Index: media/formats/mp2t/ts_section_cat.cc |
diff --git a/media/formats/mp2t/ts_section_cat.cc b/media/formats/mp2t/ts_section_cat.cc |
new file mode 100644 |
index 0000000000000000000000000000000000000000..0f491fb125298a075aac1044744c7510d17f5855 |
--- /dev/null |
+++ b/media/formats/mp2t/ts_section_cat.cc |
@@ -0,0 +1,85 @@ |
+// Copyright 2015 The Chromium Authors. All rights reserved. |
+// Use of this source code is governed by a BSD-style license that can be |
+// found in the LICENSE file. |
+ |
+#include "media/formats/mp2t/ts_section_cat.h" |
+ |
+#include <vector> |
+ |
+#include "base/logging.h" |
+#include "media/base/bit_reader.h" |
+#include "media/formats/mp2t/descriptors.h" |
+#include "media/formats/mp2t/mp2t_common.h" |
+ |
+namespace media { |
+namespace mp2t { |
+ |
+TsSectionCat::TsSectionCat(const RegisterCencPidsCb& register_cenc_ids_cb) |
+ : register_cenc_ids_cb_(register_cenc_ids_cb), version_number_(-1) {} |
+ |
+TsSectionCat::~TsSectionCat() {} |
+ |
+bool TsSectionCat::ParsePsiSection(BitReader* bit_reader) { |
+ DCHECK(bit_reader); |
+ // Read the fixed section length. |
+ int table_id; |
+ int section_syntax_indicator; |
+ int dummy_zero; |
+ int reserved; |
+ int section_length; |
+ int version_number; |
+ int current_next_indicator; |
+ int section_number; |
+ int last_section_number; |
+ RCHECK(bit_reader->ReadBits(8, &table_id)); |
+ RCHECK(bit_reader->ReadBits(1, §ion_syntax_indicator)); |
+ RCHECK(bit_reader->ReadBits(1, &dummy_zero)); |
+ RCHECK(bit_reader->ReadBits(2, &reserved)); |
+ RCHECK(bit_reader->ReadBits(12, §ion_length)); |
+ RCHECK(section_length >= 5); |
+ RCHECK(section_length <= 1021); |
+ RCHECK(bit_reader->ReadBits(18, &reserved)); |
+ RCHECK(bit_reader->ReadBits(5, &version_number)); |
+ RCHECK(bit_reader->ReadBits(1, ¤t_next_indicator)); |
+ RCHECK(bit_reader->ReadBits(8, §ion_number)); |
+ RCHECK(bit_reader->ReadBits(8, &last_section_number)); |
+ section_length -= 5; |
+ |
+ // Perform a few more verifications, including: |
+ // - Table ID should be 1 for a CAT. |
+ // - section_syntax_indicator should be one. |
+ RCHECK(table_id == 0x1); |
+ RCHECK(section_syntax_indicator); |
+ RCHECK(!dummy_zero); |
+ |
+ Descriptors descriptors; |
+ int ca_pid, pssh_pid; |
+ RCHECK(descriptors.Read(bit_reader, section_length - 4)); |
+ RCHECK(descriptors.HasCADescriptorCenc(&ca_pid, &pssh_pid)); |
+ int crc32; |
+ RCHECK(bit_reader->ReadBits(32, &crc32)); |
+ |
+ // Just ignore the CAT if not applicable yet. |
+ if (!current_next_indicator) { |
+ DVLOG(1) << "Not supported: received a CAT not applicable yet"; |
+ return true; |
+ } |
+ |
+ // Ignore the CAT if it hasn't changed. |
+ if (version_number == version_number_) |
+ return true; |
+ |
+ // Can now register the PIDs. |
+ register_cenc_ids_cb_.Run(ca_pid, pssh_pid); |
+ |
+ version_number_ = version_number; |
+ |
+ return true; |
+} |
+ |
+void TsSectionCat::ResetPsiSection() { |
+ version_number_ = -1; |
+} |
+ |
+} // namespace mp2t |
+} // namespace media |