[Jarvis] partly backport of PR 9231 to fix segfault

This patch is a backport of
xbmc@a81208e
to fix a segfault during playback of vaapi-accelerated mpeg2 content:

terminate called after throwing an instance of 'std::logic_error'
  what():  basic_string::_S_construct null not valid
[New LWP 3743]

Program received signal SIGABRT, Aborted.
[Switching to LWP 3743]
0xb5664a9b in raise () from /lib/libc.so.0
(gdb) bt full
#0  0xb5664a9b in raise () from /lib/libc.so.0
No symbol table info available.
#1  0xb5660520 in abort () from /lib/libc.so.0
No symbol table info available.
#2  0xb56e6536 in __gnu_cxx::__verbose_terminate_handler() () from /usr/lib/libstdc++.so.6
No symbol table info available.
#3  0xb56e4a1c in ?? () from /usr/lib/libstdc++.so.6
No symbol table info available.
#4  0xb56e4a80 in std::terminate() () from /usr/lib/libstdc++.so.6
No symbol table info available.
#5  0xb56e4cc9 in __cxa_throw () from /usr/lib/libstdc++.so.6
No symbol table info available.
#6  0xb5719d79 in std::__throw_logic_error(char const*) () from /usr/lib/libstdc++.so.6
No symbol table info available.
#7  0xb5722c41 in char* std::string::_S_construct<char const*>(char const*, char const*, std::allocator<char> const&, std::forward_iterator_tag) () from /usr/lib/libstdc++.so.6
No symbol table info available.
#8  0xb5722cc7 in std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string(char const*, std::allocator<char> const&) () from /usr/lib/libstdc++.so.6
No symbol table info available.
#9  0x0848fea3 in CDVDVideoCodec::IsCodecDisabled (map=0x9130420 <g_vaapi_available>, size=5, id=AV_CODEC_ID_MPEG4)
    at DVDVideoCodec.cpp:75
        index = <optimized out>
#10 0x08499d04 in VAAPI::CDecoder::Open (this=0xd09e5e8, avctx=0xd6a2ec0, mainctx=0xd6a2ec0, fmt=AV_PIX_FMT_VAAPI_VLD,
    surfaces=6) at VAAPI.cpp:503
        gpuvendor = {static npos = <optimized out>,
          _M_dataplus = {<std::allocator<char>> = {<__gnu_cxx::new_allocator<char>> = {<No data fields>}, <No data fields>}, _M_p = 0xceb267c "intel open source technology center"}}
        profile = <optimized out>
#11 0x08491bda in CDVDVideoCodecFFmpeg::GetFormat (avctx=0xd6a2ec0, fmt=0x986d9c0) at DVDVideoCodecFFmpeg.cpp:143
        dec = 0xd09e5e8
        ctx = <optimized out>
        cur = 0x986d9c0
#12 0xb61c8ced in ?? () from /usr/lib/libavcodec.so.56

Author: bkuhls

xbmc/cores/dvdplayer/DVDCodecs/Video/DVDVideoCodec.cpp

@@ -60,19 +60,15 @@ bool CDVDVideoCodec::IsSettingVisible(const std::string &condition, const std::s
   return true;
 }
 
-bool CDVDVideoCodec::IsCodecDisabled(DVDCodecAvailableType* map, unsigned int size, AVCodecID id)
+bool CDVDVideoCodec::IsCodecDisabled(const std::map<AVCodecID, std::string> &map, AVCodecID id)
 {
-  int index = -1;
-  for (unsigned int i = 0; i < size; ++i)
+  auto codec = map.find(id);
+  if (codec != map.end())
   {
-    if(map[i].codec == id)
-    {
-      index = (int) i;
-      break;
-    }
+    return (!CSettings::GetInstance().GetBool(codec->second) ||
+            !CDVDVideoCodec::IsSettingVisible("unused", "unused",
+                                              CSettings::GetInstance().GetSetting(codec->second),
+                                              NULL));
   }
-  if(index > -1)
-    return (!CSettings::GetInstance().GetBool(map[index].setting) || !CDVDVideoCodec::IsSettingVisible("unused", "unused", CSettings::GetInstance().GetSetting(map[index].setting), NULL));
-
   return false; //don't disable what we don't have
 }

xbmc/cores/dvdplayer/DVDCodecs/Video/DVDVideoCodec.h

@@ -24,6 +24,7 @@
 
 #include <vector>
 #include <string>
+#include <map>
 #include "cores/VideoRenderers/RenderFormats.h"
 
 
@@ -34,12 +35,6 @@ extern "C" {
 
 class CSetting;
 
-struct DVDCodecAvailableType 
-{
-  AVCodecID codec;
-  const char* setting;
-};
-
 // when modifying these structures, make sure you update all codecs accordingly
 #define FRAME_TYPE_UNDEF 0
 #define FRAME_TYPE_I 1
@@ -290,7 +285,7 @@ class CDVDVideoCodec
   /**
   * Interact with user settings so that user disabled codecs are disabled
   */
-  static bool IsCodecDisabled(DVDCodecAvailableType* map, unsigned int size, AVCodecID id);
+  static bool IsCodecDisabled(const std::map<AVCodecID, std::string> &map, AVCodecID id);
 
    /* For calculation of dropping requirements player asks for some information.
    *

xbmc/cores/dvdplayer/DVDCodecs/Video/VAAPI.cpp

@@ -451,16 +451,6 @@ bool CVideoSurfaces::HasRefs()
 // VAAPI
 //-----------------------------------------------------------------------------
 
-// settings codecs mapping
-DVDCodecAvailableType g_vaapi_available[] = {
-  { AV_CODEC_ID_H263, CSettings::SETTING_VIDEOPLAYER_USEVAAPIMPEG4.c_str() },
-  { AV_CODEC_ID_MPEG4, CSettings::SETTING_VIDEOPLAYER_USEVAAPIMPEG4.c_str() },
-  { AV_CODEC_ID_WMV3, CSettings::SETTING_VIDEOPLAYER_USEVAAPIVC1.c_str() },
-  { AV_CODEC_ID_VC1, CSettings::SETTING_VIDEOPLAYER_USEVAAPIVC1.c_str() },
-  { AV_CODEC_ID_MPEG2VIDEO, CSettings::SETTING_VIDEOPLAYER_USEVAAPIMPEG2.c_str() },
-};
-const size_t settings_count = sizeof(g_vaapi_available) / sizeof(DVDCodecAvailableType);
-
 CDecoder::CDecoder() : m_vaapiOutput(&m_inMsgEvent)
 {
   m_vaapiConfig.videoSurfaces = &m_videoSurfaces;
@@ -500,7 +490,14 @@ bool CDecoder::Open(AVCodecContext* avctx, AVCodecContext* mainctx, const enum P
   }
 
   // check if user wants to decode this format with VAAPI
-  if (CDVDVideoCodec::IsCodecDisabled(g_vaapi_available, settings_count, avctx->codec_id))
+  std::map<AVCodecID, std::string> settings_map = {
+    { AV_CODEC_ID_H263, CSettings::SETTING_VIDEOPLAYER_USEVAAPIMPEG4 },
+    { AV_CODEC_ID_MPEG4, CSettings::SETTING_VIDEOPLAYER_USEVAAPIMPEG4 },
+    { AV_CODEC_ID_WMV3, CSettings::SETTING_VIDEOPLAYER_USEVAAPIVC1 },
+    { AV_CODEC_ID_VC1, CSettings::SETTING_VIDEOPLAYER_USEVAAPIVC1 },
+    { AV_CODEC_ID_MPEG2VIDEO, CSettings::SETTING_VIDEOPLAYER_USEVAAPIMPEG2 },
+  };
+  if (CDVDVideoCodec::IsCodecDisabled(settings_map, avctx->codec_id))
     return false;
 
   if (g_advancedSettings.CanLogComponent(LOGVIDEO))

xbmc/cores/dvdplayer/DVDCodecs/Video/VDPAU.cpp

@@ -45,16 +45,6 @@ using namespace VDPAU;
 
 #define ARSIZE(x) (sizeof(x) / sizeof((x)[0]))
 
-// settings codecs mapping
-DVDCodecAvailableType g_vdpau_available[] = {
-  { AV_CODEC_ID_H263, CSettings::SETTING_VIDEOPLAYER_USEVDPAUMPEG4.c_str() },
-  { AV_CODEC_ID_MPEG4, CSettings::SETTING_VIDEOPLAYER_USEVDPAUMPEG4.c_str() },
-  { AV_CODEC_ID_WMV3, CSettings::SETTING_VIDEOPLAYER_USEVDPAUVC1.c_str() },
-  { AV_CODEC_ID_VC1, CSettings::SETTING_VIDEOPLAYER_USEVDPAUVC1.c_str() },
-  { AV_CODEC_ID_MPEG2VIDEO, CSettings::SETTING_VIDEOPLAYER_USEVDPAUMPEG2.c_str() },
-};
-const size_t settings_count = sizeof(g_vdpau_available) / sizeof(DVDCodecAvailableType);
-
 CDecoder::Desc decoder_profiles[] = {
 {"MPEG1",        VDP_DECODER_PROFILE_MPEG1},
 {"MPEG2_SIMPLE", VDP_DECODER_PROFILE_MPEG2_SIMPLE},
@@ -494,7 +484,14 @@ bool CDecoder::Open(AVCodecContext* avctx, AVCodecContext* mainctx, const enum P
   // nvidia is whitelisted despite for mpeg-4 we need to query user settings
   if ((gpuvendor.compare(0, 6, "nvidia") != 0)  || (avctx->codec_id == AV_CODEC_ID_MPEG4) || (avctx->codec_id == AV_CODEC_ID_H263))
   {
-    if (CDVDVideoCodec::IsCodecDisabled(g_vdpau_available, settings_count, avctx->codec_id))
+    std::map<AVCodecID, std::string> settings_map = {
+      { AV_CODEC_ID_H263, CSettings::SETTING_VIDEOPLAYER_USEVDPAUMPEG4 },
+      { AV_CODEC_ID_MPEG4, CSettings::SETTING_VIDEOPLAYER_USEVDPAUMPEG4 },
+      { AV_CODEC_ID_WMV3, CSettings::SETTING_VIDEOPLAYER_USEVDPAUVC1 },
+      { AV_CODEC_ID_VC1, CSettings::SETTING_VIDEOPLAYER_USEVDPAUVC1 },
+      { AV_CODEC_ID_MPEG2VIDEO, CSettings::SETTING_VIDEOPLAYER_USEVDPAUMPEG2 },
+    };
+    if (CDVDVideoCodec::IsCodecDisabled(settings_map, avctx->codec_id))
       return false;
   }