[FFmpeg-devel] More specific error codes

[Andrey Utkin]

At last I got back to this issue.
First I thought of adding such new error codes:

#define AVERROR_BAD_REQUEST        FFERRTAG(0xF8,'4','0','0') ///<
Remote server returns 400 Bad Request reply
#define AVERROR_AUTH_FAILED        FFERRTAG(0xF8,'4','0','1') ///<
Unauthorized by remote server
#define AVERROR_ACCESS_DENIED      FFERRTAG(0xF8,'4','0','3') ///<
Forbidden, access denied etc.
#define AVERROR_RESOURCE_NOT_FOUND FFERRTAG(0xF8,'4','0','4') ///<
Media resource not found
#define AVERROR_OTHER_4XX          FFERRTAG(0xF8,'4','X','X') ///<
Generic error value for other 4xx replies
#define AVERROR_SERVER_ERROR       FFERRTAB(0xF8,'5','X','X') ///<
Internal error on server (remote site), 5xx error

Then i had an idea that
AVERROR(EACCES) could replace AVERROR_ACCESS_DENIED, and
AVERROR(ENOENT) could replace AVERROR_RESOURCE_NOT_FOUND. The downside
of such way is inconsistence of representation of HTTP/RTSP status
codes sets.

What do you think about it? Which would you prefer?

-- 
Andrey Utkin