+++ /dev/null
-#include "../libzmpeg3.h"
-
-int zvideo_t::
-get_seq_hdr()
-{
- int i;
- int load_intra_quantizer_matrix, load_non_intra_quantizer_matrix;
-
-//zmsg("1\n");
- horizontal_size = vstream->get_bits(12);
- vertical_size = vstream->get_bits(12);
- //int aspect_ratio =
- vstream->get_bits(4);
- framerate_code = vstream->get_bits(4);
- bitrate = vstream->get_bits(18);
- vstream->get_bit_noptr(); /* marker bit (=1) */
- //int vbv_buffer_size =
- vstream->get_bits(10);
- //int constrained_parameters_flag =
- vstream->get_bit_noptr();
- frame_rate = frame_rate_table[framerate_code];
-
- load_intra_quantizer_matrix = vstream->get_bit_noptr();
- if( load_intra_quantizer_matrix ) {
- for( i=0; i<64; ++i )
- intra_quantizer_matrix[zigzag_scan_table[i]] = vstream->get_byte_noptr();
- }
- else {
- for( i=0; i<64; ++i )
- intra_quantizer_matrix[i] = default_intra_quantizer_matrix[i];
- }
-
- load_non_intra_quantizer_matrix = vstream->get_bit_noptr();
- if( load_non_intra_quantizer_matrix ) {
- for( i=0; i<64; ++i )
- non_intra_quantizer_matrix[zigzag_scan_table[i]] = vstream->get_byte_noptr();
- }
- else {
- for( i=0; i<64; ++i )
- non_intra_quantizer_matrix[i] = 16;
- }
-
-/* copy luminance to chrominance matrices */
- for( i=0; i<64; ++i ) {
- chroma_intra_quantizer_matrix[i] = intra_quantizer_matrix[i];
- chroma_non_intra_quantizer_matrix[i] = non_intra_quantizer_matrix[i];
- }
-
-//zmsg("100\n");
- return 0;
-}
-
-
-/* decode sequence extension */
-
-int zvideo_t::
-sequence_extension()
-{
- mpeg2 = 1;
- scalable_mode = slice_decoder_t::sc_NONE; /* unless overwritten by seq. scal. ext. */
- //int prof_lev =
- vstream->get_byte_noptr();
- prog_seq = vstream->get_bit_noptr();
- chroma_format = vstream->get_bits(2);
- int horizontal_size_extension = vstream->get_bits(2);
- int vertical_size_extension = vstream->get_bits(2);
- //int bit_rate_extension =
- vstream->get_bits(12);
- vstream->get_bit_noptr();
- //int vbv_buffer_size_extension =
- vstream->get_byte_noptr();
- //int low_delay =
- vstream->get_bit_noptr();
- //int frame_rate_extension_n =
- vstream->get_bits(2);
- //int frame_rate_extension_d =
- vstream->get_bits(5);
- horizontal_size = (horizontal_size_extension << 12) | (horizontal_size & 0x0fff);
- vertical_size = (vertical_size_extension << 12) | (vertical_size & 0x0fff);
- return 0;
-}
-
-
-/* decode sequence display extension */
-
-int zvideo_t::
-sequence_display_extension()
-{
- // int video_format =
- vstream->get_bits(3);
- int colour_description = vstream->get_bit_noptr();
-
- if( colour_description ) {
- //int colour_primaries =
- vstream->get_byte_noptr();
- //int transfer_characteristics =
- vstream->get_byte_noptr();
- matrix_coefficients = vstream->get_byte_noptr();
- }
-
- //int display_horizontal_size =
- vstream->get_bits(14);
- vstream->get_bit_noptr();
- //int display_vertical_size =
- vstream->get_bits(14);
- return 0;
-}
-
-
-/* decode quant matrix entension */
-
-int zvideo_t::
-quant_matrix_extension()
-{
- int i;
- int load_intra_quantiser_matrix, load_non_intra_quantiser_matrix;
- int load_chroma_intra_quantiser_matrix;
- int load_chroma_non_intra_quantiser_matrix;
-
- load_intra_quantiser_matrix = vstream->get_bit_noptr();
- if( load_intra_quantiser_matrix != 0 ) {
- for( i=0; i<64; ++i ) {
- chroma_intra_quantizer_matrix[zigzag_scan_table[i]]
- = intra_quantizer_matrix[zigzag_scan_table[i]]
- = vstream->get_byte_noptr();
- }
- }
-
- load_non_intra_quantiser_matrix = vstream->get_bit_noptr();
- if( load_non_intra_quantiser_matrix != 0 ) {
- for( i=0; i<64; ++i ) {
- chroma_non_intra_quantizer_matrix[zigzag_scan_table[i]]
- = non_intra_quantizer_matrix[zigzag_scan_table[i]]
- = vstream->get_byte_noptr();
- }
- }
-
- load_chroma_intra_quantiser_matrix = vstream->get_bit_noptr();
- if( load_chroma_intra_quantiser_matrix != 0 ) {
- for( i=0; i<64; ++i )
- chroma_intra_quantizer_matrix[zigzag_scan_table[i]] = vstream->get_byte_noptr();
- }
-
- load_chroma_non_intra_quantiser_matrix = vstream->get_bit_noptr();
- if( load_chroma_non_intra_quantiser_matrix != 0 ) {
- for( i=0; i<64; ++i )
- chroma_non_intra_quantizer_matrix[zigzag_scan_table[i]] = vstream->get_byte_noptr();
- }
-
- return 0;
-}
-
-
-/* decode sequence scalable extension */
-
-int zvideo_t::
-sequence_scalable_extension()
-{
- scalable_mode = vstream->get_bits(2) + 1; /* add 1 to make sc_DP != sc_NONE */
- //int layer_id =
- vstream->get_bits(4);
-
- if( scalable_mode == slice_decoder_t::sc_SPAT ) {
- llw = vstream->get_bits(14); /* lower_layer_prediction_horizontal_size */
- vstream->get_bit_noptr();
- llh = vstream->get_bits(14); /* lower_layer_prediction_vertical_size */
- hm = vstream->get_bits(5);
- hn = vstream->get_bits(5);
- vm = vstream->get_bits(5);
- vn = vstream->get_bits(5);
- }
-
- if( scalable_mode == slice_decoder_t::sc_TEMP )
- zerr("temporal scalability not implemented\n");
- return 0;
-}
-
-
-/* decode picture display extension */
-
-int zvideo_t::
-picture_display_extension()
-{
-// short frame_centre_horizontal_offset[3];
-// short frame_centre_vertical_offset[3];
-/* per spec */
- int n = prog_seq ? (!repeatfirst ? 1 : (!topfirst ? 2 : 3)) :
- pict_struct != pics_FRAME_PICTURE ? 1 : (!repeatfirst ? 2 : 3) ;
-
- for( int i=0; i<n; ++i ) {
- //frame_centre_horizontal_offset[i] = (short)
- vstream->get_bits(16);
- vstream->get_bit_noptr();
- //frame_centre_vertical_offset[i] = (short)
- vstream->get_bits(16);
- vstream->get_bit_noptr();
- }
- return 0;
-}
-
-
-/* decode picture coding extension */
-
-int zvideo_t::
-picture_coding_extension()
-{
- h_forw_r_size = vstream->get_bits(4) - 1;
- v_forw_r_size = vstream->get_bits(4) - 1;
- h_back_r_size = vstream->get_bits(4) - 1;
- v_back_r_size = vstream->get_bits(4) - 1;
- dc_prec = vstream->get_bits(2);
- pict_struct = vstream->get_bits(2);
- topfirst = vstream->get_bit_noptr();
- frame_pred_dct = vstream->get_bit_noptr();
- conceal_mv = vstream->get_bit_noptr();
- qscale_type = vstream->get_bit_noptr();
- intravlc = vstream->get_bit_noptr();
- altscan = vstream->get_bit_noptr();
- repeatfirst = vstream->get_bit_noptr();
- //int chroma_420_type =
- vstream->get_bit_noptr();
- prog_frame = vstream->get_bit_noptr();
- if( repeat_fields > 2 ) repeat_fields = 0;
- repeat_fields += 2;
- if( repeatfirst ) {
- if( prog_seq ) repeat_fields += !topfirst ? 2 : 4;
- else if( prog_frame ) ++repeat_fields;
- }
- current_field = 0;
-
-//static const char *pstruct[] = { "nil", "top", "bot", "fld" };
-//zmsgs("pstruct %s prog_seq%d prog_frame%d topfirst%d repeatfirst%d repeat_fields%d\n",
-// pstruct[pict_struct], prog_seq , prog_frame, topfirst, repeatfirst, repeat_fields);
-
- int composite_display_flag = vstream->get_bit_noptr();
- if( composite_display_flag ) {
- //int v_axis =
- vstream->get_bit_noptr();
- field_sequence = vstream->get_bits(3);
- //int sub_carrier =
- vstream->get_bit_noptr();
- //int burst_amplitude =
- vstream->get_bits(7);
- //int sub_carrier_phase =
- vstream->get_byte_noptr();
- }
- return 0;
-}
-
-/* decode picture spatial scalable extension */
-
-int zvideo_t::
-picture_spatial_scalable_extension()
-{
- pict_scal = 1; /* use spatial scalability in this picture */
- lltempref = vstream->get_bits(10);
- vstream->get_bit_noptr();
- llx0 = vstream->get_bits(15);
- if(llx0 >= 16384) llx0 -= 32768;
- vstream->get_bit_noptr();
- lly0 = vstream->get_bits(15);
- if(lly0 >= 16384) lly0 -= 32768;
- stwc_table_index = vstream->get_bits(2);
- llprog_frame = vstream->get_bit_noptr();
- llfieldsel = vstream->get_bit_noptr();
- return 0;
-}
-
-
-/* decode picture temporal scalable extension
- *
- * not implemented
- *
- */
-
-int zvideo_t::
-picture_temporal_scalable_extension()
-{
- zerr("temporal scalability not supported\n");
- return 0;
-}
-
-
-/* decode extension and user data */
-
-int zvideo_t::
-ext_user_data()
-{
- int zcode = vstream->next_start_code();
- if( zcode < 0 ) return 1;
- while( zcode == EXT_START_CODE || zcode == USER_START_CODE ) {
- vstream->refill();
- if( zcode == EXT_START_CODE ) {
- int ext_id = vstream->get_bits(4);
- switch(ext_id) {
- case ext_id_SEQ:
- sequence_extension();
- break;
- case ext_id_DISP:
- sequence_display_extension();
- break;
- case ext_id_QUANT:
- quant_matrix_extension();
- break;
- case ext_id_SEQSCAL:
- sequence_scalable_extension();
- break;
- case ext_id_PANSCAN:
- picture_display_extension();
- break;
- case ext_id_CODING:
- picture_coding_extension();
- break;
- case ext_id_SPATSCAL:
- picture_spatial_scalable_extension();
- break;
- case ext_id_TEMPSCAL:
- picture_temporal_scalable_extension();
- break;
- default:
- zerrs("reserved extension start code ID %d\n", ext_id);
- break;
- }
- }
- else if( subtitle_track >= 0 ) {
- int32_t id = vstream->show_bits(32);
- if( id == 0x47413934 ) { /* "GA94" - atsc user data */
- vstream->refill();
- int typ = vstream->get_bits(8);
- if( typ == 3 ) /* mpeg cc */
- get_cc()->get_atsc_data(vstream);
- }
- }
- zcode = vstream->next_start_code();
- if( zcode < 0 ) return 1;
- }
-//zmsgs("prog_seq=%d prog_frame=%d\n", prog_seq,prog_frame);
- return 0;
-}
-
-
-/* decode group of pictures header */
-
-int zvideo_t::
-get_gop_header()
-{
-//zmsg("1\n");
- has_gops = 1;
- //int drop_flag =
- vstream->get_bit_noptr();
- gop_timecode.hour = vstream->get_bits(5);
- gop_timecode.minute = vstream->get_bits(6);
- vstream->get_bit_noptr();
- gop_timecode.second = vstream->get_bits(6);
- gop_timecode.frame = vstream->get_bits(6);
- //int closed_gop =
- vstream->get_bit_noptr();
- //int broken_link =
- vstream->get_bit_noptr();
-//zmsg("100\n");
-//zmsgs("%d:%d:%d:%d %d %d %d\n",
-// gop_timecode.hour, gop_timecode.minute, gop_timecode.second,
-// gop_timecode.frame, drop_flag, closed_gop, broken_link);
- return vstream->error();
-}
-
-/* decode picture header */
-
-int zvideo_t::
-get_picture_hdr()
-{
- pict_scal = 0; /* unless overwritten by pict. spat. scal. ext. */
- //int temp_ref =
- vstream->get_bits(10);
- pict_type = vstream->get_bits(3);
- //int vbv_delay =
- vstream->get_bits(16);
- if( pict_type == pic_type_P || pict_type == pic_type_B ) {
- full_forw = vstream->get_bit_noptr();
- forw_r_size = vstream->get_bits(3) - 1;
- }
-
- if( pict_type == pic_type_B ) {
- full_back = vstream->get_bit_noptr();
- back_r_size = vstream->get_bits(3) - 1;
- }
-
-/* get extra bit picture */
- while( !vstream->eof() && vstream->get_bit_noptr() )
- vstream->get_bits_noptr(8);
- return 0;
-}
-
-
-/* move to start of header. */
-/* this updates the demuxer times */
-int zvideo_t::
-find_header()
-{
- for( int count=0x1000; --count>=0; ) {
- int zcode = vstream->next_start_code();
- if( zcode < 0 ) break;
- switch(zcode) {
- case SEQUENCE_START_CODE:
- case GOP_START_CODE:
- case PICTURE_START_CODE:
- return 0;
- }
- vstream->refill();
- }
-
- return 1;
-}
-
-
-int zvideo_t::
-get_header()
-{
-// Stop search after this many start codes
- for( int count=0x1000; --count>=0; ) {
-/* look for startcode */
- int zcode = vstream->next_start_code();
- if( zcode < 0 ) break;
- vstream->refill();
-
- switch(zcode) {
- case SEQUENCE_START_CODE:
-/* a sequence header should be found before returning from get_header the */
-/* first time (this is to set horizontal/vertical size properly) */
- found_seqhdr = 1;
- get_seq_hdr();
- ext_user_data();
- break;
-
- case GOP_START_CODE:
- get_gop_header();
- ext_user_data();
- break;
-
- case PICTURE_START_CODE:
- get_picture_hdr();
- ext_user_data();
- if( cc ) cc->reorder();
- if( found_seqhdr )
- return 0; /* Exit here */
- break;
- }
- }
-
- return 1;
-}
-
-int zslice_buffer_t::
-ext_bit_info()
-{
- while( get_bit() ) get_bits(8);
- return 0;
-}
-
-/* decode slice header */
-int zslice_decoder_t::
-get_slice_hdr()
-{
- int slice_vertical_position_extension;
- int qs;
- slice_vertical_position_extension =
- (video->mpeg2 && video->vertical_size>2800) ?
- slice_buffer->get_bits(3) : 0;
-
- if( video->scalable_mode == sc_DP )
- pri_brk = slice_buffer->get_bits(7);
-
- qs = slice_buffer->get_bits(5);
- quant_scale = video->mpeg2 ?
- (video->qscale_type ? non_linear_mquant_table[qs] : (qs << 1)) :
- qs;
-
-//int intra_slice = 0;
- if( slice_buffer->get_bit() ) {
- //intra_slice =
- slice_buffer->get_bit();
- slice_buffer->get_bits(7);
- slice_buffer->ext_bit_info();
- }
-
- return slice_vertical_position_extension;
-}
-
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