/src/ffmpeg/libavcodec/h264_sei.c

Source
/*
 * 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.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;
    }
}

Coverage Report

Created: 2025-11-16 07:20

Line	Count	Source
1		/*
2		* H.26L/H.264/AVC/JVT/14496-10/... SEI decoding
3		* Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
4		*
5		* This file is part of FFmpeg.
6		*
7		* FFmpeg is free software; you can redistribute it and/or
8		* modify it under the terms of the GNU Lesser General Public
9		* License as published by the Free Software Foundation; either
10		* version 2.1 of the License, or (at your option) any later version.
11		*
12		* FFmpeg is distributed in the hope that it will be useful,
13		* but WITHOUT ANY WARRANTY; without even the implied warranty of
14		* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15		* Lesser General Public License for more details.
16		*
17		* You should have received a copy of the GNU Lesser General Public
18		* License along with FFmpeg; if not, write to the Free Software
19		* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20		*/
21
22		/**
23		* @file
24		* H.264 / AVC / MPEG-4 part10 SEI decoding.
25		* @author Michael Niedermayer <michaelni@gmx.at>
26		*/
27
28		#include <limits.h>
29		#include <stdio.h>
30		#include <string.h>
31		#include "libavutil/error.h"
32		#include "libavutil/log.h"
33		#include "libavutil/macros.h"
34		#include "libavutil/mem.h"
35		#include "bytestream.h"
36		#include "get_bits.h"
37		#include "golomb.h"
38		#include "h264_ps.h"
39		#include "h264_sei.h"
40		#include "sei.h"
41
42	282k	#define AVERROR_PS_NOT_FOUND FFERRTAG(0xF8,'?','P','S')
43
44		static const uint8_t sei_num_clock_ts_table[9] = {
45		1, 1, 1, 2, 2, 3, 3, 2, 3
46		};
47
48		void ff_h264_sei_uninit(H264SEIContext *h)
49	9.14M	{
50	9.14M	h->recovery_point.recovery_frame_cnt = -1;
51
52	9.14M	h->picture_timing.dpb_output_delay = 0;
53	9.14M	h->picture_timing.cpb_removal_delay = -1;
54
55	9.14M	h->picture_timing.present = 0;
56	9.14M	h->buffering_period.present = 0;
57	9.14M	h->common.frame_packing.present = 0;
58	9.14M	h->common.display_orientation.present = 0;
59	9.14M	h->common.afd.present = 0;
60
61	9.14M	ff_h2645_sei_reset(&h->common);
62	9.14M	}
63
64		int ff_h264_sei_process_picture_timing(H264SEIPictureTiming h, const SPS sps,
65		void *logctx)
66	268k	{
67	268k	GetBitContext gb;
68	268k	av_unused int ret;
69
70	268k	ret = init_get_bits8(&gb, h->payload, h->payload_size_bytes);
71	268k	av_assert1(ret >= 0);
72
73	268k	if (sps->nal_hrd_parameters_present_flag \|\|
74	157k	sps->vcl_hrd_parameters_present_flag) {
75	157k	h->cpb_removal_delay = get_bits_long(&gb, sps->cpb_removal_delay_length);
76	157k	h->dpb_output_delay = get_bits_long(&gb, sps->dpb_output_delay_length);
77	157k	}
78	268k	if (sps->pic_struct_present_flag) {
79	170k	unsigned int i, num_clock_ts;
80
81	170k	h->pic_struct = get_bits(&gb, 4);
82	170k	h->ct_type = 0;
83
84	170k	if (h->pic_struct > H264_SEI_PIC_STRUCT_FRAME_TRIPLING)
85	8.45k	return AVERROR_INVALIDDATA;
86
87	161k	num_clock_ts = sei_num_clock_ts_table[h->pic_struct];
88	161k	h->timecode_cnt = 0;
89	466k	for (i = 0; i < num_clock_ts; i++) {
90	304k	if (get_bits(&gb, 1)) { /* clock_timestamp_flag */
91	123k	H264SEITimeCode *tc = &h->timecode[h->timecode_cnt++];
92	123k	unsigned int full_timestamp_flag;
93	123k	unsigned int counting_type, cnt_dropped_flag;
94	123k	h->ct_type \|= 1 << get_bits(&gb, 2);
95	123k	skip_bits(&gb, 1); /* nuit_field_based_flag */
96	123k	counting_type = get_bits(&gb, 5); /* counting_type */
97	123k	full_timestamp_flag = get_bits(&gb, 1);
98	123k	skip_bits(&gb, 1); /* discontinuity_flag */
99	123k	cnt_dropped_flag = get_bits(&gb, 1); /* cnt_dropped_flag */
100	123k	if (cnt_dropped_flag && counting_type > 1 && counting_type < 7)
101	25.2k	tc->dropframe = 1;
102	123k	tc->frame = get_bits(&gb, 8); /* n_frames */
103	123k	if (full_timestamp_flag) {
104	36.5k	tc->full = 1;
105	36.5k	tc->seconds = get_bits(&gb, 6); /* seconds_value 0..59 */
106	36.5k	tc->minutes = get_bits(&gb, 6); /* minutes_value 0..59 */
107	36.5k	tc->hours = get_bits(&gb, 5); /* hours_value 0..23 */
108	87.0k	} else {
109	87.0k	tc->seconds = tc->minutes = tc->hours = tc->full = 0;
110	87.0k	if (get_bits(&gb, 1)) { /* seconds_flag */
111	19.7k	tc->seconds = get_bits(&gb, 6);
112	19.7k	if (get_bits(&gb, 1)) { /* minutes_flag */
113	15.2k	tc->minutes = get_bits(&gb, 6);
114	15.2k	if (get_bits(&gb, 1)) /* hours_flag */
115	9.75k	tc->hours = get_bits(&gb, 5);
116	15.2k	}
117	19.7k	}
118	87.0k	}
119
120	123k	if (sps->time_offset_length > 0)
121	119k	skip_bits(&gb,
122	119k	sps->time_offset_length); /* time_offset */
123	123k	}
124	304k	}
125
126	161k	av_log(logctx, AV_LOG_DEBUG, "ct_type:%X pic_struct:%d\n",
127	161k	h->ct_type, h->pic_struct);
128	161k	}
129
130	260k	return 0;
131	268k	}
132
133		static int decode_picture_timing(H264SEIPictureTiming h, GetByteContext gb,
134		void *logctx)
135	466k	{
136	466k	int size = bytestream2_get_bytes_left(gb);
137
138	466k	if (size > sizeof(h->payload)) {
139	7.90k	av_log(logctx, AV_LOG_ERROR, "Picture timing SEI payload too large\n");
140	7.90k	return AVERROR_INVALIDDATA;
141	7.90k	}
142	458k	bytestream2_get_bufferu(gb, h->payload, size);
143
144	458k	h->payload_size_bytes = size;
145
146	458k	h->present = 1;
147	458k	return 0;
148	466k	}
149
150		static int decode_recovery_point(H264SEIRecoveryPoint h, GetBitContext gb, void *logctx)
151	143k	{
152	143k	unsigned recovery_frame_cnt = get_ue_golomb_long(gb);
153
154	143k	if (recovery_frame_cnt >= (1<<MAX_LOG2_MAX_FRAME_NUM)) {
155	5.53k	av_log(logctx, AV_LOG_ERROR, "recovery_frame_cnt %u is out of range\n", recovery_frame_cnt);
156	5.53k	return AVERROR_INVALIDDATA;
157	5.53k	}
158
159	138k	h->recovery_frame_cnt = recovery_frame_cnt;
160		/* 1b exact_match_flag,
161		* 1b broken_link_flag,
162		* 2b changing_slice_group_idc */
163	138k	skip_bits(gb, 4);
164
165	138k	return 0;
166	143k	}
167
168		static int decode_buffering_period(H264SEIBufferingPeriod h, GetBitContext gb,
169		const H264ParamSets ps, void logctx)
170	270k	{
171	270k	unsigned int sps_id;
172	270k	int sched_sel_idx;
173	270k	const SPS *sps;
174
175	270k	sps_id = get_ue_golomb_31(gb);
176	270k	if (sps_id > 31 \|\| !ps->sps_list[sps_id]) {
177	115k	av_log(logctx, AV_LOG_ERROR,
178	115k	"non-existing SPS %d referenced in buffering period\n", sps_id);
179	115k	return sps_id > 31 ? AVERROR_INVALIDDATA : AVERROR_PS_NOT_FOUND;
180	115k	}
181	155k	sps = ps->sps_list[sps_id];
182
183		// NOTE: This is really so duplicated in the standard... See H.264, D.1.1
184	155k	if (sps->nal_hrd_parameters_present_flag) {
185	340k	for (sched_sel_idx = 0; sched_sel_idx < sps->cpb_cnt; sched_sel_idx++) {
186	269k	h->initial_cpb_removal_delay[sched_sel_idx] =
187	269k	get_bits_long(gb, sps->initial_cpb_removal_delay_length);
188		// initial_cpb_removal_delay_offset
189	269k	skip_bits(gb, sps->initial_cpb_removal_delay_length);
190	269k	}
191	70.9k	}
192	155k	if (sps->vcl_hrd_parameters_present_flag) {
193	351k	for (sched_sel_idx = 0; sched_sel_idx < sps->cpb_cnt; sched_sel_idx++) {
194	277k	h->initial_cpb_removal_delay[sched_sel_idx] =
195	277k	get_bits_long(gb, sps->initial_cpb_removal_delay_length);
196		// initial_cpb_removal_delay_offset
197	277k	skip_bits(gb, sps->initial_cpb_removal_delay_length);
198	277k	}
199	73.7k	}
200
201	155k	h->present = 1;
202	155k	return 0;
203	270k	}
204
205		static int decode_green_metadata(H264SEIGreenMetaData h, GetByteContext gb)
206	58.9k	{
207	58.9k	h->green_metadata_type = bytestream2_get_byte(gb);
208
209	58.9k	if (h->green_metadata_type == 0) {
210	33.9k	h->period_type = bytestream2_get_byte(gb);
211
212	33.9k	if (h->period_type == 2)
213	8.36k	h->num_seconds = bytestream2_get_be16(gb);
214	25.5k	else if (h->period_type == 3)
215	11.2k	h->num_pictures = bytestream2_get_be16(gb);
216
217	33.9k	h->percent_non_zero_macroblocks = bytestream2_get_byte(gb);
218	33.9k	h->percent_intra_coded_macroblocks = bytestream2_get_byte(gb);
219	33.9k	h->percent_six_tap_filtering = bytestream2_get_byte(gb);
220	33.9k	h->percent_alpha_point_deblocking_instance = bytestream2_get_byte(gb);
221
222	33.9k	} else if (h->green_metadata_type == 1) {
223	11.7k	h->xsd_metric_type = bytestream2_get_byte(gb);
224	11.7k	h->xsd_metric_value = bytestream2_get_be16(gb);
225	11.7k	}
226
227	58.9k	return 0;
228	58.9k	}
229
230		int ff_h264_sei_decode(H264SEIContext h, GetBitContext gb,
231		const H264ParamSets ps, void logctx)
232	1.03M	{
233	1.03M	GetByteContext gbyte;
234	1.03M	int master_ret = 0;
235
236	1.03M	av_assert1((get_bits_count(gb) % 8) == 0);
237	1.03M	bytestream2_init(&gbyte, gb->buffer + get_bits_count(gb) / 8,
238	1.03M	get_bits_left(gb) / 8);
239
240	3.67M	while (bytestream2_get_bytes_left(&gbyte) > 2 && bytestream2_peek_ne16(&gbyte)) {
241	3.34M	GetByteContext gbyte_payload;
242	3.34M	GetBitContext gb_payload;
243	3.34M	int type = 0;
244	3.34M	unsigned size = 0;
245	3.34M	int ret = 0;
246
247	5.58M	do {
248	5.58M	if (bytestream2_get_bytes_left(&gbyte) <= 0)
249	9.51k	return AVERROR_INVALIDDATA;
250	5.58M	type += bytestream2_peek_byteu(&gbyte);
251	5.58M	} while (bytestream2_get_byteu(&gbyte) == 255);
252
253	3.89M	do {
254	3.89M	if (bytestream2_get_bytes_left(&gbyte) <= 0)
255	12.7k	return AVERROR_INVALIDDATA;
256	3.88M	size += bytestream2_peek_byteu(&gbyte);
257	3.88M	} while (bytestream2_get_byteu(&gbyte) == 255);
258
259	3.32M	if (size > bytestream2_get_bytes_left(&gbyte)) {
260	571k	av_log(logctx, AV_LOG_ERROR, "SEI type %d size %d truncated at %d\n",
261	571k	type, size, bytestream2_get_bytes_left(&gbyte));
262	571k	return AVERROR_INVALIDDATA;
263	571k	}
264
265	2.75M	bytestream2_init (&gbyte_payload, gbyte.buffer, size);
266	2.75M	ret = init_get_bits8(&gb_payload, gbyte.buffer, size);
267	2.75M	if (ret < 0)
268	0	return ret;
269
270	2.75M	switch (type) {
271	466k	case SEI_TYPE_PIC_TIMING: // Picture timing SEI
272	466k	ret = decode_picture_timing(&h->picture_timing, &gbyte_payload, logctx);
273	466k	break;
274	143k	case SEI_TYPE_RECOVERY_POINT:
275	143k	ret = decode_recovery_point(&h->recovery_point, &gb_payload, logctx);
276	143k	break;
277	270k	case SEI_TYPE_BUFFERING_PERIOD:
278	270k	ret = decode_buffering_period(&h->buffering_period, &gb_payload, ps, logctx);
279	270k	break;
280	58.9k	case SEI_TYPE_GREEN_METADATA:
281	58.9k	ret = decode_green_metadata(&h->green_metadata, &gbyte_payload);
282	58.9k	break;
283	1.81M	default:
284	1.81M	ret = ff_h2645_sei_message_decode(&h->common, type, AV_CODEC_ID_H264,
285	1.81M	&gb_payload, &gbyte_payload, logctx);
286	1.81M	if (ret == FF_H2645_SEI_MESSAGE_UNHANDLED)
287	1.28M	av_log(logctx, AV_LOG_DEBUG, "unknown SEI type %d\n", type);
288	2.75M	}
289	2.75M	if (ret < 0 && ret != AVERROR_PS_NOT_FOUND)
290	106k	return ret;
291	2.64M	if (ret < 0)
292	87.9k	master_ret = ret;
293
294	2.64M	if (get_bits_left(&gb_payload) < 0) {
295	242k	av_log(logctx, AV_LOG_WARNING, "SEI type %d overread by %d bits\n",
296	242k	type, -get_bits_left(&gb_payload));
297	242k	}
298
299	2.64M	bytestream2_skipu(&gbyte, size);
300	2.64M	}
301
302	331k	return master_ret;
303	1.03M	}
304
305		const char ff_h264_sei_stereo_mode(const H2645SEIFramePacking h)
306	685k	{
307	685k	if (h->arrangement_cancel_flag == 0) {
308	44.0k	switch (h->arrangement_type) {
309	15.0k	case SEI_FPA_H264_TYPE_CHECKERBOARD:
310	15.0k	if (h->content_interpretation_type == 2)
311	5.78k	return "checkerboard_rl";
312	9.27k	else
313	9.27k	return "checkerboard_lr";
314	3.11k	case SEI_FPA_H264_TYPE_INTERLEAVE_COLUMN:
315	3.11k	if (h->content_interpretation_type == 2)
316	331	return "col_interleaved_rl";
317	2.78k	else
318	2.78k	return "col_interleaved_lr";
319	1.57k	case SEI_FPA_H264_TYPE_INTERLEAVE_ROW:
320	1.57k	if (h->content_interpretation_type == 2)
321	1.16k	return "row_interleaved_rl";
322	408	else
323	408	return "row_interleaved_lr";
324	11.1k	case SEI_FPA_TYPE_SIDE_BY_SIDE:
325	11.1k	if (h->content_interpretation_type == 2)
326	3.74k	return "right_left";
327	7.37k	else
328	7.37k	return "left_right";
329	5.94k	case SEI_FPA_TYPE_TOP_BOTTOM:
330	5.94k	if (h->content_interpretation_type == 2)
331	4.59k	return "bottom_top";
332	1.35k	else
333	1.35k	return "top_bottom";
334	4.48k	case SEI_FPA_TYPE_INTERLEAVE_TEMPORAL:
335	4.48k	if (h->content_interpretation_type == 2)
336	3.83k	return "block_rl";
337	658	else
338	658	return "block_lr";
339	45	case SEI_FPA_H264_TYPE_2D:
340	2.76k	default:
341	2.76k	return "mono";
342	44.0k	}
343	641k	} else if (h->arrangement_cancel_flag == 1) {
344	42.8k	return "mono";
345	598k	} else {
346		return NULL;
347	598k	}
348	685k	}