337 lines
9.6 KiB
C
337 lines
9.6 KiB
C
/*
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* Copyright (c) 2013 Nicolas George
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public License
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* as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with FFmpeg; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libavutil/avassert.h"
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#include "avfilter.h"
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#include "bufferqueue.h"
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#include "framesync.h"
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#include "internal.h"
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#define OFFSET(member) offsetof(FFFrameSync, member)
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static const char *framesync_name(void *ptr)
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{
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return "framesync";
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}
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static const AVClass framesync_class = {
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.version = LIBAVUTIL_VERSION_INT,
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.class_name = "framesync",
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.item_name = framesync_name,
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.category = AV_CLASS_CATEGORY_FILTER,
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.option = NULL,
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.parent_log_context_offset = OFFSET(parent),
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};
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enum {
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STATE_BOF,
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STATE_RUN,
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STATE_EOF,
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};
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int ff_framesync_init(FFFrameSync *fs, void *parent, unsigned nb_in)
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{
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fs->class = &framesync_class;
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fs->parent = parent;
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fs->nb_in = nb_in;
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fs->in = av_calloc(nb_in, sizeof(*fs->in));
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if (!fs->in)
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return AVERROR(ENOMEM);
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return 0;
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}
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static void framesync_sync_level_update(FFFrameSync *fs)
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{
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unsigned i, level = 0;
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for (i = 0; i < fs->nb_in; i++)
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if (fs->in[i].state != STATE_EOF)
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level = FFMAX(level, fs->in[i].sync);
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av_assert0(level <= fs->sync_level);
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if (level < fs->sync_level)
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av_log(fs, AV_LOG_VERBOSE, "Sync level %u\n", level);
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if (level)
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fs->sync_level = level;
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else
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fs->eof = 1;
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}
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int ff_framesync_configure(FFFrameSync *fs)
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{
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unsigned i;
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int64_t gcd, lcm;
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if (!fs->time_base.num) {
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for (i = 0; i < fs->nb_in; i++) {
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if (fs->in[i].sync) {
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if (fs->time_base.num) {
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gcd = av_gcd(fs->time_base.den, fs->in[i].time_base.den);
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lcm = (fs->time_base.den / gcd) * fs->in[i].time_base.den;
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if (lcm < AV_TIME_BASE / 2) {
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fs->time_base.den = lcm;
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fs->time_base.num = av_gcd(fs->time_base.num,
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fs->in[i].time_base.num);
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} else {
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fs->time_base.num = 1;
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fs->time_base.den = AV_TIME_BASE;
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break;
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}
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} else {
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fs->time_base = fs->in[i].time_base;
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}
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}
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}
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if (!fs->time_base.num) {
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av_log(fs, AV_LOG_ERROR, "Impossible to set time base\n");
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return AVERROR(EINVAL);
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}
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av_log(fs, AV_LOG_VERBOSE, "Selected %d/%d time base\n",
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fs->time_base.num, fs->time_base.den);
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}
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for (i = 0; i < fs->nb_in; i++)
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fs->in[i].pts = fs->in[i].pts_next = AV_NOPTS_VALUE;
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fs->sync_level = UINT_MAX;
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framesync_sync_level_update(fs);
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return 0;
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}
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static void framesync_advance(FFFrameSync *fs)
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{
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int latest;
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unsigned i;
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int64_t pts;
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if (fs->eof)
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return;
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while (!fs->frame_ready) {
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latest = -1;
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for (i = 0; i < fs->nb_in; i++) {
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if (!fs->in[i].have_next) {
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if (latest < 0 || fs->in[i].pts < fs->in[latest].pts)
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latest = i;
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}
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}
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if (latest >= 0) {
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fs->in_request = latest;
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break;
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}
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pts = fs->in[0].pts_next;
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for (i = 1; i < fs->nb_in; i++)
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if (fs->in[i].pts_next < pts)
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pts = fs->in[i].pts_next;
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if (pts == INT64_MAX) {
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fs->eof = 1;
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break;
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}
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for (i = 0; i < fs->nb_in; i++) {
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if (fs->in[i].pts_next == pts ||
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(fs->in[i].before == EXT_INFINITY &&
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fs->in[i].state == STATE_BOF)) {
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av_frame_free(&fs->in[i].frame);
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fs->in[i].frame = fs->in[i].frame_next;
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fs->in[i].pts = fs->in[i].pts_next;
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fs->in[i].frame_next = NULL;
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fs->in[i].pts_next = AV_NOPTS_VALUE;
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fs->in[i].have_next = 0;
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fs->in[i].state = fs->in[i].frame ? STATE_RUN : STATE_EOF;
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if (fs->in[i].sync == fs->sync_level && fs->in[i].frame)
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fs->frame_ready = 1;
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if (fs->in[i].state == STATE_EOF &&
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fs->in[i].after == EXT_STOP)
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fs->eof = 1;
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}
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}
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if (fs->eof)
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fs->frame_ready = 0;
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if (fs->frame_ready)
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for (i = 0; i < fs->nb_in; i++)
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if ((fs->in[i].state == STATE_BOF &&
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fs->in[i].before == EXT_STOP))
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fs->frame_ready = 0;
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fs->pts = pts;
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}
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}
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static int64_t framesync_pts_extrapolate(FFFrameSync *fs, unsigned in,
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int64_t pts)
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{
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/* Possible enhancement: use the link's frame rate */
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return pts + 1;
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}
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static void framesync_inject_frame(FFFrameSync *fs, unsigned in, AVFrame *frame)
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{
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int64_t pts;
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av_assert0(!fs->in[in].have_next);
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if (frame) {
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pts = av_rescale_q(frame->pts, fs->in[in].time_base, fs->time_base);
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frame->pts = pts;
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} else {
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pts = fs->in[in].state != STATE_RUN || fs->in[in].after == EXT_INFINITY
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? INT64_MAX : framesync_pts_extrapolate(fs, in, fs->in[in].pts);
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fs->in[in].sync = 0;
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framesync_sync_level_update(fs);
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}
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fs->in[in].frame_next = frame;
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fs->in[in].pts_next = pts;
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fs->in[in].have_next = 1;
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}
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int ff_framesync_add_frame(FFFrameSync *fs, unsigned in, AVFrame *frame)
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{
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av_assert1(in < fs->nb_in);
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if (!fs->in[in].have_next)
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framesync_inject_frame(fs, in, frame);
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else
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ff_bufqueue_add(fs, &fs->in[in].queue, frame);
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return 0;
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}
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void ff_framesync_next(FFFrameSync *fs)
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{
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unsigned i;
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av_assert0(!fs->frame_ready);
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for (i = 0; i < fs->nb_in; i++)
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if (!fs->in[i].have_next && fs->in[i].queue.available)
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framesync_inject_frame(fs, i, ff_bufqueue_get(&fs->in[i].queue));
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fs->frame_ready = 0;
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framesync_advance(fs);
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}
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void ff_framesync_drop(FFFrameSync *fs)
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{
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fs->frame_ready = 0;
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}
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int ff_framesync_get_frame(FFFrameSync *fs, unsigned in, AVFrame **rframe,
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unsigned get)
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{
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AVFrame *frame;
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unsigned need_copy = 0, i;
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int64_t pts_next;
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int ret;
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if (!fs->in[in].frame) {
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*rframe = NULL;
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return 0;
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}
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frame = fs->in[in].frame;
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if (get) {
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/* Find out if we need to copy the frame: is there another sync
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stream, and do we know if its current frame will outlast this one? */
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pts_next = fs->in[in].have_next ? fs->in[in].pts_next : INT64_MAX;
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for (i = 0; i < fs->nb_in && !need_copy; i++)
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if (i != in && fs->in[i].sync &&
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(!fs->in[i].have_next || fs->in[i].pts_next < pts_next))
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need_copy = 1;
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if (need_copy) {
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if (!(frame = av_frame_clone(frame)))
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return AVERROR(ENOMEM);
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if ((ret = av_frame_make_writable(frame)) < 0) {
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av_frame_free(&frame);
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return ret;
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}
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} else {
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fs->in[in].frame = NULL;
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}
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fs->frame_ready = 0;
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}
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*rframe = frame;
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return 0;
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}
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void ff_framesync_uninit(FFFrameSync *fs)
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{
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unsigned i;
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for (i = 0; i < fs->nb_in; i++) {
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av_frame_free(&fs->in[i].frame);
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av_frame_free(&fs->in[i].frame_next);
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ff_bufqueue_discard_all(&fs->in[i].queue);
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}
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av_freep(&fs->in);
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}
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int ff_framesync_process_frame(FFFrameSync *fs, unsigned all)
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{
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int ret, count = 0;
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av_assert0(fs->on_event);
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while (1) {
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ff_framesync_next(fs);
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if (fs->eof || !fs->frame_ready)
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break;
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if ((ret = fs->on_event(fs)) < 0)
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return ret;
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ff_framesync_drop(fs);
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count++;
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if (!all)
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break;
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}
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if (!count && fs->eof)
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return AVERROR_EOF;
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return count;
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}
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int ff_framesync_filter_frame(FFFrameSync *fs, AVFilterLink *inlink,
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AVFrame *in)
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{
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int ret;
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if ((ret = ff_framesync_process_frame(fs, 1)) < 0)
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return ret;
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if ((ret = ff_framesync_add_frame(fs, FF_INLINK_IDX(inlink), in)) < 0)
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return ret;
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if ((ret = ff_framesync_process_frame(fs, 0)) < 0)
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return ret;
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return 0;
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}
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int ff_framesync_request_frame(FFFrameSync *fs, AVFilterLink *outlink)
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{
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AVFilterContext *ctx = outlink->src;
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int input, ret;
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if ((ret = ff_framesync_process_frame(fs, 0)) < 0)
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return ret;
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if (ret > 0)
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return 0;
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if (fs->eof)
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return AVERROR_EOF;
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outlink->flags |= FF_LINK_FLAG_REQUEST_LOOP;
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input = fs->in_request;
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ret = ff_request_frame(ctx->inputs[input]);
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if (ret == AVERROR_EOF) {
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if ((ret = ff_framesync_add_frame(fs, input, NULL)) < 0)
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return ret;
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if ((ret = ff_framesync_process_frame(fs, 0)) < 0)
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return ret;
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ret = 0;
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}
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return ret;
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}
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