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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
*/
#include "libavutil/common.h"
#include "libavutil/opt.h"
#include "bsf.h"
#include "cbs.h"
#include "cbs_bsf.h"
#include "cbs_av1.h"
typedef struct AV1MetadataContext {
CBSBSFContext common;
int td;
AV1RawOBU td_obu;
int color_primaries;
int transfer_characteristics;
int matrix_coefficients;
int color_range;
int chroma_sample_position;
AVRational tick_rate;
int num_ticks_per_picture;
int delete_padding;
} AV1MetadataContext;
static int av1_metadata_update_sequence_header(AVBSFContext *bsf,
AV1RawSequenceHeader *seq)
{
AV1MetadataContext *ctx = bsf->priv_data;
AV1RawColorConfig *clc = &seq->color_config;
AV1RawTimingInfo *tim = &seq->timing_info;
if (ctx->color_primaries >= 0 ||
ctx->transfer_characteristics >= 0 ||
ctx->matrix_coefficients >= 0) {
clc->color_description_present_flag = 1;
if (ctx->color_primaries >= 0)
clc->color_primaries = ctx->color_primaries;
if (ctx->transfer_characteristics >= 0)
clc->transfer_characteristics = ctx->transfer_characteristics;
if (ctx->matrix_coefficients >= 0)
clc->matrix_coefficients = ctx->matrix_coefficients;
}
if (ctx->color_range >= 0) {
if (clc->color_primaries == AVCOL_PRI_BT709 &&
clc->transfer_characteristics == AVCOL_TRC_IEC61966_2_1 &&
clc->matrix_coefficients == AVCOL_SPC_RGB) {
av_log(bsf, AV_LOG_WARNING, "Warning: color_range cannot be set "
"on RGB streams encoded in BT.709 sRGB.\n");
} else {
clc->color_range = ctx->color_range;
}
}
if (ctx->chroma_sample_position >= 0) {
if (clc->mono_chrome || !clc->subsampling_x || !clc->subsampling_y) {
av_log(bsf, AV_LOG_WARNING, "Warning: chroma_sample_position "
"can only be set for 4:2:0 streams.\n");
} else {
clc->chroma_sample_position = ctx->chroma_sample_position;
}
}
if (ctx->tick_rate.num && ctx->tick_rate.den) {
int num, den;
av_reduce(&num, &den, ctx->tick_rate.num, ctx->tick_rate.den,
UINT32_MAX > INT_MAX ? UINT32_MAX : INT_MAX);
tim->time_scale = num;
tim->num_units_in_display_tick = den;
seq->timing_info_present_flag = 1;
if (ctx->num_ticks_per_picture > 0) {
tim->equal_picture_interval = 1;
tim->num_ticks_per_picture_minus_1 =
ctx->num_ticks_per_picture - 1;
}
}
return 0;
}
static int av1_metadata_update_fragment(AVBSFContext *bsf, AVPacket *pkt,
CodedBitstreamFragment *frag)
{
AV1MetadataContext *ctx = bsf->priv_data;
int err, i;
for (i = 0; i < frag->nb_units; i++) {
if (frag->units[i].type == AV1_OBU_SEQUENCE_HEADER) {
AV1RawOBU *obu = frag->units[i].content;
err = av1_metadata_update_sequence_header(bsf, &obu->obu.sequence_header);
if (err < 0)
return err;
}
}
// If a Temporal Delimiter is present, it must be the first OBU.
if (frag->nb_units && frag->units[0].type == AV1_OBU_TEMPORAL_DELIMITER) {
if (ctx->td == BSF_ELEMENT_REMOVE)
ff_cbs_delete_unit(frag, 0);
} else if (pkt && ctx->td == BSF_ELEMENT_INSERT) {
err = ff_cbs_insert_unit_content(frag, 0, AV1_OBU_TEMPORAL_DELIMITER,
&ctx->td_obu, NULL);
if (err < 0) {
av_log(bsf, AV_LOG_ERROR, "Failed to insert Temporal Delimiter.\n");
return err;
}
}
if (ctx->delete_padding) {
for (i = frag->nb_units - 1; i >= 0; i--) {
if (frag->units[i].type == AV1_OBU_PADDING)
ff_cbs_delete_unit(frag, i);
}
}
return 0;
}
static const CBSBSFType av1_metadata_type = {
.codec_id = AV_CODEC_ID_AV1,
.fragment_name = "temporal unit",
.unit_name = "OBU",
.update_fragment = &av1_metadata_update_fragment,
};
static int av1_metadata_init(AVBSFContext *bsf)
{
AV1MetadataContext *ctx = bsf->priv_data;
ctx->td_obu = (AV1RawOBU) {
.header.obu_type = AV1_OBU_TEMPORAL_DELIMITER,
};
return ff_cbs_bsf_generic_init(bsf, &av1_metadata_type);
}
#define OFFSET(x) offsetof(AV1MetadataContext, x)
#define FLAGS (AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_BSF_PARAM)
static const AVOption av1_metadata_options[] = {
BSF_ELEMENT_OPTIONS_PIR("td", "Temporal Delimiter OBU",
td, FLAGS),
{ "color_primaries", "Set color primaries (section 6.4.2)",
OFFSET(color_primaries), AV_OPT_TYPE_INT,
{ .i64 = -1 }, -1, 255, FLAGS },
{ "transfer_characteristics", "Set transfer characteristics (section 6.4.2)",
OFFSET(transfer_characteristics), AV_OPT_TYPE_INT,
{ .i64 = -1 }, -1, 255, FLAGS },
{ "matrix_coefficients", "Set matrix coefficients (section 6.4.2)",
OFFSET(matrix_coefficients), AV_OPT_TYPE_INT,
{ .i64 = -1 }, -1, 255, FLAGS },
{ "color_range", "Set color range flag (section 6.4.2)",
OFFSET(color_range), AV_OPT_TYPE_INT,
{ .i64 = -1 }, -1, 1, FLAGS, "cr" },
{ "tv", "TV (limited) range", 0, AV_OPT_TYPE_CONST,
{ .i64 = 0 }, .flags = FLAGS, .unit = "cr" },
{ "pc", "PC (full) range", 0, AV_OPT_TYPE_CONST,
{ .i64 = 1 }, .flags = FLAGS, .unit = "cr" },
{ "chroma_sample_position", "Set chroma sample position (section 6.4.2)",
OFFSET(chroma_sample_position), AV_OPT_TYPE_INT,
{ .i64 = -1 }, -1, 3, FLAGS, "csp" },
{ "unknown", "Unknown chroma sample position", 0, AV_OPT_TYPE_CONST,
{ .i64 = AV1_CSP_UNKNOWN }, .flags = FLAGS, .unit = "csp" },
{ "vertical", "Left chroma sample position", 0, AV_OPT_TYPE_CONST,
{ .i64 = AV1_CSP_VERTICAL }, .flags = FLAGS, .unit = "csp" },
{ "colocated", "Top-left chroma sample position", 0, AV_OPT_TYPE_CONST,
{ .i64 = AV1_CSP_COLOCATED }, .flags = FLAGS, .unit = "csp" },
{ "tick_rate", "Set display tick rate (time_scale / num_units_in_display_tick)",
OFFSET(tick_rate), AV_OPT_TYPE_RATIONAL,
{ .dbl = 0.0 }, 0, UINT_MAX, FLAGS },
{ "num_ticks_per_picture", "Set display ticks per picture for CFR streams",
OFFSET(num_ticks_per_picture), AV_OPT_TYPE_INT,
{ .i64 = -1 }, -1, INT_MAX, FLAGS },
{ "delete_padding", "Delete all Padding OBUs",
OFFSET(delete_padding), AV_OPT_TYPE_BOOL,
{ .i64 = 0 }, 0, 1, FLAGS},
{ NULL }
};
static const AVClass av1_metadata_class = {
.class_name = "av1_metadata_bsf",
.item_name = av_default_item_name,
.option = av1_metadata_options,
.version = LIBAVUTIL_VERSION_INT,
};
static const enum AVCodecID av1_metadata_codec_ids[] = {
AV_CODEC_ID_AV1, AV_CODEC_ID_NONE,
};
const AVBitStreamFilter ff_av1_metadata_bsf = {
.name = "av1_metadata",
.priv_data_size = sizeof(AV1MetadataContext),
.priv_class = &av1_metadata_class,
.init = &av1_metadata_init,
.close = &ff_cbs_bsf_generic_close,
.filter = &ff_cbs_bsf_generic_filter,
.codec_ids = av1_metadata_codec_ids,
};
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