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ffmpeg/libavfilter/framesync.c
Nicolas Gaullier de976eaf30 avfilter/framesync: fix forward EOF pts 
Note1: when the EOF pts is not accurate enough, the last frame
can be dropped by vf_fps with default rounding.

Note2: vf_scale use framesync since e82a3997cd,
so this is a very commonplace scenario.

For example:
./ffprobe -f lavfi testsrc=d=1,scale,fps -of flat \
  -count_frames -show_entries stream=nb_read_frames

Before:
streams.stream.0.nb_read_frames="24"

After:
streams.stream.0.nb_read_frames="25"

Signed-off-by: Anton Khirnov <anton@khirnov.net>
2024-10-13 13:54:03 +02:00

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/*
* Copyright (c) 2013 Nicolas George
*
* This file is part of FFmpeg.
*
* FFmpeg 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.
*
* FFmpeg 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 FFmpeg; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "libavutil/avassert.h"
#include "libavutil/mem.h"
#include "libavutil/opt.h"
#include "avfilter.h"
#include "filters.h"
#include "framesync.h"
#define OFFSET(member) offsetof(FFFrameSync, member)
#define FLAGS AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_FILTERING_PARAM
static const char *framesync_name(void *ptr)
{
return "framesync";
}
static const AVOption framesync_options[] = {
{ "eof_action", "Action to take when encountering EOF from secondary input ",
OFFSET(opt_eof_action), AV_OPT_TYPE_INT, { .i64 = EOF_ACTION_REPEAT },
EOF_ACTION_REPEAT, EOF_ACTION_PASS, .flags = FLAGS, .unit = "eof_action" },
{ "repeat", "Repeat the previous frame.", 0, AV_OPT_TYPE_CONST, { .i64 = EOF_ACTION_REPEAT }, .flags = FLAGS, .unit = "eof_action" },
{ "endall", "End both streams.", 0, AV_OPT_TYPE_CONST, { .i64 = EOF_ACTION_ENDALL }, .flags = FLAGS, .unit = "eof_action" },
{ "pass", "Pass through the main input.", 0, AV_OPT_TYPE_CONST, { .i64 = EOF_ACTION_PASS }, .flags = FLAGS, .unit = "eof_action" },
{ "shortest", "force termination when the shortest input terminates", OFFSET(opt_shortest), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, FLAGS },
{ "repeatlast", "extend last frame of secondary streams beyond EOF", OFFSET(opt_repeatlast), AV_OPT_TYPE_BOOL, { .i64 = 1 }, 0, 1, FLAGS },
{ "ts_sync_mode", "How strictly to sync streams based on secondary input timestamps",
OFFSET(opt_ts_sync_mode), AV_OPT_TYPE_INT, { .i64 = TS_DEFAULT },
TS_DEFAULT, TS_NEAREST, .flags = FLAGS, .unit = "ts_sync_mode" },
{ "default", "Frame from secondary input with the nearest lower or equal timestamp to the primary input frame",
0, AV_OPT_TYPE_CONST, { .i64 = TS_DEFAULT }, .flags = FLAGS, .unit = "ts_sync_mode" },
{ "nearest", "Frame from secondary input with the absolute nearest timestamp to the primary input frame",
0, AV_OPT_TYPE_CONST, { .i64 = TS_NEAREST }, .flags = FLAGS, .unit = "ts_sync_mode" },
{ NULL }
};
const AVClass ff_framesync_class = {
.version = LIBAVUTIL_VERSION_INT,
.class_name = "framesync",
.item_name = framesync_name,
.category = AV_CLASS_CATEGORY_FILTER,
.option = framesync_options,
.parent_log_context_offset = OFFSET(parent),
};
const AVClass *ff_framesync_child_class_iterate(void **iter)
{
const AVClass *c = *iter ? NULL : &ff_framesync_class;
*iter = (void *)(uintptr_t)c;
return c;
}
enum {
STATE_BOF,
STATE_RUN,
STATE_EOF,
};
static int consume_from_fifos(FFFrameSync *fs);
void ff_framesync_preinit(FFFrameSync *fs)
{
if (fs->class)
return;
fs->class = &ff_framesync_class;
av_opt_set_defaults(fs);
}
int ff_framesync_init(FFFrameSync *fs, AVFilterContext *parent, unsigned nb_in)
{
/* For filters with several outputs, we will not be able to assume which
output is relevant for ff_outlink_frame_wanted() and
ff_outlink_set_status(). To be designed when needed. */
av_assert0(parent->nb_outputs == 1);
ff_framesync_preinit(fs);
fs->parent = parent;
fs->nb_in = nb_in;
fs->in = av_calloc(nb_in, sizeof(*fs->in));
if (!fs->in) {
fs->nb_in = 0;
return AVERROR(ENOMEM);
}
return 0;
}
static void framesync_eof(FFFrameSync *fs, int64_t pts)
{
fs->eof = 1;
fs->frame_ready = 0;
ff_outlink_set_status(fs->parent->outputs[0], AVERROR_EOF, pts);
}
static void framesync_sync_level_update(FFFrameSync *fs, int64_t eof_pts)
{
unsigned i, level = 0;
for (i = 0; i < fs->nb_in; i++)
if (fs->in[i].state != STATE_EOF)
level = FFMAX(level, fs->in[i].sync);
av_assert0(level <= fs->sync_level);
if (level < fs->sync_level)
av_log(fs, AV_LOG_VERBOSE, "Sync level %u\n", level);
if (fs->opt_ts_sync_mode > TS_DEFAULT) {
for (i = 0; i < fs->nb_in; i++) {
if (fs->in[i].sync < level)
fs->in[i].ts_mode = fs->opt_ts_sync_mode;
else
fs->in[i].ts_mode = TS_DEFAULT;
}
}
if (level)
fs->sync_level = level;
else
framesync_eof(fs, eof_pts);
}
int ff_framesync_configure(FFFrameSync *fs)
{
unsigned i;
if (!fs->opt_repeatlast || fs->opt_eof_action == EOF_ACTION_PASS) {
fs->opt_repeatlast = 0;
fs->opt_eof_action = EOF_ACTION_PASS;
}
if (fs->opt_shortest || fs->opt_eof_action == EOF_ACTION_ENDALL) {
fs->opt_shortest = 1;
fs->opt_eof_action = EOF_ACTION_ENDALL;
}
if (!fs->opt_repeatlast) {
for (i = 1; i < fs->nb_in; i++) {
fs->in[i].after = EXT_NULL;
fs->in[i].sync = 0;
}
}
if (fs->opt_shortest) {
for (i = 0; i < fs->nb_in; i++)
fs->in[i].after = EXT_STOP;
}
if (!fs->time_base.num) {
for (i = 0; i < fs->nb_in; i++) {
if (fs->in[i].sync) {
if (fs->time_base.num) {
fs->time_base = av_gcd_q(fs->time_base, fs->in[i].time_base,
AV_TIME_BASE / 2, AV_TIME_BASE_Q);
} else {
fs->time_base = fs->in[i].time_base;
}
}
}
if (!fs->time_base.num) {
av_log(fs, AV_LOG_ERROR, "Impossible to set time base\n");
return AVERROR(EINVAL);
}
av_log(fs, AV_LOG_VERBOSE, "Selected %d/%d time base\n",
fs->time_base.num, fs->time_base.den);
}
for (i = 0; i < fs->nb_in; i++)
fs->in[i].pts = fs->in[i].pts_next = AV_NOPTS_VALUE;
fs->sync_level = UINT_MAX;
framesync_sync_level_update(fs, AV_NOPTS_VALUE);
return 0;
}
static int framesync_advance(FFFrameSync *fs)
{
unsigned i;
int64_t pts;
int ret;
while (!(fs->frame_ready || fs->eof)) {
ret = consume_from_fifos(fs);
if (ret <= 0)
return ret;
pts = INT64_MAX;
for (i = 0; i < fs->nb_in; i++)
if (fs->in[i].have_next && fs->in[i].pts_next < pts)
pts = fs->in[i].pts_next;
if (pts == INT64_MAX) {
framesync_eof(fs, AV_NOPTS_VALUE);
break;
}
for (i = 0; i < fs->nb_in; i++) {
if (fs->in[i].pts_next == pts ||
(fs->in[i].ts_mode == TS_NEAREST &&
fs->in[i].have_next &&
fs->in[i].pts_next != INT64_MAX && fs->in[i].pts != AV_NOPTS_VALUE &&
fs->in[i].pts_next - pts < pts - fs->in[i].pts) ||
(fs->in[i].before == EXT_INFINITY &&
fs->in[i].state == STATE_BOF)) {
av_frame_free(&fs->in[i].frame);
fs->in[i].frame = fs->in[i].frame_next;
fs->in[i].pts = fs->in[i].pts_next;
fs->in[i].frame_next = NULL;
fs->in[i].pts_next = AV_NOPTS_VALUE;
fs->in[i].have_next = 0;
fs->in[i].state = fs->in[i].frame ? STATE_RUN : STATE_EOF;
if (fs->in[i].sync == fs->sync_level && fs->in[i].frame)
fs->frame_ready = 1;
if (fs->in[i].state == STATE_EOF &&
fs->in[i].after == EXT_STOP)
framesync_eof(fs, AV_NOPTS_VALUE);
}
}
if (fs->frame_ready)
for (i = 0; i < fs->nb_in; i++)
if ((fs->in[i].state == STATE_BOF &&
fs->in[i].before == EXT_STOP))
fs->frame_ready = 0;
fs->pts = pts;
}
return 0;
}
static int64_t framesync_pts_extrapolate(FFFrameSync *fs, unsigned in,
int64_t pts)
{
/* Possible enhancement: use the link's frame rate */
return pts + 1;
}
static void framesync_inject_frame(FFFrameSync *fs, unsigned in, AVFrame *frame)
{
int64_t pts;
av_assert0(!fs->in[in].have_next);
av_assert0(frame);
pts = av_rescale_q(frame->pts, fs->in[in].time_base, fs->time_base);
frame->pts = pts;
fs->in[in].frame_next = frame;
fs->in[in].pts_next = pts;
fs->in[in].have_next = 1;
}
static void framesync_inject_status(FFFrameSync *fs, unsigned in, int status, int64_t eof_pts)
{
av_assert0(!fs->in[in].have_next);
fs->in[in].sync = 0;
framesync_sync_level_update(fs, status == AVERROR_EOF ? eof_pts : AV_NOPTS_VALUE);
fs->in[in].frame_next = NULL;
fs->in[in].pts_next = fs->in[in].state != STATE_RUN || fs->in[in].after == EXT_INFINITY
? INT64_MAX : framesync_pts_extrapolate(fs, in, fs->in[in].pts);
fs->in[in].have_next = 1;
}
int ff_framesync_get_frame(FFFrameSync *fs, unsigned in, AVFrame **rframe,
unsigned get)
{
AVFrame *frame;
unsigned need_copy = 0, i;
int64_t pts_next;
if (!fs->in[in].frame) {
*rframe = NULL;
return 0;
}
frame = fs->in[in].frame;
if (get) {
/* Find out if we need to copy the frame: is there another sync
stream, and do we know if its current frame will outlast this one? */
pts_next = fs->in[in].have_next ? fs->in[in].pts_next : INT64_MAX;
for (i = 0; i < fs->nb_in && !need_copy; i++)
if (i != in && fs->in[i].sync &&
(!fs->in[i].have_next || fs->in[i].pts_next < pts_next))
need_copy = 1;
if (need_copy) {
if (!(frame = av_frame_clone(frame)))
return AVERROR(ENOMEM);
} else {
fs->in[in].frame = NULL;
}
fs->frame_ready = 0;
}
*rframe = frame;
return 0;
}
void ff_framesync_uninit(FFFrameSync *fs)
{
unsigned i;
for (i = 0; i < fs->nb_in; i++) {
av_frame_free(&fs->in[i].frame);
av_frame_free(&fs->in[i].frame_next);
}
av_freep(&fs->in);
}
static int consume_from_fifos(FFFrameSync *fs)
{
AVFilterContext *ctx = fs->parent;
AVFrame *frame = NULL;
int64_t pts;
unsigned i, nb_active, nb_miss;
int ret, status;
nb_active = nb_miss = 0;
for (i = 0; i < fs->nb_in; i++) {
if (fs->in[i].have_next || fs->in[i].state == STATE_EOF)
continue;
nb_active++;
ret = ff_inlink_consume_frame(ctx->inputs[i], &frame);
if (ret < 0)
return ret;
if (ret) {
av_assert0(frame);
framesync_inject_frame(fs, i, frame);
} else {
ret = ff_inlink_acknowledge_status(ctx->inputs[i], &status, &pts);
if (ret > 0) {
framesync_inject_status(fs, i, status, pts);
} else if (!ret) {
nb_miss++;
}
}
}
if (nb_miss) {
if (nb_miss == nb_active && !ff_outlink_frame_wanted(ctx->outputs[0]))
return FFERROR_NOT_READY;
for (i = 0; i < fs->nb_in; i++)
if (!fs->in[i].have_next && fs->in[i].state != STATE_EOF)
ff_inlink_request_frame(ctx->inputs[i]);
return 0;
}
return 1;
}
int ff_framesync_activate(FFFrameSync *fs)
{
AVFilterContext *ctx = fs->parent;
int ret;
FF_FILTER_FORWARD_STATUS_BACK_ALL(ctx->outputs[0], ctx);
ret = framesync_advance(fs);
if (ret < 0)
return ret;
if (fs->eof || !fs->frame_ready)
return 0;
ret = fs->on_event(fs);
if (ret < 0)
return ret;
fs->frame_ready = 0;
return 0;
}
int ff_framesync_init_dualinput(FFFrameSync *fs, AVFilterContext *parent)
{
int ret;
ret = ff_framesync_init(fs, parent, 2);
if (ret < 0)
return ret;
fs->in[0].time_base = parent->inputs[0]->time_base;
fs->in[1].time_base = parent->inputs[1]->time_base;
fs->in[0].sync = 2;
fs->in[0].before = EXT_STOP;
fs->in[0].after = EXT_INFINITY;
fs->in[1].sync = 1;
fs->in[1].before = EXT_NULL;
fs->in[1].after = EXT_INFINITY;
return 0;
}
int ff_framesync_dualinput_get(FFFrameSync *fs, AVFrame **f0, AVFrame **f1)
{
AVFilterContext *ctx = fs->parent;
AVFrame *mainpic = NULL, *secondpic = NULL;
int ret;
if ((ret = ff_framesync_get_frame(fs, 0, &mainpic, 1)) < 0 ||
(ret = ff_framesync_get_frame(fs, 1, &secondpic, 0)) < 0) {
av_frame_free(&mainpic);
return ret;
}
av_assert0(mainpic);
mainpic->pts = av_rescale_q(fs->pts, fs->time_base, ctx->outputs[0]->time_base);
if (ctx->is_disabled)
secondpic = NULL;
*f0 = mainpic;
*f1 = secondpic;
return 0;
}
int ff_framesync_dualinput_get_writable(FFFrameSync *fs, AVFrame **f0, AVFrame **f1)
{
int ret;
ret = ff_framesync_dualinput_get(fs, f0, f1);
if (ret < 0)
return ret;
ret = ff_inlink_make_frame_writable(fs->parent->inputs[0], f0);
if (ret < 0) {
av_frame_free(f0);
*f1 = NULL;
return ret;
}
return 0;
}
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