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/*
* AV1 helper functions for muxers
* Copyright (c) 2018 James Almer <jamrial@gmail.com>
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "libavutil/mem.h"
#include "libavcodec/av1.h"
#include "libavcodec/av1_parse.h"
#include "av1.h"
#include "avio.h"
int ff_av1_filter_obus(AVIOContext *pb, const uint8_t *buf, int size)
{
const uint8_t *end = buf + size;
int64_t obu_size;
int start_pos, type, temporal_id, spatial_id;
size = 0;
while (buf < end) {
int ret = parse_obu_header(buf, end - buf, &obu_size, &start_pos,
&type, &temporal_id, &spatial_id);
if (ret < 0)
return ret;
obu_size += start_pos;
if (obu_size > INT_MAX)
return AVERROR_INVALIDDATA;
switch (type) {
case AV1_OBU_TEMPORAL_DELIMITER:
case AV1_OBU_REDUNDANT_FRAME_HEADER:
case AV1_OBU_PADDING:
break;
default:
avio_write(pb, buf, obu_size);
size += obu_size;
break;
}
buf += obu_size;
}
return size;
}
int ff_av1_filter_obus_buf(const uint8_t *buf, uint8_t **out, int *size)
{
AVIOContext *pb;
int ret;
ret = avio_open_dyn_buf(&pb);
if (ret < 0)
return ret;
ret = ff_av1_filter_obus(pb, buf, *size);
if (ret < 0)
return ret;
av_freep(out);
*size = avio_close_dyn_buf(pb, out);
return ret;
}
int ff_isom_write_av1c(AVIOContext *pb, const uint8_t *buf, int size)
{
int64_t obu_size;
int start_pos, type, temporal_id, spatial_id;
while (size > 0) {
int ret = parse_obu_header(buf, size, &obu_size, &start_pos,
&type, &temporal_id, &spatial_id);
if (ret < 0)
return ret;
obu_size += start_pos;
if (obu_size > INT_MAX)
return AVERROR_INVALIDDATA;
switch (type) {
case AV1_OBU_SEQUENCE_HEADER:
case AV1_OBU_METADATA:
avio_write(pb, buf, obu_size);
break;
default:
break;
}
size -= obu_size;
buf += obu_size;
}
return 0;
}
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