Increase decoding chunk size for much better performance.

[pulseview.git] / pv / data / decoderstack.cpp

diff --git a/pv/data/decoderstack.cpp b/pv/data/decoderstack.cpp
index d4daa5902a1d2a47d9f727da8dda74c5c6f5ef9c..c216d8d2627344264d940e4ab7a8d1a3db26c6d5 100644 (file)
--- a/pv/data/decoderstack.cpp
+++ b/pv/data/decoderstack.cpp
@@ -14,8 +14,7 @@
  * 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 St, Fifth Floor, Boston, MA  02110-1301 USA
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
  */
 
 #include <libsigrokdecode/libsigrokdecode.h>
@@ -54,7 +53,7 @@ namespace data {
 
 const double DecoderStack::DecodeMargin = 1.0;
 const double DecoderStack::DecodeThreshold = 0.2;
-const int64_t DecoderStack::DecodeChunkLength = 4096;
+const int64_t DecoderStack::DecodeChunkLength = 10 * 1024 * 1024;
 const unsigned int DecoderStack::DecodeNotifyPeriod = 1024;
 
 mutex DecoderStack::global_srd_mutex_;
@@ -191,9 +190,6 @@ void DecoderStack::clear()
 
 void DecoderStack::begin_decode()
 {
-       shared_ptr<pv::view::LogicSignal> logic_signal;
-       shared_ptr<pv::data::Logic> data;
-
        if (decode_thread_.joinable()) {
                interrupt_ = true;
                input_cond_.notify_one();
@@ -241,11 +237,14 @@ void DecoderStack::begin_decode()
 
        // We get the logic data of the first channel in the list.
        // This works because we are currently assuming all
-       // LogicSignals have the same data/segment
+       // logic signals have the same data/segment
+       pv::data::SignalBase *signalbase;
+       pv::data::Logic *data = nullptr;
+
        for (const shared_ptr<decode::Decoder> &dec : stack_)
                if (dec && !dec->channels().empty() &&
-                       ((logic_signal = (*dec->channels().begin()).second)) &&
-                       ((data = logic_signal->logic_data())))
+                       ((signalbase = (*dec->channels().begin()).second.get())) &&
+                       ((data = signalbase->logic_data().get())))
                        break;
 
        if (!data)
@@ -302,20 +301,18 @@ optional<int64_t> DecoderStack::wait_for_data() const
 }
 
 void DecoderStack::decode_data(
-       const int64_t sample_count, const unsigned int unit_size,
+       const int64_t abs_start_samplenum, const int64_t sample_count, const unsigned int unit_size,
        srd_session *const session)
 {
-       uint8_t chunk[DecodeChunkLength];
-
        const unsigned int chunk_sample_count =
                DecodeChunkLength / segment_->unit_size();
 
-       for (int64_t i = 0; !interrupt_ && i < sample_count;
+       for (int64_t i = abs_start_samplenum; !interrupt_ && i < sample_count;
                        i += chunk_sample_count) {
 
                const int64_t chunk_end = min(
                        i + chunk_sample_count, sample_count);
-               segment_->get_samples(chunk, i, chunk_end);
+               const uint8_t* chunk = segment_->get_samples(i, chunk_end);
 
                if (srd_session_send(session, i, chunk_end, chunk,
                                (chunk_end - i) * unit_size, unit_size) != SRD_OK) {
@@ -383,8 +380,10 @@ void DecoderStack::decode_proc()
 
        srd_session_start(session);
 
+       int64_t abs_start_samplenum = 0;
        do {
-               decode_data(*sample_count, unit_size, session);
+               decode_data(abs_start_samplenum, *sample_count, unit_size, session);
+               abs_start_samplenum = *sample_count;
        } while (error_message_.isEmpty() && (sample_count = wait_for_data()));
 
        // Destroy the session