diff base/Resampler.cpp @ 297:c022976d18e8

* Merge from sv-match-alignment branch (excluding alignment-specific document).
  - add aggregate wave model (not yet complete enough to be added as a true
    model in a layer, but there's potential)
  - add play solo mode
  - add alignment model -- unused in plain SV
  - fix two plugin leaks
  - add m3u playlist support (opens all files at once, potentially hazardous)
  - fix retrieval of pre-encoded URLs
  - add ability to resample audio files on import, so as to match rates with
    other files previously loaded; add preference for same
  - add preliminary support in transform code for range and rate of transform
    input
  - reorganise preferences dialog, move dark-background option to preferences,
    add option for temporary directory location

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/base/Resampler.cpp	Fri Sep 28 13:56:38 2007 +0000
@@ -0,0 +1,186 @@
+/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */
+/*
+    Sonic Visualiser
+    An audio file viewer and annotation editor.
+    Centre for Digital Music, Queen Mary, University of London.
+    
+    This program is free software; you can redistribute it and/or
+    modify it under the terms of the GNU General Public License as
+    published by the Free Software Foundation; either version 2 of the
+    License, or (at your option) any later version.  See the file
+    COPYING included with this distribution for more information.
+*/
+
+/*
+   This is a modified version of a source file from the 
+   Rubber Band audio timestretcher library.
+   This file copyright 2007 Chris Cannam.
+*/
+
+#include "Resampler.h"
+
+#include <cstdlib>
+#include <cmath>
+
+#include <iostream>
+
+#include <samplerate.h>
+
+class Resampler::D
+{
+public:
+    D(Quality quality, size_t channels, size_t chunkSize);
+    ~D();
+
+    size_t resample(float **in, float **out,
+                    size_t incount, float ratio,
+                    bool final);
+
+    size_t resampleInterleaved(float *in, float *out,
+                               size_t incount, float ratio,
+                               bool final);
+
+    void reset();
+
+protected:
+    SRC_STATE *m_src;
+    float *m_iin;
+    float *m_iout;
+    size_t m_channels;
+    size_t m_iinsize;
+    size_t m_ioutsize;
+};
+
+Resampler::D::D(Quality quality, size_t channels, size_t chunkSize) :
+    m_src(0),
+    m_iin(0),
+    m_iout(0),
+    m_channels(channels),
+    m_iinsize(0),
+    m_ioutsize(0)
+{
+    int err = 0;
+    m_src = src_new(quality == Best ? SRC_SINC_BEST_QUALITY :
+                    quality == Fastest ? SRC_LINEAR :
+                    SRC_SINC_FASTEST,
+                    channels, &err);
+
+    //!!! check err, throw
+
+    if (chunkSize > 0 && m_channels > 1) {
+        //!!! alignment?
+        m_iinsize = chunkSize * m_channels;
+        m_ioutsize = chunkSize * m_channels * 2;
+        m_iin = (float *)malloc(m_iinsize * sizeof(float));
+        m_iout = (float *)malloc(m_ioutsize * sizeof(float));
+    }
+}
+
+Resampler::D::~D()
+{
+    src_delete(m_src);
+    if (m_iinsize > 0) {
+        free(m_iin);
+    }
+    if (m_ioutsize > 0) {
+        free(m_iout);
+    }
+}
+
+size_t
+Resampler::D::resample(float **in, float **out,
+                       size_t incount, float ratio,
+                       bool final)
+{
+    if (m_channels == 1) {
+        return resampleInterleaved(*in, *out, incount, ratio, final);
+    }
+
+    size_t outcount = lrintf(ceilf(incount * ratio));
+
+    if (incount * m_channels > m_iinsize) {
+        m_iinsize = incount * m_channels;
+        m_iin = (float *)realloc(m_iin, m_iinsize * sizeof(float));
+    }
+    if (outcount * m_channels > m_ioutsize) {
+        m_ioutsize = outcount * m_channels;
+        m_iout = (float *)realloc(m_iout, m_ioutsize * sizeof(float));
+    }
+    for (size_t i = 0; i < incount; ++i) {
+        for (size_t c = 0; c < m_channels; ++c) {
+            m_iin[i * m_channels + c] = in[c][i];
+        }
+    }
+    
+    size_t gen = resampleInterleaved(m_iin, m_iout, incount, ratio, final);
+
+    for (size_t i = 0; i < gen; ++i) {
+        for (size_t c = 0; c < m_channels; ++c) {
+            out[c][i] = m_iout[i * m_channels + c];
+        }
+    }
+
+    return gen;
+}
+
+size_t
+Resampler::D::resampleInterleaved(float *in, float *out,
+                                  size_t incount, float ratio,
+                                  bool final)
+{
+    SRC_DATA data;
+
+    size_t outcount = lrintf(ceilf(incount * ratio));
+
+    data.data_in = in;
+    data.data_out = out;
+    data.input_frames = incount;
+    data.output_frames = outcount;
+    data.src_ratio = ratio;
+    data.end_of_input = (final ? 1 : 0);
+
+    int err = src_process(m_src, &data);
+
+    //!!! check err, respond appropriately
+
+    return data.output_frames_gen;
+}
+
+void
+Resampler::D::reset()
+{
+    src_reset(m_src);
+}
+
+Resampler::Resampler(Quality quality, size_t channels, size_t chunkSize)
+{
+    m_d = new D(quality, channels, chunkSize);
+}
+
+Resampler::~Resampler()
+{
+    delete m_d;
+}
+
+size_t 
+Resampler::resample(float **in, float **out,
+                    size_t incount, float ratio,
+                    bool final)
+{
+    return m_d->resample(in, out, incount, ratio, final);
+}
+
+size_t 
+Resampler::resampleInterleaved(float *in, float *out,
+                    size_t incount, float ratio,
+                    bool final)
+{
+    return m_d->resampleInterleaved(in, out, incount, ratio, final);
+}
+
+void
+Resampler::reset()
+{
+    m_d->reset();
+}
+