之前对android音频方面根本不了解,找了很多博客都没找到合适自己的,顺便看了很多代码,发现pcm基本上所有的音频格式都能转, 我项目里面用到的就是wav的,所以这里贴一下pcm转wav的代码, 之前看到一位大佬说wav的头文件很简单,反正我是没看懂,菜得哭..... 顺便祝涵宝宝新年快乐~么么哒 /** * PCM文件转WAV文件 * * @param inPcmFilePath 输入PCM文件路径 * @param outWavFilePath 输出WAV文件路径 * @param sampleRate 采样率,例如15000 * @param channels 声道数 单声道:1或双声道:2 * @param bitNum 采样位数,8或16 */ public static void convertPcmToWav(String inPcmFilePath, String outWavFilePath, int sampleRate, int channels, int bitNum) { FileInputStream in = null; FileOutputStream out = null; byte[] data = new byte[1024]; try { //采样字节byte率 long byteRate = sampleRate * channels * bitNum / 8; in = new FileInputStream(inPcmFilePath); out = new FileOutputStream(outWavFilePath); //PCM文件大小 long totalAudioLen = in.getChannel().size(); //总大小,由于不包括RIFF和WAV,所以是44 - 8 = 36,在加上PCM文件大小 long totalDataLen = totalAudioLen + 36; writeWaveFileHeader(out, totalAudioLen, totalDataLen, sampleRate, channels, byteRate); int length = 0; while ((length = in.read(data)) > 0) { out.write(data, 0, length); } } catch (Exception e) { e.printStackTrace(); } finally { if (in != null) { try { in.close(); } catch (IOException e) { e.printStackTrace(); } } if (out != null) { try { out.close(); } catch (IOException e) { e.printStackTrace(); } } } } /** * 输出WAV文件 * * @param out WAV输出文件流 * @param totalAudioLen 整个音频PCM数据大小 * @param totalDataLen 整个数据大小 * @param sampleRate 采样率 * @param channels 声道数 * @param byteRate 采样字节byte率 * @throws IOException */ private static void writeWaveFileHeader(FileOutputStream out, long totalAudioLen, long totalDataLen, int sampleRate, int channels, long byteRate) throws IOException { byte[] header = new byte[44]; header[0] = 'R'; // RIFF header[1] = 'I'; header[2] = 'F'; header[3] = 'F'; header[4] = (byte) (totalDataLen & 0xff);//数据大小 header[5] = (byte) ((totalDataLen >> 8) & 0xff); header[6] = (byte) ((totalDataLen >> 16) & 0xff); header[7] = (byte) ((totalDataLen >> 24) & 0xff); header[8] = 'W';//WAVE header[9] = 'A'; header[10] = 'V'; header[11] = 'E'; //FMT Chunk header[12] = 'f'; // 'fmt ' header[13] = 'm'; header[14] = 't'; header[15] = ' ';//过渡字节 //数据大小 header[16] = 16; // 4 bytes: size of 'fmt ' chunk header[17] = 0; header[18] = 0; header[19] = 0; //编码方式 10H为PCM编码格式 header[20] = 1; // format = 1 header[21] = 0; //通道数 header[22] = (byte) channels; header[23] = 0; //采样率,每个通道的播放速度 header[24] = (byte) (sampleRate & 0xff); header[25] = (byte) ((sampleRate >> 8) & 0xff); header[26] = (byte) ((sampleRate >> 16) & 0xff); header[27] = (byte) ((sampleRate >> 24) & 0xff); //音频数据传送速率,采样率*通道数*采样深度/8 header[28] = (byte) (byteRate & 0xff); header[29] = (byte) ((byteRate >> 8) & 0xff); header[30] = (byte) ((byteRate >> 16) & 0xff); header[31] = (byte) ((byteRate >> 24) & 0xff); // 确定系统一次要处理多少个这样字节的数据,确定缓冲区,通道数*采样位数 header[32] = (byte) (channels * 16 / 8); header[33] = 0; //每个样本的数据位数 header[34] = 16; header[35] = 0; //Data chunk header[36] = 'd';//data header[37] = 'a'; header[38] = 't'; header[39] = 'a'; header[40] = (byte) (totalAudioLen & 0xff); header[41] = (byte) ((totalAudioLen >> 8) & 0xff); header[42] = (byte) ((totalAudioLen >> 16) & 0xff); header[43] = (byte) ((totalAudioLen >> 24) & 0xff); out.write(header, 0, 44); }
标签:文件,totalAudioLen,param,sampleRate,header,Android,0xff,byte,android From: https://www.cnblogs.com/opensmarty/p/17125705.html