/// <summary>
/// Create a Consumer.
/// </summary>
/// <param name="consumerOptions"></param>
/// <returns></returns>
public virtual async Task <Consumer> ConsumeAsync(ConsumerOptions consumerOptions)
{
_logger.LogDebug($"ConsumeAsync() | Transport:{TransportId}");
if (consumerOptions.ProducerId.IsNullOrWhiteSpace())
{
throw new ArgumentException("missing producerId");
}
if (consumerOptions.RtpCapabilities == null)
{
throw new ArgumentException(nameof(consumerOptions.RtpCapabilities));
}
if (consumerOptions.Mid != null && consumerOptions.Mid.Length == 0)
{
throw new ArgumentException(nameof(consumerOptions.Mid));
}
if (!consumerOptions.Paused.HasValue)
{
consumerOptions.Paused = false;
}
// This may throw.
ORTC.ValidateRtpCapabilities(consumerOptions.RtpCapabilities);
var producer = GetProducerById(consumerOptions.ProducerId);
if (producer == null)
{
throw new NullReferenceException($"Producer with id {consumerOptions.ProducerId} not found");
}
var pipe = consumerOptions.Pipe.HasValue && consumerOptions.Pipe.Value;
// This may throw.
var rtpParameters = ORTC.GetConsumerRtpParameters(producer.ConsumableRtpParameters, consumerOptions.RtpCapabilities, pipe);
if (!pipe)
{
if (consumerOptions.Mid != null)
{
rtpParameters.Mid = consumerOptions.Mid;
}
else
{
lock (_nextMidForConsumersLock)
{
// Set MID.
rtpParameters.Mid = (_nextMidForConsumers++).ToString();
// We use up to 8 bytes for MID (string).
if (_nextMidForConsumers == 100_000_000)
{
_logger.LogDebug($"ConsumeAsync() | Reaching max MID value {_nextMidForConsumers}");
_nextMidForConsumers = 0;
}
}
}
}
var @internal = new ConsumerInternalData
(
Internal.RouterId,
Internal.TransportId,
consumerOptions.ProducerId,
Guid.NewGuid().ToString()
);
var reqData = new
{
producer.Kind,
RtpParameters = rtpParameters,
Type = pipe ? ProducerType.Pipe : producer.Type,
ConsumableRtpEncodings = producer.ConsumableRtpParameters.Encodings,
consumerOptions.Paused,
consumerOptions.PreferredLayers
};
var resData = await Channel.RequestAsync(MethodId.TRANSPORT_CONSUME, @internal, reqData);
var responseData = JsonSerializer.Deserialize <TransportConsumeResponseData>(resData !, ObjectExtensions.DefaultJsonSerializerOptions) !;
var data = new
{
producer.Kind,
RtpParameters = rtpParameters,
Type = (ConsumerType)(pipe ? ProducerType.Pipe : producer.Type), // 注意：类型转换。ProducerType 的每一种值在 ConsumerType 都有对应且相同的值。
};
var consumer = new Consumer(_loggerFactory,
@internal,
data.Kind,
data.RtpParameters,
data.Type,
Channel,
PayloadChannel,
AppData,
responseData.Paused,
responseData.ProducerPaused,
responseData.Score,
responseData.PreferredLayers);
consumer.On("@close", async(_, _) =>
{
await ConsumersLock.WaitAsync();
try
{
Consumers.Remove(consumer.ConsumerId);
}
catch (Exception ex)
{
_logger.LogError(ex, "@close");
}
finally
{
ConsumersLock.Set();
}
});
consumer.On("@producerclose", async(_, _) =>
{
await ConsumersLock.WaitAsync();
try
{
Consumers.Remove(consumer.ConsumerId);
}
catch (Exception ex)
{
_logger.LogError(ex, "@producerclose");
}
finally
{
ConsumersLock.Set();
}
});
await ConsumersLock.WaitAsync();
try
{
Consumers[consumer.ConsumerId] = consumer;
}
catch (Exception ex)
{
_logger.LogError(ex, "ConsumeAsync()");
}
finally
{
ConsumersLock.Set();
}
// Emit observer event.
Observer.Emit("newconsumer", consumer);
return(consumer);
}
