/// <summary>
/// Tag sequence
/// MetaData, Video config, Audio config, remaining audio and video
///
/// Packet prefixes:
/// 17 00 00 00 00 = Video extra data (first video packet)
/// 17 01 00 00 00 = Video keyframe
/// 27 01 00 00 00 = Video interframe
/// af 00 ... 06 = Audio extra data (first audio packet)
/// af 01 = Audio frame
///
/// Audio extra data(s):
/// af 00 = Prefix
/// 11 90 4f 14 = AAC Main = aottype 0
/// 12 10 = AAC LC = aottype 1
/// 13 90 56 e5 a5 48 00 = HE-AAC SBR = aottype 2
/// 06 = Suffix
///
/// Still not absolutely certain about this order or the bytes - need to verify later
/// </summary>
private void CreatePreStreamingTags()
{
#if !SILVERLIGHT
log.Debug("Creating pre-streaming tags");
#endif
ITag tag = null;
//byte[] body = null;
ByteBuffer body;
if (_hasVideo)
{
//video tag #1
body = ByteBuffer.Allocate(41);
body.AutoExpand = true;
body.Put(PREFIX_VIDEO_CONFIG_FRAME);
if (_videoDecoderBytes != null)
{
body.Put(_videoDecoderBytes);
}
tag = new Tag(IOConstants.TYPE_VIDEO, 0, (int)body.Length, body.ToArray(), 0);
//add tag
_firstTags.AddLast(tag);
}
if (_hasAudio)
{
//audio tag #1
body = ByteBuffer.Allocate(7);
body.AutoExpand = true;
body.Put(new byte[] { (byte)0xaf, (byte)0 }); //prefix
if (_audioDecoderBytes != null)
{
body.Put(_audioDecoderBytes);
}
else
{
//default to aac-lc when the esds doesn't contain descriptor bytes
//Array.Copy(AUDIO_CONFIG_FRAME_AAC_LC, 0, body, PREFIX_AUDIO_FRAME.Length, AUDIO_CONFIG_FRAME_AAC_LC.Length);
//body[PREFIX_AUDIO_FRAME.Length + AUDIO_CONFIG_FRAME_AAC_LC.Length] = 0x06; //suffix
body.Put(AUDIO_CONFIG_FRAME_AAC_LC);
}
body.Put((byte)0x06); //suffix
tag = new Tag(IOConstants.TYPE_AUDIO, 0, (int)body.Length, body.ToArray(), tag.BodySize);
//add tag
_firstTags.AddLast(tag);
}
}
/// <summary>
/// Packages media data for return to providers.
/// </summary>
/// <returns></returns>
public ITag ReadTag()
{
lock (this.SyncRoot)
{
ITag tag = null;
//empty-out the pre-streaming tags first
if (_firstTags.Count > 0)
{
//log.debug("Returning pre-tag");
// Return first tags before media data
tag = _firstTags.First.Value;
_firstTags.RemoveFirst();
return tag;
}
//log.debug("Read tag - sample {} prevFrameSize {} audio: {} video: {}", new Object[]{currentSample, prevFrameSize, audioCount, videoCount});
//get the current frame
Mp4Frame frame = _frames[_currentFrame];
#if !SILVERLIGHT
log.Debug(string.Format("Playback #{0} {1}", _currentFrame, frame));
#endif
int sampleSize = frame.Size;
int time = (int)Math.Round(frame.Time * 1000.0);
//log.debug("Read tag - dst: {} base: {} time: {}", new Object[]{frameTs, baseTs, time});
long samplePos = frame.Offset;
//log.debug("Read tag - samplePos {}", samplePos);
//determine frame type and packet body padding
byte type = frame.Type;
//assume video type
int pad = 5;
if (type == IOConstants.TYPE_AUDIO)
{
pad = 2;
}
//create a byte buffer of the size of the sample
byte[] data = new byte[sampleSize + pad];
try
{
//prefix is different for keyframes
if (type == IOConstants.TYPE_VIDEO)
{
if (frame.IsKeyFrame)
{
//log.debug("Writing keyframe prefix");
Array.Copy(PREFIX_VIDEO_KEYFRAME, data, PREFIX_VIDEO_KEYFRAME.Length);
}
else
{
//log.debug("Writing interframe prefix");
Array.Copy(PREFIX_VIDEO_FRAME, data, PREFIX_VIDEO_FRAME.Length);
}
_videoCount++;
}
else
{
//log.debug("Writing audio prefix");
Array.Copy(PREFIX_AUDIO_FRAME, data, PREFIX_AUDIO_FRAME.Length);
_audioCount++;
}
//do we need to add the mdat offset to the sample position?
_stream.Position = samplePos;
_stream.Read(data, pad, sampleSize);
}
catch (Exception ex)
{
#if !SILVERLIGHT
log.Error("Error on channel position / read", ex);
#endif
}
//create the tag
tag = new Tag(type, time, data.Length, data, _prevFrameSize);
//log.debug("Read tag - type: {} body size: {}", (type == TYPE_AUDIO ? "Audio" : "Video"), tag.getBodySize());
//increment the frame number
_currentFrame++;
//set the frame / tag size
_prevFrameSize = tag.BodySize;
//log.debug("Tag: {}", tag);
return tag;
}
}
/// <summary>
/// Push message through pipe.
/// Synchronize this method to avoid FLV corruption from abrupt disconnection.
/// </summary>
/// <param name="pipe">Pipe.</param>
/// <param name="message">Message to push.</param>
public void PushMessage(IPipe pipe, IMessage message)
{
lock (this.SyncRoot)
{
if (message is ResetMessage)
{
_startTimestamp = -1;
_offset += _lastTimestamp;
return;
}
else if (message is StatusMessage)
{
return;
}
if (!(message is RtmpMessage))
return;
if (_writer == null)
{
Init();
}
FluorineFx.Messaging.Rtmp.Stream.Messages.RtmpMessage rtmpMsg = message as FluorineFx.Messaging.Rtmp.Stream.Messages.RtmpMessage;
IRtmpEvent msg = rtmpMsg.body;
if (_startTimestamp == -1)
{
_startTimestamp = msg.Timestamp;
}
int timestamp = msg.Timestamp - _startTimestamp;
if (timestamp < 0)
{
log.Warn("Skipping message with negative timestamp.");
return;
}
_lastTimestamp = timestamp;
ITag tag = new Tag();
tag.DataType = (byte)msg.DataType;
tag.Timestamp = timestamp + _offset;
if (msg is IStreamData)
{
ByteBuffer data = (msg as IStreamData).Data;
tag.Body = data.ToArray();
}
try
{
_writer.WriteTag(tag);
}
catch (IOException ex)
{
log.Error("Error writing tag", ex);
}
}
}
/// <summary>
/// Create tag for metadata event.
///
/// Info from http://www.kaourantin.net/2007/08/what-just-happened-to-video-on-web_20.html
/// <para>
/// duration - Obvious. But unlike for FLV files this field will always be present.
/// videocodecid - For H.264 we report 'avc1'.
/// audiocodecid - For AAC we report 'mp4a', for MP3 we report '.mp3'.
/// avcprofile - 66, 77, 88, 100, 110, 122 or 144 which corresponds to the H.264 profiles.
/// avclevel - A number between 10 and 51. Consult this list to find out more.
/// aottype - Either 0, 1 or 2. This corresponds to AAC Main, AAC LC and SBR audio types.
/// moovposition - The offset in bytes of the moov atom in a file.
/// trackinfo - An array of objects containing various infomation about all the tracks in a file
/// ex.
/// trackinfo[0].length: 7081
/// trackinfo[0].timescale: 600
/// trackinfo[0].sampledescription.sampletype: avc1
/// trackinfo[0].language: und
/// trackinfo[1].length: 525312
/// trackinfo[1].timescale: 44100
/// trackinfo[1].sampledescription.sampletype: mp4a
/// trackinfo[1].language: und
///
/// chapters - As mentioned above information about chapters in audiobooks.
/// seekpoints - As mentioned above times you can directly feed into NetStream.seek();
/// videoframerate - The frame rate of the video if a monotone frame rate is used. Most videos will have a monotone frame rate.
/// audiosamplerate - The original sampling rate of the audio track.
/// audiochannels - The original number of channels of the audio track.
/// tags - As mentioned above ID3 like tag information.
/// </para>
///
/// <para>
/// width: Display width in pixels.
/// height: Display height in pixels.
/// duration: Duration in seconds.
/// avcprofile: AVC profile number such as 55, 77, 100 etc.
/// avclevel: AVC IDC level number such as 10, 11, 20, 21 etc.
/// aacaot: AAC audio object type; 0, 1 or 2 are supported.
/// videoframerate: Frame rate of the video in this MP4.
/// seekpoints: Array that lists the available keyframes in a file as time stamps in milliseconds.
/// This is optional as the MP4 file might not contain this information. Generally speaking,
/// most MP4 files will include this by default.
/// videocodecid: Usually a string such as "avc1" or "VP6F."
/// audiocodecid: Usually a string such as ".mp3" or "mp4a."
/// progressivedownloadinfo: Object that provides information from the "pdin" atom. This is optional
/// and many files will not have this field.
/// trackinfo: Object that provides information on all the tracks in the MP4 file, including their sample description ID.
/// tags: Array of key value pairs representing the information present in the "ilst" atom, which is
/// the equivalent of ID3 tags for MP4 files. These tags are mostly used by iTunes.
/// </para>
/// </summary>
/// <returns>Metadata event tag.</returns>
ITag CreateFileMeta()
{
#if !SILVERLIGHT
log.Debug("Creating onMetaData");
#endif
// Create tag for onMetaData event
ByteBuffer buf = ByteBuffer.Allocate(1024);
buf.AutoExpand = true;
AMFWriter output = new AMFWriter(buf);
output.WriteString("onMetaData");
Dictionary<string, object> props = new Dictionary<string, object>();
// Duration property
props.Add("duration", ((double)_duration / (double)_timeScale));
props.Add("width", _width);
props.Add("height", _height);
// Video codec id
props.Add("videocodecid", _videoCodecId);
props.Add("avcprofile", _avcProfile);
props.Add("avclevel", _avcLevel);
props.Add("videoframerate", _fps);
// Audio codec id - watch for mp3 instead of aac
props.Add("audiocodecid", _audioCodecId);
props.Add("aacaot", _audioCodecType);
props.Add("audiosamplerate", _audioTimeScale);
props.Add("audiochannels", _audioChannels);
props.Add("moovposition", _moovOffset);
//props.put("chapters", ""); //this is for f4b - books
if (_seekPoints != null)
{
props.Add("seekpoints", _seekPoints);
}
//tags will only appear if there is an "ilst" atom in the file
//props.put("tags", "");
List<Dictionary<String, Object>> arr = new List<Dictionary<String, Object>>(2);
if (_hasAudio)
{
Dictionary<String, Object> audioMap = new Dictionary<String, Object>(4);
audioMap.Add("timescale", _audioTimeScale);
audioMap.Add("language", "und");
List<Dictionary<String, String>> desc = new List<Dictionary<String, String>>(1);
audioMap.Add("sampledescription", desc);
Dictionary<String, String> sampleMap = new Dictionary<String, String>(1);
sampleMap.Add("sampletype", _audioCodecId);
desc.Add(sampleMap);
if (_audioSamples != null)
{
audioMap.Add("length_property", _audioSampleDuration * _audioSamples.Count);
//release some memory, since we're done with the vectors
_audioSamples.Clear();
_audioSamples = null;
}
arr.Add(audioMap);
}
if (_hasVideo)
{
Dictionary<String, Object> videoMap = new Dictionary<String, Object>(3);
videoMap.Add("timescale", _videoTimeScale);
videoMap.Add("language", "und");
List<Dictionary<String, String>> desc = new List<Dictionary<String, String>>(1);
videoMap.Add("sampledescription", desc);
Dictionary<String, String> sampleMap = new Dictionary<String, String>(1);
sampleMap.Add("sampletype", _videoCodecId);
desc.Add(sampleMap);
if (_videoSamples != null)
{
videoMap.Add("length_property", _videoSampleDuration * _videoSamples.Count);
//release some memory, since we're done with the vectors
_videoSamples.Clear();
_videoSamples = null;
}
arr.Add(videoMap);
}
props.Add("trackinfo", arr.ToArray());
//set this based on existence of seekpoints
props.Add("canSeekToEnd", (_seekPoints != null));
output.WriteAssociativeArray(ObjectEncoding.AMF0, props);
buf.Flip();
//now that all the meta properties are done, update the duration
_duration = (long)Math.Round(_duration * 1000d);
ITag result = new Tag(IOConstants.TYPE_METADATA, 0, buf.Limit, buf.ToArray(), 0);
return result;
}
/// <summary>
/// Write "onMetaData" tag to the file.
/// </summary>
/// <param name="duration">Duration to write in milliseconds.</param>
/// <param name="videoCodecId">Id of the video codec used while recording.</param>
/// <param name="audioCodecId">Id of the audio codec used while recording.</param>
private void WriteMetadataTag(double duration, object videoCodecId, object audioCodecId)
{
_metaPosition = _writer.BaseStream.Position;
MemoryStream ms = new MemoryStream();
AMFWriter output = new AMFWriter(ms);
output.WriteString("onMetaData");
Dictionary<string, object> props = new Dictionary<string, object>();
props.Add("duration", _duration);
if (videoCodecId != null)
{
props.Add("videocodecid", videoCodecId);
}
if (audioCodecId != null)
{
props.Add("audiocodecid", audioCodecId);
}
props.Add("canSeekToEnd", true);
output.WriteAssociativeArray(ObjectEncoding.AMF0, props);
byte[] buffer = ms.ToArray();
if (_fileMetaSize == 0)
{
_fileMetaSize = buffer.Length;
}
ITag onMetaData = new Tag(IOConstants.TYPE_METADATA, 0, buffer.Length, buffer, 0);
WriteTag(onMetaData);
}
/// <summary>
/// Create tag for metadata event.
/// </summary>
/// <returns></returns>
private ITag CreateFileMeta()
{
// Create tag for onMetaData event
ByteBuffer buf = ByteBuffer.Allocate(1024);
buf.AutoExpand = true;
AMFWriter output = new AMFWriter(buf);
// Duration property
output.WriteString("onMetaData");
Dictionary<string, object> props = new Dictionary<string,object>();
props.Add("duration", _duration / 1000.0);
if (_firstVideoTag != -1)
{
long old = GetCurrentPosition();
SetCurrentPosition(_firstVideoTag);
ReadTagHeader();
byte frametype = _reader.ReadByte();
// Video codec id
props.Add("videocodecid", frametype & IOConstants.MASK_VIDEO_CODEC);
SetCurrentPosition(old);
}
if (_firstAudioTag != -1)
{
long old = GetCurrentPosition();
SetCurrentPosition(_firstAudioTag);
ReadTagHeader();
byte frametype = _reader.ReadByte();
// Audio codec id
props.Add("audiocodecid", (frametype & IOConstants.MASK_SOUND_FORMAT) >> 4);
SetCurrentPosition(old);
}
props.Add("canSeekToEnd", true);
output.WriteAssociativeArray(ObjectEncoding.AMF0, props);
buf.Flip();
ITag result = new Tag(IOConstants.TYPE_METADATA, 0, buf.Limit, buf.ToArray(), 0);
return result;
}
/// <summary>
/// Create tag for metadata event.
/// </summary>
/// <returns></returns>
ITag CreateFileMeta()
{
log.Debug("Creating onMetaData");
// Create tag for onMetaData event
ByteBuffer buf = ByteBuffer.Allocate(1024);
buf.AutoExpand = true;
AMFWriter output = new AMFWriter(buf);
output.WriteString("onMetaData");
Hashtable props = new Hashtable();
// Duration property
props.Add("duration", ((double)_duration / (double)_timeScale));
// Audio codec id - watch for mp3 instead of aac
props.Add("audiocodecid", _audioCodecId);
props.Add("aacaot", _audioCodecType);
props.Add("audiosamplerate", _audioTimeScale);
props.Add("audiochannels", _audioChannels);
props.Add("moovposition", _moovOffset);
//tags will only appear if there is an "ilst" atom in the file
//props.put("tags", "");
props.Add("canSeekToEnd", false);
output.WriteAssociativeArray(ObjectEncoding.AMF0, props);
buf.Flip();
//now that all the meta properties are done, update the duration
_duration = (long)Math.Round(_duration * 1000d);
ITag result = new Tag(IOConstants.TYPE_METADATA, 0, buf.Limit, buf.ToArray(), 0);
return result;
}
/// <summary>
/// Tag sequence
/// MetaData, Audio config, remaining audio
///
/// Packet prefixes:
/// af 00 ... 06 = Audio extra data (first audio packet)
/// af 01 = Audio frame
///
/// Audio extra data(s):
/// af 00 = Prefix
/// 11 90 4f 14 = AAC Main = aottype 0
/// 12 10 = AAC LC = aottype 1
/// 13 90 56 e5 a5 48 00 = HE-AAC SBR = aottype 2
/// 06 = Suffix
///
/// Still not absolutely certain about this order or the bytes - need to verify later
/// </summary>
private void CreatePreStreamingTags()
{
log.Debug("Creating pre-streaming tags");
ByteBuffer body = ByteBuffer.Allocate(41);
body.AutoExpand = true;
body.Put(new byte[] { (byte)0xaf, (byte)0 }); //prefix
if (_audioDecoderBytes != null)
{
body.Put(_audioDecoderBytes);
}
else
{
//default to aac-lc when the esds doesnt contain descripter bytes
body.Put(Mp4Reader.AUDIO_CONFIG_FRAME_AAC_LC);
}
body.Put((byte)0x06); //suffix
ITag tag = new Tag(IOConstants.TYPE_AUDIO, 0, (int)body.Length, body.ToArray(), _prevFrameSize);
//add tag
_firstTags.AddLast(tag);
}
public ITag ReadTag()
{
lock (this.SyncRoot)
{
ITag tag = null;
//empty-out the pre-streaming tags first
if (_firstTags.Count > 0)
{
//log.debug("Returning pre-tag");
// Return first tags before media data
tag = _firstTags.First.Value;
_firstTags.RemoveFirst();
return tag;
}
//log.debug("Read tag - sample {} prevFrameSize {} audio: {} video: {}", new Object[]{currentSample, prevFrameSize, audioCount, videoCount});
//get the current frame
Mp4Frame frame = _frames[_currentFrame];
log.Debug(string.Format("Playback #{0} {1}", _currentFrame, frame));
int sampleSize = frame.Size;
int time = (int)Math.Round(frame.Time * 1000.0);
//log.debug("Read tag - dst: {} base: {} time: {}", new Object[]{frameTs, baseTs, time});
long samplePos = frame.Offset;
//log.debug("Read tag - samplePos {}", samplePos);
//determine frame type and packet body padding
byte type = frame.Type;
//create a byte buffer of the size of the sample
byte[] data = new byte[sampleSize + 2];
try
{
Array.Copy(Mp4Reader.PREFIX_AUDIO_FRAME, data, Mp4Reader.PREFIX_AUDIO_FRAME.Length);
//do we need to add the mdat offset to the sample position?
_fs.Position = samplePos;
_fs.Read(data, Mp4Reader.PREFIX_AUDIO_FRAME.Length, sampleSize);
}
catch (Exception ex)
{
log.Error("Error on channel position / read", ex);
}
//create the tag
tag = new Tag(type, time, data.Length, data, _prevFrameSize);
//increment the frame number
_currentFrame++;
//set the frame / tag size
_prevFrameSize = tag.BodySize;
//log.debug("Tag: {}", tag);
return tag;
}
}
