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membrane_hls_plugin
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Adaptive live streaming (HLS) plugin for the Membrane Framework.
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lib/membrane/hls/packed_aac_sink.ex
defmodule Membrane.HLS.PackedAACSink do
use Membrane.Sink
alias HLS.Packager
require Membrane.Logger
def_input_pad(:input,
accepted_format: Membrane.AAC
)
def_options(
packager: [
spec: pid(),
description: "PID of the packager."
],
track_id: [
spec: String.t(),
description: "ID of the track."
],
build_stream: [
spec: (Membrane.AAC.t() -> HLS.VariantStream.t() | HLS.AlternativeRendition.t()),
description: "Build the stream with the given stream format"
],
target_segment_duration: [
spec: Membrane.Time.t()
]
)
@impl true
def handle_init(_context, opts) do
{[], %{opts: opts}}
end
@impl true
def handle_stream_format(:input, format, _ctx, state) do
track_id = state.opts.track_id
target_segment_duration =
Membrane.Time.as_seconds(state.opts.target_segment_duration, :exact)
|> Ratio.ceil()
stream = state.opts.build_stream.(format)
info = %{
mp4a: %{
aot_id: Membrane.AAC.profile_to_aot_id(format.profile),
channels: Membrane.AAC.channels_to_channel_config_id(format.channels),
frequency: format.sample_rate
}
}
codecs = Membrane.HLS.serialize_codecs(info)
Packager.add_track(
state.opts.packager,
track_id,
codecs: codecs,
stream: stream,
segment_extension: ".aac",
target_segment_duration: target_segment_duration
)
{[], state}
end
@impl true
def handle_buffer(:input, buffer, _ctx, state) do
Packager.put_segment(
state.opts.packager,
state.opts.track_id,
buffer.payload,
Membrane.Time.as_seconds(buffer.metadata.duration) |> Ratio.to_float()
)
{[], state}
end
end