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583 lines
17 KiB
583 lines
17 KiB
/* This file is part of the KDE project
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* Copyright (C) 2005 Allan Sandfeld Jensen <kde@carewolf.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License as published by the Free Software Foundation version 2.
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*
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* This program 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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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*
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*/
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// MPEG KFile plugin
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// Based on reading sourcecode of mpeglib, xinelib and libmpeg3
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// and studying MPEG dumps.
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#include <config.h>
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#include "tdefile_mpeg.h"
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#include <kprocess.h>
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#include <tdelocale.h>
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#include <kgenericfactory.h>
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#include <kstringvalidator.h>
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#include <kdebug.h>
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#include <tqdict.h>
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#include <tqvalidator.h>
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#include <tqcstring.h>
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#include <tqfile.h>
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#include <tqdatetime.h>
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// #include <iostream>
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typedef unsigned char uint8_t;
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typedef unsigned short uint16_t;
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typedef unsigned int uint32_t;
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typedef KGenericFactory<KMpegPlugin> MpegFactory;
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K_EXPORT_COMPONENT_FACTORY(tdefile_mpeg, MpegFactory( "tdefile_mpeg" ))
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KMpegPlugin::KMpegPlugin(TQObject *parent, const char *name,
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const TQStringList &args)
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: KFilePlugin(parent, name, args)
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{
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KFileMimeTypeInfo* info = addMimeTypeInfo( "video/mpeg" );
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KFileMimeTypeInfo::GroupInfo* group = 0L;
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group = addGroupInfo(info, "Technical", i18n("Technical Details"));
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KFileMimeTypeInfo::ItemInfo* item;
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item = addItemInfo(group, "Length", i18n("Length"), TQVariant::Int);
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setUnit(item, KFileMimeTypeInfo::Seconds);
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item = addItemInfo(group, "Resolution", i18n("Resolution"), TQVariant::Size);
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item = addItemInfo(group, "Frame rate", i18n("Frame Rate"), TQVariant::Double);
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setSuffix(item, i18n("fps"));
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item = addItemInfo(group, "Video codec", i18n("Video Codec"), TQVariant::String);
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item = addItemInfo(group, "Audio codec", i18n("Audio Codec"), TQVariant::String);
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item = addItemInfo(group, "Aspect ratio", i18n("Aspect ratio"), TQVariant::String);
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}
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// Frame-rate table from libmpeg3
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float frame_rate_table[16] =
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{
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0.0, /* Pad */
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(float)24000.0/1001.0, /* Official frame rates */
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(float)24.0,
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(float)25.0,
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(float)30000.0/1001.0,
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(float)30.0,
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(float)50.0,
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(float)60000.0/1001.0,
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(float)60.0,
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1, /* Unofficial economy rates */
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5,
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10,
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12,
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15,
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0,
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0,
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};
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/* Bitrate indexes */
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int bitrate_123[3][16] =
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{ {0,32,64,96,128,160,192,224,256,288,320,352,384,416,448,},
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{0,32,48,56, 64, 80, 96,112,128,160,192,224,256,320,384,},
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{0,32,40,48, 56, 64, 80, 96,112,128,160,192,224,256,320,} };
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static const uint16_t sequence_start = 0x01b3;
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static const uint16_t ext_sequence_start = 0x01b5;
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static const uint16_t gop_start = 0x01b8;
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static const uint16_t audio1_packet = 0x01c0;
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static const uint16_t audio2_packet = 0x01d0;
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static const uint16_t private1_packet = 0x01bd;
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static const uint16_t private2_packet = 0x01bf;
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int KMpegPlugin::parse_seq() {
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uint32_t buf;
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dstream >> buf;
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horizontal_size = (buf >> 20);
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vertical_size = (buf >> 8) & ((1<<12)-1);
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aspect_ratio = (buf >> 4) & ((1<<4)-1);
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int framerate_code = buf & ((1<<4)-1);
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frame_rate = frame_rate_table[framerate_code];
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dstream >> buf;
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bitrate = (buf >> 14);
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// kdDebug(7034) << "bitrate: " << bitrate << endl;
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bool has_intra_matrix = buf & 2;
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bool has_non_intra_matrix = buf & 1;
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int matrix = 0;
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if (has_intra_matrix) matrix +=64;
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if (has_non_intra_matrix) matrix +=64;
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mpeg = 1;
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return matrix;
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}
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void KMpegPlugin::parse_seq_ext() {
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uint32_t buf;
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dstream >> buf;
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uint8_t type = buf >> 28;
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if (type == 1)
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mpeg = 2;
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/*
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else
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if (type == 2) {
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dstream >> buf;
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// These are display-sizes. I let them override physical sizes.
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horizontal_size = (buf >> 18);
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vertical_size = (buf >> 1) & ((1<<14)-1);
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} */
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}
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long KMpegPlugin::parse_gop() {
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uint32_t buf;
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dstream >> buf;
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dstream >> buf;
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int gop_hour = (buf>>26) & ((1<<5)-1);
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kdDebug(7034) << "gop_hour: " << gop_hour << endl;
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int gop_minute = (buf>>20) & ((1<<6)-1);
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kdDebug(7034) << "gop_minute: " << gop_minute << endl;
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int gop_second = (buf>>13) & ((1<<6)-1);
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kdDebug(7034) << "gop_second: " << gop_second << endl;
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int gop_frame = (buf>>7) & ((1<<6)-1);
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kdDebug(7034) << "gop_frame: " << gop_frame << endl;
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long seconds = gop_hour*60*60 + gop_minute*60 + gop_second;
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return (long)seconds;
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}
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int KMpegPlugin::parse_audio() {
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uint16_t len;
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dstream >> len;
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// kdDebug(7034) << "Length of audio packet: " << len << endl;
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uint8_t buf;
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int i = 0;
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for(i=0; i<20; i++) {
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dstream >> buf;
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if (buf == 0xff) {
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dstream >> buf;
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if ((buf & 0xe0) == 0xe0)
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goto found_sync;
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}
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}
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kdDebug(7034) << "MPEG audio sync not found" << endl;
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return len-i;
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found_sync:
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int layer = ((buf >> 1) & 0x3);
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if (layer == 1)
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audio_type = 3;
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else if (layer == 2)
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audio_type = 2;
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else if (layer == 3)
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audio_type = 1;
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else
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kdDebug(7034) << "Invalid MPEG audio layer" << endl;
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dstream >> buf;
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int bitrate_index = (buf & 0xf0) >> 4;
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audio_rate = bitrate_123[3-layer][bitrate_index];
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return len-3-i;
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}
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int KMpegPlugin::skip_packet() {
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uint16_t len;
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dstream >> len;
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// kdDebug(7034) << "Length of skipped packet: " << len << endl;
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return len;
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}
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int KMpegPlugin::skip_riff_chunk() {
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dstream.setByteOrder(TQDataStream::LittleEndian);
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uint32_t len;
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dstream >> len;
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// std::cerr << "Length of skipped chunk: " << len << std::endl;
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dstream.setByteOrder(TQDataStream::BigEndian);
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return len;
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}
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int KMpegPlugin::parse_private() {
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uint16_t len;
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dstream >> len;
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// kdDebug(7034) << "Length of private packet: " << len << endl;
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// Match AC3 packets
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uint8_t subtype;
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dstream >> subtype;
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subtype = subtype >> 4;
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if (subtype == 8) // AC3
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audio_type = 5;
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else
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if (subtype == 10) // LPCM
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audio_type = 7;
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return len-1;
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}
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bool KMpegPlugin::find_mpeg_in_cdxa()
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{
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int skip_len = 0;
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uint32_t magic;
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uint32_t data_len;
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// search for data chunk
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while (true) {
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dstream >> magic;
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if (magic != 0x64617461) { // "fmt "
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skip_len = skip_riff_chunk();
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if (!file.at(file.at()+skip_len)) return false;
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continue;
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} else {
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// size of chunk
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dstream >> data_len;
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int block = 0;
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// search for mpeg part
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while(block < 32) {
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// check for CDXA sync thingy
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dstream >> magic;
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// 00 ff ff ff ff ff ff ff ff ff ff ff 00
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if (magic == 0x00ffffff) {
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// std::cerr << "Found CD sync" << std::endl;
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// skip 20 bytes
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if (!file.at(file.at()+20)) return false;
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dstream >> magic;
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if (magic == 0x000001ba) {
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// std::cerr << "Found CDXA mpeg" << std::endl;
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return true;
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}
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else {
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// std::cerr << "CDXA block: #" <<block << ": " << magic << std::endl;
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if (!file.at(file.at()+2324)) return false;
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block++;
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continue;
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}
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} else {
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// std::cerr << "Incorrect CDXA block" << std::endl;
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// shouldn't happen
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return true;
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}
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}
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return false;
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}
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}
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}
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bool KMpegPlugin::read_mpeg()
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{
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mpeg = 0;
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audio_type = 0;
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audio_rate = 0;
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uint32_t magic;
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dstream >> magic;
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if (magic == 0x52494646) // == "RIFF"
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{
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dstream >> magic;
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dstream >> magic;
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if (magic != 0x43445841) { // 0x43445841 == "CDXA"
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kdDebug(7034) << "Unknown RIFF file" << endl;
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return false;
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} else {
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if (!find_mpeg_in_cdxa()) return false;
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}
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}
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else
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if (magic != 0x000001ba) {
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kdDebug(7034) << "Not a MPEG-PS file" << endl;
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return false;
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}
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// file.at(0);
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uint8_t byte;
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int skip_len = 0;
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int state = 0;
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int skimmed = 0;
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int video_len = 0;
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int searched = 0;
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bool video_found = false, audio_found = false, gop_found = false;
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// Search for MPEG packets
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for(int i=0; i < 2048; i++) {
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dstream >> byte;
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skimmed++;
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searched++;
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if (video_len > 0) video_len--;
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// Use a fast state machine to find 00 00 01 sync code
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switch (state) {
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case 0:
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if (byte == 0)
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state = 1;
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else
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state = 0;
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break;
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case 1:
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if (byte == 0)
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state = 2;
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else
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state = 0;
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break;
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case 2:
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if (byte == 0)
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state = 2;
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else
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if (byte == 1)
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state = 3;
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else
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state = 0;
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break;
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case 3: {
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skimmed -= 4;
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if (skimmed) {
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// kdDebug(7034) << "Bytes skimmed:" << skimmed << endl;
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skimmed = 0;
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}
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// kdDebug(7034) << "Packet of type:" << TQString::number(byte,16) << endl;
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switch (byte) {
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case 0xb3:
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if (video_found) break;
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skip_len = parse_seq();
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video_found = true;
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video_len -= 8;
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video_len -= skip_len;
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break;
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case 0xb5:
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parse_seq_ext();
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video_len -= 4;
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break;
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case 0xb8:
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/*
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if (!gop_found) {
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start_time = parse_gop();
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gop_found = true;
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kdDebug(7034) << "start_time: " << start_time << endl;
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}
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*/
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/* nobreak */
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case 0x00:
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case 0x01:
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// skip the rest of the video data
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if (video_len > 0 && video_found)
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skip_len = video_len;
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break;
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/*
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case 0xb2:
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skip_len = parse_user();
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break;
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*/
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case 0xba:
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skip_len = 8;
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break;
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case 0xbe:
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// padding
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skip_len = skip_packet();
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break;
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case 0xe0:
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// video data
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if (video_found)
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skip_len = skip_packet();
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else
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video_len = skip_packet();
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break;
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case 0xbd:
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case 0xbf:
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skip_len = parse_private();
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break;
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case 0xc0:
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case 0xd0:
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skip_len = parse_audio();
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audio_found = true;
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break;
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default:
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// kdDebug(7034) << "Unhandled packet of type:" << TQString::number(byte,16) << endl;
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break;
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}
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state = 0;
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break;
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}
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}
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if (video_found && audio_found /*&& gop_found*/) break;
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if (skip_len) {
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if (!file.at(file.at()+skip_len))
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return false;
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searched += skip_len;
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skip_len = 0;
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}
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}
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/*
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if (skimmed)
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kdDebug(7034) << "Bytes skimmed:" << skimmed << endl;
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kdDebug(7034) << "Bytes searched:" << searched << endl;
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*/
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if (mpeg == 0) {
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kdDebug(7034) << "No sequence-start found" << endl;
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return false;
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}
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return true;
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}
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// Search for the last GOP packet and read the time field
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void KMpegPlugin::read_length()
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{
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end_time = 0;
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uint8_t byte;
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int state = 0;
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// Search for the last gop
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file.at(file.size()-1024);
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for(int j=1; j<64; j++) {
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// dstream.setDevice(&file);
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// dstream.setByteOrder(TQDataStream::BigEndian);
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for(int i=0; i<1024; i++) {
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dstream >> byte;
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switch (state) {
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case 0:
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if (byte == 0)
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state = 1;
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else
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state = 0;
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break;
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case 1:
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if (byte == 0)
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state = 2;
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else
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state = 0;
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case 2:
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if (byte == 0)
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state = 2;
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else
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if (byte == 1)
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state = 3;
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else
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state = 0;
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case 3:
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if (byte == 0xb8) {
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end_time = parse_gop();
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kdDebug(7034) << "end_time: " << end_time << endl;
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return;
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}
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state = 0;
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}
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}
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state = 0;
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file.at(file.size()-j*1024);
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}
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kdDebug(7034) << "No end GOP found" << endl;
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}
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|
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bool KMpegPlugin::readInfo( KFileMetaInfo& info, uint /*what*/)
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{
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if ( info.path().isEmpty() ) // remote file
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return false;
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file.setName(info.path());
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|
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// open file, set up stream and set endianness
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if (!file.open(IO_ReadOnly))
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{
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kdDebug(7034) << "Couldn't open " << TQFile::encodeName(info.path()).data() << endl;
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return false;
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}
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dstream.setDevice(&file);
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dstream.setByteOrder(TQDataStream::BigEndian);
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start_time = end_time = 0L;
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if (!read_mpeg()) {
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kdDebug(7034) << "read_mpeg() failed!" << endl;
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}
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else {
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KFileMetaInfoGroup group = appendGroup(info, "Technical");
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appendItem(group, "Frame rate", double(frame_rate));
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appendItem(group, "Resolution", TQSize(horizontal_size, vertical_size));
|
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/* The GOP timings are completely bogus
|
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read_length();
|
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if (end_time != 0) {
|
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//long total_frames = end_time-start_time + 1;
|
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long total_time = end_time;
|
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appendItem(group, "Length", int(total_time));
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}
|
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// and so is bitrate
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long total_time = file.size()/((bitrate+audio_rate)*50);
|
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appendItem(group, "Length", int(total_time));
|
|
*/
|
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if (mpeg == 1)
|
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appendItem(group, "Video codec", "MPEG-1");
|
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else
|
|
appendItem(group, "Video codec", "MPEG-2");
|
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|
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switch (audio_type) {
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case 1:
|
|
appendItem(group, "Audio codec", "MP1");
|
|
break;
|
|
case 2:
|
|
appendItem(group, "Audio codec", "MP2");
|
|
break;
|
|
case 3:
|
|
appendItem(group, "Audio codec", "MP3");
|
|
break;
|
|
case 5:
|
|
appendItem(group, "Audio codec", "AC3");
|
|
break;
|
|
case 7:
|
|
appendItem(group, "Audio codec", "PCM");
|
|
break;
|
|
default:
|
|
appendItem(group, "Audio codec", i18n("Unknown"));
|
|
}
|
|
// MPEG 1 also has an aspect ratio setting, but it works differently,
|
|
// and I am not sure if it is used.
|
|
if (mpeg == 2) {
|
|
switch (aspect_ratio) {
|
|
case 1:
|
|
appendItem(group, "Aspect ratio", i18n("default"));
|
|
break;
|
|
case 2:
|
|
appendItem(group, "Aspect ratio", "4/3");
|
|
break;
|
|
case 3:
|
|
appendItem(group, "Aspect ratio", "16/9");
|
|
break;
|
|
case 4:
|
|
appendItem(group, "Aspect ratio", "2.11/1");
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
file.close();
|
|
return true;
|
|
}
|
|
|
|
#include "tdefile_mpeg.moc"
|