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fixes to mp4 generation

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* typo: the subtitle should use its own mdhd, not alias the video one
* use 64-bit ints for the edit lists; the 32-bit values overflow at 13.25 hours
* use etags that reflect the edit list
This commit is contained in:
Scott Lamb 2016-10-18 20:28:25 -07:00
parent 0aadf227c1
commit 6b6137f8e7
2 changed files with 32 additions and 26 deletions
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33
src/mp4-test.cc
View File

@ -344,6 +344,16 @@ TEST_F(IntegrationTest, RoundTrip) {
recording, 0, std::numeric_limits<int32_t>::max(), false);
WriteMp4(f.get());
CompareMp4s(0);
// This test is brittle, which is the point. Any time the digest comparison
// here fails, it can be updated, but the etag must change as well!
// Otherwise clients may combine ranges from the new format with ranges
// from the old format!
EXPECT_EQ("1e5331e8371bd97ac3158b3a86494abc87cdc70e", Digest(f.get()));
EXPECT_EQ("\"268db2cd6e4814676d38832f1f9340c7555e4e71\"", f->etag());
// 10 seconds later than the segment's start time.
EXPECT_EQ(1430006410, f->last_modified());
}
TEST_F(IntegrationTest, RoundTripWithSubtitle) {
@ -355,6 +365,13 @@ TEST_F(IntegrationTest, RoundTripWithSubtitle) {
recording, 0, std::numeric_limits<int32_t>::max(), true);
WriteMp4(f.get());
CompareMp4s(0);
// This test is brittle, which is the point. Any time the digest comparison
// here fails, it can be updated, but the etag must change as well!
// Otherwise clients may combine ranges from the new format with ranges
// from the old format!
EXPECT_EQ("0081a442ba73092027fc580eeac2ebf25cb1ef50", Digest(f.get()));
EXPECT_EQ("\"8a29042355e1e28c10fbba328d1ddc9d54e450cd\"", f->etag());
}
TEST_F(IntegrationTest, RoundTripWithEditList) {
@ -366,25 +383,13 @@ TEST_F(IntegrationTest, RoundTripWithEditList) {
recording, 1, std::numeric_limits<int32_t>::max(), false);
WriteMp4(f.get());
CompareMp4s(-1);
}
TEST_F(IntegrationTest, Metadata) {
Recording recording = CopyMp4ToSingleRecording();
if (HasFailure()) {
return;
}
auto f = CreateMp4FromSingleRecording(
recording, 0, std::numeric_limits<int32_t>::max(), false);
// This test is brittle, which is the point. Any time the digest comparison
// here fails, it can be updated, but the etag must change as well!
// Otherwise clients may combine ranges from the new format with ranges
// from the old format!
EXPECT_EQ("1e5331e8371bd97ac3158b3a86494abc87cdc70e", Digest(f.get()));
EXPECT_EQ("\"a9ce99a83a177516e7f862fed405e2b47b7d4ae3\"", f->etag());
// 10 seconds later than the segment's start time.
EXPECT_EQ(1430006410, f->last_modified());
EXPECT_EQ("685e026af44204bc9cc52115c5e17058e9fb7c70", Digest(f.get()));
EXPECT_EQ("\"1373289ddc7c05580deeeb1f1624e2d6cac7ddd3\"", f->etag());
}
} // namespace

25
src/mp4.cc
View File

@ -298,10 +298,10 @@ struct EditBox { // ISO/IEC 14496-12 section 8.6.5, edts.
const char type[4] = {'e', 'd', 't', 's'};
} __attribute__((packed));
struct EditListBoxVersion0 { // ISO/IEC 14496-12 section 8.6.6, elst.
struct EditListBoxVersion1 { // ISO/IEC 14496-12 section 8.6.6, elst.
uint32_t size = NET_UINT32_C(0);
const char type[4] = {'e', 'l', 's', 't'};
const uint32_t version_and_flags = NET_UINT32_C(0);
const uint32_t version_and_flags = NET_UINT32_C(1 << 24);
uint32_t entry_count = NET_UINT32_C(0);
};
@ -542,8 +542,9 @@ class Mp4File : public VirtualFile {
std::string segment_times;
for (const auto &segment : segments_) {
segment_times.clear();
Append64(segment->pieces.sample_pos().begin, &segment_times);
Append64(segment->pieces.sample_pos().end, &segment_times);
Append64(segment->recording.start_time_90k, &segment_times);
Append32(segment->rel_start_90k, &segment_times);
Append32(segment->pieces.end_90k(), &segment_times);
etag_digest->Update(segment_times);
etag_digest->Update(segment->recording.sample_file_sha1);
}
@ -609,11 +610,11 @@ class Mp4File : public VirtualFile {
void MaybeAppendVideoEdts() {
struct Entry {
Entry(int32_t segment_duration, int32_t media_time)
Entry(int64_t segment_duration, int64_t media_time)
: segment_duration(segment_duration), media_time(media_time) {}
int32_t segment_duration = 0;
int32_t media_time = 0;
int32_t end() const { return segment_duration + media_time; }
int64_t segment_duration = 0;
int64_t media_time = 0;
int64_t end() const { return segment_duration + media_time; }
};
std::vector<Entry> entries;
int64_t cur_media_time = 0;
@ -640,8 +641,8 @@ class Mp4File : public VirtualFile {
for (const auto &entry : entries) {
VLOG(2) << "...duration=" << entry.segment_duration
<< ", time=" << entry.media_time;
AppendU32(entry.segment_duration, s);
AppendU32(entry.media_time, s);
AppendU64(entry.segment_duration, s);
AppendU64(entry.media_time, s);
AppendU16(1, s); // media_rate_integer
AppendU16(1, s); // media_rate_fraction
}
@ -761,7 +762,7 @@ class Mp4File : public VirtualFile {
{
CONSTRUCT_BOX(moov_subtitle_trak_mdia_);
{
CONSTRUCT_BOX(moov_video_trak_mdia_mdhd_);
CONSTRUCT_BOX(moov_subtitle_trak_mdia_mdhd_);
moov_subtitle_trak_mdia_mdhd_.header().creation_time = net_creation_ts;
moov_subtitle_trak_mdia_mdhd_.header().modification_time =
net_creation_ts;
@ -903,7 +904,7 @@ class Mp4File : public VirtualFile {
Mp4Box<TrackBox> moov_video_trak_;
Mp4Box<TrackHeaderBoxVersion0> moov_video_trak_tkhd_;
Mp4Box<EditBox> moov_video_trak_edts_;
Mp4Box<EditListBoxVersion0> moov_video_trak_edts_elst_;
Mp4Box<EditListBoxVersion1> moov_video_trak_edts_elst_;
StringPieceSlice moov_video_trak_edts_elst_entries_;
std::string moov_video_trak_edts_elst_entries_str_;
Mp4Box<MediaBox> moov_video_trak_mdia_;