[FFmpeg-devel] [PATCH] avformat/flacdec: support fast-seek

[Ching-Yi Chan]

I found the generic seek will invoke the flac_read_timestamp function.
It read exta packet will slow down the seek time
https://github.com/FFmpeg/FFmpeg/blob/master/libavformat/flacdec.c#L224



2015-09-24 17:27 GMT+08:00 Ching-Yi Chan <chingyichan.tw at gmail.com>:

> Hi Hendrik,
>
> I move the index data into AVStream, but seeking is slow. (it try to
> download many data).
> Is there something wrong ?
>
> 2015-09-24 16:09 GMT+08:00 Hendrik Leppkes <h.leppkes at gmail.com>:
>
>> On Thu, Sep 24, 2015 at 9:08 AM, Ching-Yi Chan <chingyichan.tw at gmail.com>
>> wrote:
>> > flacdec is not supported fast-seek yet.
>> >
>> > changes:
>> >
>> > 1. parse the seekpoint from metadata block
>> > 2. add seek callback to look up seek position
>> >
>>
>> You should store the index in the AVStream index_entries field, that
>> way you don't need to duplicate the structure in the private flac
>> context, and the generic seeking code can make use of them without you
>> needing a specialized seekign function.
>>
>> - Hendrik
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>
>