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FFmpeg/libavcodec/hevc_sei.c
Andreas Rheinhardt f89825e60a avcodec/h2645_sei: Factor out freeing common SEI parts 
This commit only factors out freeing the common SEI parts,
not whether the fields indicating whether an SEI is present
shall be reset. H.264 and HEVC differ in this regard
(ff_h264_sei_uninit() really resets, whereas ff_hevc_reset_sei()
only uninits.) and neither actually honours the persistency
as prescribed by the relevant specs.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2022-12-01 11:00:40 +01:00

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/*
* HEVC Supplementary Enhancement Information messages
*
* Copyright (C) 2012 - 2013 Guillaume Martres
* Copyright (C) 2012 - 2013 Gildas Cocherel
* Copyright (C) 2013 Vittorio Giovara
*
* 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 "bytestream.h"
#include "golomb.h"
#include "hevc_ps.h"
#include "hevc_sei.h"
static int decode_nal_sei_decoded_picture_hash(HEVCSEIPictureHash *s,
GetByteContext *gb)
{
int cIdx;
uint8_t hash_type;
//uint16_t picture_crc;
//uint32_t picture_checksum;
hash_type = bytestream2_get_byte(gb);
for (cIdx = 0; cIdx < 3/*((s->sps->chroma_format_idc == 0) ? 1 : 3)*/; cIdx++) {
if (hash_type == 0) {
s->is_md5 = 1;
bytestream2_get_buffer(gb, s->md5[cIdx], sizeof(s->md5[cIdx]));
} else if (hash_type == 1) {
// picture_crc = get_bits(gb, 16);
} else if (hash_type == 2) {
// picture_checksum = get_bits_long(gb, 32);
}
}
return 0;
}
static int decode_nal_sei_mastering_display_info(HEVCSEIMasteringDisplay *s,
GetByteContext *gb)
{
int i;
if (bytestream2_get_bytes_left(gb) < 24)
return AVERROR_INVALIDDATA;
// Mastering primaries
for (i = 0; i < 3; i++) {
s->display_primaries[i][0] = bytestream2_get_be16u(gb);
s->display_primaries[i][1] = bytestream2_get_be16u(gb);
}
// White point (x, y)
s->white_point[0] = bytestream2_get_be16u(gb);
s->white_point[1] = bytestream2_get_be16u(gb);
// Max and min luminance of mastering display
s->max_luminance = bytestream2_get_be32u(gb);
s->min_luminance = bytestream2_get_be32u(gb);
// As this SEI message comes before the first frame that references it,
// initialize the flag to 2 and decrement on IRAP access unit so it
// persists for the coded video sequence (e.g., between two IRAPs)
s->present = 2;
return 0;
}
static int decode_nal_sei_content_light_info(HEVCSEIContentLight *s,
GetByteContext *gb)
{
if (bytestream2_get_bytes_left(gb) < 4)
return AVERROR_INVALIDDATA;
// Max and average light levels
s->max_content_light_level = bytestream2_get_be16u(gb);
s->max_pic_average_light_level = bytestream2_get_be16u(gb);
// As this SEI message comes before the first frame that references it,
// initialize the flag to 2 and decrement on IRAP access unit so it
// persists for the coded video sequence (e.g., between two IRAPs)
s->present = 2;
return 0;
}
static int decode_nal_sei_pic_timing(HEVCSEI *s, GetBitContext *gb,
const HEVCParamSets *ps, void *logctx)
{
HEVCSEIPictureTiming *h = &s->picture_timing;
HEVCSPS *sps;
if (!ps->sps_list[s->active_seq_parameter_set_id])
return(AVERROR(ENOMEM));
sps = (HEVCSPS*)ps->sps_list[s->active_seq_parameter_set_id]->data;
if (sps->vui.frame_field_info_present_flag) {
int pic_struct = get_bits(gb, 4);
h->picture_struct = AV_PICTURE_STRUCTURE_UNKNOWN;
if (pic_struct == 2 || pic_struct == 10 || pic_struct == 12) {
av_log(logctx, AV_LOG_DEBUG, "BOTTOM Field\n");
h->picture_struct = AV_PICTURE_STRUCTURE_BOTTOM_FIELD;
} else if (pic_struct == 1 || pic_struct == 9 || pic_struct == 11) {
av_log(logctx, AV_LOG_DEBUG, "TOP Field\n");
h->picture_struct = AV_PICTURE_STRUCTURE_TOP_FIELD;
} else if (pic_struct == 7) {
av_log(logctx, AV_LOG_DEBUG, "Frame/Field Doubling\n");
h->picture_struct = HEVC_SEI_PIC_STRUCT_FRAME_DOUBLING;
} else if (pic_struct == 8) {
av_log(logctx, AV_LOG_DEBUG, "Frame/Field Tripling\n");
h->picture_struct = HEVC_SEI_PIC_STRUCT_FRAME_TRIPLING;
}
}
return 0;
}
static int decode_nal_sei_active_parameter_sets(HEVCSEI *s, GetBitContext *gb, void *logctx)
{
int num_sps_ids_minus1;
unsigned active_seq_parameter_set_id;
get_bits(gb, 4); // active_video_parameter_set_id
get_bits(gb, 1); // self_contained_cvs_flag
get_bits(gb, 1); // num_sps_ids_minus1
num_sps_ids_minus1 = get_ue_golomb_long(gb); // num_sps_ids_minus1
if (num_sps_ids_minus1 < 0 || num_sps_ids_minus1 > 15) {
av_log(logctx, AV_LOG_ERROR, "num_sps_ids_minus1 %d invalid\n", num_sps_ids_minus1);
return AVERROR_INVALIDDATA;
}
active_seq_parameter_set_id = get_ue_golomb_long(gb);
if (active_seq_parameter_set_id >= HEVC_MAX_SPS_COUNT) {
av_log(logctx, AV_LOG_ERROR, "active_parameter_set_id %d invalid\n", active_seq_parameter_set_id);
return AVERROR_INVALIDDATA;
}
s->active_seq_parameter_set_id = active_seq_parameter_set_id;
return 0;
}
static int decode_nal_sei_timecode(HEVCSEITimeCode *s, GetBitContext *gb)
{
s->num_clock_ts = get_bits(gb, 2);
for (int i = 0; i < s->num_clock_ts; i++) {
s->clock_timestamp_flag[i] = get_bits(gb, 1);
if (s->clock_timestamp_flag[i]) {
s->units_field_based_flag[i] = get_bits(gb, 1);
s->counting_type[i] = get_bits(gb, 5);
s->full_timestamp_flag[i] = get_bits(gb, 1);
s->discontinuity_flag[i] = get_bits(gb, 1);
s->cnt_dropped_flag[i] = get_bits(gb, 1);
s->n_frames[i] = get_bits(gb, 9);
if (s->full_timestamp_flag[i]) {
s->seconds_value[i] = av_clip(get_bits(gb, 6), 0, 59);
s->minutes_value[i] = av_clip(get_bits(gb, 6), 0, 59);
s->hours_value[i] = av_clip(get_bits(gb, 5), 0, 23);
} else {
s->seconds_flag[i] = get_bits(gb, 1);
if (s->seconds_flag[i]) {
s->seconds_value[i] = av_clip(get_bits(gb, 6), 0, 59);
s->minutes_flag[i] = get_bits(gb, 1);
if (s->minutes_flag[i]) {
s->minutes_value[i] = av_clip(get_bits(gb, 6), 0, 59);
s->hours_flag[i] = get_bits(gb, 1);
if (s->hours_flag[i]) {
s->hours_value[i] = av_clip(get_bits(gb, 5), 0, 23);
}
}
}
}
s->time_offset_length[i] = get_bits(gb, 5);
if (s->time_offset_length[i] > 0) {
s->time_offset_value[i] = get_bits_long(gb, s->time_offset_length[i]);
}
}
}
s->present = 1;
return 0;
}
static int decode_nal_sei_prefix(GetBitContext *gb, GetByteContext *gbyte,
void *logctx, HEVCSEI *s,
const HEVCParamSets *ps, int type)
{
switch (type) {
case 256: // Mismatched value from HM 8.1
return decode_nal_sei_decoded_picture_hash(&s->picture_hash, gbyte);
case SEI_TYPE_PIC_TIMING:
return decode_nal_sei_pic_timing(s, gb, ps, logctx);
case SEI_TYPE_MASTERING_DISPLAY_COLOUR_VOLUME:
return decode_nal_sei_mastering_display_info(&s->mastering_display, gbyte);
case SEI_TYPE_CONTENT_LIGHT_LEVEL_INFO:
return decode_nal_sei_content_light_info(&s->content_light, gbyte);
case SEI_TYPE_ACTIVE_PARAMETER_SETS:
return decode_nal_sei_active_parameter_sets(s, gb, logctx);
case SEI_TYPE_TIME_CODE:
return decode_nal_sei_timecode(&s->timecode, gb);
default: {
int ret = ff_h2645_sei_message_decode(&s->common, type, AV_CODEC_ID_HEVC,
gb, gbyte, logctx);
if (ret == FF_H2645_SEI_MESSAGE_UNHANDLED)
av_log(logctx, AV_LOG_DEBUG, "Skipped PREFIX SEI %d\n", type);
return ret;
}
}
}
static int decode_nal_sei_suffix(GetBitContext *gb, GetByteContext *gbyte,
void *logctx, HEVCSEI *s, int type)
{
switch (type) {
case SEI_TYPE_DECODED_PICTURE_HASH:
return decode_nal_sei_decoded_picture_hash(&s->picture_hash, gbyte);
default:
av_log(logctx, AV_LOG_DEBUG, "Skipped SUFFIX SEI %d\n", type);
return 0;
}
}
static int decode_nal_sei_message(GetByteContext *gb, void *logctx, HEVCSEI *s,
const HEVCParamSets *ps, int nal_unit_type)
{
GetByteContext message_gbyte;
GetBitContext message_gb;
int payload_type = 0;
int payload_size = 0;
int byte = 0xFF;
av_unused int ret;
av_log(logctx, AV_LOG_DEBUG, "Decoding SEI\n");
while (byte == 0xFF) {
if (bytestream2_get_bytes_left(gb) < 2 || payload_type > INT_MAX - 255)
return AVERROR_INVALIDDATA;
byte = bytestream2_get_byteu(gb);
payload_type += byte;
}
byte = 0xFF;
while (byte == 0xFF) {
if (bytestream2_get_bytes_left(gb) < 1 + payload_size)
return AVERROR_INVALIDDATA;
byte = bytestream2_get_byteu(gb);
payload_size += byte;
}
if (bytestream2_get_bytes_left(gb) < payload_size)
return AVERROR_INVALIDDATA;
bytestream2_init(&message_gbyte, gb->buffer, payload_size);
ret = init_get_bits8(&message_gb, gb->buffer, payload_size);
av_assert1(ret >= 0);
bytestream2_skipu(gb, payload_size);
if (nal_unit_type == HEVC_NAL_SEI_PREFIX) {
return decode_nal_sei_prefix(&message_gb, &message_gbyte,
logctx, s, ps, payload_type);
} else { /* nal_unit_type == NAL_SEI_SUFFIX */
return decode_nal_sei_suffix(&message_gb, &message_gbyte,
logctx, s, payload_type);
}
}
int ff_hevc_decode_nal_sei(GetBitContext *gb, void *logctx, HEVCSEI *s,
const HEVCParamSets *ps, enum HEVCNALUnitType type)
{
GetByteContext gbyte;
int ret;
av_assert1((get_bits_count(gb) % 8) == 0);
bytestream2_init(&gbyte, gb->buffer + get_bits_count(gb) / 8,
get_bits_left(gb) / 8);
do {
ret = decode_nal_sei_message(&gbyte, logctx, s, ps, type);
if (ret < 0)
return ret;
} while (bytestream2_get_bytes_left(&gbyte) > 0);
return 1;
}
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