| /* Gstreamer |
| * Copyright (C) <2011> Intel Corporation |
| * Copyright (C) <2011> Collabora Ltd. |
| * Copyright (C) <2011> Thibault Saunier <thibault.saunier@collabora.com> |
| * |
| * Some bits C-c,C-v'ed and s/4/3 from h264parse and videoparsers/h264parse.c: |
| * Copyright (C) <2010> Mark Nauwelaerts <mark.nauwelaerts@collabora.co.uk> |
| * Copyright (C) <2010> Collabora Multimedia |
| * Copyright (C) <2010> Nokia Corporation |
| * |
| * (C) 2005 Michal Benes <michal.benes@itonis.tv> |
| * (C) 2008 Wim Taymans <wim.taymans@gmail.com> |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Library General Public |
| * License as published by the Free Software Foundation; either |
| * version 2 of the License, or (at your option) any later version. |
| * |
| * This library 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 |
| * Library General Public License for more details. |
| * |
| * You should have received a copy of the GNU Library General Public |
| * License along with this library; if not, write to the |
| * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, |
| * Boston, MA 02110-1301, USA. |
| */ |
| |
| /** |
| * SECTION:gsth264parser |
| * @short_description: Convenience library for h264 video |
| * bitstream parsing. |
| * |
| * It offers you bitstream parsing in AVC mode or not. To identify Nals in a bitstream and |
| * parse its headers, you should call: |
| * <itemizedlist> |
| * <listitem> |
| * #gst_h264_parser_identify_nalu to identify the following nalu in not AVC bitstreams |
| * </listitem> |
| * <listitem> |
| * #gst_h264_parser_identify_nalu_avc to identify the nalu in AVC bitstreams |
| * </listitem> |
| * </itemizedlist> |
| * |
| * Then, depending on the #GstH264NalUnitType of the newly parsed #GstH264NalUnit, you should |
| * call the differents functions to parse the structure: |
| * <itemizedlist> |
| * <listitem> |
| * From #GST_H264_NAL_SLICE to #GST_H264_NAL_SLICE_IDR: #gst_h264_parser_parse_slice_hdr |
| * </listitem> |
| * <listitem> |
| * #GST_H264_NAL_SEI: #gst_h264_parser_parse_sei |
| * </listitem> |
| * <listitem> |
| * #GST_H264_NAL_SPS: #gst_h264_parser_parse_sps |
| * </listitem> |
| * <listitem> |
| * #GST_H264_NAL_PPS: #gst_h264_parser_parse_pps |
| * </listitem> |
| * <listitem> |
| * Any other: #gst_h264_parser_parse_nal |
| * </listitem> |
| * </itemizedlist> |
| * |
| * Note: You should always call gst_h264_parser_parse_nal if you don't actually need |
| * #GstH264NalUnitType to be parsed for your personnal use, in order to guarantee that the |
| * #GstH264NalParser is always up to date. |
| * |
| * For more details about the structures, look at the ITU-T H.264 and ISO/IEC 14496-10 – MPEG-4 |
| * Part 10 specifications, you can download them from: |
| * |
| * <itemizedlist> |
| * <listitem> |
| * ITU-T H.264: http://www.itu.int/rec/T-REC-H.264 |
| * </listitem> |
| * <listitem> |
| * ISO/IEC 14496-10: http://www.iso.org/iso/iso_catalogue/catalogue_tc/catalogue_detail.htm?csnumber=56538 |
| * </listitem> |
| * </itemizedlist> |
| */ |
| |
| #ifdef HAVE_CONFIG_H |
| # include "config.h" |
| #endif |
| |
| #include "nalutils.h" |
| #include "gsth264parser.h" |
| |
| #include <gst/base/gstbytereader.h> |
| #include <gst/base/gstbitreader.h> |
| #include <string.h> |
| |
| GST_DEBUG_CATEGORY (h264_parser_debug); |
| #define GST_CAT_DEFAULT h264_parser_debug |
| |
| static gboolean initialized = FALSE; |
| #define INITIALIZE_DEBUG_CATEGORY \ |
| if (!initialized) { \ |
| GST_DEBUG_CATEGORY_INIT (h264_parser_debug, "codecparsers_h264", 0, \ |
| "h264 parser library"); \ |
| initialized = TRUE; \ |
| } |
| |
| /**** Default scaling_lists according to Table 7-2 *****/ |
| static const guint8 default_4x4_intra[16] = { |
| 6, 13, 13, 20, 20, 20, 28, 28, 28, 28, 32, 32, |
| 32, 37, 37, 42 |
| }; |
| |
| static const guint8 default_4x4_inter[16] = { |
| 10, 14, 14, 20, 20, 20, 24, 24, 24, 24, 27, 27, |
| 27, 30, 30, 34 |
| }; |
| |
| static const guint8 default_8x8_intra[64] = { |
| 6, 10, 10, 13, 11, 13, 16, 16, 16, 16, 18, 18, |
| 18, 18, 18, 23, 23, 23, 23, 23, 23, 25, 25, 25, 25, 25, 25, 25, 27, 27, 27, |
| 27, 27, 27, 27, 27, 29, 29, 29, 29, 29, 29, 29, 31, 31, 31, 31, 31, 31, 33, |
| 33, 33, 33, 33, 36, 36, 36, 36, 38, 38, 38, 40, 40, 42 |
| }; |
| |
| static const guint8 default_8x8_inter[64] = { |
| 9, 13, 13, 15, 13, 15, 17, 17, 17, 17, 19, 19, |
| 19, 19, 19, 21, 21, 21, 21, 21, 21, 22, 22, 22, 22, 22, 22, 22, 24, 24, 24, |
| 24, 24, 24, 24, 24, 25, 25, 25, 25, 25, 25, 25, 27, 27, 27, 27, 27, 27, 28, |
| 28, 28, 28, 28, 30, 30, 30, 30, 32, 32, 32, 33, 33, 35 |
| }; |
| |
| static const guint8 zigzag_8x8[64] = { |
| 0, 1, 8, 16, 9, 2, 3, 10, |
| 17, 24, 32, 25, 18, 11, 4, 5, |
| 12, 19, 26, 33, 40, 48, 41, 34, |
| 27, 20, 13, 6, 7, 14, 21, 28, |
| 35, 42, 49, 56, 57, 50, 43, 36, |
| 29, 22, 15, 23, 30, 37, 44, 51, |
| 58, 59, 52, 45, 38, 31, 39, 46, |
| 53, 60, 61, 54, 47, 55, 62, 63 |
| }; |
| |
| static const guint8 zigzag_4x4[16] = { |
| 0, 1, 4, 8, |
| 5, 2, 3, 6, |
| 9, 12, 13, 10, |
| 7, 11, 14, 15, |
| }; |
| |
| typedef struct |
| { |
| guint par_n, par_d; |
| } PAR; |
| |
| /* Table E-1 - Meaning of sample aspect ratio indicator (1..16) */ |
| static PAR aspect_ratios[17] = { |
| {0, 0}, |
| {1, 1}, |
| {12, 11}, |
| {10, 11}, |
| {16, 11}, |
| {40, 33}, |
| {24, 11}, |
| {20, 11}, |
| {32, 11}, |
| {80, 33}, |
| {18, 11}, |
| {15, 11}, |
| {64, 33}, |
| {160, 99}, |
| {4, 3}, |
| {3, 2}, |
| {2, 1} |
| }; |
| |
| /***** Utils ****/ |
| #define EXTENDED_SAR 255 |
| |
| static GstH264SPS * |
| gst_h264_parser_get_sps (GstH264NalParser * nalparser, guint8 sps_id) |
| { |
| GstH264SPS *sps; |
| |
| sps = &nalparser->sps[sps_id]; |
| |
| if (sps->valid) |
| return sps; |
| |
| return NULL; |
| } |
| |
| static GstH264PPS * |
| gst_h264_parser_get_pps (GstH264NalParser * nalparser, guint8 pps_id) |
| { |
| GstH264PPS *pps; |
| |
| pps = &nalparser->pps[pps_id]; |
| |
| if (pps->valid) |
| return pps; |
| |
| return NULL; |
| } |
| |
| static gboolean |
| gst_h264_parse_nalu_header (GstH264NalUnit * nalu) |
| { |
| guint8 *data = nalu->data + nalu->offset; |
| |
| if (nalu->size < 1) |
| return FALSE; |
| |
| nalu->type = (data[0] & 0x1f); |
| nalu->ref_idc = (data[0] & 0x60) >> 5; |
| nalu->idr_pic_flag = (nalu->type == 5 ? 1 : 0); |
| |
| GST_DEBUG ("Nal type %u, ref_idc %u", nalu->type, nalu->ref_idc); |
| return TRUE; |
| } |
| |
| /****** Parsing functions *****/ |
| |
| static gboolean |
| gst_h264_parse_hrd_parameters (GstH264HRDParams * hrd, NalReader * nr) |
| { |
| guint sched_sel_idx; |
| |
| GST_DEBUG ("parsing \"HRD Parameters\""); |
| |
| READ_UE_ALLOWED (nr, hrd->cpb_cnt_minus1, 0, 31); |
| READ_UINT8 (nr, hrd->bit_rate_scale, 4); |
| READ_UINT8 (nr, hrd->cpb_size_scale, 4); |
| |
| for (sched_sel_idx = 0; sched_sel_idx <= hrd->cpb_cnt_minus1; sched_sel_idx++) { |
| READ_UE (nr, hrd->bit_rate_value_minus1[sched_sel_idx]); |
| READ_UE (nr, hrd->cpb_size_value_minus1[sched_sel_idx]); |
| READ_UINT8 (nr, hrd->cbr_flag[sched_sel_idx], 1); |
| } |
| |
| READ_UINT8 (nr, hrd->initial_cpb_removal_delay_length_minus1, 5); |
| READ_UINT8 (nr, hrd->cpb_removal_delay_length_minus1, 5); |
| READ_UINT8 (nr, hrd->dpb_output_delay_length_minus1, 5); |
| READ_UINT8 (nr, hrd->time_offset_length, 5); |
| |
| return TRUE; |
| |
| error: |
| GST_WARNING ("error parsing \"HRD Parameters\""); |
| return FALSE; |
| } |
| |
| static gboolean |
| gst_h264_parse_vui_parameters (GstH264SPS * sps, NalReader * nr) |
| { |
| GstH264VUIParams *vui = &sps->vui_parameters; |
| |
| GST_DEBUG ("parsing \"VUI Parameters\""); |
| |
| /* set default values for fields that might not be present in the bitstream |
| and have valid defaults */ |
| vui->aspect_ratio_idc = 0; |
| vui->video_format = 5; |
| vui->video_full_range_flag = 0; |
| vui->colour_primaries = 2; |
| vui->transfer_characteristics = 2; |
| vui->matrix_coefficients = 2; |
| vui->chroma_sample_loc_type_top_field = 0; |
| vui->chroma_sample_loc_type_bottom_field = 0; |
| vui->low_delay_hrd_flag = 0; |
| vui->par_n = 0; |
| vui->par_d = 0; |
| |
| READ_UINT8 (nr, vui->aspect_ratio_info_present_flag, 1); |
| if (vui->aspect_ratio_info_present_flag) { |
| READ_UINT8 (nr, vui->aspect_ratio_idc, 8); |
| if (vui->aspect_ratio_idc == EXTENDED_SAR) { |
| READ_UINT16 (nr, vui->sar_width, 16); |
| READ_UINT16 (nr, vui->sar_height, 16); |
| vui->par_n = vui->sar_width; |
| vui->par_d = vui->sar_height; |
| } else if (vui->aspect_ratio_idc <= 16) { |
| vui->par_n = aspect_ratios[vui->aspect_ratio_idc].par_n; |
| vui->par_d = aspect_ratios[vui->aspect_ratio_idc].par_d; |
| } |
| } |
| |
| READ_UINT8 (nr, vui->overscan_info_present_flag, 1); |
| if (vui->overscan_info_present_flag) |
| READ_UINT8 (nr, vui->overscan_appropriate_flag, 1); |
| |
| READ_UINT8 (nr, vui->video_signal_type_present_flag, 1); |
| if (vui->video_signal_type_present_flag) { |
| |
| READ_UINT8 (nr, vui->video_format, 3); |
| READ_UINT8 (nr, vui->video_full_range_flag, 1); |
| READ_UINT8 (nr, vui->colour_description_present_flag, 1); |
| if (vui->colour_description_present_flag) { |
| READ_UINT8 (nr, vui->colour_primaries, 8); |
| READ_UINT8 (nr, vui->transfer_characteristics, 8); |
| READ_UINT8 (nr, vui->matrix_coefficients, 8); |
| } |
| } |
| |
| READ_UINT8 (nr, vui->chroma_loc_info_present_flag, 1); |
| if (vui->chroma_loc_info_present_flag) { |
| READ_UE_ALLOWED (nr, vui->chroma_sample_loc_type_top_field, 0, 5); |
| READ_UE_ALLOWED (nr, vui->chroma_sample_loc_type_bottom_field, 0, 5); |
| } |
| |
| READ_UINT8 (nr, vui->timing_info_present_flag, 1); |
| if (vui->timing_info_present_flag) { |
| READ_UINT32 (nr, vui->num_units_in_tick, 32); |
| if (vui->num_units_in_tick == 0) |
| GST_WARNING ("num_units_in_tick = 0 detected in stream " |
| "(incompliant to H.264 E.2.1)."); |
| |
| READ_UINT32 (nr, vui->time_scale, 32); |
| if (vui->time_scale == 0) |
| GST_WARNING ("time_scale = 0 detected in stream " |
| "(incompliant to H.264 E.2.1)."); |
| |
| READ_UINT8 (nr, vui->fixed_frame_rate_flag, 1); |
| } |
| |
| READ_UINT8 (nr, vui->nal_hrd_parameters_present_flag, 1); |
| if (vui->nal_hrd_parameters_present_flag) { |
| if (!gst_h264_parse_hrd_parameters (&vui->nal_hrd_parameters, nr)) |
| goto error; |
| } |
| |
| READ_UINT8 (nr, vui->vcl_hrd_parameters_present_flag, 1); |
| if (vui->vcl_hrd_parameters_present_flag) { |
| if (!gst_h264_parse_hrd_parameters (&vui->vcl_hrd_parameters, nr)) |
| goto error; |
| } |
| |
| if (vui->nal_hrd_parameters_present_flag || |
| vui->vcl_hrd_parameters_present_flag) |
| READ_UINT8 (nr, vui->low_delay_hrd_flag, 1); |
| |
| READ_UINT8 (nr, vui->pic_struct_present_flag, 1); |
| READ_UINT8 (nr, vui->bitstream_restriction_flag, 1); |
| if (vui->bitstream_restriction_flag) { |
| READ_UINT8 (nr, vui->motion_vectors_over_pic_boundaries_flag, 1); |
| READ_UE (nr, vui->max_bytes_per_pic_denom); |
| READ_UE_ALLOWED (nr, vui->max_bits_per_mb_denom, 0, 16); |
| READ_UE_ALLOWED (nr, vui->log2_max_mv_length_horizontal, 0, 16); |
| READ_UE_ALLOWED (nr, vui->log2_max_mv_length_vertical, 0, 16); |
| READ_UE (nr, vui->num_reorder_frames); |
| READ_UE (nr, vui->max_dec_frame_buffering); |
| } |
| |
| return TRUE; |
| |
| error: |
| GST_WARNING ("error parsing \"VUI Parameters\""); |
| return FALSE; |
| } |
| |
| static gboolean |
| gst_h264_parser_parse_scaling_list (NalReader * nr, |
| guint8 scaling_lists_4x4[6][16], guint8 scaling_lists_8x8[6][64], |
| const guint8 fallback_4x4_inter[16], const guint8 fallback_4x4_intra[16], |
| const guint8 fallback_8x8_inter[64], const guint8 fallback_8x8_intra[64], |
| guint8 n_lists) |
| { |
| guint i; |
| |
| static const guint8 *default_lists[12] = { |
| default_4x4_intra, default_4x4_intra, default_4x4_intra, |
| default_4x4_inter, default_4x4_inter, default_4x4_inter, |
| default_8x8_intra, default_8x8_inter, |
| default_8x8_intra, default_8x8_inter, |
| default_8x8_intra, default_8x8_inter |
| }; |
| |
| GST_DEBUG ("parsing scaling lists"); |
| |
| for (i = 0; i < 12; i++) { |
| gboolean use_default = FALSE; |
| |
| if (i < n_lists) { |
| guint8 scaling_list_present_flag; |
| |
| READ_UINT8 (nr, scaling_list_present_flag, 1); |
| if (scaling_list_present_flag) { |
| guint8 *scaling_list; |
| guint size; |
| guint j; |
| guint8 last_scale, next_scale; |
| |
| if (i < 6) { |
| scaling_list = scaling_lists_4x4[i]; |
| size = 16; |
| } else { |
| scaling_list = scaling_lists_8x8[i - 6]; |
| size = 64; |
| } |
| |
| last_scale = 8; |
| next_scale = 8; |
| for (j = 0; j < size; j++) { |
| if (next_scale != 0) { |
| gint32 delta_scale; |
| |
| READ_SE (nr, delta_scale); |
| next_scale = (last_scale + delta_scale) & 0xff; |
| } |
| if (j == 0 && next_scale == 0) { |
| /* Use default scaling lists (7.4.2.1.1.1) */ |
| memcpy (scaling_list, default_lists[i], size); |
| break; |
| } |
| last_scale = scaling_list[j] = |
| (next_scale == 0) ? last_scale : next_scale; |
| } |
| } else |
| use_default = TRUE; |
| } else |
| use_default = TRUE; |
| |
| if (use_default) { |
| switch (i) { |
| case 0: |
| memcpy (scaling_lists_4x4[0], fallback_4x4_intra, 16); |
| break; |
| case 1: |
| memcpy (scaling_lists_4x4[1], scaling_lists_4x4[0], 16); |
| break; |
| case 2: |
| memcpy (scaling_lists_4x4[2], scaling_lists_4x4[1], 16); |
| break; |
| case 3: |
| memcpy (scaling_lists_4x4[3], fallback_4x4_inter, 16); |
| break; |
| case 4: |
| memcpy (scaling_lists_4x4[4], scaling_lists_4x4[3], 16); |
| break; |
| case 5: |
| memcpy (scaling_lists_4x4[5], scaling_lists_4x4[4], 16); |
| break; |
| case 6: |
| memcpy (scaling_lists_8x8[0], fallback_8x8_intra, 64); |
| break; |
| case 7: |
| memcpy (scaling_lists_8x8[1], fallback_8x8_inter, 64); |
| break; |
| case 8: |
| memcpy (scaling_lists_8x8[2], scaling_lists_8x8[0], 64); |
| break; |
| case 9: |
| memcpy (scaling_lists_8x8[3], scaling_lists_8x8[1], 64); |
| break; |
| case 10: |
| memcpy (scaling_lists_8x8[4], scaling_lists_8x8[2], 64); |
| break; |
| case 11: |
| memcpy (scaling_lists_8x8[5], scaling_lists_8x8[3], 64); |
| break; |
| |
| default: |
| break; |
| } |
| } |
| } |
| |
| return TRUE; |
| |
| error: |
| GST_WARNING ("error parsing scaling lists"); |
| return FALSE; |
| } |
| |
| static gboolean |
| slice_parse_ref_pic_list_modification_1 (GstH264SliceHdr * slice, |
| NalReader * nr, guint list) |
| { |
| GstH264RefPicListModification *entries; |
| guint8 *ref_pic_list_modification_flag, *n_ref_pic_list_modification; |
| guint32 modification_of_pic_nums_idc; |
| guint i = 0; |
| |
| if (list == 0) { |
| entries = slice->ref_pic_list_modification_l0; |
| ref_pic_list_modification_flag = &slice->ref_pic_list_modification_flag_l0; |
| n_ref_pic_list_modification = &slice->n_ref_pic_list_modification_l0; |
| } else { |
| entries = slice->ref_pic_list_modification_l1; |
| ref_pic_list_modification_flag = &slice->ref_pic_list_modification_flag_l1; |
| n_ref_pic_list_modification = &slice->n_ref_pic_list_modification_l1; |
| } |
| |
| READ_UINT8 (nr, *ref_pic_list_modification_flag, 1); |
| if (*ref_pic_list_modification_flag) { |
| while (1) { |
| READ_UE (nr, modification_of_pic_nums_idc); |
| if (modification_of_pic_nums_idc == 3) |
| break; |
| if (modification_of_pic_nums_idc == 0 || |
| modification_of_pic_nums_idc == 1) { |
| READ_UE_ALLOWED (nr, entries[i].value.abs_diff_pic_num_minus1, 0, |
| slice->max_pic_num - 1); |
| } else if (modification_of_pic_nums_idc == 2) { |
| READ_UE (nr, entries[i].value.long_term_pic_num); |
| } |
| entries[i++].modification_of_pic_nums_idc = modification_of_pic_nums_idc; |
| } |
| } |
| *n_ref_pic_list_modification = i; |
| return TRUE; |
| |
| error: |
| GST_WARNING ("error parsing \"Reference picture list %u modification\"", |
| list); |
| return FALSE; |
| } |
| |
| static gboolean |
| slice_parse_ref_pic_list_modification (GstH264SliceHdr * slice, NalReader * nr) |
| { |
| if (!GST_H264_IS_I_SLICE (slice) && !GST_H264_IS_SI_SLICE (slice)) { |
| if (!slice_parse_ref_pic_list_modification_1 (slice, nr, 0)) |
| return FALSE; |
| } |
| |
| if (GST_H264_IS_B_SLICE (slice)) { |
| if (!slice_parse_ref_pic_list_modification_1 (slice, nr, 1)) |
| return FALSE; |
| } |
| return TRUE; |
| } |
| |
| static gboolean |
| gst_h264_slice_parse_dec_ref_pic_marking (GstH264SliceHdr * slice, |
| GstH264NalUnit * nalu, NalReader * nr) |
| { |
| GstH264DecRefPicMarking *dec_ref_pic_m; |
| |
| GST_DEBUG ("parsing \"Decoded reference picture marking\""); |
| |
| dec_ref_pic_m = &slice->dec_ref_pic_marking; |
| |
| if (nalu->idr_pic_flag) { |
| READ_UINT8 (nr, dec_ref_pic_m->no_output_of_prior_pics_flag, 1); |
| READ_UINT8 (nr, dec_ref_pic_m->long_term_reference_flag, 1); |
| } else { |
| READ_UINT8 (nr, dec_ref_pic_m->adaptive_ref_pic_marking_mode_flag, 1); |
| if (dec_ref_pic_m->adaptive_ref_pic_marking_mode_flag) { |
| guint32 mem_mgmt_ctrl_op; |
| GstH264RefPicMarking *refpicmarking; |
| |
| dec_ref_pic_m->n_ref_pic_marking = 0; |
| while (1) { |
| refpicmarking = |
| &dec_ref_pic_m->ref_pic_marking[dec_ref_pic_m->n_ref_pic_marking]; |
| |
| READ_UE (nr, mem_mgmt_ctrl_op); |
| if (mem_mgmt_ctrl_op == 0) |
| break; |
| |
| refpicmarking->memory_management_control_operation = mem_mgmt_ctrl_op; |
| |
| if (mem_mgmt_ctrl_op == 1 || mem_mgmt_ctrl_op == 3) |
| READ_UE (nr, refpicmarking->difference_of_pic_nums_minus1); |
| |
| if (mem_mgmt_ctrl_op == 2) |
| READ_UE (nr, refpicmarking->long_term_pic_num); |
| |
| if (mem_mgmt_ctrl_op == 3 || mem_mgmt_ctrl_op == 6) |
| READ_UE (nr, refpicmarking->long_term_frame_idx); |
| |
| if (mem_mgmt_ctrl_op == 4) |
| READ_UE (nr, refpicmarking->max_long_term_frame_idx_plus1); |
| |
| dec_ref_pic_m->n_ref_pic_marking++; |
| } |
| } |
| } |
| |
| return TRUE; |
| |
| error: |
| GST_WARNING ("error parsing \"Decoded reference picture marking\""); |
| return FALSE; |
| } |
| |
| static gboolean |
| gst_h264_slice_parse_pred_weight_table (GstH264SliceHdr * slice, |
| NalReader * nr, guint8 chroma_array_type) |
| { |
| GstH264PredWeightTable *p; |
| gint16 default_luma_weight, default_chroma_weight; |
| gint i; |
| |
| GST_DEBUG ("parsing \"Prediction weight table\""); |
| |
| p = &slice->pred_weight_table; |
| |
| READ_UE_ALLOWED (nr, p->luma_log2_weight_denom, 0, 7); |
| /* set default values */ |
| default_luma_weight = 1 << p->luma_log2_weight_denom; |
| for (i = 0; i < G_N_ELEMENTS (p->luma_weight_l0); i++) |
| p->luma_weight_l0[i] = default_luma_weight; |
| memset (p->luma_offset_l0, 0, sizeof (p->luma_offset_l0)); |
| if (GST_H264_IS_B_SLICE (slice)) { |
| for (i = 0; i < G_N_ELEMENTS (p->luma_weight_l1); i++) |
| p->luma_weight_l1[i] = default_luma_weight; |
| memset (p->luma_offset_l1, 0, sizeof (p->luma_offset_l1)); |
| } |
| |
| if (chroma_array_type != 0) { |
| READ_UE_ALLOWED (nr, p->chroma_log2_weight_denom, 0, 7); |
| /* set default values */ |
| default_chroma_weight = 1 << p->chroma_log2_weight_denom; |
| for (i = 0; i < G_N_ELEMENTS (p->chroma_weight_l0); i++) { |
| p->chroma_weight_l0[i][0] = default_chroma_weight; |
| p->chroma_weight_l0[i][1] = default_chroma_weight; |
| } |
| memset (p->chroma_offset_l0, 0, sizeof (p->chroma_offset_l0)); |
| if (GST_H264_IS_B_SLICE (slice)) { |
| for (i = 0; i < G_N_ELEMENTS (p->chroma_weight_l1); i++) { |
| p->chroma_weight_l1[i][0] = default_chroma_weight; |
| p->chroma_weight_l1[i][1] = default_chroma_weight; |
| } |
| memset (p->chroma_offset_l1, 0, sizeof (p->chroma_offset_l1)); |
| } |
| } |
| |
| for (i = 0; i <= slice->num_ref_idx_l0_active_minus1; i++) { |
| guint8 luma_weight_l0_flag; |
| |
| READ_UINT8 (nr, luma_weight_l0_flag, 1); |
| if (luma_weight_l0_flag) { |
| READ_SE_ALLOWED (nr, p->luma_weight_l0[i], -128, 127); |
| READ_SE_ALLOWED (nr, p->luma_offset_l0[i], -128, 127); |
| } |
| if (chroma_array_type != 0) { |
| guint8 chroma_weight_l0_flag; |
| gint j; |
| |
| READ_UINT8 (nr, chroma_weight_l0_flag, 1); |
| if (chroma_weight_l0_flag) { |
| for (j = 0; j < 2; j++) { |
| READ_SE_ALLOWED (nr, p->chroma_weight_l0[i][j], -128, 127); |
| READ_SE_ALLOWED (nr, p->chroma_offset_l0[i][j], -128, 127); |
| } |
| } |
| } |
| } |
| |
| if (GST_H264_IS_B_SLICE (slice)) { |
| for (i = 0; i <= slice->num_ref_idx_l1_active_minus1; i++) { |
| guint8 luma_weight_l1_flag; |
| |
| READ_UINT8 (nr, luma_weight_l1_flag, 1); |
| if (luma_weight_l1_flag) { |
| READ_SE_ALLOWED (nr, p->luma_weight_l1[i], -128, 127); |
| READ_SE_ALLOWED (nr, p->luma_offset_l1[i], -128, 127); |
| } |
| if (chroma_array_type != 0) { |
| guint8 chroma_weight_l1_flag; |
| gint j; |
| |
| READ_UINT8 (nr, chroma_weight_l1_flag, 1); |
| if (chroma_weight_l1_flag) { |
| for (j = 0; j < 2; j++) { |
| READ_SE_ALLOWED (nr, p->chroma_weight_l1[i][j], -128, 127); |
| READ_SE_ALLOWED (nr, p->chroma_offset_l1[i][j], -128, 127); |
| } |
| } |
| } |
| } |
| } |
| |
| return TRUE; |
| |
| error: |
| GST_WARNING ("error parsing \"Prediction weight table\""); |
| return FALSE; |
| } |
| |
| static GstH264ParserResult |
| gst_h264_parser_parse_buffering_period (GstH264NalParser * nalparser, |
| GstH264BufferingPeriod * per, NalReader * nr) |
| { |
| GstH264SPS *sps; |
| guint8 sps_id; |
| |
| GST_DEBUG ("parsing \"Buffering period\""); |
| |
| READ_UE_ALLOWED (nr, sps_id, 0, GST_H264_MAX_SPS_COUNT - 1); |
| sps = gst_h264_parser_get_sps (nalparser, sps_id); |
| if (!sps) { |
| GST_WARNING ("couldn't find associated sequence parameter set with id: %d", |
| sps_id); |
| return GST_H264_PARSER_BROKEN_LINK; |
| } |
| per->sps = sps; |
| |
| if (sps->vui_parameters_present_flag) { |
| GstH264VUIParams *vui = &sps->vui_parameters; |
| |
| if (vui->nal_hrd_parameters_present_flag) { |
| GstH264HRDParams *hrd = &vui->nal_hrd_parameters; |
| const guint8 nbits = hrd->initial_cpb_removal_delay_length_minus1 + 1; |
| guint8 sched_sel_idx; |
| |
| for (sched_sel_idx = 0; sched_sel_idx <= hrd->cpb_cnt_minus1; |
| sched_sel_idx++) { |
| READ_UINT8 (nr, per->nal_initial_cpb_removal_delay[sched_sel_idx], |
| nbits); |
| READ_UINT8 (nr, |
| per->nal_initial_cpb_removal_delay_offset[sched_sel_idx], nbits); |
| } |
| } |
| |
| if (vui->vcl_hrd_parameters_present_flag) { |
| GstH264HRDParams *hrd = &vui->vcl_hrd_parameters; |
| const guint8 nbits = hrd->initial_cpb_removal_delay_length_minus1 + 1; |
| guint8 sched_sel_idx; |
| |
| for (sched_sel_idx = 0; sched_sel_idx <= hrd->cpb_cnt_minus1; |
| sched_sel_idx++) { |
| READ_UINT8 (nr, per->vcl_initial_cpb_removal_delay[sched_sel_idx], |
| nbits); |
| READ_UINT8 (nr, |
| per->vcl_initial_cpb_removal_delay_offset[sched_sel_idx], nbits); |
| } |
| } |
| } |
| |
| return GST_H264_PARSER_OK; |
| |
| error: |
| GST_WARNING ("error parsing \"Buffering period\""); |
| return GST_H264_PARSER_ERROR; |
| } |
| |
| static gboolean |
| gst_h264_parse_clock_timestamp (GstH264ClockTimestamp * tim, |
| GstH264VUIParams * vui, NalReader * nr) |
| { |
| guint8 full_timestamp_flag; |
| guint8 time_offset_length; |
| |
| GST_DEBUG ("parsing \"Clock timestamp\""); |
| |
| /* defalt values */ |
| tim->time_offset = 0; |
| |
| READ_UINT8 (nr, tim->ct_type, 2); |
| READ_UINT8 (nr, tim->nuit_field_based_flag, 1); |
| READ_UINT8 (nr, tim->counting_type, 5); |
| READ_UINT8 (nr, full_timestamp_flag, 1); |
| READ_UINT8 (nr, tim->discontinuity_flag, 1); |
| READ_UINT8 (nr, tim->cnt_dropped_flag, 1); |
| READ_UINT8 (nr, tim->n_frames, 8); |
| |
| if (full_timestamp_flag) { |
| tim->seconds_flag = TRUE; |
| READ_UINT8 (nr, tim->seconds_value, 6); |
| |
| tim->minutes_flag = TRUE; |
| READ_UINT8 (nr, tim->minutes_value, 6); |
| |
| tim->hours_flag = TRUE; |
| READ_UINT8 (nr, tim->hours_value, 5); |
| } else { |
| READ_UINT8 (nr, tim->seconds_flag, 1); |
| if (tim->seconds_flag) { |
| READ_UINT8 (nr, tim->seconds_value, 6); |
| READ_UINT8 (nr, tim->minutes_flag, 1); |
| if (tim->minutes_flag) { |
| READ_UINT8 (nr, tim->minutes_value, 6); |
| READ_UINT8 (nr, tim->hours_flag, 1); |
| if (tim->hours_flag) |
| READ_UINT8 (nr, tim->hours_value, 5); |
| } |
| } |
| } |
| |
| time_offset_length = 0; |
| if (vui->nal_hrd_parameters_present_flag) |
| time_offset_length = vui->nal_hrd_parameters.time_offset_length; |
| else if (vui->vcl_hrd_parameters_present_flag) |
| time_offset_length = vui->vcl_hrd_parameters.time_offset_length; |
| |
| if (time_offset_length > 0) |
| READ_UINT32 (nr, tim->time_offset, time_offset_length); |
| |
| return TRUE; |
| |
| error: |
| GST_WARNING ("error parsing \"Clock timestamp\""); |
| return FALSE; |
| } |
| |
| static GstH264ParserResult |
| gst_h264_parser_parse_pic_timing (GstH264NalParser * nalparser, |
| GstH264PicTiming * tim, NalReader * nr) |
| { |
| GST_DEBUG ("parsing \"Picture timing\""); |
| if (!nalparser->last_sps || !nalparser->last_sps->valid) { |
| GST_WARNING ("didn't get the associated sequence paramater set for the " |
| "current access unit"); |
| goto error; |
| } |
| |
| /* default values */ |
| memset (tim->clock_timestamp_flag, 0, 3); |
| |
| if (nalparser->last_sps->vui_parameters_present_flag) { |
| GstH264VUIParams *vui = &nalparser->last_sps->vui_parameters; |
| |
| if (vui->nal_hrd_parameters_present_flag) { |
| READ_UINT32 (nr, tim->cpb_removal_delay, |
| vui->nal_hrd_parameters.cpb_removal_delay_length_minus1 + 1); |
| READ_UINT32 (nr, tim->dpb_output_delay, |
| vui->nal_hrd_parameters.dpb_output_delay_length_minus1 + 1); |
| } else if (vui->vcl_hrd_parameters_present_flag) { |
| READ_UINT32 (nr, tim->cpb_removal_delay, |
| vui->vcl_hrd_parameters.cpb_removal_delay_length_minus1 + 1); |
| READ_UINT32 (nr, tim->dpb_output_delay, |
| vui->vcl_hrd_parameters.dpb_output_delay_length_minus1 + 1); |
| } |
| |
| if (vui->pic_struct_present_flag) { |
| const guint8 num_clock_ts_table[9] = { |
| 1, 1, 1, 2, 2, 3, 3, 2, 3 |
| }; |
| guint8 num_clock_num_ts; |
| guint i; |
| |
| tim->pic_struct_present_flag = TRUE; |
| READ_UINT8 (nr, tim->pic_struct, 4); |
| CHECK_ALLOWED ((gint8) tim->pic_struct, 0, 8); |
| |
| num_clock_num_ts = num_clock_ts_table[tim->pic_struct]; |
| for (i = 0; i < num_clock_num_ts; i++) { |
| READ_UINT8 (nr, tim->clock_timestamp_flag[i], 1); |
| if (tim->clock_timestamp_flag[i]) { |
| if (!gst_h264_parse_clock_timestamp (&tim->clock_timestamp[i], vui, |
| nr)) |
| goto error; |
| } |
| } |
| } |
| } |
| |
| return GST_H264_PARSER_OK; |
| |
| error: |
| GST_WARNING ("error parsing \"Picture timing\""); |
| return GST_H264_PARSER_ERROR; |
| } |
| |
| static GstH264ParserResult |
| gst_h264_parser_parse_sei_message (GstH264NalParser * nalparser, |
| NalReader * nr, GstH264SEIMessage * sei) |
| { |
| guint32 payloadSize; |
| guint8 payload_type_byte, payload_size_byte; |
| guint remaining, payload_size; |
| GstH264ParserResult res; |
| |
| GST_DEBUG ("parsing \"Sei message\""); |
| |
| sei->payloadType = 0; |
| do { |
| READ_UINT8 (nr, payload_type_byte, 8); |
| sei->payloadType += payload_type_byte; |
| } while (payload_type_byte == 0xff); |
| |
| payloadSize = 0; |
| do { |
| READ_UINT8 (nr, payload_size_byte, 8); |
| payloadSize += payload_size_byte; |
| } |
| while (payload_size_byte == 0xff); |
| |
| remaining = nal_reader_get_remaining (nr); |
| payload_size = payloadSize * 8 < remaining ? payloadSize * 8 : remaining; |
| |
| GST_DEBUG ("SEI message received: payloadType %u, payloadSize = %u bits", |
| sei->payloadType, payload_size); |
| |
| switch (sei->payloadType) { |
| case GST_H264_SEI_BUF_PERIOD: |
| /* size not set; might depend on emulation_prevention_three_byte */ |
| res = gst_h264_parser_parse_buffering_period (nalparser, |
| &sei->payload.buffering_period, nr); |
| break; |
| case GST_H264_SEI_PIC_TIMING: |
| /* size not set; might depend on emulation_prevention_three_byte */ |
| res = gst_h264_parser_parse_pic_timing (nalparser, |
| &sei->payload.pic_timing, nr); |
| break; |
| default:{ |
| /* Just consume payloadSize bytes, which does not account for |
| emulation prevention bytes */ |
| guint nbits = payload_size % 8; |
| while (payload_size > 0) { |
| nal_reader_skip (nr, nbits); |
| payload_size -= nbits; |
| nbits = 8; |
| } |
| res = GST_H264_PARSER_OK; |
| break; |
| } |
| } |
| |
| /* When SEI message doesn't end at byte boundary, |
| * check remaining bits fit the specification. |
| */ |
| if (!nal_reader_is_byte_aligned (nr)) { |
| guint8 bit_equal_to_one; |
| READ_UINT8 (nr, bit_equal_to_one, 1); |
| if (!bit_equal_to_one) |
| GST_WARNING ("Bit non equal to one."); |
| |
| while (!nal_reader_is_byte_aligned (nr)) { |
| guint8 bit_equal_to_zero; |
| READ_UINT8 (nr, bit_equal_to_zero, 1); |
| if (bit_equal_to_zero) |
| GST_WARNING ("Bit non equal to zero."); |
| } |
| } |
| |
| return res; |
| |
| error: |
| GST_WARNING ("error parsing \"Sei message\""); |
| return GST_H264_PARSER_ERROR; |
| } |
| |
| /******** API *************/ |
| |
| /** |
| * gst_h264_nal_parser_new: |
| * |
| * Creates a new #GstH264NalParser. It should be freed with |
| * gst_h264_nal_parser_free after use. |
| * |
| * Returns: a new #GstH264NalParser |
| */ |
| GstH264NalParser * |
| gst_h264_nal_parser_new (void) |
| { |
| GstH264NalParser *nalparser; |
| |
| nalparser = g_slice_new0 (GstH264NalParser); |
| INITIALIZE_DEBUG_CATEGORY; |
| |
| return nalparser; |
| } |
| |
| /** |
| * gst_h264_nal_parser_free: |
| * @nalparser: the #GstH264NalParser to free |
| * |
| * Frees @nalparser and sets it to %NULL |
| */ |
| void |
| gst_h264_nal_parser_free (GstH264NalParser * nalparser) |
| { |
| g_slice_free (GstH264NalParser, nalparser); |
| |
| nalparser = NULL; |
| } |
| |
| /** |
| * gst_h264_parser_identify_nalu_unchecked: |
| * @nalparser: a #GstH264NalParser |
| * @data: The data to parse |
| * @offset: the offset from which to parse @data |
| * @size: the size of @data |
| * @nalu: The #GstH264NalUnit where to store parsed nal headers |
| * |
| * Parses @data and fills @nalu from the next nalu data from @data. |
| * |
| * This differs from @gst_h264_parser_identify_nalu in that it doesn't |
| * check whether the packet is complete or not. |
| * |
| * Note: Only use this function if you already know the provided @data |
| * is a complete NALU, else use @gst_h264_parser_identify_nalu. |
| * |
| * Returns: a #GstH264ParserResult |
| */ |
| GstH264ParserResult |
| gst_h264_parser_identify_nalu_unchecked (GstH264NalParser * nalparser, |
| const guint8 * data, guint offset, gsize size, GstH264NalUnit * nalu) |
| { |
| gint off1; |
| |
| if (size < offset + 4) { |
| GST_DEBUG ("Can't parse, buffer has too small size %" G_GSIZE_FORMAT |
| ", offset %u", size, offset); |
| return GST_H264_PARSER_ERROR; |
| } |
| |
| off1 = scan_for_start_codes (data + offset, size - offset); |
| |
| if (off1 < 0) { |
| GST_DEBUG ("No start code prefix in this buffer"); |
| return GST_H264_PARSER_NO_NAL; |
| } |
| |
| if (offset + off1 == size - 1) { |
| GST_DEBUG ("Missing data to identify nal unit"); |
| |
| return GST_H264_PARSER_ERROR; |
| } |
| |
| nalu->sc_offset = offset + off1; |
| |
| |
| nalu->offset = offset + off1 + 3; |
| nalu->data = (guint8 *) data; |
| nalu->size = size - nalu->offset; |
| |
| if (!gst_h264_parse_nalu_header (nalu)) { |
| GST_WARNING ("error parsing \"NAL unit header\""); |
| nalu->size = 0; |
| return GST_H264_PARSER_BROKEN_DATA; |
| } |
| |
| nalu->valid = TRUE; |
| |
| /* sc might have 2 or 3 0-bytes */ |
| if (nalu->sc_offset > 0 && data[nalu->sc_offset - 1] == 00 |
| && (nalu->type == GST_H264_NAL_SPS || nalu->type == GST_H264_NAL_PPS |
| || nalu->type == GST_H264_NAL_AU_DELIMITER)) |
| nalu->sc_offset--; |
| |
| if (nalu->type == GST_H264_NAL_SEQ_END || |
| nalu->type == GST_H264_NAL_STREAM_END) { |
| GST_DEBUG ("end-of-seq or end-of-stream nal found"); |
| nalu->size = 0; |
| return GST_H264_PARSER_OK; |
| } |
| |
| return GST_H264_PARSER_OK; |
| } |
| |
| /** |
| * gst_h264_parser_identify_nalu: |
| * @nalparser: a #GstH264NalParser |
| * @data: The data to parse |
| * @offset: the offset from which to parse @data |
| * @size: the size of @data |
| * @nalu: The #GstH264NalUnit where to store parsed nal headers |
| * |
| * Parses @data and fills @nalu from the next nalu data from @data |
| * |
| * Returns: a #GstH264ParserResult |
| */ |
| GstH264ParserResult |
| gst_h264_parser_identify_nalu (GstH264NalParser * nalparser, |
| const guint8 * data, guint offset, gsize size, GstH264NalUnit * nalu) |
| { |
| GstH264ParserResult res; |
| gint off2; |
| |
| res = |
| gst_h264_parser_identify_nalu_unchecked (nalparser, data, offset, size, |
| nalu); |
| |
| if (res != GST_H264_PARSER_OK || nalu->size == 0) |
| goto beach; |
| |
| off2 = scan_for_start_codes (data + nalu->offset, size - nalu->offset); |
| if (off2 < 0) { |
| GST_DEBUG ("Nal start %d, No end found", nalu->offset); |
| |
| return GST_H264_PARSER_NO_NAL_END; |
| } |
| |
| /* Mini performance improvement: |
| * We could have a way to store how many 0s were skipped to avoid |
| * parsing them again on the next NAL */ |
| while (off2 > 0 && data[nalu->offset + off2 - 1] == 00) |
| off2--; |
| |
| nalu->size = off2; |
| if (nalu->size < 2) |
| return GST_H264_PARSER_BROKEN_DATA; |
| |
| GST_DEBUG ("Complete nal found. Off: %d, Size: %d", nalu->offset, nalu->size); |
| |
| beach: |
| return res; |
| } |
| |
| |
| /** |
| * gst_h264_parser_identify_nalu_avc: |
| * @nalparser: a #GstH264NalParser |
| * @data: The data to parse, must be the beging of the Nal unit |
| * @offset: the offset from which to parse @data |
| * @size: the size of @data |
| * @nal_length_size: the size in bytes of the AVC nal length prefix. |
| * @nalu: The #GstH264NalUnit where to store parsed nal headers |
| * |
| * Parses @data and sets @nalu. |
| * |
| * Returns: a #GstH264ParserResult |
| */ |
| GstH264ParserResult |
| gst_h264_parser_identify_nalu_avc (GstH264NalParser * nalparser, |
| const guint8 * data, guint offset, gsize size, guint8 nal_length_size, |
| GstH264NalUnit * nalu) |
| { |
| GstBitReader br; |
| |
| if (size < offset + nal_length_size) { |
| GST_DEBUG ("Can't parse, buffer has too small size %" G_GSIZE_FORMAT |
| ", offset %u", size, offset); |
| return GST_H264_PARSER_ERROR; |
| } |
| |
| size = size - offset; |
| gst_bit_reader_init (&br, data + offset, size); |
| |
| nalu->size = gst_bit_reader_get_bits_uint32_unchecked (&br, |
| nal_length_size * 8); |
| nalu->sc_offset = offset; |
| nalu->offset = offset + nal_length_size; |
| |
| if (size < nalu->size + nal_length_size) { |
| nalu->size = 0; |
| |
| return GST_H264_PARSER_NO_NAL_END; |
| } |
| |
| nalu->data = (guint8 *) data; |
| |
| if (!gst_h264_parse_nalu_header (nalu)) { |
| GST_WARNING ("error parsing \"NAL unit header\""); |
| nalu->size = 0; |
| return GST_H264_PARSER_BROKEN_DATA; |
| } |
| |
| nalu->valid = TRUE; |
| |
| return GST_H264_PARSER_OK; |
| } |
| |
| /** |
| * gst_h264_parser_parse_nal: |
| * @nalparser: a #GstH264NalParser |
| * @nalu: The #GstH264NalUnit to parse |
| * |
| * This function should be called in the case one doesn't need to |
| * parse a specific structure. It is necessary to do so to make |
| * sure @nalparser is up to date. |
| * |
| * Returns: a #GstH264ParserResult |
| */ |
| GstH264ParserResult |
| gst_h264_parser_parse_nal (GstH264NalParser * nalparser, GstH264NalUnit * nalu) |
| { |
| GstH264SPS sps; |
| GstH264PPS pps; |
| |
| switch (nalu->type) { |
| case GST_H264_NAL_SPS: |
| return gst_h264_parser_parse_sps (nalparser, nalu, &sps, FALSE); |
| break; |
| case GST_H264_NAL_PPS: |
| return gst_h264_parser_parse_pps (nalparser, nalu, &pps); |
| } |
| |
| return GST_H264_PARSER_OK; |
| } |
| |
| /** |
| * gst_h264_parser_parse_sps: |
| * @nalparser: a #GstH264NalParser |
| * @nalu: The #GST_H264_NAL_SPS #GstH264NalUnit to parse |
| * @sps: The #GstH264SPS to fill. |
| * @parse_vui_params: Whether to parse the vui_params or not |
| * |
| * Parses @data, and fills the @sps structure. |
| * |
| * Returns: a #GstH264ParserResult |
| */ |
| GstH264ParserResult |
| gst_h264_parser_parse_sps (GstH264NalParser * nalparser, GstH264NalUnit * nalu, |
| GstH264SPS * sps, gboolean parse_vui_params) |
| { |
| GstH264ParserResult res = gst_h264_parse_sps (nalu, sps, parse_vui_params); |
| |
| if (res == GST_H264_PARSER_OK) { |
| GST_DEBUG ("adding sequence parameter set with id: %d to array", sps->id); |
| |
| nalparser->sps[sps->id] = *sps; |
| nalparser->last_sps = &nalparser->sps[sps->id]; |
| } |
| |
| |
| |
| return res; |
| } |
| |
| /* Parse seq_parameter_set_data() */ |
| static gboolean |
| gst_h264_parse_sps_data (NalReader * nr, GstH264SPS * sps, |
| gboolean parse_vui_params) |
| { |
| gint width, height; |
| guint subwc[] = { 1, 2, 2, 1 }; |
| guint subhc[] = { 1, 2, 1, 1 }; |
| GstH264VUIParams *vui = NULL; |
| |
| /* set default values for fields that might not be present in the bitstream |
| and have valid defaults */ |
| sps->chroma_format_idc = 1; |
| sps->separate_colour_plane_flag = 0; |
| sps->bit_depth_luma_minus8 = 0; |
| sps->bit_depth_chroma_minus8 = 0; |
| memset (sps->scaling_lists_4x4, 16, 96); |
| memset (sps->scaling_lists_8x8, 16, 384); |
| memset (&sps->vui_parameters, 0, sizeof (sps->vui_parameters)); |
| sps->mb_adaptive_frame_field_flag = 0; |
| sps->frame_crop_left_offset = 0; |
| sps->frame_crop_right_offset = 0; |
| sps->frame_crop_top_offset = 0; |
| sps->frame_crop_bottom_offset = 0; |
| sps->delta_pic_order_always_zero_flag = 0; |
| |
| READ_UINT8 (nr, sps->profile_idc, 8); |
| READ_UINT8 (nr, sps->constraint_set0_flag, 1); |
| READ_UINT8 (nr, sps->constraint_set1_flag, 1); |
| READ_UINT8 (nr, sps->constraint_set2_flag, 1); |
| READ_UINT8 (nr, sps->constraint_set3_flag, 1); |
| |
| /* skip reserved_zero_4bits */ |
| if (!nal_reader_skip (nr, 4)) |
| goto error; |
| |
| READ_UINT8 (nr, sps->level_idc, 8); |
| |
| READ_UE_ALLOWED (nr, sps->id, 0, GST_H264_MAX_SPS_COUNT - 1); |
| |
| if (sps->profile_idc == 100 || sps->profile_idc == 110 || |
| sps->profile_idc == 122 || sps->profile_idc == 244 || |
| sps->profile_idc == 44 || sps->profile_idc == 83 || |
| sps->profile_idc == 86) { |
| READ_UE_ALLOWED (nr, sps->chroma_format_idc, 0, 3); |
| if (sps->chroma_format_idc == 3) |
| READ_UINT8 (nr, sps->separate_colour_plane_flag, 1); |
| |
| READ_UE_ALLOWED (nr, sps->bit_depth_luma_minus8, 0, 6); |
| READ_UE_ALLOWED (nr, sps->bit_depth_chroma_minus8, 0, 6); |
| READ_UINT8 (nr, sps->qpprime_y_zero_transform_bypass_flag, 1); |
| |
| READ_UINT8 (nr, sps->scaling_matrix_present_flag, 1); |
| if (sps->scaling_matrix_present_flag) { |
| guint8 n_lists; |
| |
| n_lists = (sps->chroma_format_idc != 3) ? 8 : 12; |
| if (!gst_h264_parser_parse_scaling_list (nr, |
| sps->scaling_lists_4x4, sps->scaling_lists_8x8, |
| default_4x4_inter, default_4x4_intra, |
| default_8x8_inter, default_8x8_intra, n_lists)) |
| goto error; |
| } |
| } |
| |
| READ_UE_ALLOWED (nr, sps->log2_max_frame_num_minus4, 0, 12); |
| |
| sps->max_frame_num = 1 << (sps->log2_max_frame_num_minus4 + 4); |
| |
| READ_UE_ALLOWED (nr, sps->pic_order_cnt_type, 0, 2); |
| if (sps->pic_order_cnt_type == 0) { |
| READ_UE_ALLOWED (nr, sps->log2_max_pic_order_cnt_lsb_minus4, 0, 12); |
| } else if (sps->pic_order_cnt_type == 1) { |
| guint i; |
| |
| READ_UINT8 (nr, sps->delta_pic_order_always_zero_flag, 1); |
| READ_SE (nr, sps->offset_for_non_ref_pic); |
| READ_SE (nr, sps->offset_for_top_to_bottom_field); |
| READ_UE_ALLOWED (nr, sps->num_ref_frames_in_pic_order_cnt_cycle, 0, 255); |
| |
| for (i = 0; i < sps->num_ref_frames_in_pic_order_cnt_cycle; i++) |
| READ_SE (nr, sps->offset_for_ref_frame[i]); |
| } |
| |
| READ_UE (nr, sps->num_ref_frames); |
| READ_UINT8 (nr, sps->gaps_in_frame_num_value_allowed_flag, 1); |
| READ_UE (nr, sps->pic_width_in_mbs_minus1); |
| READ_UE (nr, sps->pic_height_in_map_units_minus1); |
| READ_UINT8 (nr, sps->frame_mbs_only_flag, 1); |
| |
| if (!sps->frame_mbs_only_flag) |
| READ_UINT8 (nr, sps->mb_adaptive_frame_field_flag, 1); |
| |
| READ_UINT8 (nr, sps->direct_8x8_inference_flag, 1); |
| READ_UINT8 (nr, sps->frame_cropping_flag, 1); |
| if (sps->frame_cropping_flag) { |
| READ_UE (nr, sps->frame_crop_left_offset); |
| READ_UE (nr, sps->frame_crop_right_offset); |
| READ_UE (nr, sps->frame_crop_top_offset); |
| READ_UE (nr, sps->frame_crop_bottom_offset); |
| } |
| |
| READ_UINT8 (nr, sps->vui_parameters_present_flag, 1); |
| if (sps->vui_parameters_present_flag && parse_vui_params) { |
| if (!gst_h264_parse_vui_parameters (sps, nr)) |
| goto error; |
| vui = &sps->vui_parameters; |
| } |
| |
| /* calculate ChromaArrayType */ |
| if (sps->separate_colour_plane_flag) |
| sps->chroma_array_type = 0; |
| else |
| sps->chroma_array_type = sps->chroma_format_idc; |
| |
| /* Calculate width and height */ |
| width = (sps->pic_width_in_mbs_minus1 + 1); |
| width *= 16; |
| height = (sps->pic_height_in_map_units_minus1 + 1); |
| height *= 16 * (2 - sps->frame_mbs_only_flag); |
| GST_LOG ("initial width=%d, height=%d", width, height); |
| if (width < 0 || height < 0) { |
| GST_WARNING ("invalid width/height in SPS"); |
| goto error; |
| } |
| |
| sps->width = width; |
| sps->height = height; |
| |
| if (sps->frame_cropping_flag) { |
| const guint crop_unit_x = subwc[sps->chroma_format_idc]; |
| const guint crop_unit_y = |
| subhc[sps->chroma_format_idc] * (2 - sps->frame_mbs_only_flag); |
| |
| width -= (sps->frame_crop_left_offset + sps->frame_crop_right_offset) |
| * crop_unit_x; |
| height -= (sps->frame_crop_top_offset + sps->frame_crop_bottom_offset) |
| * crop_unit_y; |
| |
| sps->crop_rect_width = width; |
| sps->crop_rect_height = height; |
| sps->crop_rect_x = sps->frame_crop_left_offset * crop_unit_x; |
| sps->crop_rect_y = sps->frame_crop_top_offset * crop_unit_y; |
| |
| GST_LOG ("crop_rectangle x=%u y=%u width=%u, height=%u", sps->crop_rect_x, |
| sps->crop_rect_y, width, height); |
| } |
| sps->fps_num = 0; |
| sps->fps_den = 1; |
| |
| if (vui && vui->timing_info_present_flag) { |
| /* derive framerate */ |
| /* FIXME verify / also handle other cases */ |
| GST_LOG ("Framerate: %u %u %u %u", parse_vui_params, |
| vui->fixed_frame_rate_flag, sps->frame_mbs_only_flag, |
| vui->pic_struct_present_flag); |
| |
| if (parse_vui_params && vui->fixed_frame_rate_flag) { |
| sps->fps_num = vui->time_scale; |
| sps->fps_den = vui->num_units_in_tick; |
| /* picture is a frame = 2 fields */ |
| sps->fps_den *= 2; |
| GST_LOG ("framerate %d/%d", sps->fps_num, sps->fps_den); |
| } |
| } else { |
| GST_LOG ("No VUI, unknown framerate"); |
| } |
| return TRUE; |
| |
| error: |
| return FALSE; |
| } |
| |
| /** |
| * gst_h264_parse_sps: |
| * @nalu: The #GST_H264_NAL_SPS #GstH264NalUnit to parse |
| * @sps: The #GstH264SPS to fill. |
| * @parse_vui_params: Whether to parse the vui_params or not |
| * |
| * Parses @data, and fills the @sps structure. |
| * |
| * Returns: a #GstH264ParserResult |
| */ |
| GstH264ParserResult |
| gst_h264_parse_sps (GstH264NalUnit * nalu, GstH264SPS * sps, |
| gboolean parse_vui_params) |
| { |
| NalReader nr; |
| |
| INITIALIZE_DEBUG_CATEGORY; |
| GST_DEBUG ("parsing SPS"); |
| |
| nal_reader_init (&nr, nalu->data + nalu->offset + 1, nalu->size - 1); |
| |
| if (!gst_h264_parse_sps_data (&nr, sps, parse_vui_params)) |
| goto error; |
| |
| sps->valid = TRUE; |
| |
| return GST_H264_PARSER_OK; |
| |
| error: |
| GST_WARNING ("error parsing \"Sequence parameter set\""); |
| sps->valid = FALSE; |
| return GST_H264_PARSER_ERROR; |
| } |
| |
| /** |
| * gst_h264_parse_pps: |
| * @nalparser: a #GstH264NalParser |
| * @nalu: The #GST_H264_NAL_PPS #GstH264NalUnit to parse |
| * @pps: The #GstH264PPS to fill. |
| * |
| * Parses @data, and fills the @pps structure. |
| * |
| * Returns: a #GstH264ParserResult |
| */ |
| GstH264ParserResult |
| gst_h264_parse_pps (GstH264NalParser * nalparser, GstH264NalUnit * nalu, |
| GstH264PPS * pps) |
| { |
| NalReader nr; |
| GstH264SPS *sps; |
| gint sps_id; |
| guint8 pic_scaling_matrix_present_flag; |
| gint qp_bd_offset; |
| |
| INITIALIZE_DEBUG_CATEGORY; |
| GST_DEBUG ("parsing PPS"); |
| |
| nal_reader_init (&nr, nalu->data + nalu->offset + 1, nalu->size - 1); |
| |
| READ_UE_ALLOWED (&nr, pps->id, 0, GST_H264_MAX_PPS_COUNT - 1); |
| READ_UE_ALLOWED (&nr, sps_id, 0, GST_H264_MAX_SPS_COUNT - 1); |
| |
| sps = gst_h264_parser_get_sps (nalparser, sps_id); |
| if (!sps) { |
| GST_WARNING ("couldn't find associated sequence parameter set with id: %d", |
| sps_id); |
| return GST_H264_PARSER_BROKEN_LINK; |
| } |
| pps->sequence = sps; |
| qp_bd_offset = 6 * (sps->bit_depth_luma_minus8 + |
| sps->separate_colour_plane_flag); |
| |
| /* set default values for fields that might not be present in the bitstream |
| and have valid defaults */ |
| pps->slice_group_id = NULL; |
| pps->transform_8x8_mode_flag = 0; |
| memcpy (&pps->scaling_lists_4x4, &sps->scaling_lists_4x4, 96); |
| memcpy (&pps->scaling_lists_8x8, &sps->scaling_lists_8x8, 384); |
| |
| READ_UINT8 (&nr, pps->entropy_coding_mode_flag, 1); |
| READ_UINT8 (&nr, pps->pic_order_present_flag, 1); |
| READ_UE_ALLOWED (&nr, pps->num_slice_groups_minus1, 0, 7); |
| if (pps->num_slice_groups_minus1 > 0) { |
| READ_UE_ALLOWED (&nr, pps->slice_group_map_type, 0, 6); |
| |
| if (pps->slice_group_map_type == 0) { |
| gint i; |
| |
| for (i = 0; i <= pps->num_slice_groups_minus1; i++) |
| READ_UE (&nr, pps->run_length_minus1[i]); |
| } else if (pps->slice_group_map_type == 2) { |
| gint i; |
| |
| for (i = 0; i < pps->num_slice_groups_minus1; i++) { |
| READ_UE (&nr, pps->top_left[i]); |
| READ_UE (&nr, pps->bottom_right[i]); |
| } |
| } else if (pps->slice_group_map_type >= 3 && pps->slice_group_map_type <= 5) { |
| READ_UINT8 (&nr, pps->slice_group_change_direction_flag, 1); |
| READ_UE (&nr, pps->slice_group_change_rate_minus1); |
| } else if (pps->slice_group_map_type == 6) { |
| gint bits; |
| gint i; |
| |
| READ_UE (&nr, pps->pic_size_in_map_units_minus1); |
| bits = g_bit_storage (pps->num_slice_groups_minus1); |
| |
| pps->slice_group_id = |
| g_new (guint8, pps->pic_size_in_map_units_minus1 + 1); |
| for (i = 0; i <= pps->pic_size_in_map_units_minus1; i++) |
| READ_UINT8 (&nr, pps->slice_group_id[i], bits); |
| } |
| } |
| |
| READ_UE_ALLOWED (&nr, pps->num_ref_idx_l0_active_minus1, 0, 31); |
| READ_UE_ALLOWED (&nr, pps->num_ref_idx_l1_active_minus1, 0, 31); |
| READ_UINT8 (&nr, pps->weighted_pred_flag, 1); |
| READ_UINT8 (&nr, pps->weighted_bipred_idc, 2); |
| READ_SE_ALLOWED (&nr, pps->pic_init_qp_minus26, -(26 + qp_bd_offset), 25); |
| READ_SE_ALLOWED (&nr, pps->pic_init_qs_minus26, -26, 25); |
| READ_SE_ALLOWED (&nr, pps->chroma_qp_index_offset, -12, 12); |
| pps->second_chroma_qp_index_offset = pps->chroma_qp_index_offset; |
| READ_UINT8 (&nr, pps->deblocking_filter_control_present_flag, 1); |
| READ_UINT8 (&nr, pps->constrained_intra_pred_flag, 1); |
| READ_UINT8 (&nr, pps->redundant_pic_cnt_present_flag, 1); |
| |
| if (!nal_reader_has_more_data (&nr)) |
| goto done; |
| |
| READ_UINT8 (&nr, pps->transform_8x8_mode_flag, 1); |
| |
| READ_UINT8 (&nr, pic_scaling_matrix_present_flag, 1); |
| if (pic_scaling_matrix_present_flag) { |
| guint8 n_lists; |
| |
| n_lists = 6 + ((sps->chroma_format_idc != 3) ? 2 : 6) * |
| pps->transform_8x8_mode_flag; |
| |
| if (sps->scaling_matrix_present_flag) { |
| if (!gst_h264_parser_parse_scaling_list (&nr, |
| pps->scaling_lists_4x4, pps->scaling_lists_8x8, |
| sps->scaling_lists_4x4[3], sps->scaling_lists_4x4[0], |
| sps->scaling_lists_8x8[3], sps->scaling_lists_8x8[0], n_lists)) |
| goto error; |
| } else { |
| if (!gst_h264_parser_parse_scaling_list (&nr, |
| pps->scaling_lists_4x4, pps->scaling_lists_8x8, |
| default_4x4_inter, default_4x4_intra, |
| default_8x8_inter, default_8x8_intra, n_lists)) |
| goto error; |
| } |
| } |
| |
| READ_SE_ALLOWED (&nr, pps->second_chroma_qp_index_offset, -12, 12); |
| |
| done: |
| pps->valid = TRUE; |
| return GST_H264_PARSER_OK; |
| |
| error: |
| GST_WARNING ("error parsing \"Picture parameter set\""); |
| pps->valid = FALSE; |
| return GST_H264_PARSER_ERROR; |
| } |
| |
| /** |
| * gst_h264_parser_parse_pps: |
| * @nalparser: a #GstH264NalParser |
| * @nalu: The #GST_H264_NAL_PPS #GstH264NalUnit to parse |
| * @pps: The #GstH264PPS to fill. |
| * |
| * Parses @data, and fills the @pps structure. |
| * |
| * Returns: a #GstH264ParserResult |
| */ |
| GstH264ParserResult |
| gst_h264_parser_parse_pps (GstH264NalParser * nalparser, |
| GstH264NalUnit * nalu, GstH264PPS * pps) |
| { |
| GstH264ParserResult res = gst_h264_parse_pps (nalparser, nalu, pps); |
| |
| if (res == GST_H264_PARSER_OK) { |
| GST_DEBUG ("adding picture parameter set with id: %d to array", pps->id); |
| |
| nalparser->pps[pps->id] = *pps; |
| nalparser->last_pps = &nalparser->pps[pps->id]; |
| } |
| |
| return res; |
| } |
| |
| /** |
| * gst_h264_parser_parse_slice_hdr: |
| * @nalparser: a #GstH264NalParser |
| * @nalu: The #GST_H264_NAL_SLICE #GstH264NalUnit to parse |
| * @slice: The #GstH264SliceHdr to fill. |
| * @parse_pred_weight_table: Whether to parse the pred_weight_table or not |
| * @parse_dec_ref_pic_marking: Whether to parse the dec_ref_pic_marking or not |
| * |
| * Parses @data, and fills the @slice structure. |
| * |
| * Returns: a #GstH264ParserResult |
| */ |
| GstH264ParserResult |
| gst_h264_parser_parse_slice_hdr (GstH264NalParser * nalparser, |
| GstH264NalUnit * nalu, GstH264SliceHdr * slice, |
| gboolean parse_pred_weight_table, gboolean parse_dec_ref_pic_marking) |
| { |
| NalReader nr; |
| gint pps_id; |
| GstH264PPS *pps; |
| GstH264SPS *sps; |
| |
| if (!nalu->size) { |
| GST_DEBUG ("Invalid Nal Unit"); |
| return GST_H264_PARSER_ERROR; |
| } |
| |
| |
| nal_reader_init (&nr, nalu->data + nalu->offset + 1, nalu->size - 1); |
| |
| READ_UE (&nr, slice->first_mb_in_slice); |
| READ_UE (&nr, slice->type); |
| |
| GST_DEBUG ("parsing \"Slice header\", slice type %u", slice->type); |
| |
| READ_UE_ALLOWED (&nr, pps_id, 0, GST_H264_MAX_PPS_COUNT - 1); |
| pps = gst_h264_parser_get_pps (nalparser, pps_id); |
| |
| if (!pps) { |
| GST_WARNING ("couldn't find associated picture parameter set with id: %d", |
| pps_id); |
| |
| return GST_H264_PARSER_BROKEN_LINK; |
| } |
| |
| slice->pps = pps; |
| sps = pps->sequence; |
| if (!sps) { |
| GST_WARNING ("couldn't find associated sequence parameter set with id: %d", |
| pps->id); |
| return GST_H264_PARSER_BROKEN_LINK; |
| } |
| |
| /* set default values for fields that might not be present in the bitstream |
| and have valid defaults */ |
| slice->field_pic_flag = 0; |
| slice->bottom_field_flag = 0; |
| slice->delta_pic_order_cnt_bottom = 0; |
| slice->delta_pic_order_cnt[0] = 0; |
| slice->delta_pic_order_cnt[1] = 0; |
| slice->redundant_pic_cnt = 0; |
| slice->num_ref_idx_l0_active_minus1 = pps->num_ref_idx_l0_active_minus1; |
| slice->num_ref_idx_l1_active_minus1 = pps->num_ref_idx_l1_active_minus1; |
| slice->disable_deblocking_filter_idc = 0; |
| slice->slice_alpha_c0_offset_div2 = 0; |
| slice->slice_beta_offset_div2 = 0; |
| |
| if (sps->separate_colour_plane_flag) |
| READ_UINT8 (&nr, slice->colour_plane_id, 2); |
| |
| READ_UINT16 (&nr, slice->frame_num, sps->log2_max_frame_num_minus4 + 4); |
| |
| if (!sps->frame_mbs_only_flag) { |
| READ_UINT8 (&nr, slice->field_pic_flag, 1); |
| if (slice->field_pic_flag) |
| READ_UINT8 (&nr, slice->bottom_field_flag, 1); |
| } |
| |
| /* calculate MaxPicNum */ |
| if (slice->field_pic_flag) |
| slice->max_pic_num = sps->max_frame_num; |
| else |
| slice->max_pic_num = 2 * sps->max_frame_num; |
| |
| if (nalu->idr_pic_flag) |
| READ_UE_ALLOWED (&nr, slice->idr_pic_id, 0, G_MAXUINT16); |
| |
| if (sps->pic_order_cnt_type == 0) { |
| READ_UINT16 (&nr, slice->pic_order_cnt_lsb, |
| sps->log2_max_pic_order_cnt_lsb_minus4 + 4); |
| |
| if (pps->pic_order_present_flag && !slice->field_pic_flag) |
| READ_SE (&nr, slice->delta_pic_order_cnt_bottom); |
| } |
| |
| if (sps->pic_order_cnt_type == 1 && !sps->delta_pic_order_always_zero_flag) { |
| READ_SE (&nr, slice->delta_pic_order_cnt[0]); |
| if (pps->pic_order_present_flag && !slice->field_pic_flag) |
| READ_SE (&nr, slice->delta_pic_order_cnt[1]); |
| } |
| |
| if (pps->redundant_pic_cnt_present_flag) |
| READ_UE_ALLOWED (&nr, slice->redundant_pic_cnt, 0, G_MAXINT8); |
| |
| if (GST_H264_IS_B_SLICE (slice)) |
| READ_UINT8 (&nr, slice->direct_spatial_mv_pred_flag, 1); |
| |
| if (GST_H264_IS_P_SLICE (slice) || GST_H264_IS_SP_SLICE (slice) || |
| GST_H264_IS_B_SLICE (slice)) { |
| guint8 num_ref_idx_active_override_flag; |
| |
| READ_UINT8 (&nr, num_ref_idx_active_override_flag, 1); |
| if (num_ref_idx_active_override_flag) { |
| READ_UE_ALLOWED (&nr, slice->num_ref_idx_l0_active_minus1, 0, 31); |
| |
| if (GST_H264_IS_B_SLICE (slice)) |
| READ_UE_ALLOWED (&nr, slice->num_ref_idx_l1_active_minus1, 0, 31); |
| } |
| } |
| |
| if (!slice_parse_ref_pic_list_modification (slice, &nr)) |
| goto error; |
| |
| if ((pps->weighted_pred_flag && (GST_H264_IS_P_SLICE (slice) |
| || GST_H264_IS_SP_SLICE (slice))) |
| || (pps->weighted_bipred_idc == 1 && GST_H264_IS_B_SLICE (slice))) { |
| if (!gst_h264_slice_parse_pred_weight_table (slice, &nr, |
| sps->chroma_array_type)) |
| goto error; |
| } |
| |
| if (nalu->ref_idc != 0) { |
| if (!gst_h264_slice_parse_dec_ref_pic_marking (slice, nalu, &nr)) |
| goto error; |
| } |
| |
| if (pps->entropy_coding_mode_flag && !GST_H264_IS_I_SLICE (slice) && |
| !GST_H264_IS_SI_SLICE (slice)) |
| READ_UE_ALLOWED (&nr, slice->cabac_init_idc, 0, 2); |
| |
| READ_SE_ALLOWED (&nr, slice->slice_qp_delta, -87, 77); |
| |
| if (GST_H264_IS_SP_SLICE (slice) || GST_H264_IS_SI_SLICE (slice)) { |
| guint8 sp_for_switch_flag; |
| |
| if (GST_H264_IS_SP_SLICE (slice)) |
| READ_UINT8 (&nr, sp_for_switch_flag, 1); |
| READ_SE_ALLOWED (&nr, slice->slice_qs_delta, -51, 51); |
| } |
| |
| if (pps->deblocking_filter_control_present_flag) { |
| READ_UE_ALLOWED (&nr, slice->disable_deblocking_filter_idc, 0, 2); |
| if (slice->disable_deblocking_filter_idc != 1) { |
| READ_SE_ALLOWED (&nr, slice->slice_alpha_c0_offset_div2, -6, 6); |
| READ_SE_ALLOWED (&nr, slice->slice_beta_offset_div2, -6, 6); |
| } |
| } |
| |
| if (pps->num_slice_groups_minus1 > 0 && |
| pps->slice_group_map_type >= 3 && pps->slice_group_map_type <= 5) { |
| /* Ceil(Log2(PicSizeInMapUnits / SliceGroupChangeRate + 1)) [7-33] */ |
| guint32 PicWidthInMbs = sps->pic_width_in_mbs_minus1 + 1; |
| guint32 PicHeightInMapUnits = sps->pic_height_in_map_units_minus1 + 1; |
| guint32 PicSizeInMapUnits = PicWidthInMbs * PicHeightInMapUnits; |
| guint32 SliceGroupChangeRate = pps->slice_group_change_rate_minus1 + 1; |
| const guint n = ceil_log2 (PicSizeInMapUnits / SliceGroupChangeRate + 1); |
| READ_UINT16 (&nr, slice->slice_group_change_cycle, n); |
| } |
| |
| slice->header_size = nal_reader_get_pos (&nr); |
| slice->n_emulation_prevention_bytes = nal_reader_get_epb_count (&nr); |
| |
| return GST_H264_PARSER_OK; |
| |
| error: |
| GST_WARNING ("error parsing \"Slice header\""); |
| return GST_H264_PARSER_ERROR; |
| } |
| |
| /** |
| * gst_h264_parser_parse_sei: |
| * @nalparser: a #GstH264NalParser |
| * @nalu: The #GST_H264_NAL_SEI #GstH264NalUnit to parse |
| * @messages: The GArray of #GstH264SEIMessage to fill. The caller must free it when done. |
| * |
| * Parses @data, create and fills the @messages array. |
| * |
| * Returns: a #GstH264ParserResult |
| */ |
| GstH264ParserResult |
| gst_h264_parser_parse_sei (GstH264NalParser * nalparser, GstH264NalUnit * nalu, |
| GArray ** messages) |
| { |
| NalReader nr; |
| GstH264SEIMessage sei; |
| GstH264ParserResult res; |
| |
| GST_DEBUG ("parsing SEI nal"); |
| nal_reader_init (&nr, nalu->data + nalu->offset + 1, nalu->size - 1); |
| *messages = g_array_new (FALSE, FALSE, sizeof (GstH264SEIMessage)); |
| |
| do { |
| res = gst_h264_parser_parse_sei_message (nalparser, &nr, &sei); |
| if (res == GST_H264_PARSER_OK) |
| g_array_append_val (*messages, sei); |
| else |
| break; |
| } while (nal_reader_has_more_data (&nr)); |
| |
| return res; |
| } |
| |
| /** |
| * gst_h264_quant_matrix_8x8_get_zigzag_from_raster: |
| * @out_quant: (out): The resulting quantization matrix |
| * @quant: The source quantization matrix |
| * |
| * Converts quantization matrix @quant from raster scan order to |
| * zigzag scan order and store the resulting factors into @out_quant. |
| * |
| * Note: it is an error to pass the same table in both @quant and |
| * @out_quant arguments. |
| * |
| * Since: 1.4 |
| */ |
| void |
| gst_h264_quant_matrix_8x8_get_zigzag_from_raster (guint8 out_quant[64], |
| const guint8 quant[64]) |
| { |
| guint i; |
| |
| g_return_if_fail (out_quant != quant); |
| |
| for (i = 0; i < 64; i++) |
| out_quant[i] = quant[zigzag_8x8[i]]; |
| } |
| |
| /** |
| * gst_h264_quant_matrix_8x8_get_raster_from_zigzag: |
| * @out_quant: (out): The resulting quantization matrix |
| * @quant: The source quantization matrix |
| * |
| * Converts quantization matrix @quant from zigzag scan order to |
| * raster scan order and store the resulting factors into @out_quant. |
| * |
| * Note: it is an error to pass the same table in both @quant and |
| * @out_quant arguments. |
| * |
| * Since: 1.4 |
| */ |
| void |
| gst_h264_quant_matrix_8x8_get_raster_from_zigzag (guint8 out_quant[64], |
| const guint8 quant[64]) |
| { |
| guint i; |
| |
| g_return_if_fail (out_quant != quant); |
| |
| for (i = 0; i < 64; i++) |
| out_quant[zigzag_8x8[i]] = quant[i]; |
| } |
| |
| /** |
| * gst_h264_quant_matrix_4x4_get_zigzag_from_raster: |
| * @out_quant: (out): The resulting quantization matrix |
| * @quant: The source quantization matrix |
| * |
| * Converts quantization matrix @quant from raster scan order to |
| * zigzag scan order and store the resulting factors into @out_quant. |
| * |
| * Note: it is an error to pass the same table in both @quant and |
| * @out_quant arguments. |
| * |
| * Since: 1.4 |
| */ |
| void |
| gst_h264_quant_matrix_4x4_get_zigzag_from_raster (guint8 out_quant[16], |
| const guint8 quant[16]) |
| { |
| guint i; |
| |
| g_return_if_fail (out_quant != quant); |
| |
| for (i = 0; i < 16; i++) |
| out_quant[i] = quant[zigzag_4x4[i]]; |
| } |
| |
| /** |
| * gst_h264_quant_matrix_4x4_get_raster_from_zigzag: |
| * @out_quant: (out): The resulting quantization matrix |
| * @quant: The source quantization matrix |
| * |
| * Converts quantization matrix @quant from zigzag scan order to |
| * raster scan order and store the resulting factors into @out_quant. |
| * |
| * Note: it is an error to pass the same table in both @quant and |
| * @out_quant arguments. |
| * |
| * Since: 1.4 |
| */ |
| void |
| gst_h264_quant_matrix_4x4_get_raster_from_zigzag (guint8 out_quant[16], |
| const guint8 quant[16]) |
| { |
| guint i; |
| |
| g_return_if_fail (out_quant != quant); |
| |
| for (i = 0; i < 16; i++) |
| out_quant[zigzag_4x4[i]] = quant[i]; |
| } |
| |
| /** |
| * gst_h264_video_calculate_framerate: |
| * @sps: Current Sequence Parameter Set |
| * @field_pic_flag: Current @field_pic_flag, obtained from latest slice header |
| * @pic_struct: @pic_struct value if available, 0 otherwise |
| * @fps_num: (out): The resulting fps numerator |
| * @fps_den: (out): The resulting fps denominator |
| * |
| * Calculate framerate of a video sequence using @sps VUI information, |
| * @field_pic_flag from a slice header and @pic_struct from #GstH264PicTiming SEI |
| * message. |
| * |
| * If framerate is variable or can't be determined, @fps_num will be set to 0 |
| * and @fps_den to 1. |
| */ |
| void |
| gst_h264_video_calculate_framerate (const GstH264SPS * sps, |
| guint field_pic_flag, guint pic_struct, gint * fps_num, gint * fps_den) |
| { |
| gint num = 0; |
| gint den = 1; |
| |
| /* To calculate framerate, we use this formula: |
| * time_scale 1 1 |
| * fps = ----------------- x --------------- x ------------------------ |
| * num_units_in_tick DeltaTfiDivisor (field_pic_flag ? 2 : 1) |
| * |
| * See H264 specification E2.1 for more details. |
| */ |
| |
| if (sps) { |
| if (sps->vui_parameters_present_flag) { |
| const GstH264VUIParams *vui = &sps->vui_parameters; |
| if (vui->timing_info_present_flag && vui->fixed_frame_rate_flag) { |
| int delta_tfi_divisor = 1; |
| num = vui->time_scale; |
| den = vui->num_units_in_tick; |
| |
| if (vui->pic_struct_present_flag) { |
| switch (pic_struct) { |
| case 1: |
| case 2: |
| delta_tfi_divisor = 1; |
| break; |
| case 0: |
| case 3: |
| case 4: |
| delta_tfi_divisor = 2; |
| break; |
| case 5: |
| case 6: |
| delta_tfi_divisor = 3; |
| break; |
| case 7: |
| delta_tfi_divisor = 4; |
| break; |
| case 8: |
| delta_tfi_divisor = 6; |
| break; |
| } |
| } else { |
| delta_tfi_divisor = field_pic_flag ? 1 : 2; |
| } |
| den *= delta_tfi_divisor; |
| |
| /* Picture is two fields ? */ |
| den *= (field_pic_flag ? 2 : 1); |
| } |
| } |
| } |
| |
| *fps_num = num; |
| *fps_den = den; |
| } |