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Code Issues Releases Activity

avfilter/vsrc_gradients: add duration option

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This commit is contained in:
Paul B Mahol 2020-08-31 10:46:42 +02:00
parent 4a11a6f4cc
commit 64e93025f0
2 changed files with 19 additions and 1 deletions
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8
doc/filters.texi
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@ -22569,6 +22569,14 @@ Set number of colors to use at once. Allowed range is from 2 to 8. Default value
@item seed
Set seed for picking gradient line points.
@item duration, d
Set the duration of the sourced video. See
@ref{time duration syntax,,the Time duration section in the ffmpeg-utils(1) manual,ffmpeg-utils}
for the accepted syntax.
If not specified, or the expressed duration is negative, the video is
supposed to be generated forever.
@end table

12
libavfilter/vsrc_gradients.c
View File

@ -36,7 +36,8 @@ typedef struct GradientsContext {
int w, h;
int type;
AVRational frame_rate;
uint64_t pts;
int64_t pts;
int64_t duration; ///< duration expressed in microseconds
uint8_t color_rgba[8][4];
int nb_colors;
@ -72,6 +73,8 @@ static const AVOption gradients_options[] = {
{"nb_colors", "set the number of colors", OFFSET(nb_colors), AV_OPT_TYPE_INT, {.i64=2}, 2, 8, FLAGS },
{"n", "set the number of colors", OFFSET(nb_colors), AV_OPT_TYPE_INT, {.i64=2}, 2, 8, FLAGS },
{"seed", "set the seed", OFFSET(seed), AV_OPT_TYPE_INT64, {.i64=-1}, -1, UINT32_MAX, FLAGS },
{"duration", "set video duration", OFFSET(duration), AV_OPT_TYPE_DURATION, {.i64=-1}, -1, INT64_MAX, FLAGS },\
{"d", "set video duration", OFFSET(duration), AV_OPT_TYPE_DURATION, {.i64=-1}, -1, INT64_MAX, FLAGS },\
{NULL},
};
@ -251,6 +254,10 @@ static int gradients_request_frame(AVFilterLink *outlink)
const float w2 = s->w / 2.f;
const float h2 = s->h / 2.f;
if (s->duration >= 0 &&
av_rescale_q(s->pts, outlink->time_base, AV_TIME_BASE_Q) >= s->duration)
return AVERROR_EOF;
s->fx0 = (s->x0 - w2) * cosf(angle) - (s->y0 - h2) * sinf(angle) + w2;
s->fy0 = (s->x0 - w2) * sinf(angle) + (s->y0 - h2) * cosf(angle) + h2;
@ -260,6 +267,9 @@ static int gradients_request_frame(AVFilterLink *outlink)
if (!frame)
return AVERROR(ENOMEM);
frame->key_frame = 1;
frame->interlaced_frame = 0;
frame->pict_type = AV_PICTURE_TYPE_I;
frame->sample_aspect_ratio = (AVRational) {1, 1};
frame->pts = s->pts++;