[FFmpeg-devel] [PATCH] Speex parser

Justin Ruggles justin.ruggles
Mon Aug 31 03:26:39 CEST 2009

Baptiste Coudurier wrote:

> On 8/30/2009 5:50 PM, Justin Ruggles wrote:
>> Justin Ruggles wrote:
>>> Justin Ruggles wrote:
>>>> Michael Niedermayer wrote:
>>>>> On Sun, Aug 30, 2009 at 10:40:45AM -0400, Justin Ruggles wrote:
>>>>>> Hi,
>>>>>> Here is a Speex parser.  It does not split any frames, but only analyzes
>>>>>> them in order to set the proper AVCodecContext parameters.
>>>>> the decoder can do this, av_find_stream_info() should already create a
>>>>> decoder to fill these in when they are missing.
>>>> Why should it have to rely on the decoder...especially since we do not
>>>> have a native decoder?  So that one MUST compile in an external library
>>>> for stream copy to work properly.
>>> If there is no problem with packet duration being 0 or wrong, then I
>>> think stream copy could work without the parser or decoder.  I tried flv
>>> to ogg and it seemed to work since timestamps were just copied from one
>>> container to the other.  Packet duration was still wrong though, and I
>>> don't know if that causes other problems.
>> Ok, I think I figured out the solution to this part at least.  Speex
>> needs to be added to the list of codecs in has_codec_parameters() that
>> require frame_size to be non-zero, then the libspeex decoder should not
>> set frame_size at init when it does not have extradata since it could be
>> the wrong value.
> Or finally set sample_fmt to SAMPLE_FMT_NONE triggering decoding of the 
> first frame.

That seems like a hack.  We always know the sample format at decoder
init, but we don't necessarily know the frame size.


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