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// libsndfile wrapper
// Copyright (C) 2021-2023 Nguyễn Gia Phong
//
// This file is part of zeal.
//
// Zeal is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published
// by the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Zeal is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with zeal. If not, see <https://www.gnu.org/licenses/>.
const Allocator = std.mem.Allocator;
const assert = std.debug.assert;
const span = std.mem.span;
const std = @import("std");
const c = @import("cimport.zig");
pub const Mode = enum {
read,
write,
read_write,
};
pub const Error = Allocator.Error || error{
UnrecognizedFormat,
SystemError,
MalformedFile,
UnsupportedEncoding,
};
pub const SndFile = struct {
pimpl: *c.SNDFILE,
frames: usize,
sample_rate: c_int,
channels: c_int,
format: c_int,
sections: c_int,
seekable: bool,
/// Open the sound file at the specified path.
pub fn open(path: [:0]const u8, mode: Mode) Error!SndFile {
const c_mode = switch (mode) {
.read => c.SFM_READ,
.write => c.SFM_WRITE,
.read_write => c.SFM_RDWR,
};
var info: c.SF_INFO = undefined;
info.format = 0;
const pimpl = c.sf_open(path.ptr, c_mode, &info);
_ = c.sf_command(pimpl, c.SFC_SET_SCALE_FLOAT_INT_READ,
null, c.SF_TRUE);
return SndFile{
.pimpl = pimpl orelse return switch (c.sf_error(null)) {
c.SF_ERR_UNRECOGNISED_FORMAT => Error.UnrecognizedFormat,
c.SF_ERR_SYSTEM => Error.SystemError,
c.SF_ERR_MALFORMED_FILE => Error.MalformedFile,
c.SF_ERR_UNSUPPORTED_ENCODING => Error.UnsupportedEncoding,
else => unreachable,
},
.frames = @intCast(info.frames),
.sample_rate = info.samplerate,
.channels = info.channels,
.format = info.format,
.sections = info.sections,
.seekable = info.seekable != 0,
};
}
/// Read the requested number of frames.
/// The returned memory is managed by the caller.
pub fn read(self: SndFile, allocator: Allocator,
frames: usize) Error![]const i16 {
const items = frames * @as(usize, @intCast(self.channels));
const memory = try allocator.alloc(i16, items);
errdefer allocator.free(memory);
const n = c.sf_read_short(self.pimpl, memory.ptr, @intCast(items));
return try allocator.realloc(memory, @intCast(n));
}
/// Read the entire file. The returned memory is managed by the caller.
pub fn readAll(self: SndFile, allocator: Allocator) Error![]const i16 {
return self.read(allocator, self.frames);
}
/// Close the file and deallocate its internal buffers.
/// Like std.os.close, this function does not return
/// any indication of failure.
pub fn close(self: SndFile) void {
assert(c.sf_close(self.pimpl) == 0);
}
};
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