[deb_ffmpeg.git] / ffmpeg / libavcodec / h264_sei.c

/*
 * 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 / MPEG4 part10 sei decoding.
 * @author Michael Niedermayer <michaelni@gmx.at>
 */

#include "avcodec.h"
#include "golomb.h"
#include "h264.h"
#include "internal.h"

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

void ff_h264_reset_sei(H264Context *h)
{
    h->sei_recovery_frame_cnt       = -1;
    h->sei_dpb_output_delay         =  0;
    h->sei_cpb_removal_delay        = -1;
    h->sei_buffering_period_present =  0;
    h->sei_frame_packing_present    =  0;
    h->sei_display_orientation_present = 0;
}

static int decode_picture_timing(H264Context *h)
{
    SPS *sps = &h->sps;
    int i;

    for (i = 0; i<MAX_SPS_COUNT; i++)
        if (!sps->log2_max_frame_num && h->sps_buffers[i])
            sps = h->sps_buffers[i];

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

        h->sei_pic_struct = get_bits(&h->gb, 4);
        h->sei_ct_type    = 0;

        if (h->sei_pic_struct > SEI_PIC_STRUCT_FRAME_TRIPLING)
            return AVERROR_INVALIDDATA;

        num_clock_ts = sei_num_clock_ts_table[h->sei_pic_struct];

        for (i = 0; i < num_clock_ts; i++) {
            if (get_bits(&h->gb, 1)) {                /* clock_timestamp_flag */
                unsigned int full_timestamp_flag;

                h->sei_ct_type |= 1 << get_bits(&h->gb, 2);
                skip_bits(&h->gb, 1);                 /* nuit_field_based_flag */
                skip_bits(&h->gb, 5);                 /* counting_type */
                full_timestamp_flag = get_bits(&h->gb, 1);
                skip_bits(&h->gb, 1);                 /* discontinuity_flag */
                skip_bits(&h->gb, 1);                 /* cnt_dropped_flag */
                skip_bits(&h->gb, 8);                 /* n_frames */
                if (full_timestamp_flag) {
                    skip_bits(&h->gb, 6);             /* seconds_value 0..59 */
                    skip_bits(&h->gb, 6);             /* minutes_value 0..59 */
                    skip_bits(&h->gb, 5);             /* hours_value 0..23 */
                } else {
                    if (get_bits(&h->gb, 1)) {        /* seconds_flag */
                        skip_bits(&h->gb, 6);         /* seconds_value range 0..59 */
                        if (get_bits(&h->gb, 1)) {    /* minutes_flag */
                            skip_bits(&h->gb, 6);     /* minutes_value 0..59 */
                            if (get_bits(&h->gb, 1))  /* hours_flag */
                                skip_bits(&h->gb, 5); /* hours_value 0..23 */
                        }
                    }
                }
                if (sps->time_offset_length > 0)
                    skip_bits(&h->gb,
                              sps->time_offset_length); /* time_offset */
            }
        }

        if (h->avctx->debug & FF_DEBUG_PICT_INFO)
            av_log(h->avctx, AV_LOG_DEBUG, "ct_type:%X pic_struct:%d\n",
                   h->sei_ct_type, h->sei_pic_struct);
    }
    return 0;
}

static int decode_user_data_itu_t_t35(H264Context *h, int size)
{
    uint32_t user_identifier;
    int dtg_active_format;

    if (size < 7)
        return -1;
    size -= 7;

    skip_bits(&h->gb, 8);   // country_code
    skip_bits(&h->gb, 16);  // provider_code
    user_identifier = get_bits_long(&h->gb, 32);

    switch (user_identifier) {
        case 0x44544731:    // "DTG1" - AFD_data
            if (size < 1)
                return -1;
            skip_bits(&h->gb, 1);
            if (get_bits(&h->gb, 1)) {
                skip_bits(&h->gb, 6);
                if (size < 2)
                    return -1;
                skip_bits(&h->gb, 4);
                dtg_active_format = get_bits(&h->gb, 4);
                h->avctx->dtg_active_format = dtg_active_format;
            } else {
                skip_bits(&h->gb, 6);
            }
            break;
        default:
            skip_bits(&h->gb, size * 8);
            break;
    }

    return 0;
}

static int decode_unregistered_user_data(H264Context *h, int size)
{
    uint8_t user_data[16 + 256];
    int e, build, i;

    if (size < 16)
        return AVERROR_INVALIDDATA;

    for (i = 0; i < sizeof(user_data) - 1 && i < size; i++)
        user_data[i] = get_bits(&h->gb, 8);

    user_data[i] = 0;
    e = sscanf(user_data + 16, "x264 - core %d", &build);
    if (e == 1 && build > 0)
        h->x264_build = build;
    if (e == 1 && build == 1 && !strncmp(user_data+16, "x264 - core 0000", 16))
        h->x264_build = 67;

    if (h->avctx->debug & FF_DEBUG_BUGS)
        av_log(h->avctx, AV_LOG_DEBUG, "user data:\"%s\"\n", user_data + 16);

    for (; i < size; i++)
        skip_bits(&h->gb, 8);

    return 0;
}

static int decode_recovery_point(H264Context *h)
{
    h->sei_recovery_frame_cnt = get_ue_golomb(&h->gb);

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

    if (h->avctx->debug & FF_DEBUG_PICT_INFO)
        av_log(h->avctx, AV_LOG_DEBUG, "sei_recovery_frame_cnt: %d\n", h->sei_recovery_frame_cnt);

    h->has_recovery_point = 1;

    return 0;
}

static int decode_buffering_period(H264Context *h)
{
    unsigned int sps_id;
    int sched_sel_idx;
    SPS *sps;

    sps_id = get_ue_golomb_31(&h->gb);
    if (sps_id > 31 || !h->sps_buffers[sps_id]) {
        av_log(h->avctx, AV_LOG_ERROR,
               "non-existing SPS %d referenced in buffering period\n", sps_id);
        return AVERROR_INVALIDDATA;
    }
    sps = h->sps_buffers[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(&h->gb, sps->initial_cpb_removal_delay_length);
            // initial_cpb_removal_delay_offset
            skip_bits(&h->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(&h->gb, sps->initial_cpb_removal_delay_length);
            // initial_cpb_removal_delay_offset
            skip_bits(&h->gb, sps->initial_cpb_removal_delay_length);
        }
    }

    h->sei_buffering_period_present = 1;
    return 0;
}

static int decode_frame_packing_arrangement(H264Context *h)
{
    h->sei_fpa.frame_packing_arrangement_id          = get_ue_golomb(&h->gb);
    h->sei_fpa.frame_packing_arrangement_cancel_flag = get_bits1(&h->gb);
    h->sei_frame_packing_present = !h->sei_fpa.frame_packing_arrangement_cancel_flag;

    if (h->sei_frame_packing_present) {
        h->sei_fpa.frame_packing_arrangement_type =
        h->frame_packing_arrangement_type = get_bits(&h->gb, 7);
        h->sei_fpa.quincunx_sampling_flag         =
        h->quincunx_subsampling           = get_bits1(&h->gb);
        h->sei_fpa.content_interpretation_type    =
        h->content_interpretation_type    = get_bits(&h->gb, 6);

        // the following skips: spatial_flipping_flag, frame0_flipped_flag,
        // field_views_flag, current_frame_is_frame0_flag,
        // frame0_self_contained_flag, frame1_self_contained_flag
        skip_bits(&h->gb, 6);

        if (!h->quincunx_subsampling && h->frame_packing_arrangement_type != 5)
            skip_bits(&h->gb, 16);      // frame[01]_grid_position_[xy]
        skip_bits(&h->gb, 8);           // frame_packing_arrangement_reserved_byte
        h->sei_fpa.frame_packing_arrangement_repetition_period = get_ue_golomb(&h->gb) /* frame_packing_arrangement_repetition_period */;
    }
    skip_bits1(&h->gb);                 // frame_packing_arrangement_extension_flag

    if (h->avctx->debug & FF_DEBUG_PICT_INFO)
        av_log(h->avctx, AV_LOG_DEBUG, "SEI FPA %d %d %d %d %d %d\n",
                                       h->sei_fpa.frame_packing_arrangement_id,
                                       h->sei_fpa.frame_packing_arrangement_cancel_flag,
                                       h->sei_fpa.frame_packing_arrangement_type,
                                       h->sei_fpa.quincunx_sampling_flag,
                                       h->sei_fpa.content_interpretation_type,
                                       h->sei_fpa.frame_packing_arrangement_repetition_period);

    return 0;
}

static int decode_display_orientation(H264Context *h)
{
    h->sei_display_orientation_present = !get_bits1(&h->gb);

    if (h->sei_display_orientation_present) {
        h->sei_hflip = get_bits1(&h->gb);     // hor_flip
        h->sei_vflip = get_bits1(&h->gb);     // ver_flip

        h->sei_anticlockwise_rotation = get_bits(&h->gb, 16);
        get_ue_golomb(&h->gb);  // display_orientation_repetition_period
        skip_bits1(&h->gb);     // display_orientation_extension_flag
    }

    return 0;
}

int ff_h264_decode_sei(H264Context *h)
{
    while (get_bits_left(&h->gb) > 16 && show_bits(&h->gb, 16)) {
        int type = 0;
        unsigned size = 0;
        unsigned next;
        int ret  = 0;

        do {
            if (get_bits_left(&h->gb) < 8)
                return AVERROR_INVALIDDATA;
            type += show_bits(&h->gb, 8);
        } while (get_bits(&h->gb, 8) == 255);

        do {
            if (get_bits_left(&h->gb) < 8)
                return AVERROR_INVALIDDATA;
            size += show_bits(&h->gb, 8);
        } while (get_bits(&h->gb, 8) == 255);

        if (h->avctx->debug&FF_DEBUG_STARTCODE)
            av_log(h->avctx, AV_LOG_DEBUG, "SEI %d len:%d\n", type, size);

        if (size > get_bits_left(&h->gb) / 8) {
            av_log(h->avctx, AV_LOG_ERROR, "SEI type %d size %d truncated at %d\n",
                   type, 8*size, get_bits_left(&h->gb));
            return AVERROR_INVALIDDATA;
        }
        next = get_bits_count(&h->gb) + 8 * size;

        switch (type) {
        case SEI_TYPE_PIC_TIMING: // Picture timing SEI
            ret = decode_picture_timing(h);
            if (ret < 0)
                return ret;
            break;
        case SEI_TYPE_USER_DATA_ITU_T_T35:
            if (decode_user_data_itu_t_t35(h, size) < 0)
                return -1;
            break;
        case SEI_TYPE_USER_DATA_UNREGISTERED:
            ret = decode_unregistered_user_data(h, size);
            if (ret < 0)
                return ret;
            break;
        case SEI_TYPE_RECOVERY_POINT:
            ret = decode_recovery_point(h);
            if (ret < 0)
                return ret;
            break;
        case SEI_TYPE_BUFFERING_PERIOD:
            ret = decode_buffering_period(h);
            if (ret < 0)
                return ret;
            break;
        case SEI_TYPE_FRAME_PACKING:
            ret = decode_frame_packing_arrangement(h);
            if (ret < 0)
                return ret;
            break;
        case SEI_TYPE_DISPLAY_ORIENTATION:
            ret = decode_display_orientation(h);
            if (ret < 0)
                return ret;
            break;
        default:
            av_log(h->avctx, AV_LOG_DEBUG, "unknown SEI type %d\n", type);
        }
        skip_bits_long(&h->gb, next - get_bits_count(&h->gb));

        // FIXME check bits here
        align_get_bits(&h->gb);
    }

    return 0;
}

const char* ff_h264_sei_stereo_mode(H264Context *h)
{
    if (h->sei_fpa.frame_packing_arrangement_cancel_flag == 0) {
        switch (h->sei_fpa.frame_packing_arrangement_type) {
            case SEI_FPA_TYPE_CHECKERBOARD:
                if (h->sei_fpa.content_interpretation_type == 2)
                    return "checkerboard_rl";
                else
                    return "checkerboard_lr";
            case SEI_FPA_TYPE_INTERLEAVE_COLUMN:
                if (h->sei_fpa.content_interpretation_type == 2)
                    return "col_interleaved_rl";
                else
                    return "col_interleaved_lr";
            case SEI_FPA_TYPE_INTERLEAVE_ROW:
                if (h->sei_fpa.content_interpretation_type == 2)
                    return "row_interleaved_rl";
                else
                    return "row_interleaved_lr";
            case SEI_FPA_TYPE_SIDE_BY_SIDE:
                if (h->sei_fpa.content_interpretation_type == 2)
                    return "right_left";
                else
                    return "left_right";
            case SEI_FPA_TYPE_TOP_BOTTOM:
                if (h->sei_fpa.content_interpretation_type == 2)
                    return "bottom_top";
                else
                    return "top_bottom";
            case SEI_FPA_TYPE_INTERLEAVE_TEMPORAL:
                if (h->sei_fpa.content_interpretation_type == 2)
                    return "block_rl";
                else
                    return "block_lr";
            case SEI_FPA_TYPE_2D:
            default:
                return "mono";
        }
    } else if (h->sei_fpa.frame_packing_arrangement_cancel_flag == 1) {
        return "mono";
    } else {
        return NULL;
    }
}
Commit	Line	Data
2ba45a60 DM	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 / MPEG4 part10 sei decoding.
	25	* @author Michael Niedermayer <michaelni@gmx.at>
	26	*/
	27
	28	#include "avcodec.h"
	29	#include "golomb.h"
	30	#include "h264.h"
	31	#include "internal.h"
	32
	33	static const uint8_t sei_num_clock_ts_table[9] = {
	34	1, 1, 1, 2, 2, 3, 3, 2, 3
	35	};
	36
	37	void ff_h264_reset_sei(H264Context *h)
	38	{
	39	h->sei_recovery_frame_cnt = -1;
	40	h->sei_dpb_output_delay = 0;
	41	h->sei_cpb_removal_delay = -1;
	42	h->sei_buffering_period_present = 0;
	43	h->sei_frame_packing_present = 0;
	44	h->sei_display_orientation_present = 0;
	45	}
	46
	47	static int decode_picture_timing(H264Context *h)
	48	{
	49	SPS *sps = &h->sps;
	50	int i;
	51
	52	for (i = 0; i<MAX_SPS_COUNT; i++)
	53	if (!sps->log2_max_frame_num && h->sps_buffers[i])
	54	sps = h->sps_buffers[i];
	55
	56	if (sps->nal_hrd_parameters_present_flag \|\| sps->vcl_hrd_parameters_present_flag) {
	57	h->sei_cpb_removal_delay = get_bits_long(&h->gb,
	58	sps->cpb_removal_delay_length);
	59	h->sei_dpb_output_delay = get_bits_long(&h->gb,
	60	sps->dpb_output_delay_length);
	61	}
	62	if (sps->pic_struct_present_flag) {
	63	unsigned int i, num_clock_ts;
	64
65	h->sei_pic_struct = get_bits(&h->gb, 4);
66	h->sei_ct_type = 0;
67
68	if (h->sei_pic_struct > SEI_PIC_STRUCT_FRAME_TRIPLING)
69	return AVERROR_INVALIDDATA;
70
71	num_clock_ts = sei_num_clock_ts_table[h->sei_pic_struct];
72
73	for (i = 0; i < num_clock_ts; i++) {
74	if (get_bits(&h->gb, 1)) { /* clock_timestamp_flag */
75	unsigned int full_timestamp_flag;
76
77	h->sei_ct_type \|= 1 << get_bits(&h->gb, 2);
78	skip_bits(&h->gb, 1); /* nuit_field_based_flag */
79	skip_bits(&h->gb, 5); /* counting_type */
80	full_timestamp_flag = get_bits(&h->gb, 1);
81	skip_bits(&h->gb, 1); /* discontinuity_flag */
82	skip_bits(&h->gb, 1); /* cnt_dropped_flag */
83	skip_bits(&h->gb, 8); /* n_frames */
84	if (full_timestamp_flag) {
85	skip_bits(&h->gb, 6); /* seconds_value 0..59 */
86	skip_bits(&h->gb, 6); /* minutes_value 0..59 */
87	skip_bits(&h->gb, 5); /* hours_value 0..23 */
88	} else {
89	if (get_bits(&h->gb, 1)) { /* seconds_flag */
90	skip_bits(&h->gb, 6); /* seconds_value range 0..59 */
91	if (get_bits(&h->gb, 1)) { /* minutes_flag */
92	skip_bits(&h->gb, 6); /* minutes_value 0..59 */
93	if (get_bits(&h->gb, 1)) /* hours_flag */
94	skip_bits(&h->gb, 5); /* hours_value 0..23 */
95	}
96	}
97	}
98	if (sps->time_offset_length > 0)
99	skip_bits(&h->gb,
100	sps->time_offset_length); /* time_offset */
101	}
102	}
103
104	if (h->avctx->debug & FF_DEBUG_PICT_INFO)
105	av_log(h->avctx, AV_LOG_DEBUG, "ct_type:%X pic_struct:%d\n",
106	h->sei_ct_type, h->sei_pic_struct);
107	}
108	return 0;
109	}
110
111	static int decode_user_data_itu_t_t35(H264Context *h, int size)
112	{
113	uint32_t user_identifier;
114	int dtg_active_format;
115
116	if (size < 7)
117	return -1;
118	size -= 7;
119
120	skip_bits(&h->gb, 8); // country_code
121	skip_bits(&h->gb, 16); // provider_code
122	user_identifier = get_bits_long(&h->gb, 32);
123
124	switch (user_identifier) {
125	case 0x44544731: // "DTG1" - AFD_data
126	if (size < 1)
127	return -1;
128	skip_bits(&h->gb, 1);
129	if (get_bits(&h->gb, 1)) {
130	skip_bits(&h->gb, 6);
131	if (size < 2)
132	return -1;
133	skip_bits(&h->gb, 4);
134	dtg_active_format = get_bits(&h->gb, 4);
135	h->avctx->dtg_active_format = dtg_active_format;
136	} else {
137	skip_bits(&h->gb, 6);
138	}
139	break;
140	default:
141	skip_bits(&h->gb, size * 8);
142	break;
143	}
144
145	return 0;
146	}
147
148	static int decode_unregistered_user_data(H264Context *h, int size)
149	{
150	uint8_t user_data[16 + 256];
151	int e, build, i;
152
153	if (size < 16)
154	return AVERROR_INVALIDDATA;
155
156	for (i = 0; i < sizeof(user_data) - 1 && i < size; i++)
157	user_data[i] = get_bits(&h->gb, 8);
158
159	user_data[i] = 0;
160	e = sscanf(user_data + 16, "x264 - core %d", &build);
161	if (e == 1 && build > 0)
162	h->x264_build = build;
163	if (e == 1 && build == 1 && !strncmp(user_data+16, "x264 - core 0000", 16))
164	h->x264_build = 67;
165
166	if (h->avctx->debug & FF_DEBUG_BUGS)
167	av_log(h->avctx, AV_LOG_DEBUG, "user data:\"%s\"\n", user_data + 16);
168
169	for (; i < size; i++)
170	skip_bits(&h->gb, 8);
171
172	return 0;
173	}
174
175	static int decode_recovery_point(H264Context *h)
176	{
177	h->sei_recovery_frame_cnt = get_ue_golomb(&h->gb);
178
179	/* 1b exact_match_flag,
180	* 1b broken_link_flag,
181	* 2b changing_slice_group_idc */
182	skip_bits(&h->gb, 4);
183
184	if (h->avctx->debug & FF_DEBUG_PICT_INFO)
185	av_log(h->avctx, AV_LOG_DEBUG, "sei_recovery_frame_cnt: %d\n", h->sei_recovery_frame_cnt);
186
187	h->has_recovery_point = 1;
188
189	return 0;
190	}
191
192	static int decode_buffering_period(H264Context *h)
193	{
194	unsigned int sps_id;
195	int sched_sel_idx;
196	SPS *sps;
197
198	sps_id = get_ue_golomb_31(&h->gb);
199	if (sps_id > 31 \|\| !h->sps_buffers[sps_id]) {
200	av_log(h->avctx, AV_LOG_ERROR,
201	"non-existing SPS %d referenced in buffering period\n", sps_id);
202	return AVERROR_INVALIDDATA;
203	}
204	sps = h->sps_buffers[sps_id];
205
206	// NOTE: This is really so duplicated in the standard... See H.264, D.1.1
207	if (sps->nal_hrd_parameters_present_flag) {
208	for (sched_sel_idx = 0; sched_sel_idx < sps->cpb_cnt; sched_sel_idx++) {
209	h->initial_cpb_removal_delay[sched_sel_idx] =
210	get_bits_long(&h->gb, sps->initial_cpb_removal_delay_length);
211	// initial_cpb_removal_delay_offset
212	skip_bits(&h->gb, sps->initial_cpb_removal_delay_length);
213	}
214	}
215	if (sps->vcl_hrd_parameters_present_flag) {
216	for (sched_sel_idx = 0; sched_sel_idx < sps->cpb_cnt; sched_sel_idx++) {
217	h->initial_cpb_removal_delay[sched_sel_idx] =
218	get_bits_long(&h->gb, sps->initial_cpb_removal_delay_length);
219	// initial_cpb_removal_delay_offset
220	skip_bits(&h->gb, sps->initial_cpb_removal_delay_length);
221	}
222	}
223
224	h->sei_buffering_period_present = 1;
225	return 0;
226	}
227
228	static int decode_frame_packing_arrangement(H264Context *h)
229	{
230	h->sei_fpa.frame_packing_arrangement_id = get_ue_golomb(&h->gb);
231	h->sei_fpa.frame_packing_arrangement_cancel_flag = get_bits1(&h->gb);
232	h->sei_frame_packing_present = !h->sei_fpa.frame_packing_arrangement_cancel_flag;
233
234	if (h->sei_frame_packing_present) {
235	h->sei_fpa.frame_packing_arrangement_type =
236	h->frame_packing_arrangement_type = get_bits(&h->gb, 7);
237	h->sei_fpa.quincunx_sampling_flag =
238	h->quincunx_subsampling = get_bits1(&h->gb);
239	h->sei_fpa.content_interpretation_type =
240	h->content_interpretation_type = get_bits(&h->gb, 6);
241
242	// the following skips: spatial_flipping_flag, frame0_flipped_flag,
243	// field_views_flag, current_frame_is_frame0_flag,
244	// frame0_self_contained_flag, frame1_self_contained_flag
245	skip_bits(&h->gb, 6);
246
247	if (!h->quincunx_subsampling && h->frame_packing_arrangement_type != 5)
248	skip_bits(&h->gb, 16); // frame[01]_grid_position_[xy]
249	skip_bits(&h->gb, 8); // frame_packing_arrangement_reserved_byte
250	h->sei_fpa.frame_packing_arrangement_repetition_period = get_ue_golomb(&h->gb) /* frame_packing_arrangement_repetition_period */;
251	}
252	skip_bits1(&h->gb); // frame_packing_arrangement_extension_flag
253
254	if (h->avctx->debug & FF_DEBUG_PICT_INFO)
255	av_log(h->avctx, AV_LOG_DEBUG, "SEI FPA %d %d %d %d %d %d\n",
256	h->sei_fpa.frame_packing_arrangement_id,
257	h->sei_fpa.frame_packing_arrangement_cancel_flag,
258	h->sei_fpa.frame_packing_arrangement_type,
259	h->sei_fpa.quincunx_sampling_flag,
260	h->sei_fpa.content_interpretation_type,
261	h->sei_fpa.frame_packing_arrangement_repetition_period);
262
263	return 0;
264	}
265
266	static int decode_display_orientation(H264Context *h)
267	{
268	h->sei_display_orientation_present = !get_bits1(&h->gb);
269
270	if (h->sei_display_orientation_present) {
271	h->sei_hflip = get_bits1(&h->gb); // hor_flip
272	h->sei_vflip = get_bits1(&h->gb); // ver_flip
273
274	h->sei_anticlockwise_rotation = get_bits(&h->gb, 16);
275	get_ue_golomb(&h->gb); // display_orientation_repetition_period
276	skip_bits1(&h->gb); // display_orientation_extension_flag
277	}
278
279	return 0;
280	}
281
282	int ff_h264_decode_sei(H264Context *h)
283	{
f6fa7814	284	while (get_bits_left(&h->gb) > 16 && show_bits(&h->gb, 16)) {
2ba45a60 DM	285	int type = 0;
	286	unsigned size = 0;
	287	unsigned next;
	288	int ret = 0;
	289
	290	do {
	291	if (get_bits_left(&h->gb) < 8)
	292	return AVERROR_INVALIDDATA;
	293	type += show_bits(&h->gb, 8);
	294	} while (get_bits(&h->gb, 8) == 255);
	295
	296	do {
	297	if (get_bits_left(&h->gb) < 8)
	298	return AVERROR_INVALIDDATA;
	299	size += show_bits(&h->gb, 8);
	300	} while (get_bits(&h->gb, 8) == 255);
	301
	302	if (h->avctx->debug&FF_DEBUG_STARTCODE)
	303	av_log(h->avctx, AV_LOG_DEBUG, "SEI %d len:%d\n", type, size);
	304
	305	if (size > get_bits_left(&h->gb) / 8) {
	306	av_log(h->avctx, AV_LOG_ERROR, "SEI type %d size %d truncated at %d\n",
	307	type, 8*size, get_bits_left(&h->gb));
	308	return AVERROR_INVALIDDATA;
	309	}
	310	next = get_bits_count(&h->gb) + 8 * size;
	311
	312	switch (type) {
	313	case SEI_TYPE_PIC_TIMING: // Picture timing SEI
	314	ret = decode_picture_timing(h);
	315	if (ret < 0)
	316	return ret;
	317	break;
	318	case SEI_TYPE_USER_DATA_ITU_T_T35:
	319	if (decode_user_data_itu_t_t35(h, size) < 0)
	320	return -1;
	321	break;
	322	case SEI_TYPE_USER_DATA_UNREGISTERED:
	323	ret = decode_unregistered_user_data(h, size);
	324	if (ret < 0)
	325	return ret;
	326	break;
	327	case SEI_TYPE_RECOVERY_POINT:
	328	ret = decode_recovery_point(h);
	329	if (ret < 0)
	330	return ret;
	331	break;
	332	case SEI_TYPE_BUFFERING_PERIOD:
	333	ret = decode_buffering_period(h);
	334	if (ret < 0)
	335	return ret;
	336	break;
	337	case SEI_TYPE_FRAME_PACKING:
	338	ret = decode_frame_packing_arrangement(h);
	339	if (ret < 0)
	340	return ret;
	341	break;
	342	case SEI_TYPE_DISPLAY_ORIENTATION:
	343	ret = decode_display_orientation(h);
	344	if (ret < 0)
	345	return ret;
	346	break;
	347	default:
	348	av_log(h->avctx, AV_LOG_DEBUG, "unknown SEI type %d\n", type);
349	}
350	skip_bits_long(&h->gb, next - get_bits_count(&h->gb));
351
352	// FIXME check bits here
353	align_get_bits(&h->gb);
354	}
355
356	return 0;
357	}
358
359	const char* ff_h264_sei_stereo_mode(H264Context *h)
360	{
361	if (h->sei_fpa.frame_packing_arrangement_cancel_flag == 0) {
362	switch (h->sei_fpa.frame_packing_arrangement_type) {
363	case SEI_FPA_TYPE_CHECKERBOARD:
364	if (h->sei_fpa.content_interpretation_type == 2)
365	return "checkerboard_rl";
366	else
367	return "checkerboard_lr";
368	case SEI_FPA_TYPE_INTERLEAVE_COLUMN:
369	if (h->sei_fpa.content_interpretation_type == 2)
370	return "col_interleaved_rl";
371	else
372	return "col_interleaved_lr";
373	case SEI_FPA_TYPE_INTERLEAVE_ROW:
374	if (h->sei_fpa.content_interpretation_type == 2)
375	return "row_interleaved_rl";
376	else
377	return "row_interleaved_lr";
378	case SEI_FPA_TYPE_SIDE_BY_SIDE:
379	if (h->sei_fpa.content_interpretation_type == 2)
380	return "right_left";
381	else
382	return "left_right";
383	case SEI_FPA_TYPE_TOP_BOTTOM:
384	if (h->sei_fpa.content_interpretation_type == 2)
385	return "bottom_top";
386	else
387	return "top_bottom";
388	case SEI_FPA_TYPE_INTERLEAVE_TEMPORAL:
389	if (h->sei_fpa.content_interpretation_type == 2)
390	return "block_rl";
391	else
392	return "block_lr";
393	case SEI_FPA_TYPE_2D:
394	default:
395	return "mono";
396	}
397	} else if (h->sei_fpa.frame_packing_arrangement_cancel_flag == 1) {
398	return "mono";
399	} else {
400	return NULL;
401	}
402	}