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libavfilter
dualinput.c
Go to the documentation of this file.
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/*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#define MAIN 0
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#define SECOND 1
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#include "
dualinput.h
"
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#include "
libavutil/timestamp.h
"
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static
int
try_filter_frame
(
FFDualInputContext
*
s
,
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AVFilterContext
*ctx,
AVFrame
*mainpic)
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{
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int
ret
;
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/* Discard obsolete second frames: if there is a next second frame with pts
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* before the main frame, we can drop the current second. */
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while
(1) {
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AVFrame
*next_overpic =
ff_bufqueue_peek
(&s->
queue
[
SECOND
], 0);
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if
(!next_overpic && s->
second_eof
&& !s->
repeatlast
) {
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av_frame_free
(&s->
second_frame
);
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break
;
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}
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if
(!next_overpic ||
av_compare_ts
(next_overpic->
pts
, ctx->
inputs
[
SECOND
]->
time_base
,
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mainpic->
pts
, ctx->
inputs
[
MAIN
]->
time_base
) > 0)
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break
;
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ff_bufqueue_get
(&s->
queue
[
SECOND
]);
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av_frame_free
(&s->
second_frame
);
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s->
second_frame
= next_overpic;
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}
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/* If there is no next frame and no EOF and the second frame is before
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* the main frame, we can not know yet if it will be superseded. */
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if
(!s->
queue
[
SECOND
].
available
&& !s->
second_eof
&&
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(!s->
second_frame
||
av_compare_ts
(s->
second_frame
->
pts
, ctx->
inputs
[
SECOND
]->
time_base
,
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mainpic->
pts
, ctx->
inputs
[
MAIN
]->
time_base
) < 0))
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return
AVERROR
(EAGAIN);
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/* At this point, we know that the current second frame extends to the
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* time of the main frame. */
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av_dlog
(ctx,
"main_pts:%s main_pts_time:%s"
,
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av_ts2str
(mainpic->
pts
),
av_ts2timestr
(mainpic->
pts
, &ctx->
inputs
[
MAIN
]->
time_base
));
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if
(s->
second_frame
)
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av_dlog
(ctx,
" second_pts:%s second_pts_time:%s"
,
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av_ts2str
(s->
second_frame
->
pts
),
av_ts2timestr
(s->
second_frame
->
pts
, &ctx->
inputs
[
SECOND
]->
time_base
));
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av_dlog
(ctx,
"\n"
);
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if
(s->
second_frame
&& !ctx->
is_disabled
)
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mainpic = s->
process
(ctx, mainpic, s->
second_frame
);
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ret =
ff_filter_frame
(ctx->
outputs
[0], mainpic);
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av_assert1
(ret !=
AVERROR
(EAGAIN));
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s->
frame_requested
= 0;
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return
ret
;
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}
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static
int
try_filter_next_frame
(
FFDualInputContext
*
s
,
AVFilterContext
*ctx)
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{
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AVFrame
*next_mainpic =
ff_bufqueue_peek
(&s->
queue
[
MAIN
], 0);
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int
ret
;
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if
(!next_mainpic)
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return
AVERROR
(EAGAIN);
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if
((ret =
try_filter_frame
(s, ctx, next_mainpic)) ==
AVERROR
(EAGAIN))
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return
ret
;
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ff_bufqueue_get
(&s->
queue
[
MAIN
]);
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return
ret
;
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}
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static
int
flush_frames
(
FFDualInputContext
*
s
,
AVFilterContext
*ctx)
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{
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int
ret
;
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while
(!(ret =
try_filter_next_frame
(s, ctx)));
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return
ret ==
AVERROR
(EAGAIN) ? 0 :
ret
;
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}
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int
ff_dualinput_filter_frame_main
(
FFDualInputContext
*
s
,
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AVFilterLink
*inlink,
AVFrame
*
in
)
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{
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AVFilterContext
*ctx = inlink->
dst
;
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int
ret
;
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if
((ret =
flush_frames
(s, ctx)) < 0)
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return
ret
;
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if
((ret =
try_filter_frame
(s, ctx, in)) < 0) {
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if
(ret !=
AVERROR
(EAGAIN))
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return
ret
;
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ff_bufqueue_add
(ctx, &s->
queue
[
MAIN
], in);
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}
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if
(!s->
second_frame
)
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return
0;
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flush_frames
(s, ctx);
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return
0;
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}
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int
ff_dualinput_filter_frame_second
(
FFDualInputContext
*
s
,
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AVFilterLink
*inlink,
AVFrame
*
in
)
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{
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AVFilterContext
*ctx = inlink->
dst
;
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int
ret
;
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if
((ret =
flush_frames
(s, ctx)) < 0)
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return
ret
;
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ff_bufqueue_add
(ctx, &s->
queue
[
SECOND
], in);
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ret =
try_filter_next_frame
(s, ctx);
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return
ret ==
AVERROR
(EAGAIN) ? 0 :
ret
;
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}
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int
ff_dualinput_request_frame
(
FFDualInputContext
*
s
,
AVFilterLink
*outlink)
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{
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AVFilterContext
*ctx = outlink->
src
;
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int
input,
ret
;
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if
(!
try_filter_next_frame
(s, ctx))
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return
0;
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s->
frame_requested
= 1;
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while
(s->
frame_requested
) {
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/* TODO if we had a frame duration, we could guess more accurately */
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input = !s->
second_eof
&& (s->
queue
[
MAIN
].
available
||
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s->
queue
[
SECOND
].
available
< 2) ?
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SECOND
:
MAIN
;
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ret =
ff_request_frame
(ctx->
inputs
[input]);
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/* EOF on main is reported immediately */
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if
(ret ==
AVERROR_EOF
&& input ==
SECOND
) {
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s->
second_eof
= 1;
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if
(s->
shortest
)
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return
ret
;
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if
((ret =
try_filter_next_frame
(s, ctx)) !=
AVERROR
(EAGAIN))
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return
ret
;
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ret = 0;
/* continue requesting frames on main */
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}
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if
(ret < 0)
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return
ret
;
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}
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return
0;
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}
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void
ff_dualinput_uninit
(
FFDualInputContext
*
s
)
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{
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av_frame_free
(&s->
second_frame
);
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ff_bufqueue_discard_all
(&s->
queue
[
MAIN
]);
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ff_bufqueue_discard_all
(&s->
queue
[
SECOND
]);
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}
Generated on Wed Jul 10 2013 23:48:09 for FFmpeg by
1.8.2