/// <summary>
/// Initializes the output context and writes the file header.
/// </summary>
/// <param name="inputContext">The input context</param>
private void Initialize(AVFormatContext *inputContext)
{
var result = 0;
try
{
var outputFilePath = GuessOutputFilePath(inputContext);
AVFormatContext *outputContext;
result = ffmpeg.avformat_alloc_output_context2(&outputContext, null, null, outputFilePath);
if (result < 0)
{
throw new InvalidOperationException("Unable to allocate output context");
}
OutputContext = outputContext;
StreamMappings.Clear();
foreach (var streamIndex in Media.MediaInfo.Streams.Keys)
{
var codecParams = inputContext->streams[streamIndex]->codecpar;
var stream = ffmpeg.avformat_new_stream(OutputContext, null);
if (stream == null)
{
result = -ffmpeg.ENOMEM;
throw new InvalidOperationException($"Unable to create output stream for stream index {streamIndex}");
}
result = ffmpeg.avcodec_parameters_copy(stream->codecpar, codecParams);
if (result < 0)
{
throw new InvalidOperationException($"Unable to copy codec parameters to stream index {streamIndex}");
}
stream->codecpar->codec_tag = 0;
StreamMappings[streamIndex] = stream->index;
}
result = ffmpeg.avio_open(&outputContext->pb, outputFilePath, ffmpeg.AVIO_FLAG_WRITE);
if (result < 0)
{
throw new InvalidOperationException($"Could not open output file '{outputFilePath}'");
}
result = ffmpeg.avformat_write_header(OutputContext, null);
if (result < 0)
{
throw new InvalidOperationException($"Could not write header to '{outputFilePath}'");
}
HasInitialized = true;
}
catch (Exception ex)
{
Media.LogError(nameof(TransportStreamRecorder), $"Error Code {result}: {ex.Message}");
Release();
}
}
