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https://github.com/FFmpeg/FFmpeg.git
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260 lines
8.8 KiB
C
260 lines
8.8 KiB
C
/*
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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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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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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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* Libav is distributed in the hope that it will be useful,
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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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* License along with Libav; if not, write to the Free Software
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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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* @file
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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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#include "h264.h"
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#include "internal.h"
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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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};
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void ff_h264_reset_sei(H264Context *h)
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{
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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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h->sei_frame_packing_present = 0;
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}
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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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}
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if (h->sps.pic_struct_present_flag) {
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unsigned int i, num_clock_ts;
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h->sei_pic_struct = get_bits(&h->gb, 4);
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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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return AVERROR_INVALIDDATA;
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num_clock_ts = sei_num_clock_ts_table[h->sei_pic_struct];
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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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unsigned int full_timestamp_flag;
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h->sei_ct_type |= 1 << get_bits(&h->gb, 2);
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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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if (full_timestamp_flag) {
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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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} else {
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if (get_bits(&h->gb, 1)) { /* seconds_flag */
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skip_bits(&h->gb, 6); /* seconds_value range 0..59 */
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if (get_bits(&h->gb, 1)) { /* minutes_flag */
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skip_bits(&h->gb, 6); /* minutes_value 0..59 */
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if (get_bits(&h->gb, 1)) /* hours_flag */
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skip_bits(&h->gb, 5); /* hours_value 0..23 */
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}
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}
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}
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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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}
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}
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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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}
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return 0;
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}
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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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int e, build, i;
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if (size < 16)
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return AVERROR_INVALIDDATA;
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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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user_data[i] = 0;
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e = sscanf(user_data + 16, "x264 - core %d", &build);
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if (e == 1 && build > 0)
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h->x264_build = build;
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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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for (; i < size; i++)
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skip_bits(&h->gb, 8);
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return 0;
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}
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static int decode_recovery_point(H264Context *h)
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{
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h->sei_recovery_frame_cnt = get_ue_golomb(&h->gb);
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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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return 0;
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}
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static int decode_buffering_period(H264Context *h)
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{
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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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sps_id = get_ue_golomb_31(&h->gb);
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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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return AVERROR_INVALIDDATA;
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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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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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}
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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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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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}
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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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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
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h->sei_frame_packing_present = !get_bits1(&h->gb);
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if (h->sei_frame_packing_present) {
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h->frame_packing_arrangement_type = get_bits(&h->gb, 7);
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h->quincunx_subsampling = get_bits1(&h->gb);
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h->content_interpretation_type = get_bits(&h->gb, 6);
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// the following skips: spatial_flipping_flag, frame0_flipped_flag,
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// field_views_flag, current_frame_is_frame0_flag,
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// frame0_self_contained_flag, frame1_self_contained_flag
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skip_bits(&h->gb, 6);
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if (!h->quincunx_subsampling && h->frame_packing_arrangement_type != 5)
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skip_bits(&h->gb, 16); // frame[01]_grid_position_[xy]
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skip_bits(&h->gb, 8); // frame_packing_arrangement_reserved_byte
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get_ue_golomb(&h->gb); // frame_packing_arrangement_repetition_period
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}
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skip_bits1(&h->gb); // frame_packing_arrangement_extension_flag
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return 0;
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}
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int ff_h264_decode_sei(H264Context *h)
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{
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while (get_bits_left(&h->gb) > 16) {
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int size = 0;
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int type = 0;
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int ret = 0;
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do
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type += show_bits(&h->gb, 8);
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while (get_bits(&h->gb, 8) == 255);
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do
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size += show_bits(&h->gb, 8);
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while (get_bits(&h->gb, 8) == 255);
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if (size > get_bits_left(&h->gb) / 8) {
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av_log(h->avctx, AV_LOG_ERROR, "SEI type %d truncated at %d\n",
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type, get_bits_left(&h->gb));
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return AVERROR_INVALIDDATA;
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}
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switch (type) {
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case SEI_TYPE_PIC_TIMING: // Picture timing SEI
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ret = decode_picture_timing(h);
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if (ret < 0)
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return ret;
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break;
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case SEI_TYPE_USER_DATA_UNREGISTERED:
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ret = decode_unregistered_user_data(h, size);
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if (ret < 0)
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return ret;
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break;
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case SEI_TYPE_RECOVERY_POINT:
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ret = decode_recovery_point(h);
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if (ret < 0)
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return ret;
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break;
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case SEI_TYPE_BUFFERING_PERIOD:
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ret = decode_buffering_period(h);
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if (ret < 0)
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return ret;
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break;
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case SEI_TYPE_FRAME_PACKING:
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ret = decode_frame_packing_arrangement(h);
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if (ret < 0)
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return ret;
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break;
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default:
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av_log(h->avctx, AV_LOG_DEBUG, "unknown SEI type %d\n", type);
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skip_bits(&h->gb, 8 * size);
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}
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// FIXME check bits here
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align_get_bits(&h->gb);
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}
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return 0;
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}
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