private void SeekInner(int frame)
{
int frame_block_number = GetBlockNumber(frame);
int current_block_number = GetBlockNumber(current_frame_);
if (frame_block_number == current_block_number && current_frame_ <= frame) // シークする必要なし
{
return;
}
if (frame_block_number > 0)
{
long dts = key_dts_list_[frame_block_number - 1];
AVCodecAPI.av_seek_frame(p_avformat_context, video_stream_index, dts + 1, 0);
current_frame_ = DtsToVideoFrame(key_dts_list_[frame_block_number]);
}
else
{
AVCodecAPI.av_seek_frame(p_avformat_context, video_stream_index, 0, 0);
current_frame_ = 0;
}
av_packet_queue_.Clear(); // パケットをフラッシュする
audio_priority_times_ = 10; // シークした直後は音声優先
}
private void DecodeVideo(AVPacket packet)
{
int frame_finished;
AVCodecAPI.avcodec_decode_video(video_stream.codec, p_frame, out frame_finished, packet.data, packet.size);
if (frame_finished > 0)
{
BufferContainer buffer = video_buffer_manager_.GetEmptyBufferContainer(current_frame_);
double dummy_val = 0;
AVCodecAPI.avpicture_fill(p_frame_rgb, buffer.Buffer, (int)AVCodecAPI.AVPixelFormat.PIX_FMT_BGR24,
Width, Height);
IntPtr sws_context = AVCodecAPI.sws_getContext(video_codec_context.width, video_codec_context.height,
video_codec_context.pix_fmt, Width, Height,
(int)AVCodecAPI.AVPixelFormat.PIX_FMT_BGR24, 4, IntPtr.Zero, IntPtr.Zero, ref dummy_val);
try
{
AVCodecAPI.sws_scale(sws_context, p_frame, new IntPtr(p_frame.ToInt32() + 16), 0,
video_codec_context.height, p_frame_rgb, new IntPtr(p_frame_rgb.ToInt32() + 16));
}
finally
{
AVCodecAPI.sws_freeContext(sws_context);
}
buffer.Time = (int)packet.dts;
current_frame_ = DtsToVideoFrame((int)packet.dts);
buffer.Frame = current_frame_;
video_buffer_manager_.SetBufferContainer(buffer);
}
}
// H.264 動画で TimeScale が4倍精度になってるか調べる
public bool IsTimeScaleFour()
{
int c;
int count = 0;
long[] dts = new long[4];
if (video_codec_context.codec_id != 28) // H.264 でないので関係ない
{
return(false);
}
while ((c = AVCodecAPI.av_read_frame(p_avformat_context, p_packet)) >= 0)
{
PacketContainer container = new PacketContainer(p_packet);
if (container.packet.stream_index == video_stream_index)
{
dts[count] = container.packet.dts;
++count;
}
container.Destruct();
if (count >= dts.Length)
{
break;
}
}
AVCodecAPI.av_seek_frame(p_avformat_context, video_stream_index, 0, 0);
return(dts[1] - dts[0] == 1001 && dts[2] - dts[1] == 1001 && dts[3] - dts[2] == 2002);
}
/// <summary>
/// ファイルを閉じる
/// </summary>
public void Close()
{
if (IsOpen)
{
lock (command_queue_)
{
command_queue_.Add(new Command(Command.Kind.EndThread));
}
thread_end_event_.WaitOne();
if (video_stream_index >= 0)
{
AVCodecAPI.avcodec_close(video_stream.codec);
}
if (audio_stream_index >= 0)
{
AVCodecAPI.avcodec_close(audio_stream.codec);
}
AVCodecAPI.av_close_input_file(p_avformat_context);
if (HasVideo)
{
video_buffer_manager_.Close();
}
if (HasAudio)
{
audio_buffer_manager_.Close();
}
Clear();
}
}
public void Destruct()
{
if (ptr != IntPtr.Zero && packet.destruct != IntPtr.Zero)
{
AVCodecAPI.av_destruct_packet(ptr);
packet = null;
ptr = IntPtr.Zero;
}
}
private PacketContainer ReadPacket()
{
if (audio_priority_times_ > 0)
{
--audio_priority_times_;
int c;
while ((c = AVCodecAPI.av_read_frame(p_avformat_context, p_packet)) >= 0)
{
PacketContainer packet = new PacketContainer(p_packet);
if (packet.packet.stream_index == audio_stream_index)
{
return(packet);
}
else
{
av_packet_queue_.Enqueue(packet);
}
}
if (av_packet_queue_.Count > 0)
{
return(av_packet_queue_.Dequeue());
}
else
{
return(null);
}
}
else
{
if (av_packet_queue_.Count > 0)
{
return(av_packet_queue_.Dequeue());
}
else
{
int c = AVCodecAPI.av_read_frame(p_avformat_context, p_packet);
if (c >= 0)
{
PacketContainer packet = new PacketContainer(p_packet);
return(packet);
}
else
{
return(null);
}
}
}
}
public void FixIllegalFrameRate()
{
int c;
int count = 0;
long[] dts = new long[50];
while ((c = AVCodecAPI.av_read_frame(p_avformat_context, p_packet)) >= 0)
{
PacketContainer container = new PacketContainer(p_packet);
if (container.packet.stream_index == video_stream_index)
{
dts[count] = container.packet.dts;
++count;
}
container.Destruct();
if (count >= dts.Length)
{
break;
}
}
double average_dts = 0.0;
for (int i = 5; i < count - 1; ++i) // 最初の5フレームは捨てる
{
average_dts += dts[i + 1] - dts[i];
}
average_dts /= (double)(count - 1 - 5);
if (average_dts > 0)
{
double new_frame_rate_d = (double)video_stream.time_base.den / video_stream.time_base.num / average_dts;
int new_frame_rate = (int)(new_frame_rate_d * 1000);
int new_frame_scale = 1000;
new_frame_rate = 30;
new_frame_scale = 1;
for (int i = 0; i < key_frame_list_.Count; ++i)
{
key_frame_list_[i] = (int)((double)key_frame_list_[i] * new_frame_rate * video_scale_
/ ((double)new_frame_scale * video_rate_));
}
video_rate_ = new_frame_rate;
video_scale_ = new_frame_scale;
}
AVCodecAPI.av_seek_frame(p_avformat_context, video_stream_index, 0, 0);
}
private void DecodeAudio(AVPacket packet)
{
int output_size = audio_temp_buffer_size_;
int c = AVCodecAPI.avcodec_decode_audio2(audio_stream.codec, p_audio_buffer,
ref output_size, packet.data, packet.size);
if (c < 0 || c != packet.size)
{
throw new AVCodecException();
}
if (output_size > 0)
{
int audio_byte = DtsToAudioByte((int)packet.dts);
// output_size 単位にまるめる
audio_byte = ((audio_byte + output_size / 2) / output_size) * output_size;
audio_buffer_manager_.SetAudioData(p_audio_buffer, output_size, audio_byte);
}
}
private void OpenCodec(string filename)
{
AVCodecAPI.av_register_all();
int error_code = AVCodecAPI.av_open_input_file(out p_avformat_context, filename, IntPtr.Zero, 0, IntPtr.Zero);
if (error_code != 0)
{
throw new AVCodecCannotOpenFileException();
}
error_code = AVCodecAPI.av_find_stream_info(p_avformat_context);
if (error_code < 0)
{
throw new AVCodecException();
}
format_context = (AVFormatContext)Marshal.PtrToStructure(p_avformat_context, typeof(AVFormatContext));
for (int i = 0; i < format_context.nb_streams; ++i)
{
AVStream stream = (AVStream)Marshal.PtrToStructure(format_context.streams[i], typeof(AVStream));
AVCodecContext temp_codec_context = (AVCodecContext)Marshal.PtrToStructure(stream.codec,
typeof(AVCodecContext));
if (temp_codec_context.codec_type == 0)
{
if (video_stream_index < 0)
{
video_stream_index = i;
video_stream = stream;
video_codec_context = temp_codec_context;
}
}
else if (temp_codec_context.codec_type == 1)
{
if (audio_stream_index < 0)
{
audio_stream_index = i;
audio_stream = stream;
audio_codec_context = temp_codec_context;
}
}
}
if (video_stream_index >= 0)
{
p_video_codec = AVCodecAPI.avcodec_find_decoder(video_codec_context.codec_id);
error_code = AVCodecAPI.avcodec_open(video_stream.codec, p_video_codec);
if (error_code < 0)
{
throw new AVCodecException();
}
}
if (audio_stream_index >= 0)
{
p_audio_codec = AVCodecAPI.avcodec_find_decoder(audio_codec_context.codec_id);
error_code = AVCodecAPI.avcodec_open(audio_stream.codec, p_audio_codec);
if (error_code < 0)
{
throw new AVCodecException();
}
}
}
/// <summary>
/// 動画ファイルを開く
/// </summary>
/// <param name="filename">ファイルパス</param>
/// <param name="width">動画サイズを固定する場合の幅（負の値を指定した場合は元の動画サイズになる）</param>
/// <param name="height">動画サイズを固定する場合の高さ（負の値を指定した場合は元の動画サイズになる）</param>
/// <param name="memory_size">使用するメモリサイズ（MB）（負の値を指定した場合は自動設定）</param>
public void Open(string filename, int video_width, int video_height, int memory_size)
{
OpenCodec(filename);
fixed_video_width_ = video_width;
fixed_video_height_ = video_height;
video_rate_ = video_stream.r_frame_rate.num;
video_scale_ = video_stream.r_frame_rate.den;
p_frame = AVCodecAPI.avcodec_alloc_frame();
p_frame_rgb = AVCodecAPI.avcodec_alloc_frame();
p_packet = AVCodecAPI.av_malloc(Marshal.SizeOf(new AVPacket()));
long last_dts = 0;
int c = 0;
bool is_first = true;
int start_frame = 0;
while (c >= 0)
{
if (!is_first)
{
AVCodecAPI.av_seek_frame(p_avformat_context, video_stream_index, last_dts + 1, 0);
}
while ((c = AVCodecAPI.av_read_frame(p_avformat_context, p_packet)) >= 0)
{
PacketContainer container = new PacketContainer(p_packet);
if (container.packet.stream_index == video_stream_index)
{
last_dts = container.packet.dts;
key_dts_list_.Add(last_dts);
key_frame_list_.Add(DtsToVideoFrame(last_dts));
if (is_first)
{
is_first = false;
start_frame = key_frame_list_[key_frame_list_.Count - 1];
}
break;
}
container.Destruct();
}
}
AVCodecAPI.av_seek_frame(p_avformat_context, video_stream_index, 0, 0);
if (IsTimeScaleFour())
{
video_scale_ *= 4;
for (int i = 0; i < key_frame_list_.Count; ++i)
{
key_frame_list_[i] /= 4;
}
}
if (video_rate_ / video_scale_ > 60)
{
FixIllegalFrameRate();
}
if (HasVideo)
{
if (memory_size <= 0)
{
memory_size = Math.Min(Math.Max(BufferContainer.GetMemorySize() / (1024 * 1024) - 500, 100), 500); // 最小100MB、最大500MB
}
video_buffer_manager_ = new VideoBufferManager(this, FrameLength, memory_size * 1024 * 1024 / VideoPictureBufferSize, start_frame);
}
if (HasAudio)
{
audio_buffer_manager_ = new AudioBufferManager();
audio_buffer_manager_.SetDataLength(AudioSampleRate * AudioChannel
* AudioBytesPerSample * format_context.duration / 1000000);
p_audio_buffer = Marshal.AllocHGlobal(audio_temp_buffer_size_);
audio_priority_times_ = 10;
}
StartDecoding();
}
