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using FFmpeg.AutoGen;
using Ryujinx.Common.Logging;
using System;
using System.Diagnostics;
using System.IO;
using System.Runtime.InteropServices;
namespace Ryujinx.Graphics.Nvdec.FFmpeg
{
unsafe class FFmpegContext : IDisposable
{
private readonly AVCodec_decode _decodeFrame;
private static readonly av_log_set_callback_callback _logFunc;
private readonly AVCodec* _codec;
private AVPacket* _packet;
private AVCodecContext* _context;
public FFmpegContext(AVCodecID codecId)
{
_codec = ffmpeg.avcodec_find_decoder(codecId);
if (_codec == null)
{
Logger.Error?.PrintMsg(LogClass.FFmpeg, $"Codec wasn't found. Make sure you have the {codecId} codec present in your FFmpeg installation.");
return;
}
_context = ffmpeg.avcodec_alloc_context3(_codec);
if (_context == null)
{
Logger.Error?.PrintMsg(LogClass.FFmpeg, "Codec context couldn't be allocated.");
return;
}
if (ffmpeg.avcodec_open2(_context, _codec, null) != 0)
{
Logger.Error?.PrintMsg(LogClass.FFmpeg, "Codec couldn't be opened.");
return;
}
_packet = ffmpeg.av_packet_alloc();
if (_packet == null)
{
Logger.Error?.PrintMsg(LogClass.FFmpeg, "Packet couldn't be allocated.");
return;
}
_decodeFrame = Marshal.GetDelegateForFunctionPointer<AVCodec_decode>(_codec->decode.Pointer);
}
static FFmpegContext()
{
SetRootPath();
_logFunc = Log;
// Redirect log output.
ffmpeg.av_log_set_level(ffmpeg.AV_LOG_MAX_OFFSET);
ffmpeg.av_log_set_callback(_logFunc);
}
private static void SetRootPath()
{
if (OperatingSystem.IsLinux())
{
// Configure FFmpeg search path
Process lddProcess = Process.Start(new ProcessStartInfo
{
FileName = "/bin/sh",
Arguments = "-c \"ldd $(which ffmpeg 2>/dev/null) | grep libavfilter\" 2>/dev/null",
UseShellExecute = false,
RedirectStandardOutput = true
});
string lddOutput = lddProcess.StandardOutput.ReadToEnd();
lddProcess.WaitForExit();
lddProcess.Close();
if (lddOutput.Contains(" => "))
{
ffmpeg.RootPath = Path.GetDirectoryName(lddOutput.Split(" => ")[1]);
}
else
{
Logger.Error?.PrintMsg(LogClass.FFmpeg, "FFmpeg wasn't found. Make sure that you have it installed and up to date.");
}
}
}
private static void Log(void* p0, int level, string format, byte* vl)
{
if (level > ffmpeg.av_log_get_level())
{
return;
}
int lineSize = 1024;
byte* lineBuffer = stackalloc byte[lineSize];
int printPrefix = 1;
ffmpeg.av_log_format_line(p0, level, format, vl, lineBuffer, lineSize, &printPrefix);
string line = Marshal.PtrToStringAnsi((IntPtr)lineBuffer).Trim();
switch (level)
{
case ffmpeg.AV_LOG_PANIC:
case ffmpeg.AV_LOG_FATAL:
case ffmpeg.AV_LOG_ERROR:
Logger.Error?.Print(LogClass.FFmpeg, line);
break;
case ffmpeg.AV_LOG_WARNING:
Logger.Warning?.Print(LogClass.FFmpeg, line);
break;
case ffmpeg.AV_LOG_INFO:
Logger.Info?.Print(LogClass.FFmpeg, line);
break;
case ffmpeg.AV_LOG_VERBOSE:
case ffmpeg.AV_LOG_DEBUG:
case ffmpeg.AV_LOG_TRACE:
Logger.Debug?.Print(LogClass.FFmpeg, line);
break;
}
}
public int DecodeFrame(Surface output, ReadOnlySpan<byte> bitstream)
{
ffmpeg.av_frame_unref(output.Frame);
int result;
int gotFrame;
fixed (byte* ptr = bitstream)
{
_packet->data = ptr;
_packet->size = bitstream.Length;
result = _decodeFrame(_context, output.Frame, &gotFrame, _packet);
}
if (gotFrame == 0)
{
ffmpeg.av_frame_unref(output.Frame);
// If the frame was not delivered, it was probably delayed.
// Get the next delayed frame by passing a 0 length packet.
_packet->data = null;
_packet->size = 0;
result = _decodeFrame(_context, output.Frame, &gotFrame, _packet);
// We need to set B frames to 0 as we already consumed all delayed frames.
// This prevents the decoder from trying to return a delayed frame next time.
_context->has_b_frames = 0;
}
ffmpeg.av_packet_unref(_packet);
if (gotFrame == 0)
{
ffmpeg.av_frame_unref(output.Frame);
return -1;
}
return result < 0 ? result : 0;
}
public void Dispose()
{
fixed (AVPacket** ppPacket = &_packet)
{
ffmpeg.av_packet_free(ppPacket);
}
ffmpeg.avcodec_close(_context);
fixed (AVCodecContext** ppContext = &_context)
{
ffmpeg.avcodec_free_context(ppContext);
}
}
}
}
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