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avcodec/noise_bsf: add support for dropping packets 

Signed-off-by: Marton Balint <cus@passwd.hu>
This commit is contained in:
Marton Balint 2017-07-08 12:37:59 +02:00
parent fe9242204d
commit b406f387c8
3 changed files with 20 additions and 4 deletions
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14
doc/bitstream_filters.texi
View File

@ -220,19 +220,27 @@ ffmpeg -i INPUT.avi -codec copy -bsf:v mpeg4_unpack_bframes OUTPUT.avi
@section noise
Damages the contents of packets without damaging the container. Can be
used for fuzzing or testing error resilience/concealment.
Damages the contents of packets or simply drops them without damaging the
container. Can be used for fuzzing or testing error resilience/concealment.
Parameters:
@table @option
@item amount
A numeral string, whose value is related to how often output bytes will
be modified. Therefore, values below or equal to 0 are forbidden, and
the lower the more frequent bytes will be modified, with 1 meaning
every byte is modified.
@item dropamount
A numeral string, whose value is related to how often packets will be dropped.
Therefore, values below or equal to 0 are forbidden, and the lower the more
frequent packets will be dropped, with 1 meaning every packet is dropped.
@end table
The following example applies the modification to every byte but does not drop
any packets.
@example
ffmpeg -i INPUT -c copy -bsf noise[=1] output.mkv
@end example
applies the modification to every byte.
@section null
This bitstream filter passes the packets through unchanged.

8
libavcodec/noise_bsf.c
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@ -31,6 +31,7 @@
typedef struct NoiseContext {
const AVClass *class;
int amount;
int dropamount;
unsigned int state;
} NoiseContext;
@ -48,6 +49,12 @@ static int noise(AVBSFContext *ctx, AVPacket *out)
if (ret < 0)
return ret;
if (s->dropamount > 0 && s->state % s->dropamount == 0) {
s->state++;
av_packet_free(&in);
return AVERROR(EAGAIN);
}
ret = av_new_packet(out, in->size);
if (ret < 0)
goto fail;
@ -73,6 +80,7 @@ fail:
#define OFFSET(x) offsetof(NoiseContext, x)
static const AVOption options[] = {
{ "amount", NULL, OFFSET(amount), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX },
{ "dropamount", NULL, OFFSET(dropamount), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX },
{ NULL },
};

2
libavcodec/version.h
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@ -29,7 +29,7 @@
#define LIBAVCODEC_VERSION_MAJOR 57
#define LIBAVCODEC_VERSION_MINOR 100
#define LIBAVCODEC_VERSION_MICRO 103
#define LIBAVCODEC_VERSION_MICRO 104
#define LIBAVCODEC_VERSION_INT AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \
LIBAVCODEC_VERSION_MINOR, \