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FFmpeg/libavcodec/bsf/packetsync.c
James Almer f2b3888754 avcodec/bsf: add an LCEVC stream merging bsf 
Signed-off-by: James Almer <jamrial@gmail.com>
2026-07-06 13:27:25 -03:00

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/*
* 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
*/
/**
* @file
* Packet sync API. Heavily based on libavfilter/framesync.c by Nicolas George
*/
#include "libavutil/avassert.h"
#include "libavutil/mem.h"
#include "libavutil/opt.h"
#include "libavcodec/bsf.h"
#include "filters.h"
#include "packetsync.h"
#define OFFSET(member) offsetof(FFPacketSync, member)
#define FLAGS (AV_OPT_FLAG_BSF_PARAM|AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_VIDEO_PARAM)
static const char *packetsync_name(void *ptr)
{
return "packetsync";
}
static const AVOption packetsync_options[] = {
{ "eof_action", "Action to take when encountering EOF from secondary input ",
OFFSET(opt_eof_action), AV_OPT_TYPE_INT, { .i64 = EOF_ACTION_PASS },
EOF_ACTION_ENDALL, EOF_ACTION_PASS, .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" },
{ "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", "Packet from secondary input with the nearest lower or equal timestamp to the primary input packet",
0, AV_OPT_TYPE_CONST, { .i64 = TS_DEFAULT }, .flags = FLAGS, .unit = "ts_sync_mode" },
{ "nearest", "Packet from secondary input with the absolute nearest timestamp to the primary input packet",
0, AV_OPT_TYPE_CONST, { .i64 = TS_NEAREST }, .flags = FLAGS, .unit = "ts_sync_mode" },
{ NULL }
};
const AVClass ff_packetsync_class = {
.version = LIBAVUTIL_VERSION_INT,
.class_name = "packetsync",
.item_name = packetsync_name,
.category = AV_CLASS_CATEGORY_BITSTREAM_FILTER,
.option = packetsync_options,
.parent_log_context_offset = OFFSET(parent),
};
const AVClass *ff_packetsync_child_class_iterate(void **iter)
{
const AVClass *c = *iter ? NULL : &ff_packetsync_class;
*iter = (void *)(uintptr_t)c;
return c;
}
enum {
STATE_BOF,
STATE_RUN,
STATE_EOF,
};
static int consume_from_fifos(FFPacketSync *fs);
void ff_packetsync_preinit(FFPacketSync *fs)
{
if (fs->class)
return;
fs->class = &ff_packetsync_class;
av_opt_set_defaults(fs);
}
int ff_packetsync_init(FFPacketSync *fs, AVBitStreamFilterContext *parent, unsigned nb_in)
{
/* For filters with several outputs, we will not be able to assume which
output is relevant for ff_outlink_packet_wanted() and
ff_bsf_link_set_in_status(). To be designed when needed. */
av_assert0(parent->nb_outputs == 1);
ff_packetsync_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 packetsync_eof(FFPacketSync *fs, int64_t pts)
{
fs->eof = 1;
fs->pkt_ready = 0;
ff_bsf_link_set_in_status(fs->parent->outputs[0], AVERROR_EOF, pts);
}
static void packetsync_sync_level_update(FFPacketSync *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
packetsync_eof(fs, eof_pts);
}
int ff_packetsync_configure(FFPacketSync *fs)
{
unsigned i;
for (i = 1; i < fs->nb_in; i++) {
fs->in[i].after = EXT_NULL;
fs->in[i].sync = 0;
}
if (fs->opt_eof_action == EOF_ACTION_ENDALL) {
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;
packetsync_sync_level_update(fs, AV_NOPTS_VALUE);
return 0;
}
static int packetsync_advance(FFPacketSync *fs)
{
unsigned i;
int64_t pts;
int ret;
while (!(fs->pkt_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) {
packetsync_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)) {
av_packet_free(&fs->in[i].pkt);
fs->in[i].pkt = fs->in[i].pkt_next;
fs->in[i].pts = fs->in[i].pts_next;
fs->in[i].pkt_next = NULL;
fs->in[i].pts_next = AV_NOPTS_VALUE;
fs->in[i].have_next = 0;
fs->in[i].state = fs->in[i].pkt ? STATE_RUN : STATE_EOF;
if (fs->in[i].sync == fs->sync_level && fs->in[i].pkt)
fs->pkt_ready = 1;
if (fs->in[i].state == STATE_EOF &&
fs->in[i].after == EXT_STOP)
packetsync_eof(fs, AV_NOPTS_VALUE);
}
}
if (fs->pkt_ready)
for (i = 0; i < fs->nb_in; i++)
if ((fs->in[i].state == STATE_BOF &&
fs->in[i].before == EXT_STOP))
fs->pkt_ready = 0;
fs->pts = pts;
}
return 0;
}
static int64_t packetsync_pts_extrapolate(FFPacketSync *fs, unsigned in,
int64_t pts)
{
return pts + 1;
}
static void packetsync_inject_packet(FFPacketSync *fs, unsigned in, AVPacket *pkt)
{
int64_t pts;
av_assert0(!fs->in[in].have_next);
av_assert0(pkt);
pts = av_rescale_q_rnd(pkt->pts, fs->in[in].time_base, fs->time_base, AV_ROUND_NEAR_INF | AV_ROUND_PASS_MINMAX);
pkt->pts = pts;
fs->in[in].pkt_next = pkt;
fs->in[in].pts_next = pts;
fs->in[in].have_next = 1;
}
static void packetsync_inject_status(FFPacketSync *fs, unsigned in, int status, int64_t eof_pts)
{
av_assert0(!fs->in[in].have_next);
fs->in[in].sync = 0;
packetsync_sync_level_update(fs, status == AVERROR_EOF ? eof_pts : AV_NOPTS_VALUE);
fs->in[in].pkt_next = NULL;
fs->in[in].pts_next = fs->in[in].state != STATE_RUN
? INT64_MAX : packetsync_pts_extrapolate(fs, in, fs->in[in].pts);
fs->in[in].have_next = 1;
}
int ff_packetsync_get_packet(FFPacketSync *fs, unsigned in, AVPacket **rpkt,
unsigned get)
{
AVPacket *pkt;
unsigned need_copy = 0, i;
int64_t pts_next;
if (!fs->in[in].pkt) {
*rpkt = NULL;
return 0;
}
pkt = fs->in[in].pkt;
if (get) {
/* Find out if we need to copy the packet: is there another sync
stream, and do we know if its current packet 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 (!(pkt = av_packet_clone(pkt)))
return AVERROR(ENOMEM);
} else {
fs->in[in].pkt = NULL;
}
fs->pkt_ready = 0;
}
*rpkt = pkt;
return 0;
}
void ff_packetsync_uninit(FFPacketSync *fs)
{
unsigned i;
for (i = 0; i < fs->nb_in; i++) {
av_packet_free(&fs->in[i].pkt);
av_packet_free(&fs->in[i].pkt_next);
}
av_freep(&fs->in);
}
static int consume_from_fifos(FFPacketSync *fs)
{
AVBitStreamFilterContext *ctx = fs->parent;
AVPacket *pkt = 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_bsf_inlink_consume_packet(ctx->inputs[i], &pkt);
if (ret < 0)
return ret;
if (ret) {
av_assert0(pkt);
packetsync_inject_packet(fs, i, pkt);
} else {
ret = ff_bsf_inlink_acknowledge_status(ctx->inputs[i], &status, &pts);
if (ret > 0) {
packetsync_inject_status(fs, i, status, pts);
} else if (!ret) {
nb_miss++;
}
}
}
if (nb_miss) {
if (nb_miss == nb_active && !ff_bsf_outlink_packet_wanted(ctx->outputs[0]))
return FFERROR_BSF_NOT_READY;
for (i = 0; i < fs->nb_in; i++)
if (!fs->in[i].have_next && fs->in[i].state != STATE_EOF)
ff_bsf_inlink_request_packet(ctx->inputs[i]);
return 0;
}
return 1;
}
int ff_packetsync_activate(FFPacketSync *fs)
{
AVBitStreamFilterContext *ctx = fs->parent;
int ret;
ret = ff_bsf_outlink_get_status(ctx->outputs[0]);
if (ret) {
unsigned i;
for (i = 0; i < ctx->nb_inputs; i++)
ff_bsf_inlink_set_status(ctx->inputs[i], ret);
return 0;
}
ret = packetsync_advance(fs);
if (ret < 0)
return ret;
if (fs->eof || !fs->pkt_ready)
return 0;
ret = fs->on_event(fs);
if (ret < 0)
return ret;
fs->pkt_ready = 0;
return 0;
}
int ff_packetsync_init_dualinput(FFPacketSync *fs, AVBitStreamFilterContext *parent)
{
int ret;
ret = ff_packetsync_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_STOP;
fs->in[1].sync = 1;
fs->in[1].before = EXT_NULL;
fs->in[1].after = EXT_NULL;
return 0;
}
int ff_packetsync_dualinput_get(FFPacketSync *fs, AVPacket **f0, AVPacket **f1)
{
AVBitStreamFilterContext *ctx = fs->parent;
AVPacket *mainpic = NULL, *secondpic = NULL;
int ret;
if ((ret = ff_packetsync_get_packet(fs, 0, &mainpic, 1)) < 0 ||
(ret = ff_packetsync_get_packet(fs, 1, &secondpic, 0)) < 0) {
av_packet_free(&mainpic);
return ret;
}
av_assert0(mainpic);
mainpic->pts = av_rescale_q(fs->pts, fs->time_base, ctx->outputs[0]->time_base);
*f0 = mainpic;
*f1 = secondpic;
return 0;
}
int ff_packetsync_dualinput_get_writable(FFPacketSync *fs, AVPacket **f0, AVPacket **f1)
{
int ret;
ret = ff_packetsync_dualinput_get(fs, f0, f1);
if (ret < 0)
return ret;
ret = av_packet_make_writable(*f0);
if (ret < 0) {
av_packet_free(f0);
*f1 = NULL;
return ret;
}
return 0;
}
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