2010-01-12 18:54:40 +00:00
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/*
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* H.26L/H.264/AVC/JVT/14496-10/... sei decoding
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* Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
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*
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2011-03-18 17:35:10 +00:00
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* This file is part of Libav.
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2010-01-12 18:54:40 +00:00
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*
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2011-03-18 17:35:10 +00:00
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* Libav is free software; you can redistribute it and/or
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2010-01-12 18:54:40 +00:00
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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2011-03-18 17:35:10 +00:00
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* Libav is distributed in the hope that it will be useful,
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2010-01-12 18:54:40 +00:00
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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2011-03-18 17:35:10 +00:00
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* License along with Libav; if not, write to the Free Software
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2010-01-12 18:54:40 +00:00
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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2010-04-20 14:45:34 +00:00
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* @file
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2010-01-12 18:54:40 +00:00
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* H.264 / AVC / MPEG4 part10 sei decoding.
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* @author Michael Niedermayer <michaelni@gmx.at>
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*/
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#include "avcodec.h"
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#include "golomb.h"
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2014-02-13 09:01:03 +00:00
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#include "h264.h"
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#include "internal.h"
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2010-01-12 18:54:40 +00:00
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2013-07-31 08:13:22 +00:00
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static const uint8_t sei_num_clock_ts_table[9] = {
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1, 1, 1, 2, 2, 3, 3, 2, 3
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2010-01-12 18:54:40 +00:00
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};
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2013-07-31 08:13:22 +00:00
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void ff_h264_reset_sei(H264Context *h)
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{
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2010-01-12 18:54:40 +00:00
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h->sei_recovery_frame_cnt = -1;
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h->sei_dpb_output_delay = 0;
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h->sei_cpb_removal_delay = -1;
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h->sei_buffering_period_present = 0;
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2013-02-20 15:34:58 +00:00
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h->sei_frame_packing_present = 0;
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2014-07-02 15:58:19 +00:00
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h->sei_display_orientation_present = 0;
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2015-06-28 10:13:05 +00:00
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h->sei_reguserdata_afd_present = 0;
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2015-07-08 22:17:44 +00:00
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h->a53_caption_size = 0;
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av_freep(&h->a53_caption);
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2010-01-12 18:54:40 +00:00
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}
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2013-07-31 08:13:22 +00:00
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static int decode_picture_timing(H264Context *h)
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{
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if (h->sps.nal_hrd_parameters_present_flag ||
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h->sps.vcl_hrd_parameters_present_flag) {
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h->sei_cpb_removal_delay = get_bits(&h->gb,
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h->sps.cpb_removal_delay_length);
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h->sei_dpb_output_delay = get_bits(&h->gb,
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h->sps.dpb_output_delay_length);
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2010-01-12 18:54:40 +00:00
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}
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2013-07-31 08:13:22 +00:00
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if (h->sps.pic_struct_present_flag) {
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2010-01-12 18:54:40 +00:00
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unsigned int i, num_clock_ts;
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2013-07-31 08:13:22 +00:00
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2013-02-03 10:10:05 +00:00
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h->sei_pic_struct = get_bits(&h->gb, 4);
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2010-01-12 18:54:40 +00:00
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h->sei_ct_type = 0;
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if (h->sei_pic_struct > SEI_PIC_STRUCT_FRAME_TRIPLING)
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2013-08-02 08:33:00 +00:00
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return AVERROR_INVALIDDATA;
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2010-01-12 18:54:40 +00:00
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num_clock_ts = sei_num_clock_ts_table[h->sei_pic_struct];
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2013-07-31 08:13:22 +00:00
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for (i = 0; i < num_clock_ts; i++) {
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if (get_bits(&h->gb, 1)) { /* clock_timestamp_flag */
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2010-01-12 18:54:40 +00:00
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unsigned int full_timestamp_flag;
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2013-07-31 08:13:22 +00:00
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h->sei_ct_type |= 1 << get_bits(&h->gb, 2);
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2013-02-03 10:10:05 +00:00
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skip_bits(&h->gb, 1); /* nuit_field_based_flag */
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skip_bits(&h->gb, 5); /* counting_type */
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full_timestamp_flag = get_bits(&h->gb, 1);
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skip_bits(&h->gb, 1); /* discontinuity_flag */
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skip_bits(&h->gb, 1); /* cnt_dropped_flag */
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skip_bits(&h->gb, 8); /* n_frames */
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2013-07-31 08:13:22 +00:00
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if (full_timestamp_flag) {
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2013-02-03 10:10:05 +00:00
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skip_bits(&h->gb, 6); /* seconds_value 0..59 */
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skip_bits(&h->gb, 6); /* minutes_value 0..59 */
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skip_bits(&h->gb, 5); /* hours_value 0..23 */
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2013-07-31 08:13:22 +00:00
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} else {
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if (get_bits(&h->gb, 1)) { /* seconds_flag */
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2013-02-03 10:10:05 +00:00
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skip_bits(&h->gb, 6); /* seconds_value range 0..59 */
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2013-07-31 08:13:22 +00:00
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if (get_bits(&h->gb, 1)) { /* minutes_flag */
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2013-02-03 10:10:05 +00:00
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skip_bits(&h->gb, 6); /* minutes_value 0..59 */
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2013-07-31 08:13:22 +00:00
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if (get_bits(&h->gb, 1)) /* hours_flag */
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2013-02-03 10:10:05 +00:00
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skip_bits(&h->gb, 5); /* hours_value 0..23 */
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2010-01-12 18:54:40 +00:00
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}
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}
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}
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2013-07-31 08:13:22 +00:00
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if (h->sps.time_offset_length > 0)
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skip_bits(&h->gb,
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h->sps.time_offset_length); /* time_offset */
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2010-01-12 18:54:40 +00:00
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}
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}
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2013-07-31 08:13:22 +00:00
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if (h->avctx->debug & FF_DEBUG_PICT_INFO)
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av_log(h->avctx, AV_LOG_DEBUG, "ct_type:%X pic_struct:%d\n",
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h->sei_ct_type, h->sei_pic_struct);
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2010-01-12 18:54:40 +00:00
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}
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return 0;
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}
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2015-07-31 19:06:13 +00:00
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static int decode_registered_user_data_afd(H264Context *h, int size)
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{
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int flag;
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if (size-- < 1)
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return AVERROR_INVALIDDATA;
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skip_bits(&h->gb, 1); // 0
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flag = get_bits(&h->gb, 1); // active_format_flag
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skip_bits(&h->gb, 6); // reserved
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if (flag) {
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if (size-- < 1)
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return AVERROR_INVALIDDATA;
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skip_bits(&h->gb, 4); // reserved
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h->active_format_description = get_bits(&h->gb, 4);
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h->sei_reguserdata_afd_present = 1;
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}
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return 0;
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}
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static int decode_registered_user_data_closed_caption(H264Context *h, int size)
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{
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int flag;
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int user_data_type_code;
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int cc_count;
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if (size < 3)
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return AVERROR(EINVAL);
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user_data_type_code = get_bits(&h->gb, 8);
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if (user_data_type_code == 0x3) {
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skip_bits(&h->gb, 1); // reserved
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flag = get_bits(&h->gb, 1); // process_cc_data_flag
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if (flag) {
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skip_bits(&h->gb, 1); // zero bit
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cc_count = get_bits(&h->gb, 5);
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skip_bits(&h->gb, 8); // reserved
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size -= 2;
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if (cc_count && size >= cc_count * 3) {
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const uint64_t new_size = (h->a53_caption_size + cc_count
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* UINT64_C(3));
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int i, ret;
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if (new_size > INT_MAX)
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return AVERROR(EINVAL);
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/* Allow merging of the cc data from two fields. */
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ret = av_reallocp(&h->a53_caption, new_size);
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if (ret < 0)
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return ret;
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for (i = 0; i < cc_count; i++) {
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h->a53_caption[h->a53_caption_size++] = get_bits(&h->gb, 8);
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h->a53_caption[h->a53_caption_size++] = get_bits(&h->gb, 8);
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h->a53_caption[h->a53_caption_size++] = get_bits(&h->gb, 8);
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}
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skip_bits(&h->gb, 8); // marker_bits
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}
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}
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2015-08-07 19:30:38 +00:00
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} else {
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int i;
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2015-08-21 23:42:19 +00:00
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avpriv_request_sample(h->avctx, "Subtitles with data type 0x%02x",
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2015-08-07 19:30:38 +00:00
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user_data_type_code);
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for (i = 0; i < size - 1; i++)
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skip_bits(&h->gb, 8);
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2015-07-31 19:06:13 +00:00
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}
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return 0;
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}
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2015-06-28 10:13:05 +00:00
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static int decode_registered_user_data(H264Context *h, int size)
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{
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uint32_t country_code;
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uint32_t user_identifier;
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if (size < 7)
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return AVERROR_INVALIDDATA;
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size -= 7;
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country_code = get_bits(&h->gb, 8); // itu_t_t35_country_code
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if (country_code == 0xFF) {
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skip_bits(&h->gb, 8); // itu_t_t35_country_code_extension_byte
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size--;
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}
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/* itu_t_t35_payload_byte follows */
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skip_bits(&h->gb, 8); // terminal provider code
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skip_bits(&h->gb, 8); // terminal provider oriented code
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user_identifier = get_bits_long(&h->gb, 32);
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switch (user_identifier) {
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case MKBETAG('D', 'T', 'G', '1'): // afd_data
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2015-07-31 19:06:13 +00:00
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return decode_registered_user_data_afd(h, size);
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2015-07-08 22:17:44 +00:00
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case MKBETAG('G', 'A', '9', '4'): // closed captions
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2015-07-31 19:06:13 +00:00
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return decode_registered_user_data_closed_caption(h, size);
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2015-06-28 10:13:05 +00:00
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default:
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skip_bits(&h->gb, size * 8);
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break;
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}
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return 0;
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}
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2013-07-31 08:13:22 +00:00
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static int decode_unregistered_user_data(H264Context *h, int size)
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{
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uint8_t user_data[16 + 256];
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2010-01-12 18:54:40 +00:00
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int e, build, i;
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2013-07-31 08:13:22 +00:00
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if (size < 16)
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2013-08-02 08:33:00 +00:00
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return AVERROR_INVALIDDATA;
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2010-01-12 18:54:40 +00:00
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2013-07-31 08:13:22 +00:00
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for (i = 0; i < sizeof(user_data) - 1 && i < size; i++)
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user_data[i] = get_bits(&h->gb, 8);
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2010-01-12 18:54:40 +00:00
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2013-07-31 08:13:22 +00:00
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user_data[i] = 0;
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2013-07-31 16:07:53 +00:00
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e = sscanf(user_data + 16, "x264 - core %d", &build);
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2013-07-31 08:13:22 +00:00
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if (e == 1 && build > 0)
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h->x264_build = build;
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2010-01-12 18:54:40 +00:00
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2013-07-31 08:13:22 +00:00
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if (h->avctx->debug & FF_DEBUG_BUGS)
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av_log(h->avctx, AV_LOG_DEBUG, "user data:\"%s\"\n", user_data + 16);
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2010-01-12 18:54:40 +00:00
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2013-07-31 08:13:22 +00:00
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for (; i < size; i++)
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2013-02-03 10:10:05 +00:00
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skip_bits(&h->gb, 8);
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2010-01-12 18:54:40 +00:00
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return 0;
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}
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2013-07-31 08:13:22 +00:00
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static int decode_recovery_point(H264Context *h)
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{
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2013-02-03 10:10:05 +00:00
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h->sei_recovery_frame_cnt = get_ue_golomb(&h->gb);
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2013-07-31 08:13:22 +00:00
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/* 1b exact_match_flag,
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* 1b broken_link_flag,
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* 2b changing_slice_group_idc */
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skip_bits(&h->gb, 4);
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2010-01-12 18:54:40 +00:00
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return 0;
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}
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2013-07-31 08:13:22 +00:00
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static int decode_buffering_period(H264Context *h)
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{
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2010-01-12 18:54:40 +00:00
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unsigned int sps_id;
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int sched_sel_idx;
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SPS *sps;
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2013-02-03 10:10:05 +00:00
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sps_id = get_ue_golomb_31(&h->gb);
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2013-07-31 08:13:22 +00:00
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if (sps_id > 31 || !h->sps_buffers[sps_id]) {
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av_log(h->avctx, AV_LOG_ERROR,
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"non-existing SPS %d referenced in buffering period\n", sps_id);
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2013-08-02 08:33:00 +00:00
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return AVERROR_INVALIDDATA;
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2010-01-12 18:54:40 +00:00
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}
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sps = h->sps_buffers[sps_id];
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// NOTE: This is really so duplicated in the standard... See H.264, D.1.1
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if (sps->nal_hrd_parameters_present_flag) {
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for (sched_sel_idx = 0; sched_sel_idx < sps->cpb_cnt; sched_sel_idx++) {
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2013-07-31 08:13:22 +00:00
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h->initial_cpb_removal_delay[sched_sel_idx] =
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get_bits(&h->gb, sps->initial_cpb_removal_delay_length);
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// initial_cpb_removal_delay_offset
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skip_bits(&h->gb, sps->initial_cpb_removal_delay_length);
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2010-01-12 18:54:40 +00:00
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}
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}
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if (sps->vcl_hrd_parameters_present_flag) {
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for (sched_sel_idx = 0; sched_sel_idx < sps->cpb_cnt; sched_sel_idx++) {
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2013-07-31 08:13:22 +00:00
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h->initial_cpb_removal_delay[sched_sel_idx] =
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get_bits(&h->gb, sps->initial_cpb_removal_delay_length);
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// initial_cpb_removal_delay_offset
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skip_bits(&h->gb, sps->initial_cpb_removal_delay_length);
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2010-01-12 18:54:40 +00:00
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}
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}
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h->sei_buffering_period_present = 1;
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return 0;
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}
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2013-02-20 15:34:58 +00:00
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static int decode_frame_packing_arrangement(H264Context *h)
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{
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|
|
|
get_ue_golomb(&h->gb); // frame_packing_arrangement_id
|
2013-12-13 17:12:59 +00:00
|
|
|
h->sei_frame_packing_present = !get_bits1(&h->gb);
|
|
|
|
|
|
|
|
if (h->sei_frame_packing_present) {
|
|
|
|
h->frame_packing_arrangement_type = get_bits(&h->gb, 7);
|
|
|
|
h->quincunx_subsampling = get_bits1(&h->gb);
|
|
|
|
h->content_interpretation_type = get_bits(&h->gb, 6);
|
2013-02-20 15:34:58 +00:00
|
|
|
|
|
|
|
// 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);
|
|
|
|
|
2013-12-13 17:12:59 +00:00
|
|
|
if (!h->quincunx_subsampling && h->frame_packing_arrangement_type != 5)
|
2013-02-20 15:34:58 +00:00
|
|
|
skip_bits(&h->gb, 16); // frame[01]_grid_position_[xy]
|
|
|
|
skip_bits(&h->gb, 8); // frame_packing_arrangement_reserved_byte
|
|
|
|
get_ue_golomb(&h->gb); // frame_packing_arrangement_repetition_period
|
|
|
|
}
|
|
|
|
skip_bits1(&h->gb); // frame_packing_arrangement_extension_flag
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2014-07-02 15:58:19 +00:00
|
|
|
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;
|
|
|
|
}
|
|
|
|
|
2013-07-31 08:13:22 +00:00
|
|
|
int ff_h264_decode_sei(H264Context *h)
|
|
|
|
{
|
2013-02-03 10:10:05 +00:00
|
|
|
while (get_bits_left(&h->gb) > 16) {
|
2013-07-31 08:13:22 +00:00
|
|
|
int size = 0;
|
|
|
|
int type = 0;
|
2013-08-02 08:33:00 +00:00
|
|
|
int ret = 0;
|
2014-07-30 18:33:36 +00:00
|
|
|
int last = 0;
|
2010-01-12 18:54:40 +00:00
|
|
|
|
2014-07-30 18:33:36 +00:00
|
|
|
while (get_bits_left(&h->gb) >= 8 &&
|
|
|
|
(last = get_bits(&h->gb, 8)) == 255) {
|
|
|
|
type += 255;
|
|
|
|
}
|
|
|
|
type += last;
|
2010-01-12 18:54:40 +00:00
|
|
|
|
2014-07-30 18:33:36 +00:00
|
|
|
last = 0;
|
|
|
|
while (get_bits_left(&h->gb) >= 8 &&
|
|
|
|
(last = get_bits(&h->gb, 8)) == 255) {
|
|
|
|
size += 255;
|
|
|
|
}
|
|
|
|
size += last;
|
2010-01-12 18:54:40 +00:00
|
|
|
|
2013-09-19 14:26:25 +00:00
|
|
|
if (size > get_bits_left(&h->gb) / 8) {
|
|
|
|
av_log(h->avctx, AV_LOG_ERROR, "SEI type %d truncated at %d\n",
|
|
|
|
type, get_bits_left(&h->gb));
|
|
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
}
|
|
|
|
|
2013-07-31 08:13:22 +00:00
|
|
|
switch (type) {
|
2010-01-12 18:54:40 +00:00
|
|
|
case SEI_TYPE_PIC_TIMING: // Picture timing SEI
|
2013-08-02 08:33:00 +00:00
|
|
|
ret = decode_picture_timing(h);
|
2010-01-12 18:54:40 +00:00
|
|
|
break;
|
2015-06-28 10:13:05 +00:00
|
|
|
case SEI_TYPE_USER_DATA_REGISTERED:
|
|
|
|
ret = decode_registered_user_data(h, size);
|
|
|
|
break;
|
2010-01-12 18:54:40 +00:00
|
|
|
case SEI_TYPE_USER_DATA_UNREGISTERED:
|
2013-08-02 08:33:00 +00:00
|
|
|
ret = decode_unregistered_user_data(h, size);
|
2010-01-12 18:54:40 +00:00
|
|
|
break;
|
|
|
|
case SEI_TYPE_RECOVERY_POINT:
|
2013-08-02 08:33:00 +00:00
|
|
|
ret = decode_recovery_point(h);
|
2010-01-12 18:54:40 +00:00
|
|
|
break;
|
2014-02-13 01:26:04 +00:00
|
|
|
case SEI_TYPE_BUFFERING_PERIOD:
|
2013-08-02 08:33:00 +00:00
|
|
|
ret = decode_buffering_period(h);
|
2010-01-12 18:54:40 +00:00
|
|
|
break;
|
2013-02-20 15:34:58 +00:00
|
|
|
case SEI_TYPE_FRAME_PACKING:
|
|
|
|
ret = decode_frame_packing_arrangement(h);
|
|
|
|
break;
|
2014-07-02 15:58:19 +00:00
|
|
|
case SEI_TYPE_DISPLAY_ORIENTATION:
|
|
|
|
ret = decode_display_orientation(h);
|
|
|
|
break;
|
2010-01-12 18:54:40 +00:00
|
|
|
default:
|
2013-09-19 15:28:41 +00:00
|
|
|
av_log(h->avctx, AV_LOG_DEBUG, "unknown SEI type %d\n", type);
|
2013-07-31 08:13:22 +00:00
|
|
|
skip_bits(&h->gb, 8 * size);
|
2010-01-12 18:54:40 +00:00
|
|
|
}
|
2015-06-28 00:05:04 +00:00
|
|
|
if (ret < 0)
|
|
|
|
return ret;
|
2010-01-12 18:54:40 +00:00
|
|
|
|
2013-07-31 08:13:22 +00:00
|
|
|
// FIXME check bits here
|
2013-02-03 10:10:05 +00:00
|
|
|
align_get_bits(&h->gb);
|
2010-01-12 18:54:40 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|