commit 1a32f22087dafa68a23b2fef1826aaa0cf3176a0
author Wan-Teh Chang <wtc@google.com> Thu Jul 09 15:44:25 2020 -0700
committer Joe Drago <joedrago@gmail.com> Thu Jul 09 16:02:04 2020 -0700
tree e6146e9945e7d4db3ae32e8171c60ce2476c15fd
parent 6452c67aa40844d88bc37bfccd30af82cb9e413e

Set compressorname to "\012AOM Coding"

It is recommended by
https://aomediacodec.github.io/av1-isobmff/#av1sampleentry-semantics.

Also change s.offset to the equivalent avifRWStreamOffset(&s).

src/write.c

diff --git a/src/write.c b/src/write.c
index fce0b13..b21b55b 100644
--- a/src/write.c
+++ b/src/write.c
@@ -915,7 +915,8 @@
             avifRWStreamWriteU32(&s, 0x00480000);                      // template unsigned int(32) vertresolution
             avifRWStreamWriteU32(&s, 0);                               // const unsigned int(32) reserved = 0;
             avifRWStreamWriteU16(&s, 1);                               // template unsigned int(16) frame_count = 1;
-            avifRWStreamWriteZeros(&s, 32);                            // string[32] compressorname;
+            avifRWStreamWriteChars(&s, "\012AOM Coding", 11);          // string[32] compressorname;
+            avifRWStreamWriteZeros(&s, 32 - 11);                       //
             avifRWStreamWriteU16(&s, 0x0018);                          // template unsigned int(16) depth = 0x0018;
             avifRWStreamWriteU16(&s, (uint16_t)0xffff);                // int(16) pre_defined = -1;
             writeConfigBox(&s, &item->codec->configBox);
@@ -948,7 +949,7 @@
             continue;
         }
 
-        uint32_t chunkOffset = (uint32_t)s.offset;
+        uint32_t chunkOffset = (uint32_t)avifRWStreamOffset(&s);
         if (item->encodeOutput->samples.count > 0) {
             for (uint32_t sampleIndex = 0; sampleIndex < item->encodeOutput->samples.count; ++sampleIndex) {
                 avifEncodeSample * sample = &item->encodeOutput->samples.sample[sampleIndex];