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/*
* Copyright (C) 2010-2013 Hendrik Leppkes
* http://www.1f0.de
*
* 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 of the License, 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 this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "stdafx.h"
#include "AVC1AnnexBConverter.h"
#include "libavutil/intreadwrite.h"
CAVC1AnnexBConverter::CAVC1AnnexBConverter(void)
{
}
CAVC1AnnexBConverter::~CAVC1AnnexBConverter(void)
{
}
static HRESULT alloc_and_copy(uint8_t **poutbuf, int *poutbuf_size, const uint8_t *in, uint32_t in_size) {
uint32_t offset = *poutbuf_size;
uint8_t nal_header_size = offset ? 3 : 4;
void *tmp;
*poutbuf_size += in_size+nal_header_size;
tmp = av_realloc(*poutbuf, *poutbuf_size);
if (!tmp)
return E_OUTOFMEMORY;
*poutbuf = (uint8_t *)tmp;
memcpy(*poutbuf+nal_header_size+offset, in, in_size);
if (!offset) {
AV_WB32(*poutbuf, 1);
} else {
(*poutbuf+offset)[0] = (*poutbuf+offset)[1] = 0;
(*poutbuf+offset)[2] = 1;
}
return S_OK;
}
HRESULT CAVC1AnnexBConverter::Convert(BYTE **poutbuf, int *poutbuf_size, const BYTE *buf, int buf_size)
{
int32_t nal_size;
const uint8_t *buf_end = buf + buf_size;
*poutbuf_size = 0;
do {
if (buf + m_NaluSize > buf_end)
goto fail;
if (m_NaluSize == 1) {
nal_size = buf[0];
} else if (m_NaluSize == 2) {
nal_size = AV_RB16(buf);
} else {
nal_size = AV_RB32(buf);
if (m_NaluSize == 3)
nal_size >>= 8;
}
buf += m_NaluSize;
if (buf + nal_size > buf_end || nal_size < 0)
goto fail;
if (FAILED(alloc_and_copy(poutbuf, poutbuf_size, buf, nal_size)))
goto fail;
buf += nal_size;
buf_size -= (nal_size + m_NaluSize);
} while (buf_size > 0);
return S_OK;
fail:
av_freep(poutbuf);
return E_FAIL;
}
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