libvpx: Pull from upstream

source/libvpx/third_party/libwebm/mkvmuxerutil.cpp

Index: source/libvpx/third_party/libwebm/mkvmuxerutil.cpp
===================================================================
--- source/libvpx/third_party/libwebm/mkvmuxerutil.cpp	(revision 0)
+++ source/libvpx/third_party/libwebm/mkvmuxerutil.cpp	(revision 0)
@@ -0,0 +1,713 @@
+// Copyright (c) 2012 The WebM project authors. All Rights Reserved.
+//
+// Use of this source code is governed by a BSD-style license
+// that can be found in the LICENSE file in the root of the source
+// tree. An additional intellectual property rights grant can be found
+// in the file PATENTS.  All contributing project authors may
+// be found in the AUTHORS file in the root of the source tree.
+
+#include "mkvmuxerutil.hpp"
+
+#ifdef __ANDROID__
+#include <fcntl.h>
+#endif
+
+#include <cassert>
+#include <cmath>
+#include <cstdio>
+#ifdef _MSC_VER
+#define _CRT_RAND_S
+#endif
+#include <cstdlib>
+#include <cstring>
+#include <ctime>
+
+#include <new>
+
+#include "mkvwriter.hpp"
+#include "webmids.hpp"
+
+namespace mkvmuxer {
+
+int32 GetCodedUIntSize(uint64 value) {
+  if (value < 0x000000000000007FULL)
+    return 1;
+  else if (value < 0x0000000000003FFFULL)
+    return 2;
+  else if (value < 0x00000000001FFFFFULL)
+    return 3;
+  else if (value < 0x000000000FFFFFFFULL)
+    return 4;
+  else if (value < 0x00000007FFFFFFFFULL)
+    return 5;
+  else if (value < 0x000003FFFFFFFFFFULL)
+    return 6;
+  else if (value < 0x0001FFFFFFFFFFFFULL)
+    return 7;
+  return 8;
+}
+
+int32 GetUIntSize(uint64 value) {
+  if (value < 0x0000000000000100ULL)
+    return 1;
+  else if (value < 0x0000000000010000ULL)
+    return 2;
+  else if (value < 0x0000000001000000ULL)
+    return 3;
+  else if (value < 0x0000000100000000ULL)
+    return 4;
+  else if (value < 0x0000010000000000ULL)
+    return 5;
+  else if (value < 0x0001000000000000ULL)
+    return 6;
+  else if (value < 0x0100000000000000ULL)
+    return 7;
+  return 8;
+}
+
+uint64 EbmlMasterElementSize(uint64 type, uint64 value) {
+  // Size of EBML ID
+  int32 ebml_size = GetUIntSize(type);
+
+  // Datasize
+  ebml_size += GetCodedUIntSize(value);
+
+  return ebml_size;
+}
+
+uint64 EbmlElementSize(uint64 type, int64 value) {
+  return EbmlElementSize(type, static_cast<uint64>(value));
+}
+
+uint64 EbmlElementSize(uint64 type, uint64 value) {
+  // Size of EBML ID
+  int32 ebml_size = GetUIntSize(type);
+
+  // Datasize
+  ebml_size += GetUIntSize(value);
+
+  // Size of Datasize
+  ebml_size++;
+
+  return ebml_size;
+}
+
+uint64 EbmlElementSize(uint64 type, float /* value */ ) {
+  // Size of EBML ID
+  uint64 ebml_size = GetUIntSize(type);
+
+  // Datasize
+  ebml_size += sizeof(float);
+
+  // Size of Datasize
+  ebml_size++;
+
+  return ebml_size;
+}
+
+uint64 EbmlElementSize(uint64 type, const char* value) {
+  if (!value)
+    return 0;
+
+  // Size of EBML ID
+  uint64 ebml_size = GetUIntSize(type);
+
+  // Datasize
+  ebml_size += strlen(value);
+
+  // Size of Datasize
+  ebml_size++;
+
+  return ebml_size;
+}
+
+uint64 EbmlElementSize(uint64 type, const uint8* value, uint64 size) {
+  if (!value)
+    return 0;
+
+  // Size of EBML ID
+  uint64 ebml_size = GetUIntSize(type);
+
+  // Datasize
+  ebml_size += size;
+
+  // Size of Datasize
+  ebml_size += GetCodedUIntSize(size);
+
+  return ebml_size;
+}
+
+int32 SerializeInt(IMkvWriter* writer, int64 value, int32 size) {
+  if (!writer || size < 1 || size > 8)
+    return -1;
+
+  for (int32 i = 1; i <= size; ++i) {
+    const int32 byte_count = size - i;
+    const int32 bit_count = byte_count * 8;
+
+    const int64 bb = value >> bit_count;
+    const uint8 b = static_cast<uint8>(bb);
+
+    const int32 status = writer->Write(&b, 1);
+
+    if (status < 0)
+      return status;
+  }
+
+  return 0;
+}
+
+int32 SerializeFloat(IMkvWriter* writer, float f) {
+  if (!writer)
+    return -1;
+
+  assert(sizeof(uint32) == sizeof(float));
+  // This union is merely used to avoid a reinterpret_cast from float& to
+  // uint32& which will result in violation of strict aliasing.
+  union U32 {
+    uint32 u32;
+    float f;
+  } value;
+  value.f = f;
+
+  for (int32 i = 1; i <= 4; ++i) {
+    const int32 byte_count = 4 - i;
+    const int32 bit_count = byte_count * 8;
+
+    const uint8 byte = static_cast<uint8>(value.u32 >> bit_count);
+
+    const int32 status = writer->Write(&byte, 1);
+
+    if (status < 0)
+      return status;
+  }
+
+  return 0;
+}
+
+int32 WriteUInt(IMkvWriter* writer, uint64 value) {
+  if (!writer)
+    return -1;
+
+  int32 size = GetCodedUIntSize(value);
+
+  return WriteUIntSize(writer, value, size);
+}
+
+int32 WriteUIntSize(IMkvWriter* writer, uint64 value, int32 size) {
+  if (!writer || size < 0 || size > 8)
+    return -1;
+
+  if (size > 0) {
+    const uint64 bit = 1LL << (size * 7);
+
+    if (value > (bit - 2))
+      return -1;
+
+    value |= bit;
+  } else {
+    size = 1;
+    int64 bit;
+
+    for (;;) {
+      bit = 1LL << (size * 7);
+      const uint64 max = bit - 2;
+
+      if (value <= max)
+        break;
+
+      ++size;
+    }
+
+    if (size > 8)
+      return false;
+
+    value |= bit;
+  }
+
+  return SerializeInt(writer, value, size);
+}
+
+int32 WriteID(IMkvWriter* writer, uint64 type) {
+  if (!writer)
+    return -1;
+
+  writer->ElementStartNotify(type, writer->Position());
+
+  const int32 size = GetUIntSize(type);
+
+  return SerializeInt(writer, type, size);
+}
+
+bool WriteEbmlMasterElement(IMkvWriter* writer, uint64 type, uint64 size) {
+  if (!writer)
+    return false;
+
+  if (WriteID(writer, type))
+    return false;
+
+  if (WriteUInt(writer, size))
+    return false;
+
+  return true;
+}
+
+bool WriteEbmlElement(IMkvWriter* writer, uint64 type, uint64 value) {
+  if (!writer)
+    return false;
+
+  if (WriteID(writer, type))
+    return false;
+
+  const uint64 size = GetUIntSize(value);
+  if (WriteUInt(writer, size))
+    return false;
+
+  if (SerializeInt(writer, value, static_cast<int32>(size)))
+    return false;
+
+  return true;
+}
+
+bool WriteEbmlElement(IMkvWriter* writer, uint64 type, float value) {
+  if (!writer)
+    return false;
+
+  if (WriteID(writer, type))
+    return false;
+
+  if (WriteUInt(writer, 4))
+    return false;
+
+  if (SerializeFloat(writer, value))
+    return false;
+
+  return true;
+}
+
+bool WriteEbmlElement(IMkvWriter* writer, uint64 type, const char* value) {
+  if (!writer || !value)
+    return false;
+
+  if (WriteID(writer, type))
+    return false;
+
+  const uint64 length = strlen(value);
+  if (WriteUInt(writer, length))
+    return false;
+
+  if (writer->Write(value, static_cast<const uint32>(length)))
+    return false;
+
+  return true;
+}
+
+bool WriteEbmlElement(IMkvWriter* writer,
+                      uint64 type,
+                      const uint8* value,
+                      uint64 size) {
+  if (!writer || !value || size < 1)
+    return false;
+
+  if (WriteID(writer, type))
+    return false;
+
+  if (WriteUInt(writer, size))
+    return false;
+
+  if (writer->Write(value, static_cast<uint32>(size)))
+    return false;
+
+  return true;
+}
+
+uint64 WriteSimpleBlock(IMkvWriter* writer,
+                        const uint8* data,
+                        uint64 length,
+                        uint64 track_number,
+                        int64 timecode,
+                        uint64 is_key) {
+  if (!writer)
+    return false;
+
+  if (!data || length < 1)
+    return false;
+
+  //  Here we only permit track number values to be no greater than
+  //  126, which the largest value we can store having a Matroska
+  //  integer representation of only 1 byte.
+
+  if (track_number < 1 || track_number > 126)
+    return false;
+
+  //  Technically the timestamp for a block can be less than the
+  //  timestamp for the cluster itself (remember that block timestamp
+  //  is a signed, 16-bit integer).  However, as a simplification we
+  //  only permit non-negative cluster-relative timestamps for blocks.
+
+  if (timecode < 0 || timecode > kMaxBlockTimecode)
+    return false;
+
+  if (WriteID(writer, kMkvSimpleBlock))
+    return 0;
+
+  const int32 size = static_cast<int32>(length) + 4;
+  if (WriteUInt(writer, size))
+    return 0;
+
+  if (WriteUInt(writer, static_cast<uint64>(track_number)))
+    return 0;
+
+  if (SerializeInt(writer, timecode, 2))
+    return 0;
+
+  uint64 flags = 0;
+  if (is_key)
+    flags |= 0x80;
+
+  if (SerializeInt(writer, flags, 1))
+    return 0;
+
+  if (writer->Write(data, static_cast<uint32>(length)))
+    return 0;
+
+  const uint64 element_size =
+    GetUIntSize(kMkvSimpleBlock) + GetCodedUIntSize(size) + 4 + length;
+
+  return element_size;
+}
+
+// We must write the metadata (key)frame as a BlockGroup element,
+// because we need to specify a duration for the frame.  The
+// BlockGroup element comprises the frame itself and its duration,
+// and is laid out as follows:
+//
+//   BlockGroup tag
+//   BlockGroup size
+//     Block tag
+//     Block size
+//     (the frame is the block payload)
+//     Duration tag
+//     Duration size
+//     (duration payload)
+//
+uint64 WriteMetadataBlock(IMkvWriter* writer,
+                          const uint8* data,
+                          uint64 length,
+                          uint64 track_number,
+                          int64 timecode,
+                          uint64 duration) {
+  // We don't backtrack when writing to the stream, so we must
+  // pre-compute the BlockGroup size, by summing the sizes of each
+  // sub-element (the block and the duration).
+
+  // We use a single byte for the track number of the block, which
+  // means the block header is exactly 4 bytes.
+
+  // TODO(matthewjheaney): use EbmlMasterElementSize and WriteEbmlMasterElement
+
+  const uint64 block_payload_size = 4 + length;
+  const int32 block_size = GetCodedUIntSize(block_payload_size);
+  const uint64 block_elem_size = 1 + block_size + block_payload_size;
+
+  const int32 duration_payload_size = GetUIntSize(duration);
+  const int32 duration_size = GetCodedUIntSize(duration_payload_size);
+  const uint64 duration_elem_size = 1 + duration_size + duration_payload_size;
+
+  const uint64 blockg_payload_size = block_elem_size + duration_elem_size;
+  const int32 blockg_size = GetCodedUIntSize(blockg_payload_size);
+  const uint64 blockg_elem_size = 1 + blockg_size + blockg_payload_size;
+
+  if (WriteID(writer, kMkvBlockGroup))  // 1-byte ID size
+    return 0;
+
+  if (WriteUInt(writer, blockg_payload_size))
+    return 0;
+
+  //  Write Block element
+
+  if (WriteID(writer, kMkvBlock))  // 1-byte ID size
+    return 0;
+
+  if (WriteUInt(writer, block_payload_size))
+    return 0;
+
+  // Byte 1 of 4
+
+  if (WriteUInt(writer, track_number))
+    return 0;
+
+  // Bytes 2 & 3 of 4
+
+  if (SerializeInt(writer, timecode, 2))
+    return 0;
+
+  // Byte 4 of 4
+
+  const uint64 flags = 0;
+
+  if (SerializeInt(writer, flags, 1))
+    return 0;
+
+  // Now write the actual frame (of metadata)
+
+  if (writer->Write(data, static_cast<uint32>(length)))
+    return 0;
+
+  // Write Duration element
+
+  if (WriteID(writer, kMkvBlockDuration))  // 1-byte ID size
+    return 0;
+
+  if (WriteUInt(writer, duration_payload_size))
+    return 0;
+
+  if (SerializeInt(writer, duration, duration_payload_size))
+    return 0;
+
+  // Note that we don't write a reference time as part of the block
+  // group; no reference time(s) indicates that this block is a
+  // keyframe.  (Unlike the case for a SimpleBlock element, the header
+  // bits of the Block sub-element of a BlockGroup element do not
+  // indicate keyframe status.  The keyframe status is inferred from
+  // the absence of reference time sub-elements.)
+
+  return blockg_elem_size;
+}
+
+// Writes a WebM BlockGroup with BlockAdditional data. The structure is as
+// follows:
+// Indentation shows sub-levels
+// BlockGroup
+//  Block
+//    Data
+//  BlockAdditions
+//    BlockMore
+//      BlockAddID
+//        1 (Denotes Alpha)
+//      BlockAdditional
+//        Data
+uint64 WriteBlockWithAdditional(IMkvWriter* writer,
+                                const uint8* data,
+                                uint64 length,
+                                const uint8* additional,
+                                uint64 additional_length,
+                                uint64 add_id,
+                                uint64 track_number,
+                                int64 timecode,
+                                uint64 is_key) {
+  if (!data || !additional || length < 1 || additional_length < 1)
+    return 0;
+
+  const uint64 block_payload_size = 4 + length;
+  const uint64 block_elem_size = EbmlMasterElementSize(kMkvBlock,
+                                                       block_payload_size) +
+                                 block_payload_size;
+  const uint64 block_additional_elem_size = EbmlElementSize(kMkvBlockAdditional,
+                                                            additional,
+                                                            additional_length);
+  const uint64 block_addid_elem_size = EbmlElementSize(kMkvBlockAddID, add_id);
+
+  const uint64 block_more_payload_size = block_addid_elem_size +
+                                         block_additional_elem_size;
+  const uint64 block_more_elem_size = EbmlMasterElementSize(
+                                          kMkvBlockMore,
+                                          block_more_payload_size) +
+                                      block_more_payload_size;
+  const uint64 block_additions_payload_size = block_more_elem_size;
+  const uint64 block_additions_elem_size = EbmlMasterElementSize(
+                                               kMkvBlockAdditions,
+                                               block_additions_payload_size) +
+                                           block_additions_payload_size;
+  const uint64 block_group_payload_size = block_elem_size +
+                                          block_additions_elem_size;
+  const uint64 block_group_elem_size = EbmlMasterElementSize(
+                                           kMkvBlockGroup,
+                                           block_group_payload_size) +
+                                       block_group_payload_size;
+
+  if (!WriteEbmlMasterElement(writer, kMkvBlockGroup,
+                              block_group_payload_size))
+    return 0;
+
+  if (!WriteEbmlMasterElement(writer, kMkvBlock, block_payload_size))
+    return 0;
+
+  if (WriteUInt(writer, track_number))
+    return 0;
+
+  if (SerializeInt(writer, timecode, 2))
+    return 0;
+
+  uint64 flags = 0;
+  if (is_key)
+    flags |= 0x80;
+  if (SerializeInt(writer, flags, 1))
+    return 0;
+
+  if (writer->Write(data, static_cast<uint32>(length)))
+    return 0;
+
+  if (!WriteEbmlMasterElement(writer, kMkvBlockAdditions,
+                              block_additions_payload_size))
+    return 0;
+
+  if (!WriteEbmlMasterElement(writer, kMkvBlockMore, block_more_payload_size))
+    return 0;
+
+  if (!WriteEbmlElement(writer, kMkvBlockAddID, add_id))
+    return 0;
+
+  if (!WriteEbmlElement(writer, kMkvBlockAdditional,
+                        additional, additional_length))
+    return 0;
+
+  return block_group_elem_size;
+}
+
+// Writes a WebM BlockGroup with DiscardPadding. The structure is as follows:
+// Indentation shows sub-levels
+// BlockGroup
+//  Block
+//    Data
+//  DiscardPadding
+uint64 WriteBlockWithDiscardPadding(IMkvWriter* writer,
+                                    const uint8* data,
+                                    uint64 length,
+                                    int64 discard_padding,
+                                    uint64 track_number,
+                                    int64 timecode,
+                                    uint64 is_key) {
+  if (!data || length < 1 || discard_padding <= 0)
+    return 0;
+
+  const uint64 block_payload_size = 4 + length;
+  const uint64 block_elem_size = EbmlMasterElementSize(kMkvBlock,
+                                                       block_payload_size) +
+                                 block_payload_size;
+  const uint64 discard_padding_elem_size = EbmlElementSize(kMkvDiscardPadding,
+                                                           discard_padding);
+  const uint64 block_group_payload_size = block_elem_size +
+                                          discard_padding_elem_size;
+  const uint64 block_group_elem_size = EbmlMasterElementSize(
+                                           kMkvBlockGroup,
+                                           block_group_payload_size) +
+                                       block_group_payload_size;
+
+  if (!WriteEbmlMasterElement(writer, kMkvBlockGroup,
+                              block_group_payload_size))
+    return 0;
+
+  if (!WriteEbmlMasterElement(writer, kMkvBlock, block_payload_size))
+    return 0;
+
+  if (WriteUInt(writer, track_number))
+    return 0;
+
+  if (SerializeInt(writer, timecode, 2))
+    return 0;
+
+  uint64 flags = 0;
+  if (is_key)
+    flags |= 0x80;
+  if (SerializeInt(writer, flags, 1))
+    return 0;
+
+  if (writer->Write(data, static_cast<uint32>(length)))
+    return 0;
+
+  if (WriteID(writer, kMkvDiscardPadding))
+    return 0;
+
+  const uint64 size = GetUIntSize(discard_padding);
+  if (WriteUInt(writer, size))
+    return false;
+
+  if (SerializeInt(writer, discard_padding, static_cast<int32>(size)))
+    return false;
+
+  return block_group_elem_size;
+}
+
+uint64 WriteVoidElement(IMkvWriter* writer, uint64 size) {
+  if (!writer)
+    return false;
+
+  // Subtract one for the void ID and the coded size.
+  uint64 void_entry_size = size - 1 - GetCodedUIntSize(size-1);
+  uint64 void_size = EbmlMasterElementSize(kMkvVoid, void_entry_size) +
+                     void_entry_size;
+
+  if (void_size != size)
+    return 0;
+
+  const int64 payload_position = writer->Position();
+  if (payload_position < 0)
+    return 0;
+
+  if (WriteID(writer, kMkvVoid))
+    return 0;
+
+  if (WriteUInt(writer, void_entry_size))
+    return 0;
+
+  const uint8 value = 0;
+  for (int32 i = 0; i < static_cast<int32>(void_entry_size); ++i) {
+    if (writer->Write(&value, 1))
+      return 0;
+  }
+
+  const int64 stop_position = writer->Position();
+  if (stop_position < 0 ||
+      stop_position - payload_position != static_cast<int64>(void_size))
+    return 0;
+
+  return void_size;
+}
+
+void GetVersion(int32* major, int32* minor, int32* build, int32* revision) {
+  *major = 0;
+  *minor = 2;
+  *build = 1;
+  *revision = 0;
+}
+
+}  // namespace mkvmuxer
+
+mkvmuxer::uint64 mkvmuxer::MakeUID(unsigned int* seed) {
+  uint64 uid = 0;
+
+#ifdef __MINGW32__
+  srand(*seed);
+#endif
+
+  for (int i = 0; i < 7; ++i) {  // avoid problems with 8-byte values
+    uid <<= 8;
+
+    // TODO(fgalligan): Move random number generation to platform specific code.
+#ifdef _MSC_VER
+    (void)seed;
+    unsigned int random_value;
+    const errno_t e = rand_s(&random_value);
+    (void)e;
+    const int32 nn  = random_value;
+#elif __ANDROID__
+    int32 temp_num = 1;
+    int fd = open("/dev/urandom", O_RDONLY);
+    if (fd != -1) {
+      read(fd, &temp_num, sizeof(int32));
+      close(fd);
+    }
+    const int32 nn = temp_num;
+#elif defined __MINGW32__
+    const int32 nn = rand();
+#else
+    const int32 nn = rand_r(seed);
+#endif
+    const int32 n = 0xFF & (nn >> 4);  // throw away low-order bits
+
+    uid |= n;
+  }
+
+  return uid;
+}