alsa_audio_render.h

audio-video-codecs.rar语音编解码器

/*
//
//                  INTEL CORPORATION PROPRIETARY INFORMATION
//     This software is supplied under the terms of a license agreement or
//     nondisclosure agreement with Intel Corporation and may not be copied
//     or disclosed except in accordance with the terms of that agreement.
//          Copyright(c) 2007 Intel Corporation. All Rights Reserved.
//
*/

#ifndef __ALSA_AUDIO_RENDER_H__
#define __ALSA_AUDIO_RENDER_H__

#include "umc_defs.h"

#ifdef UMC_ENABLE_ALSA_AUDIO_RENDER

#include "umc_structures.h"
#include "basic_audio_render.h"
#include <alsa/asoundlib.h>

#define ALSA_BUFFER_TIME  500000  /*** size in us of the ring buffer ***/
#define ALSA_PERIOD_TIME  100000  /*** transfer time period between app and driver ***/

namespace UMC
{
    class ALSAAudioRender :public BasicAudioRender
    {
    public:
        ALSAAudioRender();
        virtual ~ALSAAudioRender() {   Close();     }

        virtual Status Init(MediaReceiverParams* pInit);
        virtual Status SendFrame(MediaData* in);
        virtual Status Pause(bool pause);

        // Render manipulating
        // 0-silence 1-max, return previous volume
        virtual Ipp32f SetVolume(Ipp32f volume);
        virtual Ipp32f GetVolume();

        virtual Status Close (void);
        virtual Status Reset (void);

        virtual Status SetParams(MediaReceiverParams *params,
                                 Ipp32u trickModes = UMC_TRICK_MODES_NO);

    protected:
        virtual Ipp64f GetTimeTick(void);
        virtual Status DrainBuffer();

        Ipp64f              m_dfStartPTS;
        vm_tick             m_tickStartTime;
        vm_tick             m_tickPrePauseTime;

        snd_pcm_t           *m_pPCMHandle;
        snd_pcm_hw_params_t *m_pHWParams;
        char                *m_pPCMDevice;
    };
};  //  namespace UMC

#endif // UMC_ENABLE_ALSA_AUDIO_RENDER

#endif // __ALSA_AUDIO_RENDER_H__