aac5773f
 hucm
功能基本完成，接口待打磨
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/*
* AV1 common parsing code
*
* 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 "config.h"
#include "libavutil/mem.h"
#include "av1.h"
#include "av1_parse.h"
#include "bytestream.h"
int ff_av1_extract_obu(AV1OBU *obu, const uint8_t *buf, int length, void *logctx)
{
int64_t obu_size;
int start_pos, type, temporal_id, spatial_id;
int len;
len = parse_obu_header(buf, length, &obu_size, &start_pos,
&type, &temporal_id, &spatial_id);
if (len < 0)
return len;
obu->type = type;
obu->temporal_id = temporal_id;
obu->spatial_id = spatial_id;
obu->data = buf + start_pos;
obu->size = obu_size;
obu->raw_data = buf;
obu->raw_size = len;
av_log(logctx, AV_LOG_DEBUG,
"obu_type: %d, temporal_id: %d, spatial_id: %d, payload size: %d\n",
obu->type, obu->temporal_id, obu->spatial_id, obu->size);
return len;
}
int ff_av1_packet_split(AV1Packet *pkt, const uint8_t *buf, int length, void *logctx)
{
GetByteContext bc;
int ret, consumed;
bytestream2_init(&bc, buf, length);
pkt->nb_obus = 0;
while (bytestream2_get_bytes_left(&bc) > 0) {
AV1OBU *obu;
if (pkt->obus_allocated < pkt->nb_obus + 1) {
int new_size = pkt->obus_allocated + 1;
AV1OBU *tmp = av_realloc_array(pkt->obus, new_size, sizeof(*tmp));
if (!tmp)
return AVERROR(ENOMEM);
pkt->obus = tmp;
memset(pkt->obus + pkt->obus_allocated, 0,
(new_size - pkt->obus_allocated) * sizeof(*tmp));
pkt->obus_allocated = new_size;
}
obu = &pkt->obus[pkt->nb_obus];
consumed = ff_av1_extract_obu(obu, bc.buffer, bytestream2_get_bytes_left(&bc), logctx);
if (consumed < 0)
return consumed;
bytestream2_skip(&bc, consumed);
obu->size_bits = get_obu_bit_length(obu->data, obu->size, obu->type);
if (obu->size_bits < 0 || (!obu->size_bits && obu->type != AV1_OBU_TEMPORAL_DELIMITER)) {
av_log(logctx, AV_LOG_ERROR, "Invalid OBU of type %d, skipping.\n", obu->type);
continue;
}
pkt->nb_obus++;
ret = init_get_bits(&obu->gb, obu->data, obu->size_bits);
if (ret < 0)
return ret;
}
return 0;
}
void ff_av1_packet_uninit(AV1Packet *pkt)
{
av_freep(&pkt->obus);
pkt->obus_allocated = 0;
}
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