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
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;
- AVFilterLink *outlink = inlink->dst->outputs[0];
- ThumbContext *thumb = inlink->dst->priv;
AVFilterContext *ctx = inlink->dst;
+ ThumbContext *thumb = ctx->priv;
+ AVFilterLink *outlink = ctx->outputs[0];
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) {
memset(thumb->frames[i].histogram, 0, sizeof(thumb->frames[i].histogram));
if (i == best_frame_idx)
continue;
- avfilter_unref_buffer(thumb->frames[i].buf);
- thumb->frames[i].buf = NULL;
+ avfilter_unref_bufferp(&thumb->frames[i].buf);
}
thumb->n = 0;
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)
{
int i;
ThumbContext *thumb = ctx->priv;
- for (i = 0; i < thumb->n_frames && thumb->frames[i].buf; i++) {
- avfilter_unref_buffer(thumb->frames[i].buf);
- thumb->frames[i].buf = NULL;
- }
+ for (i = 0; i < thumb->n_frames && thumb->frames[i].buf; i++)
+ avfilter_unref_bufferp(&thumb->frames[i].buf);
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;
return 0;
}
+static const AVFilterPad thumbnail_inputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .get_video_buffer = ff_null_get_video_buffer,
+ .min_perms = AV_PERM_PRESERVE,
+ .filter_frame = filter_frame,
+ },
+ { NULL }
+};
+
+static const AVFilterPad thumbnail_outputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .request_frame = request_frame,
+ .poll_frame = poll_frame,
+ },
+ { NULL }
+};
+
AVFilter avfilter_vf_thumbnail = {
.name = "thumbnail",
.description = NULL_IF_CONFIG_SMALL("Select the most representative frame in a given sequence of consecutive frames."),
.init = init,
.uninit = uninit,
.query_formats = query_formats,
- .inputs = (const AVFilterPad[]) {
- { .name = "default",
- .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,
- },{ .name = NULL }
- },
- .outputs = (const AVFilterPad[]) {
- { .name = "default",
- .type = AVMEDIA_TYPE_VIDEO,
- .request_frame = request_frame,
- .poll_frame = poll_frame,
- },{ .name = NULL }
- },
+ .inputs = thumbnail_inputs,
+ .outputs = thumbnail_outputs,
};