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/*

 * H.26L/H.264/AVC/JVT/14496-10/... sei decoding

 * Copyright (c) 2003 Michael Niedermayer 

 *

 * 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 

 */

#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;

    h->sei_reguserdata_afd_present  =  0;

    h->a53_caption_size = 0;

    av_freep(&h->a53_caption);

}

static int decode_picture_timing(H264Context *h)

{

    SPS *sps = &h->sps;

    int i;

    for (i = 0; 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_registered_user_data_afd(H264Context *h, int size)

{

    int flag;

    if (size-- < 1)

        return AVERROR_INVALIDDATA;

    skip_bits(&h->gb, 1);               // 0

    flag = get_bits(&h->gb, 1);         // active_format_flag

    skip_bits(&h->gb, 6);               // reserved

    if (flag) {

        if (size-- < 1)

            return AVERROR_INVALIDDATA;

        skip_bits(&h->gb, 4);           // reserved

        h->active_format_description   = get_bits(&h->gb, 4);

        h->sei_reguserdata_afd_present = 1;

#if FF_API_AFD

FF_DISABLE_DEPRECATION_WARNINGS

        h->avctx->dtg_active_format = h->active_format_description;

FF_ENABLE_DEPRECATION_WARNINGS

#endif /* FF_API_AFD */

    }

    return 0;

}

static int decode_registered_user_data_closed_caption(H264Context *h, int size)

{

    int flag;

    int user_data_type_code;

    int cc_count;

    if (size < 3)

        return AVERROR(EINVAL);

    user_data_type_code = get_bits(&h->gb, 8);

    if (user_data_type_code == 0x3) {

        skip_bits(&h->gb, 1);           // reserved

        flag = get_bits(&h->gb, 1);     // process_cc_data_flag

        if (flag) {

            skip_bits(&h->gb, 1);       // zero bit

            cc_count = get_bits(&h->gb, 5);

            skip_bits(&h->gb, 8);       // reserved

            size -= 2;

            if (cc_count && size >= cc_count * 3) {

                const uint64_t new_size = (h->a53_caption_size + cc_count

                                           * UINT64_C(3));

                int i, ret;

                if (new_size > INT_MAX)

                    return AVERROR(EINVAL);

                /* Allow merging of the cc data from two fields. */

                ret = av_reallocp(&h->a53_caption, new_size);

                if (ret < 0)

                    return ret;

                for (i = 0; i < cc_count; i++) {

                    h->a53_caption[h->a53_caption_size++] = get_bits(&h->gb, 8);

                    h->a53_caption[h->a53_caption_size++] = get_bits(&h->gb, 8);

                    h->a53_caption[h->a53_caption_size++] = get_bits(&h->gb, 8);

                }

                skip_bits(&h->gb, 8);   // marker_bits

            }

        }

    } else {

        int i;

        for (i = 0; i < size - 1; i++)

            skip_bits(&h->gb, 8);

    }

    return 0;

}

static int decode_registered_user_data(H264Context *h, int size)

{

    uint32_t country_code;

    uint32_t user_identifier;

    if (size < 7)

        return AVERROR_INVALIDDATA;

    size -= 7;

    country_code = get_bits(&h->gb, 8); // itu_t_t35_country_code

    if (country_code == 0xFF) {

        skip_bits(&h->gb, 8);           // itu_t_t35_country_code_extension_byte

        size--;

    }

    /* itu_t_t35_payload_byte follows */

    skip_bits(&h->gb, 8);              // terminal provider code

    skip_bits(&h->gb, 8);              // terminal provider oriented code

    user_identifier = get_bits_long(&h->gb, 32);

    switch (user_identifier) {

        case MKBETAG('D', 'T', 'G', '1'):       // afd_data

            return decode_registered_user_data_afd(h, size);

        case MKBETAG('G', 'A', '9', '4'):       // closed captions

            return decode_registered_user_data_closed_caption(h, size);

        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;

}

static int decode_GreenMetadata(H264Context *h)

{

    if (h->avctx->debug & FF_DEBUG_GREEN_MD)

        av_log(h->avctx, AV_LOG_DEBUG,          "Green Metadata Info SEI message\n");

    h->sei_green_metadata.green_metadata_type=get_bits(&h->gb, 8);

    if (h->avctx->debug & FF_DEBUG_GREEN_MD)

        av_log(h->avctx, AV_LOG_DEBUG,          "green_metadata_type                            = %d\n",

               h->sei_green_metadata.green_metadata_type);

    if (h->sei_green_metadata.green_metadata_type==0){

        h->sei_green_metadata.period_type=get_bits(&h->gb, 8);

        if (h->avctx->debug & FF_DEBUG_GREEN_MD)

            av_log(h->avctx, AV_LOG_DEBUG,      "green_metadata_period_type                     = %d\n",

                   h->sei_green_metadata.period_type);

        if (h->sei_green_metadata.green_metadata_type==2){

            h->sei_green_metadata.num_seconds = get_bits(&h->gb, 16);

            if (h->avctx->debug & FF_DEBUG_GREEN_MD)

                av_log(h->avctx, AV_LOG_DEBUG,  "green_metadata_num_seconds                     = %d\n",

                       h->sei_green_metadata.num_seconds);

        }

        else if (h->sei_green_metadata.period_type==3){

            h->sei_green_metadata.num_pictures = get_bits(&h->gb, 16);

            if (h->avctx->debug & FF_DEBUG_GREEN_MD)

                av_log(h->avctx, AV_LOG_DEBUG,  "green_metadata_num_pictures                    = %d\n",

                       h->sei_green_metadata.num_pictures);

        }

        h->sei_green_metadata.percent_non_zero_macroblocks=get_bits(&h->gb, 8);

        h->sei_green_metadata.percent_intra_coded_macroblocks=get_bits(&h->gb, 8);

        h->sei_green_metadata.percent_six_tap_filtering=get_bits(&h->gb, 8);

        h->sei_green_metadata.percent_alpha_point_deblocking_instance=get_bits(&h->gb, 8);

        if (h->avctx->debug & FF_DEBUG_GREEN_MD)

            av_log(h->avctx, AV_LOG_DEBUG,      "SEI GREEN Complexity Metrics                   = %f %f %f %f\n",

                                           (float)h->sei_green_metadata.percent_non_zero_macroblocks/255,

                                           (float)h->sei_green_metadata.percent_intra_coded_macroblocks/255,

                                           (float)h->sei_green_metadata.percent_six_tap_filtering/255,

                                           (float)h->sei_green_metadata.percent_alpha_point_deblocking_instance/255);

    }else if( h->sei_green_metadata.green_metadata_type==1){

        h->sei_green_metadata.xsd_metric_type=get_bits(&h->gb, 8);

        h->sei_green_metadata.xsd_metric_value=get_bits(&h->gb, 16);

        if (h->avctx->debug & FF_DEBUG_GREEN_MD)

            av_log(h->avctx, AV_LOG_DEBUG,      "xsd_metric_type                                = %d\n",

                   h->sei_green_metadata.xsd_metric_type);

        if ( h->sei_green_metadata.xsd_metric_type==0){

            if (h->avctx->debug & FF_DEBUG_GREEN_MD)

                av_log(h->avctx, AV_LOG_DEBUG,  "xsd_metric_value                               = %f\n",

                       (float)h->sei_green_metadata.xsd_metric_value/100);

        }

    }

    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);

            break;

        case SEI_TYPE_USER_DATA_REGISTERED:

            ret = decode_registered_user_data(h, size);

            break;

        case SEI_TYPE_USER_DATA_UNREGISTERED:

            ret = decode_unregistered_user_data(h, size);

            break;

        case SEI_TYPE_RECOVERY_POINT:

            ret = decode_recovery_point(h);

            break;

        case SEI_TYPE_BUFFERING_PERIOD:

            ret = decode_buffering_period(h);

            break;

        case SEI_TYPE_FRAME_PACKING:

            ret = decode_frame_packing_arrangement(h);

            break;

        case SEI_TYPE_DISPLAY_ORIENTATION:

            ret = decode_display_orientation(h);

            break;

        case SEI_TYPE_GREEN_METADATA:

            ret = decode_GreenMetadata(h);

            break;

        default:

            av_log(h->avctx, AV_LOG_DEBUG, "unknown SEI type %d\n", type);

        }

        if (ret < 0)

            return ret;

        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;

    }

}