C++ AP4_DataBuffer::GetDataSize方法代码示例

/*----------------------------------------------------------------------
|   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_SgpdAtom::WriteFields
+---------------------------------------------------------------------*/
AP4_Result
AP4_SgpdAtom::WriteFields(AP4_ByteStream& stream)
{
    AP4_Result result;
    result = stream.WriteUI32(m_GroupingType);
    if (AP4_FAILED(result)) return result;

    if (m_Version >= 1) {
        result = stream.WriteUI32(m_DefaultLength);
        if (AP4_FAILED(result)) return result;
    }
    
    // write the children
    result = stream.WriteUI32(m_Entries.ItemCount());
    if (AP4_FAILED(result)) return result;
    
    for (AP4_List<AP4_DataBuffer>::Item* item = m_Entries.FirstItem();
                                         item;
                                         item = item->GetNext()) {
        AP4_DataBuffer* entry = item->GetData();
        if (m_Version >= 1) {
            if (m_DefaultLength == 0) {
                stream.WriteUI32((AP4_UI32)entry->GetDataSize());
            }
        }
        result = stream.Write(entry->GetData(), entry->GetDataSize());
        if (AP4_FAILED(result)) {
            return result;
        }
    }
    
    return AP4_SUCCESS;
}

/*----------------------------------------------------------------------
|       AP4_DecoderSpecificInfoDescriptor::AP4_DecoderSpecificInfoDescriptor
+---------------------------------------------------------------------*/
AP4_DecoderSpecificInfoDescriptor::AP4_DecoderSpecificInfoDescriptor(
    const AP4_DataBuffer& data) :
    AP4_Descriptor(AP4_DESCRIPTOR_TAG_DECODER_SPECIFIC_INFO, 
                   MinHeaderSize(data.GetDataSize()), 
                   data.GetDataSize()),
    m_Info(data)
{
}

/*----------------------------------------------------------------------
|   WV_CencSingleSampleDecrypter::DecryptSampleData
+---------------------------------------------------------------------*/
AP4_Result WV_CencSingleSampleDecrypter::DecryptSampleData(
  AP4_DataBuffer& data_in,
  AP4_DataBuffer& data_out,
  const AP4_UI08* iv,
  unsigned int    subsample_count,
  const AP4_UI16* bytes_of_cleartext_data,
  const AP4_UI32* bytes_of_encrypted_data)
{
  // the output has the same size as the input
  data_out.SetDataSize(data_in.GetDataSize());

  if (!wv_adapter)
  {
    data_out.SetData(data_in.GetData(), data_in.GetDataSize());
    return AP4_SUCCESS;
  }

  // check input parameters
  if (iv == NULL) return AP4_ERROR_INVALID_PARAMETERS;
  if (subsample_count) {
    if (bytes_of_cleartext_data == NULL || bytes_of_encrypted_data == NULL) {
      return AP4_ERROR_INVALID_PARAMETERS;
    }
  }

  // transform ap4 format into cmd format
  cdm::InputBuffer cdm_in;
  if (subsample_count > max_subsample_count_)
  {
    subsample_buffer_ = (cdm::SubsampleEntry*)realloc(subsample_buffer_, subsample_count*sizeof(cdm::SubsampleEntry));
    max_subsample_count_ = subsample_count;
  }
  for (cdm::SubsampleEntry *b(subsample_buffer_), *e(subsample_buffer_ + subsample_count); b != e; ++b, ++bytes_of_cleartext_data, ++bytes_of_encrypted_data)
  {
    b->clear_bytes = *bytes_of_cleartext_data;
    b->cipher_bytes = *bytes_of_encrypted_data;
  }
  cdm_in.data = data_in.GetData();
  cdm_in.data_size = data_in.GetDataSize();
  cdm_in.iv = iv;
  cdm_in.iv_size = 16; //Always 16, see AP4_CencSingleSampleDecrypter declaration.
  cdm_in.key_id = wv_adapter->GetKeyId();
  cdm_in.key_id_size = wv_adapter->GetKeyIdSize();
  cdm_in.num_subsamples = subsample_count;
  cdm_in.subsamples = subsample_buffer_;

  CdmBuffer buf(&data_out);
  CdmDecryptedBlock cdm_out;
  cdm_out.SetDecryptedBuffer(&buf);

  cdm::Status ret = wv_adapter->Decrypt(cdm_in, &cdm_out);

  return (ret == cdm::Status::kSuccess) ? AP4_SUCCESS : AP4_ERROR_INVALID_PARAMETERS;
}

/*----------------------------------------------------------------------
|   AP4_SgpdAtom::InspectFields
+---------------------------------------------------------------------*/
AP4_Result
AP4_SgpdAtom::InspectFields(AP4_AtomInspector& inspector)
{
    char fourcc[5];
    AP4_FormatFourChars(fourcc, m_GroupingType);
    inspector.AddField("grouping_type", fourcc);
    if (m_Version >= 1) {
        inspector.AddField("default_length", m_DefaultLength);
    }
    inspector.AddField("entry_count", m_Entries.ItemCount());
    
    // inspect entries
    char header[32];
    unsigned int i=0;
    for (AP4_List<AP4_DataBuffer>::Item* item = m_Entries.FirstItem();
                                         item;
                                         item = item->GetNext()) {
        AP4_DataBuffer* entry = item->GetData();
        AP4_FormatString(header, sizeof(header), "entry %02d", i);
        ++i;
        inspector.AddField(header, entry->GetData(), entry->GetDataSize());
    }

    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_UnknownSampleEntry::AP4_UnknownSampleEntry
+---------------------------------------------------------------------*/
AP4_UnknownSampleEntry::AP4_UnknownSampleEntry(AP4_Atom::Type  type, 
                                               AP4_DataBuffer& payload) :
    AP4_SampleEntry(type),
    m_Payload(payload)
{
    m_Size32 += payload.GetDataSize();
}

/*----------------------------------------------------------------------
|   AP4_DefaultFragmentHandler::ProcessSample
+---------------------------------------------------------------------*/
AP4_Result 
AP4_DefaultFragmentHandler::ProcessSample(AP4_DataBuffer& data_in, AP4_DataBuffer& data_out)
{
    if (m_TrackHandler == NULL) {
        data_out.SetData(data_in.GetData(), data_in.GetDataSize());
        return AP4_SUCCESS;
    }
    return m_TrackHandler->ProcessSample(data_in, data_out);
}

/*----------------------------------------------------------------------
|       AP4_IsmaTrackEncrypter::ProcessSample
+---------------------------------------------------------------------*/
AP4_Result 
AP4_IsmaTrackEncrypter::ProcessSample(AP4_DataBuffer& data_in,
                                      AP4_DataBuffer& data_out)
{
    AP4_Result result = m_Cipher->EncryptSample(data_in, data_out, m_ByteOffset, false);
    if (AP4_FAILED(result)) return result;

    m_ByteOffset += data_in.GetDataSize();
    return AP4_SUCCESS;
}

/*----------------------------------------------------------------------
|       AP4_IsmaCipher::DecryptSample
+---------------------------------------------------------------------*/
AP4_Result 
AP4_IsmaCipher::DecryptSample(AP4_DataBuffer& data_in,
                              AP4_DataBuffer& data_out)
{
    bool                 is_encrypted = true;
    const unsigned char* in = data_in.GetData();
    if (m_SelectiveEncryption) {
        is_encrypted = ((in[0]&1)==1);
        in++;
    }

    // get the IV (this implementation only supports un to 32 bits of IV)
    // so we skip anything beyond the last 4 bytes
    unsigned int to_read = m_IvLength;
    if (to_read > 16 || to_read == 0) return AP4_ERROR_INVALID_FORMAT;
    while (to_read > 4) {
        to_read--;
        in++;
    }
    AP4_UI32 iv = 0;
    while (to_read--) {
        iv = (iv<<8) | *in++; 
    }

    // get the key indicator (we only support up to 32 bits as well)
    to_read = m_KeyIndicatorLength;
    if (to_read > 4 ) return AP4_ERROR_INVALID_FORMAT;
    while (to_read > 4) {
        to_read--;
        in++;
    }
    AP4_UI32 key_indicator = 0;
    while (to_read--) {
        key_indicator = (key_indicator<<8) | *in++; 
    }
    // we only support key indicator = 0 for now... (TODO)
    if (key_indicator != 0) {
        return AP4_FAILURE;
    }

    // process the sample data
    unsigned int header_size = in-data_in.GetData();
    unsigned int payload_size = data_in.GetDataSize()-header_size;
    data_out.SetDataSize(payload_size);
    unsigned char* out = data_out.UseData();
    if (is_encrypted) {
        m_Cipher->SetStreamOffset(iv);
        m_Cipher->ProcessBuffer(in, out, payload_size);
    } else {
        memcpy(out, in, payload_size);
    }

    return AP4_SUCCESS;
}

/*----------------------------------------------------------------------
|   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;
}

/*----------------------------------------------------------------------
|   ShowSample
+---------------------------------------------------------------------*/
static void
ShowSample(AP4_Sample& sample, unsigned int index, AP4_SampleDecrypter* sample_decrypter)
{
    printf("[%06d] size=%6d duration=%6d", 
           index, 
           (int)sample.GetSize(), 
           (int)sample.GetDuration());
    printf(" offset=%10lld dts=%10lld cts=%10lld ", 
           sample.GetOffset(),
           sample.GetDts(), 
           sample.GetCts());
    if (sample.IsSync()) {
        printf(" [S] ");
    } else {
        printf("     ");
    }

    AP4_DataBuffer sample_data;
    sample.ReadData(sample_data);
    AP4_DataBuffer* data = &sample_data;
    
    AP4_DataBuffer decrypted_sample_data;
    if (sample_decrypter) {
        sample_decrypter->DecryptSampleData(sample_data, decrypted_sample_data);
        data = & decrypted_sample_data;
    }
    
    unsigned int show = data->GetDataSize();
    if (show > 12) show = 12; // max first 12 chars
    
    for (unsigned int i=0; i<show; i++) {
        printf("%02x", data->GetData()[i]);
    }
    if (show == data->GetDataSize()) {
        printf("\n");
    } else {
        printf("...\n");
    }
}

  virtual void UpdatePPSId(AP4_DataBuffer const &buffer) override
  {
    //Search the Slice header NALU
    const AP4_UI08 *data(buffer.GetData());
    unsigned int data_size(buffer.GetDataSize());
    for (; data_size;)
    {
      // sanity check
      if (data_size < naluLengthSize)
        break;

      // get the next NAL unit
      AP4_UI32 nalu_size;
      switch (naluLengthSize) {
      case 1:nalu_size = *data++; data_size--; break;
      case 2:nalu_size = AP4_BytesToInt16BE(data); data += 2; data_size -= 2; break;
      case 4:nalu_size = AP4_BytesToInt32BE(data); data += 4; data_size -= 4; break;
      default: data_size = 0; nalu_size = 1; break;
      }
      if (nalu_size > data_size)
        break;

      // Stop further NALU processing
      if (countPictureSetIds < 2)
        naluLengthSize = 0;

      unsigned int nal_unit_type = *data & 0x1F;

      if (
        //nal_unit_type == AP4_AVC_NAL_UNIT_TYPE_CODED_SLICE_OF_NON_IDR_PICTURE ||
        nal_unit_type == AP4_AVC_NAL_UNIT_TYPE_CODED_SLICE_OF_IDR_PICTURE //||
        //nal_unit_type == AP4_AVC_NAL_UNIT_TYPE_CODED_SLICE_DATA_PARTITION_A ||
        //nal_unit_type == AP4_AVC_NAL_UNIT_TYPE_CODED_SLICE_DATA_PARTITION_B ||
        //nal_unit_type == AP4_AVC_NAL_UNIT_TYPE_CODED_SLICE_DATA_PARTITION_C
      ) {

        AP4_DataBuffer unescaped(data, data_size);
        AP4_NalParser::Unescape(unescaped);
        AP4_BitReader bits(unescaped.GetData(), unescaped.GetDataSize());

        bits.SkipBits(8); // NAL Unit Type

        AP4_AvcFrameParser::ReadGolomb(bits); // first_mb_in_slice
        AP4_AvcFrameParser::ReadGolomb(bits); // slice_type
        pictureId = AP4_AvcFrameParser::ReadGolomb(bits); //picture_set_id
      }
      // move to the next NAL unit
      data += nalu_size;
      data_size -= nalu_size;
    }
  }

/*----------------------------------------------------------------------
|   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
//.........这里部分代码省略.........

/*----------------------------------------------------------------------
|   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;
}