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257 lines
6.9 KiB
C
257 lines
6.9 KiB
C
/*
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* camconditionalaccess.c - CAM (EN50221) Conditional Access Resource
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* Copyright (C) 2007 Alessandro Decina
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*
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* Authors:
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* Alessandro Decina <alessandro.d@gmail.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#include <unistd.h>
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#include <string.h>
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#include "camutils.h"
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#include "camconditionalaccess.h"
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#define GST_CAT_DEFAULT cam_debug_cat
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#define TAG_CONDITIONAL_ACCESS_INFO_ENQUIRY 0x9F8030
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#define TAG_CONDITIONAL_ACCESS_INFO_REPLY 0x9F8031
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#define TAG_CONDITIONAL_ACCESS_PMT 0x9F8032
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#define TAG_CONDITIONAL_ACCESS_PMT_REPLY 0x9F8033
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static CamReturn session_request_impl (CamALApplication * application,
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CamSLSession * session, CamSLResourceStatus * status);
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static CamReturn open_impl (CamALApplication * application,
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CamSLSession * session);
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static CamReturn close_impl (CamALApplication * application,
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CamSLSession * session);
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static CamReturn data_impl (CamALApplication * application,
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CamSLSession * session, guint tag, guint8 * buffer, guint length);
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CamConditionalAccess *
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cam_conditional_access_new (void)
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{
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CamConditionalAccess *cas;
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CamALApplication *application;
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cas = g_new0 (CamConditionalAccess, 1);
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application = CAM_AL_APPLICATION (cas);
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_cam_al_application_init (application);
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application->resource_id = CAM_AL_CONDITIONAL_ACCESS_ID;
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application->session_request = session_request_impl;
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application->open = open_impl;
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application->close = close_impl;
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application->data = data_impl;
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cas->ready = FALSE;
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return cas;
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}
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void
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cam_conditional_access_destroy (CamConditionalAccess * cas)
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{
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_cam_al_application_destroy (CAM_AL_APPLICATION (cas));
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g_free (cas);
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}
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static CamReturn
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send_ca_pmt (CamConditionalAccess * cas, GstMpegtsPMT * pmt,
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guint8 list_management, guint8 cmd_id)
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{
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CamReturn ret;
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guint8 *buffer;
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guint buffer_size;
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guint offset;
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guint8 *ca_pmt;
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guint ca_pmt_size;
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GList *walk;
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ca_pmt = cam_build_ca_pmt (pmt, list_management, cmd_id, &ca_pmt_size);
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cam_al_calc_buffer_size (CAM_AL_APPLICATION (cas)->al,
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ca_pmt_size, &buffer_size, &offset);
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buffer = g_malloc0 (buffer_size);
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memcpy (buffer + offset, ca_pmt, ca_pmt_size);
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for (walk = CAM_AL_APPLICATION (cas)->sessions; walk; walk = walk->next) {
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CamSLSession *session = CAM_SL_SESSION (walk->data);
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ret = cam_al_application_write (CAM_AL_APPLICATION (cas), session,
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TAG_CONDITIONAL_ACCESS_PMT, buffer, buffer_size, ca_pmt_size);
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if (CAM_FAILED (ret)) {
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GST_ERROR ("error sending ca_pmt to slot %d, error: %d",
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session->connection->slot, ret);
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continue;
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}
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}
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g_free (ca_pmt);
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g_free (buffer);
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return CAM_RETURN_OK;
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}
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CamReturn
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cam_conditional_access_set_pmt (CamConditionalAccess * cas,
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GstMpegtsPMT * pmt, CamConditionalAccessPmtFlag flag)
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{
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return send_ca_pmt (cas, pmt, flag, 0x01 /* ok_descrambling */ );
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}
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static CamReturn
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send_simple (CamConditionalAccess * cas, CamSLSession * session, guint tag)
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{
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guint8 *buffer;
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guint offset;
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guint buffer_size;
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CamReturn ret;
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cam_al_calc_buffer_size (CAM_AL_APPLICATION (cas)->al, 0, &buffer_size,
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&offset);
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buffer = g_malloc (buffer_size);
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ret = cam_al_application_write (CAM_AL_APPLICATION (cas), session,
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tag, buffer, buffer_size, 0);
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g_free (buffer);
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return ret;
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}
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static CamReturn
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send_conditional_access_enquiry (CamConditionalAccess * cas,
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CamSLSession * session)
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{
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GST_DEBUG ("sending application CAS enquiry");
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return send_simple (cas, session, TAG_CONDITIONAL_ACCESS_INFO_ENQUIRY);
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}
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static CamReturn
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session_request_impl (CamALApplication * application,
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CamSLSession * session, CamSLResourceStatus * status)
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{
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*status = CAM_SL_RESOURCE_STATUS_OPEN;
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return CAM_RETURN_OK;
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}
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static CamReturn
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open_impl (CamALApplication * application, CamSLSession * session)
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{
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CamConditionalAccess *cas = CAM_CONDITIONAL_ACCESS (application);
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GST_INFO ("opening conditional access session %d", session->session_nb);
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return send_conditional_access_enquiry (cas, session);
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}
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static CamReturn
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close_impl (CamALApplication * application, CamSLSession * session)
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{
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GST_INFO ("closing conditional access session %d", session->session_nb);
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return CAM_RETURN_OK;
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}
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static CamReturn
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handle_conditional_access_info_reply (CamConditionalAccess * cas,
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CamSLSession * session, guint8 * buffer, guint length)
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{
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#ifndef GST_DISABLE_GST_DEBUG
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int i;
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guint16 cas_id;
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GST_INFO ("conditional access info enquiry reply");
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for (i = 0; i < length / 2; ++i) {
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cas_id = GST_READ_UINT16_BE (buffer);
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GST_INFO ("slot %d, cas_id 0x%x", session->connection->slot, cas_id);
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buffer += 2;
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}
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cas->ready = TRUE;
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#endif
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return CAM_RETURN_OK;
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}
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static CamReturn
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handle_conditional_access_pmt_reply (CamConditionalAccess * cas,
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CamSLSession * session, guint8 * buffer, guint length)
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{
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#ifndef GST_DISABLE_GST_DEBUG
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guint16 program_num;
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guint8 version_num, current_next_indicator;
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GST_INFO ("conditional access PMT reply");
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program_num = GST_READ_UINT16_BE (buffer);
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buffer += 2;
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GST_INFO ("program_number : %d", program_num);
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version_num = *buffer >> 1 & 0x1f;
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current_next_indicator = *buffer & 0x1;
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buffer++;
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GST_INFO ("version_num:%d, current_next_indicator:%d",
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version_num, current_next_indicator);
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GST_INFO ("CA_enable : %d (0x%x)", *buffer >> 7 ? *buffer & 0x7f : 0,
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*buffer);
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buffer++;
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length -= 4;
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while (length > 0) {
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guint16 PID = GST_READ_UINT16_BE (buffer);
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buffer += 2;
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GST_INFO ("PID 0x%x CA_enable : %d (0x%x)", PID,
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*buffer >> 7 ? *buffer & 0x7f : 0, *buffer);
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buffer++;
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length -= 3;
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}
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#endif
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return CAM_RETURN_OK;
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}
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static CamReturn
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data_impl (CamALApplication * application, CamSLSession * session,
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guint tag, guint8 * buffer, guint length)
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{
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CamReturn ret;
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CamConditionalAccess *cas = CAM_CONDITIONAL_ACCESS (application);
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switch (tag) {
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case TAG_CONDITIONAL_ACCESS_INFO_REPLY:
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ret = handle_conditional_access_info_reply (cas, session, buffer, length);
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break;
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case TAG_CONDITIONAL_ACCESS_PMT_REPLY:
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ret = handle_conditional_access_pmt_reply (cas, session, buffer, length);
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break;
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default:
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GST_WARNING ("Got unknown callback, tag 0x%x", tag);
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g_return_val_if_reached (CAM_RETURN_ERROR);
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}
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return ret;
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}
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