Merge "Expose average video frame rate via MPEG4Extractor" into honeycomb

            // have a 4 byte header (0x00 0x00 0x00 0x01) after conversion,

            // and thus will grow by 2 bytes per fragment.

            mLastTrack->meta->setInt32(kKeyMaxInputSize, max_size + 10 * 2);

            *offset += chunk_size;

            // Calculate average frame rate.

            const char *mime;

            CHECK(mLastTrack->meta->findCString(kKeyMIMEType, &mime));

            if (!strncasecmp("video/", mime, 6)) {

                size_t nSamples = mLastTrack->sampleTable->countSamples();

                int64_t durationUs;

                if (mLastTrack->meta->findInt64(kKeyDuration, &durationUs)) {

                    if (durationUs > 0) {

                        int32_t frameRate = (nSamples * 1000000LL +

                                    (durationUs >> 1)) / durationUs;

                        mLastTrack->meta->setInt32(kKeyFrameRate, frameRate);

                    }

                }

            }

            break;

        }