| /* |
| * 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 / MPEG4 part10 sei decoding. |
| * @author Michael Niedermayer <michaelni@gmx.at> |
| */ |
| |
| #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; |
| } |
| |
| static int decode_picture_timing(H264Context *h) |
| { |
| SPS *sps = &h->sps; |
| int i; |
| |
| for (i = 0; i<MAX_SPS_COUNT; 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_user_data_itu_t_t35(H264Context *h, int size) |
| { |
| uint32_t user_identifier; |
| int dtg_active_format; |
| |
| if (size < 7) |
| return -1; |
| size -= 7; |
| |
| skip_bits(&h->gb, 8); // country_code |
| skip_bits(&h->gb, 16); // provider_code |
| user_identifier = get_bits_long(&h->gb, 32); |
| |
| switch (user_identifier) { |
| case 0x44544731: // "DTG1" - AFD_data |
| if (size < 1) |
| return -1; |
| skip_bits(&h->gb, 1); |
| if (get_bits(&h->gb, 1)) { |
| skip_bits(&h->gb, 6); |
| if (size < 2) |
| return -1; |
| skip_bits(&h->gb, 4); |
| dtg_active_format = get_bits(&h->gb, 4); |
| h->avctx->dtg_active_format = dtg_active_format; |
| } else { |
| skip_bits(&h->gb, 6); |
| } |
| break; |
| 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; |
| } |
| |
| 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); |
| if (ret < 0) |
| return ret; |
| break; |
| case SEI_TYPE_USER_DATA_ITU_T_T35: |
| if (decode_user_data_itu_t_t35(h, size) < 0) |
| return -1; |
| break; |
| case SEI_TYPE_USER_DATA_UNREGISTERED: |
| ret = decode_unregistered_user_data(h, size); |
| if (ret < 0) |
| return ret; |
| break; |
| case SEI_TYPE_RECOVERY_POINT: |
| ret = decode_recovery_point(h); |
| if (ret < 0) |
| return ret; |
| break; |
| case SEI_TYPE_BUFFERING_PERIOD: |
| ret = decode_buffering_period(h); |
| if (ret < 0) |
| return ret; |
| break; |
| case SEI_TYPE_FRAME_PACKING: |
| ret = decode_frame_packing_arrangement(h); |
| if (ret < 0) |
| return ret; |
| break; |
| case SEI_TYPE_DISPLAY_ORIENTATION: |
| ret = decode_display_orientation(h); |
| if (ret < 0) |
| return ret; |
| break; |
| default: |
| av_log(h->avctx, AV_LOG_DEBUG, "unknown SEI type %d\n", type); |
| } |
| 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; |
| } |
| } |
