/*----------------------------------------------------------------------
| AP4_CbcStreamCipher::SetIV
+---------------------------------------------------------------------*/
AP4_Result
AP4_CbcStreamCipher::SetIV(const AP4_UI08* iv)
{
AP4_CopyMemory(m_Iv, iv, AP4_CIPHER_BLOCK_SIZE);
m_StreamOffset = 0;
m_Eos = false;
AP4_CopyMemory(m_ChainBlock, m_Iv, AP4_CIPHER_BLOCK_SIZE);
m_ChainBlockFullness = AP4_CIPHER_BLOCK_SIZE;
m_InBlockFullness = 0;
m_OutputSkip = 0;
return AP4_SUCCESS;
}
/*----------------------------------------------------------------------
| AP4_OmaDcfCtrSampleEncrypter::EncryptSampleData
+---------------------------------------------------------------------*/
AP4_Result
AP4_OmaDcfCtrSampleEncrypter::EncryptSampleData(AP4_DataBuffer& data_in,
AP4_DataBuffer& data_out,
AP4_UI64 counter,
bool /*skip_encryption*/)
{
// setup the buffers
const unsigned char* in = data_in.GetData();
AP4_CHECK(data_out.SetDataSize(data_in.GetDataSize()+AP4_CIPHER_BLOCK_SIZE+1));
unsigned char* out = data_out.UseData();
// selective encryption flag
*out++ = 0x80;
// IV on 16 bytes: [SSSSSSSSXXXXXXXX]
// where SSSSSSSS is the 64-bit salt and
// XXXXXXXX is the 64-bit base counter
AP4_CopyMemory(out, m_Salt, 8);
AP4_BytesFromUInt64BE(&out[8], counter);
// encrypt the payload
AP4_Size data_size = data_in.GetDataSize();
m_Cipher->SetIV(out);
m_Cipher->ProcessBuffer(in, data_size, out+AP4_CIPHER_BLOCK_SIZE);
return AP4_SUCCESS;
}
/*----------------------------------------------------------------------
| AP4_OmaDcfCbcSampleEncrypter::EncryptSampleData
+---------------------------------------------------------------------*/
AP4_Result
AP4_OmaDcfCbcSampleEncrypter::EncryptSampleData(AP4_DataBuffer& data_in,
AP4_DataBuffer& data_out,
AP4_UI64 counter,
bool /*skip_encryption*/)
{
// make sure there is enough space in the output buffer
data_out.Reserve(data_in.GetDataSize()+2*AP4_CIPHER_BLOCK_SIZE+1);
// setup the buffers
AP4_Size out_size = data_in.GetDataSize()+AP4_CIPHER_BLOCK_SIZE;
unsigned char* out = data_out.UseData();
// selective encryption flag
*out++ = 0x80;
// IV on 16 bytes: [SSSSSSSSXXXXXXXX]
// where SSSSSSSS is the 64-bit salt and
// XXXXXXXX is the 64-bit base counter
AP4_CopyMemory(out, m_Salt, 8);
AP4_BytesFromUInt64BE(&out[8], counter);
// encrypt the payload
m_Cipher->SetIV(out);
m_Cipher->ProcessBuffer(data_in.GetData(),
data_in.GetDataSize(),
out+AP4_CIPHER_BLOCK_SIZE,
&out_size,
true);
AP4_CHECK(data_out.SetDataSize(out_size+AP4_CIPHER_BLOCK_SIZE+1));
return AP4_SUCCESS;
}
/*----------------------------------------------------------------------
| AP4_MemoryByteStream::ReadPartial
+---------------------------------------------------------------------*/
AP4_Result
AP4_MemoryByteStream::ReadPartial(void* buffer,
AP4_Size bytes_to_read,
AP4_Size& bytes_read)
{
// default values
bytes_read = 0;
// shortcut
if (bytes_to_read == 0) {
return AP4_SUCCESS;
}
// clamp to range
if (m_Position+bytes_to_read > m_Buffer->GetDataSize()) {
bytes_to_read = (AP4_Size)(m_Buffer->GetDataSize() - m_Position);
}
// check for end of stream
if (bytes_to_read == 0) {
return AP4_ERROR_EOS;
}
// read from the memory
AP4_CopyMemory(buffer, m_Buffer->GetData()+m_Position, bytes_to_read);
m_Position += bytes_to_read;
bytes_read = bytes_to_read;
return AP4_SUCCESS;
}
/*----------------------------------------------------------------------
| AP4_CbcStreamCipher::SetStreamOffset
+---------------------------------------------------------------------*/
AP4_Result
AP4_CbcStreamCipher::SetStreamOffset(AP4_UI64 offset,
AP4_Cardinal* preroll)
{
// does not make sense for encryption
if (m_BlockCipher->GetDirection() == AP4_BlockCipher::ENCRYPT) {
return AP4_ERROR_NOT_SUPPORTED;
}
// check params
if (preroll == NULL) return AP4_ERROR_INVALID_PARAMETERS;
// reset the end of stream flag
m_Eos = false;
// invalidate the chain block
m_ChainBlockFullness = 0;
// flush cached data
m_InBlockFullness = 0;
// compute the preroll
if (offset < AP4_CIPHER_BLOCK_SIZE) {
AP4_CopyMemory(m_ChainBlock, m_Iv, AP4_CIPHER_BLOCK_SIZE);
m_ChainBlockFullness = AP4_CIPHER_BLOCK_SIZE;
*preroll = (AP4_Cardinal)offset;
} else {
*preroll = (AP4_Cardinal) ((offset%AP4_CIPHER_BLOCK_SIZE) + AP4_CIPHER_BLOCK_SIZE);
}
m_StreamOffset = offset-*preroll;
m_OutputSkip = (AP4_Size)(offset%AP4_CIPHER_BLOCK_SIZE);
return AP4_SUCCESS;
}
/*----------------------------------------------------------------------
| AP4_MarlinIpmpTrackEncrypter:ProcessSample
+---------------------------------------------------------------------*/
AP4_Result
AP4_MarlinIpmpTrackEncrypter::ProcessSample(AP4_DataBuffer& data_in,
AP4_DataBuffer& data_out)
{
AP4_Result result;
const AP4_UI08* in = data_in.GetData();
AP4_Size in_size = data_in.GetDataSize();
// default to 0 output
data_out.SetDataSize(0);
// process the sample data
AP4_Size out_size = AP4_CIPHER_BLOCK_SIZE*(2+(in_size/AP4_CIPHER_BLOCK_SIZE));
data_out.SetDataSize(out_size);
AP4_UI08* out = data_out.UseData();
// write the IV
AP4_CopyMemory(out, m_IV, AP4_CIPHER_BLOCK_SIZE);
out_size -= AP4_CIPHER_BLOCK_SIZE;
// encrypt the data
m_Cipher->SetIV(m_IV);
result = m_Cipher->ProcessBuffer(in,
in_size,
out+AP4_AES_BLOCK_SIZE,
&out_size,
true);
if (AP4_FAILED(result)) return result;
// update the payload size
data_out.SetDataSize(out_size+AP4_AES_BLOCK_SIZE);
return AP4_SUCCESS;
}
/*----------------------------------------------------------------------
| AP4_MarlinIpmpTrackEncrypter::AP4_MarlinIpmpTrackEncrypter
+---------------------------------------------------------------------*/
AP4_MarlinIpmpTrackEncrypter::AP4_MarlinIpmpTrackEncrypter(AP4_StreamCipher* cipher,
const AP4_UI08* iv) :
m_Cipher(cipher)
{
// copy the IV
AP4_CopyMemory(m_IV, iv, AP4_AES_BLOCK_SIZE);
}
/*----------------------------------------------------------------------
| AP4_OmaDcfCtrSampleDecrypter::DecryptSampleData
+---------------------------------------------------------------------*/
AP4_Result
AP4_OmaDcfCtrSampleDecrypter::DecryptSampleData(AP4_DataBuffer& data_in,
AP4_DataBuffer& data_out,
const AP4_UI08* /*iv*/)
{
bool is_encrypted = true;
const unsigned char* in = data_in.GetData();
AP4_Size in_size = data_in.GetDataSize();
// default to 0 output
AP4_CHECK(data_out.SetDataSize(0));
// check the selective encryption flag
if (m_SelectiveEncryption) {
if (in_size < 1) return AP4_ERROR_INVALID_FORMAT;
is_encrypted = ((in[0]&0x80)!=0);
in++;
}
// check the size
unsigned int header_size = (m_SelectiveEncryption?1:0)+(is_encrypted?m_IvLength:0);
if (header_size > in_size) return AP4_ERROR_INVALID_FORMAT;
// process the sample data
AP4_Size payload_size = in_size-header_size;
AP4_CHECK(data_out.Reserve(payload_size));
unsigned char* out = data_out.UseData();
if (is_encrypted) {
// set the IV
if (m_IvLength == 16) {
m_Cipher->SetIV(in);
} else {
AP4_UI08 iv[16];
AP4_SetMemory(iv, 0, 16);
AP4_CopyMemory(iv+16-m_IvLength, in, m_IvLength);
m_Cipher->SetIV(iv);
}
AP4_CHECK(m_Cipher->ProcessBuffer(in+m_IvLength,
payload_size,
out));
} else {
AP4_CopyMemory(out, in, payload_size);
}
AP4_CHECK(data_out.SetDataSize(payload_size));
return AP4_SUCCESS;
}
/*----------------------------------------------------------------------
| AP4_BlocAtom::SetPurchaseLocation
+---------------------------------------------------------------------*/
void
AP4_BlocAtom::SetPurchaseLocation(const char* purchase_location)
{
unsigned int len = (unsigned int)AP4_StringLength(purchase_location);
if (len > 256) len = 256;
AP4_CopyMemory(m_PurchaseLocation, purchase_location, len);
AP4_SetMemory(&m_PurchaseLocation[len], 0, 256-len+1);
}
/*----------------------------------------------------------------------
| AP4_StcoAtom::AP4_StcoAtom
+---------------------------------------------------------------------*/
AP4_StcoAtom::AP4_StcoAtom(AP4_UI32* entries, AP4_UI32 entry_count) :
AP4_Atom(AP4_ATOM_TYPE_STCO,
AP4_FULL_ATOM_HEADER_SIZE+4+entry_count*4,
0, 0),
m_Entries(new AP4_UI32[entry_count]),
m_EntryCount(entry_count)
{
AP4_CopyMemory(m_Entries, entries, m_EntryCount*4);
}
SampleFileStorage::SampleFileStorage(const char *basename) {
m_Stream = NULL;
AP4_Size name_length = (AP4_Size)AP4_StringLength(basename);
char* filename = new char[name_length+2];
AP4_CopyMemory(filename, basename, name_length);
filename[name_length] = '_';
filename[name_length+1] = '\0';
m_Filename = filename;
delete[] filename;
}
/*----------------------------------------------------------------------
| MakeFramePrefix
+---------------------------------------------------------------------*/
static AP4_Result
MakeFramePrefix(AP4_SampleDescription* sdesc, AP4_DataBuffer& prefix, unsigned int& nalu_length_size)
{
AP4_AvcSampleDescription* avc_desc = AP4_DYNAMIC_CAST(AP4_AvcSampleDescription, sdesc);
if (avc_desc == NULL) {
fprintf(stderr, "ERROR: track does not contain an AVC stream\n");
return AP4_FAILURE;
}
if (sdesc->GetFormat() == AP4_SAMPLE_FORMAT_AVC3 || sdesc->GetFormat() == AP4_SAMPLE_FORMAT_AVC4) {
// no need for a prefix, SPS/PPS NALs should be in the elementary stream already
return AP4_SUCCESS;
}
// make the SPS/PPS prefix
nalu_length_size = avc_desc->GetNaluLengthSize();
for (unsigned int i=0; i<avc_desc->GetSequenceParameters().ItemCount(); i++) {
AP4_DataBuffer& buffer = avc_desc->GetSequenceParameters()[i];
unsigned int prefix_size = prefix.GetDataSize();
prefix.SetDataSize(prefix_size+4+buffer.GetDataSize());
unsigned char* p = prefix.UseData()+prefix_size;
*p++ = 0;
*p++ = 0;
*p++ = 0;
*p++ = 1;
AP4_CopyMemory(p, buffer.GetData(), buffer.GetDataSize());
}
for (unsigned int i=0; i<avc_desc->GetPictureParameters().ItemCount(); i++) {
AP4_DataBuffer& buffer = avc_desc->GetPictureParameters()[i];
unsigned int prefix_size = prefix.GetDataSize();
prefix.SetDataSize(prefix_size+4+buffer.GetDataSize());
unsigned char* p = prefix.UseData()+prefix_size;
*p++ = 0;
*p++ = 0;
*p++ = 0;
*p++ = 1;
AP4_CopyMemory(p, buffer.GetData(), buffer.GetDataSize());
}
return AP4_SUCCESS;
}
/*----------------------------------------------------------------------
| AP4_CtrStreamCipher::SetIV
+---------------------------------------------------------------------*/
AP4_Result
AP4_CtrStreamCipher::SetIV(const AP4_UI08* iv)
{
if (iv) {
AP4_CopyMemory(m_IV, iv, AP4_CIPHER_BLOCK_SIZE);
} else {
AP4_SetMemory(m_IV, 0, AP4_CIPHER_BLOCK_SIZE);
}
// for the stream offset back to 0
m_CacheValid = false;
return SetStreamOffset(0);
}
/*----------------------------------------------------------------------
| AP4_AvccAtom::UpdateRawBytes
+---------------------------------------------------------------------*/
void
AP4_AvccAtom::UpdateRawBytes()
{
// compute the payload size
unsigned int payload_size = 6;
for (unsigned int i=0; i<m_SequenceParameters.ItemCount(); i++) {
payload_size += 2+m_SequenceParameters[i].GetDataSize();
}
++payload_size;
for (unsigned int i=0; i<m_PictureParameters.ItemCount(); i++) {
payload_size += 2+m_PictureParameters[i].GetDataSize();
}
m_RawBytes.SetDataSize(payload_size);
AP4_UI08* payload = m_RawBytes.UseData();
payload[0] = m_ConfigurationVersion;
payload[1] = m_Profile;
payload[2] = m_ProfileCompatibility;
payload[3] = m_Level;
payload[4] = 0xFC | (m_NaluLengthSize-1);
payload[5] = 0xE0 | m_SequenceParameters.ItemCount();
unsigned int cursor = 6;
for (unsigned int i=0; i<m_SequenceParameters.ItemCount(); i++) {
AP4_UI16 param_length = (AP4_UI16)m_SequenceParameters[i].GetDataSize();
AP4_BytesFromUInt16BE(&payload[cursor], param_length);
cursor += 2;
AP4_CopyMemory(&payload[cursor], m_SequenceParameters[i].GetData(), param_length);
cursor += param_length;
}
payload[cursor++] = m_PictureParameters.ItemCount();
for (unsigned int i=0; i<m_PictureParameters.ItemCount(); i++) {
AP4_UI16 param_length = (AP4_UI16)m_PictureParameters[i].GetDataSize();
AP4_BytesFromUInt16BE(&payload[cursor], param_length);
cursor += 2;
AP4_CopyMemory(&payload[cursor], m_PictureParameters[i].GetData(), param_length);
cursor += param_length;
}
}
/*----------------------------------------------------------------------
| AP4_MkidAtom::AddEntry
+---------------------------------------------------------------------*/
AP4_Result
AP4_MkidAtom::AddEntry(const AP4_UI08* kid, const char* content_id)
{
unsigned int content_id_size = (unsigned int)AP4_StringLength(content_id);
unsigned int entry_count = m_Entries.ItemCount();
// add the entry
m_Entries.SetItemCount(entry_count+1);
AP4_CopyMemory(m_Entries[entry_count].m_KID, kid, 16);
m_Entries[entry_count].m_ContentId.Assign(content_id, content_id_size);
// update the size
m_Size32 += 4+16+content_id_size;
return AP4_SUCCESS;
}
/*----------------------------------------------------------------------
| AP4_OmaDbcCbcSampleDecrypter::DecryptSampleData
+---------------------------------------------------------------------*/
AP4_Result
AP4_OmaDcfCbcSampleDecrypter::DecryptSampleData(AP4_DataBuffer& data_in,
AP4_DataBuffer& data_out,
const AP4_UI08* /*iv*/)
{
bool is_encrypted = true;
const unsigned char* in = data_in.GetData();
AP4_Size in_size = data_in.GetDataSize();
AP4_Size out_size;
// default to 0 output
AP4_CHECK(data_out.SetDataSize(0));
// check the selective encryption flag
if (m_SelectiveEncryption) {
if (in_size < 1) return AP4_ERROR_INVALID_FORMAT;
is_encrypted = ((in[0]&0x80)!=0);
in++;
}
// check the size
unsigned int header_size = (m_SelectiveEncryption?1:0)+(is_encrypted?m_IvLength:0);
if (header_size > in_size) return AP4_ERROR_INVALID_FORMAT;
// process the sample data
unsigned int payload_size = in_size-header_size;
data_out.Reserve(payload_size);
unsigned char* out = data_out.UseData();
if (is_encrypted) {
// get the IV
const AP4_UI08* iv = (const AP4_UI08*)in;
in += AP4_CIPHER_BLOCK_SIZE;
m_Cipher->SetIV(iv);
out_size = payload_size;
AP4_CHECK(m_Cipher->ProcessBuffer(in, payload_size, out, &out_size, true));
} else {
AP4_CopyMemory(out, in, payload_size);
out_size = payload_size;
}
AP4_CHECK(data_out.SetDataSize(out_size));
return AP4_SUCCESS;
}
/*----------------------------------------------------------------------
| AP4_MemoryByteStream::WritePartial
+---------------------------------------------------------------------*/
AP4_Result
AP4_MemoryByteStream::WritePartial(const void* buffer,
AP4_Size bytes_to_write,
AP4_Size& bytes_written)
{
// default values
bytes_written = 0;
// shortcut
if (bytes_to_write == 0) {
return AP4_SUCCESS;
}
// check that we don't exceed the max
if (m_Position+bytes_to_write > (AP4_Position)AP4_MEMORY_BYTE_STREAM_MAX_SIZE) {
return AP4_ERROR_OUT_OF_RANGE;
}
// reserve space in the buffer
AP4_Result result = m_Buffer->Reserve((AP4_Size)(m_Position+bytes_to_write));
if (AP4_SUCCEEDED(result)) {
m_Buffer->SetDataSize((AP4_Size)(m_Position+bytes_to_write));
} else {
// failed to reserve, most likely caused by a buffer that has
// external storage
if (m_Position+bytes_to_write > m_Buffer->GetDataSize()) {
bytes_to_write = (AP4_Size)(m_Buffer->GetDataSize() - m_Position);
}
}
// check for en of stream
if (bytes_to_write == 0) {
return AP4_ERROR_EOS;
}
// write to memory
AP4_CopyMemory((void*)(m_Buffer->UseData()+m_Position), buffer, bytes_to_write);
m_Position += bytes_to_write;
bytes_written = bytes_to_write;
return AP4_SUCCESS;
}
/*----------------------------------------------------------------------
| AP4_BufferedInputStream::ReadPartial
+---------------------------------------------------------------------*/
AP4_Result
AP4_BufferedInputStream::ReadPartial(void* buffer,
AP4_Size bytes_to_read,
AP4_Size& bytes_read)
{
// check for shortcut
if (bytes_to_read == 0) {
bytes_read = 0;
return AP4_SUCCESS;
}
// compute how much data is available in the buffer
assert(m_BufferPosition <= m_Buffer.GetDataSize());
AP4_Size available = m_Buffer.GetDataSize()-m_BufferPosition;
// refill the buffer if it is empty
if (available == 0) {
AP4_Result result = Refill();
if (AP4_FAILED(result)) {
bytes_read = 0;
return result;
}
assert(m_BufferPosition == 0);
assert(m_Buffer.GetDataSize() != 0);
available = m_Buffer.GetDataSize()-m_BufferPosition;
}
// clamp the number of bytes to read to what's available
if (bytes_to_read > available) bytes_to_read = available;
bytes_read = bytes_to_read;
// copy the buffered data
AP4_CopyMemory(buffer, m_Buffer.GetData()+m_BufferPosition, bytes_to_read);
m_BufferPosition += bytes_to_read;
assert(m_BufferPosition <= m_Buffer.GetDataSize());
return AP4_SUCCESS;
}
/*----------------------------------------------------------------------
| AP4_UuidAtom::AP4_UuidAtom
+---------------------------------------------------------------------*/
AP4_UuidAtom::AP4_UuidAtom(AP4_UI64 size, const AP4_UI08* uuid) :
AP4_Atom(AP4_ATOM_TYPE_UUID, size)
{
AP4_CopyMemory(m_Uuid, uuid, 16);
}
/*----------------------------------------------------------------------
| AP4_CbcStreamCipher::DecryptBuffer
+---------------------------------------------------------------------*/
AP4_Result
AP4_CbcStreamCipher::DecryptBuffer(const AP4_UI08* in,
AP4_Size in_size,
AP4_UI08* out,
AP4_Size* out_size,
bool is_last_buffer)
{
// we don't do much checking here because this method is only called
// from ProcessBuffer(), which does all the parameter checking
// deal chain-block buffering
if (m_ChainBlockFullness != AP4_CIPHER_BLOCK_SIZE) {
unsigned int needed = AP4_CIPHER_BLOCK_SIZE-m_ChainBlockFullness;
unsigned int chunk = (in_size > needed) ? needed : in_size;
AP4_CopyMemory(&m_ChainBlock[m_ChainBlockFullness], in, chunk);
in_size -= chunk;
in += chunk;
m_ChainBlockFullness += chunk;
m_StreamOffset += chunk;
if (m_ChainBlockFullness != AP4_CIPHER_BLOCK_SIZE) {
// not enough to continue
*out_size = 0;
return AP4_SUCCESS;
}
}
AP4_ASSERT(m_ChainBlockFullness == AP4_CIPHER_BLOCK_SIZE);
// compute how many blocks we span
AP4_UI64 start_block = (m_StreamOffset-m_InBlockFullness)/AP4_CIPHER_BLOCK_SIZE;
AP4_UI64 end_block = (m_StreamOffset+in_size)/AP4_CIPHER_BLOCK_SIZE;
AP4_UI32 blocks_needed = (AP4_UI32)(end_block-start_block);
// compute how many blocks we will need to produce
if (*out_size < blocks_needed*AP4_CIPHER_BLOCK_SIZE) {
*out_size = blocks_needed*AP4_CIPHER_BLOCK_SIZE;
return AP4_ERROR_BUFFER_TOO_SMALL;
}
*out_size = blocks_needed*AP4_CIPHER_BLOCK_SIZE;
if (blocks_needed && m_OutputSkip) *out_size -= m_OutputSkip;
// shortcut
if (in_size == 0) return AP4_SUCCESS;
// deal with in-block buffering
// NOTE: if we have bytes to skip on output, always use the in-block buffer for
// the first block, even if we're aligned, this makes the code simpler
AP4_ASSERT(m_InBlockFullness < AP4_CIPHER_BLOCK_SIZE);
if (m_OutputSkip || m_InBlockFullness) {
unsigned int needed = AP4_CIPHER_BLOCK_SIZE-m_InBlockFullness;
unsigned int chunk = (in_size > needed) ? needed : in_size;
AP4_CopyMemory(&m_InBlock[m_InBlockFullness], in, chunk);
in_size -= chunk;
in += chunk;
m_InBlockFullness += chunk;
m_StreamOffset += chunk;
if (m_InBlockFullness != AP4_CIPHER_BLOCK_SIZE) {
// not enough to continue
*out_size = 0;
return AP4_SUCCESS;
}
AP4_UI08 out_block[AP4_CIPHER_BLOCK_SIZE];
AP4_Result result = m_BlockCipher->Process(m_InBlock, AP4_CIPHER_BLOCK_SIZE, out_block, m_ChainBlock);
m_InBlockFullness = 0;
if (AP4_FAILED(result)) {
*out_size = 0;
return result;
}
AP4_CopyMemory(m_ChainBlock, m_InBlock, AP4_CIPHER_BLOCK_SIZE);
if (m_OutputSkip) {
AP4_ASSERT(m_OutputSkip < AP4_CIPHER_BLOCK_SIZE);
AP4_CopyMemory(out, &out_block[m_OutputSkip], AP4_CIPHER_BLOCK_SIZE-m_OutputSkip);
out += AP4_CIPHER_BLOCK_SIZE-m_OutputSkip;
m_OutputSkip = 0;
} else {
AP4_CopyMemory(out, out_block, AP4_CIPHER_BLOCK_SIZE);
out += AP4_CIPHER_BLOCK_SIZE;
}
}
AP4_ASSERT(m_InBlockFullness == 0);
AP4_ASSERT(m_OutputSkip == 0);
// process full blocks
unsigned int block_count = in_size/AP4_CIPHER_BLOCK_SIZE;
if (block_count) {
AP4_UI32 blocks_size = block_count*AP4_CIPHER_BLOCK_SIZE;
AP4_Result result = m_BlockCipher->Process(in, blocks_size, out, m_ChainBlock);
AP4_CopyMemory(m_ChainBlock, in+blocks_size-AP4_CIPHER_BLOCK_SIZE, AP4_CIPHER_BLOCK_SIZE);
if (AP4_FAILED(result)) {
*out_size = 0;
return result;
}
in += blocks_size;
out += blocks_size;
in_size -= blocks_size;
m_StreamOffset += blocks_size;
}
// buffer partial block leftovers
if (in_size) {
AP4_ASSERT(in_size < AP4_CIPHER_BLOCK_SIZE);
AP4_CopyMemory(m_InBlock, in, in_size);
m_InBlockFullness = in_size;
m_StreamOffset += in_size;
}
// deal with padding
if (is_last_buffer) {
AP4_UI08 pad_byte = *(out-1);
if (pad_byte > AP4_CIPHER_BLOCK_SIZE ||
*out_size < pad_byte) {
*out_size = 0;
return AP4_ERROR_INVALID_FORMAT;
}
*out_size -= pad_byte;
}
return AP4_SUCCESS;
}
/*----------------------------------------------------------------------
| AP4_CbcStreamCipher::EncryptBuffer
+---------------------------------------------------------------------*/
AP4_Result
AP4_CbcStreamCipher::EncryptBuffer(const AP4_UI08* in,
AP4_Size in_size,
AP4_UI08* out,
AP4_Size* out_size,
bool is_last_buffer)
{
// we don't do much checking here because this method is only called
// from ProcessBuffer(), which does all the parameter checking
// compute how many blocks we span
AP4_UI64 start_block = (m_StreamOffset-m_InBlockFullness)/AP4_CIPHER_BLOCK_SIZE;
AP4_UI64 end_block = (m_StreamOffset+in_size)/AP4_CIPHER_BLOCK_SIZE;
AP4_UI32 blocks_needed = (AP4_UI32)(end_block-start_block);
// compute how many blocks we will need to produce
if (is_last_buffer) {
++blocks_needed;
}
if (*out_size < blocks_needed*AP4_CIPHER_BLOCK_SIZE) {
*out_size = blocks_needed*AP4_CIPHER_BLOCK_SIZE;
return AP4_ERROR_BUFFER_TOO_SMALL;
}
*out_size = blocks_needed*AP4_CIPHER_BLOCK_SIZE;
// finish any incomplete block from a previous call
unsigned int offset = (unsigned int)(m_StreamOffset%AP4_CIPHER_BLOCK_SIZE);
AP4_ASSERT(m_InBlockFullness == offset);
if (offset) {
unsigned int chunk = AP4_CIPHER_BLOCK_SIZE-offset;
if (chunk > in_size) chunk = in_size;
for (unsigned int x=0; x<chunk; x++) {
m_InBlock[x+offset] = in[x];
}
in += chunk;
in_size -= chunk;
m_StreamOffset += chunk;
m_InBlockFullness += chunk;
if (offset+chunk == AP4_CIPHER_BLOCK_SIZE) {
// we have filled the input block, encrypt it
AP4_Result result = m_BlockCipher->Process(m_InBlock, AP4_CIPHER_BLOCK_SIZE, out, m_ChainBlock);
AP4_CopyMemory(m_ChainBlock, out, AP4_CIPHER_BLOCK_SIZE);
m_InBlockFullness = 0;
if (AP4_FAILED(result)) {
*out_size = 0;
return result;
}
out += AP4_CIPHER_BLOCK_SIZE;
}
}
// encrypt the whole blocks
unsigned int block_count = in_size/AP4_CIPHER_BLOCK_SIZE;
if (block_count) {
AP4_ASSERT(m_InBlockFullness == 0);
AP4_UI32 blocks_size = block_count*AP4_CIPHER_BLOCK_SIZE;
AP4_Result result = m_BlockCipher->Process(in, blocks_size, out, m_ChainBlock);
AP4_CopyMemory(m_ChainBlock, out+blocks_size-AP4_CIPHER_BLOCK_SIZE, AP4_CIPHER_BLOCK_SIZE);
if (AP4_FAILED(result)) {
*out_size = 0;
return result;
}
in += blocks_size;
out += blocks_size;
in_size -= blocks_size;
m_StreamOffset += blocks_size;
}
// deal with what's left
if (in_size) {
AP4_ASSERT(in_size < AP4_CIPHER_BLOCK_SIZE);
for (unsigned int x=0; x<in_size; x++) {
m_InBlock[x+m_InBlockFullness] = in[x];
}
m_InBlockFullness += in_size;
m_StreamOffset += in_size;
}
// pad if needed
if (is_last_buffer) {
AP4_ASSERT(m_InBlockFullness == m_StreamOffset%AP4_CIPHER_BLOCK_SIZE);
AP4_UI08 pad_byte = AP4_CIPHER_BLOCK_SIZE-(AP4_UI08)(m_StreamOffset%AP4_CIPHER_BLOCK_SIZE);
for (unsigned int x=AP4_CIPHER_BLOCK_SIZE-pad_byte; x<AP4_CIPHER_BLOCK_SIZE; x++) {
m_InBlock[x] = pad_byte;
}
AP4_Result result = m_BlockCipher->Process(m_InBlock, AP4_CIPHER_BLOCK_SIZE, out, m_ChainBlock);
AP4_CopyMemory(m_ChainBlock, out, AP4_CIPHER_BLOCK_SIZE);
m_InBlockFullness = 0;
if (AP4_FAILED(result)) {
*out_size = 0;
return result;
}
}
return AP4_SUCCESS;
}
/*----------------------------------------------------------------------
| WriteSample
+---------------------------------------------------------------------*/
static void
WriteSample(const AP4_DataBuffer& sample_data,
AP4_DataBuffer& prefix,
unsigned int nalu_length_size,
AP4_ByteStream* output)
{
const unsigned char* data = sample_data.GetData();
unsigned int data_size = sample_data.GetDataSize();
// detect if we have VPS/SPS/PPS and/or AUD NAL units already
bool have_param_sets = false;
bool have_access_unit_delimiter = false;
while (data_size) {
// sanity check
if (data_size < nalu_length_size) break;
// get the next NAL unit
AP4_UI32 nalu_size;
if (nalu_length_size == 1) {
nalu_size = *data++;
data_size--;
} else if (nalu_length_size == 2) {
nalu_size = AP4_BytesToInt16BE(data);
data += 2;
data_size -= 2;
} else if (nalu_length_size == 4) {
nalu_size = AP4_BytesToInt32BE(data);
data += 4;
data_size -= 4;
} else {
break;
}
if (nalu_size > data_size) break;
unsigned int nal_unit_type = (data[0]>>1)&0x3F;
if (nal_unit_type == AP4_HEVC_NALU_TYPE_AUD_NUT) {
have_access_unit_delimiter = true;
}
if (nal_unit_type == AP4_HEVC_NALU_TYPE_VPS_NUT ||
nal_unit_type == AP4_HEVC_NALU_TYPE_SPS_NUT ||
nal_unit_type == AP4_HEVC_NALU_TYPE_PPS_NUT) {
have_param_sets = true;
break;
}
// move to the next NAL unit
data += nalu_size;
data_size -= nalu_size;
}
data = sample_data.GetData();
data_size = sample_data.GetDataSize();
// allocate a buffer for the frame data
AP4_DataBuffer frame_data;
unsigned char* frame_buffer = NULL;
// add a delimiter if we don't already have one
if (data_size && !have_access_unit_delimiter) {
AP4_Size frame_data_size = frame_data.GetDataSize();
frame_data.SetDataSize(frame_data_size+7);
frame_buffer = frame_data.UseData()+frame_data_size;
// start of access unit
frame_buffer[0] = 0;
frame_buffer[1] = 0;
frame_buffer[2] = 0;
frame_buffer[3] = 1;
frame_buffer[4] = AP4_HEVC_NALU_TYPE_AUD_NUT<<1;
frame_buffer[5] = 1;
frame_buffer[6] = 0x40; // pic_type = 2 (B,P,I)
}
// write the NAL units
bool prefix_added = false;
while (data_size) {
// sanity check
if (data_size < nalu_length_size) break;
// get the next NAL unit
AP4_UI32 nalu_size;
if (nalu_length_size == 1) {
nalu_size = *data++;
data_size--;
} else if (nalu_length_size == 2) {
nalu_size = AP4_BytesToInt16BE(data);
data += 2;
data_size -= 2;
} else if (nalu_length_size == 4) {
nalu_size = AP4_BytesToInt32BE(data);
data += 4;
data_size -= 4;
} else {
break;
}
if (nalu_size > data_size) break;
// add the prefix if needed
if (!have_param_sets && !prefix_added && !have_access_unit_delimiter) {
AP4_Size frame_data_size = frame_data.GetDataSize();
frame_data.SetDataSize(frame_data_size+prefix.GetDataSize());
frame_buffer = frame_data.UseData()+frame_data_size;
AP4_CopyMemory(frame_buffer, prefix.GetData(), prefix.GetDataSize());
prefix_added = true;
}
// add a start code before the NAL unit
AP4_Size frame_data_size = frame_data.GetDataSize();
frame_data.SetDataSize(frame_data_size+3+nalu_size);
frame_buffer = frame_data.UseData()+frame_data_size;
frame_buffer[0] = 0;
frame_buffer[1] = 0;
frame_buffer[2] = 1;
AP4_CopyMemory(frame_buffer+3, data, nalu_size);
// add the prefix if needed
if (!have_param_sets && !prefix_added) {
AP4_Size frame_data_size = frame_data.GetDataSize();
frame_data.SetDataSize(frame_data_size+prefix.GetDataSize());
frame_buffer = frame_data.UseData()+frame_data_size;
AP4_CopyMemory(frame_buffer, prefix.GetData(), prefix.GetDataSize());
prefix_added = true;
}
// move to the next NAL unit
data += nalu_size;
data_size -= nalu_size;
}
output->Write(frame_data.GetData(), frame_data.GetDataSize());
}
/*----------------------------------------------------------------------
| MakeFramePrefix
+---------------------------------------------------------------------*/
static AP4_Result
MakeFramePrefix(AP4_SampleDescription* sdesc, AP4_DataBuffer& prefix, unsigned int& nalu_length_size)
{
AP4_HevcSampleDescription* hevc_desc = AP4_DYNAMIC_CAST(AP4_HevcSampleDescription, sdesc);
if (hevc_desc == NULL) {
fprintf(stderr, "ERROR: track does not contain an HEVC stream\n");
return AP4_FAILURE;
}
// extract the nalu length size
nalu_length_size = hevc_desc->GetNaluLengthSize();
// make the VPS/SPS/PPS prefix
for (unsigned int i=0; i<hevc_desc->GetSequences().ItemCount(); i++) {
const AP4_HvccAtom::Sequence& seq = hevc_desc->GetSequences()[i];
if (seq.m_NaluType == AP4_HEVC_NALU_TYPE_VPS_NUT) {
for (unsigned int j=0; j<seq.m_Nalus.ItemCount(); j++) {
const AP4_DataBuffer& buffer = seq.m_Nalus[j];
unsigned int prefix_size = prefix.GetDataSize();
prefix.SetDataSize(prefix_size+4+buffer.GetDataSize());
unsigned char* p = prefix.UseData()+prefix_size;
*p++ = 0;
*p++ = 0;
*p++ = 0;
*p++ = 1;
AP4_CopyMemory(p, buffer.GetData(), buffer.GetDataSize());
}
}
}
for (unsigned int i=0; i<hevc_desc->GetSequences().ItemCount(); i++) {
const AP4_HvccAtom::Sequence& seq = hevc_desc->GetSequences()[i];
if (seq.m_NaluType == AP4_HEVC_NALU_TYPE_SPS_NUT) {
for (unsigned int j=0; j<seq.m_Nalus.ItemCount(); j++) {
const AP4_DataBuffer& buffer = seq.m_Nalus[j];
unsigned int prefix_size = prefix.GetDataSize();
prefix.SetDataSize(prefix_size+4+buffer.GetDataSize());
unsigned char* p = prefix.UseData()+prefix_size;
*p++ = 0;
*p++ = 0;
*p++ = 0;
*p++ = 1;
AP4_CopyMemory(p, buffer.GetData(), buffer.GetDataSize());
}
}
}
for (unsigned int i=0; i<hevc_desc->GetSequences().ItemCount(); i++) {
const AP4_HvccAtom::Sequence& seq = hevc_desc->GetSequences()[i];
if (seq.m_NaluType == AP4_HEVC_NALU_TYPE_PPS_NUT) {
for (unsigned int j=0; j<seq.m_Nalus.ItemCount(); j++) {
const AP4_DataBuffer& buffer = seq.m_Nalus[j];
unsigned int prefix_size = prefix.GetDataSize();
prefix.SetDataSize(prefix_size+4+buffer.GetDataSize());
unsigned char* p = prefix.UseData()+prefix_size;
*p++ = 0;
*p++ = 0;
*p++ = 0;
*p++ = 1;
AP4_CopyMemory(p, buffer.GetData(), buffer.GetDataSize());
}
}
}
return AP4_SUCCESS;
}
/*----------------------------------------------------------------------
| WriteSample
+---------------------------------------------------------------------*/
static void
WriteSample(const AP4_DataBuffer& sample_data,
AP4_DataBuffer& prefix,
unsigned int nalu_length_size,
AP4_ByteStream* output)
{
const unsigned char* data = sample_data.GetData();
unsigned int data_size = sample_data.GetDataSize();
// allocate a buffer for the PES packet
AP4_DataBuffer frame_data;
unsigned char* frame_buffer = NULL;
// add a delimiter if we don't already have one
bool have_access_unit_delimiter = (data_size > nalu_length_size) && ((data[nalu_length_size] & 0x1F) == AP4_AVC_NAL_UNIT_TYPE_ACCESS_UNIT_DELIMITER);
if (!have_access_unit_delimiter) {
AP4_Size frame_data_size = frame_data.GetDataSize();
frame_data.SetDataSize(frame_data_size+6);
frame_buffer = frame_data.UseData()+frame_data_size;
// start of access unit
frame_buffer[0] = 0;
frame_buffer[1] = 0;
frame_buffer[2] = 0;
frame_buffer[3] = 1;
frame_buffer[4] = 9; // NAL type = Access Unit Delimiter;
frame_buffer[5] = 0xE0; // Slice types = ANY
}
// write the NAL units
bool prefix_added = false;
while (data_size) {
// sanity check
if (data_size < nalu_length_size) break;
// get the next NAL unit
AP4_UI32 nalu_size;
if (nalu_length_size == 1) {
nalu_size = *data++;
data_size--;
} else if (nalu_length_size == 2) {
nalu_size = AP4_BytesToInt16BE(data);
data += 2;
data_size -= 2;
} else if (nalu_length_size == 4) {
nalu_size = AP4_BytesToInt32BE(data);
data += 4;
data_size -= 4;
} else {
break;
}
if (nalu_size > data_size) break;
// add the prefix if needed
if (prefix.GetDataSize() && !prefix_added && !have_access_unit_delimiter) {
AP4_Size frame_data_size = frame_data.GetDataSize();
frame_data.SetDataSize(frame_data_size+prefix.GetDataSize());
frame_buffer = frame_data.UseData()+frame_data_size;
AP4_CopyMemory(frame_buffer, prefix.GetData(), prefix.GetDataSize());
prefix_added = true;
}
// add a start code before the NAL unit
AP4_Size frame_data_size = frame_data.GetDataSize();
frame_data.SetDataSize(frame_data_size+3+nalu_size);
frame_buffer = frame_data.UseData()+frame_data_size;
frame_buffer[0] = 0;
frame_buffer[1] = 0;
frame_buffer[2] = 1;
AP4_CopyMemory(frame_buffer+3, data, nalu_size);
// add the prefix if needed
if (prefix.GetDataSize() && !prefix_added) {
AP4_Size frame_data_size = frame_data.GetDataSize();
frame_data.SetDataSize(frame_data_size+prefix.GetDataSize());
frame_buffer = frame_data.UseData()+frame_data_size;
AP4_CopyMemory(frame_buffer, prefix.GetData(), prefix.GetDataSize());
prefix_added = true;
}
// move to the next NAL unit
data += nalu_size;
data_size -= nalu_size;
}
output->Write(frame_data.GetData(), frame_data.GetDataSize());
}
/*----------------------------------------------------------------------
| AP4_UuidAtom::AP4_UuidAtom
+---------------------------------------------------------------------*/
AP4_UuidAtom::AP4_UuidAtom(AP4_UI64 size, const AP4_UI08* uuid, AP4_UI08 version, AP4_UI32 flags) :
AP4_Atom(AP4_ATOM_TYPE_UUID, size, false, version, flags)
{
AP4_CopyMemory(m_Uuid, uuid, 16);
}
