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submodule
ffmpeg
Commits
c8ef3093
Commit
c8ef3093
authored
Aug 29, 2012
by
Stefano Sabatini
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examples: add demuxing.c example
parent
f7eec895
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.gitignore
.gitignore
+1
-0
Makefile
doc/examples/Makefile
+1
-0
demuxing.c
doc/examples/demuxing.c
+193
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.gitignore
View file @
c8ef3093
...
@@ -27,6 +27,7 @@
...
@@ -27,6 +27,7 @@
/doc/avoptions_codec.texi
/doc/avoptions_codec.texi
/doc/avoptions_format.texi
/doc/avoptions_format.texi
/doc/examples/decoding_encoding
/doc/examples/decoding_encoding
/doc/examples/demuxing
/doc/examples/filtering_audio
/doc/examples/filtering_audio
/doc/examples/filtering_video
/doc/examples/filtering_video
/doc/examples/metadata
/doc/examples/metadata
...
...
doc/examples/Makefile
View file @
c8ef3093
...
@@ -12,6 +12,7 @@ CFLAGS := $(shell pkg-config --cflags $(FFMPEG_LIBS)) $(CFLAGS)
...
@@ -12,6 +12,7 @@ CFLAGS := $(shell pkg-config --cflags $(FFMPEG_LIBS)) $(CFLAGS)
LDLIBS
:=
$(
shell
pkg-config
--libs
$(FFMPEG_LIBS))
$(LDLIBS)
LDLIBS
:=
$(
shell
pkg-config
--libs
$(FFMPEG_LIBS))
$(LDLIBS)
EXAMPLES
=
decoding_encoding
\
EXAMPLES
=
decoding_encoding
\
demuxing
\
filtering_video
\
filtering_video
\
filtering_audio
\
filtering_audio
\
metadata
\
metadata
\
...
...
doc/examples/demuxing.c
0 → 100644
View file @
c8ef3093
/*
* Copyright (c) 2012 Stefano Sabatini
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
/**
* @file
* libavformat demuxing API use example.
*
* Show how to use the libavformat and libavcodec API to demux and
* decode video data.
*/
#include <libavutil/imgutils.h>
#include <libavutil/timestamp.h>
#include <libavformat/avformat.h>
static
AVFormatContext
*
fmt_ctx
=
NULL
;
static
AVCodecContext
*
dec_ctx
=
NULL
;
static
AVCodec
*
dec
=
NULL
;
static
AVStream
*
stream
=
NULL
;
static
const
char
*
src_filename
=
NULL
;
static
const
char
*
dst_filename
=
NULL
;
static
FILE
*
dst_file
=
NULL
;
static
uint8_t
*
dst_data
[
4
]
=
{
NULL
};
static
int
dst_linesize
[
4
];
static
int
dst_bufsize
;
static
int
stream_idx
;
static
AVFrame
*
frame
=
NULL
;
static
AVPacket
pkt
;
static
int
frame_count
=
0
;
static
int
decode_packet
(
int
*
got_frame
,
int
cached
)
{
int
ret
;
if
(
pkt
.
stream_index
!=
stream_idx
)
return
0
;
/* decode video frame */
ret
=
avcodec_decode_video2
(
dec_ctx
,
frame
,
got_frame
,
&
pkt
);
if
(
ret
<
0
)
{
fprintf
(
stderr
,
"Error decoding video frame
\n
"
);
return
ret
;
}
if
(
*
got_frame
)
{
printf
(
"frame%s n:%d coded_n:%d pts:%s
\n
"
,
cached
?
"(cached)"
:
""
,
frame_count
++
,
frame
->
coded_picture_number
,
av_ts2timestr
(
frame
->
pts
,
&
dec_ctx
->
time_base
));
/* copy decoded frame to destination buffer:
* this is required since rawvideo expect non aligned data */
av_image_copy
(
dst_data
,
dst_linesize
,
(
const
uint8_t
**
)(
frame
->
data
),
frame
->
linesize
,
dec_ctx
->
pix_fmt
,
dec_ctx
->
width
,
dec_ctx
->
height
);
/* write to rawvideo file */
fwrite
(
dst_data
[
0
],
1
,
dst_bufsize
,
dst_file
);
}
return
ret
;
}
int
main
(
int
argc
,
char
**
argv
)
{
int
ret
,
got_frame
;
if
(
argc
!=
3
)
{
fprintf
(
stderr
,
"usage: %s input_file output_file
\n
"
"API example program to show how to read frames from an input file.
\n
"
"This program reads frames from a file, decode them, and write them "
"to a rawvideo file named like output_file."
"
\n
"
,
argv
[
0
]);
exit
(
1
);
}
src_filename
=
argv
[
1
];
dst_filename
=
argv
[
2
];
/* register all formats and codecs */
av_register_all
();
/* open input file, and allocated format context */
if
(
avformat_open_input
(
&
fmt_ctx
,
src_filename
,
NULL
,
NULL
)
<
0
)
{
fprintf
(
stderr
,
"Could not open source file %s
\n
"
,
src_filename
);
exit
(
1
);
}
/* retrieve stream information */
if
(
avformat_find_stream_info
(
fmt_ctx
,
NULL
)
<
0
)
{
fprintf
(
stderr
,
"Could not find stream information
\n
"
);
exit
(
1
);
}
ret
=
av_find_best_stream
(
fmt_ctx
,
AVMEDIA_TYPE_VIDEO
,
-
1
,
-
1
,
NULL
,
0
);
if
(
ret
<
0
)
{
fprintf
(
stderr
,
"Could not find video stream in file
\n
"
);
goto
end
;
}
stream_idx
=
ret
;
stream
=
fmt_ctx
->
streams
[
stream_idx
];
/* find decoder for the stream */
dec_ctx
=
stream
->
codec
;
dec
=
avcodec_find_decoder
(
dec_ctx
->
codec_id
);
if
(
!
dec
)
{
fprintf
(
stderr
,
"Failed to find any codec
\n
"
);
ret
=
1
;
goto
end
;
}
if
((
ret
=
avcodec_open2
(
dec_ctx
,
dec
,
NULL
))
<
0
)
{
fprintf
(
stderr
,
"Failed to open codec
\n
"
);
goto
end
;
}
/* dump input information to stderr */
av_dump_format
(
fmt_ctx
,
0
,
src_filename
,
0
);
dst_file
=
fopen
(
dst_filename
,
"wb"
);
if
(
!
dst_file
)
{
fprintf
(
stderr
,
"Could not open destination file %s
\n
"
,
dst_filename
);
ret
=
1
;
goto
end
;
}
frame
=
avcodec_alloc_frame
();
if
(
!
frame
)
{
fprintf
(
stderr
,
"Could not allocate video frame
\n
"
);
ret
=
1
;
goto
end
;
}
/* allocate image where the decoded image will be put */
ret
=
av_image_alloc
(
dst_data
,
dst_linesize
,
dec_ctx
->
width
,
dec_ctx
->
height
,
dec_ctx
->
pix_fmt
,
1
);
if
(
ret
<
0
)
{
fprintf
(
stderr
,
"Could not alloc raw video buffer
\n
"
);
goto
end
;
}
dst_bufsize
=
ret
;
/* initialize packet, set data to NULL, let the demuxer fill it */
av_init_packet
(
&
pkt
);
pkt
.
size
=
0
;
pkt
.
data
=
NULL
;
printf
(
"Demuxing file '%s' to '%s'
\n
"
,
src_filename
,
dst_filename
);
/* read frames from the file */
while
(
av_read_frame
(
fmt_ctx
,
&
pkt
)
>=
0
)
decode_packet
(
&
got_frame
,
0
);
/* flush cached frames */
pkt
.
data
=
NULL
;
pkt
.
size
=
0
;
do
{
decode_packet
(
&
got_frame
,
1
);
}
while
(
got_frame
);
printf
(
"Demuxing succeeded. Play the output file with the command:
\n
"
"ffplay -f rawvideo -pix_fmt %s -video_size %dx%d %s
\n
"
,
av_get_pix_fmt_name
(
dec_ctx
->
pix_fmt
),
dec_ctx
->
width
,
dec_ctx
->
height
,
dst_filename
);
end:
avcodec_close
(
dec_ctx
);
avformat_close_input
(
&
fmt_ctx
);
if
(
dst_file
)
fclose
(
dst_file
);
av_free
(
frame
);
av_free
(
dst_data
[
0
]);
return
ret
<
0
;
}
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