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// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//
// AlsaWrapper is a simple stateless class that wraps the alsa library commands
// we want to use. It's purpose is to allow injection of a mock so that the
// higher level code is testable.
#include <alsa/asoundlib.h>
#include "base/basictypes.h"
class AlsaWrapper {
public:
AlsaWrapper();
virtual ~AlsaWrapper();
virtual int DeviceNameHint(int card, const char* iface, void*** hints);
virtual char* DeviceNameGetHint(const void* hint, const char* id);
virtual int DeviceNameFreeHint(void** hints);
virtual int PcmOpen(snd_pcm_t** handle, const char* name,
snd_pcm_stream_t stream, int mode);
virtual int PcmClose(snd_pcm_t* handle);
virtual int PcmPrepare(snd_pcm_t* handle);
virtual int PcmDrop(snd_pcm_t* handle);
virtual int PcmDelay(snd_pcm_t* handle, snd_pcm_sframes_t* delay);
virtual snd_pcm_sframes_t PcmWritei(snd_pcm_t* handle,
const void* buffer,
snd_pcm_uframes_t size);
virtual snd_pcm_sframes_t PcmReadi(snd_pcm_t* handle,
void* buffer,
snd_pcm_uframes_t size);
virtual int PcmRecover(snd_pcm_t* handle, int err, int silent);
virtual int PcmSetParams(snd_pcm_t* handle, snd_pcm_format_t format,
snd_pcm_access_t access, unsigned int channels,
unsigned int rate, int soft_resample,
unsigned int latency);
virtual int PcmGetParams(snd_pcm_t* handle, snd_pcm_uframes_t* buffer_size,
snd_pcm_uframes_t* period_size);
virtual const char* PcmName(snd_pcm_t* handle);
virtual snd_pcm_sframes_t PcmAvailUpdate(snd_pcm_t* handle);
virtual snd_pcm_state_t PcmState(snd_pcm_t* handle);
virtual int PcmStart(snd_pcm_t* handle);
virtual const char* StrError(int errnum);
private:
int ConfigureHwParams(snd_pcm_t* handle, snd_pcm_hw_params_t* hw_params,
snd_pcm_format_t format, snd_pcm_access_t access,
unsigned int channels, unsigned int rate,
int soft_resample, unsigned int latency);
DISALLOW_COPY_AND_ASSIGN(AlsaWrapper);
};
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