[FFmpeg-devel] [PATCH] avfilter: add framerate video filter
Paul B Mahol
onemda at gmail.com
Fri Jul 24 09:09:16 CEST 2015
Signed-off-by: Paul B Mahol <onemda at gmail.com>
---
doc/filters.texi | 45 ++++
libavfilter/Makefile | 1 +
libavfilter/allfilters.c | 1 +
libavfilter/vf_framerate.c | 632 +++++++++++++++++++++++++++++++++++++++++++++
4 files changed, 679 insertions(+)
create mode 100644 libavfilter/vf_framerate.c
diff --git a/doc/filters.texi b/doc/filters.texi
index 35a24cc..ab613dc 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -5866,6 +5866,51 @@ ffmpeg -i LEFT -i RIGHT -filter_complex framepack=frameseq OUTPUT
ffmpeg -i LEFT -i RIGHT -filter_complex [0:v]scale=w=iw/2[left],[1:v]scale=w=iw/2[right],[left][right]framepack=sbs OUTPUT
@end example
+ at section framerate
+
+Change the frame rate by interpolating new video output frames from the source
+frames.
+
+This filter is not designed to function correctly with interlaced media. If
+you wish to change the frame rate of interlaced media then you are required
+to deinterlace before this filter and re-interlace after this filter.
+
+A description of the accepted options follows.
+
+ at table @option
+ at item fps
+Specify the output frames per second. This option can also be specified
+as a value alone. The default is @code{50}.
+
+ at item interp_start
+Specify the start of a range where the output frame will be created as a
+linear interpolation of two frames. The range is [@code{0}- at code{255}],
+the default is @code{15}.
+
+ at item interp_end
+Specify the end of a range where the output frame will be created as a
+linear interpolation of two frames. The range is [@code{0}- at code{255}],
+the default is @code{240}.
+
+ at item scene
+Specify the level at which a scene change is detected as a value between
+0 and 100 to indicate a new scene; a low value reflects a low
+probability for the current frame to introduce a new scene, while a higher
+value means the current frame is more likely to be one.
+The default is @code{7}.
+
+ at item flags
+Specify flags influencing the filter process.
+
+Available value for @var{flags} is:
+
+ at table @option
+ at item scene_change_detect, scd
+Enable scene change detection using the value of the option @var{scene}.
+This flag is enabled by default.
+ at end table
+ at end table
+
@section framestep
Select one frame every N-th frame.
diff --git a/libavfilter/Makefile b/libavfilter/Makefile
index bec7bdb..0bbd8e6 100644
--- a/libavfilter/Makefile
+++ b/libavfilter/Makefile
@@ -140,6 +140,7 @@ OBJS-$(CONFIG_FORMAT_FILTER) += vf_format.o
OBJS-$(CONFIG_FRAMESTEP_FILTER) += vf_framestep.o
OBJS-$(CONFIG_FPS_FILTER) += vf_fps.o
OBJS-$(CONFIG_FRAMEPACK_FILTER) += vf_framepack.o
+OBJS-$(CONFIG_FRAMERATE_FILTER) += vf_framerate.o
OBJS-$(CONFIG_FREI0R_FILTER) += vf_frei0r.o
OBJS-$(CONFIG_FSPP_FILTER) += vf_fspp.o
OBJS-$(CONFIG_GEQ_FILTER) += vf_geq.o
diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c
index ad7242d..e47650c 100644
--- a/libavfilter/allfilters.c
+++ b/libavfilter/allfilters.c
@@ -155,6 +155,7 @@ void avfilter_register_all(void)
REGISTER_FILTER(FORMAT, format, vf);
REGISTER_FILTER(FPS, fps, vf);
REGISTER_FILTER(FRAMEPACK, framepack, vf);
+ REGISTER_FILTER(FRAMERATE, framerate, vf);
REGISTER_FILTER(FRAMESTEP, framestep, vf);
REGISTER_FILTER(FREI0R, frei0r, vf);
REGISTER_FILTER(FSPP, fspp, vf);
diff --git a/libavfilter/vf_framerate.c b/libavfilter/vf_framerate.c
new file mode 100644
index 0000000..30d79e6
--- /dev/null
+++ b/libavfilter/vf_framerate.c
@@ -0,0 +1,632 @@
+/*
+ * Copyright (C) 2012 Mark Himsley
+ *
+ * get_scene_score() Copyright (c) 2011 Stefano Sabatini
+ * taken from ffmpeg/libavfilter/vf_select.c
+ *
+ * This filter is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This filter is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file
+ * filter for upsampling or downsampling a progressive source
+ */
+
+#define DEBUG
+
+#include "libavutil/avassert.h"
+#include "libavutil/common.h"
+#include "libavutil/imgutils.h"
+#include "libavutil/internal.h"
+#include "libavutil/opt.h"
+#include "libavutil/parseutils.h"
+#include "libavutil/pixdesc.h"
+#include "libavutil/pixelutils.h"
+
+#include "avfilter.h"
+#include "internal.h"
+#include "video.h"
+
+#define N_SRCE 3
+typedef struct {
+ const AVClass *class;
+ // parameters
+ AVRational dest_frame_rate; ///< output frames per second
+ int flags; ///< flags affecting frame rate conversion algorithm
+ double scene_score; ///< score that denotes a scene change has happened
+ int interp_start; ///< start of range to apply linear interpolation
+ int interp_end; ///< end of range to apply linear interpolation
+
+ int line_size[4]; ///< bytes of pixel data per line for each plane
+ int vsub;
+
+ int frst, next, prev, crnt, last;
+ int pending_srce_frames; ///< how many input frames are still waiting to be processed
+ int flush; ///< are we flushing final frames
+ int pending_end_frame; ///< flag indicating we are waiting to call end_frame()
+
+ AVRational srce_time_base; ///< timebase of source
+
+ AVRational dest_time_base; ///< timebase of destination
+ int32_t dest_frame_num;
+ int64_t last_dest_frame_pts; ///< pts of the last frame output
+ int average_srce_pts_dest_delta; ///< average input pts delta converted from input rate to output rate
+ int average_dest_pts_delta; ///< calculated average output pts delta
+
+ av_pixelutils_sad_fn sad; ///< Sum of the absolute difference function (scene detect only)
+ double prev_mafd; ///< previous MAFD (scene detect only)
+
+ AVFrame *srce[N_SRCE]; ///< buffered source frames
+ int64_t srce_pts_dest[N_SRCE]; ///< pts for source frames scaled to output timebase
+ AVFrame *work; ///< frame we are working on
+} FrameRateContext;
+
+#define OFFSET(x) offsetof(FrameRateContext, x)
+#define V AV_OPT_FLAG_VIDEO_PARAM
+#define F AV_OPT_FLAG_FILTERING_PARAM
+#define FRAMERATE_FLAG_SCD 01
+
+static const AVOption framerate_options[] = {
+ {"fps", "required output frames per second rate", OFFSET(dest_frame_rate), AV_OPT_TYPE_VIDEO_RATE, {.str="50"}, 0, INT_MAX, V|F },
+
+ {"interp_start", "point to start linear interpolation", OFFSET(interp_start), AV_OPT_TYPE_INT, {.i64=15}, 0, 255, V|F },
+ {"interp_end", "point to end linear interpolation", OFFSET(interp_end), AV_OPT_TYPE_INT, {.i64=240}, 0, 255, V|F },
+ {"scene", "scene change level", OFFSET(scene_score), AV_OPT_TYPE_DOUBLE, {.dbl=7.0}, 0, INT_MAX, V|F },
+
+ {"flags", "set flags", OFFSET(flags), AV_OPT_TYPE_FLAGS, {.i64=1}, 0, INT_MAX, V|F, "flags" },
+ {"scene_change_detect", "enable scene change detection", 0, AV_OPT_TYPE_CONST, {.i64=FRAMERATE_FLAG_SCD}, INT_MIN, INT_MAX, V|F, "flags" },
+ {"scd", "enable scene change detection", 0, AV_OPT_TYPE_CONST, {.i64=FRAMERATE_FLAG_SCD}, INT_MIN, INT_MAX, V|F, "flags" },
+
+ {NULL}
+};
+
+AVFILTER_DEFINE_CLASS(framerate);
+
+static void next_source(AVFilterContext *ctx)
+{
+ FrameRateContext *s = ctx->priv;
+
+ av_dlog(ctx, "next_source()\n");
+
+ if (s->srce[s->last] && s->srce[s->last] != s->srce[s->last-1]) {
+ av_dlog(ctx, "next_source() unlink %d\n", s->last);
+ av_frame_free(&s->srce[s->last]);
+ }
+ for (int i = s->last; i > s->frst; i--) {
+ av_dlog(ctx, "next_source() copy %d to %d\n", i - 1, i);
+ s->srce[i] = s->srce[i - 1];
+ }
+ av_dlog(ctx, "next_source() make %d null\n", s->frst);
+ s->srce[s->frst] = NULL;
+}
+
+static double get_scene_score(AVFilterContext *ctx, AVFrame *crnt, AVFrame *next)
+{
+ FrameRateContext *s = ctx->priv;
+
+ double ret = 0;
+
+ av_dlog(ctx, "get_scene_score()\n");
+
+ if (crnt &&
+ crnt->height == next->height &&
+ crnt->width == next->width) {
+ int x, y;
+ int64_t sad;
+ double mafd, diff;
+ uint8_t *p1 = crnt->data[0];
+ uint8_t *p2 = next->data[0];
+ const int p1_linesize = crnt->linesize[0];
+ const int p2_linesize = next->linesize[0];
+
+ av_dlog(ctx, "get_scene_score() process\n");
+
+ for (sad = y = 0; y < crnt->height; y += 8) {
+ for (x = 0; x < p1_linesize; x += 8) {
+ sad += s->sad(p1 + y * p1_linesize + x,
+ p1_linesize,
+ p2 + y * p2_linesize + x,
+ p2_linesize);
+ }
+ }
+ emms_c();
+ mafd = sad / (crnt->height * crnt->width * 3);
+ diff = fabs(mafd - s->prev_mafd);
+ ret = av_clipf(FFMIN(mafd, diff), 0, 100.0);
+ s->prev_mafd = mafd;
+ }
+ av_dlog(ctx, "get_scene_score() result is:%f\n", ret);
+ return ret;
+}
+
+static int process_work_frame(AVFilterContext *ctx)
+{
+ FrameRateContext *s = ctx->priv;
+ int64_t work_next_pts;
+ AVFrame *copy_src1, *copy_src2;
+ int interpolate;
+
+ av_dlog(ctx, "process_work_frame()\n");
+
+ av_dlog(ctx, "process_work_frame() pending_input_frames %d\n", s->pending_srce_frames);
+
+ if (s->srce[s->prev]) av_dlog(ctx, "process_work_frame() srce prev pts:%"PRId64"\n", s->srce[s->prev]->pts);
+ if (s->srce[s->crnt]) av_dlog(ctx, "process_work_frame() srce crnt pts:%"PRId64"\n", s->srce[s->crnt]->pts);
+ if (s->srce[s->next]) av_dlog(ctx, "process_work_frame() srce next pts:%"PRId64"\n", s->srce[s->next]->pts);
+
+ if (!s->srce[s->crnt]) {
+ // the filter cannot do anything
+ av_dlog(ctx, "process_work_frame() no current frame cached: move on to next frame, do not output a frame\n");
+ next_source(ctx);
+ return 0;
+ }
+
+ av_assert0(s->work);
+
+ work_next_pts = s->work->pts + s->average_dest_pts_delta;
+
+ av_dlog(ctx, "process_work_frame() work crnt pts:%"PRId64"\n", s->work->pts);
+ av_dlog(ctx, "process_work_frame() work next pts:%"PRId64"\n", work_next_pts);
+ if (s->srce[s->prev])
+ av_dlog(ctx, "process_work_frame() srce prev pts:%"PRId64" at dest time base:%u/%u\n",
+ s->srce_pts_dest[s->prev], s->dest_time_base.num, s->dest_time_base.den);
+ if (s->srce[s->crnt])
+ av_dlog(ctx, "process_work_frame() srce crnt pts:%"PRId64" at dest time base:%u/%u\n",
+ s->srce_pts_dest[s->crnt], s->dest_time_base.num, s->dest_time_base.den);
+ if (s->srce[s->next])
+ av_dlog(ctx, "process_work_frame() srce next pts:%"PRId64" at dest time base:%u/%u\n",
+ s->srce_pts_dest[s->next], s->dest_time_base.num, s->dest_time_base.den);
+
+ av_assert0(s->srce[s->next]);
+
+ // should filter be skipping input frame (output frame rate is lower than input frame rate)
+ if (!s->flush && s->work->pts >= s->srce_pts_dest[s->next]) {
+ av_dlog(ctx, "process_work_frame() work crnt pts >= srce next pts: SKIP FRAME, move on to next frame, do not output a frame\n");
+ next_source(ctx);
+ s->pending_srce_frames--;
+ return 0;
+ }
+
+ // calculate interpolation
+ interpolate = (int) ((s->work->pts - s->srce_pts_dest[s->crnt]) * 256 / s->average_srce_pts_dest_delta);
+ av_dlog(ctx, "process_work_frame() interpolate:%d/256\n", interpolate);
+ copy_src1 = s->srce[s->crnt];
+ if (interpolate > s->interp_end) {
+ av_dlog(ctx, "process_work_frame() source is:NEXT\n");
+ copy_src1 = s->srce[s->next];
+ }
+ if (s->srce[s->prev] && interpolate < -s->interp_end) {
+ av_dlog(ctx, "process_work_frame() source is:PREV\n");
+ copy_src1 = s->srce[s->prev];
+ }
+
+ // decide whether to blend two frames
+ if ((interpolate >= s->interp_start && interpolate <= s->interp_end) || (interpolate <= -s->interp_start && interpolate >= -s->interp_end)) {
+ double interpolate_scene_score = 0;
+
+ if (interpolate > 0) {
+ av_dlog(ctx, "process_work_frame() interpolate source is:NEXT\n");
+ copy_src2 = s->srce[s->next];
+ } else {
+ av_dlog(ctx, "process_work_frame() interpolate source is:PREV\n");
+ copy_src2 = s->srce[s->prev];
+ }
+ if ((s->flags & FRAMERATE_FLAG_SCD) && copy_src2) {
+ interpolate_scene_score = get_scene_score(ctx, copy_src1, copy_src2);
+ av_dlog(ctx, "process_work_frame() interpolate scene score:%f\n", interpolate_scene_score);
+ }
+ // decide if the shot-change detection allows us to blend two frames
+ if (interpolate_scene_score < s->scene_score && copy_src2) {
+ uint16_t src2_factor = abs(interpolate);
+ uint16_t src1_factor = 256 - src2_factor;
+ av_dlog(ctx, "process_work_frame() INTERPOLATE to create work frame\n");
+ for (int plane = 0; plane < 4 && copy_src1->data[plane] && copy_src2->data[plane]; plane++) {
+ int cpy_line_width = s->line_size[plane];
+ uint8_t *cpy_src1_data = copy_src1->data[plane];
+ int cpy_src1_line_size = copy_src1->linesize[plane];
+ uint8_t *cpy_src2_data = copy_src2->data[plane];
+ int cpy_src2_line_size = copy_src2->linesize[plane];
+ int cpy_src_h = (plane > 0 && plane < 3) ? (copy_src1->height >> s->vsub) : (copy_src1->height);
+ uint8_t *cpy_dst_data = s->work->data[plane];
+ int cpy_dst_line_size = s->work->linesize[plane];
+ if (plane <1 || plane >2) {
+ // luma or alpha
+ for (int line = 0; line < cpy_src_h; line++) {
+ for (int pixel = 0; pixel < cpy_line_width; pixel++) {
+ // integer version of (src1 * src1_factor) + (src2 + src2_factor) + 0.5
+ // 0.5 is for rounding
+ // 128 is the integer representation of 0.5 << 8
+ cpy_dst_data[pixel] = ((cpy_src1_data[pixel] * src1_factor) + (cpy_src2_data[pixel] * src2_factor) + 128) >> 8;
+ }
+ cpy_src1_data += cpy_src1_line_size;
+ cpy_src2_data += cpy_src2_line_size;
+ cpy_dst_data += cpy_dst_line_size;
+ }
+ } else {
+ // chroma
+ for (int line = 0; line < cpy_src_h; line++) {
+ for (int pixel = 0; pixel < cpy_line_width; pixel++) {
+ // as above
+ // because U and V are based around 128 we have to subtract 128 from the components.
+ // 32896 is the integer representation of 128.5 << 8
+ cpy_dst_data[pixel] = (((cpy_src1_data[pixel] - 128) * src1_factor) + ((cpy_src2_data[pixel] - 128) * src2_factor) + 32896) >> 8;
+ }
+ cpy_src1_data += cpy_src1_line_size;
+ cpy_src2_data += cpy_src2_line_size;
+ cpy_dst_data += cpy_dst_line_size;
+ }
+ }
+ }
+ goto copy_done;
+ }
+ else {
+ av_dlog(ctx, "process_work_frame() CUT - DON'T INTERPOLATE\n");
+ }
+ }
+
+ av_dlog(ctx, "process_work_frame() COPY to the work frame\n");
+ // copy the frame we decided is our base source
+ for (int plane = 0; plane < 4 && copy_src1->data[plane]; plane++) {
+ int cpy_line_width = s->line_size[plane];
+ uint8_t *cpy_src1_data = copy_src1->data[plane];
+ int cpy_src1_line_size = copy_src1->linesize[plane];
+ int cpy_src_h = (plane > 0 && plane < 3) ? (copy_src1->height >> s->vsub) : (copy_src1->height);
+ uint8_t *cpy_dst_data = s->work->data[plane];
+ int cpy_dst_line_size = s->work->linesize[plane];
+ for (int line = 0; line < cpy_src_h; line++) {
+ memcpy(cpy_dst_data, cpy_src1_data, cpy_line_width);
+ cpy_src1_data += cpy_src1_line_size;
+ cpy_dst_data += cpy_dst_line_size;
+ }
+ }
+
+copy_done:
+ // should filter be re-using input frame (output frame rate is higher than input frame rate)
+ if (!s->flush && (work_next_pts + s->average_dest_pts_delta) < (s->srce_pts_dest[s->crnt] + s->average_srce_pts_dest_delta)) {
+ av_dlog(ctx, "process_work_frame() REPEAT FRAME\n");
+ } else {
+ av_dlog(ctx, "process_work_frame() CONSUME FRAME, move to next frame\n");
+ s->pending_srce_frames--;
+ next_source(ctx);
+ }
+ av_dlog(ctx, "process_work_frame() output a frame\n");
+ return 1;
+}
+
+static void set_srce_frame_dest_pts(AVFilterContext *ctx)
+{
+ FrameRateContext *s = ctx->priv;
+
+ av_dlog(ctx, "set_srce_frame_output_pts()\n");
+
+ // scale the input pts from the timebase difference between input and output
+ if (s->srce[s->prev])
+ s->srce_pts_dest[s->prev] = av_rescale_q(s->srce[s->prev]->pts, s->srce_time_base, s->dest_time_base);
+ if (s->srce[s->crnt])
+ s->srce_pts_dest[s->crnt] = av_rescale_q(s->srce[s->crnt]->pts, s->srce_time_base, s->dest_time_base);
+ if (s->srce[s->next])
+ s->srce_pts_dest[s->next] = av_rescale_q(s->srce[s->next]->pts, s->srce_time_base, s->dest_time_base);
+}
+
+static void set_work_frame_pts(AVFilterContext *ctx)
+{
+ FrameRateContext *s = ctx->priv;
+ int pts, average_srce_pts_delta = 0;
+
+ av_dlog(ctx, "set_work_frame_pts()\n");
+
+
+ av_assert0(s->srce[s->next]);
+ av_assert0(s->srce[s->crnt]);
+
+ av_dlog(ctx, "set_work_frame_pts() srce crnt pts:%"PRId64"\n", s->srce[s->crnt]->pts);
+ av_dlog(ctx, "set_work_frame_pts() srce next pts:%"PRId64"\n", s->srce[s->next]->pts);
+ if (s->srce[s->prev])
+ av_dlog(ctx, "set_work_frame_pts() srce prev pts:%"PRId64"\n", s->srce[s->prev]->pts);
+
+ average_srce_pts_delta = s->average_srce_pts_dest_delta;
+ av_dlog(ctx, "set_work_frame_pts() initial average srce pts:%d\n", average_srce_pts_delta);
+
+ // calculate the PTS delta
+ if ((pts = (s->srce[s->next]->pts - s->srce[s->crnt]->pts))) {
+ average_srce_pts_delta = average_srce_pts_delta?((average_srce_pts_delta+pts)>>1):pts;
+ } else if (s->srce[s->prev] && (pts = (s->srce[s->crnt]->pts - s->srce[s->prev]->pts))) {
+ average_srce_pts_delta = average_srce_pts_delta?((average_srce_pts_delta+pts)>>1):pts;
+ }
+
+ s->average_srce_pts_dest_delta = av_rescale_q(average_srce_pts_delta, s->srce_time_base, s->dest_time_base);
+ av_dlog(ctx, "set_work_frame_pts() average srce pts:%d\n", average_srce_pts_delta);
+ av_dlog(ctx, "set_work_frame_pts() average srce pts:%d at dest time base:%u/%u\n",
+ s->average_srce_pts_dest_delta, s->dest_time_base.num, s->dest_time_base.den);
+
+ set_srce_frame_dest_pts(ctx);
+
+ if (ctx->inputs[0] && !s->average_dest_pts_delta) {
+ // TODO does this overflow / underflow / lose precision
+ // TODO why would this ever change?
+
+// s->average_dest_pts_delta =
+// ctx->inputs[0]->time_base.den / ctx->inputs[0]->time_base.num *
+// s->dest_frame_rate.den / s->dest_frame_rate.num;
+
+ s->average_dest_pts_delta = av_rescale_q(
+ ctx->inputs[0]->time_base.den / ctx->inputs[0]->time_base.num *
+ s->dest_frame_rate.den / s->dest_frame_rate.num,
+ s->srce_time_base, s->dest_time_base);
+
+ av_dlog(ctx, "set_frame_pts() average output pts from input timebase\n");
+ av_dlog(ctx, "set_work_frame_pts() average dest pts:%d\n", s->average_dest_pts_delta);
+ }
+// else {
+// s->average_output_pts_delta = s->average_input_pts_delta
+// * s->input_frame_rate.num / s->input_frame_rate.den
+// * s->output_frame_rate.den / s->output_frame_rate.num;
+// av_dlog(ctx, "set_frame_pts() average output pts from source pts\n");
+// }
+
+
+ if (!s->dest_frame_num) {
+ s->work->pts = s->last_dest_frame_pts = s->srce_pts_dest[s->crnt];
+ } else {
+ s->work->pts = s->last_dest_frame_pts + s->average_dest_pts_delta;
+ }
+
+ av_dlog(ctx, "set_work_frame_pts() calculated pts:%"PRId64" at dest time base:%u/%u\n",
+ s->work->pts, s->dest_time_base.num, s->dest_time_base.den);
+}
+
+static av_cold int init(AVFilterContext *ctx)
+{
+ FrameRateContext *s = ctx->priv;
+
+ s->dest_frame_num = 0;
+
+ s->crnt = (N_SRCE)>>1;
+ s->last = N_SRCE - 1;
+
+ s->next = s->crnt - 1;
+ s->prev = s->crnt + 1;
+
+ return 0;
+}
+
+static av_cold void uninit(AVFilterContext *ctx)
+{
+ FrameRateContext *s = ctx->priv;
+ int i;
+
+ for (i = s->frst + 1; i > s->last; i++) {
+ if (s->srce[i] && (s->srce[i] != s->srce[i + 1]))
+ av_frame_free(&s->srce[i]);
+ }
+ av_frame_free(&s->srce[s->last]);
+}
+
+static int query_formats(AVFilterContext *ctx)
+{
+ static const enum PixelFormat pix_fmts[] = {
+ PIX_FMT_YUV410P,
+ PIX_FMT_YUV411P,
+ PIX_FMT_YUV420P,
+ PIX_FMT_YUV422P,
+ PIX_FMT_YUV440P,
+ PIX_FMT_YUV444P,
+ PIX_FMT_NONE
+ };
+
+ AVFilterFormats *fmts_list = ff_make_format_list(pix_fmts);
+ if (!fmts_list)
+ return AVERROR(ENOMEM);
+ return ff_set_common_formats(ctx, fmts_list);
+}
+
+static int config_input(AVFilterLink *inlink)
+{
+ AVFilterContext *ctx = inlink->dst;
+ FrameRateContext *s = ctx->priv;
+ const AVPixFmtDescriptor *pix_desc = av_pix_fmt_desc_get(inlink->format);
+ int plane;
+
+ /** full an array with the number of bytes that the video
+ * data occupies per line for each plane of the input video */
+ for (plane = 0; plane < 4; plane++) {
+ s->line_size[plane] = av_image_get_linesize(
+ inlink->format,
+ inlink->w,
+ plane);
+ }
+
+ s->vsub = pix_desc->log2_chroma_h;
+
+ s->sad = av_pixelutils_get_sad_fn(3, 3, 2, s); // 8x8 both sources aligned
+ if (!s->sad)
+ return AVERROR(EINVAL);
+
+ s->srce_time_base = inlink->time_base;
+
+ return 0;
+}
+
+static int filter_frame(AVFilterLink *inlink, AVFrame *inpicref)
+{
+ AVFilterContext *ctx = inlink->dst;
+ FrameRateContext *s = ctx->priv;
+ AVFilterLink *outlink = ctx->outputs[0];
+
+ // we have one new frame
+ s->pending_srce_frames++;
+
+ if (inpicref->interlaced_frame)
+ av_log(ctx, AV_LOG_WARNING, "Interlaced frame found - the output will not be correct\n");
+
+ // store the pointer to the new frame
+ av_frame_free(&s->srce[s->frst]);
+ s->srce[s->frst] = inpicref;
+
+ if (!s->pending_end_frame && s->srce[s->crnt]) {
+ s->work = ff_get_video_buffer(outlink, outlink->w, outlink->h);
+ av_frame_copy_props(s->work, s->srce[s->crnt]);
+ set_work_frame_pts(ctx);
+
+ s->pending_end_frame = 1;
+ } else {
+ set_srce_frame_dest_pts(ctx);
+ }
+
+// if (!s->srce[s->crnt]) {
+// av_dlog(ctx, "end_frame() no current frame\n");
+// return;
+// }
+
+ if (process_work_frame(ctx)) {
+ ff_filter_frame(outlink, s->work);
+ s->dest_frame_num++;
+ s->last_dest_frame_pts = s->work->pts;
+
+ s->pending_end_frame = 0;
+ }
+
+ return 0;
+}
+
+static int config_output(AVFilterLink *outlink)
+{
+ AVFilterContext *ctx = outlink->src;
+ FrameRateContext *s = ctx->priv;
+ int exact;
+
+ av_dlog(ctx, "config_output()\n");
+
+ av_dlog(ctx,
+ "config_output() input time base:%u/%u (%f)\n",
+ ctx->inputs[0]->time_base.num,ctx->inputs[0]->time_base.den,
+ av_q2d(ctx->inputs[0]->time_base));
+
+ // make sure timebase is small enough to hold the framerate
+
+ exact = av_reduce(&s->dest_time_base.num, &s->dest_time_base.den,
+ av_gcd((int64_t)s->srce_time_base.num * s->dest_frame_rate.num,
+ (int64_t)s->srce_time_base.den * s->dest_frame_rate.den ),
+ (int64_t)s->srce_time_base.den * s->dest_frame_rate.num, INT_MAX);
+
+ av_log(ctx, AV_LOG_INFO,
+ "time base:%u/%u -> %u/%u exact:%d\n",
+ s->srce_time_base.num, s->srce_time_base.den,
+ s->dest_time_base.num, s->dest_time_base.den, exact);
+ if (!exact) {
+ av_log(ctx, AV_LOG_WARNING, "Timebase conversion is not exact\n");
+ }
+
+ outlink->frame_rate = s->dest_frame_rate;
+ outlink->time_base = s->dest_time_base;
+ outlink->flags |= FF_LINK_FLAG_REQUEST_LOOP;
+
+ av_dlog(ctx,
+ "config_output() output time base:%u/%u (%f) w:%d h:%d\n",
+ outlink->time_base.num, outlink->time_base.den,
+ av_q2d(outlink->time_base),
+ outlink->w, outlink->h);
+
+
+ av_log(ctx, AV_LOG_INFO, "fps -> fps:%u/%u scene score:%f interpolate start:%d end:%d\n",
+ s->dest_frame_rate.num, s->dest_frame_rate.den,
+ s->scene_score, s->interp_start, s->interp_end);
+
+ return 0;
+}
+
+static int request_frame(AVFilterLink *outlink)
+{
+ AVFilterContext *ctx = outlink->src;
+ FrameRateContext *s = ctx->priv;
+ int val, i, ret = 0;
+
+ av_dlog(ctx, "request_frame()\n");
+
+ // if there is no "next" frame AND we are not in flush then get one from our input filter
+ if (!s->srce[s->frst] && !s->flush) {
+ av_dlog(ctx, "request_frame() call source's request_frame()\n");
+ if ((val = ff_request_frame(outlink->src->inputs[0])) < 0) {
+ av_dlog(ctx, "request_frame() source's request_frame() returned error:%d\n", val);
+ return val;
+ }
+ av_dlog(ctx, "request_frame() source's request_frame() returned:%d\n", val);
+ return 0;
+ }
+
+ av_dlog(ctx, "request_frame() REPEAT or FLUSH\n");
+
+ if (s->pending_srce_frames <= 0) {
+ av_dlog(ctx, "request_frame() nothing else to do, return:EOF\n");
+ return AVERROR(AVERROR_EOF);
+ }
+
+ // otherwise, make brand-new frame and pass to our output filter
+ av_dlog(ctx, "request_frame() FLUSH\n");
+
+ // back fill at end of file when source has no more frames
+ for (i = s->last; i > s->frst; i--) {
+ if (!s->srce[i - 1] && s->srce[i]) {
+ av_dlog(ctx, "request_frame() copy:%d to:%d\n", i, i - 1);
+ s->srce[i - 1] = s->srce[i];
+ }
+ }
+
+ // get work-space for output frame
+ s->work = ff_get_video_buffer(outlink, outlink->w, outlink->h);
+ av_frame_copy_props(s->work, s->srce[s->crnt]);
+ set_work_frame_pts(ctx);
+
+ if (process_work_frame(ctx)) {
+ av_dlog(ctx, "request_frame() we are outputing a frame\n");
+ ret = ff_filter_frame(outlink, s->work);
+ s->dest_frame_num++;
+ s->last_dest_frame_pts = s->work->pts;
+
+ }
+ return ret;
+}
+
+static const AVFilterPad framerate_inputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .config_props = config_input,
+ .filter_frame = filter_frame,
+ },
+ { NULL }
+};
+
+static const AVFilterPad framerate_outputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .request_frame = request_frame,
+ .config_props = config_output,
+ },
+ { NULL }
+};
+
+AVFilter ff_vf_framerate = {
+ .name = "framerate",
+ .description = NULL_IF_CONFIG_SMALL("Upsamples or downsamples progressive source between specified frame rates"),
+ .priv_size = sizeof(FrameRateContext),
+ .priv_class = &framerate_class,
+ .init = init,
+ .uninit = uninit,
+ .query_formats = query_formats,
+ .inputs = framerate_inputs,
+ .outputs = framerate_outputs,
+};
--
1.7.11.2
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