* Driver for USB Audio Device Class devices.
* Copyright (c) 2009-13 S.Zharski <imker@gmx.li>
* Distributed under the terms of the MIT license.
*
*/
#ifndef _USB_AUDIO_STREAM_H_
#define _USB_AUDIO_STREAM_H_
#include "AudioStreamingInterface.h"
class Device;
class Stream : public AudioStreamingInterface {
friend class Device;
public:
Stream(Device* device, size_t interface,
usb_interface_list* List);
~Stream();
status_t Init();
status_t InitCheck() { return fStatus; }
status_t Start();
status_t Stop();
bool IsRunning() { return fIsRunning; }
void OnRemove();
status_t GetBuffers(multi_buffer_list* List);
status_t OnSetConfiguration(usb_device device,
const usb_configuration_info* config);
bool ExchangeBuffer(multi_buffer_info* Info);
status_t GetEnabledChannels(uint32& offset,
multi_channel_enable* Enable);
status_t SetEnabledChannels(uint32& offset,
multi_channel_enable* Enable);
status_t GetGlobalFormat(multi_format_info* Format);
status_t SetGlobalFormat(multi_format_info* Format);
protected:
Device* fDevice;
status_t fStatus;
usb_pipe fStreamEndpoint;
bool fIsRunning;
area_id fArea, fKernelArea;
size_t fAreaSize;
usb_iso_packet_descriptor* fDescriptors;
size_t fDescriptorsCount;
uint8* fBuffers;
uint8* fKernelBuffers;
size_t fCurrentBuffer;
size_t fSamplesCount;
bigtime_t fRealTime;
uint32 fStartingFrame;
int32 fProcessedBuffers;
int32 fInsideNotify;
private:
status_t _ChooseAlternate();
status_t _SetupBuffers();
status_t _QueueNextTransfer(size_t buffer, bool start);
static void _TransferCallback(void* cookie, status_t status,
void* data, size_t actualLength);
void _DumpDescriptors();
};
#endif
