mirrors/gstreamer
mirrors/gstreamer
1
1
Fork 0
mirror of https://gitlab.freedesktop.org/gstreamer/gstreamer.git synced 2024-12-20 23:36:38 +00:00
Code Issues 1 Projects Releases Wiki Activity
gstreamer/gst-libs/gst/codecparsers/gsth264parser.c
Víctor Manuel Jáquez Leal d054a6918c codecparser: h264: initialize parsing structures 
Initialize to 0 these parse structures before filling them: GstH264SEIMessage,
GstH264NalUnit, GstH264PPS, GstH264SPS and GstH264SliceHdr.

When calling the functions which fill those structures, they may fail, leaving
unitialized those structures. This situation may lead to future problems, such
as a segmentation fault when freeing, for example.

This patch initializes to zero these structures, before filling them.

https://bugzilla.gnome.org/show_bug.cgi?id=755161
2015-10-29 11:26:37 +02:00

2508 lines
75 KiB
C
Raw Blame History

This file contains ambiguous Unicode characters

This file contains Unicode characters that might be confused with other characters. If you think that this is intentional, you can safely ignore this warning. Use the Escape button to reveal them.

/* 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 const 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;
guint8 svc_extension_flag;
GstBitReader br;
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);
nalu->header_bytes = 1;
nalu->extension_type = GST_H264_NAL_EXTENSION_NONE;
switch (nalu->type) {
case GST_H264_NAL_PREFIX_UNIT:
case GST_H264_NAL_SLICE_EXT:
if (nalu->size < 4)
return FALSE;
gst_bit_reader_init (&br, nalu->data + nalu->offset + nalu->header_bytes,
nalu->size - nalu->header_bytes);
svc_extension_flag = gst_bit_reader_get_bits_uint8_unchecked (&br, 1);
if (svc_extension_flag) { /* SVC */
nalu->extension_type = GST_H264_NAL_EXTENSION_SVC;
} else { /* MVC */
GstH264NalUnitExtensionMVC *const mvc = &nalu->extension.mvc;
nalu->extension_type = GST_H264_NAL_EXTENSION_MVC;
mvc->non_idr_flag = gst_bit_reader_get_bits_uint8_unchecked (&br, 1);
mvc->priority_id = gst_bit_reader_get_bits_uint8_unchecked (&br, 6);
mvc->view_id = gst_bit_reader_get_bits_uint16_unchecked (&br, 10);
mvc->temporal_id = gst_bit_reader_get_bits_uint8_unchecked (&br, 3);
mvc->anchor_pic_flag = gst_bit_reader_get_bits_uint8_unchecked (&br, 1);
mvc->inter_view_flag = gst_bit_reader_get_bits_uint8_unchecked (&br, 1);
/* Update IdrPicFlag (H.7.4.1.1) */
nalu->idr_pic_flag = !mvc->non_idr_flag;
}
nalu->header_bytes += 3;
break;
default:
break;
}
GST_DEBUG ("Nal type %u, ref_idc %u", nalu->type, nalu->ref_idc);
return TRUE;
}
/*
* gst_h264_pps_copy:
* @dst_pps: The destination #GstH264PPS to copy into
* @src_pps: The source #GstH264PPS to copy from
*
* Copies @src_pps into @dst_pps.
*
* Returns: %TRUE if everything went fine, %FALSE otherwise
*/
static gboolean
gst_h264_pps_copy (GstH264PPS * dst_pps, const GstH264PPS * src_pps)
{
g_return_val_if_fail (dst_pps != NULL, FALSE);
g_return_val_if_fail (src_pps != NULL, FALSE);
gst_h264_pps_clear (dst_pps);
*dst_pps = *src_pps;
if (src_pps->slice_group_id)
dst_pps->slice_group_id = g_memdup (src_pps->slice_group_id,
src_pps->pic_size_in_map_units_minus1 + 1);
return TRUE;
}
/* Copy MVC-specific data for subset SPS header */
static gboolean
gst_h264_sps_mvc_copy (GstH264SPS * dst_sps, const GstH264SPS * src_sps)
{
GstH264SPSExtMVC *const dst_mvc = &dst_sps->extension.mvc;
const GstH264SPSExtMVC *const src_mvc = &src_sps->extension.mvc;
guint i, j, k;
g_assert (dst_sps->extension_type == GST_H264_NAL_EXTENSION_MVC);
dst_mvc->num_views_minus1 = src_mvc->num_views_minus1;
dst_mvc->view = g_new0 (GstH264SPSExtMVCView, dst_mvc->num_views_minus1 + 1);
if (!dst_mvc->view)
return FALSE;
dst_mvc->view[0].view_id = src_mvc->view[0].view_id;
for (i = 1; i <= dst_mvc->num_views_minus1; i++) {
GstH264SPSExtMVCView *const dst_view = &dst_mvc->view[i];
const GstH264SPSExtMVCView *const src_view = &src_mvc->view[i];
dst_view->view_id = src_view->view_id;
dst_view->num_anchor_refs_l0 = src_view->num_anchor_refs_l0;
for (j = 0; j < dst_view->num_anchor_refs_l0; j++)
dst_view->anchor_ref_l0[j] = src_view->anchor_ref_l0[j];
dst_view->num_anchor_refs_l1 = src_view->num_anchor_refs_l1;
for (j = 0; j < dst_view->num_anchor_refs_l1; j++)
dst_view->anchor_ref_l1[j] = src_view->anchor_ref_l1[j];
dst_view->num_non_anchor_refs_l0 = src_view->num_non_anchor_refs_l0;
for (j = 0; j < dst_view->num_non_anchor_refs_l0; j++)
dst_view->non_anchor_ref_l0[j] = src_view->non_anchor_ref_l0[j];
dst_view->num_non_anchor_refs_l1 = src_view->num_non_anchor_refs_l1;
for (j = 0; j < dst_view->num_non_anchor_refs_l1; j++)
dst_view->non_anchor_ref_l1[j] = src_view->non_anchor_ref_l1[j];
}
dst_mvc->num_level_values_signalled_minus1 =
src_mvc->num_level_values_signalled_minus1;
dst_mvc->level_value = g_new0 (GstH264SPSExtMVCLevelValue,
dst_mvc->num_level_values_signalled_minus1 + 1);
if (!dst_mvc->level_value)
return FALSE;
for (i = 0; i <= dst_mvc->num_level_values_signalled_minus1; i++) {
GstH264SPSExtMVCLevelValue *const dst_value = &dst_mvc->level_value[i];
const GstH264SPSExtMVCLevelValue *const src_value =
&src_mvc->level_value[i];
dst_value->level_idc = src_value->level_idc;
dst_value->num_applicable_ops_minus1 = src_value->num_applicable_ops_minus1;
dst_value->applicable_op = g_new0 (GstH264SPSExtMVCLevelValueOp,
dst_value->num_applicable_ops_minus1 + 1);
if (!dst_value->applicable_op)
return FALSE;
for (j = 0; j <= dst_value->num_applicable_ops_minus1; j++) {
GstH264SPSExtMVCLevelValueOp *const dst_op = &dst_value->applicable_op[j];
const GstH264SPSExtMVCLevelValueOp *const src_op =
&src_value->applicable_op[j];
dst_op->temporal_id = src_op->temporal_id;
dst_op->num_target_views_minus1 = src_op->num_target_views_minus1;
dst_op->target_view_id =
g_new (guint16, dst_op->num_target_views_minus1 + 1);
if (!dst_op->target_view_id)
return FALSE;
for (k = 0; k <= dst_op->num_target_views_minus1; k++)
dst_op->target_view_id[k] = src_op->target_view_id[k];
dst_op->num_views_minus1 = src_op->num_views_minus1;
}
}
return TRUE;
}
/*
* gst_h264_sps_copy:
* @dst_sps: The destination #GstH264SPS to copy into
* @src_sps: The source #GstH264SPS to copy from
*
* Copies @src_sps into @dst_sps.
*
* Returns: %TRUE if everything went fine, %FALSE otherwise
*/
static gboolean
gst_h264_sps_copy (GstH264SPS * dst_sps, const GstH264SPS * src_sps)
{
g_return_val_if_fail (dst_sps != NULL, FALSE);
g_return_val_if_fail (src_sps != NULL, FALSE);
gst_h264_sps_clear (dst_sps);
*dst_sps = *src_sps;
switch (dst_sps->extension_type) {
case GST_H264_NAL_EXTENSION_MVC:
if (!gst_h264_sps_mvc_copy (dst_sps, src_sps))
return FALSE;
break;
}
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_MAX (nr, hrd->cpb_cnt_minus1, 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->video_format = 5;
vui->colour_primaries = 2;
vui->transfer_characteristics = 2;
vui->matrix_coefficients = 2;
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_MAX (nr, vui->chroma_sample_loc_type_top_field, 5);
READ_UE_MAX (nr, vui->chroma_sample_loc_type_bottom_field, 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_MAX (nr, vui->max_bits_per_mb_denom, 16);
READ_UE_MAX (nr, vui->log2_max_mv_length_horizontal, 16);
READ_UE_MAX (nr, vui->log2_max_mv_length_vertical, 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, gboolean is_mvc)
{
GstH264RefPicListModification *entries;
guint8 *ref_pic_list_modification_flag, *n_ref_pic_list_modification;
guint32 modification_of_pic_nums_idc;
gsize max_entries;
guint i = 0;
if (list == 0) {
entries = slice->ref_pic_list_modification_l0;
max_entries = G_N_ELEMENTS (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;
max_entries = G_N_ELEMENTS (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 == 0 ||
modification_of_pic_nums_idc == 1) {
READ_UE_MAX (nr, entries[i].value.abs_diff_pic_num_minus1,
slice->max_pic_num - 1);
} else if (modification_of_pic_nums_idc == 2) {
READ_UE (nr, entries[i].value.long_term_pic_num);
} else if (is_mvc && (modification_of_pic_nums_idc == 4 ||
modification_of_pic_nums_idc == 5)) {
READ_UE (nr, entries[i].value.abs_diff_view_idx_minus1);
}
entries[i++].modification_of_pic_nums_idc = modification_of_pic_nums_idc;
if (modification_of_pic_nums_idc == 3)
break;
if (i >= max_entries)
goto error;
}
}
*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,
gboolean is_mvc)
{
if (!GST_H264_IS_I_SLICE (slice) && !GST_H264_IS_SI_SLICE (slice)) {
if (!slice_parse_ref_pic_list_modification_1 (slice, nr, 0, is_mvc))
return FALSE;
}
if (GST_H264_IS_B_SLICE (slice)) {
if (!slice_parse_ref_pic_list_modification_1 (slice, nr, 1, is_mvc))
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_MAX (nr, p->luma_log2_weight_denom, 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;
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;
}
if (chroma_array_type != 0) {
READ_UE_MAX (nr, p->chroma_log2_weight_denom, 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;
}
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;
}
}
}
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_MAX (nr, sps_id, 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_UINT32 (nr, per->nal_initial_cpb_removal_delay[sched_sel_idx],
nbits);
READ_UINT32 (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_UINT32 (nr, per->vcl_initial_cpb_removal_delay[sched_sel_idx],
nbits);
READ_UINT32 (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;
}
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_recovery_point (GstH264NalParser * nalparser,
GstH264RecoveryPoint * rp, NalReader * nr)
{
GstH264SPS *const sps = nalparser->last_sps;
GST_DEBUG ("parsing \"Recovery point\"");
if (!sps || !sps->valid) {
GST_WARNING ("didn't get the associated sequence paramater set for the "
"current access unit");
goto error;
}
READ_UE_MAX (nr, rp->recovery_frame_cnt, sps->max_frame_num - 1);
READ_UINT8 (nr, rp->exact_match_flag, 1);
READ_UINT8 (nr, rp->broken_link_flag, 1);
READ_UINT8 (nr, rp->changing_slice_group_idc, 2);
return GST_H264_PARSER_OK;
error:
GST_WARNING ("error parsing \"Recovery point\"");
return GST_H264_PARSER_ERROR;
}
/* Parse SEI stereo_video_info() message */
static GstH264ParserResult
gst_h264_parser_parse_stereo_video_info (GstH264NalParser * nalparser,
GstH264StereoVideoInfo * info, NalReader * nr)
{
GST_DEBUG ("parsing \"Stereo Video info\"");
READ_UINT8 (nr, info->field_views_flag, 1);
if (info->field_views_flag) {
READ_UINT8 (nr, info->top_field_is_left_view_flag, 1);
} else {
READ_UINT8 (nr, info->current_frame_is_left_view_flag, 1);
READ_UINT8 (nr, info->next_frame_is_second_view_flag, 1);
}
READ_UINT8 (nr, info->left_view_self_contained_flag, 1);
READ_UINT8 (nr, info->right_view_self_contained_flag, 1);
return GST_H264_PARSER_OK;
error:
GST_WARNING ("error parsing \"Stereo Video info\"");
return GST_H264_PARSER_ERROR;
}
/* Parse SEI frame_packing_arrangement() message */
static GstH264ParserResult
gst_h264_parser_parse_frame_packing (GstH264NalParser * nalparser,
GstH264FramePacking * frame_packing, NalReader * nr, guint payload_size)
{
guint8 frame_packing_extension_flag;
guint start_pos;
GST_DEBUG ("parsing \"Frame Packing Arrangement\"");
start_pos = nal_reader_get_pos (nr);
READ_UE (nr, frame_packing->frame_packing_id);
READ_UINT8 (nr, frame_packing->frame_packing_cancel_flag, 1);
if (!frame_packing->frame_packing_cancel_flag) {
READ_UINT8 (nr, frame_packing->frame_packing_type, 7);
READ_UINT8 (nr, frame_packing->quincunx_sampling_flag, 1);
READ_UINT8 (nr, frame_packing->content_interpretation_type, 6);
READ_UINT8 (nr, frame_packing->spatial_flipping_flag, 1);
READ_UINT8 (nr, frame_packing->frame0_flipped_flag, 1);
READ_UINT8 (nr, frame_packing->field_views_flag, 1);
READ_UINT8 (nr, frame_packing->current_frame_is_frame0_flag, 1);
READ_UINT8 (nr, frame_packing->frame0_self_contained_flag, 1);
READ_UINT8 (nr, frame_packing->frame1_self_contained_flag, 1);
if (!frame_packing->quincunx_sampling_flag &&
frame_packing->frame_packing_type !=
GST_H264_FRAME_PACKING_TEMPORAL_INTERLEAVING) {
READ_UINT8 (nr, frame_packing->frame0_grid_position_x, 4);
READ_UINT8 (nr, frame_packing->frame0_grid_position_y, 4);
READ_UINT8 (nr, frame_packing->frame1_grid_position_x, 4);
READ_UINT8 (nr, frame_packing->frame1_grid_position_y, 4);
}
/* Skip frame_packing_arrangement_reserved_byte */
if (!nal_reader_skip (nr, 8))
goto error;
READ_UE_MAX (nr, frame_packing->frame_packing_repetition_period, 16384);
}
READ_UINT8 (nr, frame_packing_extension_flag, 1);
/* All data that follows within a frame packing arrangement SEI message
after the value 1 for frame_packing_arrangement_extension_flag shall
be ignored (D.2.25) */
if (frame_packing_extension_flag) {
nal_reader_skip_long (nr,
payload_size - (nal_reader_get_pos (nr) - start_pos));
}
return GST_H264_PARSER_OK;
error:
GST_WARNING ("error parsing \"Frame Packing Arrangement\"");
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\"");
memset (sei, 0, sizeof (*sei));
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;
case GST_H264_SEI_RECOVERY_POINT:
res = gst_h264_parser_parse_recovery_point (nalparser,
&sei->payload.recovery_point, nr);
break;
case GST_H264_SEI_STEREO_VIDEO_INFO:
res = gst_h264_parser_parse_stereo_video_info (nalparser,
&sei->payload.stereo_video_info, nr);
break;
case GST_H264_SEI_FRAME_PACKING:
res = gst_h264_parser_parse_frame_packing (nalparser,
&sei->payload.frame_packing, nr, payload_size);
break;
default:
/* Just consume payloadSize bytes, which does not account for
emulation prevention bytes */
if (!nal_reader_skip_long (nr, payload_size))
goto error;
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)
{
guint i;
for (i = 0; i < GST_H264_MAX_SPS_COUNT; i++)
gst_h264_sps_clear (&nalparser->sps[i]);
for (i = 0; i < GST_H264_MAX_PPS_COUNT; i++)
gst_h264_pps_clear (&nalparser->pps[i]);
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;
memset (nalu, 0, sizeof (*nalu));
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 = 1;
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 == 1)
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;
memset (nalu, 0, sizeof (*nalu));
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);
if (!gst_h264_sps_copy (&nalparser->sps[sps->id], sps))
return GST_H264_PARSER_ERROR;
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;
memset (sps, 0, sizeof (*sps));
/* set default values for fields that might not be present in the bitstream
and have valid defaults */
sps->extension_type = GST_H264_NAL_EXTENSION_NONE;
sps->chroma_format_idc = 1;
memset (sps->scaling_lists_4x4, 16, 96);
memset (sps->scaling_lists_8x8, 16, 384);
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);
READ_UINT8 (nr, sps->constraint_set4_flag, 1);
READ_UINT8 (nr, sps->constraint_set5_flag, 1);
/* skip reserved_zero_2bits */
if (!nal_reader_skip (nr, 2))
goto error;
READ_UINT8 (nr, sps->level_idc, 8);
READ_UE_MAX (nr, sps->id, 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 || sps->profile_idc == 118 ||
sps->profile_idc == 128) {
READ_UE_MAX (nr, sps->chroma_format_idc, 3);
if (sps->chroma_format_idc == 3)
READ_UINT8 (nr, sps->separate_colour_plane_flag, 1);
READ_UE_MAX (nr, sps->bit_depth_luma_minus8, 6);
READ_UE_MAX (nr, sps->bit_depth_chroma_minus8, 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_MAX (nr, sps->log2_max_frame_num_minus4, 12);
sps->max_frame_num = 1 << (sps->log2_max_frame_num_minus4 + 4);
READ_UE_MAX (nr, sps->pic_order_cnt_type, 2);
if (sps->pic_order_cnt_type == 0) {
READ_UE_MAX (nr, sps->log2_max_pic_order_cnt_lsb_minus4, 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_MAX (nr, sps->num_ref_frames_in_pic_order_cnt_cycle, 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 = 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;
}
/* Parse subset_seq_parameter_set() data for MVC */
static gboolean
gst_h264_parse_sps_mvc_data (NalReader * nr, GstH264SPS * sps,
gboolean parse_vui_params)
{
GstH264SPSExtMVC *const mvc = &sps->extension.mvc;
guint8 bit_equal_to_one;
guint i, j, k;
READ_UINT8 (nr, bit_equal_to_one, 1);
if (!bit_equal_to_one)
return FALSE;
sps->extension_type = GST_H264_NAL_EXTENSION_MVC;
READ_UE_MAX (nr, mvc->num_views_minus1, GST_H264_MAX_VIEW_COUNT - 1);
mvc->view = g_new0 (GstH264SPSExtMVCView, mvc->num_views_minus1 + 1);
if (!mvc->view)
goto error_allocation_failed;
for (i = 0; i <= mvc->num_views_minus1; i++)
READ_UE_MAX (nr, mvc->view[i].view_id, GST_H264_MAX_VIEW_ID);
for (i = 1; i <= mvc->num_views_minus1; i++) {
/* for RefPicList0 */
READ_UE_MAX (nr, mvc->view[i].num_anchor_refs_l0, 15);
for (j = 0; j < mvc->view[i].num_anchor_refs_l0; j++) {
READ_UE_MAX (nr, mvc->view[i].anchor_ref_l0[j], GST_H264_MAX_VIEW_ID);
}
/* for RefPicList1 */
READ_UE_MAX (nr, mvc->view[i].num_anchor_refs_l1, 15);
for (j = 0; j < mvc->view[i].num_anchor_refs_l1; j++) {
READ_UE_MAX (nr, mvc->view[i].anchor_ref_l1[j], GST_H264_MAX_VIEW_ID);
}
}
for (i = 1; i <= mvc->num_views_minus1; i++) {
/* for RefPicList0 */
READ_UE_MAX (nr, mvc->view[i].num_non_anchor_refs_l0, 15);
for (j = 0; j < mvc->view[i].num_non_anchor_refs_l0; j++) {
READ_UE_MAX (nr, mvc->view[i].non_anchor_ref_l0[j], GST_H264_MAX_VIEW_ID);
}
/* for RefPicList1 */
READ_UE_MAX (nr, mvc->view[i].num_non_anchor_refs_l1, 15);
for (j = 0; j < mvc->view[i].num_non_anchor_refs_l1; j++) {
READ_UE_MAX (nr, mvc->view[i].non_anchor_ref_l1[j], GST_H264_MAX_VIEW_ID);
}
}
READ_UE_MAX (nr, mvc->num_level_values_signalled_minus1, 63);
mvc->level_value =
g_new0 (GstH264SPSExtMVCLevelValue,
mvc->num_level_values_signalled_minus1 + 1);
if (!mvc->level_value)
goto error_allocation_failed;
for (i = 0; i <= mvc->num_level_values_signalled_minus1; i++) {
GstH264SPSExtMVCLevelValue *const level_value = &mvc->level_value[i];
READ_UINT8 (nr, level_value->level_idc, 8);
READ_UE_MAX (nr, level_value->num_applicable_ops_minus1, 1023);
level_value->applicable_op =
g_new0 (GstH264SPSExtMVCLevelValueOp,
level_value->num_applicable_ops_minus1 + 1);
if (!level_value->applicable_op)
goto error_allocation_failed;
for (j = 0; j <= level_value->num_applicable_ops_minus1; j++) {
GstH264SPSExtMVCLevelValueOp *const op = &level_value->applicable_op[j];
READ_UINT8 (nr, op->temporal_id, 3);
READ_UE_MAX (nr, op->num_target_views_minus1, 1023);
op->target_view_id = g_new (guint16, op->num_target_views_minus1 + 1);
if (!op->target_view_id)
goto error_allocation_failed;
for (k = 0; k <= op->num_target_views_minus1; k++)
READ_UE_MAX (nr, op->target_view_id[k], GST_H264_MAX_VIEW_ID);
READ_UE_MAX (nr, op->num_views_minus1, 1023);
}
}
return TRUE;
error_allocation_failed:
GST_WARNING ("failed to allocate memory");
gst_h264_sps_clear (sps);
return FALSE;
error:
gst_h264_sps_clear (sps);
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 + nalu->header_bytes,
nalu->size - nalu->header_bytes);
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_parser_parse_subset_sps:
* @nalparser: a #GstH264NalParser
* @nalu: The #GST_H264_NAL_SUBSET_SPS #GstH264NalUnit to parse
* @sps: The #GstH264SPS to fill.
* @parse_vui_params: Whether to parse the vui_params or not
*
* Parses @data, and fills in the @sps structure.
*
* This function fully parses @data and allocates all the necessary
* data structures needed for MVC extensions. The resulting @sps
* structure shall be deallocated with gst_h264_sps_clear() when it is
* no longer needed.
*
* Note: if the caller doesn't need any of the MVC-specific data, then
* gst_h264_parser_parse_sps() is more efficient because those extra
* syntax elements are not parsed and no extra memory is allocated.
*
* Returns: a #GstH264ParserResult
*
* Since: 1.6
*/
GstH264ParserResult
gst_h264_parser_parse_subset_sps (GstH264NalParser * nalparser,
GstH264NalUnit * nalu, GstH264SPS * sps, gboolean parse_vui_params)
{
GstH264ParserResult res;
res = gst_h264_parse_subset_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);
if (!gst_h264_sps_copy (&nalparser->sps[sps->id], sps)) {
gst_h264_sps_clear (sps);
return GST_H264_PARSER_ERROR;
}
nalparser->last_sps = &nalparser->sps[sps->id];
}
return res;
}
/**
* gst_h264_parse_subset_sps:
* @nalu: The #GST_H264_NAL_SUBSET_SPS #GstH264NalUnit to parse
* @sps: The #GstH264SPS to fill.
* @parse_vui_params: Whether to parse the vui_params or not
*
* Parses @data, and fills in the @sps structure.
*
* This function fully parses @data and allocates all the necessary
* data structures needed for MVC extensions. The resulting @sps
* structure shall be deallocated with gst_h264_sps_clear() when it is
* no longer needed.
*
* Note: if the caller doesn't need any of the MVC-specific data, then
* gst_h264_parser_parse_sps() is more efficient because those extra
* syntax elements are not parsed and no extra memory is allocated.
*
* Returns: a #GstH264ParserResult
*
* Since: 1.6
*/
GstH264ParserResult
gst_h264_parse_subset_sps (GstH264NalUnit * nalu, GstH264SPS * sps,
gboolean parse_vui_params)
{
NalReader nr;
INITIALIZE_DEBUG_CATEGORY;
GST_DEBUG ("parsing Subset SPS");
nal_reader_init (&nr, nalu->data + nalu->offset + nalu->header_bytes,
nalu->size - nalu->header_bytes);
if (!gst_h264_parse_sps_data (&nr, sps, TRUE))
goto error;
if (sps->profile_idc == GST_H264_PROFILE_MULTIVIEW_HIGH ||
sps->profile_idc == GST_H264_PROFILE_STEREO_HIGH) {
if (!gst_h264_parse_sps_mvc_data (&nr, sps, parse_vui_params))
goto error;
}
sps->valid = TRUE;
return GST_H264_PARSER_OK;
error:
GST_WARNING ("error parsing \"Subset sequence parameter set\"");
gst_h264_sps_clear (sps);
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.
*
* The resulting @pps data structure shall be deallocated with the
* gst_h264_pps_clear() function when it is no longer needed, or prior
* to parsing a new PPS NAL unit.
*
* 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 + nalu->header_bytes,
nalu->size - nalu->header_bytes);
memset (pps, 0, sizeof (*pps));
READ_UE_MAX (&nr, pps->id, GST_H264_MAX_PPS_COUNT - 1);
READ_UE_MAX (&nr, sps_id, 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 */
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_MAX (&nr, pps->num_slice_groups_minus1, 7);
if (pps->num_slice_groups_minus1 > 0) {
READ_UE_MAX (&nr, pps->slice_group_map_type, 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_MAX (&nr, pps->num_ref_idx_l0_active_minus1, 31);
READ_UE_MAX (&nr, pps->num_ref_idx_l1_active_minus1, 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;
gst_h264_pps_clear (pps);
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.
*
* The resulting @pps data structure shall be deallocated with the
* gst_h264_pps_clear() function when it is no longer needed, or prior
* to parsing a new PPS NAL unit.
*
* 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);
if (!gst_h264_pps_copy (&nalparser->pps[pps->id], pps))
return GST_H264_PARSER_ERROR;
nalparser->last_pps = &nalparser->pps[pps->id];
}
return res;
}
/**
* gst_h264_pps_clear:
* @pps: The #GstH264PPS to free
*
* Clears all @pps internal resources.
*
* Since: 1.4
*/
void
gst_h264_pps_clear (GstH264PPS * pps)
{
g_return_if_fail (pps != NULL);
g_free (pps->slice_group_id);
pps->slice_group_id = NULL;
}
/**
* 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;
memset (slice, 0, sizeof (*slice));
if (!nalu->size) {
GST_DEBUG ("Invalid Nal Unit");
return GST_H264_PARSER_ERROR;
}
nal_reader_init (&nr, nalu->data + nalu->offset + nalu->header_bytes,
nalu->size - nalu->header_bytes);
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_MAX (&nr, pps_id, 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;
}
/* Check we can actually parse this slice (AVC, MVC headers only) */
if (sps->extension_type && sps->extension_type != GST_H264_NAL_EXTENSION_MVC) {
GST_WARNING ("failed to parse unsupported slice header");
return GST_H264_PARSER_BROKEN_DATA;
}
/* set default values for fields that might not be present in the bitstream
and have valid defaults */
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;
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 = 2 * sps->max_frame_num;
else
slice->max_pic_num = sps->max_frame_num;
if (nalu->idr_pic_flag)
READ_UE_MAX (&nr, slice->idr_pic_id, 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_MAX (&nr, slice->redundant_pic_cnt, 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_MAX (&nr, slice->num_ref_idx_l0_active_minus1, 31);
if (GST_H264_IS_B_SLICE (slice))
READ_UE_MAX (&nr, slice->num_ref_idx_l1_active_minus1, 31);
}
}
if (!slice_parse_ref_pic_list_modification (slice, &nr,
GST_H264_IS_MVC_NALU (nalu)))
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_MAX (&nr, slice->cabac_init_idc, 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_MAX (&nr, slice->disable_deblocking_filter_idc, 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;
}
/* Free MVC-specific data from subset SPS header */
static void
gst_h264_sps_mvc_clear (GstH264SPS * sps)
{
GstH264SPSExtMVC *const mvc = &sps->extension.mvc;
guint i, j;
g_assert (sps->extension_type == GST_H264_NAL_EXTENSION_MVC);
g_free (mvc->view);
mvc->view = NULL;
for (i = 0; i <= mvc->num_level_values_signalled_minus1; i++) {
GstH264SPSExtMVCLevelValue *const level_value = &mvc->level_value[i];
for (j = 0; j <= level_value->num_applicable_ops_minus1; j++) {
g_free (level_value->applicable_op[j].target_view_id);
level_value->applicable_op[j].target_view_id = NULL;
}
g_free (level_value->applicable_op);
level_value->applicable_op = NULL;
}
g_free (mvc->level_value);
mvc->level_value = NULL;
/* All meaningful MVC info are now gone, just pretend to be a
* standard AVC struct now */
sps->extension_type = GST_H264_NAL_EXTENSION_NONE;
}
/**
* gst_h264_sps_clear:
* @sps: The #GstH264SPS to free
*
* Clears all @sps internal resources.
*
* Since: 1.6
*/
void
gst_h264_sps_clear (GstH264SPS * sps)
{
g_return_if_fail (sps != NULL);
switch (sps->extension_type) {
case GST_H264_NAL_EXTENSION_MVC:
gst_h264_sps_mvc_clear (sps);
break;
}
}
/**
* 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 + nalu->header_bytes,
nalu->size - nalu->header_bytes);
*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;
}
Reference in a new issue View git blame Copy permalink