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Add an option to allow write |mvex| before |trak| 

Under command line flag --mvex_before_trak.

This is needed to workaround Android MediaExtractor bug which
requires |mvex| to appear before |trak|.

Closes #711.

Change-Id: Id41d71af5c0016f59023dda6408bbf502e12ac55
This commit is contained in:
KongQun Yang 2020-02-09 23:25:17 -08:00
parent 4028bf727b
commit 055c67888b
1 changed files with 15 additions and 1 deletions
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14
packager/media/formats/mp4/box_definitions.cc
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@ -4,6 +4,7 @@
#include "packager/media/formats/mp4/box_definitions.h" #include "packager/media/formats/mp4/box_definitions.h"
#include <gflags/gflags.h>
#include <limits> #include <limits>
#include "packager/base/logging.h" #include "packager/base/logging.h"
@ -12,6 +13,11 @@
#include "packager/media/base/rcheck.h" #include "packager/media/base/rcheck.h"
#include "packager/media/formats/mp4/box_buffer.h" #include "packager/media/formats/mp4/box_buffer.h"
DEFINE_bool(mvex_before_trak,
false,
"Android MediaExtractor requires mvex to be written before trak. "
"Set the flag to true to comply with the requirement.");
namespace { namespace {
const uint32_t kFourCCSize = 4; const uint32_t kFourCCSize = 4;
@ -2328,9 +2334,17 @@ bool Movie::ReadWriteInternal(BoxBuffer* buffer) {
// We do not care the content of metadata box in the source content, so just // We do not care the content of metadata box in the source content, so just
// skip reading the box. // skip reading the box.
RCHECK(buffer->TryReadWriteChild(&metadata)); RCHECK(buffer->TryReadWriteChild(&metadata));
if (FLAGS_mvex_before_trak) {
// |extends| has to be written before |tracks| to workaround Android
// MediaExtractor bug which requires |mvex| to be placed before |trak|.
// See https://github.com/google/shaka-packager/issues/711 for details.
RCHECK(buffer->TryReadWriteChild(&extends));
}
for (uint32_t i = 0; i < tracks.size(); ++i) for (uint32_t i = 0; i < tracks.size(); ++i)
RCHECK(buffer->ReadWriteChild(&tracks[i])); RCHECK(buffer->ReadWriteChild(&tracks[i]));
if (!FLAGS_mvex_before_trak) {
RCHECK(buffer->TryReadWriteChild(&extends)); RCHECK(buffer->TryReadWriteChild(&extends));
}
for (uint32_t i = 0; i < pssh.size(); ++i) for (uint32_t i = 0; i < pssh.size(); ++i)
RCHECK(buffer->ReadWriteChild(&pssh[i])); RCHECK(buffer->ReadWriteChild(&pssh[i]));
} }