[FFmpeg-devel] [PATCH] write AC-3 metadata

[Michael Niedermayer]

On Fri, Dec 31, 2010 at 11:57:59AM -0500, Justin Ruggles wrote:
> On 12/30/2010 09:46 PM, Michael Niedermayer wrote:
> 
> > On Wed, Dec 29, 2010 at 05:20:36PM -0500, Justin Ruggles wrote:
> >> Hi,
> >>
> >> On 12/25/2010 03:05 PM, Michael Niedermayer wrote:
> >>
> >>> On Wed, Dec 22, 2010 at 01:26:13PM -0500, Justin Ruggles wrote:
> 
> 
> >>>> +    {"0", "+3.0 dB (1.414)",           0, FF_OPT_TYPE_CONST, 0, INT_MIN, INT_MAX, AC3ENC_PARAM, "ltrtcmixlev"},
> >>>> +    {"1", "+1.5 dB (1.189)",           0, FF_OPT_TYPE_CONST, 1, INT_MIN, INT_MAX, AC3ENC_PARAM, "ltrtcmixlev"},
> >>>> +    {"2", "+0.0 dB (1.000)",           0, FF_OPT_TYPE_CONST, 2, INT_MIN, INT_MAX, AC3ENC_PARAM, "ltrtcmixlev"},
> >>>> +    {"3", "-1.5 dB (0.841)",           0, FF_OPT_TYPE_CONST, 3, INT_MIN, INT_MAX, AC3ENC_PARAM, "ltrtcmixlev"},
> >>>> +    {"4", "-3.0 dB (0.707)",           0, FF_OPT_TYPE_CONST, 4, INT_MIN, INT_MAX, AC3ENC_PARAM, "ltrtcmixlev"},
> >>>> +    {"5", "-4.5 dB (0.595) (default)", 0, FF_OPT_TYPE_CONST, 5, INT_MIN, INT_MAX, AC3ENC_PARAM, "ltrtcmixlev"},
> >>>> +    {"6", "-6.0 dB (0.500)",           0, FF_OPT_TYPE_CONST, 6, INT_MIN, INT_MAX, AC3ENC_PARAM, "ltrtcmixlev"},
> >>>> +    {"7", "-inf dB (0.000)",           0, FF_OPT_TYPE_CONST, 7, INT_MIN, INT_MAX, AC3ENC_PARAM, "ltrtcmixlev"},
> >>>> +{"ltrtsurmixlev", "Lt/Rt Surround Mix Level", offsetof(AC3EncodeContext, options.lt_rt_surround_mix_level), FF_OPT_TYPE_INT, -1, -1, 7, AC3ENC_PARAM, "ltrtsurmixlev"},
> >>>> +    {"3", "-1.5 dB (0.841)",           0, FF_OPT_TYPE_CONST, 3, INT_MIN, INT_MAX, AC3ENC_PARAM, "ltrtsurmixlev"},
> >>>> +    {"4", "-3.0 dB (0.707)",           0, FF_OPT_TYPE_CONST, 4, INT_MIN, INT_MAX, AC3ENC_PARAM, "ltrtsurmixlev"},
> >>>> +    {"5", "-4.5 dB (0.595)",           0, FF_OPT_TYPE_CONST, 5, INT_MIN, INT_MAX, AC3ENC_PARAM, "ltrtsurmixlev"},
> >>>> +    {"6", "-6.0 dB (0.500) (default)", 0, FF_OPT_TYPE_CONST, 6, INT_MIN, INT_MAX, AC3ENC_PARAM, "ltrtsurmixlev"},
> >>>> +    {"7", "-inf dB (0.000)",           0, FF_OPT_TYPE_CONST, 7, INT_MIN, INT_MAX, AC3ENC_PARAM, "ltrtsurmixlev"},
> >>>> +{"lorocmixlev", "Lo/Ro Center Mix Level", offsetof(AC3EncodeContext, options.lo_ro_center_mix_level), FF_OPT_TYPE_INT, -1, -1, 7, AC3ENC_PARAM, "lorocmixlev"},
> >>>> +    {"0", "+3.0 dB (1.414)",           0, FF_OPT_TYPE_CONST, 0, INT_MIN, INT_MAX, AC3ENC_PARAM, "lorocmixlev"},
> >>>> +    {"1", "+1.5 dB (1.189)",           0, FF_OPT_TYPE_CONST, 1, INT_MIN, INT_MAX, AC3ENC_PARAM, "lorocmixlev"},
> >>>> +    {"2", "+0.0 dB (1.000)",           0, FF_OPT_TYPE_CONST, 2, INT_MIN, INT_MAX, AC3ENC_PARAM, "lorocmixlev"},
> >>>> +    {"3", "-1.5 dB (0.841)",           0, FF_OPT_TYPE_CONST, 3, INT_MIN, INT_MAX, AC3ENC_PARAM, "lorocmixlev"},
> >>>> +    {"4", "-3.0 dB (0.707)",           0, FF_OPT_TYPE_CONST, 4, INT_MIN, INT_MAX, AC3ENC_PARAM, "lorocmixlev"},
> >>>> +    {"5", "-4.5 dB (0.595) (default)", 0, FF_OPT_TYPE_CONST, 5, INT_MIN, INT_MAX, AC3ENC_PARAM, "lorocmixlev"},
> >>>> +    {"6", "-6.0 dB (0.500)",           0, FF_OPT_TYPE_CONST, 6, INT_MIN, INT_MAX, AC3ENC_PARAM, "lorocmixlev"},
> >>>> +    {"7", "-inf dB (0.000)",           0, FF_OPT_TYPE_CONST, 7, INT_MIN, INT_MAX, AC3ENC_PARAM, "lorocmixlev"},
> >>>> +{"lorosurmixlev", "Lo/Ro Surround Mix Level", offsetof(AC3EncodeContext, options.lo_ro_surround_mix_level), FF_OPT_TYPE_INT, -1, -1, 7, AC3ENC_PARAM, "lorosurmixlev"},
> >>>> +    {"3", "-1.5 dB (0.841)",           0, FF_OPT_TYPE_CONST, 3, INT_MIN, INT_MAX, AC3ENC_PARAM, "lorosurmixlev"},
> >>>> +    {"4", "-3.0 dB (0.707)",           0, FF_OPT_TYPE_CONST, 4, INT_MIN, INT_MAX, AC3ENC_PARAM, "lorosurmixlev"},
> >>>> +    {"5", "-4.5 dB (0.595)",           0, FF_OPT_TYPE_CONST, 5, INT_MIN, INT_MAX, AC3ENC_PARAM, "lorosurmixlev"},
> >>>> +    {"6", "-6.0 dB (0.500) (default)", 0, FF_OPT_TYPE_CONST, 6, INT_MIN, INT_MAX, AC3ENC_PARAM, "lorosurmixlev"},
> >>>> +    {"7", "-inf dB (0.000)",           0, FF_OPT_TYPE_CONST, 7, INT_MIN, INT_MAX, AC3ENC_PARAM, "lorosurmixlev"},
> >>>
> >>> dont float/double make more sense here?
> >>
> >>
> >> Well, I thought it would be better this way so that the valid option
> >> values could be listed to the user and validated by AVOption.  But if
> >> you prefer floats, I have an alternative implemented that checks the
> >> value against a list of valid values with a tolerance of +/-0.01.  If
> >> the value is not in the list, a warning is printed and a default value
> >> is used instead.  Does that sound like a better option?
> > 
> > with names like lorosurmixlev it doesnt matter ;)
> > noone will ever use it except you and members of the standard comittee ;)
> 
> 
> point taken.  I can change them to use the long names (e.g.
> lo_ro_surround_mix_level).

some documentation that explains what they are might be better, i dunno,
just test on some random user what amount of dox is needed for it to be
understood and usefull

[...]
-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

When the tyrant has disposed of foreign enemies by conquest or treaty, and
there is nothing more to fear from them, then he is always stirring up
some war or other, in order that the people may require a leader. -- Plato
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