1 files changed, 1219 insertions, 0 deletions

diff --git a/xbmc/utils/BitstreamConverter.cpp b/xbmc/utils/BitstreamConverter.cpp
new file mode 100644
index 0000000..011a1e4
--- /dev/null
+++ b/xbmc/utils/BitstreamConverter.cpp
@@ -0,0 +1,1219 @@
+/*
+ *  Copyright (C) 2010-2018 Team Kodi
+ *  This file is part of Kodi - https://kodi.tv
+ *
+ *  SPDX-License-Identifier: GPL-2.0-or-later
+ *  See LICENSES/README.md for more information.
+ */
+
+#include "utils/log.h"
+
+#include <assert.h>
+
+#ifndef UINT16_MAX
+#define UINT16_MAX             (65535U)
+#endif
+
+#include "BitstreamConverter.h"
+#include "BitstreamReader.h"
+#include "BitstreamWriter.h"
+
+#include <algorithm>
+
+enum {
+  AVC_NAL_SLICE=1,
+  AVC_NAL_DPA,
+  AVC_NAL_DPB,
+  AVC_NAL_DPC,
+  AVC_NAL_IDR_SLICE,
+  AVC_NAL_SEI,
+  AVC_NAL_SPS,
+  AVC_NAL_PPS,
+  AVC_NAL_AUD,
+  AVC_NAL_END_SEQUENCE,
+  AVC_NAL_END_STREAM,
+  AVC_NAL_FILLER_DATA,
+  AVC_NAL_SPS_EXT,
+  AVC_NAL_AUXILIARY_SLICE=19
+};
+
+enum {
+  HEVC_NAL_TRAIL_N    = 0,
+  HEVC_NAL_TRAIL_R    = 1,
+  HEVC_NAL_TSA_N      = 2,
+  HEVC_NAL_TSA_R      = 3,
+  HEVC_NAL_STSA_N     = 4,
+  HEVC_NAL_STSA_R     = 5,
+  HEVC_NAL_RADL_N     = 6,
+  HEVC_NAL_RADL_R     = 7,
+  HEVC_NAL_RASL_N     = 8,
+  HEVC_NAL_RASL_R     = 9,
+  HEVC_NAL_BLA_W_LP   = 16,
+  HEVC_NAL_BLA_W_RADL = 17,
+  HEVC_NAL_BLA_N_LP   = 18,
+  HEVC_NAL_IDR_W_RADL = 19,
+  HEVC_NAL_IDR_N_LP   = 20,
+  HEVC_NAL_CRA_NUT    = 21,
+  HEVC_NAL_VPS        = 32,
+  HEVC_NAL_SPS        = 33,
+  HEVC_NAL_PPS        = 34,
+  HEVC_NAL_AUD        = 35,
+  HEVC_NAL_EOS_NUT    = 36,
+  HEVC_NAL_EOB_NUT    = 37,
+  HEVC_NAL_FD_NUT     = 38,
+  HEVC_NAL_SEI_PREFIX = 39,
+  HEVC_NAL_SEI_SUFFIX = 40
+};
+
+enum {
+  SEI_BUFFERING_PERIOD = 0,
+  SEI_PIC_TIMING,
+  SEI_PAN_SCAN_RECT,
+  SEI_FILLER_PAYLOAD,
+  SEI_USER_DATA_REGISTERED_ITU_T_T35,
+  SEI_USER_DATA_UNREGISTERED,
+  SEI_RECOVERY_POINT,
+  SEI_DEC_REF_PIC_MARKING_REPETITION,
+  SEI_SPARE_PIC,
+  SEI_SCENE_INFO,
+  SEI_SUB_SEQ_INFO,
+  SEI_SUB_SEQ_LAYER_CHARACTERISTICS,
+  SEI_SUB_SEQ_CHARACTERISTICS,
+  SEI_FULL_FRAME_FREEZE,
+  SEI_FULL_FRAME_FREEZE_RELEASE,
+  SEI_FULL_FRAME_SNAPSHOT,
+  SEI_PROGRESSIVE_REFINEMENT_SEGMENT_START,
+  SEI_PROGRESSIVE_REFINEMENT_SEGMENT_END,
+  SEI_MOTION_CONSTRAINED_SLICE_GROUP_SET,
+  SEI_FILM_GRAIN_CHARACTERISTICS,
+  SEI_DEBLOCKING_FILTER_DISPLAY_PREFERENCE,
+  SEI_STEREO_VIDEO_INFO,
+  SEI_POST_FILTER_HINTS,
+  SEI_TONE_MAPPING
+};
+
+/*
+ *  GStreamer h264 parser
+ *  Copyright (C) 2005 Michal Benes <michal.benes@itonis.tv>
+ *            (C) 2008 Wim Taymans <wim.taymans@gmail.com>
+ *  gsth264parse.c
+ *  
+ *  SPDX-License-Identifier: LGPL-2.1-or-later
+ *  See LICENSES/README.md for more information.
+ */
+static void nal_bs_init(nal_bitstream *bs, const uint8_t *data, size_t size)
+{
+  bs->data = data;
+  bs->end  = data + size;
+  bs->head = 0;
+  // fill with something other than 0 to detect
+  //  emulation prevention bytes
+  bs->cache = 0xffffffff;
+}
+
+static uint32_t nal_bs_read(nal_bitstream *bs, int n)
+{
+  uint32_t res = 0;
+  int shift;
+
+  if (n == 0)
+    return res;
+
+  // fill up the cache if we need to
+  while (bs->head < n)
+  {
+    uint8_t a_byte;
+    bool check_three_byte;
+
+    check_three_byte = true;
+next_byte:
+    if (bs->data >= bs->end)
+    {
+      // we're at the end, can't produce more than head number of bits
+      n = bs->head;
+      break;
+    }
+    // get the byte, this can be an emulation_prevention_three_byte that we need
+    // to ignore.
+    a_byte = *bs->data++;
+    if (check_three_byte && a_byte == 0x03 && ((bs->cache & 0xffff) == 0))
+    {
+      // next byte goes unconditionally to the cache, even if it's 0x03
+      check_three_byte = false;
+      goto next_byte;
+    }
+    // shift bytes in cache, moving the head bits of the cache left
+    bs->cache = (bs->cache << 8) | a_byte;
+    bs->head += 8;
+  }
+
+  // bring the required bits down and truncate
+  if ((shift = bs->head - n) > 0)
+    res = static_cast<uint32_t>(bs->cache >> shift);
+  else
+    res = static_cast<uint32_t>(bs->cache);
+
+  // mask out required bits
+  if (n < 32)
+    res &= (1 << n) - 1;
+  bs->head = shift;
+
+  return res;
+}
+
+static bool nal_bs_eos(nal_bitstream *bs)
+{
+  return (bs->data >= bs->end) && (bs->head == 0);
+}
+
+// read unsigned Exp-Golomb code
+static int nal_bs_read_ue(nal_bitstream *bs)
+{
+  int i = 0;
+
+  while (nal_bs_read(bs, 1) == 0 && !nal_bs_eos(bs) && i < 31)
+    i++;
+
+  return ((1 << i) - 1 + nal_bs_read(bs, i));
+}
+
+static const uint8_t* avc_find_startcode_internal(const uint8_t *p, const uint8_t *end)
+{
+  const uint8_t *a = p + 4 - ((intptr_t)p & 3);
+
+  for (end -= 3; p < a && p < end; p++)
+  {
+    if (p[0] == 0 && p[1] == 0 && p[2] == 1)
+      return p;
+  }
+
+  for (end -= 3; p < end; p += 4)
+  {
+    uint32_t x = *(const uint32_t*)p;
+    if ((x - 0x01010101) & (~x) & 0x80808080) // generic
+    {
+      if (p[1] == 0)
+      {
+        if (p[0] == 0 && p[2] == 1)
+          return p;
+        if (p[2] == 0 && p[3] == 1)
+          return p+1;
+      }
+      if (p[3] == 0)
+      {
+        if (p[2] == 0 && p[4] == 1)
+          return p+2;
+        if (p[4] == 0 && p[5] == 1)
+          return p+3;
+      }
+    }
+  }
+
+  for (end += 3; p < end; p++)
+  {
+    if (p[0] == 0 && p[1] == 0 && p[2] == 1)
+      return p;
+  }
+
+  return end + 3;
+}
+
+static const uint8_t* avc_find_startcode(const uint8_t *p, const uint8_t *end)
+{
+  const uint8_t *out = avc_find_startcode_internal(p, end);
+  if (p<out && out<end && !out[-1])
+    out--;
+  return out;
+}
+
+static bool has_sei_recovery_point(const uint8_t *p, const uint8_t *end)
+{
+  int pt(0), ps(0), offset(1);
+
+  do
+  {
+    pt = 0;
+    do {
+      pt += p[offset];
+    } while (p[offset++] == 0xFF);
+
+    ps = 0;
+    do {
+      ps += p[offset];
+    } while (p[offset++] == 0xFF);
+
+    if (pt == SEI_RECOVERY_POINT)
+    {
+      nal_bitstream bs;
+      nal_bs_init(&bs, p + offset, ps);
+      return nal_bs_read_ue(&bs) >= 0;
+    }
+    offset += ps;
+  } while (p + offset < end && p[offset] != 0x80);
+
+  return false;
+}
+
+////////////////////////////////////////////////////////////////////////////////////////////
+/////////////////////////////////////////////////////////////////////////////////////////////
+CBitstreamParser::CBitstreamParser() = default;
+
+CBitstreamParser::~CBitstreamParser() = default;
+
+void CBitstreamParser::Close()
+{
+}
+
+bool CBitstreamParser::CanStartDecode(const uint8_t *buf, int buf_size)
+{
+  if (!buf)
+    return false;
+
+  bool rtn = false;
+  uint32_t state = -1;
+  const uint8_t *buf_begin, *buf_end = buf + buf_size;
+
+  for (; rtn == false;)
+  {
+    buf = find_start_code(buf, buf_end, &state);
+    if (buf >= buf_end)
+    {
+      break;
+    }
+
+    switch (state & 0x1f)
+    {
+    case AVC_NAL_SLICE:
+      break;
+    case AVC_NAL_IDR_SLICE:
+      rtn = true;
+      break;
+    case AVC_NAL_SEI:
+      buf_begin = buf - 1;
+      buf = find_start_code(buf, buf_end, &state) - 4;
+      if (has_sei_recovery_point(buf_begin, buf))
+        rtn = true;
+      break;
+    case AVC_NAL_SPS:
+      rtn = true;
+      break;
+    case AVC_NAL_PPS:
+      break;
+    default:
+      break;
+    }
+  }
+
+  return rtn;
+}
+
+////////////////////////////////////////////////////////////////////////////////////////////
+/////////////////////////////////////////////////////////////////////////////////////////////
+CBitstreamConverter::CBitstreamConverter()
+{
+  m_convert_bitstream = false;
+  m_convertBuffer     = NULL;
+  m_convertSize       = 0;
+  m_inputBuffer       = NULL;
+  m_inputSize         = 0;
+  m_to_annexb         = false;
+  m_extradata         = NULL;
+  m_extrasize         = 0;
+  m_convert_3byteTo4byteNALSize = false;
+  m_convert_bytestream = false;
+  m_sps_pps_context.sps_pps_data = NULL;
+  m_start_decode = true;
+}
+
+CBitstreamConverter::~CBitstreamConverter()
+{
+  Close();
+}
+
+bool CBitstreamConverter::Open(enum AVCodecID codec, uint8_t *in_extradata, int in_extrasize, bool to_annexb)
+{
+  m_to_annexb = to_annexb;
+
+  m_codec = codec;
+  switch(m_codec)
+  {
+    case AV_CODEC_ID_H264:
+      if (in_extrasize < 7 || in_extradata == NULL)
+      {
+        CLog::Log(LOGERROR, "CBitstreamConverter::Open avcC data too small or missing");
+        return false;
+      }
+      // valid avcC data (bitstream) always starts with the value 1 (version)
+      if(m_to_annexb)
+      {
+        if ( in_extradata[0] == 1 )
+        {
+          CLog::Log(LOGINFO, "CBitstreamConverter::Open bitstream to annexb init");
+          m_extrasize = in_extrasize;
+          m_extradata = (uint8_t*)av_malloc(in_extrasize);
+          memcpy(m_extradata, in_extradata, in_extrasize);
+          m_convert_bitstream = BitstreamConvertInitAVC(m_extradata, m_extrasize);
+          return true;
+        }
+        else
+          CLog::Log(LOGINFO, "CBitstreamConverter::Open Invalid avcC");
+      }
+      else
+      {
+        // valid avcC atom data always starts with the value 1 (version)
+        if ( in_extradata[0] != 1 )
+        {
+          if ( (in_extradata[0] == 0 && in_extradata[1] == 0 && in_extradata[2] == 0 && in_extradata[3] == 1) ||
+               (in_extradata[0] == 0 && in_extradata[1] == 0 && in_extradata[2] == 1) )
+          {
+            CLog::Log(LOGINFO, "CBitstreamConverter::Open annexb to bitstream init");
+            // video content is from x264 or from bytestream h264 (AnnexB format)
+            // NAL reformating to bitstream format needed
+            AVIOContext *pb;
+            if (avio_open_dyn_buf(&pb) < 0)
+              return false;
+            m_convert_bytestream = true;
+            // create a valid avcC atom data from ffmpeg's extradata
+            isom_write_avcc(pb, in_extradata, in_extrasize);
+            // unhook from ffmpeg's extradata
+            in_extradata = NULL;
+            // extract the avcC atom data into extradata then write it into avcCData for VDADecoder
+            in_extrasize = avio_close_dyn_buf(pb, &in_extradata);
+            // make a copy of extradata contents
+            m_extradata = (uint8_t *)av_malloc(in_extrasize);
+            memcpy(m_extradata, in_extradata, in_extrasize);
+            m_extrasize = in_extrasize;
+            // done with the converted extradata, we MUST free using av_free
+            av_free(in_extradata);
+            return true;
+          }
+          else
+          {
+            CLog::Log(LOGINFO, "CBitstreamConverter::Open invalid avcC atom data");
+            return false;
+          }
+        }
+        else
+        {
+          if (in_extradata[4] == 0xFE)
+          {
+            CLog::Log(LOGINFO, "CBitstreamConverter::Open annexb to bitstream init 3 byte to 4 byte nal");
+            // video content is from so silly encoder that think 3 byte NAL sizes
+            // are valid, setup to convert 3 byte NAL sizes to 4 byte.
+            in_extradata[4] = 0xFF;
+            m_convert_3byteTo4byteNALSize = true;
+
+            m_extradata = (uint8_t *)av_malloc(in_extrasize);
+            memcpy(m_extradata, in_extradata, in_extrasize);
+            m_extrasize = in_extrasize;
+            return true;
+          }
+        }
+        // valid avcC atom
+        m_extradata = (uint8_t*)av_malloc(in_extrasize);
+        memcpy(m_extradata, in_extradata, in_extrasize);
+        m_extrasize = in_extrasize;
+        return true;
+      }
+      return false;
+      break;
+    case AV_CODEC_ID_HEVC:
+      if (in_extrasize < 23 || in_extradata == NULL)
+      {
+        CLog::Log(LOGERROR, "CBitstreamConverter::Open hvcC data too small or missing");
+        return false;
+      }
+      // valid hvcC data (bitstream) always starts with the value 1 (version)
+      if(m_to_annexb)
+      {
+       /**
+        * It seems the extradata is encoded as hvcC format.
+        * Temporarily, we support configurationVersion==0 until 14496-15 3rd
+        * is finalized. When finalized, configurationVersion will be 1 and we
+        * can recognize hvcC by checking if extradata[0]==1 or not.
+        */
+
+        if (in_extradata[0] || in_extradata[1] || in_extradata[2] > 1)
+        {
+          CLog::Log(LOGINFO, "CBitstreamConverter::Open bitstream to annexb init");
+          m_extrasize = in_extrasize;
+          m_extradata = (uint8_t*)av_malloc(in_extrasize);
+          memcpy(m_extradata, in_extradata, in_extrasize);
+          m_convert_bitstream = BitstreamConvertInitHEVC(m_extradata, m_extrasize);
+          return true;
+        }
+        else
+          CLog::Log(LOGINFO, "CBitstreamConverter::Open Invalid hvcC");
+      }
+      else
+      {
+        // valid hvcC atom data always starts with the value 1 (version)
+        if ( in_extradata[0] != 1 )
+        {
+          if ( (in_extradata[0] == 0 && in_extradata[1] == 0 && in_extradata[2] == 0 && in_extradata[3] == 1) ||
+               (in_extradata[0] == 0 && in_extradata[1] == 0 && in_extradata[2] == 1) )
+          {
+            CLog::Log(LOGINFO, "CBitstreamConverter::Open annexb to bitstream init");
+            //! @todo convert annexb to bitstream format
+            return false;
+          }
+          else
+          {
+            CLog::Log(LOGINFO, "CBitstreamConverter::Open invalid hvcC atom data");
+            return false;
+          }
+        }
+        else
+        {
+          if ((in_extradata[4] & 0x3) == 2)
+          {
+            CLog::Log(LOGINFO, "CBitstreamConverter::Open annexb to bitstream init 3 byte to 4 byte nal");
+            // video content is from so silly encoder that think 3 byte NAL sizes
+            // are valid, setup to convert 3 byte NAL sizes to 4 byte.
+            in_extradata[4] |= 0x03;
+            m_convert_3byteTo4byteNALSize = true;
+          }
+        }
+        // valid hvcC atom
+        m_extradata = (uint8_t*)av_malloc(in_extrasize);
+        memcpy(m_extradata, in_extradata, in_extrasize);
+        m_extrasize = in_extrasize;
+        return true;
+      }
+      return false;
+      break;
+    default:
+      return false;
+      break;
+  }
+  return false;
+}
+
+void CBitstreamConverter::Close(void)
+{
+  if (m_sps_pps_context.sps_pps_data)
+    av_free(m_sps_pps_context.sps_pps_data), m_sps_pps_context.sps_pps_data = NULL;
+
+  if (m_convertBuffer)
+    av_free(m_convertBuffer), m_convertBuffer = NULL;
+  m_convertSize = 0;
+
+  if (m_extradata)
+    av_free(m_extradata), m_extradata = NULL;
+  m_extrasize = 0;
+
+  m_inputSize = 0;
+  m_inputBuffer = NULL;
+
+  m_convert_bitstream = false;
+  m_convert_bytestream = false;
+  m_convert_3byteTo4byteNALSize = false;
+}
+
+bool CBitstreamConverter::Convert(uint8_t *pData, int iSize)
+{
+  if (m_convertBuffer)
+  {
+    av_free(m_convertBuffer);
+    m_convertBuffer = NULL;
+  }
+  m_inputSize = 0;
+  m_convertSize = 0;
+  m_inputBuffer = NULL;
+
+  if (pData)
+  {
+    if (m_codec == AV_CODEC_ID_H264 ||
+        m_codec == AV_CODEC_ID_HEVC)
+    {
+      if (m_to_annexb)
+      {
+        int demuxer_bytes = iSize;
+        uint8_t *demuxer_content = pData;
+
+        if (m_convert_bitstream)
+        {
+          // convert demuxer packet from bitstream to bytestream (AnnexB)
+          int bytestream_size = 0;
+          uint8_t *bytestream_buff = NULL;
+
+          BitstreamConvert(demuxer_content, demuxer_bytes, &bytestream_buff, &bytestream_size);
+          if (bytestream_buff && (bytestream_size > 0))
+          {
+            m_convertSize   = bytestream_size;
+            m_convertBuffer = bytestream_buff;
+            return true;
+          }
+          else
+          {
+            m_convertSize = 0;
+            m_convertBuffer = NULL;
+            CLog::Log(LOGERROR, "CBitstreamConverter::Convert: error converting.");
+            return false;
+          }
+        }
+        else
+        {
+          m_inputSize = iSize;
+          m_inputBuffer = pData;
+          return true;
+        }
+      }
+      else
+      {
+        m_inputSize = iSize;
+        m_inputBuffer = pData;
+
+        if (m_convert_bytestream)
+        {
+          if(m_convertBuffer)
+          {
+            av_free(m_convertBuffer);
+            m_convertBuffer = NULL;
+          }
+          m_convertSize = 0;
+
+          // convert demuxer packet from bytestream (AnnexB) to bitstream
+          AVIOContext *pb;
+
+          if(avio_open_dyn_buf(&pb) < 0)
+          {
+            return false;
+          }
+          m_convertSize = avc_parse_nal_units(pb, pData, iSize);
+          m_convertSize = avio_close_dyn_buf(pb, &m_convertBuffer);
+        }
+        else if (m_convert_3byteTo4byteNALSize)
+        {
+          if(m_convertBuffer)
+          {
+            av_free(m_convertBuffer);
+            m_convertBuffer = NULL;
+          }
+          m_convertSize = 0;
+
+          // convert demuxer packet from 3 byte NAL sizes to 4 byte
+          AVIOContext *pb;
+          if (avio_open_dyn_buf(&pb) < 0)
+            return false;
+
+          uint32_t nal_size;
+          uint8_t *end = pData + iSize;
+          uint8_t *nal_start = pData;
+          while (nal_start < end)
+          {
+            nal_size = BS_RB24(nal_start);
+            avio_wb32(pb, nal_size);
+            nal_start += 3;
+            avio_write(pb, nal_start, nal_size);
+            nal_start += nal_size;
+          }
+
+          m_convertSize = avio_close_dyn_buf(pb, &m_convertBuffer);
+        }
+        return true;
+      }
+    }
+  }
+
+  return false;
+}
+
+
+uint8_t *CBitstreamConverter::GetConvertBuffer() const
+{
+  if((m_convert_bitstream || m_convert_bytestream || m_convert_3byteTo4byteNALSize) && m_convertBuffer != NULL)
+    return m_convertBuffer;
+  else
+    return m_inputBuffer;
+}
+
+int CBitstreamConverter::GetConvertSize() const
+{
+  if((m_convert_bitstream || m_convert_bytestream || m_convert_3byteTo4byteNALSize) && m_convertBuffer != NULL)
+    return m_convertSize;
+  else
+    return m_inputSize;
+}
+
+uint8_t *CBitstreamConverter::GetExtraData() const
+{
+  if(m_convert_bitstream)
+    return m_sps_pps_context.sps_pps_data;
+  else
+    return m_extradata;
+}
+int CBitstreamConverter::GetExtraSize() const
+{
+  if(m_convert_bitstream)
+    return m_sps_pps_context.size;
+  else
+    return m_extrasize;
+}
+
+void CBitstreamConverter::ResetStartDecode(void)
+{
+  m_start_decode = false;
+}
+
+bool CBitstreamConverter::CanStartDecode() const
+{
+  return m_start_decode;
+}
+
+bool CBitstreamConverter::BitstreamConvertInitAVC(void *in_extradata, int in_extrasize)
+{
+  // based on h264_mp4toannexb_bsf.c (ffmpeg)
+  // which is Copyright (c) 2007 Benoit Fouet <benoit.fouet@free.fr>
+  // and Licensed GPL 2.1 or greater
+
+  m_sps_pps_size = 0;
+  m_sps_pps_context.sps_pps_data = NULL;
+
+  // nothing to filter
+  if (!in_extradata || in_extrasize < 6)
+    return false;
+
+  uint16_t unit_size;
+  uint32_t total_size = 0;
+  uint8_t *out = NULL, unit_nb, sps_done = 0, sps_seen = 0, pps_seen = 0;
+  const uint8_t *extradata = (uint8_t*)in_extradata + 4;
+  static const uint8_t nalu_header[4] = {0, 0, 0, 1};
+
+  // retrieve length coded size
+  m_sps_pps_context.length_size = (*extradata++ & 0x3) + 1;
+
+  // retrieve sps and pps unit(s)
+  unit_nb = *extradata++ & 0x1f;  // number of sps unit(s)
+  if (!unit_nb)
+  {
+    goto pps;
+  }
+  else
+  {
+    sps_seen = 1;
+  }
+
+  while (unit_nb--)
+  {
+    void *tmp;
+
+    unit_size = extradata[0] << 8 | extradata[1];
+    total_size += unit_size + 4;
+
+    if (total_size > INT_MAX - AV_INPUT_BUFFER_PADDING_SIZE ||
+      (extradata + 2 + unit_size) > ((uint8_t*)in_extradata + in_extrasize))
+    {
+      av_free(out);
+      return false;
+    }
+    tmp = av_realloc(out, total_size + AV_INPUT_BUFFER_PADDING_SIZE);
+    if (!tmp)
+    {
+      av_free(out);
+      return false;
+    }
+    out = (uint8_t*)tmp;
+    memcpy(out + total_size - unit_size - 4, nalu_header, 4);
+    memcpy(out + total_size - unit_size, extradata + 2, unit_size);
+    extradata += 2 + unit_size;
+
+pps:
+    if (!unit_nb && !sps_done++)
+    {
+      unit_nb = *extradata++;   // number of pps unit(s)
+      if (unit_nb)
+        pps_seen = 1;
+    }
+  }
+
+  if (out)
+    memset(out + total_size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
+
+  if (!sps_seen)
+      CLog::Log(LOGDEBUG, "SPS NALU missing or invalid. The resulting stream may not play");
+  if (!pps_seen)
+      CLog::Log(LOGDEBUG, "PPS NALU missing or invalid. The resulting stream may not play");
+
+  m_sps_pps_context.sps_pps_data = out;
+  m_sps_pps_context.size = total_size;
+  m_sps_pps_context.first_idr = 1;
+  m_sps_pps_context.idr_sps_pps_seen = 0;
+
+  return true;
+}
+
+bool CBitstreamConverter::BitstreamConvertInitHEVC(void *in_extradata, int in_extrasize)
+{
+  m_sps_pps_size = 0;
+  m_sps_pps_context.sps_pps_data = NULL;
+
+  // nothing to filter
+  if (!in_extradata || in_extrasize < 23)
+    return false;
+
+  uint16_t unit_nb, unit_size;
+  uint32_t total_size = 0;
+  uint8_t *out = NULL, array_nb, nal_type, sps_seen = 0, pps_seen = 0;
+  const uint8_t *extradata = (uint8_t*)in_extradata + 21;
+  static const uint8_t nalu_header[4] = {0, 0, 0, 1};
+
+  // retrieve length coded size
+  m_sps_pps_context.length_size = (*extradata++ & 0x3) + 1;
+
+  array_nb = *extradata++;
+  while (array_nb--)
+  {
+    nal_type = *extradata++ & 0x3f;
+    unit_nb  = extradata[0] << 8 | extradata[1];
+    extradata += 2;
+
+    if (nal_type == HEVC_NAL_SPS && unit_nb)
+    {
+        sps_seen = 1;
+    }
+    else if (nal_type == HEVC_NAL_PPS && unit_nb)
+    {
+        pps_seen = 1;
+    }
+    while (unit_nb--)
+    {
+      void *tmp;
+
+      unit_size = extradata[0] << 8 | extradata[1];
+      extradata += 2;
+      if (nal_type != HEVC_NAL_SPS &&
+          nal_type != HEVC_NAL_PPS &&
+          nal_type != HEVC_NAL_VPS)
+      {
+        extradata += unit_size;
+        continue;
+      }
+      total_size += unit_size + 4;
+
+      if (total_size > INT_MAX - AV_INPUT_BUFFER_PADDING_SIZE ||
+        (extradata + unit_size) > ((uint8_t*)in_extradata + in_extrasize))
+      {
+        av_free(out);
+        return false;
+      }
+      tmp = av_realloc(out, total_size + AV_INPUT_BUFFER_PADDING_SIZE);
+      if (!tmp)
+      {
+        av_free(out);
+        return false;
+      }
+      out = (uint8_t*)tmp;
+      memcpy(out + total_size - unit_size - 4, nalu_header, 4);
+      memcpy(out + total_size - unit_size, extradata, unit_size);
+      extradata += unit_size;
+    }
+  }
+
+  if (out)
+    memset(out + total_size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
+
+  if (!sps_seen)
+      CLog::Log(LOGDEBUG, "SPS NALU missing or invalid. The resulting stream may not play");
+  if (!pps_seen)
+      CLog::Log(LOGDEBUG, "PPS NALU missing or invalid. The resulting stream may not play");
+
+  m_sps_pps_context.sps_pps_data = out;
+  m_sps_pps_context.size = total_size;
+  m_sps_pps_context.first_idr = 1;
+  m_sps_pps_context.idr_sps_pps_seen = 0;
+
+  return true;
+}
+
+bool CBitstreamConverter::IsIDR(uint8_t unit_type)
+{
+  switch (m_codec)
+  {
+    case AV_CODEC_ID_H264:
+      return unit_type == AVC_NAL_IDR_SLICE;
+    case AV_CODEC_ID_HEVC:
+      return unit_type == HEVC_NAL_IDR_W_RADL ||
+             unit_type == HEVC_NAL_IDR_N_LP ||
+             unit_type == HEVC_NAL_CRA_NUT;
+    default:
+      return false;
+  }
+}
+
+bool CBitstreamConverter::IsSlice(uint8_t unit_type)
+{
+  switch (m_codec)
+  {
+    case AV_CODEC_ID_H264:
+      return unit_type == AVC_NAL_SLICE;
+    case AV_CODEC_ID_HEVC:
+      return unit_type == HEVC_NAL_TRAIL_R ||
+             unit_type == HEVC_NAL_TRAIL_N ||
+             unit_type == HEVC_NAL_TSA_N ||
+             unit_type == HEVC_NAL_TSA_R ||
+             unit_type == HEVC_NAL_STSA_N ||
+             unit_type == HEVC_NAL_STSA_R ||
+             unit_type == HEVC_NAL_BLA_W_LP ||
+             unit_type == HEVC_NAL_BLA_W_RADL ||
+             unit_type == HEVC_NAL_BLA_N_LP ||
+             unit_type == HEVC_NAL_CRA_NUT ||
+             unit_type == HEVC_NAL_RADL_N ||
+             unit_type == HEVC_NAL_RADL_R ||
+             unit_type == HEVC_NAL_RASL_N ||
+             unit_type == HEVC_NAL_RASL_R;
+    default:
+      return false;
+  }
+}
+
+bool CBitstreamConverter::BitstreamConvert(uint8_t* pData, int iSize, uint8_t **poutbuf, int *poutbuf_size)
+{
+  // based on h264_mp4toannexb_bsf.c (ffmpeg)
+  // which is Copyright (c) 2007 Benoit Fouet <benoit.fouet@free.fr>
+  // and Licensed GPL 2.1 or greater
+
+  int i;
+  uint8_t *buf = pData;
+  uint32_t buf_size = iSize;
+  uint8_t  unit_type, nal_sps, nal_pps, nal_sei;
+  int32_t  nal_size;
+  uint32_t cumul_size = 0;
+  const uint8_t *buf_end = buf + buf_size;
+
+  switch (m_codec)
+  {
+    case AV_CODEC_ID_H264:
+      nal_sps = AVC_NAL_SPS;
+      nal_pps = AVC_NAL_PPS;
+      nal_sei = AVC_NAL_SEI;
+      break;
+    case AV_CODEC_ID_HEVC:
+      nal_sps = HEVC_NAL_SPS;
+      nal_pps = HEVC_NAL_PPS;
+      nal_sei = HEVC_NAL_SEI_PREFIX;
+      break;
+    default:
+      return false;
+  }
+
+  do
+  {
+    if (buf + m_sps_pps_context.length_size > buf_end)
+      goto fail;
+
+    for (nal_size = 0, i = 0; i < m_sps_pps_context.length_size; i++)
+      nal_size = (nal_size << 8) | buf[i];
+
+    buf += m_sps_pps_context.length_size;
+    if (m_codec == AV_CODEC_ID_H264)
+    {
+        unit_type = *buf & 0x1f;
+    }
+    else
+    {
+        unit_type = (*buf >> 1) & 0x3f;
+    }
+
+    if (buf + nal_size > buf_end || nal_size <= 0)
+      goto fail;
+
+    // Don't add sps/pps if the unit already contain them
+    if (m_sps_pps_context.first_idr && (unit_type == nal_sps || unit_type == nal_pps))
+      m_sps_pps_context.idr_sps_pps_seen = 1;
+
+    if (!m_start_decode && (unit_type == nal_sps || IsIDR(unit_type) || (unit_type == nal_sei && has_sei_recovery_point(buf, buf + nal_size))))
+      m_start_decode = true;
+
+    // prepend only to the first access unit of an IDR picture, if no sps/pps already present
+    if (m_sps_pps_context.first_idr && IsIDR(unit_type) && !m_sps_pps_context.idr_sps_pps_seen)
+    {
+      BitstreamAllocAndCopy(poutbuf, poutbuf_size,
+        m_sps_pps_context.sps_pps_data, m_sps_pps_context.size, buf, nal_size);
+      m_sps_pps_context.first_idr = 0;
+    }
+    else
+    {
+      BitstreamAllocAndCopy(poutbuf, poutbuf_size, NULL, 0, buf, nal_size);
+      if (!m_sps_pps_context.first_idr && IsSlice(unit_type))
+      {
+          m_sps_pps_context.first_idr = 1;
+          m_sps_pps_context.idr_sps_pps_seen = 0;
+      }
+    }
+
+    buf += nal_size;
+    cumul_size += nal_size + m_sps_pps_context.length_size;
+  } while (cumul_size < buf_size);
+
+  return true;
+
+fail:
+  av_free(*poutbuf), *poutbuf = NULL;
+  *poutbuf_size = 0;
+  return false;
+}
+
+void CBitstreamConverter::BitstreamAllocAndCopy( uint8_t **poutbuf, int *poutbuf_size,
+    const uint8_t *sps_pps, uint32_t sps_pps_size, const uint8_t *in, uint32_t in_size)
+{
+  // based on h264_mp4toannexb_bsf.c (ffmpeg)
+  // which is Copyright (c) 2007 Benoit Fouet <benoit.fouet@free.fr>
+  // and Licensed GPL 2.1 or greater
+
+  uint32_t offset = *poutbuf_size;
+  uint8_t nal_header_size = offset ? 3 : 4;
+  void *tmp;
+
+  *poutbuf_size += sps_pps_size + in_size + nal_header_size;
+  tmp = av_realloc(*poutbuf, *poutbuf_size);
+  if (!tmp)
+    return;
+  *poutbuf = (uint8_t*)tmp;
+  if (sps_pps)
+    memcpy(*poutbuf + offset, sps_pps, sps_pps_size);
+
+  memcpy(*poutbuf + sps_pps_size + nal_header_size + offset, in, in_size);
+  if (!offset)
+  {
+    BS_WB32(*poutbuf + sps_pps_size, 1);
+  }
+  else
+  {
+    (*poutbuf + offset + sps_pps_size)[0] = 0;
+    (*poutbuf + offset + sps_pps_size)[1] = 0;
+    (*poutbuf + offset + sps_pps_size)[2] = 1;
+  }
+}
+
+int CBitstreamConverter::avc_parse_nal_units(AVIOContext *pb, const uint8_t *buf_in, int size)
+{
+  const uint8_t *p = buf_in;
+  const uint8_t *end = p + size;
+  const uint8_t *nal_start, *nal_end;
+
+  size = 0;
+  nal_start = avc_find_startcode(p, end);
+
+  for (;;) {
+    while (nal_start < end && !*(nal_start++));
+    if (nal_start == end)
+      break;
+
+    nal_end = avc_find_startcode(nal_start, end);
+    avio_wb32(pb, nal_end - nal_start);
+    avio_write(pb, nal_start, nal_end - nal_start);
+    size += 4 + nal_end - nal_start;
+    nal_start = nal_end;
+  }
+  return size;
+}
+
+int CBitstreamConverter::avc_parse_nal_units_buf(const uint8_t *buf_in, uint8_t **buf, int *size)
+{
+  AVIOContext *pb;
+  int ret = avio_open_dyn_buf(&pb);
+  if (ret < 0)
+    return ret;
+
+  avc_parse_nal_units(pb, buf_in, *size);
+
+  av_freep(buf);
+  *size = avio_close_dyn_buf(pb, buf);
+  return 0;
+}
+
+int CBitstreamConverter::isom_write_avcc(AVIOContext *pb, const uint8_t *data, int len)
+{
+  // extradata from bytestream h264, convert to avcC atom data for bitstream
+  if (len > 6)
+  {
+    /* check for h264 start code */
+    if (BS_RB32(data) == 0x00000001 || BS_RB24(data) == 0x000001)
+    {
+      uint8_t *buf=NULL, *end, *start;
+      uint32_t sps_size=0, pps_size=0;
+      uint8_t *sps=0, *pps=0;
+
+      int ret = avc_parse_nal_units_buf(data, &buf, &len);
+      if (ret < 0)
+        return ret;
+      start = buf;
+      end = buf + len;
+
+      /* look for sps and pps */
+      while (end - buf > 4)
+      {
+        uint32_t size;
+        uint8_t  nal_type;
+        size = std::min<uint32_t>(BS_RB32(buf), end - buf - 4);
+        buf += 4;
+        nal_type = buf[0] & 0x1f;
+        if (nal_type == 7) /* SPS */
+        {
+          sps = buf;
+          sps_size = size;
+        }
+        else if (nal_type == 8) /* PPS */
+        {
+          pps = buf;
+          pps_size = size;
+        }
+        buf += size;
+      }
+      if (!sps || !pps || sps_size < 4 || sps_size > UINT16_MAX || pps_size > UINT16_MAX)
+        assert(0);
+
+      avio_w8(pb, 1); /* version */
+      avio_w8(pb, sps[1]); /* profile */
+      avio_w8(pb, sps[2]); /* profile compat */
+      avio_w8(pb, sps[3]); /* level */
+      avio_w8(pb, 0xff); /* 6 bits reserved (111111) + 2 bits nal size length - 1 (11) */
+      avio_w8(pb, 0xe1); /* 3 bits reserved (111) + 5 bits number of sps (00001) */
+
+      avio_wb16(pb, sps_size);
+      avio_write(pb, sps, sps_size);
+      if (pps)
+      {
+        avio_w8(pb, 1); /* number of pps */
+        avio_wb16(pb, pps_size);
+        avio_write(pb, pps, pps_size);
+      }
+      av_free(start);
+    }
+    else
+    {
+      avio_write(pb, data, len);
+    }
+  }
+  return 0;
+}
+
+////////////////////////////////////////////////////////////////////////////////////////////
+/////////////////////////////////////////////////////////////////////////////////////////////
+bool CBitstreamConverter::mpeg2_sequence_header(const uint8_t *data, const uint32_t size, mpeg2_sequence *sequence)
+{
+  // parse nal's until a sequence_header_code is found
+  // and return the width, height, aspect ratio and frame rate if changed.
+  bool changed = false;
+
+  if (!data)
+    return changed;
+
+  const uint8_t *p = data;
+  const uint8_t *end = p + size;
+  const uint8_t *nal_start, *nal_end;
+
+  nal_start = avc_find_startcode(p, end);
+  while (nal_start < end)
+  {
+    while (!*(nal_start++));
+    nal_end = avc_find_startcode(nal_start, end);
+    if (*nal_start == 0xB3)
+    {
+      nal_bitstream bs;
+      nal_bs_init(&bs, nal_start, end - nal_start);
+
+      // sequence_header_code
+      nal_bs_read(&bs, 8);
+
+      // width
+      // nal_start + 12 bits == horizontal_size_value
+      uint32_t width = nal_bs_read(&bs, 12);
+      if (width != sequence->width)
+      {
+        changed = true;
+        sequence->width = width;
+      }
+      // height
+      // nal_start + 24 bits == vertical_size_value
+      uint32_t height = nal_bs_read(&bs, 12);
+      if (height != sequence->height)
+      {
+        changed = true;
+        sequence->height = height;
+      }
+
+      // aspect ratio
+      // nal_start + 28 bits == aspect_ratio_information
+      float ratio = sequence->ratio;
+      uint32_t ratio_info = nal_bs_read(&bs, 4);
+      switch(ratio_info)
+      {
+        case 0x01:
+          ratio = 1.0f;
+          break;
+        default:
+        case 0x02:
+          ratio = 4.0f/3;
+          break;
+        case 0x03:
+          ratio = 16.0f/9;
+          break;
+        case 0x04:
+          ratio = 2.21f;
+          break;
+      }
+      if (ratio_info != sequence->ratio_info)
+      {
+        changed = true;
+        sequence->ratio = ratio;
+        sequence->ratio_info = ratio_info;
+      }
+
+      // frame rate
+      // nal_start + 32 bits == frame_rate_code
+      uint32_t fpsrate = sequence->fps_rate;
+      uint32_t fpsscale = sequence->fps_scale;
+      uint32_t rate_info = nal_bs_read(&bs, 4);
+
+      switch(rate_info)
+      {
+        default:
+        case 0x01:
+          fpsrate = 24000;
+          fpsscale = 1001;
+          break;
+        case 0x02:
+          fpsrate = 24000;
+          fpsscale = 1000;
+          break;
+        case 0x03:
+          fpsrate = 25000;
+          fpsscale = 1000;
+          break;
+        case 0x04:
+          fpsrate = 30000;
+          fpsscale = 1001;
+          break;
+        case 0x05:
+          fpsrate = 30000;
+          fpsscale = 1000;
+          break;
+        case 0x06:
+          fpsrate = 50000;
+          fpsscale = 1000;
+          break;
+        case 0x07:
+          fpsrate = 60000;
+          fpsscale = 1001;
+          break;
+        case 0x08:
+          fpsrate = 60000;
+          fpsscale = 1000;
+          break;
+      }
+
+      if (fpsscale != sequence->fps_scale || fpsrate != sequence->fps_rate)
+      {
+        changed = true;
+        sequence->fps_rate = fpsrate;
+        sequence->fps_scale = fpsscale;
+      }
+    }
+    nal_start = nal_end;
+  }
+
+  return changed;
+}
+