static int request_frame(AVFilterLink *outlink)
{
AVFilterContext *ctx = outlink->src;
ZPContext *s = ctx->priv;
AVFrame *in = s->in;
double zoom, dx, dy;
int ret;
if (in) {
ret = output_single_frame(ctx, in, s->var_values, s->current_frame,
&zoom, &dx, &dy);
if (ret < 0)
goto fail;
}
if (s->current_frame >= s->nb_frames) {
s->x = dx;
s->y = dy;
s->prev_zoom = zoom;
s->prev_nb_frames = s->nb_frames;
s->nb_frames = 0;
s->current_frame = 0;
av_frame_free(&s->in);
ret = 0;
s->finished = 1;
ret = ff_request_frame(ctx->inputs[0]);
}
fail:
sws_freeContext(s->sws);
s->sws = NULL;
return ret;
}
static int activate(AVFilterContext *ctx)
{
ZPContext *s = ctx->priv;
AVFilterLink *inlink = ctx->inputs[0];
AVFilterLink *outlink = ctx->outputs[0];
int status, ret = 0;
int64_t pts;
if (s->in && ff_outlink_frame_wanted(outlink)) {
double zoom = -1, dx = -1, dy = -1;
ret = output_single_frame(ctx, s->in, s->var_values, s->current_frame,
&zoom, &dx, &dy);
if (ret < 0)
return ret;
}
if (!s->in && (ret = ff_inlink_consume_frame(inlink, &s->in)) > 0) {
double zoom = -1, dx = -1, dy = -1, nb_frames;
s->finished = 0;
s->var_values[VAR_IN_W] = s->var_values[VAR_IW] = s->in->width;
s->var_values[VAR_IN_H] = s->var_values[VAR_IH] = s->in->height;
s->var_values[VAR_OUT_W] = s->var_values[VAR_OW] = s->w;
s->var_values[VAR_OUT_H] = s->var_values[VAR_OH] = s->h;
s->var_values[VAR_IN] = inlink->frame_count_out + 1;
s->var_values[VAR_ON] = outlink->frame_count_in + 1;
s->var_values[VAR_PX] = s->x;
s->var_values[VAR_PY] = s->y;
s->var_values[VAR_X] = 0;
s->var_values[VAR_Y] = 0;
s->var_values[VAR_PZOOM] = s->prev_zoom;
s->var_values[VAR_ZOOM] = 1;
s->var_values[VAR_PDURATION] = s->prev_nb_frames;
s->var_values[VAR_A] = (double) s->in->width / s->in->height;
s->var_values[VAR_SAR] = inlink->sample_aspect_ratio.num ?
(double) inlink->sample_aspect_ratio.num / inlink->sample_aspect_ratio.den : 1;
s->var_values[VAR_DAR] = s->var_values[VAR_A] * s->var_values[VAR_SAR];
s->var_values[VAR_HSUB] = 1 << s->desc->log2_chroma_w;
s->var_values[VAR_VSUB] = 1 << s->desc->log2_chroma_h;
if ((ret = av_expr_parse_and_eval(&nb_frames, s->duration_expr_str,
var_names, s->var_values,
NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0) {
av_frame_free(&s->in);
return ret;
}
s->var_values[VAR_DURATION] = s->nb_frames = nb_frames;
ret = output_single_frame(ctx, s->in, s->var_values, s->current_frame,
&zoom, &dx, &dy);
if (ret < 0)
return ret;
}
if (ret < 0) {
return ret;
} else if (s->finished && ff_inlink_acknowledge_status(inlink, &status, &pts)) {
ff_outlink_set_status(outlink, status, pts);
return 0;
} else {
if (ff_outlink_frame_wanted(outlink) && s->finished)
ff_inlink_request_frame(inlink);
return 0;
}
}
