android audiotrack 播放pcm

 

 

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <media/AudioTrack.h>

#include "xpcm_track.h"

using namespace android;

int main(int argc, char ** argv)
{
    int  frame_count;
    size_t buffer_size = 4096;
    status_t res = 0;
        
    FILE *fd = NULL;
    sp<AudioTrack>    mAudioTrack;
    uint8_t           audioBuff[4096];
    
    (void)argc;
    (void)argv;

    mAudioTrack = new AudioTrack();
    if (mAudioTrack == NULL) {
        return -1;
    }

    AudioTrack::getMinFrameCount(&frame_count, AUDIO_STREAM_MUSIC, 48000);
    res = mAudioTrack->set(AUDIO_STREAM_MUSIC, 48000, AUDIO_FORMAT_PCM_16_BIT, AUDIO_CHANNEL_OUT_STEREO, frame_count,
                           AUDIO_OUTPUT_FLAG_NONE,
                           NULL,
                           NULL,
                           0,
                           0,
                           0,
                           0);
    printf("mAudioTrack->set() frame_count=%d res=%d\n", frame_count, res);
    
    mAudioTrack->start();
    mAudioTrack->initCheck();

    fd = fopen("/data/test.pcm", "rb");
    
    while (true) {

        if (buffer_size != fread(audioBuff, 1, buffer_size, fd)) {
            printf("fread() res=%d\n", buffer_size);
            break;
        }
        res = mAudioTrack->write(audioBuff, buffer_size);
        if (buffer_size != res) {
            printf("mAudioTrack->write() res=%d\n", res);
        }
    }

    mAudioTrack->stop();
    fclose(fd);
    return 0;
}

 

Android.mk

 

LOCAL_PATH:= $(call my-dir)
include $(CLEAR_VARS)

LOCAL_SRC_FILES:=  \
	xpcm_track.cpp

LOCAL_SHARED_LIBRARIES := \
	libutils libmedia


# FIXME The duplicate audioflinger is temporary
LOCAL_C_INCLUDES := \
    frameworks/av/include/

LOCAL_MODULE:= xpcmtrack
include $(BUILD_EXECUTABLE)

 

 

附件是測試的 pcm

 

 

48000, AUDIO_FORMAT_PCM_16_BIT, AUDIO_CHANNEL_OUT_STEREO 這3個參數要根據實際情況調整。