<div dir="ltr">Martijn,<div><br></div><div style>I don't use any metadata when encoding and decoding. When I call </div><div style><br></div><div style><b>FLAC__StreamDecoderStateString[FLAC__stream_decoder_get_state(m_decoder)] </b><br>
</div><div style><b><br></b></div><div style>it returns </div><div style><br></div><div style>FLAC__STREAM_DECODER_SEARCH_FOR_METADATA<br></div><div style><br></div><div style>enum value. Is it an error ?</div></div><div class="gmail_extra">
<br><br><div class="gmail_quote">2013/7/2 Burak Orçun Özkablan <span dir="ltr"><<a href="mailto:borcunozkablan@gmail.com" target="_blank">borcunozkablan@gmail.com</a>></span><br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="ltr">Hi again,<div><br></div><div>I can not solve problem. I want to mention my source code, so you may answer easily.</div><div><br></div><div>This is decoder init stream function.</div><div>
<br></div><div><b>FLAC__stream_decoder_init_stream(m_decoder, decoderReadCallback, NULL, NULL, NULL, NULL, decoderWriteCallback, NULL, decoderErrorCallback, input_pile_array);</b><br></div><div><b><br></b></div>
<div>Then, callbacks</div><div><b><br></b></div><div><div style="font-weight:bold">/// \brief read callback function of decoder</div><div style="font-weight:bold">FLAC__StreamDecoderReadStatus decoderReadCallback(const FLAC__StreamDecoder *decoder, </div>
<div style="font-weight:bold"><span style="white-space:pre-wrap"> </span> FLAC__byte buffer[], </div><div style="font-weight:bold"><span style="white-space:pre-wrap"> </span> size_t *bytes, </div>
<div style="font-weight:bold"><span style="white-space:pre-wrap"> </span> void *callback_param</div><div style="font-weight:bold">);</div><div style="font-weight:bold"><br></div><div style="font-weight:bold">
/// \brief write callback function of decoder</div><div style="font-weight:bold">FLAC__StreamDecoderWriteStatus decoderWriteCallback(const FLAC__StreamDecoder *decoder, </div><div style="font-weight:bold"><span style="white-space:pre-wrap"> </span>const FLAC__Frame *frame, </div>
<div style="font-weight:bold"><span style="white-space:pre-wrap"> </span>const FLAC__int32 * const buffer[], </div><div style="font-weight:bold"><span style="white-space:pre-wrap"> </span>void *callback_param</div>
<div style="font-weight:bold">);</div><div style="font-weight:bold"><br></div><div style="font-weight:bold">/// \brief error callback function of decoder</div><div style="font-weight:bold">void decoderErrorCallback(const FLAC__StreamDecoder *decoder, </div>
<div style="font-weight:bold"><span style="white-space:pre-wrap"> </span> FLAC__StreamDecoderErrorStatus status, </div><div style="font-weight:bold"><span style="white-space:pre-wrap"> </span> void *callback_param</div>
<div style="font-weight:bold">);</div><div style="font-weight:bold"><br></div><div>When I call following statement, </div><div><br></div><div><div><b>// decode data</b></div><div><b>if(!FLAC__stream_decoder_process_single(m_decoder))</b></div>
<div><b><span style="white-space:pre-wrap"> </span>return;</b></div><div><b><br></b></div><div>firstly, read callback is called. In read callback function, I just use memory copy process.</div><div><div><br>
</div><div><b>// copy buffer array to m_pile_array</b></div><div><b>if(input_pile_size > 0) {</b></div><div><b><span style="white-space:pre-wrap"> </span>memcpy(input_pile_array, buffer, input_pile_size);</b></div>
<div><b><span style="white-space:pre-wrap"> </span>input_pile_size = 0;</b></div><div><b><br></b></div><div><b><br></b></div><div><b><span style="white-space:pre-wrap"> </span>return FLAC__STREAM_DECODER_READ_STATUS_CONTINUE;</b></div>
<div><b>}</b></div><div><b><br></b></div><div><b>return FLAC__STREAM_DECODER_READ_STATUS_ABORT;</b></div><div><b><br></b></div><div>and I wait for calling write callback but program throws LOST_SYNC exception. I don't know what causes.</div>
</div></div></div></div><div class="HOEnZb"><div class="h5"><div class="gmail_extra"><br><br><div class="gmail_quote">2013/7/1 Burak Orçun Özkablan <span dir="ltr"><<a href="mailto:borcunozkablan@gmail.com" target="_blank">borcunozkablan@gmail.com</a>></span><br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Sorry, I am newbie.<div><br></div><div>Sample codes are from <a href="https://github.com/oneman/libflac/tree/master/examples/cpp" target="_blank">https://github.com/oneman/libflac/tree/master/examples/cpp</a>.</div>
<div>
I used <span style="font-size:13px;font-family:arial,sans-serif">FLAC__stream_decoder_process_</span><span style="font-size:13px;font-family:arial,sans-serif">single function but it still gives exception. Maybe I could not control read callback, you're right.</span></div>
<div><span style="font-size:13px;font-family:arial,sans-serif">I will check it and write result in this thread.</span></div><div><span style="font-size:13px;font-family:arial,sans-serif"><br></span></div><div>
<span style="font-size:13px;font-family:arial,sans-serif">Thanks for help.</span></div></div><div><div><div class="gmail_extra"><br><br><div class="gmail_quote">2013/7/1 Martijn van Beurden <span dir="ltr"><<a href="mailto:mvanb1@gmail.com" target="_blank">mvanb1@gmail.com</a>></span><br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div bgcolor="#FFFFFF" text="#000000">
<div>I'll top-post this one because it
wasn't sent to the mailinglist but to me. Please reply to list
next time.<br>
<br>
I assume you mean the main.c files in the encode and decode
directory under examples. I can't really determine the root cause
of your problem with this information, but I think you're trying
to feed the decoder blocks that are incomplete. The LOST SYNC
error is usually seen with corrupted blocks, so I think the blocks
are incomplete or, less likely, corrupt.<br>
<br>
There are a few ways to counter this. The easy way is to add a
little latency to be sure at least one complete block is in the
receiving buffer. So, only call
FLAC__stream_decoder_process_single() if the buffer is filled with
enough data. If you want the lowest latency possible you could
force a small block size or let the encoding PC signal the
decoding PC when a block is finished, so the decoding process can
be sure there is a full block in the buffer.<br>
<br>
Oh, and you might take a look at the reading callback, maybe that
one is overreading the buffer?<br>
<br>
I hope that helps.<div><div><br>
<br>
On 01-07-13 17:51, Burak Orçun Özkablan wrote:<br>
</div></div></div><div><div>
<blockquote type="cite">
<div dir="ltr">Martijn,
<div><br>
</div>
<div>I encode a one second captured audio data in my PC
and send it to other PC as encoded. This is OK.</div>
<div>I want to decode data in other PC and play it but
when I am decoding data with decoder stream function,
exception throws.</div>
</div>
<div class="gmail_extra"><br>
<br>
<div class="gmail_quote">2013/7/1 Burak Orçun Özkablan <span dir="ltr"><<a href="mailto:borcunozkablan@gmail.com" target="_blank">borcunozkablan@gmail.com</a>></span><br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="ltr">Yes, I mean sample codes in FLAC directory.
These samples (encode.c and decode.c) are about
encode/decode with file (using
FLAC__stream_encoder_init_file and
FLAC__stream_decoder_init_file functions).
<div>
Streaming which I used is audio data transfer over UDP
or TCP sockets of boost library. </div>
<div><br>
</div>
<div>I send 1 packet which contains 1 second "raw" audio
data and header information as unsigned char array. In
the other PC, I play it. I must do it continuously, so I
said 'streaming' for this.</div>
<div>I can stream without FLAC library but I have to do
with any codec library because our network bandwidth is
low so I dont want overhead problem and latency.</div>
<div><br>
</div>
<div>For streaming, FLAC suggests streaming functions such
as FLAC__stream_encoder_init_stream,
FLAC__stream_decoder_init_stream. The decoder stream
function takes 3 callback functions, write, read and
error.</div>
<div>What I understand from LOST SYNC exception is write
and read callback must runs sync. I can not success it,
code runs only reading callbacks and throws LOST_SYNC
exception.</div>
</div>
<div class="gmail_extra">
<div>
<div>
<br>
<br>
<div class="gmail_quote">2013/7/1 Martijn van Beurden
<span dir="ltr"><<a href="mailto:mvanb1@gmail.com" target="_blank">mvanb1@gmail.com</a>></span><br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
On 01-07-13 16:48, Burak Orçun Özkablan wrote:<br>
> [...]<br>
<div>><br>
> I run your sample codes, encode.c and
decode.c, about file encode /<br>
> decode. Then, I run<br>
> streaming encode / decode with two
different source codes but when I<br>
> use streaming encode / decode over network
in real-time, code throws<br>
> LOST_SYNC exception and only reading
callback runs not writing<br>
> callback after exception.<br>
<br>
</div>
I'm not sure I understand what you mean. You are
talking about file<br>
encode and decode ans streaming encode and decode,
do you mean the files<br>
in the FLAC source directory example? If so, what
is the difference,<br>
because I only see file encoding examples?<br>
<br>
Furthermore, I wonder what you mean by stream. Are
you serving a file<br>
that is being encoded over HTTP, S(a)MB(a), NFS or
something specially<br>
designed for streaming, like MMS? So, how are you
streaming the FLAC file?<br>
<div><br>
> How can I solve sync problem over network?
Is it possible over network<br>
> or does FLAC stream with file?<br>
<br>
</div>
FLAC is capable of streaming, so it should be
possible to fix this I guess.<br>
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