实现方式采用的是先录制, 再转换, 播放也是类似. 感觉这样不是很好, 所以后续如果有精力的话, 会把它进行改造. 采用AudioQueue来实现边解码边播放, 也可以实现边录制边编码.
另外, iOS上的AudioFile和AudioFileStream对AMR还是有完整的支持的,具体可以参考AudioTookbox类库中的实现.
- 录制 Amr 格式的音频:
- (IBAction)startRecord:(id)sender
{
NSString *recordFile = [PATH_OF_DOCUMENT stringByAppendingPathComponent:@"test.amr"];
[recorder setSpeakMode:NO];
[recorder recordWithURL:[NSURL URLWithString:recordFile]];
}
- 录制回调信息:
- (void)recorder:(PRNAmrRecorder *)aRecorder didRecordWithFile:(PRNAmrFileInfo *)fileInfo
{
NSLog(@"==================================================================");
NSLog(@"record with file : %@", fileInfo.fileUrl);
NSLog(@"file size: %llu", fileInfo.fileSize);
NSLog(@"file duration : %f", fileInfo.duration);
NSLog(@"==================================================================");
}
- (void)recorder:(PRNAmrRecorder *)aRecorder didPickSpeakPower:(float)power
{
self.powerLabel.text = [NSString stringWithFormat:@"%f", power];
}- 播放指定 Amr 文件:
- (IBAction)playRecord:(id)sender
{
NSString *recordFile = [PATH_OF_DOCUMENT stringByAppendingPathComponent:@"test.amr"];
[player setSpeakMode:outputMode];
[player playWithURL:[NSURL URLWithString:recordFile]];
}- 更改播放输出 (听筒 | 扬声器)
- (IBAction)changeOuput:(id)sender
{
outputMode = !outputMode;
[player setSpeakMode:outputMode];
}