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BitstreamConverter.cpp
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/*
* Copyright (C) 2010-2013 Team XBMC
* http://xbmc.org
*
* This Program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This Program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with XBMC; see the file COPYING. If not, see
* <http://www.gnu.org/licenses/>.
*
*/
#include "Log.h"
#include "assert.h"
#ifndef UINT16_MAX
#define UINT16_MAX (65535U)
#endif
#include "BitstreamConverter.h"
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
};
////////////////////////////////////////////////////////////////////////////////////////////
/////////////////////////////////////////////////////////////////////////////////////////////
// GStreamer h264 parser
// Copyright (C) 2005 Michal Benes <michal.benes@itonis.tv>
// (C) 2008 Wim Taymans <wim.taymans@gmail.com>
// gsth264parse.c:
// * License as published by the Free Software Foundation; either
// * version 2.1 of the License, or (at your option) any later version.
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 = bs->cache >> shift;
else
res = 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;
}
////////////////////////////////////////////////////////////////////////////////////////////
/////////////////////////////////////////////////////////////////////////////////////////////
CBitstreamParser::CBitstreamParser()
{
}
CBitstreamParser::~CBitstreamParser()
{
Close();
}
bool CBitstreamParser::Open()
{
return true;
}
void CBitstreamParser::Close()
{
}
const uint8_t* CBitstreamParser::find_start_code(const uint8_t *p,
const uint8_t *end, uint32_t *state)
{
assert(p <= end);
if (p >= end)
return end;
for (int i = 0; i < 3; i++) {
uint32_t tmp = *state << 8;
*state = tmp + *(p++);
if (tmp == 0x100 || p == end)
return p;
}
while (p < end) {
if (p[-1] > 1 ) p += 3;
else if (p[-2] ) p += 2;
else if (p[-3]|(p[-1]-1)) p++;
else {
p++;
break;
}
}
p = FFMIN(p, end) - 4;
*state = BS_RB32(p);
return p + 4;
}
bool CBitstreamParser::FindIdrSlice(const uint8_t *buf, int buf_size)
{
if (!buf)
return false;
bool rtn = false;
uint32_t state = -1;
const uint8_t *buf_end = buf + buf_size;
for(;;)
{
buf = find_start_code(buf, buf_end, &state);
if (buf >= buf_end)
{
//CLog::Log(LOGDEBUG, "FindIdrSlice: buf(%p), buf_end(%p)", buf, buf_end);
break;
}
--buf;
int src_length = buf_end - buf;
switch (state & 0x1f)
{
default:
CLog::Log(LOGDEBUG, "FindIdrSlice: found nal_type(%d)", state & 0x1f);
break;
case AVC_NAL_SLICE:
CLog::Log(LOGDEBUG, "FindIdrSlice: found NAL_SLICE");
break;
case AVC_NAL_IDR_SLICE:
CLog::Log(LOGDEBUG, "FindIdrSlice: found NAL_IDR_SLICE");
rtn = true;
break;
case AVC_NAL_SEI:
CLog::Log(LOGDEBUG, "FindIdrSlice: found NAL_SEI");
break;
case AVC_NAL_SPS:
CLog::Log(LOGDEBUG, "FindIdrSlice: found NAL_SPS");
break;
case AVC_NAL_PPS:
CLog::Log(LOGDEBUG, "FindIdrSlice: found NAL_PPS");
break;
}
buf += src_length;
}
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;
}
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(LOGNOTICE, "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)
{
/** @todo from Amlogic
* 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(LOGNOTICE, "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;
}
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 - FF_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 + FF_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, FF_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 - FF_INPUT_BUFFER_PADDING_SIZE ||
(extradata + unit_size) > ((uint8_t*)in_extradata + in_extrasize))
{
av_free(out);
return false;
}
tmp = av_realloc(out, total_size + FF_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, FF_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;
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;
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;
break;
case AV_CODEC_ID_HEVC:
nal_sps = HEVC_NAL_SPS;
nal_pps = HEVC_NAL_PPS;
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;
// 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;
}
}
const 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;
}
const 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);