fix mp4 stts box bug.

trunk/src/kernel/srs_kernel_mp4.cpp

@@ -3962,52 +3962,12 @@
 SrsMp4DecodingTime2SampleBox::SrsMp4DecodingTime2SampleBox()
 {
     type = SrsMp4BoxTypeSTTS;
-
-    index = count = 0;
 }
 
 SrsMp4DecodingTime2SampleBox::~SrsMp4DecodingTime2SampleBox()
 {
 }
 
-srs_error_t SrsMp4DecodingTime2SampleBox::initialize_counter()
-{
-    srs_error_t err = srs_success;
-
-    // If only sps/pps and no frames, there is no stts entries.
-    if (entries.empty()) {
-        return err;
-    }
-
-    index = 0;
-    if (index >= entries.size()) {
-        return srs_error_new(ERROR_MP4_ILLEGAL_TIMESTAMP, "illegal ts, empty stts");
-    }
-
-    count = entries[0].sample_count;
-
-    return err;
-}
-
-srs_error_t SrsMp4DecodingTime2SampleBox::on_sample(uint32_t sample_index, SrsMp4SttsEntry** ppentry)
-{
-    srs_error_t err = srs_success;
-
-    if (sample_index + 1 > count) {
-        index++;
-
-        if (index >= entries.size()) {
-            return srs_error_new(ERROR_MP4_ILLEGAL_TIMESTAMP, "illegal ts, stts overflow, count=%zd", entries.size());
-        }
-
-        count += entries[index].sample_count;
-    }
-
-    *ppentry = &entries[index];
-
-    return err;
-}
-
 int SrsMp4DecodingTime2SampleBox::nb_header()
 {
     return SrsMp4FullBox::nb_header() + 4 + 8*(int)entries.size();
@@ -5062,21 +5022,15 @@
         if (sample->frame_type == SrsVideoAvcFrameTypeKeyFrame) {
             stss_entries.push_back(sample->index + 1);
         }
-
-        if (stts) {
-            if (previous) {
-                uint32_t delta = (uint32_t)(sample->dts - previous->dts);
-                if (stts_entry.sample_delta == 0 || stts_entry.sample_delta == delta) {
-                    stts_entry.sample_delta = delta;
-                    stts_entry.sample_count++;
-                } else {
-                    stts_entries.push_back(stts_entry);
-                    stts_entry.sample_count = 1;
-                    stts_entry.sample_delta = delta;
-                }
-            } else {
-                // The first sample always in the STTS table.
-                stts_entry.sample_count++;
+
+        if (stts && previous) {
+            if (sample->dts >= previous->dts && previous->nb_samples > 0) {
+                uint32_t delta = (uint32_t)(sample->dts - previous->dts) / previous->nb_samples;
+                stts_entry.sample_count = previous->nb_samples;
+                // calcaulate delta in the time-scale of the media.
+                // moov->mvhd->timescale which is hardcoded to 1000, sample->tbn also being hardcoded to 1000.
+                stts_entry.sample_delta = delta * previous->tbn / 1000;
+                stts_entries.push_back(stts_entry);
             }
         }
 
@@ -5097,7 +5051,10 @@
         previous = sample;
     }
 
-    if (stts && stts_entry.sample_count) {
+    if (stts && previous && previous->nb_samples > 0) {
+        stts_entry.sample_count = previous->nb_samples;
+        // Can't calculate last sample duration, so set sample_delta to 1.
+        stts_entry.sample_delta = 1;
         stts_entries.push_back(stts_entry);
     }
 
@@ -5216,11 +5173,6 @@
     // Samples per chunk.
     stsc->initialize_counter();
 
-    // DTS box.
-    if ((err = stts->initialize_counter()) != srs_success) {
-        return srs_error_wrap(err, "stts init counter");
-    }
-
     // CTS/PTS box.
     if (ctts && (err = ctts->initialize_counter()) != srs_success) {
         return srs_error_wrap(err, "ctts init counter");
@@ -5249,13 +5201,14 @@
             }
             sample_relative_offset += sample_size;
 
-            SrsMp4SttsEntry* stts_entry = NULL;
-            if ((err = stts->on_sample(sample->index, &stts_entry)) != srs_success) {
-                srs_freep(sample);
-                return srs_error_wrap(err, "stts on sample");
-            }
             if (previous) {
-                sample->pts = sample->dts = previous->dts + stts_entry->sample_delta;
+                uint32_t stts_index = sample->index - 1;
+                if (stts_index >= 0 && stts_index < stts->entries.size()) {
+                    SrsMp4SttsEntry* stts_entry = &stts->entries[stts_index];
+                    sample->pts = sample->dts = previous->dts + stts_entry->sample_count * stts_entry->sample_delta;
+                } else {
+                    sample->pts = sample->dts = previous->dts;
+                }
             }
 
             SrsMp4CttsEntry* ctts_entry = NULL;
@@ -5828,10 +5781,12 @@
         ps->type = SrsFrameTypeVideo;
         ps->frame_type = (SrsVideoAvcFrameType)ft;
         ps->index = nb_videos++;
+        ps->nb_samples = format->video->nb_samples;
         vduration = dts;
     } else if (ht == SrsMp4HandlerTypeSOUN) {
         ps->type = SrsFrameTypeAudio;
         ps->index = nb_audios++;
+        ps->nb_samples = format->audio->nb_samples;
         aduration = dts;
     } else {
         srs_freep(ps);

trunk/src/kernel/srs_kernel_mp4.hpp

@@ -1554,7 +1554,7 @@ class SrsMp4SampleDescriptionBox : public SrsMp4FullBox
 };
 
 // 8.6.1.2 Decoding Time to Sample Box (stts), for Audio/Video.
-// ISO_IEC_14496-12-base-format-2012.pdf, page 48
+// ISO_IEC_14496-12-base-format-2012.pdf, page 36
 class SrsMp4SttsEntry
 {
 public:
@@ -1581,18 +1581,10 @@ class SrsMp4DecodingTime2SampleBox : public SrsMp4FullBox
 public:
     // An integer that gives the number of entries in the following table.
     std::vector<SrsMp4SttsEntry> entries;
-private:
-    // The index for counter to calc the dts for samples.
-    uint32_t index;
-    uint32_t count;
+
 public:
     SrsMp4DecodingTime2SampleBox();
     virtual ~SrsMp4DecodingTime2SampleBox();
-public:
-    // Initialize the counter.
-    virtual srs_error_t initialize_counter();
-    // When got an sample, index starts from 0.
-    virtual srs_error_t on_sample(uint32_t sample_index, SrsMp4SttsEntry** ppentry);
 protected:
     virtual int nb_header();
     virtual srs_error_t encode_header(SrsBuffer* buf);
@@ -1893,6 +1885,9 @@ class SrsMp4Sample
     // The sample data.
     uint32_t nb_data;
     uint8_t* data;
+    // number of nalu|audio-frames in this sample.
+    uint32_t nb_samples;
+
 public:
     SrsMp4Sample();
     virtual ~SrsMp4Sample();