| /* | |
| * 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; | |
| } | |
| } |