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const std = @import("std");
const c = @cImport({
@cInclude("mpg123.h");
@cInclude("alsa/asoundlib.h");
});
pub fn brr(file: []const u8) !void {
_ = c.mpg123_init();
const handle = c.mpg123_new(null, null) orelse {
std.log.warn("Failed to create mpg123 handle\n", .{});
return;
};
const file_path: [*c]const u8 = @ptrCast(file);
if (c.mpg123_open(handle, file_path) != c.MPG123_OK) {
std.log.warn("Failed to open the file: {s}\n", .{file_path});
return;
}
var pcm: ?*c.snd_pcm_t = undefined;
if (c.snd_pcm_open(&pcm, "default", c.SND_PCM_STREAM_PLAYBACK, 0) < 0) {
std.log.warn("Failed to open ALSA device\n", .{});
return;
}
var params: ?*c.snd_pcm_hw_params_t = null;
if (c.snd_pcm_hw_params_malloc(¶ms) < 0) {
std.log.warn("Failed to allocate ALSA hardware parameters\n", .{});
return;
}
var encoding: c_int = 0;
var channels: c_int = 0;
var rate: c_long = 0;
if (c.mpg123_getformat(handle, &rate, &channels, &encoding) != c.MPG123_OK) {
std.log.warn("Failed to get format\n", .{});
return;
}
_ = c.snd_pcm_hw_params(pcm, params);
_ = c.snd_pcm_hw_params_set_access(pcm, params, c.SND_PCM_ACCESS_RW_INTERLEAVED);
_ = c.snd_pcm_hw_params_set_access(pcm, params, c.SND_PCM_FORMAT_S16_LE);
_ = c.snd_pcm_hw_params_set_channels(pcm, params, @intCast(channels));
_ = c.snd_pcm_hw_params_set_rate(pcm, params, @intCast(rate), 0);
_ = c.snd_pcm_hw_params(pcm, params);
var buffer: [4096]u8 = undefined;
while (true) {
var done: usize = 0;
const result = c.mpg123_read(handle, &buffer[0], buffer.len, &done);
switch (result) {
c.MPG123_OK => {},
c.MPG123_DONE => {
std.log.info("Done reading", .{});
},
else => {
const plain_error = c.mpg123_plain_strerror(result);
std.log.err("Decode error {s}", .{plain_error});
},
}
if (done == 0) {
break;
}
const frames_sent = c.snd_pcm_writei(pcm, &buffer[0], done / 4);
if (frames_sent < 0) {
std.log.err("Failed to write to ALSA device", .{});
var status: ?*c.snd_pcm_status_t = null;
_ = c.snd_pcm_status_malloc(&status);
defer c.snd_pcm_status_free(status);
_ = c.snd_pcm_status(pcm, status);
const state = c.snd_pcm_status_get_state(status);
switch (state) {
c.SND_PCM_STATE_SUSPENDED => {
std.log.warn("ALSA device is suspended", .{});
_ = c.snd_pcm_resume(pcm);
},
c.SND_PCM_STATE_XRUN => {
std.log.warn("ALSA device is in an XRUN state", .{});
_ = c.snd_pcm_prepare(pcm);
},
else => {
std.log.err("ALSA device is in an unknown state", .{});
},
}
return;
} else {
std.log.info("Frames sent: {d}", .{frames_sent});
}
}
_ = c.mpg123_delete(handle);
_ = c.snd_pcm_hw_params_free(params);
_ = c.snd_pcm_close(pcm);
_ = c.mpg123_exit();
}
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