[FFmpeg-devel] [PATCH] ffprobe: add INI writer

[Stefano Sabatini]

On date Sunday 2012-05-27 01:37:13 +0200, Stefano Sabatini encoded:
> Liberally based on the work of Luca Barbato <lu_zero at gentoo.org>, done
> for libav/avprobe.
> ---
>  doc/ffprobe.texi |   24 +++++++++
>  ffprobe.c        |  144 +++++++++++++++++++++++++++++++++++++++++++++++++++++-
>  2 files changed, 167 insertions(+), 1 deletions(-)

Output example:
$ ffprobe -print_format ini  ~/src/ffmpeg/ffprobe-test.nut -show_streams -show_format  -show_versions -show_packets -show_frames > ffprobe.ini
$ cat ffprobe.ini
# ffprobe output

[program_version]
version=N-41042-g5536632
copyright=Copyright (c) 2007-2012 the FFmpeg developers
build_date=May 27 2012
build_time=01\:39\:03
compiler_type=gcc
compiler_version=4.6.1
configuration=...

[library_version.0]
name=libavutil
major=51
minor=54
micro=100
version=3356260

[library_version.1]
name=libavcodec
major=54
minor=23
micro=100
version=3544932

...
[packet.115]
codec_type=video
stream_index=2
pts=49
pts_time=1.960000
dts=49
dts_time=1.960000
duration=1
duration_time=0.040000
size=12288
pos=1283672
flags=K

[frame.115]
media_type=video
key_frame=1
pkt_pts=49
pkt_pts_time=1.960000
pkt_dts=49
pkt_dts_time=1.960000
pkt_pos=1283672
width=64
height=64
pix_fmt=rgb24
sample_aspect_ratio=N/A
pict_type=I
coded_picture_number=0
display_picture_number=0
interlaced_frame=0
top_field_first=0
repeat_pict=0
reference=0

[stream.0]
index=0
codec_name=pcm_s16le
codec_long_name=PCM signed 16-bit little-endian
profile=unknown
codec_type=audio
codec_time_base=1/8000
codec_tag_string=[1][0][0][0]
codec_tag=0x0001
sample_fmt=s16
sample_rate=8000
channels=2
bits_per_sample=16
id=N/A
r_frame_rate=0/0
avg_frame_rate=0/0
time_base=1/2000
start_time=0.000000
duration=40.499000
bit_rate=256000
nb_frames=N/A
nb_read_frames=16
nb_read_packets=16

[stream.1]
index=1
codec_name=rawvideo
codec_long_name=raw video
profile=unknown
codec_type=video
codec_time_base=1/25
codec_tag_string=RGB[24]
codec_tag=0x18424752
width=64
height=64
has_b_frames=0
sample_aspect_ratio=N/A
display_aspect_ratio=N/A
pix_fmt=rgb24
level=-99
timecode=N/A
id=N/A
r_frame_rate=25/1
avg_frame_rate=0/0
time_base=1/25
start_time=0.000000
duration=40.480000
bit_rate=N/A
nb_frames=N/A
nb_read_frames=50
nb_read_packets=50

[stream.2]
index=2
codec_name=rawvideo
codec_long_name=raw video
...

[format]
filename=/home/stefano/src/ffmpeg/ffprobe-test.nut
nb_streams=3
format_name=nut
format_long_name=NUT format
start_time=0.000000
duration=40.499000
size=1295960
bit_rate=255998

[format.tags]
title=ffprobe test file
comment='A comment wih XML & JSON special chars'\: <tag value\="x">
encoder=Lavf53.14.0
...


avprobe format is a bit different, for example:
stream.2 -> streams.stream.2

With frames/packets I could try to make it appear a bit more useful,
for example it could be (straining a bit the printer model):
streams.stream.2.packet.3

INI is not a well specified format, see for example:
http://en.wikipedia.org/wiki/INI_file

so there are *a lot* of variants, in particular, see "Hierarchy"
section in the above mentioned page:

|Most commonly, INI files have no hierarchy of sections within
|sections. Some files appear to have a hierarchical naming convention,
|however. For section A, subsection B, sub-subsection C, property P
|and value V, they may accept entries such as [A.B.C] and P=V
|(Windows' xstart.ini), [A\B\C] and P=V (the IBM Windows driver file
|devlist.ini), or [A] and B,C,P = V (Microsoft Visual Studio file
|AEMANAGR.INI).
|
|It is unclear whether these are simply naming conventions that an
|application happens to use in order to give the appearance of a
|hierarchy, or whether the file is being read by a module that
|actually presents this hierarchy to the application programmer.

I can easily implement this behavior, or add a switch for that if it
seems worth the effort.
-- 
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