mirror of
https://gitee.com/openharmony/third_party_ffmpeg
synced 2024-11-24 03:39:45 +00:00
99 lines
2.6 KiB
C
99 lines
2.6 KiB
C
/*
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* ADP demuxer
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* Copyright (c) 2013 James Almer
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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/channel_layout.h"
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#include "libavutil/intreadwrite.h"
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#include "avformat.h"
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#include "internal.h"
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static int adp_probe(AVProbeData *p)
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{
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int i, changes = 0;
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uint8_t last = 0;
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if (p->buf_size < 32)
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return 0;
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for (i = 0; i < p->buf_size - 3; i+=32) {
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if (p->buf[i] != p->buf[i+2] || p->buf[i+1] != p->buf[i+3])
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return 0;
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if (p->buf[i] != last)
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changes++;
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last = p->buf[i];
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}
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if (changes <= 1)
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return 0;
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return p->buf_size < 260 ? 1 : AVPROBE_SCORE_MAX / 4;
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}
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static int adp_read_header(AVFormatContext *s)
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{
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AVStream *st;
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st = avformat_new_stream(s, NULL);
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if (!st)
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return AVERROR(ENOMEM);
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st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
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st->codecpar->codec_id = AV_CODEC_ID_ADPCM_DTK;
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st->codecpar->channel_layout = AV_CH_LAYOUT_STEREO;
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st->codecpar->channels = 2;
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st->codecpar->sample_rate = 48000;
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st->start_time = 0;
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if (s->pb->seekable & AVIO_SEEKABLE_NORMAL)
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st->duration = av_get_audio_frame_duration2(st->codecpar, avio_size(s->pb));
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avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
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return 0;
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}
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static int adp_read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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int ret, size = 1024;
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if (avio_feof(s->pb))
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return AVERROR_EOF;
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ret = av_get_packet(s->pb, pkt, size);
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if (ret != size) {
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if (ret < 0) {
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av_packet_unref(pkt);
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return ret;
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}
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av_shrink_packet(pkt, ret);
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}
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pkt->stream_index = 0;
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return ret;
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}
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AVInputFormat ff_adp_demuxer = {
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.name = "adp",
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.long_name = NULL_IF_CONFIG_SMALL("ADP"),
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.read_probe = adp_probe,
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.read_header = adp_read_header,
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.read_packet = adp_read_packet,
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.extensions = "adp,dtk",
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};
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