/* * 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 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;             if (new_size >= INT_MAX / sizeof(*tmp))                return AVERROR(ENOMEM);            tmp = av_fast_realloc(pkt->obus, &pkt->obus_allocated_size, new_size * sizeof(*tmp));            if (!tmp)                return AVERROR(ENOMEM);             pkt->obus = tmp;            memset(pkt->obus + pkt->obus_allocated, 0, sizeof(*pkt->obus));            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 == 0 && (obu->type != AV1_OBU_TEMPORAL_DELIMITER &&                                     obu->type != AV1_OBU_PADDING))) {            av_log(logctx, AV_LOG_ERROR, "Invalid OBU of type %d, skipping.\n", obu->type);            continue;        }         pkt->nb_obus++;    }     return 0;} void ff_av1_packet_uninit(AV1Packet *pkt){    av_freep(&pkt->obus);    pkt->obus_allocated = pkt->obus_allocated_size = 0;} AVRational ff_av1_framerate(int64_t ticks_per_frame, int64_t units_per_tick,                            int64_t time_scale){    AVRational fr;     if (ticks_per_frame && units_per_tick && time_scale &&        ticks_per_frame < INT64_MAX / units_per_tick    &&        av_reduce(&fr.den, &fr.num, units_per_tick * ticks_per_frame,                  time_scale, INT_MAX))        return fr;     return (AVRational){ 0, 1 };}