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https://github.com/FFmpeg/FFmpeg.git
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123 lines
3.6 KiB
C
123 lines
3.6 KiB
C
/*
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* AV1 common parsing code
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "config.h"
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#include "libavutil/mem.h"
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#include "av1.h"
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#include "av1_parse.h"
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#include "bytestream.h"
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int ff_av1_extract_obu(AV1OBU *obu, const uint8_t *buf, int length, void *logctx)
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{
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int64_t obu_size;
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int start_pos, type, temporal_id, spatial_id;
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int len;
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len = parse_obu_header(buf, length, &obu_size, &start_pos,
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&type, &temporal_id, &spatial_id);
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if (len < 0)
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return len;
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obu->type = type;
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obu->temporal_id = temporal_id;
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obu->spatial_id = spatial_id;
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obu->data = buf + start_pos;
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obu->size = obu_size;
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obu->raw_data = buf;
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obu->raw_size = len;
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av_log(logctx, AV_LOG_DEBUG,
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"obu_type: %d, temporal_id: %d, spatial_id: %d, payload size: %d\n",
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obu->type, obu->temporal_id, obu->spatial_id, obu->size);
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return len;
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}
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int ff_av1_packet_split(AV1Packet *pkt, const uint8_t *buf, int length, void *logctx)
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{
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GetByteContext bc;
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int consumed;
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bytestream2_init(&bc, buf, length);
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pkt->nb_obus = 0;
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while (bytestream2_get_bytes_left(&bc) > 0) {
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AV1OBU *obu;
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if (pkt->obus_allocated < pkt->nb_obus + 1) {
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int new_size = pkt->obus_allocated + 1;
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AV1OBU *tmp;
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if (new_size >= INT_MAX / sizeof(*tmp))
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return AVERROR(ENOMEM);
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tmp = av_fast_realloc(pkt->obus, &pkt->obus_allocated_size, new_size * sizeof(*tmp));
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if (!tmp)
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return AVERROR(ENOMEM);
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pkt->obus = tmp;
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memset(pkt->obus + pkt->obus_allocated, 0, sizeof(*pkt->obus));
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pkt->obus_allocated = new_size;
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}
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obu = &pkt->obus[pkt->nb_obus];
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consumed = ff_av1_extract_obu(obu, bc.buffer, bytestream2_get_bytes_left(&bc), logctx);
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if (consumed < 0)
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return consumed;
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bytestream2_skip(&bc, consumed);
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obu->size_bits = get_obu_bit_length(obu->data, obu->size, obu->type);
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if (obu->size_bits < 0 ||
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(obu->size_bits == 0 && (obu->type != AV1_OBU_TEMPORAL_DELIMITER &&
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obu->type != AV1_OBU_PADDING))) {
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av_log(logctx, AV_LOG_ERROR, "Invalid OBU of type %d, skipping.\n", obu->type);
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continue;
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}
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pkt->nb_obus++;
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}
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return 0;
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}
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void ff_av1_packet_uninit(AV1Packet *pkt)
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{
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av_freep(&pkt->obus);
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pkt->obus_allocated = pkt->obus_allocated_size = 0;
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}
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AVRational ff_av1_framerate(int64_t ticks_per_frame, int64_t units_per_tick,
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int64_t time_scale)
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{
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AVRational fr;
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if (ticks_per_frame && units_per_tick && time_scale &&
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ticks_per_frame < INT64_MAX / units_per_tick &&
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av_reduce(&fr.den, &fr.num, units_per_tick * ticks_per_frame,
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time_scale, INT_MAX))
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return fr;
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return (AVRational){ 0, 1 };
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}
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