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/*
* Copyright 2003-2021 The Music Player Daemon Project
* http://www.musicpd.org
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifndef MPD_FFMPEG_IO_CONTEXT_HXX
#define MPD_FFMPEG_IO_CONTEXT_HXX
#include "Error.hxx"
extern "C" {
#include <libavformat/avio.h>
}
#include <utility>
namespace Ffmpeg {
class IOContext {
AVIOContext *io_context = nullptr;
public:
IOContext() = default;
IOContext(const char *url, int flags) {
int err = avio_open(&io_context, url, flags);
if (err < 0)
throw MakeFfmpegError(err);
}
~IOContext() noexcept {
if (io_context != nullptr)
avio_close(io_context);
}
IOContext(IOContext &&src) noexcept
:io_context(std::exchange(src.io_context, nullptr)) {}
IOContext &operator=(IOContext &&src) noexcept {
using std::swap;
swap(io_context, src.io_context);
return *this;
}
AVIOContext &operator*() noexcept {
return *io_context;
}
AVIOContext *operator->() noexcept {
return io_context;
}
[[gnu::pure]]
auto GetSize() const noexcept {
return avio_size(io_context);
}
[[gnu::pure]]
bool IsEOF() const noexcept {
return avio_feof(io_context) != 0;
}
size_t Read(void *buffer, size_t size) {
#if LIBAVFORMAT_VERSION_INT >= AV_VERSION_INT(57, 81, 100)
int result = avio_read_partial(io_context,
(unsigned char *)buffer, size);
#else
int result = avio_read(io_context,
(unsigned char *)buffer, size);
#endif
if (result < 0)
throw MakeFfmpegError(result, "avio_read() failed");
return result;
}
uint64_t Seek(uint64_t offset) {
int64_t result = avio_seek(io_context, offset, SEEK_SET);
if (result < 0)
throw MakeFfmpegError(result, "avio_seek() failed");
return result;
}
};
} // namespace Ffmpeg
#endif