Hello... I have implemented the libavcodec library to inspect buffered data
from a stream and determine the contents using my own read function. After
determining the format context, I am able to decode the contents of the stream
using the same read routine that is subsequently invoked by the av_read_frame
function. The code is packaged up nicely in a reusable DLL.
When I instantiate a second instance of the DLL in the same process, I come
into problems. It appears the libavcodec library uses my same read routine in
both cases and the second instance never gets past the call to
av_open_input_stream. Instead, my read routine is invoked during that call
where in the first instance of the DLL, the read routine is not invoked until
after the av_find_stream_info call as more data is needed to finish determining
the format context.
Is there a way to let the library know that this is a different stream of data
and that it should be handled as such?
I've included some sample code of the implementation...
The following buffer only contains some of the data, the rest is read in from
my read routine passed to init_put_byte.
BYTE pDataBuffer[2048];
long lSize = 2048;
AVProbeData pd;
pd.buf = pDataBuffer;
pd.buf_size = lSize;
pd.filename = "";
AVInputFormat* pAVInputFormat = av_probe_input_format(&pd, 1);
if(!pAVInputFormat)
{
return false;
}
pAVInputFormat->flags |= AVFMT_NOFILE;
ByteIOContext ByteIOCtx;
if(init_put_byte(&ByteIOCtx, pDataBuffer, lSize, 0, this, MyReadFunction, NULL,
NULL) < 0)
{
return false;
}
AVFormatContext* pFormatCtx;
if(av_open_input_stream(&pFormatCtx, &ByteIOCtx, "", pAVInputFormat, NULL) < 0)
{
return false;
}
if(av_find_stream_info(pFormatCtx) < 0)
{
return false;
}
The following code later uses my same read function to process the buffer...
AVPacket packet;
if(av_read_frame(pFormatCtx, &packet) < 0)
{
return false;
}
Do I really need to implement my own URL as seen in other sample code? Is there
some context data that can be passed with one of the above function calls to
signal a different data stream is being processed?
Thanks Greatly
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