/* * 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 "avcodec.h" #include "get_bits.h" #include "golomb.h" #include "h264_ps.h" #include "h264_sei.h" #include "internal.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->frame_packing.present = 0; h->display_orientation.present = 0; h->afd.present = 0; h->a53_caption.a53_caption_size = 0; av_freep(&h->a53_caption.a53_caption); } static int decode_picture_timing(H264SEIPictureTiming *h, GetBitContext *gb, const H264ParamSets *ps, void *logctx) { int i; const SPS *sps = ps->sps; for (i = 0; i<MAX_SPS_COUNT; i++) if ((!sps || !sps->log2_max_frame_num) && ps->sps_list[i]) sps = (const SPS *)ps->sps_list[i]->data; if (!sps) { av_log(logctx, AV_LOG_ERROR, "SPS unavailable in decode_picture_timing\n"); return AVERROR_PS_NOT_FOUND; } 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]; for (i = 0; i < num_clock_ts; i++) { if (get_bits(gb, 1)) { /* clock_timestamp_flag */ unsigned int full_timestamp_flag; h->ct_type |= 1 << get_bits(gb, 2); skip_bits(gb, 1); /* nuit_field_based_flag */ skip_bits(gb, 5); /* counting_type */ full_timestamp_flag = get_bits(gb, 1); skip_bits(gb, 1); /* discontinuity_flag */ skip_bits(gb, 1); /* cnt_dropped_flag */ skip_bits(gb, 8); /* n_frames */ if (full_timestamp_flag) { skip_bits(gb, 6); /* seconds_value 0..59 */ skip_bits(gb, 6); /* minutes_value 0..59 */ skip_bits(gb, 5); /* hours_value 0..23 */ } else { if (get_bits(gb, 1)) { /* seconds_flag */ skip_bits(gb, 6); /* seconds_value range 0..59 */ if (get_bits(gb, 1)) { /* minutes_flag */ skip_bits(gb, 6); /* minutes_value 0..59 */ if (get_bits(gb, 1)) /* hours_flag */ skip_bits(gb, 5); /* hours_value 0..23 */ } } } 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); } h->present = 1; return 0; } static int decode_registered_user_data_afd(H264SEIAFD *h, GetBitContext *gb, int size) { int flag; if (size-- < 1) return AVERROR_INVALIDDATA; skip_bits(gb, 1); // 0 flag = get_bits(gb, 1); // active_format_flag skip_bits(gb, 6); // reserved if (flag) { if (size-- < 1) return AVERROR_INVALIDDATA; skip_bits(gb, 4); // reserved h->active_format_description = get_bits(gb, 4); h->present = 1; } return 0; } static int decode_registered_user_data_closed_caption(H264SEIA53Caption *h, GetBitContext *gb, void *logctx, int size) { int flag; int user_data_type_code; int cc_count; if (size < 3) return AVERROR(EINVAL); user_data_type_code = get_bits(gb, 8); if (user_data_type_code == 0x3) { skip_bits(gb, 1); // reserved flag = get_bits(gb, 1); // process_cc_data_flag if (flag) { skip_bits(gb, 1); // zero bit cc_count = get_bits(gb, 5); skip_bits(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(gb, 8); h->a53_caption[h->a53_caption_size++] = get_bits(gb, 8); h->a53_caption[h->a53_caption_size++] = get_bits(gb, 8); } skip_bits(gb, 8); // marker_bits } } } else { int i; for (i = 0; i < size - 1; i++) skip_bits(gb, 8); } return 0; } static int decode_registered_user_data(H264SEIContext *h, GetBitContext *gb, void *logctx, int size) { uint32_t country_code; uint32_t user_identifier; if (size < 7) return AVERROR_INVALIDDATA; size -= 7; country_code = get_bits(gb, 8); // itu_t_t35_country_code if (country_code == 0xFF) { skip_bits(gb, 8); // itu_t_t35_country_code_extension_byte size--; } /* itu_t_t35_payload_byte follows */ skip_bits(gb, 8); // terminal provider code skip_bits(gb, 8); // terminal provider oriented code user_identifier = get_bits_long(gb, 32); switch (user_identifier) { case MKBETAG('D', 'T', 'G', '1'): // afd_data return decode_registered_user_data_afd(&h->afd, gb, size); case MKBETAG('G', 'A', '9', '4'): // closed captions return decode_registered_user_data_closed_caption(&h->a53_caption, gb, logctx, size); default: skip_bits(gb, size * 8); break; } return 0; } static int decode_unregistered_user_data(H264SEIUnregistered *h, GetBitContext *gb, void *logctx, int size) { uint8_t *user_data; int e, build, i; if (size < 16 || size >= INT_MAX - 16) return AVERROR_INVALIDDATA; user_data = av_malloc(16 + size + 1); if (!user_data) return AVERROR(ENOMEM); for (i = 0; i < size + 16; i++) user_data[i] = get_bits(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; av_free(user_data); return 0; } static int decode_recovery_point(H264SEIRecoveryPoint *h, GetBitContext *gb) { h->recovery_frame_cnt = get_ue_golomb_long(gb); /* 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 = (const SPS*)ps->sps_list[sps_id]->data; // 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_frame_packing_arrangement(H264SEIFramePacking *h, GetBitContext *gb) { h->arrangement_id = get_ue_golomb_long(gb); h->arrangement_cancel_flag = get_bits1(gb); h->present = !h->arrangement_cancel_flag; if (h->present) { h->arrangement_type = get_bits(gb, 7); h->quincunx_sampling_flag = get_bits1(gb); h->content_interpretation_type = get_bits(gb, 6); // spatial_flipping_flag, frame0_flipped_flag, field_views_flag skip_bits(gb, 3); h->current_frame_is_frame0_flag = get_bits1(gb); // frame0_self_contained_flag, frame1_self_contained_flag skip_bits(gb, 2); if (!h->quincunx_sampling_flag && h->arrangement_type != 5) skip_bits(gb, 16); // frame[01]_grid_position_[xy] skip_bits(gb, 8); // frame_packing_arrangement_reserved_byte h->arrangement_repetition_period = get_ue_golomb_long(gb); } skip_bits1(gb); // frame_packing_arrangement_extension_flag return 0; } static int decode_display_orientation(H264SEIDisplayOrientation *h, GetBitContext *gb) { h->present = !get_bits1(gb); if (h->present) { h->hflip = get_bits1(gb); // hor_flip h->vflip = get_bits1(gb); // ver_flip h->anticlockwise_rotation = get_bits(gb, 16); get_ue_golomb_long(gb); // display_orientation_repetition_period skip_bits1(gb); // display_orientation_extension_flag } return 0; } static int decode_green_metadata(H264SEIGreenMetaData *h, GetBitContext *gb) { h->green_metadata_type = get_bits(gb, 8); if (h->green_metadata_type == 0) { h->period_type = get_bits(gb, 8); if (h->period_type == 2) h->num_seconds = get_bits(gb, 16); else if (h->period_type == 3) h->num_pictures = get_bits(gb, 16); h->percent_non_zero_macroblocks = get_bits(gb, 8); h->percent_intra_coded_macroblocks = get_bits(gb, 8); h->percent_six_tap_filtering = get_bits(gb, 8); h->percent_alpha_point_deblocking_instance = get_bits(gb, 8); } else if (h->green_metadata_type == 1) { h->xsd_metric_type = get_bits(gb, 8); h->xsd_metric_value = get_bits(gb, 16); } return 0; } static int decode_alternative_transfer(H264SEIAlternativeTransfer *h, GetBitContext *gb) { h->present = 1; h->preferred_transfer_characteristics = get_bits(gb, 8); return 0; } int ff_h264_sei_decode(H264SEIContext *h, GetBitContext *gb, const H264ParamSets *ps, void *logctx) { int master_ret = 0; while (get_bits_left(gb) > 16 && show_bits(gb, 16)) { int type = 0; unsigned size = 0; unsigned next; int ret = 0; do { if (get_bits_left(gb) < 8) return AVERROR_INVALIDDATA; type += show_bits(gb, 8); } while (get_bits(gb, 8) == 255); do { if (get_bits_left(gb) < 8) return AVERROR_INVALIDDATA; size += show_bits(gb, 8); } while (get_bits(gb, 8) == 255); if (size > get_bits_left(gb) / 8) { av_log(logctx, AV_LOG_ERROR, "SEI type %d size %d truncated at %d\n", type, 8*size, get_bits_left(gb)); return AVERROR_INVALIDDATA; } next = get_bits_count(gb) + 8 * size; switch (type) { case H264_SEI_TYPE_PIC_TIMING: // Picture timing SEI ret = decode_picture_timing(&h->picture_timing, gb, ps, logctx); break; case H264_SEI_TYPE_USER_DATA_REGISTERED: ret = decode_registered_user_data(h, gb, logctx, size); break; case H264_SEI_TYPE_USER_DATA_UNREGISTERED: ret = decode_unregistered_user_data(&h->unregistered, gb, logctx, size); break; case H264_SEI_TYPE_RECOVERY_POINT: ret = decode_recovery_point(&h->recovery_point, gb); break; case H264_SEI_TYPE_BUFFERING_PERIOD: ret = decode_buffering_period(&h->buffering_period, gb, ps, logctx); break; case H264_SEI_TYPE_FRAME_PACKING: ret = decode_frame_packing_arrangement(&h->frame_packing, gb); break; case H264_SEI_TYPE_DISPLAY_ORIENTATION: ret = decode_display_orientation(&h->display_orientation, gb); break; case H264_SEI_TYPE_GREEN_METADATA: ret = decode_green_metadata(&h->green_metadata, gb); break; case H264_SEI_TYPE_ALTERNATIVE_TRANSFER: ret = decode_alternative_transfer(&h->alternative_transfer, gb); break; default: 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; skip_bits_long(gb, next - get_bits_count(gb)); // FIXME check bits here align_get_bits(gb); } return master_ret; } const char *ff_h264_sei_stereo_mode(const H264SEIFramePacking *h) { if (h->arrangement_cancel_flag == 0) { switch (h->arrangement_type) { case H264_SEI_FPA_TYPE_CHECKERBOARD: if (h->content_interpretation_type == 2) return "checkerboard_rl"; else return "checkerboard_lr"; case H264_SEI_FPA_TYPE_INTERLEAVE_COLUMN: if (h->content_interpretation_type == 2) return "col_interleaved_rl"; else return "col_interleaved_lr"; case H264_SEI_FPA_TYPE_INTERLEAVE_ROW: if (h->content_interpretation_type == 2) return "row_interleaved_rl"; else return "row_interleaved_lr"; case H264_SEI_FPA_TYPE_SIDE_BY_SIDE: if (h->content_interpretation_type == 2) return "right_left"; else return "left_right"; case H264_SEI_FPA_TYPE_TOP_BOTTOM: if (h->content_interpretation_type == 2) return "bottom_top"; else return "top_bottom"; case H264_SEI_FPA_TYPE_INTERLEAVE_TEMPORAL: if (h->content_interpretation_type == 2) return "block_rl"; else return "block_lr"; case H264_SEI_FPA_TYPE_2D: default: return "mono"; } } else if (h->arrangement_cancel_flag == 1) { return "mono"; } else { return NULL; } }