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/*
* Copyright 2003-2018 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.
*/
/* necessary because libavutil/common.h uses UINT64_C */
#define __STDC_CONSTANT_MACROS
#include "FfmpegInputPlugin.hxx"
#include "lib/ffmpeg/Init.hxx"
#include "lib/ffmpeg/Domain.hxx"
#include "lib/ffmpeg/Error.hxx"
#include "../InputStream.hxx"
#include "../InputPlugin.hxx"
#include "PluginUnavailable.hxx"
#include "util/ASCII.hxx"
extern "C" {
#include <libavformat/avio.h>
}
struct FfmpegInputStream final : public InputStream {
AVIOContext *h;
bool eof;
FfmpegInputStream(const char *_uri, Mutex &_mutex,
AVIOContext *_h)
:InputStream(_uri, _mutex),
h(_h), eof(false) {
seekable = (h->seekable & AVIO_SEEKABLE_NORMAL) != 0;
size = avio_size(h);
/* hack to make MPD select the "ffmpeg" decoder plugin
- since avio.h doesn't tell us the MIME type of the
resource, we can't select a decoder plugin, but the
"ffmpeg" plugin is quite good at auto-detection */
SetMimeType("audio/x-mpd-ffmpeg");
SetReady();
}
~FfmpegInputStream() {
avio_close(h);
}
/* virtual methods from InputStream */
bool IsEOF() noexcept override;
size_t Read(void *ptr, size_t size) override;
void Seek(offset_type offset) override;
};
static inline bool
input_ffmpeg_supported(void)
{
void *opaque = nullptr;
return avio_enum_protocols(&opaque, 0) != nullptr;
}
static void
input_ffmpeg_init(EventLoop &, const ConfigBlock &)
{
FfmpegInit();
/* disable this plugin if there's no registered protocol */
if (!input_ffmpeg_supported())
throw PluginUnavailable("No protocol");
}
static InputStreamPtr
input_ffmpeg_open(const char *uri,
Mutex &mutex)
{
AVIOContext *h;
auto result = avio_open(&h, uri, AVIO_FLAG_READ);
if (result != 0)
throw MakeFfmpegError(result);
return std::make_unique<FfmpegInputStream>(uri, mutex, h);
}
size_t
FfmpegInputStream::Read(void *ptr, size_t read_size)
{
int result;
{
const ScopeUnlock unlock(mutex);
result = avio_read(h, (unsigned char *)ptr, read_size);
}
if (result <= 0) {
if (result < 0)
throw MakeFfmpegError(result, "avio_read() failed");
eof = true;
return 0;
}
offset += result;
return (size_t)result;
}
bool
FfmpegInputStream::IsEOF() noexcept
{
return eof;
}
void
FfmpegInputStream::Seek(offset_type new_offset)
{
int64_t result;
{
const ScopeUnlock unlock(mutex);
result = avio_seek(h, new_offset, SEEK_SET);
}
if (result < 0)
throw MakeFfmpegError(result, "avio_seek() failed");
offset = result;
eof = false;
}
static constexpr const char *ffmpeg_prefixes[] = {
"gopher://",
"rtp://",
"rtsp://",
"rtmp://",
"rtmpt://",
"rtmps://",
nullptr
};
const InputPlugin input_plugin_ffmpeg = {
"ffmpeg",
ffmpeg_prefixes,
input_ffmpeg_init,
nullptr,
input_ffmpeg_open,
};