How to play back list of files

[pavelmazurov1]

I need to implement simple play back machine with a play list.
The machine must play sound files one by one. Play one file, wait until it ends, then play next if the queue is not empty.
So, i inspected examples, and have two questions.
First, does the device goes to stoped state when file play back ends?
Usecase :

ma_decoder_init_file(file, NULL, &decoder);
ma_device_config_init(ma_device_type_playback);
ma_device_init(NULL, &deviceConfig, &device)
ma_device_start(&device)
while(ma_device_is_started(&device)){ // wait unitl file play back ends }
//go to next file

Second, how and even can i reuse all this decoder, config and device staff to play different files or i need to uninitialize/initialize all them each time i need to play next file?

[mackron]

Devices and decoders are entirely decoupled. While the device is running, the callback will continuously get fired until the device is stopped or uninitialized. From inside the callback you can read from the ma_decoder object and output to the callback's output buffer, exactly like the simple_playback example. You can know if the end of the file has been reached by checking the return value of ma_decoder_read_pcm_frames(). That will return the number of PCM frames actually read. If it's less than what you requested it means you've reached the end and you can change to the next track.

When the track has changed you'll need to do a full reinitialization of a fresh ma_decoder object. Make sure you uninitialize the old decoder with ma_decoder_uninit() first. You don't need to uninitialize and reinitialize the device. If you want to implement some pause functionality you can use ma_device_start() and ma_device_stop().

[pavelmazurov1]

Thank you. I should read documentation more carefull, examples and other questions first. The low level work with sound scared me. I followed your advise and did like you said. Works fine in connection with qt 6 and cpp 17 standart (not sure about that).

It would be wounderfull, if you will show in examples how to implement basic player, with common functionality. Like play/stop/pause, play sounds in queue, play sounds simultaneously, play one shot/repeat and other basic staff. I understand, that this is a high level api, but, you know, that easier to understand and to use )). Anyway, I do not insist on it.

And thanks for quick answer. Great job done with this library!