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tstrimmer.cs
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tstrimmer.cs
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/*****************************************************************************
* Version: 0.1
* License: GNU GPLv2
* Authors: vocho
*****************************************************************************/
using System;
using System.IO;
using System.Collections.Generic;
using System.Text.RegularExpressions;
class tstrimmer
{
public static void Main(string[] args)
{
String input_file = "";
String output_file = "";
String trim_fps = "30000/1001";
String trim_file = "";
String trim_start_margin = "00:00:01.000";
String trim_end_margin = "00:00:00.500";
String seek_start = "";
String seek_duration = "";
int chunk_power = 14; // 10:188*1024, 12:188*4096, 14:188*16384, 16:188*65536
if (args.Length == 0)
{
Console.WriteLine("tstrimmer -i in.ts -o out.ts [-trimfps " + trim_fps + "] [-trimfile in.ts.txt] [-trimsm hh:mm:ss.zzz] [-trimem hh:mm:ss.zzz] [-ss hh:mm:ss.zzz] [-t hh:mm:ss.zzz]");
Console.WriteLine(" -i input file name");
Console.WriteLine(" -o output file name");
Console.WriteLine(" -trimfps trim frame rate (defalut: " + trim_fps + ")");
Console.WriteLine(" -trimfile trim file name");
Console.WriteLine(" -trimsm trim start margin (defalut: " + trim_start_margin + ")");
Console.WriteLine(" -trimem trim end margin (defalut: " + trim_end_margin + ")");
Console.WriteLine(" -ss seek start time");
Console.WriteLine(" -t seek duration");
Environment.Exit(0);
}
FileStream reader = null;
FileStream writer = null;
try
{
for (int i = 0; i + 1 < args.Length; i += 2)
{
switch (args[i])
{
case "-i":
input_file = args[i + 1];
break;
case "-o":
output_file = args[i + 1];
break;
case "-trimfps":
trim_fps = args[i + 1];
break;
case "-trimfile":
trim_file = args[i + 1];
break;
case "-trimsm":
trim_start_margin = args[i + 1];
break;
case "-trimem":
trim_end_margin = args[i + 1];
break;
case "-ss":
seek_start = args[i + 1];
break;
case "-t":
seek_duration = args[i + 1];
break;
}
}
// -i
reader = new FileStream(input_file, FileMode.Open, FileAccess.Read);
// -o
writer = new FileStream(output_file, FileMode.Create, FileAccess.Write);
// -trimfps
uint trim_fps_num = 30000;
uint trim_fps_den = 1001;
if (trim_fps != "")
{
string[] ary = trim_fps.Split(new char[] { '/', ':', ',' });
if (ary.Length == 2)
{
trim_fps_num = uint.Parse(ary[0]);
trim_fps_den = uint.Parse(ary[1]);
}
}
// -trimfile
List<ulong> trim_pts_list = new List<ulong>();
if (trim_file != "")
{
string trim_text = File.ReadAllText(trim_file);
MatchCollection matches = Regex.Matches(trim_text, @"\bTrim\(\s*(?<start>\d+)\s*,\s*(?<end>\d+)\s*\)");
foreach (Match match in matches)
{
trim_pts_list.Add(ulong.Parse(match.Groups["start"].Value) * 90000 * trim_fps_den / trim_fps_num % 0x200000000);
trim_pts_list.Add(ulong.Parse(match.Groups["end" ].Value) * 90000 * trim_fps_den / trim_fps_num % 0x200000000);
}
}
if (trim_pts_list.Count == 0)
{
trim_pts_list.Add(0);
trim_pts_list.Add(0x1FFFFFFFF);
}
// -ss
if (seek_start != "")
{
ulong seek_start_pts = (ulong)(TimeSpan.Parse(seek_start).TotalSeconds * 90000) % 0x200000000;
while ((0 < trim_pts_list.Count) && (0 < seek_start_pts))
{
ulong diff = trim_pts_list[1] - trim_pts_list[0];
if (seek_start_pts <= diff)
{
trim_pts_list[0] += seek_start_pts;
break;
}
else
{
trim_pts_list.RemoveRange(0, 2);
seek_start_pts -= diff;
}
}
}
// -t
if (seek_duration != "")
{
ulong seek_duration_pts = (ulong)(TimeSpan.Parse(seek_duration).TotalSeconds * 90000) % 0x200000000;
for (int i = 0; i < trim_pts_list.Count; i += 2)
{
ulong diff = trim_pts_list[i + 1] - trim_pts_list[i];
if (seek_duration_pts <= diff)
{
trim_pts_list[i + 1] = trim_pts_list[i] + seek_duration_pts;
i += 2;
if (i < trim_pts_list.Count)
{
trim_pts_list.RemoveRange(i, trim_pts_list.Count - i);
}
break;
}
else
{
seek_duration_pts -= diff;
}
}
}
if (trim_pts_list.Count == 0)
{
throw new Exception();
}
// -trimsm
ulong trim_start_margin_pts = 1 * 90000;
if (trim_start_margin != "")
{
trim_start_margin_pts = (ulong)(TimeSpan.Parse(trim_start_margin).TotalSeconds * 90000) % 0x200000000;
}
// -trimem
ulong trim_end_margin_pts = 1 * 90000;
if (trim_end_margin != "")
{
trim_end_margin_pts = (ulong)(TimeSpan.Parse(trim_end_margin).TotalSeconds * 90000) % 0x200000000;
}
// fix trim margin
for (int i = 0; i < trim_pts_list.Count; i += 2)
{
if (trim_start_margin_pts < trim_pts_list[i])
{
trim_pts_list[i] -= trim_start_margin_pts;
}
else
{
trim_pts_list[i] = 0;
}
trim_pts_list[i + 1] += trim_end_margin_pts;
}
ulong[] trim_pts_ary = trim_pts_list.ToArray();
// detect packet size
int packet_size = 188;
{
byte[] buf = new byte[192 * 4];
reader.Seek(0, SeekOrigin.Begin);
if (reader.Read(buf, 0, 192 * 4) != (192 * 4))
{
throw new Exception();
}
if ((buf[188 * 0] == 0x47) && (buf[188 * 1] == 0x47) && (buf[188 * 2] == 0x47) && (buf[188 * 3] == 0x47))
{
packet_size = 188;
}
else if ((buf[192 * 0 + 4] == 0x47) && (buf[192 * 1 + 4] == 0x47) && (buf[192 * 2 + 4] == 0x47) && (buf[192 * 3 + 4] == 0x47))
{
packet_size = 192;
}
else
{
throw new Exception();
}
}
// find first keyframe
ulong first_keyframe_pts = ulong.MaxValue;
long first_keyframe_idx = 0;
reader.Seek(0, SeekOrigin.Begin);
while (true) {
byte[] buf = new byte[packet_size];
if (reader.Read(buf, 0, packet_size) != packet_size)
{
break;
}
ulong pts = get_keyframe_pts(buf, packet_size);
if (pts != ulong.MaxValue)
{
first_keyframe_pts = pts;
break;
}
first_keyframe_idx++;
}
if (first_keyframe_pts == ulong.MaxValue) {
throw new Exception();
}
// find final keyframe
ulong final_keyframe_pts = ulong.MaxValue;
long final_keyframe_idx = (reader.Length / packet_size) - 1;
reader.Seek(packet_size * final_keyframe_idx, SeekOrigin.Begin);
while (true) {
byte[] buf = new byte[packet_size];
if (reader.Read(buf, 0, packet_size) != packet_size)
{
break;
}
ulong pts = get_keyframe_pts(buf, packet_size);
if (pts != ulong.MaxValue)
{
final_keyframe_pts = pts;
break;
}
reader.Seek(-packet_size * 2, SeekOrigin.Current);
final_keyframe_idx--;
}
if (final_keyframe_pts == ulong.MaxValue) {
throw new Exception();
}
// detect pts wraparound
bool wraparound_flag = false;
if (final_keyframe_pts < first_keyframe_pts) {
final_keyframe_pts += 0x200000000;
wraparound_flag = true;
Console.WriteLine("detected pts wraparound");
}
// find trim first packet index
long trim_first_idx = -1;
long trim_prev_idx = -1;
{
ulong trim_first_pts = first_keyframe_pts + trim_pts_ary[0];
int chunk_scale = 1 << chunk_power; // 2 ^ 10 = 1024
//int chunk_size = packet_size * chunk_scale; // 188 * 1024, 192 * 1024
long base_chunk_idx = (long)(((ulong)first_keyframe_idx + (ulong)(final_keyframe_idx - first_keyframe_idx) * trim_pts_ary[0] / (final_keyframe_pts - first_keyframe_pts)) >> chunk_power);
long base_packet_idx = (long)(base_chunk_idx << chunk_power);
if (trim_first_pts == first_keyframe_pts)
{
trim_first_idx = first_keyframe_idx;
trim_prev_idx = first_keyframe_idx;
}
else
{
reader.Seek(packet_size * base_packet_idx, SeekOrigin.Begin);
for (long packet_idx = base_packet_idx; packet_idx <= final_keyframe_idx; packet_idx++) {
byte[] buf = new byte[packet_size];
if (reader.Read(buf, 0, packet_size) != packet_size)
{
break;
}
ulong pts = get_keyframe_pts(buf, packet_size);
if (pts != ulong.MaxValue)
{
if (wraparound_flag && (pts < first_keyframe_pts))
{
pts += 0x200000000;
}
if (pts >= trim_first_pts)
{
trim_first_idx = packet_idx;
break;
}
else
{
trim_prev_idx = packet_idx;
}
}
}
}
if (trim_prev_idx < 0)
{
for (long chunk_idx = base_chunk_idx - 1; 0 <= chunk_idx; chunk_idx--) {
long seek_packet_idx = chunk_idx * chunk_scale;
reader.Seek(packet_size * seek_packet_idx, SeekOrigin.Begin);
for (long packet_idx = 0; packet_idx < chunk_scale; packet_idx++) {
byte[] buf = new byte[packet_size];
if (reader.Read(buf, 0, packet_size) != packet_size)
{
break;
}
ulong pts = get_keyframe_pts(buf, packet_size);
if (pts != ulong.MaxValue)
{
if (wraparound_flag && (pts < first_keyframe_pts))
{
pts += 0x200000000;
}
if (pts >= trim_first_pts)
{
trim_first_idx = packet_idx + seek_packet_idx;
if (trim_prev_idx >= 0)
{
chunk_idx = 0;
}
break;
}
else
{
trim_prev_idx = packet_idx + seek_packet_idx;
if (trim_first_idx >= 0)
{
chunk_idx = 0;
break;
}
}
}
}
}
}
if (trim_first_idx < 0) {
throw new Exception();
}
if (trim_prev_idx < 0) {
trim_prev_idx = trim_first_idx;
}
}
bool last_write_status = false;
bool finished_trim = false;
int seek_trim_idx = 0;
List<byte[]> last_gop_packets = new List<byte[]>();
// trim
reader.Seek(packet_size * trim_prev_idx, SeekOrigin.Begin);
while (!finished_trim)
{
byte[] buf = new byte[packet_size];
if (reader.Read(buf, 0, packet_size) != packet_size)
{
break;
}
ulong pts = get_keyframe_pts(buf, packet_size);
bool write_status = false;
if (pts != ulong.MaxValue)
{
if (wraparound_flag && (pts < first_keyframe_pts))
{
pts += 0x200000000;
}
for (int i = seek_trim_idx; i < trim_pts_ary.Length; i += 2)
{
ulong trim_start_pts = first_keyframe_pts + trim_pts_ary[i];
ulong trim_end_pts = first_keyframe_pts + trim_pts_ary[i + 1];
if (trim_start_pts <= pts)
{
if (pts <= trim_end_pts)
{
if (!last_write_status)
{
//ditを挿入したほうが良い？
foreach (byte[] packet in last_gop_packets)
{
writer.Write(packet, 0, packet.Length);
}
}
writer.Write(buf, 0, packet_size);
write_status = true;
seek_trim_idx = i;
break;
}
else if (seek_trim_idx >= (trim_pts_ary.Length - 2))
{
finished_trim = true;
break;
}
}
else
{
break;
}
}
}
else
{
if (last_write_status)
{
writer.Write(buf, 0, packet_size);
write_status = true;
}
}
last_write_status = write_status;
if (pts != ulong.MaxValue)
{
last_gop_packets.Clear();
}
last_gop_packets.Add(buf);
}
}
catch (Exception e)
{
Console.WriteLine(e);
}
finally
{
if (writer != null)
{
writer.Close();
}
if (reader != null)
{
reader.Close();
}
}
}
static ulong get_keyframe_pts(byte[] buf, int packet_size)
{
ulong keyframe_pts = ulong.MaxValue;
int i = 0;
bool pts_flag = false;
ulong pts = ulong.MaxValue;
if (packet_size == 192)
{
i += 4;
}
bool sync_byte = (buf[i + 0] == 0x47);
bool payload_unit_start_indicator = ((buf[i + 1] & 0x40) == 0x40);
ushort pid = (ushort)((((ushort)(buf[i + 1] & 0x1F)) << 8) + buf[i + 2]);
bool adaptation_field_indicator = ((buf[i + 3] & 0x20) == 0x20);
bool payload_indicator = ((buf[i + 3] & 0x10) == 0x10);
i += 4;
if (!sync_byte)
{
return ulong.MaxValue;
}
if (adaptation_field_indicator)
{
int adaptation_field_length = buf[i + 0];
i += 1;
if (adaptation_field_length > 183)
{
return ulong.MaxValue;
}
else if (adaptation_field_length > 0)
{
i += adaptation_field_length;
}
}
if (payload_unit_start_indicator && payload_indicator && (pid != 0x0000) && (pid != 0x1FFF))
{
uint packet_start_code_prefix = (uint)((buf[i + 0] << 8 * 2) + (buf[i + 1] << 8 * 1) + buf[i + 2]);
i += 3;
if (packet_start_code_prefix == 0x000001)
{
byte stream_id = buf[i + 0];
i += 3;
if ((stream_id & 0xF0) == 0xE0) // video
{
i += 1;
pts_flag = ((buf[i + 0] & 0x80) == 0x80);
i += 1;
byte pes_header_data_length = buf[i + 0];
i += 1;
int j = i;
i += pes_header_data_length;
if (pts_flag)
{
pts = (ulong)(((ulong)(buf[j + 0] & 0x0E)) << 8 * 4 - 3) +
(ulong)(((ulong)(buf[j + 1] )) << 8 * 3 - 2) +
(ulong)(((ulong)(buf[j + 2] & 0xFE)) << 8 * 2 - 2) +
(ulong)(((ulong)(buf[j + 3] )) << 8 * 1 - 1) +
(ulong)(((ulong)(buf[j + 4] & 0xFE)) >> 1);
j += 5;
}
uint mpeg_start_code_prefix;
do
{
mpeg_start_code_prefix = (uint)((buf[i + 0]) << 8 * 2) + (uint)((buf[i + 1]) << 8 * 1) + (uint)buf[i + 2];
i += 1;
} while ((mpeg_start_code_prefix != 0x000001) && (buf[i - 1] == 0) && (i < 184));
i += 2;
if (mpeg_start_code_prefix == 0x000001)
{
byte start_code = buf[i + 0];
i += 1;
switch (start_code)
{
case 0x00: // H.262 picture_header
byte picture_coding_type = (byte)((buf[i + 1] & 0x38) >> 3);
i += 3;
switch (picture_coding_type)
{
case 1: // I
break;
case 2: // P
break;
case 3: // B
break;
case 4: // D
break;
}
break;
case 0xB3: // H.262 sequence_header
if (pts_flag)
{
keyframe_pts = pts;
}
break;
case 0xB8: // H.262 group_header
break;
default:
if ((start_code & 0x80) == 0x00)
{
byte nal_unit_type = (byte)(start_code & 0x1F);
switch (nal_unit_type)
{
case 1: // H.264 non-IDR picture
break;
case 2: // H.264 slice data partition A
break;
case 3: // H.264 slice data partition B
break;
case 4: // H.264 slice data partition C
break;
case 5: // H.264 IDR picture
break;
case 6: // H.264 SEI
break;
case 7: // H.264 Sequence parameter set
break;
case 8: // H.264 Picture parameter set
break;
case 9: // H.264 Access unit delimiter
if (pts_flag)
{
keyframe_pts = pts;
}
break;
case 10: // H.264 End of sequence
break;
case 11: // H.264 End of stream
break;
case 12: // H.264 Filler data
break;
}
}
break;
}
}
}
else if ((stream_id & 0xE0) == 0xC0) // audio
{
}
}
}
return keyframe_pts;
}
}