/// <summary>
/// 截取音频后，对每个小音频获语音转文字，一个音频对应一段文字
/// </summary>
/// <param name="startMilliSecond"></param>
/// <param name="endMilliSecond"></param>
/// <param name="reader"></param>
/// <param name="sound_path"></param>
/// <param name="_name"></param>
/// <param name="language"></param>
/// <param name="splitTime"></param>
private void GetBaiduSpeech(TimeSpan startMilliSecond, TimeSpan endMilliSecond, string sound_path, int i, string language, double splitTime)
{
string newFile = "";
string _newFile = "";
string pcm_newFile = "";
bool need_delete = true;
//将文件保存到新的文件夹（sound_path是原音频路径，newFolder是新的小音频路径，使用完成后将上传到服务器成功的音频删除）
string newFolder = System.AppDomain.CurrentDomain.BaseDirectory + "NewSoundFiles/" + Path.GetFileNameWithoutExtension(sound_path) + "/";
newFolder = newFolder.Replace("/", "\\");
AudioFileReader reader = new AudioFileReader(sound_path);
AudioFileReader _reader = null;//超过60s音频截取小音频
try
{
#region 为截取音频做准备
//开始时间往前取startMilliSecond一半的偏移，结束时间往后取间隔时间的一半的偏移
if (i == 0)
{
startMilliSecond = startMilliSecond - TimeSpan.FromMilliseconds(startMilliSecond.TotalMilliseconds / 2);
}
else
{
startMilliSecond = startMilliSecond - TimeSpan.FromMilliseconds(splitTime / 2);
}
if (endMilliSecond < reader.TotalTime)//最后一次不用取偏移
{
endMilliSecond = endMilliSecond + TimeSpan.FromMilliseconds(splitTime / 2);
}
TimeSpan span = endMilliSecond - startMilliSecond;
if (span.TotalSeconds > 60)//超过60s，只取50秒
{
span = TimeSpan.FromSeconds(50);
}
var trimed = reader.Skip(startMilliSecond).Take(endMilliSecond - startMilliSecond);
#endregion
string fileName = Path.GetFileNameWithoutExtension(sound_path) + "_" + i + Path.GetExtension(sound_path);//重命名文件
//重新存储到一个新的文件目录
if (!System.IO.Directory.Exists(newFolder))
{
System.IO.Directory.CreateDirectory(newFolder);
}
//拼接后的文件路径
newFile = newFolder + fileName;
//截取小音频文件
WaveFileWriter.CreateWaveFile16(newFile, trimed);
//上传到文件服务器
string server_path = UploadFile.PostFile(newFile);
if (Util.isNotNull(server_path))
{
//上传成功
voiceFiles.Add(server_path);
}
else
{
need_delete = false;
//上传失败,在服务器上的路径
voiceFiles.Add(Util.getServerPath() + "/NewSoundFiles/" + Path.GetFileNameWithoutExtension(sound_path) + "/" + fileName);
}
//大于60s的需要再处理
if (span == TimeSpan.FromSeconds(50))//音频大于60s,只截取50s
{
//小音频
_reader = new AudioFileReader(sound_path);
var _trimed = _reader.Skip(startMilliSecond).Take(span);
//保存新的音频文件
string _fileName = "_" + Path.GetFileNameWithoutExtension(sound_path) + "_" + i + ".pcm";//重命名文件
_newFile = newFolder + _fileName;
WaveFileWriter.CreateWaveFile16(_newFile, _trimed);
//将音频转换为文字
//baidu_text.Add(BaiduSpeech.BaiduTranslateToText(_newFile, language, _trimed.WaveFormat.SampleRate.ToString()));
baidu_text.Add(Rays.Utility.BadiAI.BaiduAI.BaiduTranslateToText(_newFile, language, trimed.WaveFormat.SampleRate.ToString()));
}
else
{
//将wav转换成pcm可以提高识别速度
pcm_newFile = NAudioHelper.GetPcmPath(newFile);
//将音频转换为文字
//baidu_text.Add(BaiduSpeech.BaiduTranslateToText(pcm_newFile, language, trimed.WaveFormat.SampleRate.ToString()));
baidu_text.Add(Rays.Utility.BadiAI.BaiduAI.BaiduTranslateToText(pcm_newFile, language, trimed.WaveFormat.SampleRate.ToString()));
}
}
catch (Exception ex)
{
LogHelper.Error("GetBaiduSpeech:" + ex.Message);
}
finally
{
reader.Close();
reader.Dispose();
if (_reader != null)
{
_reader.Close();
_reader.Dispose();
}
//删除文件
//if (File.Exists(_newFile))
//{
// File.Delete(_newFile);
//}
//if (need_delete)
//{
// if (File.Exists(newFile))
// {
// File.Delete(newFile);
// }
//}
////删除目录
//if (Directory.Exists(newFolder) && Directory.GetFiles(newFolder).Length == 0)
//{
// Directory.Delete(newFolder);
//}
//if (File.Exists(pcm_newFile))
//{
// File.Delete(pcm_newFile);
// string pcm_folder = Path.GetDirectoryName(pcm_newFile);
// //删除目录
// if (Directory.Exists(pcm_folder) && Directory.GetFiles(pcm_folder).Length == 0)
// {
// Directory.Delete(pcm_folder);
// }
//}
}
}