サウンドストリーミング

local function play_sound(self, hash)
    go.set(self.component, "sound", hash) -- override the resource data on the component
    sound.play(self.component)            -- start playing the sound
end

local function parse_content_range(value)
    if not value then
        return nil
    end
    local rstart, rend, filesize = value:match("^bytes%s+(%d+)%-(%d+)/(%d+)$")
    return tonumber(rstart), tonumber(rend), tonumber(filesize)
end

-- Callback for the http response.
local function http_result(self, _id, response)
    if response.status ~= 200 and response.status ~= 206 then
        return
    end

    local options = {
        data = response.response,
    }

    if response.status == 206 then
        local rstart, _, filesize = parse_content_range(response.headers["content-range"])
        if rstart ~= 0 or not filesize then
            print("Invalid Content-Range response")
            return
        end

        -- A partial resource enables streaming. filesize is the size of the
        -- complete file, not only the returned range.
        if #response.response < filesize then
            options.filesize = filesize
            options.partial = true
        end
    end

    local relative_path = self.filename
    print("Creating resource", relative_path)
    local resource_hash = resource.create_sound_data(relative_path, options)
    play_sound(self, resource_hash)
end

local function load_web_sound(base_url, relative_path)
    local url = base_url .. "/" .. relative_path
    local headers = {}
    headers['Range'] = string.format("bytes=%d-%d", 0, 16384-1)

    http.request(url, "GET", http_result, headers, nil, { ignore_cache = true })
end

-- See http_result() from above example

local function load_web_sound(base_url, relative_path)
    local url = base_url .. "/" .. relative_path
    local headers = {}
    -- Request the initial part of the file
    headers['Range'] = string.format("bytes=%d-%d", 0, 16384-1)

    http.request(url, "GET", http_result, headers, nil, { ignore_cache = true })
end

function init(self)
    self.base_url = "http://my.server.com"
    self.filename = "/path/to/sound.ogg"

    liveupdate.add_mount("webmount", self.base_url, 100, function (_self, _name, _uri, _result)
                    -- once the mount is ready, we can start our request for downloading the first chunk
                    load_web_sound(self.base_url, self.filename)
                end)
end

function final(self)
    liveupdate.remove_mount("webmount")
end