Hi,
I am using the JitterBuffer. Since there is not so much documentation I
think I dont use it in a correct way. All the packets are recieved (I
control the sequence numbers) but the JitterBuffer often tells me he has
no packet. I am using it in the following way:
I am not sure if I use the ticks correctly but I think it can be set to
20(msec).
It is set as a Member in my class and i pointed out where i use it so it
is clear if i use it somewhere i better shouldnt.
- I initialize the JitterBuffer with ticks = 20 (saved in the variable
m_Ticks)
- My network thread repeadedly (every 20msec) calls AddPacket() which
adds the packet to the buffer
320 bytes of audio data are set as the data
the timestamp is set to the sequence number of the packet
times 20 (m_Ticks)
the span of the packet is set to 20 (the packet covers one
tick entirely)
- A thread which plays my Audio calls every 20msec the function GetSound()
As I said before the buffer just returns more or less the halve of the
packets. But all the packets are added to the JitterBuffer.
I posted some of the code i use in my email and i would be really
thankfull if anybody could tell me where i am using the JitterBuffer wrong.
Many thanks in advance
David Feurle
Init()
{
m_JitterBuffer = jitter_buffer_init(m_Ticks);
jitter_buffer_reset(m_JitterBuffer);
}
Exit()
{
jitter_buffer_destroy(m_JitterBuffer);
}
void BeatJitterBuffer::AddPacket(Packet* packet)
{
m_Mutex.Aquire();
char buff[320];
JitterBufferPacket p;
m_Decoder->DecompressPacket(packet, buff, 320);
p.data = buff;
p.len = 320;
p.timestamp = packet->SequenceNumber() * m_Ticks;
p.span = m_Ticks;
jitter_buffer_put(m_JitterBuffer, &p);
}
m_Mutex.Release();
delete packet;
}
void BeatJitterBuffer::GetSound(char* buffer, size_t maxLength)
{
int ret;
if (320 == maxLength)
{
JitterBufferPacket packet;
packet.data = buffer;
m_Mutex.Aquire();
ret = jitter_buffer_get(m_JitterBuffer, &packet, 0);
if(ret != JITTER_BUFFER_OK)
{
ZeroMemory(packet.data, maxLength);
}
jitter_buffer_tick(m_JitterBuffer);
jitter_buffer_update_delay(m_JitterBuffer, &packet, NULL);
m_Mutex.Release();
}
else
{
ZeroMemory(buffer, maxLength);
}
}
(Sorry about the delay -- currently attending ICASSP) Hi, Haven't looked at all the details, but what's clearly wrong is that you need to put the *compressed* packets in the jitter buffer and decode them only when you _get() them. Jean-Marc David Feurle wrote:> Hi, > > I am using the JitterBuffer. Since there is not so much documentation I > think I dont use it in a correct way. All the packets are recieved (I > control the sequence numbers) but the JitterBuffer often tells me he has > no packet. I am using it in the following way: > > I am not sure if I use the ticks correctly but I think it can be set to > 20(msec). > It is set as a Member in my class and i pointed out where i use it so it > is clear if i use it somewhere i better shouldnt. > > - I initialize the JitterBuffer with ticks = 20 (saved in the variable > m_Ticks) > - My network thread repeadedly (every 20msec) calls AddPacket() which > adds the packet to the buffer > 320 bytes of audio data are set as the data > the timestamp is set to the sequence number of the packet times > 20 (m_Ticks) > the span of the packet is set to 20 (the packet covers one tick > entirely) > - A thread which plays my Audio calls every 20msec the function GetSound() > > As I said before the buffer just returns more or less the halve of the > packets. But all the packets are added to the JitterBuffer. > I posted some of the code i use in my email and i would be really > thankfull if anybody could tell me where i am using the JitterBuffer wrong. > > Many thanks in advance > > David Feurle > > > > Init() > { > m_JitterBuffer = jitter_buffer_init(m_Ticks); > jitter_buffer_reset(m_JitterBuffer); > } > > Exit() > { > jitter_buffer_destroy(m_JitterBuffer); > } > > void BeatJitterBuffer::AddPacket(Packet* packet) > { > m_Mutex.Aquire(); > char buff[320]; > JitterBufferPacket p; > m_Decoder->DecompressPacket(packet, buff, 320); > p.data = buff; > p.len = 320; > p.timestamp = packet->SequenceNumber() * m_Ticks; > p.span = m_Ticks; > jitter_buffer_put(m_JitterBuffer, &p); > } > > m_Mutex.Release(); > delete packet; > } > > void BeatJitterBuffer::GetSound(char* buffer, size_t maxLength) > { > int ret; > > if (320 == maxLength) > { > JitterBufferPacket packet; > packet.data = buffer; > > m_Mutex.Aquire(); > > ret = jitter_buffer_get(m_JitterBuffer, &packet, 0); > > if(ret != JITTER_BUFFER_OK) > { > ZeroMemory(packet.data, maxLength); > } > > jitter_buffer_tick(m_JitterBuffer); > jitter_buffer_update_delay(m_JitterBuffer, &packet, NULL); > m_Mutex.Release(); > } > else > { > ZeroMemory(buffer, maxLength); > } > } > > _______________________________________________ > Speex-dev mailing list > Speex-dev@xiph.org > http://lists.xiph.org/mailman/listinfo/speex-dev >
Some more info I forgott to mention: I tested with the JitterBuffer from the Beta 1.2.1 as well as with the one from the svn Head. Thanks in advance! David> (Sorry about the delay -- currently attending ICASSP) > Hi, > > Haven't looked at all the details, but what's clearly wrong is that you > need to put the *compressed* packets in the jitter buffer and decode > them only when you _get() them. > > Jean-Marc > > David Feurle wrote: > >> Hi, >> >> I am using the JitterBuffer. Since there is not so much documentation I >> think I dont use it in a correct way. All the packets are recieved (I >> control the sequence numbers) but the JitterBuffer often tells me he has >> no packet. I am using it in the following way: >> >> I am not sure if I use the ticks correctly but I think it can be set to >> 20(msec). >> It is set as a Member in my class and i pointed out where i use it so it >> is clear if i use it somewhere i better shouldnt. >> >> - I initialize the JitterBuffer with ticks = 20 (saved in the variable >> m_Ticks) >> - My network thread repeadedly (every 20msec) calls AddPacket() which >> adds the packet to the buffer >> 320 bytes of audio data are set as the data >> the timestamp is set to the sequence number of the packet times >> 20 (m_Ticks) >> the span of the packet is set to 20 (the packet covers one tick >> entirely) >> - A thread which plays my Audio calls every 20msec the function GetSound() >> >> As I said before the buffer just returns more or less the halve of the >> packets. But all the packets are added to the JitterBuffer. >> I posted some of the code i use in my email and i would be really >> thankfull if anybody could tell me where i am using the JitterBuffer wrong. >> >> Many thanks in advance >> >> David Feurle >> >> >> >> Init() >> { >> m_JitterBuffer = jitter_buffer_init(m_Ticks); >> jitter_buffer_reset(m_JitterBuffer); >> } >> >> Exit() >> { >> jitter_buffer_destroy(m_JitterBuffer); >> } >> >> void BeatJitterBuffer::AddPacket(Packet* packet) >> { >> m_Mutex.Aquire(); >> char buff[320]; >> JitterBufferPacket p; >> m_Decoder->DecompressPacket(packet, buff, 320); >> p.data = buff; >> p.len = 320; >> p.timestamp = packet->SequenceNumber() * m_Ticks; >> p.span = m_Ticks; >> jitter_buffer_put(m_JitterBuffer, &p); >> } >> >> m_Mutex.Release(); >> delete packet; >> } >> >> void BeatJitterBuffer::GetSound(char* buffer, size_t maxLength) >> { >> int ret; >> >> if (320 == maxLength) >> { >> JitterBufferPacket packet; >> packet.data = buffer; >> >> m_Mutex.Aquire(); >> >> ret = jitter_buffer_get(m_JitterBuffer, &packet, 0); >> >> if(ret != JITTER_BUFFER_OK) >> { >> ZeroMemory(packet.data, maxLength); >> } >> >> jitter_buffer_tick(m_JitterBuffer); >> jitter_buffer_update_delay(m_JitterBuffer, &packet, NULL); >> m_Mutex.Release(); >> } >> else >> { >> ZeroMemory(buffer, maxLength); >> } >> } >> >> _______________________________________________ >> Speex-dev mailing list >> Speex-dev@xiph.org >> http://lists.xiph.org/mailman/listinfo/speex-dev >> >>
Thanks for your reply Jean-Marc!
this was what I had before.
But I decided to restructure it since the thread that plays the sound is
a callback from the sound hardware, more or less an interrupt handler.
For me it seems more reasonable to waste some memory for to save the
decompressed Packet. While I write this I begin to think that it is
possible I decompress Packets that are never used because they are too
late. What is the reason why one should put the compressed Packet in the
JitterBuffer?
David> (Sorry about the delay -- currently attending ICASSP)
> Hi,
>
> Haven't looked at all the details, but what's clearly wrong is that
you
> need to put the *compressed* packets in the jitter buffer and decode
> them only when you _get() them.
>
> Jean-Marc
>
> David Feurle wrote:
>
>> Hi,
>>
>> I am using the JitterBuffer. Since there is not so much documentation I
>> think I dont use it in a correct way. All the packets are recieved (I
>> control the sequence numbers) but the JitterBuffer often tells me he
has
>> no packet. I am using it in the following way:
>>
>> I am not sure if I use the ticks correctly but I think it can be set to
>> 20(msec).
>> It is set as a Member in my class and i pointed out where i use it so
it
>> is clear if i use it somewhere i better shouldnt.
>>
>> - I initialize the JitterBuffer with ticks = 20 (saved in the variable
>> m_Ticks)
>> - My network thread repeadedly (every 20msec) calls AddPacket() which
>> adds the packet to the buffer
>> 320 bytes of audio data are set as the data
>> the timestamp is set to the sequence number of the packet
times
>> 20 (m_Ticks)
>> the span of the packet is set to 20 (the packet covers one
tick
>> entirely)
>> - A thread which plays my Audio calls every 20msec the function
GetSound()
>>
>> As I said before the buffer just returns more or less the halve of the
>> packets. But all the packets are added to the JitterBuffer.
>> I posted some of the code i use in my email and i would be really
>> thankfull if anybody could tell me where i am using the JitterBuffer
wrong.
>>
>> Many thanks in advance
>>
>> David Feurle
>>
>>
>>
>> Init()
>> {
>> m_JitterBuffer = jitter_buffer_init(m_Ticks);
>> jitter_buffer_reset(m_JitterBuffer);
>> }
>>
>> Exit()
>> {
>> jitter_buffer_destroy(m_JitterBuffer);
>> }
>>
>> void BeatJitterBuffer::AddPacket(Packet* packet)
>> {
>> m_Mutex.Aquire();
>> char buff[320];
>> JitterBufferPacket p;
>> m_Decoder->DecompressPacket(packet, buff, 320);
>> p.data = buff;
>> p.len = 320;
>> p.timestamp = packet->SequenceNumber() * m_Ticks;
>> p.span = m_Ticks;
>> jitter_buffer_put(m_JitterBuffer, &p);
>> }
>>
>> m_Mutex.Release();
>> delete packet;
>> }
>>
>> void BeatJitterBuffer::GetSound(char* buffer, size_t maxLength)
>> {
>> int ret;
>>
>> if (320 == maxLength)
>> {
>> JitterBufferPacket packet;
>> packet.data = buffer;
>>
>> m_Mutex.Aquire();
>>
>> ret = jitter_buffer_get(m_JitterBuffer, &packet, 0);
>>
>> if(ret != JITTER_BUFFER_OK)
>> {
>> ZeroMemory(packet.data, maxLength);
>> }
>>
>> jitter_buffer_tick(m_JitterBuffer);
>> jitter_buffer_update_delay(m_JitterBuffer, &packet, NULL);
>> m_Mutex.Release();
>> }
>> else
>> {
>> ZeroMemory(buffer, maxLength);
>> }
>> }
>>
>> _______________________________________________
>> Speex-dev mailing list
>> Speex-dev@xiph.org
>> http://lists.xiph.org/mailman/listinfo/speex-dev
>>
>>
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