kopia lustrzana https://github.com/kierank/libmpegts
76 wiersze
2.9 KiB
C
76 wiersze
2.9 KiB
C
/*****************************************************************************
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* atsc.c : ATSC specific functions
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*****************************************************************************
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* Copyright (C) 2010 Kieran Kunhya
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02111, USA.
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*****************************************************************************/
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#include "../common.h"
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#include "atsc.h"
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/* Second Loop of PMT */
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void parse_ac3_frame( ts_atsc_ac3_info *atsc_ac3_ctx, uint8_t *frame )
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{
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atsc_ac3_ctx->sample_rate_code = frame[4] >> 6;
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atsc_ac3_ctx->bsid = frame[5] >> 3;
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atsc_ac3_ctx->bit_rate_code = (frame[4] & 0x3f) >> 1;
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atsc_ac3_ctx->surround_mode = (frame[6] & 1) << 1 | (frame[7] >> 7);
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atsc_ac3_ctx->bsmod = frame[5] & 0x7;
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atsc_ac3_ctx->num_channels = frame[6] >> 5;
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}
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void write_atsc_ac3_descriptor( bs_t *s, ts_atsc_ac3_info *atsc_ac3_ctx )
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{
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bs_write( s, 8, ATSC_AC3_DESCRIPTOR_TAG ); // descriptor_tag
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bs_write( s, 8, 3 ); // descriptor_length
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bs_write( s, 3, atsc_ac3_ctx->sample_rate_code ); // sample_rate_code
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bs_write( s, 5, atsc_ac3_ctx->bsid ); // bsid
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bs_write( s, 6, atsc_ac3_ctx->bit_rate_code ); // bit_rate_code
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bs_write( s, 2, atsc_ac3_ctx->surround_mode ); // surround_mode
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bs_write( s, 3, atsc_ac3_ctx->bsmod ); // bsmod
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bs_write( s, 4, atsc_ac3_ctx->num_channels ); // num_channels
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bs_write1( s, 1 ); // full_svc
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}
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/* Also in EIT */
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// FIXME fill in the blanks
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void write_caption_service_descriptor( bs_t *s )
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{
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bs_write( s, 8, ATSC_CAPTION_SERVICE_DESCRIPTOR_TAG ); // descriptor_tag
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bs_write( s, 8, 0 ); // descriptor_length
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bs_write( s, 3, 0x7 ); // reserved
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bs_write( s, 5, 0 ); // number_of_services
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for( int i = 0; i < 0; i++ )
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{
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bs_write( s, 8, 0 ); // language[0]
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bs_write( s, 8, 0 ); // language[1]
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bs_write( s, 8, 0 ); // language[2]
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bs_write1( s, 0 ); // digital_cc
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bs_write1( s, 1 ); // reserved
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if( 0 )
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bs_write( s, 6, 0x3f ); // reserved
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else
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bs_write( s, 6, 0 ); // caption_service_number
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bs_write1( s, 0 ); // easy_reader
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bs_write1( s, 0 ); // wide_aspect_ratio
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bs_write( s, 13, 0x3fff ); // reserved
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}
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}
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