The Master Guide Table is used in ATSC. Implementation according to specs A/65:2009 Signed-off-by: André Roth <neolynx@xxxxxxxxx> --- lib/include/descriptors/mgt.h | 79 +++++++++++++++++++++++ lib/libdvbv5/Makefile.am | 3 +- lib/libdvbv5/descriptors.c | 1 + lib/libdvbv5/descriptors/mgt.c | 140 +++++++++++++++++++++++++++++++++++++++++ 4 files changed, 222 insertions(+), 1 deletion(-) create mode 100644 lib/include/descriptors/mgt.h create mode 100644 lib/libdvbv5/descriptors/mgt.c diff --git a/lib/include/descriptors/mgt.h b/lib/include/descriptors/mgt.h new file mode 100644 index 0000000..9c583b4 --- /dev/null +++ b/lib/include/descriptors/mgt.h @@ -0,0 +1,79 @@ +/* + * Copyright (c) 2013 - Andre Roth <neolynx@xxxxxxxxx> + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation version 2 + * of the License. + * + * This program 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 General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + * Or, point your browser to http://www.gnu.org/licenses/old-licenses/gpl-2.0.html + * + */ + +#ifndef _MGT_H +#define _MGT_H + +#include <stdint.h> +#include <unistd.h> /* ssize_t */ + +#include "descriptors/atsc_header.h" +#include "descriptors.h" + +#define ATSC_TABLE_MGT 0xC7 + +struct atsc_table_mgt_table { + uint16_t type; + union { + uint16_t bitfield; + struct { + uint16_t pid:13; + uint16_t one:3; + } __attribute__((packed)); + } __attribute__((packed)); + uint8_t type_version:5; + uint8_t one2:3; + uint32_t size; + union { + uint16_t bitfield2; + struct { + uint16_t desc_length:12; + uint16_t one3:4; + } __attribute__((packed)); + } __attribute__((packed)); + struct dvb_desc *descriptor; + struct atsc_table_mgt_table *next; +} __attribute__((packed)); + +struct atsc_table_mgt { + struct atsc_table_header header; + uint16_t tables; + struct atsc_table_mgt_table *table; + struct dvb_desc *descriptor; +} __attribute__((packed)); + +#define atsc_mgt_table_foreach( _tran, _mgt ) \ + for( struct atsc_table_mgt_table *_tran = _mgt->table; _tran; _tran = _tran->next ) \ + +struct dvb_v5_fe_parms; + +#ifdef __cplusplus +extern "C" { +#endif + +void atsc_table_mgt_init (struct dvb_v5_fe_parms *parms, const uint8_t *buf, ssize_t buflen, uint8_t *table, ssize_t *table_length); +void atsc_table_mgt_free(struct atsc_table_mgt *mgt); +void atsc_table_mgt_print(struct dvb_v5_fe_parms *parms, struct atsc_table_mgt *mgt); + +#ifdef __cplusplus +} +#endif + +#endif diff --git a/lib/libdvbv5/Makefile.am b/lib/libdvbv5/Makefile.am index 2ad5902..44f68d4 100644 --- a/lib/libdvbv5/Makefile.am +++ b/lib/libdvbv5/Makefile.am @@ -48,7 +48,8 @@ libdvbv5_la_SOURCES = \ descriptors/nit.c ../include/descriptors/nit.h \ descriptors/sdt.c ../include/descriptors/sdt.h \ descriptors/vct.c ../include/descriptors/vct.h \ - descriptors/eit.c ../include/descriptors/eit.h + descriptors/eit.c ../include/descriptors/eit.h \ + descriptors/mgt.c ../include/descriptors/mgt.h \ libdvbv5_la_CPPFLAGS = $(ENFORCE_LIBDVBV5_STATIC) libdvbv5_la_LDFLAGS = $(LIBDVBV5_VERSION) $(ENFORCE_LIBDVBV5_STATIC) -lm diff --git a/lib/libdvbv5/descriptors.c b/lib/libdvbv5/descriptors.c index d0887f4..7385027 100644 --- a/lib/libdvbv5/descriptors.c +++ b/lib/libdvbv5/descriptors.c @@ -36,6 +36,7 @@ #include "descriptors/sdt.h" #include "descriptors/eit.h" #include "descriptors/vct.h" +#include "descriptors/mgt.h" #include "descriptors/desc_language.h" #include "descriptors/desc_network_name.h" #include "descriptors/desc_cable_delivery.h" diff --git a/lib/libdvbv5/descriptors/mgt.c b/lib/libdvbv5/descriptors/mgt.c new file mode 100644 index 0000000..7279982 --- /dev/null +++ b/lib/libdvbv5/descriptors/mgt.c @@ -0,0 +1,140 @@ +/* + * Copyright (c) 2013 - Andre Roth <neolynx@xxxxxxxxx> + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation version 2 + * of the License. + * + * This program 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 General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + * Or, point your browser to http://www.gnu.org/licenses/old-licenses/gpl-2.0.html + * + */ + +#include "descriptors/mgt.h" +#include "dvb-fe.h" + +void atsc_table_mgt_init(struct dvb_v5_fe_parms *parms, const uint8_t *buf, ssize_t buflen, uint8_t *table, ssize_t *table_length) +{ + const uint8_t *p = buf, *endbuf = buf + buflen - 4; /* minus CRC */ + struct atsc_table_mgt *mgt = (struct atsc_table_mgt *) table; + struct dvb_desc **head_desc; + struct atsc_table_mgt_table **head; + int i = 0; + struct atsc_table_mgt_table *last = NULL; + size_t size = offsetof(struct atsc_table_mgt, table); + + if (p + size > endbuf) { + dvb_logerr("%s: short read %zd/%zd bytes", __func__, + size, endbuf - p); + return; + } + + if (*table_length > 0) { + /* find end of curent lists */ + head_desc = &mgt->descriptor; + while (*head_desc != NULL) + head_desc = &(*head_desc)->next; + head = &mgt->table; + while (*head != NULL) + head = &(*head)->next; + + /* FIXME: read current mgt->tables for loop below */ + } else { + memcpy(table, p, size); + *table_length = sizeof(struct atsc_table_mgt); + + bswap16(mgt->tables); + + mgt->descriptor = NULL; + mgt->table = NULL; + head_desc = &mgt->descriptor; + head = &mgt->table; + } + p += size; + + while (i++ < mgt->tables && p < endbuf) { + struct atsc_table_mgt_table *table; + + size = offsetof(struct atsc_table_mgt_table, descriptor); + if (p + size > endbuf) { + dvb_logerr("%s: short read %zd/%zd bytes", __func__, + size, endbuf - p); + return; + } + table = (struct atsc_table_mgt_table *) malloc(sizeof(struct atsc_table_mgt_table)); + memcpy(table, p, size); + p += size; + + bswap16(table->type); + bswap16(table->bitfield); + bswap16(table->bitfield2); + bswap32(table->size); + table->descriptor = NULL; + table->next = NULL; + + if(!*head) + *head = table; + if(last) + last->next = table; + + /* get the descriptors for each table */ + size = table->desc_length; + if (p + size > endbuf) { + dvb_logerr("%s: short read %zd/%zd bytes", __func__, + size, endbuf - p); + return; + } + dvb_parse_descriptors(parms, p, size, &table->descriptor); + + p += size; + last = table; + } + /* TODO: parse MGT descriptors here into head_desc */ +} + +void atsc_table_mgt_free(struct atsc_table_mgt *mgt) +{ + struct atsc_table_mgt_table *table = mgt->table; + + dvb_free_descriptors((struct dvb_desc **) &mgt->descriptor); + while(table) { + struct atsc_table_mgt_table *tmp = table; + + dvb_free_descriptors((struct dvb_desc **) &table->descriptor); + table = table->next; + free(tmp); + } + free(mgt); +} + +void atsc_table_mgt_print(struct dvb_v5_fe_parms *parms, struct atsc_table_mgt *mgt) +{ + const struct atsc_table_mgt_table *table = mgt->table; + uint16_t tables = 0; + + dvb_log("MGT"); + atsc_table_header_print(parms, &mgt->header); + dvb_log("| tables %d", mgt->tables); + while(table) { + dvb_log("|- type %04x %d", table->type, table->pid); + dvb_log("| one %d", table->one); + dvb_log("| one2 %d", table->one2); + dvb_log("| type version %d", table->type_version); + dvb_log("| size %d", table->size); + dvb_log("| one3 %d", table->one3); + dvb_log("| desc_length %d", table->desc_length); + dvb_print_descriptors(parms, table->descriptor); + table = table->next; + tables++; + } + dvb_log("|_ %d tables", tables); +} + -- 1.8.3.2 -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
