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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: [*:0]const u8) !void {
_ = c.mpg123_init();
const handle = c.mpg123_new(null, null) orelse {
std.log.warn("Failed to create mpg123 handle\n", .{});
return;
};
std.log.debug("file {s}", .{file});
if (c.mpg123_open(handle, file) != c.MPG123_OK) {
std.log.warn("Failed to open the file: {s}\n", .{file});
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 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 dir: c_int = 0;
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_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_near(pcm, params, @as(*c_uint, @ptrCast(&rate)), &dir);
if (c.snd_pcm_hw_params(pcm, params) < 0) {
std.log.warn("Failed to set ALSA hardware parameters\n", .{});
return;
}
const buffer_size = c.mpg123_outblock(handle);
var done: usize = 0;
var mpg123_buffer: []u8 = try allocator.alloc(u8, buffer_size);
_ = &mpg123_buffer;
defer allocator.free(mpg123_buffer);
var result: c_int = 0;
while (true) {
result = c.mpg123_read(handle, @as(?*anyopaque, @ptrCast(mpg123_buffer.ptr)), buffer_size, &done);
switch (result) {
c.MPG123_OK => {
_ = c.snd_pcm_writei(pcm, @as(?*anyopaque, @ptrCast(mpg123_buffer.ptr)), done / 4);
},
else => {
const err_str = c.mpg123_strerror(handle);
std.log.warn("Failed to read from file\n {}, {s}", .{ result, err_str });
break;
},
}
}
_ = c.mpg123_delete(handle);
_ = c.snd_pcm_hw_params_free(params);
_ = c.snd_pcm_close(pcm);
_ = c.mpg123_exit();
}
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