mirror of https://git.ffmpeg.org/ffmpeg.git
146 lines
3.7 KiB
C
146 lines
3.7 KiB
C
/*
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* AV1 helper functions for muxers
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* Copyright (c) 2018 James Almer <jamrial@gmail.com>
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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 "libavutil/mem.h"
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#include "libavcodec/av1.h"
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#include "libavcodec/av1_parse.h"
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#include "av1.h"
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#include "avio.h"
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int ff_av1_filter_obus(AVIOContext *pb, const uint8_t *buf, int size)
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{
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const uint8_t *end = buf + size;
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int64_t obu_size;
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int start_pos, type, temporal_id, spatial_id;
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size = 0;
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while (buf < end) {
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int len = parse_obu_header(buf, end - buf, &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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switch (type) {
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case AV1_OBU_TEMPORAL_DELIMITER:
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case AV1_OBU_REDUNDANT_FRAME_HEADER:
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case AV1_OBU_PADDING:
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break;
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default:
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avio_write(pb, buf, len);
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size += len;
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break;
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}
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buf += len;
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}
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return size;
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}
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int ff_av1_filter_obus_buf(const uint8_t *buf, uint8_t **out, int *size)
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{
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AVIOContext *pb;
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int ret;
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ret = avio_open_dyn_buf(&pb);
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if (ret < 0)
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return ret;
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ret = ff_av1_filter_obus(pb, buf, *size);
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if (ret < 0)
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return ret;
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av_freep(out);
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*size = avio_close_dyn_buf(pb, out);
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return ret;
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}
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int ff_isom_write_av1c(AVIOContext *pb, const uint8_t *buf, int size)
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{
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AVIOContext *seq_pb = NULL, *meta_pb = NULL;
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uint8_t *seq = NULL, *meta = NULL;
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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 ret, nb_seq = 0, seq_size, meta_size;
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if (size <= 0)
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return AVERROR_INVALIDDATA;
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ret = avio_open_dyn_buf(&seq_pb);
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if (ret < 0)
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return ret;
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ret = avio_open_dyn_buf(&meta_pb);
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if (ret < 0)
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goto fail;
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while (size > 0) {
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int len = parse_obu_header(buf, size, &obu_size, &start_pos,
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&type, &temporal_id, &spatial_id);
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if (len < 0) {
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ret = len;
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goto fail;
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}
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switch (type) {
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case AV1_OBU_SEQUENCE_HEADER:
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nb_seq++;
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if (!obu_size || nb_seq > 1) {
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ret = AVERROR_INVALIDDATA;
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goto fail;
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}
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avio_write(seq_pb, buf, len);
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break;
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case AV1_OBU_METADATA:
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if (!obu_size) {
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ret = AVERROR_INVALIDDATA;
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goto fail;
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}
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avio_write(meta_pb, buf, len);
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break;
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default:
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break;
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}
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size -= len;
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buf += len;
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}
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seq_size = avio_close_dyn_buf(seq_pb, &seq);
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if (!seq_size) {
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ret = AVERROR_INVALIDDATA;
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goto fail;
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}
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avio_write(pb, seq, seq_size);
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meta_size = avio_close_dyn_buf(meta_pb, &meta);
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if (meta_size)
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avio_write(pb, meta, meta_size);
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fail:
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if (!seq)
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avio_close_dyn_buf(seq_pb, &seq);
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if (!meta)
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avio_close_dyn_buf(meta_pb, &meta);
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av_free(seq);
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av_free(meta);
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return ret;
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}
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