void program_map_section_free(program_map_section_t *pms) {
if (pms == NULL)
return;
if (pms->descriptors != NULL) {
vqarray_foreach(pms->descriptors, descriptor_free);
vqarray_free(pms->descriptors);
}
if (pms->es_info) {
vqarray_foreach(pms->es_info, (vqarray_functor_t) es_info_free);
vqarray_free(pms->es_info);
}
free(pms);
}
void es_info_free(elementary_stream_info_t *es) {
if (es == NULL)
return;
if (es->descriptors != NULL) {
vqarray_foreach(es->descriptors, descriptor_free);
vqarray_free(es->descriptors);
}
free(es);
}
void conditional_access_section_free(conditional_access_section_t *cas)
{
if (cas == NULL) return;
if (cas->descriptors != NULL)
{
vqarray_foreach(cas->descriptors, (vqarray_functor_t)descriptor_free);
vqarray_free(cas->descriptors);
}
free(cas);
}
void mpeg2ts_stream_free(mpeg2ts_stream_t *m2s) {
if (m2s == NULL)
return;
if (m2s->programs != NULL) {
vqarray_foreach(m2s->programs, mpeg2ts_program_free);
vqarray_free(m2s->programs);
}
if (m2s->pat != NULL) {
program_association_section_free(m2s->pat);
}
free(m2s);
}
void mpeg2ts_program_free(mpeg2ts_program_t *m2p) {
if (m2p == NULL)
return;
if (m2p->pids != NULL) {
vqarray_foreach(m2p->pids, pid_info_free);
vqarray_free(m2p->pids);
}
if (m2p->pmt != NULL) {
program_map_section_free(m2p->pmt);
}
free(m2p);
}
int program_association_section_read(program_association_section_t *pas, uint8_t *buf, size_t buf_len, uint32_t payload_unit_start_indicator,
psi_table_buffer_t *patBuffer)
{
vqarray_t *programs;
int num_programs = 0;
if (pas == NULL || buf == NULL)
{
SAFE_REPORT_TS_ERR(-1);
return 0;
}
bs_t *b = NULL;
if (!payload_unit_start_indicator && patBuffer->buffer == NULL)
{
// this TS packet is not start of table, and we have no cached table data
LOG_WARN ("program_association_section_read: payload_unit_start_indicator not set and no cached data");
return 0;
}
if (payload_unit_start_indicator)
{
uint8_t payloadStartPtr = buf[0];
buf += (payloadStartPtr + 1);
buf_len -= (payloadStartPtr + 1);
LOG_DEBUG_ARGS ("program_association_section_read: payloadStartPtr = %d", payloadStartPtr);
}
// check for pat spanning multiple TS packets
if (patBuffer->buffer != NULL)
{
LOG_DEBUG_ARGS ("program_association_section_read: patBuffer detected: patBufferAllocSz = %d, patBufferUsedSz = %d",
patBuffer->bufferAllocSz, patBuffer->bufferUsedSz);
size_t numBytesToCopy = buf_len;
if (buf_len > (patBuffer->bufferAllocSz - patBuffer->bufferUsedSz))
{
numBytesToCopy = patBuffer->bufferAllocSz - patBuffer->bufferUsedSz;
}
LOG_DEBUG_ARGS ("program_association_section_read: copying %d bytes to patBuffer", numBytesToCopy);
memcpy (patBuffer->buffer + patBuffer->bufferUsedSz, buf, numBytesToCopy);
patBuffer->bufferUsedSz += numBytesToCopy;
if (patBuffer->bufferUsedSz < patBuffer->bufferAllocSz)
{
LOG_DEBUG ("program_association_section_read: patBuffer not yet full -- returning");
return 0;
}
b = bs_new(patBuffer->buffer, patBuffer->bufferUsedSz);
}
else
{
b = bs_new(buf, buf_len);
}
pas->table_id = bs_read_u8(b);
if (pas->table_id != program_association_section)
{
LOG_ERROR_ARGS("Table ID in PAT is 0x%02X instead of expected 0x%02X",
pas->table_id, program_association_section);
reportAddErrorLogArgs("Table ID in PAT is 0x%02X instead of expected 0x%02X",
pas->table_id, program_association_section);
SAFE_REPORT_TS_ERR(-30);
resetPSITableBuffer(patBuffer);
bs_free (b);
return 0;
}
// read byte 0
pas->section_syntax_indicator = bs_read_u1(b);
if (!pas->section_syntax_indicator)
{
LOG_ERROR("section_syntax_indicator not set in PAT");
reportAddErrorLog("section_syntax_indicator not set in PAT");
SAFE_REPORT_TS_ERR(-31);
resetPSITableBuffer(patBuffer);
bs_free (b);
return 0;
}
bs_skip_u(b, 3); // TODO read the zero bit, check it to be zero
pas->section_length = bs_read_u(b, 12);
if (pas->section_length > MAX_SECTION_LEN)
{
LOG_ERROR_ARGS("PAT section length is 0x%02X, larger than maximum allowed 0x%02X",
pas->section_length, MAX_SECTION_LEN);
reportAddErrorLogArgs("PAT section length is 0x%02X, larger than maximum allowed 0x%02X",
pas->section_length, MAX_SECTION_LEN);
SAFE_REPORT_TS_ERR(-32);
resetPSITableBuffer(patBuffer);
bs_free (b);
return 0;
}
if (pas->section_length > bs_bytes_left(b))
{
LOG_DEBUG ("program_association_section_read: Detected section spans more than one TS packet -- allocating buffer");
if (patBuffer->buffer != NULL)
{
// should never get here
LOG_ERROR ("program_association_section_read: unexpected patBufffer");
reportAddErrorLog ("program_association_section_read: unexpected patBufffer");
resetPSITableBuffer(patBuffer);
}
patBuffer->bufferAllocSz = pas->section_length + 3;
patBuffer->buffer = (uint8_t *)calloc (pas->section_length + 3, 1);
memcpy (patBuffer->buffer, buf, buf_len);
patBuffer->bufferUsedSz = buf_len;
bs_free (b);
return 0;
}
// read bytes 1,2
pas->transport_stream_id = bs_read_u16(b);
// read bytes 3,4
bs_skip_u(b, 2);
pas->version_number = bs_read_u(b, 5);
pas->current_next_indicator = bs_read_u1(b);
if (!pas->current_next_indicator) LOG_WARN("This PAT is not yet applicable/n");
// read byte 5
pas->section_number = bs_read_u8(b);
pas->last_section_number = bs_read_u8(b);
if (pas->section_number != 0 || pas->last_section_number != 0) LOG_WARN("Multi-section PAT is not supported yet/n");
// read bytes 6,7
num_programs = (pas->section_length - 5 - 4) / 4; // Programs listed in the PAT
// explanation: section_length gives us the length from the end of section_length
// we used 5 bytes for the mandatory section fields, and will use another 4 bytes for CRC
// the remaining bytes contain program information, which is 4 bytes per iteration
// It's much shorter in C :-)
// Read the program loop, but ignore the NIT PID "program"
programs = vqarray_new();
for (uint32_t i = 0; i < num_programs; i++)
{
program_info_t *prog = malloc(sizeof(program_info_t));
prog->program_number = bs_read_u16(b);
if (prog->program_number == 0) { // Skip the NIT PID program (not a real program)
free(prog);
bs_skip_u(b, 16);
continue;
}
bs_skip_u(b, 3);
prog->program_map_PID = bs_read_u(b, 13);
vqarray_add(programs, (vqarray_elem_t*)prog);
}
// This is our true number of programs
pas->_num_programs = vqarray_length(programs);
if (pas->_num_programs > 1) LOG_WARN_ARGS("%zd programs found, but only SPTS is fully supported. Patches are welcome.", pas->_num_programs);
// Copy form our vqarray into the native array
pas->programs = malloc(pas->_num_programs * sizeof(program_info_t));
for (uint32_t i = 0; i < pas->_num_programs; i++)
{
program_info_t* prog = (program_info_t*)vqarray_pop(programs);
pas->programs[i] = *prog;
free(prog);
}
vqarray_free(programs);
pas->CRC_32 = bs_read_u32(b);
// check CRC
crc_t pas_crc = crc_init();
pas_crc = crc_update(pas_crc, buf, bs_pos(b) - 4);
pas_crc = crc_finalize(pas_crc);
if (pas_crc != pas->CRC_32)
{
LOG_ERROR_ARGS("PAT CRC_32 specified as 0x%08X, but calculated as 0x%08X", pas->CRC_32, pas_crc);
reportAddErrorLogArgs("PAT CRC_32 specified as 0x%08X, but calculated as 0x%08X", pas->CRC_32, pas_crc);
SAFE_REPORT_TS_ERR(-33);
resetPSITableBuffer(patBuffer);
bs_free (b);
return 0;
}
else
{
// LOG_DEBUG("PAT CRC_32 checked successfully");
// don't enable unless you want to see this every ~100ms
}
bs_free(b);
resetPSITableBuffer(patBuffer);
return 1;
}
