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const std = @import("std");
const c = @cImport({
@cInclude("mpg123.h");
@cInclude("alsa/asoundlib.h");
});
pub const snd_pcm_info_t = extern struct {};
pub extern fn snd_pcm_info_malloc(pcm_info: *snd_pcm_info_t) void;
pub extern fn snd_pcm_info(pcm: *c.snd_pcm_t, pcm_info: *snd_pcm_info_t) c_int;
pub extern fn snd_pcm_info_free(pcm_info: *snd_pcm_info_t) void;
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;
_ = c.snd_pcm_hw_params_malloc(¶ms);
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", .{});
// TODO: figure out how to deal with opaque status
var pcm_info: snd_pcm_info_t = snd_pcm_info_t{};
snd_pcm_info_malloc(&pcm_info);
_ = snd_pcm_info(pcm, &pcm_info);
defer snd_pcm_info_free(&pcm_info);
std.log.debug("pcm status is {any}", .{pcm_info});
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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