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FFmpeg/libavcodec/h264_metadata_bsf.c

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/*
* This file is part of Libav.
*
* Libav 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.
*
* Libav 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 Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "libavutil/avstring.h"
#include "libavutil/common.h"
#include "libavutil/opt.h"
#include "bsf.h"
#include "cbs.h"
#include "cbs_h264.h"
#include "h264.h"
#include "h264_sei.h"
enum {
PASS,
INSERT,
REMOVE,
};
typedef struct H264MetadataContext {
const AVClass *class;
CodedBitstreamContext cbc;
CodedBitstreamFragment access_unit;
H264RawAUD aud_nal;
H264RawSEI sei_nal;
int aud;
AVRational sample_aspect_ratio;
int video_format;
int video_full_range_flag;
int colour_primaries;
int transfer_characteristics;
int matrix_coefficients;
int chroma_sample_loc_type;
AVRational tick_rate;
int fixed_frame_rate_flag;
int crop_left;
int crop_right;
int crop_top;
int crop_bottom;
const char *sei_user_data;
} H264MetadataContext;
static int h264_metadata_update_sps(AVBSFContext *bsf,
H264RawSPS *sps)
{
H264MetadataContext *ctx = bsf->priv_data;
int need_vui = 0;
int crop_unit_x, crop_unit_y;
if (ctx->sample_aspect_ratio.num && ctx->sample_aspect_ratio.den) {
// Table E-1.
static const AVRational sar_idc[] = {
{ 0, 0 }, // Unspecified (never written here).
{ 1, 1 }, { 12, 11 }, { 10, 11 }, { 16, 11 },
{ 40, 33 }, { 24, 11 }, { 20, 11 }, { 32, 11 },
{ 80, 33 }, { 18, 11 }, { 15, 11 }, { 64, 33 },
{ 160, 99 }, { 4, 3 }, { 3, 2 }, { 2, 1 },
};
int num, den, i;
av_reduce(&num, &den, ctx->sample_aspect_ratio.num,
ctx->sample_aspect_ratio.den, 65535);
for (i = 1; i < FF_ARRAY_ELEMS(sar_idc); i++) {
if (num == sar_idc[i].num &&
den == sar_idc[i].den)
break;
}
if (i == FF_ARRAY_ELEMS(sar_idc)) {
sps->vui.aspect_ratio_idc = 255;
sps->vui.sar_width = num;
sps->vui.sar_height = den;
} else {
sps->vui.aspect_ratio_idc = i;
}
sps->vui.aspect_ratio_info_present_flag = 1;
need_vui = 1;
}
#define SET_OR_INFER(field, value, present_flag, infer) do { \
if (value >= 0) { \
field = value; \
need_vui = 1; \
} else if (!present_flag) \
field = infer; \
} while (0)
if (ctx->video_format >= 0 ||
ctx->video_full_range_flag >= 0 ||
ctx->colour_primaries >= 0 ||
ctx->transfer_characteristics >= 0 ||
ctx->matrix_coefficients >= 0) {
SET_OR_INFER(sps->vui.video_format, ctx->video_format,
sps->vui.video_signal_type_present_flag, 5);
SET_OR_INFER(sps->vui.video_full_range_flag,
ctx->video_full_range_flag,
sps->vui.video_signal_type_present_flag, 0);
if (ctx->colour_primaries >= 0 ||
ctx->transfer_characteristics >= 0 ||
ctx->matrix_coefficients >= 0) {
SET_OR_INFER(sps->vui.colour_primaries,
ctx->colour_primaries,
sps->vui.colour_description_present_flag, 2);
SET_OR_INFER(sps->vui.transfer_characteristics,
ctx->transfer_characteristics,
sps->vui.colour_description_present_flag, 2);
SET_OR_INFER(sps->vui.matrix_coefficients,
ctx->matrix_coefficients,
sps->vui.colour_description_present_flag, 2);
sps->vui.colour_description_present_flag = 1;
}
sps->vui.video_signal_type_present_flag = 1;
need_vui = 1;
}
if (ctx->chroma_sample_loc_type >= 0) {
sps->vui.chroma_sample_loc_type_top_field =
ctx->chroma_sample_loc_type;
sps->vui.chroma_sample_loc_type_bottom_field =
ctx->chroma_sample_loc_type;
sps->vui.chroma_loc_info_present_flag = 1;
need_vui = 1;
}
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);
sps->vui.time_scale = num;
sps->vui.num_units_in_tick = den;
sps->vui.timing_info_present_flag = 1;
need_vui = 1;
}
SET_OR_INFER(sps->vui.fixed_frame_rate_flag,
ctx->fixed_frame_rate_flag,
sps->vui.timing_info_present_flag, 0);
if (sps->separate_colour_plane_flag || sps->chroma_format_idc == 0) {
crop_unit_x = 1;
crop_unit_y = 2 - sps->frame_mbs_only_flag;
} else {
crop_unit_x = 1 + (sps->chroma_format_idc < 3);
crop_unit_y = (1 + (sps->chroma_format_idc < 2)) *
(2 - sps->frame_mbs_only_flag);
}
#define CROP(border, unit) do { \
if (ctx->crop_ ## border >= 0) { \
if (ctx->crop_ ## border % unit != 0) { \
av_log(bsf, AV_LOG_ERROR, "Invalid value for crop_%s: " \
"must be a multiple of %d.\n", #border, unit); \
return AVERROR(EINVAL); \
} \
sps->frame_crop_ ## border ## _offset = \
ctx->crop_ ## border / unit; \
sps->frame_cropping_flag = 1; \
} \
} while (0)
CROP(left, crop_unit_x);
CROP(right, crop_unit_x);
CROP(top, crop_unit_y);
CROP(bottom, crop_unit_y);
#undef CROP
if (need_vui)
sps->vui_parameters_present_flag = 1;
return 0;
}
static int h264_metadata_filter(AVBSFContext *bsf, AVPacket *out)
{
H264MetadataContext *ctx = bsf->priv_data;
AVPacket *in = NULL;
CodedBitstreamFragment *au = &ctx->access_unit;
int err, i, j, has_sps;
char *sei_udu_string = NULL;
err = ff_bsf_get_packet(bsf, &in);
if (err < 0)
goto fail;
err = ff_cbs_read_packet(&ctx->cbc, au, in);
if (err < 0) {
av_log(bsf, AV_LOG_ERROR, "Failed to read packet.\n");
goto fail;
}
if (au->nb_units == 0) {
av_log(bsf, AV_LOG_ERROR, "No NAL units in packet.\n");
err = AVERROR_INVALIDDATA;
goto fail;
}
// If an AUD is present, it must be the first NAL unit.
if (au->units[0].type == H264_NAL_AUD) {
if (ctx->aud == REMOVE)
ff_cbs_delete_unit(&ctx->cbc, au, 0);
} else {
if (ctx->aud == INSERT) {
static const int primary_pic_type_table[] = {
0x084, // 2, 7
0x0a5, // 0, 2, 5, 7
0x0e7, // 0, 1, 2, 5, 6, 7
0x210, // 4, 9
0x318, // 3, 4, 8, 9
0x294, // 2, 4, 7, 9
0x3bd, // 0, 2, 3, 4, 5, 7, 8, 9
0x3ff, // 0, 1, 2, 3, 4, 5, 6, 7, 8, 9
};
int primary_pic_type_mask = 0xff;
H264RawAUD *aud = &ctx->aud_nal;
for (i = 0; i < au->nb_units; i++) {
if (au->units[i].type == H264_NAL_SLICE ||
au->units[i].type == H264_NAL_IDR_SLICE) {
H264RawSlice *slice = au->units[i].content;
for (j = 0; j < FF_ARRAY_ELEMS(primary_pic_type_table); j++) {
if (!(primary_pic_type_table[j] &
(1 << slice->header.slice_type)))
primary_pic_type_mask &= ~(1 << j);
}
}
}
for (j = 0; j < FF_ARRAY_ELEMS(primary_pic_type_table); j++)
if (primary_pic_type_mask & (1 << j))
break;
if (j >= FF_ARRAY_ELEMS(primary_pic_type_table)) {
av_log(bsf, AV_LOG_ERROR, "No usable primary_pic_type: "
"invalid slice types?\n");
err = AVERROR_INVALIDDATA;
goto fail;
}
aud->nal_unit_header.nal_unit_type = H264_NAL_AUD;
aud->primary_pic_type = j;
err = ff_cbs_insert_unit_content(&ctx->cbc, au,
0, H264_NAL_AUD, aud);
if (err < 0) {
av_log(bsf, AV_LOG_ERROR, "Failed to insert AUD.\n");
goto fail;
}
}
}
has_sps = 0;
for (i = 0; i < au->nb_units; i++) {
if (au->units[i].type == H264_NAL_SPS) {
err = h264_metadata_update_sps(bsf, au->units[i].content);
if (err < 0)
goto fail;
has_sps = 1;
}
}
// Only insert the SEI in access units containing SPSs.
if (has_sps && ctx->sei_user_data) {
H264RawSEI *sei;
H264RawSEIPayload *payload;
H264RawSEIUserDataUnregistered *udu;
int sei_pos, sei_new;
for (i = 0; i < au->nb_units; i++) {
if (au->units[i].type == H264_NAL_SEI ||
au->units[i].type == H264_NAL_SLICE ||
au->units[i].type == H264_NAL_IDR_SLICE)
break;
}
sei_pos = i;
if (sei_pos < au->nb_units &&
au->units[sei_pos].type == H264_NAL_SEI) {
sei_new = 0;
sei = au->units[sei_pos].content;
} else {
sei_new = 1;
sei = &ctx->sei_nal;
memset(sei, 0, sizeof(*sei));
sei->nal_unit_header.nal_unit_type = H264_NAL_SEI;
err = ff_cbs_insert_unit_content(&ctx->cbc, au,
sei_pos, H264_NAL_SEI, sei);
if (err < 0) {
av_log(bsf, AV_LOG_ERROR, "Failed to insert SEI.\n");
goto fail;
}
}
payload = &sei->payload[sei->payload_count];
payload->payload_type = H264_SEI_TYPE_USER_DATA_UNREGISTERED;
udu = &payload->payload.user_data_unregistered;
for (i = j = 0; j < 32 && ctx->sei_user_data[i]; i++) {
int c, v;
c = ctx->sei_user_data[i];
if (c == '-') {
continue;
} else if (av_isxdigit(c)) {
c = av_tolower(c);
v = (c <= '9' ? c - '0' : c - 'a' + 10);
} else {
goto invalid_user_data;
}
if (i & 1)
udu->uuid_iso_iec_11578[j / 2] |= v;
else
udu->uuid_iso_iec_11578[j / 2] = v << 4;
++j;
}
if (j == 32 && ctx->sei_user_data[i] == '+') {
sei_udu_string = av_strdup(ctx->sei_user_data + i + 1);
if (!sei_udu_string) {
err = AVERROR(ENOMEM);
goto sei_fail;
}
udu->data = sei_udu_string;
udu->data_length = strlen(sei_udu_string);
payload->payload_size = 16 + udu->data_length;
if (!sei_new) {
// This will be freed by the existing internal
// reference in fragment_uninit().
sei_udu_string = NULL;
}
} else {
invalid_user_data:
av_log(bsf, AV_LOG_ERROR, "Invalid user data: "
"must be \"UUID+string\".\n");
err = AVERROR(EINVAL);
sei_fail:
memset(payload, 0, sizeof(*payload));
goto fail;
}
++sei->payload_count;
}
err = ff_cbs_write_packet(&ctx->cbc, out, au);
if (err < 0) {
av_log(bsf, AV_LOG_ERROR, "Failed to write packet.\n");
goto fail;
}
err = av_packet_copy_props(out, in);
if (err < 0)
goto fail;
err = 0;
fail:
ff_cbs_fragment_uninit(&ctx->cbc, au);
av_freep(&sei_udu_string);
av_packet_free(&in);
return err;
}
static int h264_metadata_init(AVBSFContext *bsf)
{
H264MetadataContext *ctx = bsf->priv_data;
CodedBitstreamFragment *au = &ctx->access_unit;
int err, i;
err = ff_cbs_init(&ctx->cbc, AV_CODEC_ID_H264, bsf);
if (err < 0)
return err;
if (bsf->par_in->extradata) {
err = ff_cbs_read_extradata(&ctx->cbc, au, bsf->par_in);
if (err < 0) {
av_log(bsf, AV_LOG_ERROR, "Failed to read extradata.\n");
goto fail;
}
for (i = 0; i < au->nb_units; i++) {
if (au->units[i].type == H264_NAL_SPS) {
err = h264_metadata_update_sps(bsf, au->units[i].content);
if (err < 0)
goto fail;
}
}
err = ff_cbs_write_extradata(&ctx->cbc, bsf->par_out, au);
if (err < 0) {
av_log(bsf, AV_LOG_ERROR, "Failed to write extradata.\n");
goto fail;
}
}
err = 0;
fail:
ff_cbs_fragment_uninit(&ctx->cbc, au);
return err;
}
static void h264_metadata_close(AVBSFContext *bsf)
{
H264MetadataContext *ctx = bsf->priv_data;
ff_cbs_close(&ctx->cbc);
}
#define OFFSET(x) offsetof(H264MetadataContext, x)
static const AVOption h264_metadata_options[] = {
{ "aud", "Access Unit Delimiter NAL units",
OFFSET(aud), AV_OPT_TYPE_INT,
{ .i64 = PASS }, PASS, REMOVE, 0, "aud" },
{ "pass", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = PASS }, .unit = "aud" },
{ "insert", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = INSERT }, .unit = "aud" },
{ "remove", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = REMOVE }, .unit = "aud" },
{ "sample_aspect_ratio", "Set sample aspect ratio (table E-1)",
OFFSET(sample_aspect_ratio), AV_OPT_TYPE_RATIONAL,
{ .i64 = 0 }, 0, 65535 },
{ "video_format", "Set video format (table E-2)",
OFFSET(video_format), AV_OPT_TYPE_INT,
{ .i64 = -1 }, -1, 7 },
{ "video_full_range_flag", "Set video full range flag",
OFFSET(video_full_range_flag), AV_OPT_TYPE_INT,
{ .i64 = -1 }, -1, 1 },
{ "colour_primaries", "Set colour primaries (table E-3)",
OFFSET(colour_primaries), AV_OPT_TYPE_INT,
{ .i64 = -1 }, -1, 255 },
{ "transfer_characteristics", "Set transfer characteristics (table E-4)",
OFFSET(transfer_characteristics), AV_OPT_TYPE_INT,
{ .i64 = -1 }, -1, 255 },
{ "matrix_coefficients", "Set matrix coefficients (table E-5)",
OFFSET(matrix_coefficients), AV_OPT_TYPE_INT,
{ .i64 = -1 }, -1, 255 },
{ "chroma_sample_loc_type", "Set chroma sample location type (figure E-1)",
OFFSET(chroma_sample_loc_type), AV_OPT_TYPE_INT,
{ .i64 = -1 }, -1, 6 },
{ "tick_rate", "Set VUI tick rate (num_units_in_tick / time_scale)",
OFFSET(tick_rate), AV_OPT_TYPE_RATIONAL,
{ .i64 = 0 }, 0, UINT_MAX },
{ "fixed_frame_rate_flag", "Set VUI fixed frame rate flag",
OFFSET(fixed_frame_rate_flag), AV_OPT_TYPE_INT,
{ .i64 = -1 }, -1, 1 },
{ "crop_left", "Set left border crop offset",
OFFSET(crop_left), AV_OPT_TYPE_INT,
{ .i64 = -1 }, -1, H264_MAX_WIDTH },
{ "crop_right", "Set right border crop offset",
OFFSET(crop_right), AV_OPT_TYPE_INT,
{ .i64 = -1 }, -1, H264_MAX_WIDTH },
{ "crop_top", "Set top border crop offset",
OFFSET(crop_top), AV_OPT_TYPE_INT,
{ .i64 = -1 }, -1, H264_MAX_HEIGHT },
{ "crop_bottom", "Set bottom border crop offset",
OFFSET(crop_bottom), AV_OPT_TYPE_INT,
{ .i64 = -1 }, -1, H264_MAX_HEIGHT },
{ "sei_user_data", "Insert SEI user data (UUID+string)",
OFFSET(sei_user_data), AV_OPT_TYPE_STRING, { .str = NULL } },
{ NULL }
};
static const AVClass h264_metadata_class = {
.class_name = "h264_metadata_bsf",
.item_name = av_default_item_name,
.option = h264_metadata_options,
.version = LIBAVCODEC_VERSION_MAJOR,
};
static const enum AVCodecID h264_metadata_codec_ids[] = {
AV_CODEC_ID_H264, AV_CODEC_ID_NONE,
};
const AVBitStreamFilter ff_h264_metadata_bsf = {
.name = "h264_metadata",
.priv_data_size = sizeof(H264MetadataContext),
.priv_class = &h264_metadata_class,
.init = &h264_metadata_init,
.close = &h264_metadata_close,
.filter = &h264_metadata_filter,
.codec_ids = h264_metadata_codec_ids,
};
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