mirror of
https://git.ffmpeg.org/ffmpeg.git
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111 lines
3.0 KiB
C
111 lines
3.0 KiB
C
/*
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* QOA demuxer
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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 "avformat.h"
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#include "avio_internal.h"
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#include "internal.h"
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#include "libavutil/intreadwrite.h"
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static int qoa_probe(const AVProbeData *p)
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{
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if ((p->buf_size < 16) ||
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(AV_RB32(p->buf) != MKBETAG('q','o','a','f')) ||
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(AV_RB32(p->buf + 4) == 0) ||
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(p->buf[8] == 0) ||
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(AV_RB24(p->buf + 9) == 0) ||
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(AV_RB16(p->buf + 12) == 0) ||
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(AV_RB16(p->buf + 14) == 0))
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return 0;
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return AVPROBE_SCORE_MAX;
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}
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static int qoa_read_header(AVFormatContext *s)
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{
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AVIOContext *pb = s->pb;
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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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avio_skip(pb, 4);
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st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
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st->codecpar->codec_id = AV_CODEC_ID_QOA;
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st->duration = avio_rb32(pb);
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st->start_time = 0;
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ffio_ensure_seekback(pb, 4);
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st->codecpar->ch_layout.nb_channels = avio_r8(pb);
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if (st->codecpar->ch_layout.nb_channels == 0)
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return AVERROR_INVALIDDATA;
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st->codecpar->sample_rate = avio_rb24(pb);
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if (st->codecpar->sample_rate == 0)
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return AVERROR_INVALIDDATA;
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avio_seek(pb, -4, SEEK_CUR);
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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 qoa_read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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AVIOContext *pb = s->pb;
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uint16_t size, duration;
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uint8_t hdr[8];
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int64_t pos;
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int ret;
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if (avio_feof(pb))
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return AVERROR_EOF;
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pos = avio_tell(pb);
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ret = avio_read(pb, hdr, sizeof(hdr));
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if (ret != sizeof(hdr))
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return AVERROR_EOF;
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duration = AV_RB16(hdr + 4);
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size = AV_RB16(hdr + 6);
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if ((ret = av_new_packet(pkt, size)) < 0)
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return ret;
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memcpy(pkt->data, hdr, sizeof(hdr));
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ret = avio_read(pb, pkt->data + sizeof(hdr), size - sizeof(hdr));
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if (ret != size - sizeof(hdr))
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return AVERROR(EIO);
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pkt->stream_index = 0;
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pkt->pos = pos;
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pkt->duration = duration;
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return 0;
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}
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const AVInputFormat ff_qoa_demuxer = {
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.name = "qoa",
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.long_name = NULL_IF_CONFIG_SMALL("QOA"),
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.read_probe = qoa_probe,
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.read_header = qoa_read_header,
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.read_packet = qoa_read_packet,
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.flags = AVFMT_GENERIC_INDEX,
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.extensions = "qoa",
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};
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