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const std = @import("std");
const c = @cImport({
@cInclude("mpg123.h");
@cInclude("alsa/asoundlib.h");
});
pub fn brr(allocator: std.mem.Allocator, 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 buffer_size = c.mpg123_outblock(handle);
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 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;
}
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;
}
_ = c.snd_pcm_hw_params_any(pcm, params);
_ = 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_format(pcm, params, c.SND_PCM_FORMAT_S16_LE);
_ = c.snd_pcm_hw_params_set_channels(pcm, params, @as(c_uint, @intCast(channels)));
_ = c.snd_pcm_hw_params_set_rate(pcm, params, @as(c_uint, @intCast(rate)), 0);
_ = c.snd_pcm_hw_params(pcm, params);
var done: usize = 0;
var buffer: []u8 = try allocator.alloc(u8, buffer_size);
defer allocator.free(buffer);
const buffer_ptr = @as([*c]u8, @ptrCast(&buffer[0]));
while (c.mpg123_read(handle, buffer_ptr, buffer_size, &done) == c.MPG123_OK) {
std.log.info("Read {} bytes from MP3 file", .{done});
const frames = done / 4;
std.log.debug("Starting sending", .{});
const write_state = c.snd_pcm_writei(pcm, buffer_ptr, @as(c_ulong, frames));
if (write_state < 0) {
if (write_state == -c.EPIPE) { // Buffer underrun
_ = c.snd_pcm_prepare(pcm);
} else {
break;
}
} else if (write_state != frames) {
std.log.warn("Short write, expected {} frames but wrote {}\n", .{ frames, write_state });
}
std.log.info("Written pcm frames {}", .{write_state});
}
_ = c.mpg123_delete(handle);
_ = c.snd_pcm_hw_params_free(params);
_ = c.snd_pcm_close(pcm);
_ = c.mpg123_exit();
}
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