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[client] nal: added SLICE parser

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This commit is contained in:
Geoffrey McRae
2018-01-05 21:36:26 +11:00
parent d6f84ddd12
commit 5808089fce
2 changed files with 324 additions and 20 deletions
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281
client/parsers/nal.c
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@@ -50,6 +50,9 @@ struct NAL
uint32_t pps_slice_groups_size;
uint32_t * pps_slice_group_id;
uint32_t pps_slice_group_id_size;
bool slice_valid;
NAL_SLICE slice;
};
bool nal_initialize(NAL * ptr)
@@ -496,6 +499,68 @@ static bool parse_nal_pps(NAL this, const uint8_t * src, size_t size, size_t * c
pps->constrained_intra_pred_flag = get_bit(src, offset);
pps->redundant_pic_cnt_present_flag = get_bit(src, offset);
const bool extraData = get_bit(src, offset) == 0;
--*offset;
if (extraData)
{
pps->transform_8x8_mode_flag = get_bit(src, offset);
pps->pic_scaling_matrix_present_flag = get_bit(src, offset);
if (pps->pic_scaling_matrix_present_flag)
{
}
pps->second_chroma_qp_index_offset = decode_s_golomb(src, offset);
}
#ifdef DEBUG_NAL
DEBUG_INFO("PPS:\n"
"pic_parameter_set_id : %u\n"
"seq_parameter_set_id : %u\n"
"entropy_coding_mode_flag : %u\n"
"pic_order_present_flag : %u\n"
"num_slice_groups_minus1 : %u\n"
"slice_group_map_type : %u\n"
"slice_group_change_direction_flag : %u\n"
"slice_group_change_rate_minus1 : %u\n"
"pic_size_in_map_units_minus1 : %u\n"
"num_ref_idx_l0_active_minus1 : %u\n"
"num_ref_idx_l1_active_minus1 : %u\n"
"weighted_pred_flag : %u\n"
"weighted_bipred_idc : %u\n"
"pic_init_qp_minus26 : %d\n"
"pic_init_qs_minus26 : %d\n"
"chroma_qp_index_offset : %d\n"
"deblocking_filter_control_present_flag: %u\n"
"constrained_intra_pred_flag : %u\n"
"redundant_pic_cnt_present_flag : %u\n"
"transform_8x8_mode_flag : %u\n"
"pic_scaling_matrix_present_flag : %u\n"
"second_chroma_qp_index_offset : %u",
pps->pic_parameter_set_id,
pps->seq_parameter_set_id,
pps->entropy_coding_mode_flag,
pps->pic_order_present_flag,
pps->num_slice_groups_minus1,
pps->slice_group_map_type,
pps->slice_group_change_direction_flag,
pps->slice_group_change_rate_minus1,
pps->pic_size_in_map_units_minus1,
pps->num_ref_idx_l0_active_minus1,
pps->num_ref_idx_l1_active_minus1,
pps->weighted_pred_flag,
pps->weighted_bipred_idc,
pps->pic_init_qp_minus26,
pps->pic_init_qs_minus26,
pps->chroma_qp_index_offset,
pps->deblocking_filter_control_present_flag,
pps->constrained_intra_pred_flag,
pps->redundant_pic_cnt_present_flag,
pps->transform_8x8_mode_flag,
pps->pic_scaling_matrix_present_flag,
pps->second_chroma_qp_index_offset
);
#endif
if (!parse_nal_trailing_bits(this, src, size, offset))
return false;
@@ -503,23 +568,193 @@ static bool parse_nal_pps(NAL this, const uint8_t * src, size_t size, size_t * c
return true;
}
static bool parse_nal_ref_pic_list_reordering(NAL this, const uint8_t * src, size_t size, size_t * const offset)
{
//TODO
return false;
}
static bool parse_pred_weight_table(NAL this, const uint8_t * src, size_t size, size_t * const offset)
{
//TODO
return false;
}
static bool parse_dec_ref_pic_marking(NAL this, const uint8_t * src, size_t size, size_t * const offset)
{
//TODO
return false;
}
static bool parse_nal_coded_slice(
NAL this,
const uint8_t ref_idc,
const uint8_t ref_unit_type,
const uint8_t * src,
size_t size,
size_t * const offset
)
{
if (!this->sps_valid || !this->pps_valid)
return false;
NAL_SLICE * slice = &this->slice;
memset(slice, 0, sizeof(NAL_SLICE));
slice->first_mb_in_slice = decode_u_golomb(src, offset);
slice->slice_type = decode_u_golomb(src, offset);
slice->pic_parameter_set_id = decode_u_golomb(src, offset);
slice->frame_num = get_bits(src, offset, this->sps.log2_max_frame_num_minus4 + 4);
if (!this->sps.frame_mbs_only_flag)
{
slice->field_pic_flag = get_bit(src, offset);
if (slice->field_pic_flag)
slice->bottom_field_flag = get_bit(src, offset);
}
if (ref_unit_type == 5)
slice->idr_pic_id = decode_u_golomb(src, offset);
if (this->sps.pic_order_cnt_type == 0)
{
slice->pic_order_cnt_lsb = get_bits(src, offset, this->sps.log2_max_pic_order_cnt_lsb_minus4 + 4);
if (this->pps.pic_order_present_flag && !slice->field_pic_flag)
slice->delta_pic_order_cnt_bottom = decode_s_golomb(src, offset);
}
else
if (this->sps.pic_order_cnt_type == 1 && !this->sps.delta_pic_order_always_zero_flag)
{
slice->delta_pic_order_cnt[0] = decode_s_golomb(src, offset);
if (this->pps.pic_order_present_flag && !slice->field_pic_flag)
slice->delta_pic_order_cnt[1] = decode_s_golomb(src, offset);
}
if (this->pps.redundant_pic_cnt_present_flag)
slice->redundant_pic_cnt = decode_u_golomb(src, offset);
if (slice->slice_type == NAL_SLICE_TYPE_B)
slice->direct_spatial_mv_pred_flag = get_bit(src, offset);
if (slice->slice_type == NAL_SLICE_TYPE_P ||
slice->slice_type == NAL_SLICE_TYPE_SP ||
slice->slice_type == NAL_SLICE_TYPE_B)
{
slice->num_ref_idx_active_override_flag = get_bit(src, offset);
if (slice->num_ref_idx_active_override_flag)
{
slice->num_ref_idx_l0_active_minus1 = decode_u_golomb(src, offset);
if (slice->slice_type == NAL_SLICE_TYPE_B)
slice->num_ref_idx_l1_active_minus1 = decode_u_golomb(src, offset);
}
}
if (!parse_nal_ref_pic_list_reordering(this, src, size, offset))
return false;
if ((this->pps.weighted_pred_flag && (slice->slice_type == NAL_SLICE_TYPE_P || slice->slice_type == NAL_SLICE_TYPE_SP)) ||
(this->pps.weighted_bipred_idc == 1 && slice->slice_type == NAL_SLICE_TYPE_B))
{
if (!parse_pred_weight_table(this, src, size, offset))
return false;
}
if (ref_idc != 0)
if (!parse_dec_ref_pic_marking(this, src, size, offset))
return false;
if (this->pps.entropy_coding_mode_flag && slice->slice_type != NAL_SLICE_TYPE_I && slice->slice_type != NAL_SLICE_TYPE_SI)
slice->cabac_init_idc = decode_u_golomb(src, offset);
slice->slice_qp_delta = decode_s_golomb(src, offset);
if (slice->slice_type == NAL_SLICE_TYPE_SP || slice->slice_type == NAL_SLICE_TYPE_SI)
{
if (slice->slice_type == NAL_SLICE_TYPE_SP)
slice->sp_for_switch_flag = get_bit(src, offset);
slice->slice_qs_delta = decode_s_golomb(src, offset);
}
if (this->pps.deblocking_filter_control_present_flag)
{
slice->disable_deblocking_filter_idc = decode_u_golomb(src, offset);
if (slice->disable_deblocking_filter_idc != 1)
{
slice->slice_alpha_c0_offset_div2 = decode_s_golomb(src, offset);
slice->slice_beta_offset_div2 = decode_s_golomb(src, offset);
}
}
if (this->pps.num_slice_groups_minus1 > 0 && this->pps.slice_group_map_type >= 3 && this->pps.slice_group_map_type <= 5)
slice->slice_group_change_cycle = decode_u_golomb(src, offset);
#ifdef DEBUG_NAL
DEBUG_INFO("SLICE:\n"
"first_mb_in_slice : %u\n"
"slice_type : %u\n"
"pic_parameter_set_id : %u\n"
"frame_num : %u\n"
"field_pic_flag : %u\n"
"bottom_field_flag : %u\n"
"idr_pic_id : %u\n"
"pic_order_cnt_lsb : %u\n"
"delta_pic_order_cnt_bottom : %d\n"
"delta_pic_order_cnt[0] : %d\n"
"delta_pic_order_cnt[1] : %d\n"
"redundant_pic_cnt : %u\n"
"direct_spatial_mv_pred_flag : %u\n"
"num_ref_idx_active_override_flag: %u\n"
"num_ref_idx_l0_active_minus1 : %u\n"
"num_ref_idx_l1_active_minus1 : %u",
slice->first_mb_in_slice,
slice->slice_type,
slice->pic_parameter_set_id,
slice->frame_num,
slice->field_pic_flag,
slice->bottom_field_flag,
slice->idr_pic_id,
slice->pic_order_cnt_lsb,
slice->delta_pic_order_cnt_bottom,
slice->delta_pic_order_cnt[0],
slice->delta_pic_order_cnt[1],
slice->redundant_pic_cnt,
slice->direct_spatial_mv_pred_flag,
slice->num_ref_idx_active_override_flag,
slice->num_ref_idx_l0_active_minus1,
slice->num_ref_idx_l1_active_minus1
);
#endif
if (!parse_nal_trailing_bits(this, src, size, offset))
return false;
this->slice_valid = true;
return true;
}
bool nal_parse(NAL this, const uint8_t * src, size_t size)
{
#ifdef DEBUG_NAL
static FILE * fd = NULL;
if (!fd)
fd = fopen("/tmp/stream.h264", "w");
fwrite(src, size, 1, fd);
fflush(fd);
#endif
const size_t bits = size << 4;
size_t offset = 0;
while(offset < bits)
for(size_t i = 0; i < size - 4; ++i)
{
// look for the start header
if (get_bits(src, &offset, 32) != 1)
{
offset -= 24;
if (src[i++] != 0 || src[i++] != 0)
continue;
}
if (src[i] == 0)
++i;
if (src[i++] != 1)
continue;
size_t offset = i << 3;
DEBUG_INFO("nal @ %lu (%lu)", i, offset);
// ensure the forbidden zero bit is not set
if (get_bit(src, &offset) != 0)
@@ -528,12 +763,19 @@ bool nal_parse(NAL this, const uint8_t * src, size_t size)
return false;
}
uint8_t nal_ref_idc = get_bits(src, &offset, 2);
uint8_t nal_ref_unit_type = get_bits(src, &offset, 5);
DEBUG_INFO("ref idc: %d, ref unit type: %d", nal_ref_idc, nal_ref_unit_type);
uint8_t ref_idc = get_bits(src, &offset, 2);
uint8_t ref_unit_type = get_bits(src, &offset, 5);
DEBUG_INFO("ref idc: %d, ref unit type: %d", ref_idc, ref_unit_type);
switch(nal_ref_unit_type)
switch(ref_unit_type)
{
case NAL_TYPE_CODED_SLICE_IDR:
case NAL_TYPE_CODED_SLICE_NON_IDR:
case NAL_TYPE_CODED_SLICE_AUX:
if (!parse_nal_coded_slice(this, ref_idc, ref_unit_type, src, size, &offset))
return false;
break;
case NAL_TYPE_AUD:
{
this->primary_pic_type = get_bits(src, &offset, 3);
@@ -554,14 +796,14 @@ bool nal_parse(NAL this, const uint8_t * src, size_t size)
break;
default:
DEBUG_ERROR("Unknown NAL ref unit type: %d", nal_ref_unit_type);
DEBUG_ERROR("Unknown NAL ref unit type: %d", ref_unit_type);
return false;
}
// byte align
offset = (offset + 0x7) & ~0x7;
i = offset >> 3;
}
DEBUG_INFO("return");
return true;
}
@@ -588,4 +830,13 @@ bool nal_get_pps(NAL this, const NAL_PPS ** pps)
*pps = &this->pps;
return true;
}
bool nal_get_slice(NAL this, const NAL_SLICE ** slice)
{
if (!this->slice_valid)
return false;
*slice = &this->slice;
return true;
}