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lavfi/thumbnail: switch to filter_frame.

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This commit is contained in:
Clément Bœsch 2012-11-29 01:33:25 +01:00
parent 69d4420aea
commit 24f425319d
1 changed files with 16 additions and 32 deletions
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48
libavfilter/vf_thumbnail.c
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@ -68,27 +68,6 @@ static av_cold int init(AVFilterContext *ctx, const char *args)
return 0;
}
static int draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir)
{
int i, j;
AVFilterContext *ctx = inlink->dst;
ThumbContext *thumb = ctx->priv;
int *hist = thumb->frames[thumb->n].histogram;
AVFilterBufferRef *picref = inlink->cur_buf;
const uint8_t *p = picref->data[0] + y * picref->linesize[0];
// update current frame RGB histogram
for (j = 0; j < h; j++) {
for (i = 0; i < inlink->w; i++) {
hist[0*256 + p[i*3 ]]++;
hist[1*256 + p[i*3 + 1]]++;
hist[2*256 + p[i*3 + 2]]++;
}
p += picref->linesize[0];
}
return 0;
}
/**
* @brief Compute Sum-square deviation to estimate "closeness".
* @param hist color distribution histogram
@ -107,7 +86,7 @@ static double frame_sum_square_err(const int *hist, const double *median)
return sum_sq_err;
}
static int end_frame(AVFilterLink *inlink)
static int filter_frame(AVFilterLink *inlink, AVFilterBufferRef *frame)
{
int i, j, best_frame_idx = 0;
double avg_hist[HIST_SIZE] = {0}, sq_err, min_sq_err = -1;
@ -115,10 +94,21 @@ static int end_frame(AVFilterLink *inlink)
ThumbContext *thumb = inlink->dst->priv;
AVFilterContext *ctx = inlink->dst;
AVFilterBufferRef *picref;
int *hist = thumb->frames[thumb->n].histogram;
const uint8_t *p = frame->data[0];
// keep a reference of each frame
thumb->frames[thumb->n].buf = inlink->cur_buf;
inlink->cur_buf = NULL;
thumb->frames[thumb->n].buf = frame;
// update current frame RGB histogram
for (j = 0; j < inlink->h; j++) {
for (i = 0; i < inlink->w; i++) {
hist[0*256 + p[i*3 ]]++;
hist[1*256 + p[i*3 + 1]]++;
hist[2*256 + p[i*3 + 2]]++;
}
p += frame->linesize[0];
}
// no selection until the buffer of N frames is filled up
if (thumb->n < thumb->n_frames - 1) {
@ -154,10 +144,8 @@ static int end_frame(AVFilterLink *inlink)
picref = thumb->frames[best_frame_idx].buf;
av_log(ctx, AV_LOG_INFO, "frame id #%d (pts_time=%f) selected\n",
best_frame_idx, picref->pts * av_q2d(inlink->time_base));
ff_start_frame(outlink, picref);
thumb->frames[best_frame_idx].buf = NULL;
ff_draw_slice(outlink, 0, inlink->h, 1);
return ff_end_frame(outlink);
return ff_filter_frame(outlink, picref);
}
static av_cold void uninit(AVFilterContext *ctx)
@ -171,8 +159,6 @@ static av_cold void uninit(AVFilterContext *ctx)
av_freep(&thumb->frames);
}
static int null_start_frame(AVFilterLink *link, AVFilterBufferRef *picref) { return 0; }
static int request_frame(AVFilterLink *link)
{
ThumbContext *thumb = link->src->priv;
@ -225,9 +211,7 @@ static const AVFilterPad thumbnail_inputs[] = {
.type = AVMEDIA_TYPE_VIDEO,
.get_video_buffer = ff_null_get_video_buffer,
.min_perms = AV_PERM_PRESERVE,
.start_frame = null_start_frame,
.draw_slice = draw_slice,
.end_frame = end_frame,
.filter_frame = filter_frame,
},
{ NULL }
};