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/*
* 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 "bytestream.h"
#include "h2645_parse.h"
#include "hevc.h"
#include "hevc_parse.h"
static int hevc_decode_nal_units(const uint8_t *buf, int buf_size, HEVCParamSets *ps,
int is_nalff, int nal_length_size, void *logctx)
{
int i;
int ret = 0;
H2645Packet pkt = { 0 };
ret = ff_h2645_packet_split(&pkt, buf, buf_size, logctx, is_nalff, nal_length_size, AV_CODEC_ID_HEVC, 1);
if (ret < 0) {
goto done;
}
for (i = 0; i < pkt.nb_nals; i++) {
H2645NAL *nal = &pkt.nals[i];
/* ignore everything except parameter sets and VCL NALUs */
switch (nal->type) {
case HEVC_NAL_VPS: ff_hevc_decode_nal_vps(&nal->gb, logctx, ps); break;
case HEVC_NAL_SPS: ff_hevc_decode_nal_sps(&nal->gb, logctx, ps, 1); break;
case HEVC_NAL_PPS: ff_hevc_decode_nal_pps(&nal->gb, logctx, ps); break;
default:
av_log(logctx, AV_LOG_VERBOSE, "Ignoring NAL type %d in extradata\n", nal->type);
break;
}
}
done:
ff_h2645_packet_uninit(&pkt);
return ret;
}
int ff_hevc_decode_extradata(const uint8_t *data, int size, HEVCParamSets *ps,
int *is_nalff, int *nal_length_size,
int err_recognition, void *logctx)
{
int ret = 0;
GetByteContext gb;
bytestream2_init(&gb, data, size);
if (size > 3 && (data[0] || data[1] || data[2] > 1)) {
/* 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 avctx->extradata[0]==1 or not. */
int i, j, num_arrays, nal_len_size;
*is_nalff = 1;
bytestream2_skip(&gb, 21);
nal_len_size = (bytestream2_get_byte(&gb) & 3) + 1;
num_arrays = bytestream2_get_byte(&gb);
/* nal units in the hvcC always have length coded with 2 bytes,
* so put a fake nal_length_size = 2 while parsing them */
*nal_length_size = 2;
/* Decode nal units from hvcC. */
for (i = 0; i < num_arrays; i++) {
int type = bytestream2_get_byte(&gb) & 0x3f;
int cnt = bytestream2_get_be16(&gb);
for (j = 0; j < cnt; j++) {
// +2 for the nal size field
int nalsize = bytestream2_peek_be16(&gb) + 2;
if (bytestream2_get_bytes_left(&gb) < nalsize) {
av_log(logctx, AV_LOG_ERROR,
"Invalid NAL unit size in extradata.\n");
return AVERROR_INVALIDDATA;
}
ret = hevc_decode_nal_units(gb.buffer, nalsize, ps, *is_nalff, *nal_length_size, logctx);
if (ret < 0) {
av_log(logctx, AV_LOG_ERROR,
"Decoding nal unit %d %d from hvcC failed\n",
type, i);
return ret;
}
bytestream2_skip(&gb, nalsize);
}
}
/* Now store right nal length size, that will be used to parse
* all other nals */
*nal_length_size = nal_len_size;
} else {
*is_nalff = 0;
ret = hevc_decode_nal_units(data, size, ps, *is_nalff, *nal_length_size, logctx);
if (ret < 0)
return ret;
}
return ret;
}
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