1 files changed, 74 insertions, 0 deletions

diff --git a/src/audio/buf.h b/src/audio/buf.h
new file mode 100644
index 00000000..de123481
--- /dev/null
+++ b/src/audio/buf.h
@@ -0,0 +1,74 @@
+/* Copyright 2020 Jaakko Keränen <jaakko.keranen@iki.fi>
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+1. Redistributions of source code must retain the above copyright notice, this
+   list of conditions and the following disclaimer.
+2. Redistributions in binary form must reproduce the above copyright notice,
+   this list of conditions and the following disclaimer in the documentation
+   and/or other materials provided with the distribution.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
+ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
+
+#pragma once
+
+#include "the_Foundation/block.h"
+#include "the_Foundation/mutex.h"
+
+#include <SDL_audio.h>
+
+iDeclareType(InputBuf)
+iDeclareType(SampleBuf)
+
+#if !defined (AUDIO_S24LSB)
+#   define AUDIO_S24LSB     0x8018  /* 24-bit integer samples */
+#endif
+#if !defined (AUDIO_F64LSB)
+#   define AUDIO_F64LSB     0x8140  /* 64-bit floating point samples */
+#endif
+
+struct Impl_InputBuf {
+    iMutex     mtx;
+    iCondition changed;
+    iBlock     data;
+    iBool      isComplete;
+};
+
+iDeclareTypeConstruction(InputBuf)
+
+size_t  size_InputBuf   (const iInputBuf *);
+
+/*----------------------------------------------------------------------------------------------*/
+
+struct Impl_SampleBuf {
+    SDL_AudioFormat format;
+    uint8_t         numChannels;
+    uint8_t         sampleSize; /* as bytes; one sample includes values for all channels */
+    void *          data;
+    size_t          count;
+    size_t          head, tail;
+    iCondition      moreNeeded;
+};
+
+iDeclareTypeConstructionArgs(SampleBuf, SDL_AudioFormat format, size_t numChannels, size_t count)
+
+size_t  size_SampleBuf      (const iSampleBuf *);
+iBool   isFull_SampleBuf    (const iSampleBuf *);
+size_t  vacancy_SampleBuf   (const iSampleBuf *);
+
+iLocalDef void *ptr_SampleBuf_(iSampleBuf *d, size_t pos) {
+    return ((char *) d->data) + (d->sampleSize * pos);
+}
+
+void    write_SampleBuf     (iSampleBuf *, const void *samples, const size_t n);
+void    read_SampleBuf      (iSampleBuf *, const size_t n, void *samples_out);