mirror of
https://github.com/jellyfin/jellyfin.git
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159 lines
5.5 KiB
C#
159 lines
5.5 KiB
C#
//============================================================================
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// BDInfo - Blu-ray Video and Audio Analysis Tool
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// Copyright © 2010 Cinema Squid
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//
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Lesser General Public
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// License as published by the Free Software Foundation; either
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// version 2.1 of the License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this library; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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//=============================================================================
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namespace BDInfo
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{
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public abstract class TSCodecDTS
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{
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private static int[] dca_sample_rates =
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{
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0, 8000, 16000, 32000, 0, 0, 11025, 22050, 44100, 0, 0,
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12000, 24000, 48000, 96000, 192000
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};
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private static int[] dca_bit_rates =
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{
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32000, 56000, 64000, 96000, 112000, 128000,
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192000, 224000, 256000, 320000, 384000,
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448000, 512000, 576000, 640000, 768000,
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896000, 1024000, 1152000, 1280000, 1344000,
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1408000, 1411200, 1472000, 1509000, 1920000,
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2048000, 3072000, 3840000, 1/*open*/, 2/*variable*/, 3/*lossless*/
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};
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private static int[] dca_channels =
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{
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1, 2, 2, 2, 2, 3, 3, 4, 4, 5, 6, 6, 6, 7, 8, 8
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};
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private static int[] dca_bits_per_sample =
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{
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16, 16, 20, 20, 0, 24, 24
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};
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public static void Scan(
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TSAudioStream stream,
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TSStreamBuffer buffer,
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long bitrate,
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ref string tag)
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{
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if (stream.IsInitialized) return;
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bool syncFound = false;
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uint sync = 0;
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for (int i = 0; i < buffer.Length; i++)
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{
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sync = (sync << 8) + buffer.ReadByte();
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if (sync == 0x7FFE8001)
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{
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syncFound = true;
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break;
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}
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}
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if (!syncFound) return;
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int frame_type = buffer.ReadBits(1);
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int samples_deficit = buffer.ReadBits(5);
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int crc_present = buffer.ReadBits(1);
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int sample_blocks = buffer.ReadBits(7);
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int frame_size = buffer.ReadBits(14);
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if (frame_size < 95)
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{
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return;
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}
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int amode = buffer.ReadBits(6);
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int sample_rate = buffer.ReadBits(4);
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if (sample_rate < 0 || sample_rate >= dca_sample_rates.Length)
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{
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return;
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}
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int bit_rate = buffer.ReadBits(5);
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if (bit_rate < 0 || bit_rate >= dca_bit_rates.Length)
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{
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return;
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}
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int downmix = buffer.ReadBits(1);
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int dynrange = buffer.ReadBits(1);
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int timestamp = buffer.ReadBits(1);
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int aux_data = buffer.ReadBits(1);
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int hdcd = buffer.ReadBits(1);
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int ext_descr = buffer.ReadBits(3);
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int ext_coding = buffer.ReadBits(1);
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int aspf = buffer.ReadBits(1);
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int lfe = buffer.ReadBits(2);
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int predictor_history = buffer.ReadBits(1);
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if (crc_present == 1)
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{
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int crc = buffer.ReadBits(16);
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}
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int multirate_inter = buffer.ReadBits(1);
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int version = buffer.ReadBits(4);
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int copy_history = buffer.ReadBits(2);
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int source_pcm_res = buffer.ReadBits(3);
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int front_sum = buffer.ReadBits(1);
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int surround_sum = buffer.ReadBits(1);
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int dialog_norm = buffer.ReadBits(4);
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if (source_pcm_res < 0 || source_pcm_res >= dca_bits_per_sample.Length)
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{
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return;
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}
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int subframes = buffer.ReadBits(4);
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int total_channels = buffer.ReadBits(3) + 1 + ext_coding;
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stream.SampleRate = dca_sample_rates[sample_rate];
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stream.ChannelCount = total_channels;
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stream.LFE = (lfe > 0 ? 1 : 0);
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stream.BitDepth = dca_bits_per_sample[source_pcm_res];
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stream.DialNorm = -dialog_norm;
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if ((source_pcm_res & 0x1) == 0x1)
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{
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stream.AudioMode = TSAudioMode.Extended;
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}
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stream.BitRate = (uint)dca_bit_rates[bit_rate];
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switch (stream.BitRate)
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{
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case 1:
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if (bitrate > 0)
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{
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stream.BitRate = bitrate;
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stream.IsVBR = false;
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stream.IsInitialized = true;
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}
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else
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{
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stream.BitRate = 0;
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}
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break;
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case 2:
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case 3:
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stream.IsVBR = true;
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stream.IsInitialized = true;
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break;
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default:
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stream.IsVBR = false;
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stream.IsInitialized = true;
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break;
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}
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}
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}
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}
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