147 lines
4.3 KiB
C
147 lines
4.3 KiB
C
/*
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* WavArc demuxer
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* Copyright (c) 2023 Paul B Mahol
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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 "avio_internal.h"
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#include "demux.h"
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#include "internal.h"
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typedef struct WavArcContext {
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int64_t data_end;
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} WavArcContext;
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static int wavarc_probe(const AVProbeData *p)
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{
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int len = p->buf[0];
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uint32_t id;
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if (len == 0 || len + 6 >= p->buf_size)
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return 0;
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if (p->buf[len + 1] != 0)
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return 0;
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id = AV_RL32(p->buf + len + 2);
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if (id != MKTAG('0','C','P','Y') &&
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id != MKTAG('1','D','I','F') &&
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id != MKTAG('2','S','L','P') &&
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id != MKTAG('3','N','L','P') &&
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id != MKTAG('4','A','L','P') &&
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id != MKTAG('5','E','L','P'))
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return 0;
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return AVPROBE_SCORE_MAX / 3 * 2;
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}
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static int wavarc_read_header(AVFormatContext *s)
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{
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WavArcContext *w = s->priv_data;
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AVIOContext *pb = s->pb;
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AVCodecParameters *par;
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int filename_len, fmt_len, ret;
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uint8_t data[36];
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AVStream *st;
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uint32_t id;
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filename_len = avio_r8(pb);
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if (filename_len == 0)
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return AVERROR_INVALIDDATA;
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avio_skip(pb, filename_len);
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if (avio_r8(pb))
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return AVERROR_INVALIDDATA;
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id = avio_rl32(pb);
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w->data_end = avio_tell(pb);
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if (avio_read(pb, data, sizeof(data)) != sizeof(data))
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return AVERROR(EIO);
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w->data_end += 16LL + AV_RL32(data + 4);
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fmt_len = AV_RL32(data + 32);
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if (fmt_len < 12)
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return AVERROR_INVALIDDATA;
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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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par = st->codecpar;
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ret = ff_alloc_extradata(par, fmt_len + sizeof(data));
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if (ret < 0)
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return ret;
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memcpy(par->extradata, data, sizeof(data));
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ret = ffio_read_size(pb, par->extradata + sizeof(data), fmt_len);
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if (ret < 0)
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return ret;
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par->codec_type = AVMEDIA_TYPE_AUDIO;
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par->codec_id = AV_CODEC_ID_WAVARC;
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par->codec_tag = id;
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do {
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id = avio_rl32(pb);
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if (id != MKTAG('d','a','t','a'))
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avio_skip(pb, avio_rl32(pb));
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} while (id != MKTAG('d','a','t','a') && !avio_feof(pb));
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avio_skip(pb, 4);
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if (AV_RL32(par->extradata + 16) != MKTAG('R','I','F','F'))
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return AVERROR_INVALIDDATA;
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if (AV_RL32(par->extradata + 24) != MKTAG('W','A','V','E'))
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return AVERROR_INVALIDDATA;
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if (AV_RL32(par->extradata + 28) != MKTAG('f','m','t',' '))
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return AVERROR_INVALIDDATA;
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av_channel_layout_default(&par->ch_layout, AV_RL16(par->extradata + 38));
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par->sample_rate = AV_RL32(par->extradata + 40);
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avpriv_set_pts_info(st, 64, 1, par->sample_rate);
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st->start_time = 0;
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return 0;
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}
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static int wavarc_read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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WavArcContext *w = s->priv_data;
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AVIOContext *pb = s->pb;
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int64_t size, left = w->data_end - avio_tell(pb);
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int ret;
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size = FFMIN(left, 1024);
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if (size <= 0)
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return AVERROR_EOF;
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ret = av_get_packet(pb, pkt, size);
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pkt->stream_index = 0;
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return ret;
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}
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const AVInputFormat ff_wavarc_demuxer = {
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.name = "wavarc",
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.long_name = NULL_IF_CONFIG_SMALL("Waveform Archiver"),
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.priv_data_size = sizeof(WavArcContext),
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.read_probe = wavarc_probe,
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.read_packet = wavarc_read_packet,
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.flags = AVFMT_NOBINSEARCH | AVFMT_NOGENSEARCH | AVFMT_NO_BYTE_SEEK | AVFMT_NOTIMESTAMPS,
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.read_header = wavarc_read_header,
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.extensions = "wa",
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.raw_codec_id = AV_CODEC_ID_WAVARC,
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};
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