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tsstreamdevice.cpp
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tsstreamdevice.cpp
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#include "tsstreamdevice.h"
TSStreamDevice::TSStreamDevice(ts_parse_context* tpc, QList<bool> &ts_packet_select, QString& filename, QObject *parent)
: QIODevice(parent)
{
this->tpc = tpc;
this->ts_packet_select.clear();
this->ts_packet_select.append(ts_packet_select);
this->filename = filename;
cur_ts_index = 0;
cur_ts_buf_index = 0;
}
TSStreamDevice::~TSStreamDevice() {
if (file_handle.isOpen()) {
file_handle.close();
}
}
bool TSStreamDevice::isOpen() const {
return file_handle.isOpen();
}
bool TSStreamDevice::isReadable() const {
return file_handle.isOpen();
}
bool TSStreamDevice::isWritable() const {
return false;
}
bool TSStreamDevice::isSequential() const {
return true;
}
qint64 TSStreamDevice::readData(char *data, qint64 maxlen) {
int bytes_copied = 0;
int64_t file_pos;
int read_len;
int ts_packet_remain;
if (tpc == NULL) {
return -1;
}
if (cur_ts_index >= tpc->nb_ts_packets) {
return 0;
}
if (!file_handle.isOpen()) {
return -1;
}
while (bytes_copied < maxlen) {
if (cur_ts_index >= tpc->nb_ts_packets) {
return 0;
}
if (!ts_packet_select[cur_ts_index]) {
cur_ts_index++;
continue;
}
ts_packet_remain = TS_PACKET_LEN - cur_ts_buf_index;
if (maxlen - bytes_copied < ts_packet_remain) {
read_len = maxlen - bytes_copied;
} else {
read_len = ts_packet_remain;
}
file_pos = tpc->ts_packets[cur_ts_index]->start_pos + cur_ts_buf_index;
file_handle.seek(file_pos);
file_handle.read((char*)data + bytes_copied, read_len);
bytes_copied += read_len;
if (read_len < TS_PACKET_LEN) {
cur_ts_buf_index += read_len;
if (cur_ts_buf_index == TS_PACKET_LEN) {
cur_ts_buf_index = 0;
cur_ts_index ++;
}
} else {
cur_ts_index ++;
}
}
if (cur_ts_index < tpc->nb_ts_packets) {
if (tpc->ts_packets[cur_ts_index]->pes_packet) {
emit update_stream_info(cur_ts_index, tpc->ts_packets[cur_ts_index]->pes_packet->index);
}
}
return bytes_copied;
}
bool TSStreamDevice::open(OpenMode mode) {
if (mode != ReadOnly) {
return false;
}
cur_ts_index = 0;
cur_ts_buf_index = 0;
file_handle.setFileName(filename);
if (file_handle.open(mode)) {
QIODevice::open(mode);
return true;
}
return false;
}
void TSStreamDevice::close() {
file_handle.close();
cur_ts_index = 0;
cur_ts_buf_index = 0;
}
qint64 TSStreamDevice::writeData(const char*, qint64) {
return -1;
}