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android - 如何从 Android 中的多个声音 block 创建单个声音文件

转载 作者:行者123 更新时间:2023-12-03 02:00:43 25 4
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我正在创建一个鼓应用程序,我必须在其中做两件事

  • 播放各种声音
  • 如果用户选择录制声音,我必须制作用户播放过的任何音乐的音频文件

  • 该应用程序的工作原理是这样的 -
    当用户点击按钮 A 时,我播放 SoundA。如果用户点击 B,我会播放 SoundB,同样...

    因此,要播放而不是录制声音,我在想的是,当用户单击“开始录制”按钮时-
    如果我保持用户单击按钮的时间戳,我可以通过混合我已经拥有的声音来重现质量更好的最终输出。

    例如用户在 00:01 秒按下按钮 A,在 00:05 秒按下按钮 B,依此类推

    我不确定的是 - 如何创建音频文件并在特定时间段插入这些声音,即声音 A 在 00:01 秒,声音 B 在 00:05 秒......依此类推。

    对此的任何帮助都会有很大帮助。

    先感谢您。

    最佳答案

    两部分答案:

    解决方案一 :想到的一个想法是,与其尝试录制生成的音频,不如录制他们按下的按钮,并在他们播放文件时重新创建序列。

    所以你的“录音”文件会是这样的:

  • A 0001(1 秒播放 A)
  • B 0005
  • A 0006(添加更多我的
    自己)
  • C 0008
  • ...
  • B 0194(使用纯秒而不是分钟/秒)

  • 因此,当他们想要播放“录音”时,您可以设置一个计时器,等待适当的时间,然后播放适当的声音。因此,对于我上面的示例,您将:
  • 等待一秒钟,播放声音 A
  • 再等四秒钟,播放声音 B
  • 再等一秒,再播放A音
  • 等待两秒钟,播放声音 C

  • 解决方案二 :如果您希望能够将录音导出到您的应用程序之外,这将更合适,因此需要一个真实的音频文件。

    这假设您拥有原始格式的声音(此处可以使用 WAV,但必须先解码 MP3 或其他格式)。这还假设所有声音在样本/秒、立体声/单声道、8 位/16 位样本等方面都是一致的。然后当它们完成录制时,分配一个适当的数组(或两个,如果你做立体声)尺寸。因此,如果录制时间为 11 秒,并且您的声音是 44100 样本/秒的 16 位单声道,则您分配一个由 485100 个短片组成的数组(485100=11*44100)。如果它太大,那么您可能需要在较短的 fragment 中执行此操作(例如一次一秒),并准备好让您的声音在 fragment 之间交叉。 16 位值是有符号的短裤,因此您应该能够将数组初始化为 0,并在适当的位置添加每个声音。请注意,8 位值是无符号的,带有偏移量,因此您必须在添加样本时调整偏移量。然后以某种格式写入文件(可能是 WAV,参见 http://www-mmsp.ece.mcgill.ca/documents/AudioFormats/WAVE/WAVE.html 了解 WAV 文件格式的说明)。如果您希望文件是 MP3 或其他压缩格式,几乎可以肯定有一些类(class)可以为您进行压缩,但在这方面我帮不了您太多。

    编辑:创建 .WAV 文件的代码示例(在 C for Windows 中):
    /* Create a .WAV file with a specified set of chirps */
    #include<stdio.h>
    #include<sys\stat.h>
    #include<ctype.h>

    /* length of one bit in 44100Hz units */
    #define BIT_LEN 88.5

    /* length of one half-cycle */
    #define HALF_CYCLE (BIT_LEN/8)

    /* samples per second */
    #define SAMP_RATE 44100

    /* seconds before chirps start */
    #define LEAD_SILENCE 5

    struct {
    unsigned long ID; /* FILE ID "RIFF" */
    unsigned long Len; /* file length (excluding 8-byte header) */
    unsigned long DataType; /* Data type 'WAVE' (start of main file) */
    } FileHeader;

    struct {
    unsigned long ID; /* chunk ID "DATA" */
    unsigned long Len; /* chunk length */
    } DataHeader;

    struct {
    unsigned long ID; /* chunk ID "FMT " */
    unsigned long Len; /* chunk length */
    short FormatTag; /* format (1 if uncompressed) */
    unsigned short Channels; /* # of channels (mono, stereo, etc) */
    unsigned long SampPerSec; /* # of samples per second */
    unsigned long AvgBytesPerSec; /* # of bytes played per second */
    unsigned short BlockAlign; /* Size of a 'frame' in bytes */
    unsigned short BitsPerSamp; /* bits per sample */
    } FormatHeader;

    #define ID_RIFF 0x46464952 /* 'RIFF' (FFIR) */
    #define ID_WAVE 0x45564157 /* 'WAVE' (EVAW) */
    #define ID_DATA 0x61746164 /* 'data' (atad) */
    #define ID_FMT 0x20746d66 /* 'fmt ' ( tmf)*/

    /* count # of pos/negative parts done */
    int pcount=0;
    /* how many will fit on a normal line? */
    #define PCOUNT_MAX 14

    void disp_id( char * lbl, long ID )
    {
    union {
    long l;
    char c[6];
    } u;

    u.l = ID;
    u.c[4] = 0;

    printf( lbl, u.c );
    }

    /* note where the samples begin */
    unsigned long SampleStart; /* where do samples begin? */

    /* one-second chirp segment */

    short NewChirp[SAMP_RATE], /* 1-second block with chirp */
    Silence[SAMP_RATE]; /* 1-second silence */

    /* insert a byte into the chirp */
    /* location is specified in bit time units */
    void insert_byte( int location, int value )
    {
    int i, j;
    int data; /* value to write to item */
    int dloc; /* where we are within the byte */
    int cycle;

    printf("Inserting byte %d", value);

    /* insert bits in little-endian order */
    data = (value<<2) + 2; /* add "10" to the number */

    /* round cycle low/high times to 11 samples low, 11 samples high */
    /* use BIT_LEN to put it in the proper place */
    for( i=0; i<10; i++ )
    if ( data & (1<<i) )
    {
    printf(" %d: ", i );

    /* have a 1-bit to insert, where should it be? */
    /* insert 4 cycles */
    for( cycle=0; cycle<4; cycle++ )
    {
    /* note: this may leave 0 samples between cycles or bits */
    dloc = (int)(location + i*BIT_LEN + cycle*(BIT_LEN/4) + 0.5);
    printf(" %d", dloc );

    /* insert 11 low samples */
    for( j=0; j<11; j++ )
    {
    NewChirp[ dloc+j ] = -30000;
    }

    /* insert 11 high samples */
    for( j=11; j<22; j++ )
    {
    NewChirp[ dloc+j ] = 30000;
    }
    }
    }

    printf("\n");
    } /* insert_byte */

    /* insert a chirp with the given value */
    void insert_chirp( FILE *f, float speed, float incline )
    {
    int i, i_speed, i_incline, i_chksum;

    /* convert values to integers */
    i_speed = (int)( speed*10 + 0.5 );
    i_incline = (int)( incline*10 + 0.5 );
    i_chksum = (i_speed + i_incline) & 0x0ff;

    /* set everything to 0 in advance */
    memset( NewChirp, 0, SAMP_RATE );

    /* start inserting chirp parts */
    insert_byte( 0, i_speed );
    insert_byte( (int)(10*BIT_LEN+0.5), i_incline );
    insert_byte( (int)(20*BIT_LEN+0.5), i_chksum );
    insert_byte( (int)(40*BIT_LEN+0.5), i_speed );
    insert_byte( (int)(50*BIT_LEN+0.5), i_incline );
    insert_byte( (int)(60*BIT_LEN+0.5), i_chksum );

    /* write the chirp */
    fwrite( NewChirp, 1, SAMP_RATE, f );
    } /* insert_chirp */

    /* maximum # of chirps per file we will permit */
    #define CHIRP_MAX 50

    int main(int argc, char *argv[])
    {
    FILE *f; /* workout information file */
    FILE *audio; /* output WAV file */

    /* hold information about the chirps */
    struct {
    int second_count; /* where does this occur in seconds */
    float speed; /* speed to use */
    float incline; /* treadmill incline */
    } chirp_list[CHIRP_MAX+1];

    int chirp_count; /* # of chirps in the current workout */
    int cur_chirp; /* which chirp are we working on? */
    int cur_time; /* current time we are writing */

    char wname[100]; /* workout name from the file */
    int len;
    char dbuf[100]; /* one chirp line from the file */

    /* for reading one chirp */
    int sec;
    int seqno;
    float speed, incline;
    int sec_length; /* length of workout in seconds */

    printf("initializaing\n");
    /* build our 1 second of silence */
    memset( Silence, 0, SAMP_RATE );

    printf("opening input file %s\n", argv[1] );

    /* open the description file */
    fopen_s( &f, argv[1], "r" );

    if ( f == NULL )
    {
    printf("Unable to open file %s\n", argv[1] );
    return 1;
    }

    /* read one workout from the file */
    while( 1==1 )
    {
    printf("reading one line from the workout\n");
    /* at end of file? */
    if ( feof(f) )
    {
    return 0;
    }

    /* get the header line */
    fgets( wname, 90, f );

    /* did we now detect end of file? */
    if ( feof(f) )
    {
    return 0;
    }

    /* read the workout stages */
    chirp_count = 0;
    sec_length = 45; /* account for lead and trail time */
    while( 1==1) {
    fgets( dbuf, 90, f );
    printf("read line %s", dbuf );

    /* did we now detect end of file? - Shouldn't happen, but check */
    if ( feof(f) || strlen(dbuf)<3 )
    {
    break;
    }

    if ( ! isdigit( dbuf[0] ) )
    {
    /* should have only numbers here */
    return 3;
    }

    /* extract the information */
    sscanf_s( dbuf, "%d %f %f %d", &seqno, &speed, &incline, &sec );
    printf("speed=%3.1f, incline=%3.1f, time=%d\n", speed, incline, sec );

    /* save it for later */
    chirp_list[chirp_count].second_count = sec;
    sec_length += sec;
    chirp_list[chirp_count].speed = speed;
    chirp_list[chirp_count].incline = incline;

    /* move to next chirp */
    chirp_count++;
    }

    /* replace ".txt" with ".wav" for the output filename */
    if ( strlen( argv[1] ) > 90 )
    {
    printf("Error: path/filename too long\n");
    exit(1);
    }
    strcpy( wname, argv[1] );
    strcpy( wname+strlen(wname)-3, "wav" );

    /* start creating our WAV file */
    printf("Creating output file %s\n", wname );
    fopen_s( &audio, wname, "wb" );

    printf("Overall length: %d seconds\n", sec_length );

    /* create header */
    FileHeader.ID = ID_RIFF;
    FileHeader.DataType = ID_WAVE;

    /* create our format header */
    FormatHeader.ID = ID_FMT;
    FormatHeader.Len = 16; /* chunk length */
    FormatHeader.FormatTag = 1; /* format (1 if uncompressed) */
    FormatHeader.Channels = 1; /* # of channels */
    FormatHeader.SampPerSec = SAMP_RATE; /* # of samples per second */
    FormatHeader.AvgBytesPerSec = SAMP_RATE*2; /* # of bytes played per second */
    FormatHeader.BlockAlign = 1; /* Size of a 'frame' in bytes */
    FormatHeader.BitsPerSamp = 16; /* bits per sample */

    /* create our data header */
    DataHeader.ID = ID_DATA;
    DataHeader.Len = (sec_length+LEAD_SILENCE) * SAMP_RATE;

    /* update overall length, account for various headers except main RIFF part */
    /* -- include 'WAVE' part of main header */
    FileHeader.Len = DataHeader.Len + 4 +
    + sizeof(FormatHeader) + sizeof( DataHeader );

    /* write it to the file */
    fwrite( &FileHeader, sizeof(FileHeader), 1, audio );

    /* write it to the file */
    fwrite( &FormatHeader, sizeof(FormatHeader), 1, audio );

    /* write it to the file */
    fwrite( &DataHeader, sizeof(DataHeader), 1, audio );

    /* start with silence */
    printf("Writing lead-in\n" );
    for( cur_time = 0; cur_time < LEAD_SILENCE; cur_time++ )
    {
    fwrite( &Silence, 1, SAMP_RATE, audio );
    }

    /* now do the chirps */
    for( cur_chirp=0; cur_chirp < chirp_count; cur_chirp++ )
    {
    printf("Chirp #%d, time=%d, speed=%4.1f, incline=%4.1f\n",
    cur_chirp+1, chirp_list[cur_chirp].second_count,
    chirp_list[cur_chirp].speed, chirp_list[cur_chirp].incline );

    /* add the chirp */
    insert_chirp( audio, chirp_list[cur_chirp].speed,
    chirp_list[cur_chirp].incline );

    /* add enough silence between this chirp and the next */
    for( cur_time = 1;
    cur_time < chirp_list[cur_chirp].second_count; cur_time++ )
    {
    /* add another second of silence */
    fwrite( &Silence, 1, SAMP_RATE, audio );
    }
    }

    /* add the stop chirp */
    printf("Stop chirp\n");
    insert_chirp( audio, 25.2, 25.2 );

    /* end with 30 seconds of silence */
    printf("Writing 30 seconds lead-out\n" );
    for( cur_time = 1; cur_time < 30; cur_time++ )
    {
    fwrite( &Silence, 1, SAMP_RATE, audio );
    }

    /* done with this workout */
    fclose( audio );
    } /* while reading workouts */
    }

    关于android - 如何从 Android 中的多个声音 block 创建单个声音文件,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/31920890/

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