internal AudioEncoder(AVStream *stream, AudioFormat inFormat, BitRate bitRate) : base(stream)
{
try {
InFormat = inFormat;
Init(codecContext->CodecId, bitRate);
} catch {
Dispose();
throw;
}
}
public AudioEncoder(AVCodecID codecID, AudioFormat inFormat, BitRate bitRate) : base(codecID)
{
try {
if (codec->Type != AVMediaType.Audio)
{
throw new ArgumentException($"{codecID}不是音频格式", nameof(codecID));
}
codecContext = FF.avcodec_alloc_context3(codec);
if (codecContext == null)
{
throw new Exception("无法分配编码器上下文");
}
InFormat = inFormat;
Init(codecID, bitRate);
} catch {
Dispose();
throw;
}
}
private void Init(AVCodecID codecID, BitRate bitRate)
{
outFormat = MatchSupportedFormat(codecID, InFormat);
if (!InFormat.Equals(OutFormat))
{
resampler = new AudioResampler(InFormat, OutFormat);
tempFrame = new AudioFrame();
}
codecContext->SampleFmt = outFormat.SampleFormat;
codecContext->SampleRate = outFormat.SampleRate;
codecContext->ChannelLayout = outFormat.ChannelLayout;
codecContext->Channels = outFormat.Channels;
codecContext->BitRate = bitRate.Value;
var rates = codecContext->Flags;
int result = FF.avcodec_open2(codecContext, codec, null);
if (result < 0)
{
throw new FFmpegException(result);
}
}
