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-rw-r--r--src/VideoMetadata.vala655
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diff --git a/src/VideoMetadata.vala b/src/VideoMetadata.vala
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--- a/src/VideoMetadata.vala
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@@ -1,655 +0,0 @@
-/* Copyright 2016 Software Freedom Conservancy Inc.
- *
- * This software is licensed under the GNU Lesser General Public License
- * (version 2.1 or later). See the COPYING file in this distribution.
- */
-
-public class VideoMetadata : MediaMetadata {
-
- private MetadataDateTime timestamp = null;
- private string title = null;
- private string comment = null;
-
- public VideoMetadata() {
- }
-
- ~VideoMetadata() {
- }
-
- public override void read_from_file(File file) throws Error {
- QuickTimeMetadataLoader quicktime = new QuickTimeMetadataLoader(file);
- if (quicktime.is_supported()) {
- timestamp = quicktime.get_creation_date_time();
- title = quicktime.get_title();
- // TODO: is there an quicktime.get_comment ??
- comment = null;
- return;
- }
- AVIMetadataLoader avi = new AVIMetadataLoader(file);
- if (avi.is_supported()) {
- timestamp = avi.get_creation_date_time();
- title = avi.get_title();
- comment = null;
- return;
- }
-
- throw new IOError.NOT_SUPPORTED("File %s is not a supported video format", file.get_path());
- }
-
- public override MetadataDateTime? get_creation_date_time() {
- return timestamp;
- }
-
- public override string? get_title() {
- return title;
- }
-
- public override string? get_comment() {
- return comment;
- }
-
-}
-
-private class QuickTimeMetadataLoader {
-
- // Quicktime calendar date/time format is number of seconds since January 1, 1904.
- // This converts to UNIX time (66 years + 17 leap days).
- public const time_t QUICKTIME_EPOCH_ADJUSTMENT = 2082844800;
-
- private File file = null;
-
- public QuickTimeMetadataLoader(File file) {
- this.file = file;
- }
-
- public MetadataDateTime? get_creation_date_time() {
- return new MetadataDateTime((time_t) get_creation_date_time_for_quicktime());
- }
-
- public string? get_title() {
- // Not supported.
- return null;
- }
-
- // Checks if the given file is a QuickTime file.
- public bool is_supported() {
- QuickTimeAtom test = new QuickTimeAtom(file);
-
- bool ret = false;
- try {
- test.open_file();
- test.read_atom();
-
- // Look for the header.
- if ("ftyp" == test.get_current_atom_name()) {
- ret = true;
- } else {
- // Some versions of QuickTime don't have
- // an ftyp section, so we'll just look
- // for the mandatory moov section.
- while(true) {
- if ("moov" == test.get_current_atom_name()) {
- ret = true;
- break;
- }
- test.next_atom();
- test.read_atom();
- if (test.is_last_atom()) {
- break;
- }
- }
- }
- } catch (GLib.Error e) {
- debug("Error while testing for QuickTime file for %s: %s", file.get_path(), e.message);
- }
-
- try {
- test.close_file();
- } catch (GLib.Error e) {
- debug("Error while closing Quicktime file: %s", e.message);
- }
- return ret;
- }
-
- private ulong get_creation_date_time_for_quicktime() {
- QuickTimeAtom test = new QuickTimeAtom(file);
- time_t timestamp = 0;
-
- try {
- test.open_file();
- bool done = false;
- while(!done) {
- // Look for "moov" section.
- test.read_atom();
- if (test.is_last_atom()) break;
- if ("moov" == test.get_current_atom_name()) {
- QuickTimeAtom child = test.get_first_child_atom();
- while (!done) {
- // Look for "mvhd" section, or break if none is found.
- child.read_atom();
- if (child.is_last_atom() || 0 == child.section_size_remaining()) {
- done = true;
- break;
- }
-
- if ("mvhd" == child.get_current_atom_name()) {
- // Skip 4 bytes (version + flags)
- child.read_uint32();
- // Grab the timestamp.
- timestamp = child.read_uint32() - QUICKTIME_EPOCH_ADJUSTMENT;
- done = true;
- break;
- }
- child.next_atom();
- }
- }
- test.next_atom();
- }
- } catch (GLib.Error e) {
- debug("Error while testing for QuickTime file: %s", e.message);
- }
-
- try {
- test.close_file();
- } catch (GLib.Error e) {
- debug("Error while closing Quicktime file: %s", e.message);
- }
-
- // Some Android phones package videos recorded with their internal cameras in a 3GP
- // container that looks suspiciously like a QuickTime container but really isn't -- for
- // the timestamps of these Android 3GP videos are relative to the UNIX epoch
- // (January 1, 1970) instead of the QuickTime epoch (January 1, 1904). So, if we detect a
- // QuickTime movie with a negative timestamp, we can be pretty sure it isn't a valid
- // QuickTime movie that was shot before 1904 but is instead a non-compliant 3GP video
- // file. If we detect such a video, we correct its time. See this Redmine ticket
- // (http://redmine.yorba.org/issues/3314) for more information.
- if (timestamp < 0)
- timestamp += QUICKTIME_EPOCH_ADJUSTMENT;
-
- return (ulong) timestamp;
- }
-}
-
-private class QuickTimeAtom {
- private GLib.File file = null;
- private string section_name = "";
- private uint64 section_size = 0;
- private uint64 section_offset = 0;
- private GLib.DataInputStream input = null;
- private QuickTimeAtom? parent = null;
-
- public QuickTimeAtom(GLib.File file) {
- this.file = file;
- }
-
- private QuickTimeAtom.with_input_stream(GLib.DataInputStream input, QuickTimeAtom parent) {
- this.input = input;
- this.parent = parent;
- }
-
- public void open_file() throws GLib.Error {
- close_file();
- input = new GLib.DataInputStream(file.read());
- input.set_byte_order(DataStreamByteOrder.BIG_ENDIAN);
- section_size = 0;
- section_offset = 0;
- section_name = "";
- }
-
- public void close_file() throws GLib.Error {
- if (null != input) {
- input.close();
- input = null;
- }
- }
-
- private void advance_section_offset(uint64 amount) {
- section_offset += amount;
- if (null != parent) {
- parent.advance_section_offset(amount);
- }
- }
-
- public QuickTimeAtom get_first_child_atom() {
- // Child will simply have the input stream
- // but not the size/offset. This works because
- // child atoms follow immediately after a header,
- // so no skipping is required to access the child
- // from the current position.
- return new QuickTimeAtom.with_input_stream(input, this);
- }
-
- public uchar read_byte() throws GLib.Error {
- advance_section_offset(1);
- return input.read_byte();
- }
-
- public uint32 read_uint32() throws GLib.Error {
- advance_section_offset(4);
- return input.read_uint32();
- }
-
- public uint64 read_uint64() throws GLib.Error {
- advance_section_offset(8);
- return input.read_uint64();
- }
-
- public void read_atom() throws GLib.Error {
- // Read atom size.
- section_size = read_uint32();
-
- // Read atom name.
- GLib.StringBuilder sb = new GLib.StringBuilder();
- sb.append_c((char) read_byte());
- sb.append_c((char) read_byte());
- sb.append_c((char) read_byte());
- sb.append_c((char) read_byte());
- section_name = sb.str;
-
- // Check string.
- if (section_name.length != 4) {
- throw new IOError.NOT_SUPPORTED("QuickTime atom name length is invalid for %s",
- file.get_path());
- }
- for (int i = 0; i < section_name.length; i++) {
- if (!section_name[i].isprint()) {
- throw new IOError.NOT_SUPPORTED("Bad QuickTime atom in file %s", file.get_path());
- }
- }
-
- if (1 == section_size) {
- // This indicates the section size is a 64-bit
- // value, specified below the atom name.
- section_size = read_uint64();
- }
- }
-
- private void skip(uint64 skip_amount) throws GLib.Error {
- skip_uint64(input, skip_amount);
- }
-
- public uint64 section_size_remaining() {
- assert(section_size >= section_offset);
- return section_size - section_offset;
- }
-
- public void next_atom() throws GLib.Error {
- skip(section_size_remaining());
- section_size = 0;
- section_offset = 0;
- }
-
- public string get_current_atom_name() {
- return section_name;
- }
-
- public bool is_last_atom() {
- return 0 == section_size;
- }
-
-}
-
-private class AVIMetadataLoader {
-
- private File file = null;
-
- // A numerical date string, i.e 2010:01:28 14:54:25
- private const int NUMERICAL_DATE_LENGTH = 19;
-
- // Marker for timestamp section in a Nikon nctg blob.
- private const uint16 NIKON_NCTG_TIMESTAMP_MARKER = 0x13;
-
- // Size limit to ensure we don't parse forever on a bad file.
- private const int MAX_STRD_LENGTH = 100;
-
- public AVIMetadataLoader(File file) {
- this.file = file;
- }
-
- public MetadataDateTime? get_creation_date_time() {
- return new MetadataDateTime((time_t) get_creation_date_time_for_avi());
- }
-
- public string? get_title() {
- // Not supported.
- return null;
- }
-
- // Checks if the given file is an AVI file.
- public bool is_supported() {
- AVIChunk chunk = new AVIChunk(file);
- bool ret = false;
- try {
- chunk.open_file();
- chunk.read_chunk();
- // Look for the header and identifier.
- if ("RIFF" == chunk.get_current_chunk_name() &&
- "AVI " == chunk.read_name()) {
- ret = true;
- }
- } catch (GLib.Error e) {
- debug("Error while testing for AVI file: %s", e.message);
- }
-
- try {
- chunk.close_file();
- } catch (GLib.Error e) {
- debug("Error while closing AVI file: %s", e.message);
- }
- return ret;
- }
-
- // Parses a Nikon nctg tag. Based losely on avi_read_nikon() in FFmpeg.
- private string read_nikon_nctg_tag(AVIChunk chunk) throws GLib.Error {
- bool found_date = false;
- while (chunk.section_size_remaining() > sizeof(uint16)*2) {
- uint16 tag = chunk.read_uint16();
- uint16 size = chunk.read_uint16();
- if (NIKON_NCTG_TIMESTAMP_MARKER == tag) {
- found_date = true;
- break;
- }
- chunk.skip(size);
- }
-
- if (found_date) {
- // Read numerical date string, example: 2010:01:28 14:54:25
- GLib.StringBuilder sb = new GLib.StringBuilder();
- for (int i = 0; i < NUMERICAL_DATE_LENGTH; i++) {
- sb.append_c((char) chunk.read_byte());
- }
- return sb.str;
- }
- return "";
- }
-
- // Parses a Fujifilm strd tag. Based on information from:
- // http://www.eden-foundation.org/products/code/film_date_stamp/index.html
- private string read_fuji_strd_tag(AVIChunk chunk) throws GLib.Error {
- chunk.skip(98); // Ignore 98-byte binary blob.
- chunk.skip(8); // Ignore the string "FUJIFILM"
- // Read until we find four colons, then two more chars.
- int colons = 0;
- int post_colons = 0;
- GLib.StringBuilder sb = new GLib.StringBuilder();
- // End of date is two chars past the fourth colon.
- while (colons <= 4 && post_colons < 2) {
- char c = (char) chunk.read_byte();
- if (4 == colons) {
- post_colons++;
- }
- if (':' == c) {
- colons++;
- }
- if (c.isprint()) {
- sb.append_c(c);
- }
- if (sb.len > MAX_STRD_LENGTH) {
- return ""; // Give up searching.
- }
- }
-
- if (sb.str.length < NUMERICAL_DATE_LENGTH) {
- return "";
- }
- // Date is now at the end of the string.
- return sb.str.substring(sb.str.length - NUMERICAL_DATE_LENGTH);
- }
-
- // Recursively read file until the section is found.
- private string? read_section(AVIChunk chunk) throws GLib.Error {
- while (true) {
- chunk.read_chunk();
- string name = chunk.get_current_chunk_name();
- if ("IDIT" == name) {
- return chunk.section_to_string();
- } else if ("nctg" == name) {
- return read_nikon_nctg_tag(chunk);
- } else if ("strd" == name) {
- return read_fuji_strd_tag(chunk);
- }
-
- if ("LIST" == name) {
- chunk.read_name(); // Read past list name.
- string result = read_section(chunk.get_first_child_chunk());
- if (null != result) {
- return result;
- }
- }
-
- if (chunk.is_last_chunk()) {
- break;
- }
- chunk.next_chunk();
- }
- return null;
- }
-
- // Parses a date from a string.
- // Largely based on GStreamer's avi/gstavidemux.c
- // and the information here:
- // http://www.eden-foundation.org/products/code/film_date_stamp/index.html
- private ulong parse_date(string sdate) {
- if (sdate.length == 0) {
- return 0;
- }
-
- Date date = Date();
- uint seconds = 0;
- int year, month, day, hour, min, sec;
- char weekday[4];
- char monthstr[4];
-
- if (sdate[0].isdigit()) {
- // Format is: 2005:08:17 11:42:43
- // Format is: 2010/11/30/ 19:42
- // Format is: 2010/11/30 19:42
- string tmp = sdate.dup();
- tmp.canon("0123456789 ", ' '); // strip everything but numbers and spaces
- sec = 0;
- int result = tmp.scanf("%d %d %d %d %d %d", out year, out month, out day, out hour, out min, out sec);
- if(result < 5) {
- return 0;
- }
- date.set_dmy((DateDay) day, (DateMonth) month, (DateYear) year);
- seconds = sec + min * 60 + hour * 3600;
- } else {
- // Format is: Mon Mar 3 09:44:56 2008
- if(7 != sdate.scanf("%3s %3s %d %d:%d:%d %d", weekday, monthstr, out day, out hour,
- out min, out sec, out year)) {
- return 0; // Error
- }
- date.set_dmy((DateDay) day, month_from_string((string) monthstr), (DateYear) year);
- seconds = sec + min * 60 + hour * 3600;
- }
-
- Time time = Time();
- date.to_time(out time);
-
- // watch for overflow (happens on quasi-bogus dates, like Year 200)
- time_t tm = time.mktime();
- ulong result = tm + seconds;
- if (result < tm) {
- debug("Overflow for timestamp in video file %s", file.get_path());
-
- return 0;
- }
-
- return result;
- }
-
- private DateMonth month_from_string(string s) {
- switch (s.down()) {
- case "jan":
- return DateMonth.JANUARY;
- case "feb":
- return DateMonth.FEBRUARY;
- case "mar":
- return DateMonth.MARCH;
- case "apr":
- return DateMonth.APRIL;
- case "may":
- return DateMonth.MAY;
- case "jun":
- return DateMonth.JUNE;
- case "jul":
- return DateMonth.JULY;
- case "aug":
- return DateMonth.AUGUST;
- case "sep":
- return DateMonth.SEPTEMBER;
- case "oct":
- return DateMonth.OCTOBER;
- case "nov":
- return DateMonth.NOVEMBER;
- case "dec":
- return DateMonth.DECEMBER;
- }
- return DateMonth.BAD_MONTH;
- }
-
- private ulong get_creation_date_time_for_avi() {
- AVIChunk chunk = new AVIChunk(file);
- ulong timestamp = 0;
- try {
- chunk.open_file();
- chunk.nonsection_skip(12); // Advance past 12 byte header.
- string sdate = read_section(chunk);
- if (null != sdate) {
- timestamp = parse_date(sdate.strip());
- }
- } catch (GLib.Error e) {
- debug("Error while reading AVI file: %s", e.message);
- }
-
- try {
- chunk.close_file();
- } catch (GLib.Error e) {
- debug("Error while closing AVI file: %s", e.message);
- }
- return timestamp;
- }
-}
-
-private class AVIChunk {
- private GLib.File file = null;
- private string section_name = "";
- private uint64 section_size = 0;
- private uint64 section_offset = 0;
- private GLib.DataInputStream input = null;
- private AVIChunk? parent = null;
- private const int MAX_STRING_TO_SECTION_LENGTH = 1024;
-
- public AVIChunk(GLib.File file) {
- this.file = file;
- }
-
- private AVIChunk.with_input_stream(GLib.DataInputStream input, AVIChunk parent) {
- this.input = input;
- this.parent = parent;
- }
-
- public void open_file() throws GLib.Error {
- close_file();
- input = new GLib.DataInputStream(file.read());
- input.set_byte_order(DataStreamByteOrder.LITTLE_ENDIAN);
- section_size = 0;
- section_offset = 0;
- section_name = "";
- }
-
- public void close_file() throws GLib.Error {
- if (null != input) {
- input.close();
- input = null;
- }
- }
-
- public void nonsection_skip(uint64 skip_amount) throws GLib.Error {
- skip_uint64(input, skip_amount);
- }
-
- public void skip(uint64 skip_amount) throws GLib.Error {
- advance_section_offset(skip_amount);
- skip_uint64(input, skip_amount);
- }
-
- public AVIChunk get_first_child_chunk() {
- return new AVIChunk.with_input_stream(input, this);
- }
-
- private void advance_section_offset(uint64 amount) {
- if ((section_offset + amount) > section_size)
- amount = section_size - section_offset;
-
- section_offset += amount;
- if (null != parent) {
- parent.advance_section_offset(amount);
- }
- }
-
- public uchar read_byte() throws GLib.Error {
- advance_section_offset(1);
- return input.read_byte();
- }
-
- public uint16 read_uint16() throws GLib.Error {
- advance_section_offset(2);
- return input.read_uint16();
- }
-
- public void read_chunk() throws GLib.Error {
- // don't use checked reads here because they advance the section offset, which we're trying
- // to determine here
- GLib.StringBuilder sb = new GLib.StringBuilder();
- sb.append_c((char) input.read_byte());
- sb.append_c((char) input.read_byte());
- sb.append_c((char) input.read_byte());
- sb.append_c((char) input.read_byte());
- section_name = sb.str;
- section_size = input.read_uint32();
- section_offset = 0;
- }
-
- public string read_name() throws GLib.Error {
- GLib.StringBuilder sb = new GLib.StringBuilder();
- sb.append_c((char) read_byte());
- sb.append_c((char) read_byte());
- sb.append_c((char) read_byte());
- sb.append_c((char) read_byte());
- return sb.str;
- }
-
- public void next_chunk() throws GLib.Error {
- skip(section_size_remaining());
- section_size = 0;
- section_offset = 0;
- }
-
- public string get_current_chunk_name() {
- return section_name;
- }
-
- public bool is_last_chunk() {
- return section_size == 0;
- }
-
- public uint64 section_size_remaining() {
- assert(section_size >= section_offset);
- return section_size - section_offset;
- }
-
- // Reads section contents into a string.
- public string section_to_string() throws GLib.Error {
- GLib.StringBuilder sb = new GLib.StringBuilder();
- while (section_offset < section_size) {
- sb.append_c((char) read_byte());
- if (sb.len > MAX_STRING_TO_SECTION_LENGTH) {
- return sb.str;
- }
- }
- return sb.str;
- }
-
-}
-
generated by cgit v1.2.3 (git 2.25.1) at 2024-05-19 17:23:58 +0000