| 1 | /* $Id: AudioMixBuffer.h 55920 2015-05-18 19:11:51Z vboxsync $ */
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| 2 | /** @file
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| 3 | * VBox audio: Mixing buffer to convert audio samples to/from different
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| 4 | * rates / formats.
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| 5 | */
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| 6 |
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| 7 | /*
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| 8 | * Copyright (C) 2014-2015 Oracle Corporation
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| 9 | *
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| 10 | * This file is part of VirtualBox Open Source Edition (OSE), as
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| 11 | * available from http://www.virtualbox.org. This file is free software;
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| 12 | * you can redistribute it and/or modify it under the terms of the GNU
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| 13 | * General Public License (GPL) as published by the Free Software
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| 14 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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| 15 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 16 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 17 | */
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| 18 |
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| 19 | #ifndef AUDIO_MIXBUF_H
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| 20 | #define AUDIO_MIXBUF_H
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| 21 |
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| 22 | #include <iprt/cdefs.h>
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| 23 | #include <VBox/vmm/pdmaudioifs.h>
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| 24 |
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| 25 | /** Constructs 32 bit value for given frequency, number of channels, bits per sample and signed bit.
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| 26 | * Note: This currently matches 1:1 the VRDE encoding -- this might change in the future, so better don't rely on this fact! */
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| 27 | #define AUDMIXBUF_AUDIO_FMT_MAKE(freq, c, bps, s) ((((s) & 0x1) << 28) + (((bps) & 0xFF) << 20) + (((c) & 0xF) << 16) + ((freq) & 0xFFFF))
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| 28 |
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| 29 | /** Decodes frequency (Hz). */
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| 30 | #define AUDMIXBUF_FMT_SAMPLE_FREQ(a) ((a) & 0xFFFF)
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| 31 | /** Decodes number of channels. */
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| 32 | #define AUDMIXBUF_FMT_CHANNELS(a) (((a) >> 16) & 0xF)
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| 33 | /** Decodes signed bit. */
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| 34 | #define AUDMIXBUF_FMT_SIGNED(a) (((a) >> 28) & 0x1)
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| 35 | /** Decodes number of bits per sample. */
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| 36 | #define AUDMIXBUF_FMT_BITS_PER_SAMPLE(a) (((a) >> 20) & 0xFF)
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| 37 | /** Decodes number of bytes per sample. */
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| 38 | #define AUDMIXBUF_FMT_BYTES_PER_SAMPLE(a) ((AUDMIXBUF_AUDIO_FMT_BITS_PER_SAMPLE(a) + 7) / 8)
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| 39 |
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| 40 | /** Converts samples to bytes. */
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| 41 | #define AUDIOMIXBUF_S2B(pBuf, samples) ((samples) << (pBuf)->cShift)
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| 42 | /** Converts samples to bytes, respecting the conversion ratio to
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| 43 | * a linked buffer. */
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| 44 | #define AUDIOMIXBUF_S2B_RATIO(pBuf, samples) ((((int64_t) samples << 32) / (pBuf)->iFreqRatio) << (pBuf)->cShift)
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| 45 | /** Converts bytes to samples, *not* taking the conversion ratio
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| 46 | * into account. */
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| 47 | #define AUDIOMIXBUF_B2S(pBuf, cb) (cb >> (pBuf)->cShift)
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| 48 | /** Converts number of samples according to the buffer's ratio. */
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| 49 | #define AUDIOMIXBUF_S2S_RATIO(pBuf, samples) (((int64_t) samples << 32) / (pBuf)->iFreqRatio)
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| 50 |
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| 51 |
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| 52 | int AudioMixBufAcquire(PPDMAUDIOMIXBUF pMixBuf, uint32_t cSamplesToRead, PPDMAUDIOSAMPLE *ppvSamples, uint32_t *pcSamplesRead);
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| 53 | inline uint32_t AudioMixBufBytesToSamples(PPDMAUDIOMIXBUF pMixBuf);
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| 54 | void AudioMixBufDestroy(PPDMAUDIOMIXBUF pMixBuf);
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| 55 | void AudioMixBufFinish(PPDMAUDIOMIXBUF pMixBuf, uint32_t cSamplesToClear);
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| 56 | uint32_t AudioMixBufFree(PPDMAUDIOMIXBUF pMixBuf);
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| 57 | uint32_t AudioMixBufFreeBytes(PPDMAUDIOMIXBUF pMixBuf);
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| 58 | int AudioMixBufInit(PPDMAUDIOMIXBUF pMixBuf, const char *pszName, PPDMPCMPROPS pProps, uint32_t cSamples);
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| 59 | bool AudioMixBufIsEmpty(PPDMAUDIOMIXBUF pMixBuf);
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| 60 | int AudioMixBufLinkTo(PPDMAUDIOMIXBUF pMixBuf, PPDMAUDIOMIXBUF pParent);
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| 61 | uint32_t AudioMixBufMixed(PPDMAUDIOMIXBUF pMixBuf);
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| 62 | int AudioMixBufMixToChildren(PPDMAUDIOMIXBUF pMixBuf, uint32_t cSamples, uint32_t *pcProcessed);
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| 63 | int AudioMixBufMixToParent(PPDMAUDIOMIXBUF pMixBuf, uint32_t cSamples, uint32_t *pcProcessed);
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| 64 | uint32_t AudioMixBufProcessed(PPDMAUDIOMIXBUF pMixBuf);
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| 65 | int AudioMixBufReadAt(PPDMAUDIOMIXBUF pMixBuf, uint32_t offSamples, void *pvBuf, uint32_t cbBuf, uint32_t *pcbRead);
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| 66 | int AudioMixBufReadAtEx(PPDMAUDIOMIXBUF pMixBuf, PDMAUDIOMIXBUFFMT enmFmt, uint32_t offSamples, void *pvBuf, uint32_t cbBuf, uint32_t *pcbRead);
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| 67 | int AudioMixBufReadCirc(PPDMAUDIOMIXBUF pMixBuf, void *pvBuf, uint32_t cbBuf, uint32_t *pcRead);
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| 68 | int AudioMixBufReadCircEx(PPDMAUDIOMIXBUF pMixBuf, PDMAUDIOMIXBUFFMT enmFmt, void *pvBuf, uint32_t cbBuf, uint32_t *pcRead);
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| 69 | void AudioMixBufReset(PPDMAUDIOMIXBUF pMixBuf);
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| 70 | void AudioMixBufSetVolume(PPDMAUDIOMIXBUF pMixBuf, PPDMAUDIOVOLUME pVol);
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| 71 | uint32_t AudioMixBufSize(PPDMAUDIOMIXBUF pMixBuf);
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| 72 | uint32_t AudioMixBufSizeBytes(PPDMAUDIOMIXBUF pMixBuf);
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| 73 | void AudioMixBufUnlink(PPDMAUDIOMIXBUF pMixBuf);
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| 74 | int AudioMixBufWriteAt(PPDMAUDIOMIXBUF pMixBuf, uint32_t offSamples, const void *pvBuf, uint32_t cbBuf, uint32_t *pcWritten);
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| 75 | int AudioMixBufWriteAtEx(PPDMAUDIOMIXBUF pMixBuf, PDMAUDIOMIXBUFFMT enmFmt, uint32_t offSamples, const void *pvBuf, uint32_t cbBuf, uint32_t *pcWritten);
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| 76 | int AudioMixBufWriteCirc(PPDMAUDIOMIXBUF pMixBuf, const void *pvBuf, uint32_t cbBuf, uint32_t *pcWritten);
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| 77 | int AudioMixBufWriteCircEx(PPDMAUDIOMIXBUF pMixBuf, PDMAUDIOMIXBUFFMT enmFmt, const void *pvBuf, uint32_t cbBuf, uint32_t *pcWritten);
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| 78 |
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| 79 | #endif /* AUDIO_MIXBUF_H */
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| 80 |
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