/// <summary>
/// Writes the specified audio data to the stream as the next frame.
/// </summary>
/// <param name="data">The audio data to write.</param>
/// <param name="customPtsValue">(optional) custom PTS value for the frame.</param>
public void AddFrame(AudioData data, long customPtsValue)
{
if (customPtsValue <= lastFramePts)
{
throw new Exception("Cannot add a frame that occurs chronologically before the most recently written frame!");
}
frame.UpdateFromAudioData(data);
var converted = AudioFrame.Create(
frame.SampleRate,
frame.NumChannels,
frame.NumSamples,
frame.ChannelLayout,
Configuration.SampleFormat);
converted.PresentationTimestamp = customPtsValue;
ffmpeg.swr_convert_frame(swrContext, converted.Pointer, frame.Pointer);
stream.Push(converted);
converted.Dispose();
lastFramePts = customPtsValue;
}
/// <summary>
/// Reads the next frame from the audio stream.
/// </summary>
/// <returns>The decoded audio data.</returns>
public new AudioData GetNextFrame()
{
var frame = base.GetNextFrame() as AudioFrame;
var converted = AudioFrame.Create(
frame.SampleRate,
frame.NumChannels,
frame.NumSamples,
frame.ChannelLayout,
SampleFormat.SingleP);
ffmpeg.swr_convert_frame(swrContext, converted.Pointer, frame.Pointer);
return(new AudioData(converted));
}
/// <summary>
/// Reads the video frame found at the specified timestamp.
/// </summary>
/// <param name="time">The frame timestamp.</param>
/// <returns>The decoded video frame.</returns>
public new AudioData GetFrame(TimeSpan time)
{
var frame = base.GetFrame(time) as AudioFrame;
var converted = AudioFrame.Create(
frame.SampleRate,
frame.NumChannels,
frame.NumSamples,
frame.ChannelLayout,
SampleFormat.SingleP,
frame.DecodingTimestamp,
frame.PresentationTimestamp);
ffmpeg.swr_convert_frame(swrContext, converted.Pointer, frame.Pointer);
return(new AudioData(converted));
}
/// <summary>
/// Initializes a new instance of the <see cref="AudioOutputStream"/> class.
/// </summary>
/// <param name="stream">The audio stream.</param>
/// <param name="config">The stream setting.</param>
internal AudioOutputStream(OutputStream <AudioFrame> stream, AudioEncoderSettings config)
{
this.stream = stream;
long channelLayout = ffmpeg.av_get_default_channel_layout(config.Channels);
swrContext = ffmpeg.swr_alloc_set_opts(
null,
channelLayout,
(AVSampleFormat)config.SampleFormat,
config.SampleRate,
channelLayout,
(AVSampleFormat)SampleFormat.SingleP,
config.SampleRate,
0,
null);
ffmpeg.swr_init(swrContext);
Configuration = config;
frame = AudioFrame.Create(config.SampleRate, config.Channels, config.SamplesPerFrame, channelLayout, SampleFormat.SingleP);
}
