#include "libavutil/eval.h"
#include "libavutil/fifo.h"
+#include "libavutil/internal.h"
#include "libavutil/mathematics.h"
+#include "libavutil/opt.h"
#include "avfilter.h"
#include "internal.h"
#include "video.h"
VAR_PREV_SELECTED_N,
VAR_KEY,
- VAR_POS,
VAR_VARS_NB
};
#define FIFO_SIZE 8
typedef struct {
+ const AVClass *class;
+ char *expr_str;
AVExpr *expr;
double var_values[VAR_VARS_NB];
double select;
AVFifoBuffer *pending_frames; ///< FIFO buffer of video frames
} SelectContext;
-static av_cold int init(AVFilterContext *ctx, const char *args)
+static av_cold int init(AVFilterContext *ctx)
{
SelectContext *select = ctx->priv;
int ret;
- if ((ret = av_expr_parse(&select->expr, args ? args : "1",
+ if ((ret = av_expr_parse(&select->expr, select->expr_str,
var_names, NULL, NULL, NULL, NULL, 0, ctx)) < 0) {
- av_log(ctx, AV_LOG_ERROR, "Error while parsing expression '%s'\n", args);
+ av_log(ctx, AV_LOG_ERROR, "Error while parsing expression '%s'\n",
+ select->expr_str);
return ret;
}
- select->pending_frames = av_fifo_alloc(FIFO_SIZE*sizeof(AVFilterBufferRef*));
+ select->pending_frames = av_fifo_alloc(FIFO_SIZE*sizeof(AVFrame*));
if (!select->pending_frames) {
av_log(ctx, AV_LOG_ERROR, "Failed to allocate pending frames buffer.\n");
return AVERROR(ENOMEM);
#define D2TS(d) (isnan(d) ? AV_NOPTS_VALUE : (int64_t)(d))
#define TS2D(ts) ((ts) == AV_NOPTS_VALUE ? NAN : (double)(ts))
-static int select_frame(AVFilterContext *ctx, AVFilterBufferRef *picref)
+static int select_frame(AVFilterContext *ctx, AVFrame *frame)
{
SelectContext *select = ctx->priv;
AVFilterLink *inlink = ctx->inputs[0];
double res;
if (isnan(select->var_values[VAR_START_PTS]))
- select->var_values[VAR_START_PTS] = TS2D(picref->pts);
+ select->var_values[VAR_START_PTS] = TS2D(frame->pts);
if (isnan(select->var_values[VAR_START_T]))
- select->var_values[VAR_START_T] = TS2D(picref->pts) * av_q2d(inlink->time_base);
+ select->var_values[VAR_START_T] = TS2D(frame->pts) * av_q2d(inlink->time_base);
- select->var_values[VAR_PTS] = TS2D(picref->pts);
- select->var_values[VAR_T ] = TS2D(picref->pts) * av_q2d(inlink->time_base);
- select->var_values[VAR_POS] = picref->pos == -1 ? NAN : picref->pos;
- select->var_values[VAR_PREV_PTS] = TS2D(picref ->pts);
+ select->var_values[VAR_PTS] = TS2D(frame->pts);
+ select->var_values[VAR_T ] = TS2D(frame->pts) * av_q2d(inlink->time_base);
+ select->var_values[VAR_PREV_PTS] = TS2D(frame->pts);
select->var_values[VAR_INTERLACE_TYPE] =
- !picref->video->interlaced ? INTERLACE_TYPE_P :
- picref->video->top_field_first ? INTERLACE_TYPE_T : INTERLACE_TYPE_B;
- select->var_values[VAR_PICT_TYPE] = picref->video->pict_type;
+ !frame->interlaced_frame ? INTERLACE_TYPE_P :
+ frame->top_field_first ? INTERLACE_TYPE_T : INTERLACE_TYPE_B;
+ select->var_values[VAR_PICT_TYPE] = frame->pict_type;
res = av_expr_eval(select->expr, select->var_values, NULL);
av_log(inlink->dst, AV_LOG_DEBUG,
- "n:%d pts:%d t:%f pos:%d interlace_type:%c key:%d pict_type:%c "
+ "n:%d pts:%d t:%f interlace_type:%c key:%d pict_type:%c "
"-> select:%f\n",
(int)select->var_values[VAR_N],
(int)select->var_values[VAR_PTS],
select->var_values[VAR_T],
- (int)select->var_values[VAR_POS],
select->var_values[VAR_INTERLACE_TYPE] == INTERLACE_TYPE_P ? 'P' :
select->var_values[VAR_INTERLACE_TYPE] == INTERLACE_TYPE_T ? 'T' :
select->var_values[VAR_INTERLACE_TYPE] == INTERLACE_TYPE_B ? 'B' : '?',
return res;
}
-static int start_frame(AVFilterLink *inlink, AVFilterBufferRef *picref)
+static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
{
SelectContext *select = inlink->dst->priv;
- select->select = select_frame(inlink->dst, picref);
+ select->select = select_frame(inlink->dst, frame);
if (select->select) {
/* frame was requested through poll_frame */
if (select->cache_frames) {
- if (!av_fifo_space(select->pending_frames))
+ if (!av_fifo_space(select->pending_frames)) {
av_log(inlink->dst, AV_LOG_ERROR,
"Buffering limit reached, cannot cache more frames\n");
- else
- av_fifo_generic_write(select->pending_frames, &picref,
- sizeof(picref), NULL);
+ av_frame_free(&frame);
+ } else
+ av_fifo_generic_write(select->pending_frames, &frame,
+ sizeof(frame), NULL);
return 0;
}
- return ff_start_frame(inlink->dst->outputs[0], avfilter_ref_buffer(picref, ~0));
+ return ff_filter_frame(inlink->dst->outputs[0], frame);
}
- return 0;
-}
-
-static int draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir)
-{
- SelectContext *select = inlink->dst->priv;
-
- if (select->select && !select->cache_frames)
- return ff_draw_slice(inlink->dst->outputs[0], y, h, slice_dir);
- return 0;
-}
-
-static int end_frame(AVFilterLink *inlink)
-{
- SelectContext *select = inlink->dst->priv;
-
- if (select->select) {
- if (select->cache_frames)
- return 0;
- return ff_end_frame(inlink->dst->outputs[0]);
- }
+ av_frame_free(&frame);
return 0;
}
select->select = 0;
if (av_fifo_size(select->pending_frames)) {
- AVFilterBufferRef *picref;
- int ret;
-
- av_fifo_generic_read(select->pending_frames, &picref, sizeof(picref), NULL);
- if ((ret = ff_start_frame(outlink, picref)) < 0 ||
- (ret = ff_draw_slice(outlink, 0, outlink->h, 1)) < 0 ||
- (ret = ff_end_frame(outlink)) < 0);
+ AVFrame *frame;
- return ret;
+ av_fifo_generic_read(select->pending_frames, &frame, sizeof(frame), NULL);
+ return ff_filter_frame(outlink, frame);
}
while (!select->select) {
select->cache_frames = 0;
}
- return av_fifo_size(select->pending_frames)/sizeof(AVFilterBufferRef *);
+ return av_fifo_size(select->pending_frames)/sizeof(AVFrame*);
}
static av_cold void uninit(AVFilterContext *ctx)
{
SelectContext *select = ctx->priv;
- AVFilterBufferRef *picref;
+ AVFrame *frame;
av_expr_free(select->expr);
select->expr = NULL;
while (select->pending_frames &&
- av_fifo_generic_read(select->pending_frames, &picref, sizeof(picref), NULL) == sizeof(picref))
- avfilter_unref_buffer(picref);
+ av_fifo_generic_read(select->pending_frames, &frame, sizeof(frame), NULL) == sizeof(frame))
+ av_frame_free(&frame);
av_fifo_free(select->pending_frames);
select->pending_frames = NULL;
}
-AVFilter avfilter_vf_select = {
+#define OFFSET(x) offsetof(SelectContext, x)
+#define FLAGS AV_OPT_FLAG_VIDEO_PARAM
+static const AVOption options[] = {
+ { "expr", "An expression to use for selecting frames", OFFSET(expr_str), AV_OPT_TYPE_STRING, { .str = "1" }, .flags = FLAGS },
+ { NULL },
+};
+
+static const AVClass select_class = {
+ .class_name = "select",
+ .item_name = av_default_item_name,
+ .option = options,
+ .version = LIBAVUTIL_VERSION_INT,
+};
+
+static const AVFilterPad avfilter_vf_select_inputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .get_video_buffer = ff_null_get_video_buffer,
+ .config_props = config_input,
+ .filter_frame = filter_frame,
+ },
+ { NULL }
+};
+
+static const AVFilterPad avfilter_vf_select_outputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .poll_frame = poll_frame,
+ .request_frame = request_frame,
+ },
+ { NULL }
+};
+
+AVFilter ff_vf_select = {
.name = "select",
.description = NULL_IF_CONFIG_SMALL("Select frames to pass in output."),
.init = init,
.uninit = uninit,
.priv_size = sizeof(SelectContext),
+ .priv_class = &select_class,
- .inputs = (const AVFilterPad[]) {{ .name = "default",
- .type = AVMEDIA_TYPE_VIDEO,
- .get_video_buffer = ff_null_get_video_buffer,
- .config_props = config_input,
- .start_frame = start_frame,
- .draw_slice = draw_slice,
- .end_frame = end_frame },
- { .name = NULL }},
- .outputs = (const AVFilterPad[]) {{ .name = "default",
- .type = AVMEDIA_TYPE_VIDEO,
- .poll_frame = poll_frame,
- .request_frame = request_frame, },
- { .name = NULL}},
+ .inputs = avfilter_vf_select_inputs,
+ .outputs = avfilter_vf_select_outputs,
};
projects / ffmpeg / blobdiff