nearest hz</param>
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/// <param name="drainer">function which accepts output as produced. if null, act as an ISyncSoundProvider</param>
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/// <param name="input">source to take input from when output is requested. if null, no autofetching</param>
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public SpeexResampler(int quality, uint rationum, uint ratioden, uint sratein, uint srateout, Action<short[], int> drainer = null, ISyncSoundProvider input = null)
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{
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if (drainer != null && input != null)
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throw new ArgumentException("Can't autofetch without being an ISyncSoundProvider?");
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LibSpeexDSP.RESAMPLER_ERR err = LibSpeexDSP.RESAMPLER_ERR.SUCCESS;
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st = LibSpeexDSP.speex_resampler_init_frac(2, rationum, ratioden, sratein, srateout, quality, ref err);
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if (st == IntPtr.Zero)
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throw new Exception("LibSpeexDSP returned null!");
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CheckError(err);
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this.drainer = drainer ?? InternalDrain;
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this.input = input;
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outbuf = new short[inbuf.Length * ratioden / rationum / 2 * 2 + 128];
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}
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/// <summary>change sampling rate on the fly</summary>
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/// <param name="rationum">numerator of srate change ratio (inrate / outrate)</param>
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/// <param name="ratioden">demonenator of srate change ratio (inrate / outrate)</param>
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/// <param name="sratein">sampling rate in, rounded to nearest hz</param>
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/// <param name="srateout">sampling rate out, rounded to nearest hz</param>
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public void ChangeRate(uint rationum, uint ratioden, uint sratein, uint srateout)
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{
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CheckError(LibSpeexDSP.speex_resampler_set_rate_frac(st, rationum, ratioden, sratein, srateout));
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outbuf = new short[inbuf.Length * ratioden / rationum / 2 * 2 + 128];
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}
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/// <summary>
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/// add a sample to the queue
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/// </summary>
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/// <param name="left"></param>
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/// <param name="right"></param>
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public void EnqueueSample(short left, short right)
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{
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inbuf[inbufpos++] = left;
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inbuf[inbufpos++] = right;
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if (inbufpos == inbuf.Length)
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Flush();
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}
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/// <summary>
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/// add multiple samples to the queue
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/// </summary>
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/// <param name="userbuf">interleaved stereo samples</param>
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/// <param name="nsamp">number of sample pairs</param>
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public void EnqueueSamples(short[] userbuf, int nsamp)
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{
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int numused = 0;
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while (numused < nsamp)
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{
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int shortstocopy = Math.Min(inbuf.Length - inbufpos, (nsamp - numused) * 2);
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Buffer.BlockCopy(userbuf, numused * 2 * sizeof(short), inbuf, inbufpos * sizeof(short), shortstocopy * sizeof(short));
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inbufpos += shortstocopy;
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numused += shortstocopy / 2;
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if (inbufpos == inbuf.Length)
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Flush();
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}
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}
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/// <summary>
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/// flush as many input samples as possible, generating output samples right now
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/// </summary>
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public void Flush()
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{
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uint inal = (uint)inbufpos / 2;
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uint outal = (uint)outbuf.Length / 2;
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LibSpeexDSP.speex_resampler_process_interleaved_int(st, inbuf, ref inal, outbuf, ref outal);
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// reset inbuf
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if (inal != inbufpos / 2)
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throw new Exception("Speexresampler didn't eat the whole array?");
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inbufpos = 0;
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//Buffer.BlockCopy(inbuf, (int)inal * 2 * sizeof(short), inbuf, 0, inbufpos - (int)inal * 2);
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//inbufpos -= (int)inal * 2;
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// dispatch outbuf
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drainer(outbuf, (int)outal);
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}
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public void Dispose()
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{
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LibSpeexDSP.speex_resampler_destroy(st);
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st = IntPtr.Zero;
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}
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void InternalDrain(short[] buf, int nsamp)
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{
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if (outbuf2pos + nsamp * 2 > outbuf2.Length)
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{
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short[] newbuf = new short[outbuf2pos + nsamp * 2];
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Buffer.BlockCopy(outbuf2, 0, newbuf, 0, outbuf2pos * sizeof(short));
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outbuf2 = newbuf;
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}
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Buffer.BlockCopy(buf, 0, outbuf2, outbuf2pos * sizeof(short), nsamp * 2 * sizeof(short));
|
|
outbuf2pos += nsamp * 2;
|
|
}
|
|
|
|
public void GetSamples(out short[] samples, out int nsamp)
|
|
{
|
|
if (input != null)
|
|
{
|
|
short[] sampin;
|
|
int nsampin;
|
|
input.GetSamples(out sampin, out nsampin);
|
|
EnqueueSamples(sampin, nsampin);
|
|
}
|
|
Flush();
|
|
nsamp = outbuf2pos / 2;
|
|
samples = outbuf2;
|
|
outbuf2pos = 0;
|
|
}
|
|
|
|
public void DiscardSamples()
|
|
{
|
|
outbuf2pos = 0;
|
|
}
|
|
}
|
|
}
|
|
|