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Code Issues Releases Activity

avcodec/noise_bsf: restore dropamount for backwards compatibility

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This commit is contained in:
Gyan Doshi 2021-07-30 17:08:53 +05:30
parent ae94868a57
commit b9176dbfb7
3 changed files with 22 additions and 6 deletions
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7
doc/bitstream_filters.texi
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@ -538,11 +538,16 @@ Accepts an expression whose evaluation per-packet determines how often bytes in
packet will be modified. A value below 0 will result in a variable frequency.
Default is 0 which results in no modification. However, if neither amount nor drop is specified,
amount will be set to @var{-1}. See below for accepted variables.
@item drop, dropamount
@item drop
Accepts an expression evaluated per-packet whose value determines whether that packet is dropped.
Evaluation to a positive value results in the packet being dropped. Evaluation to a negative
value results in a variable chance of it being dropped, roughly inverse in proportion to the magnitude
of the value. Default is 0 which results in no drops. See below for accepted variables.
@item dropamount
Accepts a non-negative integer, which assigns a variable chance of it being dropped, roughly inverse
in proportion to the value. Default is 0 which results in no drops. This option is kept for backwards
compatibility and is equivalent to setting drop to a negative value with the same magnitude
i.e. @code{dropamount=4} is the same as @code{drop=-4}. Ignored if drop is also specified.
@end table
Both @code{amount} and @code{drop} accept expressions containing the following variables:

19
libavcodec/noise_bsf.c
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@ -65,6 +65,7 @@ typedef struct NoiseContext {
char *amount_str;
char *drop_str;
int dropamount;
AVExpr *amount_pexpr;
AVExpr *drop_pexpr;
@ -81,7 +82,7 @@ static int noise_init(AVBSFContext *ctx)
int ret;
if (!s->amount_str) {
s->amount_str = !s->drop_str ? av_strdup("-1") : av_strdup("0");
s->amount_str = (!s->drop_str && !s->dropamount) ? av_strdup("-1") : av_strdup("0");
if (!s->amount_str)
return AVERROR(ENOMEM);
}
@ -93,6 +94,12 @@ static int noise_init(AVBSFContext *ctx)
return ret;
}
if (s->drop_str && s->dropamount) {
av_log(ctx, AV_LOG_WARNING, "Both drop '%s' and dropamount=%d set. Ignoring dropamount.\n",
s->drop_str, s->dropamount);
s->dropamount = 0;
}
if (s->drop_str) {
ret = av_expr_parse(&s->drop_pexpr, s->drop_str,
var_names, NULL, NULL, NULL, NULL, 0, ctx);
@ -114,7 +121,7 @@ static int noise_init(AVBSFContext *ctx)
static int noise(AVBSFContext *ctx, AVPacket *pkt)
{
NoiseContext *s = ctx->priv_data;
int i, ret, amount, drop;
int i, ret, amount, drop = 0;
double res;
ret = ff_bsf_get_packet_ref(ctx, pkt);
@ -156,10 +163,14 @@ static int noise(AVBSFContext *ctx, AVPacket *pkt)
drop = !!res;
}
if(s->dropamount) {
drop = !(s->state % s->dropamount);
}
av_log(ctx, AV_LOG_VERBOSE, "Stream #%d packet %d pts %"PRId64" - amount %d drop %d\n",
pkt->stream_index, (unsigned int)s->var_values[VAR_N], pkt->pts, amount, drop);
if (s->drop_str && drop) {
if (drop) {
s->var_values[VAR_STATE] = ++s->state;
av_packet_unref(pkt);
return AVERROR(EAGAIN);
@ -198,7 +209,7 @@ static void noise_close(AVBSFContext *bsf)
static const AVOption options[] = {
{ "amount", NULL, OFFSET(amount_str), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, FLAGS },
{ "drop", NULL, OFFSET(drop_str), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, FLAGS },
{ "dropamount", NULL, OFFSET(drop_str), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, FLAGS },
{ "dropamount", NULL, OFFSET(dropamount), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, FLAGS },
{ NULL },
};

2
tests/fate/matroska.mak
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@ -88,7 +88,7 @@ FATE_MATROSKA_FFMPEG_FFPROBE-$(call ALLYES, FILE_PROTOCOL MXF_DEMUXER \
MATROSKA_MUXER MATROSKA_DEMUXER \
FRAMECRC_MUXER PIPE_PROTOCOL) \
+= fate-matroska-mastering-display-metadata
fate-matroska-mastering-display-metadata: CMD = transcode mxf $(TARGET_SAMPLES)/mxf/Meridian-Apple_ProResProxy-HDR10.mxf matroska "-map 0 -map 0:0 -c:v:0 copy -c:v:1 ffv1 -c:a:0 copy -bsf:a:0 noise=amount=3 -filter:a:1 aresample -c:a:1 pcm_s16be -bsf:a:1 noise=amount=-1:dropamount=-4" "-map 0 -c copy" "" "-show_entries stream_side_data_list:stream=index,codec_name"
fate-matroska-mastering-display-metadata: CMD = transcode mxf $(TARGET_SAMPLES)/mxf/Meridian-Apple_ProResProxy-HDR10.mxf matroska "-map 0 -map 0:0 -c:v:0 copy -c:v:1 ffv1 -c:a:0 copy -bsf:a:0 noise=amount=3 -filter:a:1 aresample -c:a:1 pcm_s16be -bsf:a:1 noise=amount=-1:drop=-4" "-map 0 -c copy" "" "-show_entries stream_side_data_list:stream=index,codec_name"
# This test tests remuxing annex B H.264 into Matroska. It also tests writing
# the correct interlaced flags and overriding the sample aspect ratio, leading