?? gethdr.c
字號:
printf(" low_delay=%d\n",low_delay);
printf(" frame_rate_extension_n=%d\n",frame_rate_extension_n);
printf(" frame_rate_extension_d=%d\n",frame_rate_extension_d);
}
}
#endif /* VERBOSE */
#ifdef VERIFY
verify_sequence_extension++;
#endif /* VERIFY */
}
/* decode sequence display extension */
static void sequence_display_extension()
{
int pos;
pos = ld->Bitcnt;
video_format = Get_Bits(3);
color_description = Get_Bits(1);
if (color_description)
{
color_primaries = Get_Bits(8);
transfer_characteristics = Get_Bits(8);
matrix_coefficients = Get_Bits(8);
}
display_horizontal_size = Get_Bits(14);
marker_bit("sequence_display_extension");
display_vertical_size = Get_Bits(14);
#ifdef VERBOSE
if (Verbose_Flag>NO_LAYER)
{
printf("sequence display extension (byte %d)\n",(pos>>3)-4);
if (Verbose_Flag>SEQUENCE_LAYER)
{
printf(" video_format=%d\n",video_format);
printf(" color_description=%d\n",color_description);
if (color_description)
{
printf(" color_primaries=%d\n",color_primaries);
printf(" transfer_characteristics=%d\n",transfer_characteristics);
printf(" matrix_coefficients=%d\n",matrix_coefficients);
}
printf(" display_horizontal_size=%d\n",display_horizontal_size);
printf(" display_vertical_size=%d\n",display_vertical_size);
}
}
#endif /* VERBOSE */
#ifdef VERIFY
verify_sequence_display_extension++;
#endif /* VERIFY */
}
/* decode quant matrix entension */
/* ISO/IEC 13818-2 section 6.2.3.2 */
static void quant_matrix_extension()
{
int i;
int pos;
pos = ld->Bitcnt;
if((ld->load_intra_quantizer_matrix = Get_Bits(1)))
{
for (i=0; i<64; i++)
{
ld->chroma_intra_quantizer_matrix[scan[ZIG_ZAG][i]]
= ld->intra_quantizer_matrix[scan[ZIG_ZAG][i]]
= Get_Bits(8);
}
}
if((ld->load_non_intra_quantizer_matrix = Get_Bits(1)))
{
for (i=0; i<64; i++)
{
ld->chroma_non_intra_quantizer_matrix[scan[ZIG_ZAG][i]]
= ld->non_intra_quantizer_matrix[scan[ZIG_ZAG][i]]
= Get_Bits(8);
}
}
if((ld->load_chroma_intra_quantizer_matrix = Get_Bits(1)))
{
for (i=0; i<64; i++)
ld->chroma_intra_quantizer_matrix[scan[ZIG_ZAG][i]] = Get_Bits(8);
}
if((ld->load_chroma_non_intra_quantizer_matrix = Get_Bits(1)))
{
for (i=0; i<64; i++)
ld->chroma_non_intra_quantizer_matrix[scan[ZIG_ZAG][i]] = Get_Bits(8);
}
#ifdef VERBOSE
if (Verbose_Flag>NO_LAYER)
{
printf("quant matrix extension (byte %d)\n",(pos>>3)-4);
printf(" load_intra_quantizer_matrix=%d\n",
ld->load_intra_quantizer_matrix);
printf(" load_non_intra_quantizer_matrix=%d\n",
ld->load_non_intra_quantizer_matrix);
printf(" load_chroma_intra_quantizer_matrix=%d\n",
ld->load_chroma_intra_quantizer_matrix);
printf(" load_chroma_non_intra_quantizer_matrix=%d\n",
ld->load_chroma_non_intra_quantizer_matrix);
}
#endif /* VERBOSE */
#ifdef VERIFY
verify_quant_matrix_extension++;
#endif /* VERIFY */
}
/* decode sequence scalable extension */
/* ISO/IEC 13818-2 section 6.2.2.5 */
static void sequence_scalable_extension()
{
int pos;
pos = ld->Bitcnt;
/* values (without the +1 offset) of scalable_mode are defined in
Table 6-10 of ISO/IEC 13818-2 */
ld->scalable_mode = Get_Bits(2) + 1; /* add 1 to make SC_DP != SC_NONE */
layer_id = Get_Bits(4);
if (ld->scalable_mode==SC_SPAT)
{
lower_layer_prediction_horizontal_size = Get_Bits(14);
marker_bit("sequence_scalable_extension()");
lower_layer_prediction_vertical_size = Get_Bits(14);
horizontal_subsampling_factor_m = Get_Bits(5);
horizontal_subsampling_factor_n = Get_Bits(5);
vertical_subsampling_factor_m = Get_Bits(5);
vertical_subsampling_factor_n = Get_Bits(5);
}
if (ld->scalable_mode==SC_TEMP)
Error("temporal scalability not implemented\n");
#ifdef VERBOSE
if (Verbose_Flag>NO_LAYER)
{
printf("sequence scalable extension (byte %d)\n",(pos>>3)-4);
if (Verbose_Flag>SEQUENCE_LAYER)
{
printf(" scalable_mode=%d\n",ld->scalable_mode-1);
printf(" layer_id=%d\n",layer_id);
if (ld->scalable_mode==SC_SPAT)
{
printf(" lower_layer_prediction_horiontal_size=%d\n",
lower_layer_prediction_horizontal_size);
printf(" lower_layer_prediction_vertical_size=%d\n",
lower_layer_prediction_vertical_size);
printf(" horizontal_subsampling_factor_m=%d\n",
horizontal_subsampling_factor_m);
printf(" horizontal_subsampling_factor_n=%d\n",
horizontal_subsampling_factor_n);
printf(" vertical_subsampling_factor_m=%d\n",
vertical_subsampling_factor_m);
printf(" vertical_subsampling_factor_n=%d\n",
vertical_subsampling_factor_n);
}
}
}
#endif /* VERBOSE */
#ifdef VERIFY
verify_sequence_scalable_extension++;
#endif /* VERIFY */
}
/* decode picture display extension */
/* ISO/IEC 13818-2 section 6.2.3.3. */
static void picture_display_extension()
{
int i;
int number_of_frame_center_offsets;
int pos;
pos = ld->Bitcnt;
/* based on ISO/IEC 13818-2 section 6.3.12
(November 1994) Picture display extensions */
/* derive number_of_frame_center_offsets */
if(progressive_sequence)
{
if(repeat_first_field)
{
if(top_field_first)
number_of_frame_center_offsets = 3;
else
number_of_frame_center_offsets = 2;
}
else
{
number_of_frame_center_offsets = 1;
}
}
else
{
if(picture_structure!=FRAME_PICTURE)
{
number_of_frame_center_offsets = 1;
}
else
{
if(repeat_first_field)
number_of_frame_center_offsets = 3;
else
number_of_frame_center_offsets = 2;
}
}
/* now parse */
for (i=0; i<number_of_frame_center_offsets; i++)
{
frame_center_horizontal_offset[i] = Get_Bits(16);
marker_bit("picture_display_extension, first marker bit");
frame_center_vertical_offset[i] = Get_Bits(16);
marker_bit("picture_display_extension, second marker bit");
}
#ifdef VERBOSE
if (Verbose_Flag>NO_LAYER)
{
printf("picture display extension (byte %d)\n",(pos>>3)-4);
if (Verbose_Flag>SEQUENCE_LAYER)
{
for (i=0; i<number_of_frame_center_offsets; i++)
{
printf(" frame_center_horizontal_offset[%d]=%d\n",i,
frame_center_horizontal_offset[i]);
printf(" frame_center_vertical_offset[%d]=%d\n",i,
frame_center_vertical_offset[i]);
}
}
}
#endif /* VERBOSE */
#ifdef VERIFY
verify_picture_display_extension++;
#endif /* VERIFY */
}
/* decode picture coding extension */
static void picture_coding_extension()
{
int pos;
pos = ld->Bitcnt;
f_code[0][0] = Get_Bits(4);
f_code[0][1] = Get_Bits(4);
f_code[1][0] = Get_Bits(4);
f_code[1][1] = Get_Bits(4);
intra_dc_precision = Get_Bits(2);
picture_structure = Get_Bits(2);
top_field_first = Get_Bits(1);
frame_pred_frame_dct = Get_Bits(1);
concealment_motion_vectors = Get_Bits(1);
ld->q_scale_type = Get_Bits(1);
intra_vlc_format = Get_Bits(1);
ld->alternate_scan = Get_Bits(1);
repeat_first_field = Get_Bits(1);
chroma_420_type = Get_Bits(1);
progressive_frame = Get_Bits(1);
composite_display_flag = Get_Bits(1);
if (composite_display_flag)
{
v_axis = Get_Bits(1);
field_sequence = Get_Bits(3);
sub_carrier = Get_Bits(1);
burst_amplitude = Get_Bits(7);
sub_carrier_phase = Get_Bits(8);
}
#ifdef VERBOSE
if (Verbose_Flag>NO_LAYER)
{
printf("picture coding extension (byte %d)\n",(pos>>3)-4);
if (Verbose_Flag>SEQUENCE_LAYER)
{
printf(" forward horizontal f_code=%d\n", f_code[0][0]);
printf(" forward vertical f_code=%d\n", f_code[0][1]);
printf(" backward horizontal f_code=%d\n", f_code[1][0]);
printf(" backward_vertical f_code=%d\n", f_code[1][1]);
printf(" intra_dc_precision=%d\n",intra_dc_precision);
printf(" picture_structure=%d\n",picture_structure);
printf(" top_field_first=%d\n",top_field_first);
printf(" frame_pred_frame_dct=%d\n",frame_pred_frame_dct);
printf(" concealment_motion_vectors=%d\n",concealment_motion_vectors);
printf(" q_scale_type=%d\n",ld->q_scale_type);
printf(" intra_vlc_format=%d\n",intra_vlc_format);
printf(" alternate_scan=%d\n",ld->alternate_scan);
printf(" repeat_first_field=%d\n",repeat_first_field);
printf(" chroma_420_type=%d\n",chroma_420_type);
printf(" progressive_frame=%d\n",progressive_frame);
printf(" composite_display_flag=%d\n",composite_display_flag);
if (composite_display_flag)
{
printf(" v_axis=%d\n",v_axis);
printf(" field_sequence=%d\n",field_sequence);
printf(" sub_carrier=%d\n",sub_carrier);
printf(" burst_amplitude=%d\n",burst_amplitude);
printf(" sub_carrier_phase=%d\n",sub_carrier_phase);
}
}
}
#endif /* VERBOSE */
#ifdef VERIFY
verify_picture_coding_extension++;
#endif /* VERIFY */
}
/* decode picture spatial scalable extension */
/* ISO/IEC 13818-2 section 6.2.3.5. */
static void picture_spatial_scalable_extension()
{
int pos;
pos = ld->Bitcnt;
ld->pict_scal = 1; /* use spatial scalability in this picture */
lower_layer_temporal_reference = Get_Bits(10);
marker_bit("picture_spatial_scalable_extension(), first marker bit");
lower_layer_horizontal_offset = Get_Bits(15);
if (lower_layer_horizontal_offset>=16384)
lower_layer_horizontal_offset-= 32768;
marker_bit("picture_spatial_scalable_extension(), second marker bit");
lower_layer_vertical_offset = Get_Bits(15);
if (lower_layer_vertical_offset>=16384)
lower_layer_vertical_offset-= 32768;
spatial_temporal_weight_code_table_index = Get_Bits(2);
lower_layer_progressive_frame = Get_Bits(1);
lower_layer_deinterlaced_field_select = Get_Bits(1);
#ifdef VERBOSE
if (Verbose_Flag>NO_LAYER)
{
printf("picture spatial scalable extension (byte %d)\n",(pos>>3)-4);
if (Verbose_Flag>SEQUENCE_LAYER)
{
printf(" lower_layer_temporal_reference=%d\n",lower_layer_temporal_reference);
printf(" lower_layer_horizontal_offset=%d\n",lower_layer_horizontal_offset);
printf(" lower_layer_vertical_offset=%d\n",lower_layer_vertical_offset);
printf(" spatial_temporal_weight_code_table_index=%d\n",
spatial_temporal_weight_code_table_index);
printf(" lower_layer_progressive_frame=%d\n",lower_layer_progressive_frame);
printf(" lower_layer_deinterlaced_field_select=%d\n",lower_layer_deinterlaced_field_select);
}
}
#endif /* VERBOSE */
#ifdef VERIFY
verify_picture_spatial_scalable_extension++;
#endif /* VERIFY */
}
/* decode picture temporal scalable extension
*
* not implemented
*/
/* ISO/IEC 13818-2 section 6.2.3.4. */
static void picture_temporal_scalable_extension()
{
Error("temporal scalability not supported\n");
#ifdef VERIFY
verify_picture_temporal_scalable_extension++;
#endif /* VERIFY */
}
/* decode extra bit information */
/* ISO/IEC 13818-2 section 6.2.3.4. */
static int extra_bit_information()
{
int Byte_Count = 0;
while (Get_Bits1())
{
Flush_Buffer(8);
Byte_Count++;
}
return(Byte_Count);
}
/* ISO/IEC 13818-2 section 5.3 */
/* Purpose: this function is mainly designed to aid in bitstream conformance
testing. A simple Flush_Buffer(1) would do */
void marker_bit(text)
char *text;
{
int marker;
marker = Get_Bits(1);
#ifdef VERIFY
if(!marker)
printf("ERROR: %s--marker_bit set to 0",text);
#endif
}
/* ISO/IEC 13818-2 sections 6.3.4.1 and 6.2.2.2.2 */
static void user_data()
{
/* skip ahead to the next start code */
next_start_code();
}
/* Copyright extension */
/* ISO/IEC 13818-2 section 6.2.3.6. */
/* (header added in November, 1994 to the IS document) */
static void copyright_extension()
{
int pos;
int reserved_data;
pos = ld->Bitcnt;
copyright_flag = Get_Bits(1);
copyright_identifier = Get_Bits(8);
original_or_copy = Get_Bits(1);
/* reserved */
reserved_data = Get_Bits(7);
marker_bit("copyright_extension(), first marker bit");
copyright_number_1 = Get_Bits(20);
marker_bit("copyright_extension(), second marker bit");
copyright_number_2 = Get_Bits(22);
marker_bit("copyright_extension(), third marker bit");
copyright_number_3 = Get_Bits(22);
if(Verbose_Flag>NO_LAYER)
{
printf("copyright_extension (byte %d)\n",(pos>>3)-4);
if (Verbose_Flag>SEQUENCE_LAYER)
{
printf(" copyright_flag =%d\n",copyright_flag);
printf(" copyright_identifier=%d\n",copyright_identifier);
printf(" original_or_copy = %d (original=1, copy=0)\n",
original_or_copy);
printf(" copyright_number_1=%d\n",copyright_number_1);
printf(" copyright_number_2=%d\n",copyright_number_2);
printf(" copyright_number_3=%d\n",copyright_number_3);
}
}
#ifdef VERIFY
verify_copyright_extension++;
#endif /* VERIFY */
}
/* introduced in September 1995 to assist Spatial Scalability */
static void Update_Temporal_Reference_Tacking_Data()
{
static int temporal_reference_wrap = 0;
static int temporal_reference_old = 0;
if (ld == &base) /* *CH* */
{
if (picture_coding_type!=B_TYPE && temporal_reference!=temporal_reference_old)
/* check first field of */
{
/* non-B-frame */
if (temporal_reference_wrap)
{/* wrap occured at previous I- or P-frame */
/* now all intervening B-frames which could
still have high temporal_reference values are done */
Temporal_Reference_Base += 1024;
temporal_reference_wrap = 0;
}
/* distinguish from a reset */
if (temporal_reference<temporal_reference_old && !Temporal_Reference_GOP_Reset)
temporal_reference_wrap = 1; /* we must have just passed a GOP-Header! */
temporal_reference_old = temporal_reference;
Temporal_Reference_GOP_Reset = 0;
}
True_Framenum = Temporal_Reference_Base + temporal_reference;
/* temporary wrap of TR at 1024 for M frames */
if (temporal_reference_wrap && temporal_reference <= temporal_reference_old)
True_Framenum += 1024;
True_Framenum_max = (True_Framenum > True_Framenum_max) ?
True_Framenum : True_Framenum_max;
}
}
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