從wav轉換.mp3使用Lame庫在Android

Question

我使用Lame時遇到了一個難題，我需要你的幫助。 我正在使用LAME（版本3.9.9.5）我的設備進行調試是三星銀河s2（操作系統的Android 4.0）。 我錄製並獲得3ga文件，然後重命名爲.wav文件，然後使用LAME配置爲mp3文件。 我得到了mp3文件，但當我播放它不正確的文件（只是zet zet）和比原始的wav文件的射手。 這是我的mp3ConvertFIle： `public static final int NUM_CHANNELS = 2; // public static final int SAMPLE_RATE = 16000; public static final int SAMPLE_RATE = 48000; public static final int BITRATE = 128; public static final int MODE = 1; public static final int QUALITY = 2; static靜態{System.loadLibrary（「mp3lame」）; }

private native void initEncoder(int numChannels, int sampleRate, 
     int bitRate, int mode, int quality); 

private native void destroyEncoder(); 

private native int encodeFile(String sourcePath, String targetPath); 

private native int wavToMp3(String src, String dest, String quality, 
     String bitrate); 

/** 
* Convert a WAV file to MP3 
* 
* @param src 
*   path to WAV file 
* @param dest 
*   path to MP3 file 
*/ 
public void convert(String src, String dest) { 
    initEncoder(NUM_CHANNELS, SAMPLE_RATE, BITRATE, MODE, QUALITY); 
    encodeFile(src, dest); 
}` 

，這是我wrapper.c文件：

#include "stdio.h" 
#include "stdlib.h" 
#include "jni.h" 
#include "android/log.h" 
#include "libmp3lame/lame.h" 
#define BUFFER_SIZE 8192 
#define be_short(s) ((short) ((unsigned short) (s) << 8) | ((unsigned short) (s) >> 8)) 
#define LOG_TAG "LAME ENCODER" 
#define LOGD(format, args...) __android_log_print(ANDROID_LOG_DEBUG, LOG_TAG, format, ##args); 

lame_t lame; 

int read_samples(FILE *input_file, short *input) { 
    int nb_read; 
    nb_read = fread(input, 1, sizeof(short), input_file)/sizeof(short); 

    int i = 0; 
    while (i < nb_read) { 
     input[i] = be_short(input[i]); 
     i++; 
    } 

    return nb_read; 
} 

void Java_com_dao_smsring_utility_MP3Converter_initEncoder(JNIEnv *env, 
     jobject jobj, jint in_num_channels, jint in_samplerate, jint in_brate, 
     jint in_mode, jint in_quality) { 
    lame = lame_init(); 
    lame_set_num_channels(lame, in_num_channels); 
    lame_set_in_samplerate(lame, in_samplerate); 
    lame_set_out_samplerate(lame, 48000); 
    lame_set_brate(lame, in_brate); 
    lame_set_mode(lame, in_mode); 
    lame_set_quality(lame, in_quality); 
    int res = lame_init_params(lame); 
    LOGD("version of %s is",get_lame_version()); 
} 

void Java_com_dao_smsring_utility_MP3Converter_destroyEncoder(
     JNIEnv *env, jobject jobj) { 
    int res = lame_close(lame); 
} 


void Java_com_dao_smsring_utility_MP3Converter_encodeFile(JNIEnv *env, 
     jobject jobj, jstring in_source_path, jstring in_target_path) { 
    const char *source_path, *target_path; 
    source_path = (*env)->GetStringUTFChars(env, in_source_path, NULL); 
    target_path = (*env)->GetStringUTFChars(env, in_target_path, NULL); 

    FILE *input_file, *output_file; 
    input_file = fopen(source_path, "rb"); 
    output_file = fopen(target_path, "wb"); 

    short input[BUFFER_SIZE]; 
    char output[BUFFER_SIZE]; 
    int nb_read = 0; 
    int nb_write = 0; 
    int nb_total = 0; 

    while (nb_read = read_samples(input_file, input)) { 
     nb_write = lame_encode_buffer(lame, input, input, nb_read, output, 
       BUFFER_SIZE); 
     fwrite(output, nb_write, 1, output_file); 
     nb_total += nb_write; 
    } 
    LOGD(" total read %d is",nb_total); 
    nb_write = lame_encode_flush(lame, output, BUFFER_SIZE); 
// fwrite(output, nb_write, 1, output_file); 

    LOGD(" total write %d is",nb_write); 
    lame_mp3_tags_fid(lame,output_file); 

    lame_close(lame); 
    fclose(input_file); 
    fclose(output_file); 
} 

我不知道爲什麼？請幫幫我。 非常感謝。 我的gmail：gunblackcatxiii@gmail.com 希望能得到您的支持

Answer 1

要錄製wav文件，使用pcm音頻編解碼器捕捉可能與3ga使用amr。

要使用拉梅在Android中，我會建議你這個link