From 365bdb755c23145dd3f4ea4dfe9912498abd05e3 Mon Sep 17 00:00:00 2001
From: Ralf Ramsauer <ralf@ramses-pyramidenbau.de>
Date: Sun, 11 Oct 2015 19:06:05 +0200
Subject: [PATCH] Added new Class for playing WAVE files from memory

Signed-off-by: Ralf Ramsauer <ralf@ramses-pyramidenbau.de>
---
 doorlockd/client/wave.cpp | 86 +++++++++++++++++++++++++++++++++++++++
 doorlockd/client/wave.h   | 35 ++++++++++++++++
 2 files changed, 121 insertions(+)
 create mode 100644 doorlockd/client/wave.cpp
 create mode 100644 doorlockd/client/wave.h

diff --git a/doorlockd/client/wave.cpp b/doorlockd/client/wave.cpp
new file mode 100644
index 0000000..d7cfbe0
--- /dev/null
+++ b/doorlockd/client/wave.cpp
@@ -0,0 +1,86 @@
+#include <cstring>
+#include <fstream>
+#include <stdexcept>
+
+#include <sndfile.h>
+
+#include "wave.h"
+
+Wave::Wave(int bits,
+           int channels,
+           int rate,
+           Raw data) :
+    _format(new ao_sample_format),
+    _data(data)
+{
+    _format->bits = bits;
+    _format->rate = rate;
+    _format->channels = channels;
+    _format->byte_format = AO_FMT_LITTLE;
+    _format->matrix = nullptr;
+
+    int default_driver;
+    default_driver = ao_default_driver_id();
+    _device = ao_open_live(default_driver,
+                           _format.get(),
+                           nullptr);
+}
+
+Wave::~Wave()
+{
+    if (_device != nullptr)
+        ao_close(_device);
+}
+
+Wave Wave::fromFile(const std::string &filename)
+{
+    SF_INFO sfinfo;
+    SNDFILE *file = sf_open(filename.c_str(), SFM_READ, &sfinfo);
+    if (file == nullptr)
+        throw std::runtime_error("Unable to open soundfile " + filename);
+
+    size_t rawSize = sfinfo.channels * sfinfo.frames * sizeof(short);
+    Raw data;
+    data.resize(rawSize);
+
+    sf_read_raw(file, &data.front(), data.size());
+    sf_close(file);
+
+    int bits;
+    switch (sfinfo.format & SF_FORMAT_SUBMASK) {
+        case SF_FORMAT_PCM_16:
+            bits = 16;
+            break;
+        case SF_FORMAT_PCM_24:
+            bits = 24;
+            break;
+        case SF_FORMAT_PCM_32:
+            bits = 32;
+            break;
+        case SF_FORMAT_PCM_S8:
+            bits = 8;
+            break;
+        case SF_FORMAT_PCM_U8:
+            bits = 8;
+            break;
+        default:
+            bits = 16;
+            break;
+    }
+
+    return Wave(bits,
+                sfinfo.channels,
+                sfinfo.samplerate,
+                data);
+}
+
+void Wave::play() const
+{
+    if (_device == nullptr) {
+        return;
+    }
+
+    ao_play(_device,
+            (char*)&_data.front(),
+            _data.size());
+}
diff --git a/doorlockd/client/wave.h b/doorlockd/client/wave.h
new file mode 100644
index 0000000..b60560c
--- /dev/null
+++ b/doorlockd/client/wave.h
@@ -0,0 +1,35 @@
+#ifndef WAVE_H
+#define WAVE_H
+
+#include <string>
+#include <vector>
+#include <memory>
+
+#include <ao/ao.h>
+
+class Wave {
+public:
+
+    using Raw = std::vector<char>;
+
+    static Wave fromFile(const std::string &filename);
+    Wave(int bits,
+         int channels,
+         int rate,
+         Raw data);
+    Wave(const Wave &rhs);
+    ~Wave();
+
+    Wave &operator=(const Wave &rhs);
+
+    void play() const;
+
+private:
+
+    std::unique_ptr<ao_sample_format> _format;
+    ao_device* _device = { nullptr };
+
+    const Raw _data;
+};
+
+#endif