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114 lines
3.1 KiB
114 lines
3.1 KiB
/* |
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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 "demux.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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int ret; |
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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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ret = ffio_ensure_seekback(pb, 4); |
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if (ret < 0) |
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return ret; |
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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 FFInputFormat ff_qoa_demuxer = { |
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.p.name = "qoa", |
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.p.long_name = NULL_IF_CONFIG_SMALL("QOA"), |
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.p.flags = AVFMT_GENERIC_INDEX, |
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.p.extensions = "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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};
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