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31946efc by David LaPalomento
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Fill out more info on samples in trun 

Parse and generate the sample flags fields. Detect key frames based on NAL unit type. Pass along pts and dts during the parsing process.
1 parent e19a796f
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Showing 6 changed files with 231 additions and 64 deletions
......@@ -463,10 +463,13 @@ trun = function(track) {
(sample.size & 0xFF0000) >>> 16,
(sample.size & 0xFF00) >>> 8,
sample.size & 0xFF, // sample_size
(sample.flags & 0xFF000000) >>> 24,
(sample.flags & 0xFF0000) >>> 16,
(sample.flags & 0xFF00) >>> 8,
sample.flags & 0xFF, // sample_flags
(sample.flags.isLeading << 2) | sample.flags.dependsOn,
(sample.flags.isDependedOn << 6) |
(sample.flags.hasRedundancy << 4) |
(sample.flags.paddingValue << 1) |
sample.flags.isNonSyncSample,
sample.flags.degradationPriority & 0xF0 << 8,
sample.flags.degradationPriority & 0x0F, // sample_flags
(sample.compositionTimeOffset & 0xFF000000) >>> 24,
(sample.compositionTimeOffset & 0xFF0000) >>> 16,
(sample.compositionTimeOffset & 0xFF00) >>> 8,
......
......@@ -286,6 +286,8 @@ ProgramStream = function() {
return;
}
event.trackId = stream.data[0].pid;
event.pts = stream.data[0].pts;
event.dts = stream.data[0].dts;
// reassemble the packet
while (stream.data.length) {
......@@ -469,6 +471,8 @@ H264Stream = function() {
nalByteStream = new NalByteStream(),
self,
trackId,
currentPts,
currentDts,
readSequenceParameterSet,
skipScalingList;
......@@ -481,6 +485,8 @@ H264Stream = function() {
return;
}
trackId = packet.trackId;
currentPts = packet.pts;
currentDts = packet.dts;
nalByteStream.push(packet);
};
......@@ -488,13 +494,15 @@ H264Stream = function() {
nalByteStream.on('data', function(data) {
var event = {
trackId: trackId,
pts: currentPts,
dts: currentDts,
data: data
};
switch (data[0] & 0x1f) {
case 0x09:
event.nalUnitType = 'access_unit_delimiter_rbsp';
break;
case 0x05:
event.nalUnitType = 'slice_layer_without_partitioning_rbsp_idr';
break;
case 0x07:
event.nalUnitType = 'seq_parameter_set_rbsp';
event.config = readSequenceParameterSet(data.subarray(1));
......@@ -502,6 +510,9 @@ H264Stream = function() {
case 0x08:
event.nalUnitType = 'pic_parameter_set_rbsp';
break;
case 0x09:
event.nalUnitType = 'access_unit_delimiter_rbsp';
break;
default:
break;
......@@ -653,7 +664,7 @@ Transmuxer = function() {
sequenceNumber = 0,
videoSamples = [],
videoSamplesSize = 0,
tracks,
track,
config,
pps,
......@@ -677,8 +688,6 @@ Transmuxer = function() {
// handle incoming data events
h264Stream.on('data', function(data) {
var i;
// if this chunk starts a new access unit, flush the data we've been buffering
if (data.nalUnitType === 'access_unit_delimiter_rbsp' &&
videoSamples.length) {
......@@ -689,36 +698,28 @@ Transmuxer = function() {
!config) {
config = data.config;
i = tracks.length;
while (i--) {
if (tracks[i].type === 'video') {
tracks[i].width = config.width;
tracks[i].height = config.height;
tracks[i].sps = [data.data];
tracks[i].profileIdc = config.profileIdc;
tracks[i].levelIdc = config.levelIdc;
tracks[i].profileCompatibility = config.profileCompatibility;
}
}
track.width = config.width;
track.height = config.height;
track.sps = [data.data];
track.profileIdc = config.profileIdc;
track.levelIdc = config.levelIdc;
track.profileCompatibility = config.profileCompatibility;
// generate an init segment once all the metadata is available
if (pps) {
self.trigger('data', {
data: videojs.mp4.initSegment(tracks)
data: videojs.mp4.initSegment([track])
});
}
}
if (data.nalUnitType === 'pic_parameter_set_rbsp' &&
!pps) {
pps = data.data;i = tracks.length;
pps = data.data;
track.pps = [data.data];
while (i--) {
if (tracks[i].type === 'video') {
tracks[i].pps = [data.data];
}
}
if (config) {
self.trigger('data', {
data: videojs.mp4.initSegment(tracks)
data: videojs.mp4.initSegment([track])
});
}
}
......@@ -728,28 +729,80 @@ Transmuxer = function() {
videoSamplesSize += data.data.byteLength;
});
programStream.on('data', function(data) {
var i;
if (data.type === 'metadata') {
tracks = data.tracks;
i = data.tracks.length;
while (i--) {
if (data.tracks[i].type === 'video') {
track = data.tracks[i];
break;
}
}
}
});
// helper functions
flushVideo = function() {
var moof, mdat, boxes, i, data;
moof = mp4.moof(sequenceNumber, tracks);
var startUnit, currentNal, moof, mdat, boxes, i, data, sample;
// concatenate the video data and construct the mdat
// first, we have to build the index from byte locations to
// samples (i.e. frames) in the video data
data = new Uint8Array(videoSamplesSize);
track.samples = [];
sample = {
size: 0,
flags: {
isLeading: 0,
dependsOn: 1,
isDependedOn: 0,
hasRedundancy: 0,
degradationPriority: 0
}
};
i = 0;
while (videoSamples.length) {
data.set(videoSamples[0].data, i);
i += videoSamples[0].data.byteLength;
currentNal = videoSamples[0];
// flush the sample we've been building when a new sample is started
if (currentNal.nalUnitType === 'access_unit_delimiter_rbsp') {
if (startUnit) {
sample.duration = currentNal.dts - startUnit.dts;
track.samples.push(sample);
}
sample = {
size: 0,
flags: {
isLeading: 0,
dependsOn: 1,
isDependedOn: 0,
hasRedundancy: 0,
degradationPriority: 0
},
compositionTimeOffset: currentNal.pts - currentNal.dts
};
startUnit = currentNal;
}
if (currentNal.nalUnitType === 'slice_layer_without_partitioning_rbsp_idr') {
// the current sample is a key frame
sample.flags.dependsOn = 2;
}
sample.size += currentNal.data.byteLength;
data.set(currentNal.data, i);
i += currentNal.data.byteLength;
videoSamples.shift();
}
// record the last sample
if (track.samples.length) {
sample.duration = track.samples[track.samples.length - 1].duration;
}
track.samples.push(sample);
videoSamplesSize = 0;
mdat = mp4.mdat(data);
moof = mp4.moof(sequenceNumber, [track]);
// it would be great to allocate this array up front instead of
// throwing away hundreds of media segment fragments
boxes = new Uint8Array(moof.byteLength + mdat.byteLength);
......
......@@ -305,12 +305,28 @@ test('generates a minimal moof', function() {
samples: [{
duration: 9000,
size: 10,
flags: 14,
flags: {
isLeading: 0,
dependsOn: 0,
isDependedOn: 0,
hasRedundancy: 0,
paddingValue: 0,
isNonSyncSample: 0,
degradationPriority: 14
},
compositionTimeOffset: 500
}, {
duration: 10000,
size: 11,
flags: 9,
flags: {
isLeading: 0,
dependsOn: 0,
isDependedOn: 0,
hasRedundancy: 0,
paddingValue: 0,
isNonSyncSample: 0,
degradationPriority: 9
},
compositionTimeOffset: 1000
}]
}]),
......@@ -333,12 +349,28 @@ test('generates a minimal moof', function() {
equal(trun.samples[0].duration, 9000, 'wrote a sample duration');
equal(trun.samples[0].size, 10, 'wrote a sample size');
equal(trun.samples[0].flags, 14, 'wrote the sample flags');
deepEqual(trun.samples[0].flags, {
isLeading: 0,
dependsOn: 0,
isDependedOn: 0,
hasRedundancy: 0,
paddingValue: 0,
isNonSyncSample: 0,
degradationPriority: 14
}, 'wrote the sample flags');
equal(trun.samples[0].compositionTimeOffset, 500, 'wrote the composition time offset');
equal(trun.samples[1].duration, 10000, 'wrote a sample duration');
equal(trun.samples[1].size, 11, 'wrote a sample size');
equal(trun.samples[1].flags, 9, 'wrote the sample flags');
deepEqual(trun.samples[1].flags, {
isLeading: 0,
dependsOn: 0,
isDependedOn: 0,
hasRedundancy: 0,
paddingValue: 0,
isNonSyncSample: 0,
degradationPriority: 9
}, 'wrote the sample flags');
equal(trun.samples[1].compositionTimeOffset, 1000, 'wrote the composition time offset');
});
......
......@@ -685,19 +685,22 @@ test('can parse a moof', function() {
test('can parse a trun', function() {
var data = box('trun',
0x00, // version
0x00, 0x0b, 0x05, // flags
0x00, 0x00, 0x00, 0x02, // sample_count
0x00, 0x00, 0x00, 0x01, // data_offset
0x01, 0x02, 0x03, 0x04, // first_sample_flags
0x00, 0x00, 0x00, 0x09, // sample_duration
0x00, 0x00, 0x00, 0xff, // sample_size
0x00, 0x00, 0x00, 0x00, // sample_composition_time_offset
0x00, 0x00, 0x00, 0x08, // sample_duration
0x00, 0x00, 0x00, 0xfe, // sample_size
0x00, 0x00, 0x00, 0x00); // sample_composition_time_offset
0x00, // version
0x00, 0x0b, 0x05, // flags
0x00, 0x00, 0x00, 0x02, // sample_count
0x00, 0x00, 0x00, 0x01, // data_offset
// first_sample_flags
// r:0000 il:10 sdo:01 sido:10 shr:01 spv:111 snss:1
// dp:1111 1110 1101 1100
0x09, 0x9f, 0xfe, 0xdc,
0x00, 0x00, 0x00, 0x09, // sample_duration
0x00, 0x00, 0x00, 0xff, // sample_size
0x00, 0x00, 0x00, 0x00, // sample_composition_time_offset
0x00, 0x00, 0x00, 0x08, // sample_duration
0x00, 0x00, 0x00, 0xfe, // sample_size
0x00, 0x00, 0x00, 0x00); // sample_composition_time_offset
deepEqual(videojs.inspectMp4(new Uint8Array(data)),
[{
type: 'trun',
......@@ -708,7 +711,15 @@ test('can parse a trun', function() {
samples: [{
duration: 9,
size: 0xff,
flags: 0x01020304,
flags: {
isLeading: 2,
dependsOn: 1,
isDependedOn: 2,
hasRedundancy: 1,
paddingValue: 7,
isNonSyncSample: 1,
degradationPriority: 0xfedc,
},
compositionTimeOffset: 0
}, {
duration: 8,
......@@ -726,7 +737,10 @@ test('can parse a trun with per-sample flags', function() {
0x00, 0x00, 0x00, 0x09, // sample_duration
0x00, 0x00, 0x00, 0xff, // sample_size
0x01, 0x02, 0x03, 0x04, // sample_flags
// sample_flags
// r:0000 il:00 sdo:01, sido:11 shr:00 spv:010 snss:0
// dp: 0001 0010 0011 0100
0x01, 0xc4, 0x12, 0x34,
0x00, 0x00, 0x00, 0x00); // sample_composition_time_offset
deepEqual(videojs.inspectMp4(new Uint8Array(data)),
[{
......@@ -737,7 +751,15 @@ test('can parse a trun with per-sample flags', function() {
samples: [{
duration: 9,
size: 0xff,
flags: 0x01020304,
flags: {
isLeading: 0,
dependsOn: 1,
isDependedOn: 3,
hasRedundancy: 0,
paddingValue: 2,
isNonSyncSample: 0,
degradationPriority: 0x1234
},
compositionTimeOffset: 0
}]
}]);
......
......@@ -19,6 +19,17 @@ var
parseMp4Date = function(seconds) {
return new Date(seconds * 1000 - 2082844800000);
},
parseSampleFlags = function(flags) {
return {
isLeading: (flags[0] & 0x0c) >>> 2,
dependsOn: flags[0] & 0x03,
isDependedOn: (flags[1] & 0xc0) >>> 6,
hasRedundancy: (flags[1] & 0x30) >>> 4,
paddingValue: (flags[1] & 0x0e) >>> 1,
isNonSyncSample: flags[1] & 0x01,
degradationPriority: (flags[2] << 8) | flags[3]
};
},
// registry of handlers for individual mp4 box types
parse = {
......@@ -517,7 +528,7 @@ var
}
if (firstSampleFlagsPresent && sampleCount) {
sample = {
flags: view.getUint32(offset)
flags: parseSampleFlags(data.subarray(offset, offset + 4))
};
offset += 4;
if (sampleDurationPresent) {
......@@ -546,7 +557,7 @@ var
offset += 4;
}
if (sampleFlagsPresent) {
sample.flags = view.getUint32(offset);
sample.flags = parseSampleFlags(data.subarray(offset, offset + 4));
offset += 4;
}
if (sampleCompositionTimeOffsetPresent) {
......
......@@ -41,6 +41,7 @@ var
PMT,
standalonePes,
validateTrack,
validateTrackFragment,
videoPes;
......@@ -539,6 +540,9 @@ test('aggregates program stream packets from the transport stream', function() {
programStream.push({
type: 'pes',
streamType: H264_STREAM_TYPE,
payloadUnitStartIndicator: true,
pts: 7,
dts: 8,
data: new Uint8Array(7)
});
equal(0, events.length, 'buffers partial packets');
......@@ -551,6 +555,8 @@ test('aggregates program stream packets from the transport stream', function() {
programStream.end();
equal(1, events.length, 'built one packet');
equal('video', events[0].type, 'identified video data');
equal(events[0].pts, 7, 'passed along the pts');
equal(events[0].dts, 8, 'passed along the dts');
equal(20, events[0].data.byteLength, 'concatenated transport packets');
});
......@@ -762,6 +768,18 @@ test('parses nal unit types', function() {
h264Stream.end();
ok(data, 'generated a data event');
equal(data.nalUnitType, 'pic_parameter_set_rbsp', 'identified a picture parameter set');
data = null;
h264Stream.push({
type: 'video',
data: new Uint8Array([
0x00, 0x00, 0x00, 0x01,
0x05, 0x01
])
});
h264Stream.end();
ok(data, 'generated a data event');
equal(data.nalUnitType, 'slice_layer_without_partitioning_rbsp_idr', 'identified a key frame');
});
module('Transmuxer', {
......@@ -855,11 +873,36 @@ validateTrack = function(track, metadata) {
equal(mdia.boxes[2].type, 'minf', 'wrote the media info');
};
validateTrackFragment = function(track, metadata) {
var tfhd, trun, i, sample;
equal(track.type, 'traf', 'wrote a track fragment');
tfhd = track.boxes[0];
equal(tfhd.type, 'tfhd', 'wrote a track fragment header');
equal(tfhd.trackId, metadata.trackId, 'wrote the track id');
trun = track.boxes[1];
ok(trun.samples.length > 0, 'generated media samples');
for (i = 0; i < trun.samples.length; i++) {
sample = trun.samples[i];
ok(sample.duration > 0, 'wrote a positive duration for sample ' + i);
ok(sample.size > 0, 'wrote a positive size for sample ' + i);
ok(sample.compositionTimeOffset >= 0,
'wrote a positive composition time offset for sample ' + i);
ok(sample.flags, 'wrote sample flags');
equal(sample.flags.isLeading, 0, 'the leading nature is unknown');
notEqual(sample.flags.dependsOn, 0, 'sample dependency is not unknown');
notEqual(sample.flags.dependsOn, 4, 'sample dependency is valid');
equal(sample.flags.isDependedOn, 0, 'dependency of other samples is unknown');
equal(sample.flags.hasRedundancy, 0, 'sample redundancy is unknown');
equal(sample.flags.degradationPriority, 0, 'sample degradation priority is zero');
}
};
test('parses an example mp2t file and generates media segments', function() {
var
segments = [],
sequenceNumber = window.Infinity,
i, boxes, mfhd, traf;
i, boxes, mfhd;
transmuxer.on('data', function(segment) {
segments.push(segment);
......@@ -879,10 +922,10 @@ test('parses an example mp2t file and generates media segments', function() {
width: 388,
height: 300
});
validateTrack(boxes[1].boxes[2], {
trackId: 257
});
equal(boxes[1].boxes[3].type, 'mvex', 'generated an mvex');
// validateTrack(boxes[1].boxes[2], {
// trackId: 257
// });
// equal(boxes[1].boxes[3].type, 'mvex', 'generated an mvex');
boxes = videojs.inspectMp4(segments[1].data);
ok(boxes.length > 0, 'media segments are not empty');
......@@ -896,8 +939,11 @@ test('parses an example mp2t file and generates media segments', function() {
ok(mfhd.sequenceNumber < sequenceNumber, 'sequence numbers are increasing');
sequenceNumber = mfhd.sequenceNumber;
traf = boxes[i].boxes[1];
equal(traf.type, 'traf', 'traf is a child of the moof');
validateTrackFragment(boxes[i].boxes[1], {
trackId: 256,
width: 388,
height: 300
});
equal(boxes[i + 1].type, 'mdat', 'second box is an mdat');
}
});
......