shithub: libvpx

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Add GetVectorData()

It's necessary to get data pointer from a vector sometimes.
This function will guarantee that the data pointer is nullptr
if the vector is empty.

Change-Id: I156308bcb193fe404452d3cd3b24b3f80c3c3727

--- a/vp9/simple_encode.cc

+++ b/vp9/simple_encode.cc

@@ -789,6 +789,14 @@

   external_arf_indexes_ = external_arf_indexes;

 }

+template <typename T>

+T *GetVectorData(const std::vector<T> &v) {

+  if (v.empty()) {

+    return nullptr;

+  }

+  return const_cast<T *>(v.data());

+}

+

 void SimpleEncode::StartEncode() {

   assert(impl_ptr_->first_pass_stats.size() > 0);

   vpx_rational_t frame_rate =

@@ -797,7 +805,7 @@

       vp9_get_encoder_config(frame_width_, frame_height_, frame_rate,

                              target_bitrate_, VPX_RC_LAST_PASS);

   vpx_fixed_buf_t stats;

-  stats.buf = impl_ptr_->first_pass_stats.data();

+  stats.buf = GetVectorData(impl_ptr_->first_pass_stats);

   stats.sz = sizeof(impl_ptr_->first_pass_stats[0]) *

              impl_ptr_->first_pass_stats.size();

@@ -808,7 +816,7 @@

                 frame_height_, 1);

   frame_coding_index_ = 0;

   encode_command_set_external_arf_indexes(&impl_ptr_->cpi->encode_command,

-                                          external_arf_indexes_.data());

+                                          GetVectorData(external_arf_indexes_));

   UpdateGroupOfPicture(impl_ptr_->cpi, frame_coding_index_, ref_frame_info_,

                        &group_of_picture_);

   rewind(in_file_);

@@ -952,7 +960,8 @@

                              target_bitrate_, VPX_RC_LAST_PASS);

   FRAME_INFO frame_info = vp9_get_frame_info(&oxcf);

   FIRST_PASS_INFO first_pass_info;

-  fps_init_first_pass_info(&first_pass_info, impl_ptr_->first_pass_stats.data(),

+  fps_init_first_pass_info(&first_pass_info,

+                           GetVectorData(impl_ptr_->first_pass_stats),

                            num_frames_);

   return vp9_get_coding_frame_num(external_arf_indexes_.data(), &oxcf,

                                   &frame_info, &first_pass_info,