libavcodec/h264_sei.c - third_party/ffmpeg - Git at Google

 /*
  * H.26L/H.264/AVC/JVT/14496-10/... SEI decoding
  * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
  *
  * 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
  * H.264 / AVC / MPEG-4 part10 SEI decoding.
  * @author Michael Niedermayer <michaelni@gmx.at>
  */

 #include <limits.h>
 #include <stdio.h>
 #include <string.h>
 #include "libavutil/error.h"
 #include "libavutil/log.h"
 #include "libavutil/macros.h"
 #include "libavutil/mem.h"
 #include "bytestream.h"
 #include "get_bits.h"
 #include "golomb.h"
 #include "h264_ps.h"
 #include "h264_sei.h"
 #include "sei.h"

 #define AVERROR_PS_NOT_FOUND      FFERRTAG(0xF8,'?','P','S')

 static const uint8_t sei_num_clock_ts_table[9] = {
     1, 1, 1, 2, 2, 3, 3, 2, 3
 };

 void ff_h264_sei_uninit(H264SEIContext *h)
 {
     h->recovery_point.recovery_frame_cnt = -1;

     h->picture_timing.dpb_output_delay  = 0;
     h->picture_timing.cpb_removal_delay = -1;

     h->picture_timing.present      = 0;
     h->buffering_period.present    = 0;
     h->common.frame_packing.present       = 0;
     h->common.film_grain_characteristics.present = 0;
     h->common.display_orientation.present = 0;
     h->common.afd.present                 =  0;

     ff_h2645_sei_reset(&h->common);
 }

 int ff_h264_sei_process_picture_timing(H264SEIPictureTiming *h, const SPS *sps,
                                        void *logctx)
 {
     GetBitContext gb;
     av_unused int ret;

     ret = init_get_bits8(&gb, h->payload, h->payload_size_bytes);
     av_assert1(ret >= 0);

     if (sps->nal_hrd_parameters_present_flag ||
         sps->vcl_hrd_parameters_present_flag) {
         h->cpb_removal_delay = get_bits_long(&gb, sps->cpb_removal_delay_length);
         h->dpb_output_delay  = get_bits_long(&gb, sps->dpb_output_delay_length);
     }
     if (sps->pic_struct_present_flag) {
         unsigned int i, num_clock_ts;

         h->pic_struct = get_bits(&gb, 4);
         h->ct_type    = 0;

         if (h->pic_struct > H264_SEI_PIC_STRUCT_FRAME_TRIPLING)
             return AVERROR_INVALIDDATA;

         num_clock_ts = sei_num_clock_ts_table[h->pic_struct];
         h->timecode_cnt = 0;
         for (i = 0; i < num_clock_ts; i++) {
             if (get_bits(&gb, 1)) {                      /* clock_timestamp_flag */
                 H264SEITimeCode *tc = &h->timecode[h->timecode_cnt++];
                 unsigned int full_timestamp_flag;
                 unsigned int counting_type, cnt_dropped_flag;
                 h->ct_type |= 1 << get_bits(&gb, 2);
                 skip_bits(&gb, 1);                       /* nuit_field_based_flag */
                 counting_type = get_bits(&gb, 5);        /* counting_type */
                 full_timestamp_flag = get_bits(&gb, 1);
                 skip_bits(&gb, 1);                       /* discontinuity_flag */
                 cnt_dropped_flag = get_bits(&gb, 1);      /* cnt_dropped_flag */
                 if (cnt_dropped_flag && counting_type > 1 && counting_type < 7)
                     tc->dropframe = 1;
                 tc->frame = get_bits(&gb, 8);         /* n_frames */
                 if (full_timestamp_flag) {
                     tc->full = 1;
                     tc->seconds = get_bits(&gb, 6); /* seconds_value 0..59 */
                     tc->minutes = get_bits(&gb, 6); /* minutes_value 0..59 */
                     tc->hours = get_bits(&gb, 5);   /* hours_value 0..23 */
                 } else {
                     tc->seconds = tc->minutes = tc->hours = tc->full = 0;
                     if (get_bits(&gb, 1)) {             /* seconds_flag */
                         tc->seconds = get_bits(&gb, 6);
                         if (get_bits(&gb, 1)) {         /* minutes_flag */
                             tc->minutes = get_bits(&gb, 6);
                             if (get_bits(&gb, 1))       /* hours_flag */
                                 tc->hours = get_bits(&gb, 5);
                         }
                     }
                 }

                 if (sps->time_offset_length > 0)
                     skip_bits(&gb,
                               sps->time_offset_length); /* time_offset */
             }
         }

         av_log(logctx, AV_LOG_DEBUG, "ct_type:%X pic_struct:%d\n",
                h->ct_type, h->pic_struct);
     }

     return 0;
 }

 static int decode_picture_timing(H264SEIPictureTiming *h, GetByteContext *gb,
                                  void *logctx)
 {
     int size = bytestream2_get_bytes_left(gb);

     if (size > sizeof(h->payload)) {
         av_log(logctx, AV_LOG_ERROR, "Picture timing SEI payload too large\n");
         return AVERROR_INVALIDDATA;
     }
     bytestream2_get_bufferu(gb, h->payload, size);

     h->payload_size_bytes = size;

     h->present = 1;
     return 0;
 }

 static int decode_recovery_point(H264SEIRecoveryPoint *h, GetBitContext *gb, void *logctx)
 {
     unsigned recovery_frame_cnt = get_ue_golomb_long(gb);

     if (recovery_frame_cnt >= (1<<MAX_LOG2_MAX_FRAME_NUM)) {
         av_log(logctx, AV_LOG_ERROR, "recovery_frame_cnt %u is out of range\n", recovery_frame_cnt);
         return AVERROR_INVALIDDATA;
     }

     h->recovery_frame_cnt = recovery_frame_cnt;
     /* 1b exact_match_flag,
      * 1b broken_link_flag,
      * 2b changing_slice_group_idc */
     skip_bits(gb, 4);

     return 0;
 }

 static int decode_buffering_period(H264SEIBufferingPeriod *h, GetBitContext *gb,
                                    const H264ParamSets *ps, void *logctx)
 {
     unsigned int sps_id;
     int sched_sel_idx;
     const SPS *sps;

     sps_id = get_ue_golomb_31(gb);
     if (sps_id > 31 || !ps->sps_list[sps_id]) {
         av_log(logctx, AV_LOG_ERROR,
                "non-existing SPS %d referenced in buffering period\n", sps_id);
         return sps_id > 31 ? AVERROR_INVALIDDATA : AVERROR_PS_NOT_FOUND;
     }
     sps = ps->sps_list[sps_id];

     // NOTE: This is really so duplicated in the standard... See H.264, D.1.1
     if (sps->nal_hrd_parameters_present_flag) {
         for (sched_sel_idx = 0; sched_sel_idx < sps->cpb_cnt; sched_sel_idx++) {
             h->initial_cpb_removal_delay[sched_sel_idx] =
                 get_bits_long(gb, sps->initial_cpb_removal_delay_length);
             // initial_cpb_removal_delay_offset
             skip_bits(gb, sps->initial_cpb_removal_delay_length);
         }
     }
     if (sps->vcl_hrd_parameters_present_flag) {
         for (sched_sel_idx = 0; sched_sel_idx < sps->cpb_cnt; sched_sel_idx++) {
             h->initial_cpb_removal_delay[sched_sel_idx] =
                 get_bits_long(gb, sps->initial_cpb_removal_delay_length);
             // initial_cpb_removal_delay_offset
             skip_bits(gb, sps->initial_cpb_removal_delay_length);
         }
     }

     h->present = 1;
     return 0;
 }

 static int decode_green_metadata(H264SEIGreenMetaData *h, GetByteContext *gb)
 {
     h->green_metadata_type = bytestream2_get_byte(gb);

     if (h->green_metadata_type == 0) {
         h->period_type = bytestream2_get_byte(gb);

         if (h->period_type == 2)
             h->num_seconds = bytestream2_get_be16(gb);
         else if (h->period_type == 3)
             h->num_pictures = bytestream2_get_be16(gb);

         h->percent_non_zero_macroblocks            = bytestream2_get_byte(gb);
         h->percent_intra_coded_macroblocks         = bytestream2_get_byte(gb);
         h->percent_six_tap_filtering               = bytestream2_get_byte(gb);
         h->percent_alpha_point_deblocking_instance = bytestream2_get_byte(gb);

     } else if (h->green_metadata_type == 1) {
         h->xsd_metric_type  = bytestream2_get_byte(gb);
         h->xsd_metric_value = bytestream2_get_be16(gb);
     }

     return 0;
 }

 int ff_h264_sei_decode(H264SEIContext *h, GetBitContext *gb,
                        const H264ParamSets *ps, void *logctx)
 {
     GetByteContext gbyte;
     int master_ret = 0;

     av_assert1((get_bits_count(gb) % 8) == 0);
     bytestream2_init(&gbyte, gb->buffer + get_bits_count(gb) / 8,
                      get_bits_left(gb) / 8);

     while (bytestream2_get_bytes_left(&gbyte) > 2 && bytestream2_peek_ne16(&gbyte)) {
         GetByteContext gbyte_payload;
         GetBitContext gb_payload;
         int type = 0;
         unsigned size = 0;
         int ret  = 0;

         do {
             if (bytestream2_get_bytes_left(&gbyte) <= 0)
                 return AVERROR_INVALIDDATA;
             type += bytestream2_peek_byteu(&gbyte);
         } while (bytestream2_get_byteu(&gbyte) == 255);

         do {
             if (bytestream2_get_bytes_left(&gbyte) <= 0)
                 return AVERROR_INVALIDDATA;
             size += bytestream2_peek_byteu(&gbyte);
         } while (bytestream2_get_byteu(&gbyte) == 255);

         if (size > bytestream2_get_bytes_left(&gbyte)) {
             av_log(logctx, AV_LOG_ERROR, "SEI type %d size %d truncated at %d\n",
                    type, size, bytestream2_get_bytes_left(&gbyte));
             return AVERROR_INVALIDDATA;
         }

         bytestream2_init (&gbyte_payload, gbyte.buffer, size);
         ret = init_get_bits8(&gb_payload, gbyte.buffer, size);
         if (ret < 0)
             return ret;

         switch (type) {
         case SEI_TYPE_PIC_TIMING: // Picture timing SEI
             ret = decode_picture_timing(&h->picture_timing, &gbyte_payload, logctx);
             break;
         case SEI_TYPE_RECOVERY_POINT:
             ret = decode_recovery_point(&h->recovery_point, &gb_payload, logctx);
             break;
         case SEI_TYPE_BUFFERING_PERIOD:
             ret = decode_buffering_period(&h->buffering_period, &gb_payload, ps, logctx);
             break;
         case SEI_TYPE_GREEN_METADATA:
             ret = decode_green_metadata(&h->green_metadata, &gbyte_payload);
             break;
         default:
             ret = ff_h2645_sei_message_decode(&h->common, type, AV_CODEC_ID_H264,
                                               &gb_payload, &gbyte_payload, logctx);
             if (ret == FF_H2645_SEI_MESSAGE_UNHANDLED)
                 av_log(logctx, AV_LOG_DEBUG, "unknown SEI type %d\n", type);
         }
         if (ret < 0 && ret != AVERROR_PS_NOT_FOUND)
             return ret;
         if (ret < 0)
             master_ret = ret;

         if (get_bits_left(&gb_payload) < 0) {
             av_log(logctx, AV_LOG_WARNING, "SEI type %d overread by %d bits\n",
                    type, -get_bits_left(&gb_payload));
         }

         bytestream2_skipu(&gbyte, size);
     }

     return master_ret;
 }

 const char *ff_h264_sei_stereo_mode(const H2645SEIFramePacking *h)
 {
     if (h->arrangement_cancel_flag == 0) {
         switch (h->arrangement_type) {
             case SEI_FPA_H264_TYPE_CHECKERBOARD:
                 if (h->content_interpretation_type == 2)
                     return "checkerboard_rl";
                 else
                     return "checkerboard_lr";
             case SEI_FPA_H264_TYPE_INTERLEAVE_COLUMN:
                 if (h->content_interpretation_type == 2)
                     return "col_interleaved_rl";
                 else
                     return "col_interleaved_lr";
             case SEI_FPA_H264_TYPE_INTERLEAVE_ROW:
                 if (h->content_interpretation_type == 2)
                     return "row_interleaved_rl";
                 else
                     return "row_interleaved_lr";
             case SEI_FPA_TYPE_SIDE_BY_SIDE:
                 if (h->content_interpretation_type == 2)
                     return "right_left";
                 else
                     return "left_right";
             case SEI_FPA_TYPE_TOP_BOTTOM:
                 if (h->content_interpretation_type == 2)
                     return "bottom_top";
                 else
                     return "top_bottom";
             case SEI_FPA_TYPE_INTERLEAVE_TEMPORAL:
                 if (h->content_interpretation_type == 2)
                     return "block_rl";
                 else
                     return "block_lr";
             case SEI_FPA_H264_TYPE_2D:
             default:
                 return "mono";
         }
     } else if (h->arrangement_cancel_flag == 1) {
         return "mono";
     } else {
         return NULL;
     }
 }
	/*
	* H.26L/H.264/AVC/JVT/14496-10/... SEI decoding
	* Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
	*
	* 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
	* H.264 / AVC / MPEG-4 part10 SEI decoding.
	* @author Michael Niedermayer <michaelni@gmx.at>
	*/

	#include <limits.h>
	#include <stdio.h>
	#include <string.h>
	#include "libavutil/error.h"
	#include "libavutil/log.h"
	#include "libavutil/macros.h"
	#include "libavutil/mem.h"
	#include "bytestream.h"
	#include "get_bits.h"
	#include "golomb.h"
	#include "h264_ps.h"
	#include "h264_sei.h"
	#include "sei.h"

	#define AVERROR_PS_NOT_FOUND FFERRTAG(0xF8,'?','P','S')

	static const uint8_t sei_num_clock_ts_table[9] = {
	1, 1, 1, 2, 2, 3, 3, 2, 3
	};

	void ff_h264_sei_uninit(H264SEIContext *h)
	{
	h->recovery_point.recovery_frame_cnt = -1;

	h->picture_timing.dpb_output_delay = 0;
	h->picture_timing.cpb_removal_delay = -1;

	h->picture_timing.present = 0;
	h->buffering_period.present = 0;
	h->common.frame_packing.present = 0;
	h->common.film_grain_characteristics.present = 0;
	h->common.display_orientation.present = 0;
	h->common.afd.present = 0;

	ff_h2645_sei_reset(&h->common);
	}

	int ff_h264_sei_process_picture_timing(H264SEIPictureTiming h, const SPS sps,
	void *logctx)
	{
	GetBitContext gb;
	av_unused int ret;

	ret = init_get_bits8(&gb, h->payload, h->payload_size_bytes);
	av_assert1(ret >= 0);

	if (sps->nal_hrd_parameters_present_flag \|\|
	sps->vcl_hrd_parameters_present_flag) {
	h->cpb_removal_delay = get_bits_long(&gb, sps->cpb_removal_delay_length);
	h->dpb_output_delay = get_bits_long(&gb, sps->dpb_output_delay_length);
	}
	if (sps->pic_struct_present_flag) {
	unsigned int i, num_clock_ts;

	h->pic_struct = get_bits(&gb, 4);
	h->ct_type = 0;

	if (h->pic_struct > H264_SEI_PIC_STRUCT_FRAME_TRIPLING)
	return AVERROR_INVALIDDATA;

	num_clock_ts = sei_num_clock_ts_table[h->pic_struct];
	h->timecode_cnt = 0;
	for (i = 0; i < num_clock_ts; i++) {
	if (get_bits(&gb, 1)) { /* clock_timestamp_flag */
	H264SEITimeCode *tc = &h->timecode[h->timecode_cnt++];
	unsigned int full_timestamp_flag;
	unsigned int counting_type, cnt_dropped_flag;
	h->ct_type \|= 1 << get_bits(&gb, 2);
	skip_bits(&gb, 1); /* nuit_field_based_flag */
	counting_type = get_bits(&gb, 5); /* counting_type */
	full_timestamp_flag = get_bits(&gb, 1);
	skip_bits(&gb, 1); /* discontinuity_flag */
	cnt_dropped_flag = get_bits(&gb, 1); /* cnt_dropped_flag */
	if (cnt_dropped_flag && counting_type > 1 && counting_type < 7)
	tc->dropframe = 1;
	tc->frame = get_bits(&gb, 8); /* n_frames */
	if (full_timestamp_flag) {
	tc->full = 1;
	tc->seconds = get_bits(&gb, 6); /* seconds_value 0..59 */
	tc->minutes = get_bits(&gb, 6); /* minutes_value 0..59 */
	tc->hours = get_bits(&gb, 5); /* hours_value 0..23 */
	} else {
	tc->seconds = tc->minutes = tc->hours = tc->full = 0;
	if (get_bits(&gb, 1)) { /* seconds_flag */
	tc->seconds = get_bits(&gb, 6);
	if (get_bits(&gb, 1)) { /* minutes_flag */
	tc->minutes = get_bits(&gb, 6);
	if (get_bits(&gb, 1)) /* hours_flag */
	tc->hours = get_bits(&gb, 5);
	}
	}
	}

	if (sps->time_offset_length > 0)
	skip_bits(&gb,
	sps->time_offset_length); /* time_offset */
	}
	}

	av_log(logctx, AV_LOG_DEBUG, "ct_type:%X pic_struct:%d\n",
	h->ct_type, h->pic_struct);
	}

	return 0;
	}

	static int decode_picture_timing(H264SEIPictureTiming h, GetByteContext gb,
	void *logctx)
	{
	int size = bytestream2_get_bytes_left(gb);

	if (size > sizeof(h->payload)) {
	av_log(logctx, AV_LOG_ERROR, "Picture timing SEI payload too large\n");
	return AVERROR_INVALIDDATA;
	}
	bytestream2_get_bufferu(gb, h->payload, size);

	h->payload_size_bytes = size;

	h->present = 1;
	return 0;
	}

	static int decode_recovery_point(H264SEIRecoveryPoint h, GetBitContext gb, void *logctx)
	{
	unsigned recovery_frame_cnt = get_ue_golomb_long(gb);

	if (recovery_frame_cnt >= (1<<MAX_LOG2_MAX_FRAME_NUM)) {
	av_log(logctx, AV_LOG_ERROR, "recovery_frame_cnt %u is out of range\n", recovery_frame_cnt);
	return AVERROR_INVALIDDATA;
	}

	h->recovery_frame_cnt = recovery_frame_cnt;
	/* 1b exact_match_flag,
	* 1b broken_link_flag,
	* 2b changing_slice_group_idc */
	skip_bits(gb, 4);

	return 0;
	}

	static int decode_buffering_period(H264SEIBufferingPeriod h, GetBitContext gb,
	const H264ParamSets ps, void logctx)
	{
	unsigned int sps_id;
	int sched_sel_idx;
	const SPS *sps;

	sps_id = get_ue_golomb_31(gb);
	if (sps_id > 31 \|\| !ps->sps_list[sps_id]) {
	av_log(logctx, AV_LOG_ERROR,
	"non-existing SPS %d referenced in buffering period\n", sps_id);
	return sps_id > 31 ? AVERROR_INVALIDDATA : AVERROR_PS_NOT_FOUND;
	}
	sps = ps->sps_list[sps_id];

	// NOTE: This is really so duplicated in the standard... See H.264, D.1.1
	if (sps->nal_hrd_parameters_present_flag) {
	for (sched_sel_idx = 0; sched_sel_idx < sps->cpb_cnt; sched_sel_idx++) {
	h->initial_cpb_removal_delay[sched_sel_idx] =
	get_bits_long(gb, sps->initial_cpb_removal_delay_length);
	// initial_cpb_removal_delay_offset
	skip_bits(gb, sps->initial_cpb_removal_delay_length);
	}
	}
	if (sps->vcl_hrd_parameters_present_flag) {
	for (sched_sel_idx = 0; sched_sel_idx < sps->cpb_cnt; sched_sel_idx++) {
	h->initial_cpb_removal_delay[sched_sel_idx] =
	get_bits_long(gb, sps->initial_cpb_removal_delay_length);
	// initial_cpb_removal_delay_offset
	skip_bits(gb, sps->initial_cpb_removal_delay_length);
	}
	}

	h->present = 1;
	return 0;
	}

	static int decode_green_metadata(H264SEIGreenMetaData h, GetByteContext gb)
	{
	h->green_metadata_type = bytestream2_get_byte(gb);

	if (h->green_metadata_type == 0) {
	h->period_type = bytestream2_get_byte(gb);

	if (h->period_type == 2)
	h->num_seconds = bytestream2_get_be16(gb);
	else if (h->period_type == 3)
	h->num_pictures = bytestream2_get_be16(gb);

	h->percent_non_zero_macroblocks = bytestream2_get_byte(gb);
	h->percent_intra_coded_macroblocks = bytestream2_get_byte(gb);
	h->percent_six_tap_filtering = bytestream2_get_byte(gb);
	h->percent_alpha_point_deblocking_instance = bytestream2_get_byte(gb);

	} else if (h->green_metadata_type == 1) {
	h->xsd_metric_type = bytestream2_get_byte(gb);
	h->xsd_metric_value = bytestream2_get_be16(gb);
	}

	return 0;
	}

	int ff_h264_sei_decode(H264SEIContext h, GetBitContext gb,
	const H264ParamSets ps, void logctx)
	{
	GetByteContext gbyte;
	int master_ret = 0;

	av_assert1((get_bits_count(gb) % 8) == 0);
	bytestream2_init(&gbyte, gb->buffer + get_bits_count(gb) / 8,
	get_bits_left(gb) / 8);

	while (bytestream2_get_bytes_left(&gbyte) > 2 && bytestream2_peek_ne16(&gbyte)) {
	GetByteContext gbyte_payload;
	GetBitContext gb_payload;
	int type = 0;
	unsigned size = 0;
	int ret = 0;

	do {
	if (bytestream2_get_bytes_left(&gbyte) <= 0)
	return AVERROR_INVALIDDATA;
	type += bytestream2_peek_byteu(&gbyte);
	} while (bytestream2_get_byteu(&gbyte) == 255);

	do {
	if (bytestream2_get_bytes_left(&gbyte) <= 0)
	return AVERROR_INVALIDDATA;
	size += bytestream2_peek_byteu(&gbyte);
	} while (bytestream2_get_byteu(&gbyte) == 255);

	if (size > bytestream2_get_bytes_left(&gbyte)) {
	av_log(logctx, AV_LOG_ERROR, "SEI type %d size %d truncated at %d\n",
	type, size, bytestream2_get_bytes_left(&gbyte));
	return AVERROR_INVALIDDATA;
	}

	bytestream2_init (&gbyte_payload, gbyte.buffer, size);
	ret = init_get_bits8(&gb_payload, gbyte.buffer, size);
	if (ret < 0)
	return ret;

	switch (type) {
	case SEI_TYPE_PIC_TIMING: // Picture timing SEI
	ret = decode_picture_timing(&h->picture_timing, &gbyte_payload, logctx);
	break;
	case SEI_TYPE_RECOVERY_POINT:
	ret = decode_recovery_point(&h->recovery_point, &gb_payload, logctx);
	break;
	case SEI_TYPE_BUFFERING_PERIOD:
	ret = decode_buffering_period(&h->buffering_period, &gb_payload, ps, logctx);
	break;
	case SEI_TYPE_GREEN_METADATA:
	ret = decode_green_metadata(&h->green_metadata, &gbyte_payload);
	break;
	default:
	ret = ff_h2645_sei_message_decode(&h->common, type, AV_CODEC_ID_H264,
	&gb_payload, &gbyte_payload, logctx);
	if (ret == FF_H2645_SEI_MESSAGE_UNHANDLED)
	av_log(logctx, AV_LOG_DEBUG, "unknown SEI type %d\n", type);
	}
	if (ret < 0 && ret != AVERROR_PS_NOT_FOUND)
	return ret;
	if (ret < 0)
	master_ret = ret;

	if (get_bits_left(&gb_payload) < 0) {
	av_log(logctx, AV_LOG_WARNING, "SEI type %d overread by %d bits\n",
	type, -get_bits_left(&gb_payload));
	}

	bytestream2_skipu(&gbyte, size);
	}

	return master_ret;
	}

	const char ff_h264_sei_stereo_mode(const H2645SEIFramePacking h)
	{
	if (h->arrangement_cancel_flag == 0) {
	switch (h->arrangement_type) {
	case SEI_FPA_H264_TYPE_CHECKERBOARD:
	if (h->content_interpretation_type == 2)
	return "checkerboard_rl";
	else
	return "checkerboard_lr";
	case SEI_FPA_H264_TYPE_INTERLEAVE_COLUMN:
	if (h->content_interpretation_type == 2)
	return "col_interleaved_rl";
	else
	return "col_interleaved_lr";
	case SEI_FPA_H264_TYPE_INTERLEAVE_ROW:
	if (h->content_interpretation_type == 2)
	return "row_interleaved_rl";
	else
	return "row_interleaved_lr";
	case SEI_FPA_TYPE_SIDE_BY_SIDE:
	if (h->content_interpretation_type == 2)
	return "right_left";
	else
	return "left_right";
	case SEI_FPA_TYPE_TOP_BOTTOM:
	if (h->content_interpretation_type == 2)
	return "bottom_top";
	else
	return "top_bottom";
	case SEI_FPA_TYPE_INTERLEAVE_TEMPORAL:
	if (h->content_interpretation_type == 2)
	return "block_rl";
	else
	return "block_lr";
	case SEI_FPA_H264_TYPE_2D:
	default:
	return "mono";
	}
	} else if (h->arrangement_cancel_flag == 1) {
	return "mono";
	} else {
	return NULL;
	}
	}