/* * DSD Stream File (DSF) demuxer * Copyright (c) 2014 Peter Ross * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include "libavutil/intreadwrite.h"#include "avformat.h"#include "internal.h"#include "id3v2.h" typedef struct {    uint64_t data_end;} DSFContext; static int dsf_probe(AVProbeData *p){    if (p->buf_size < 12 || memcmp(p->buf, "DSD ", 4) || AV_RL64(p->buf + 4) != 28)        return 0;    return AVPROBE_SCORE_MAX;} static const uint64_t dsf_channel_layout[] = {    0,    AV_CH_LAYOUT_MONO,    AV_CH_LAYOUT_STEREO,    AV_CH_LAYOUT_SURROUND,    AV_CH_LAYOUT_QUAD,    AV_CH_LAYOUT_4POINT0,    AV_CH_LAYOUT_5POINT0_BACK,    AV_CH_LAYOUT_5POINT1_BACK,}; static void read_id3(AVFormatContext *s, uint64_t id3pos){    ID3v2ExtraMeta *id3v2_extra_meta = NULL;    if (avio_seek(s->pb, id3pos, SEEK_SET) < 0)        return;     ff_id3v2_read(s, ID3v2_DEFAULT_MAGIC, &id3v2_extra_meta, 0);    if (id3v2_extra_meta)        ff_id3v2_parse_apic(s, &id3v2_extra_meta);    ff_id3v2_free_extra_meta(&id3v2_extra_meta);} static int dsf_read_header(AVFormatContext *s){    DSFContext *dsf = s->priv_data;    AVIOContext *pb = s->pb;    AVStream *st;    uint64_t id3pos;    unsigned int channel_type;     avio_skip(pb, 4);    if (avio_rl64(pb) != 28)        return AVERROR_INVALIDDATA;     /* create primary stream before any id3 coverart streams */    st = avformat_new_stream(s, NULL);    if (!st)        return AVERROR(ENOMEM);     avio_skip(pb, 8);    id3pos = avio_rl64(pb);    if (pb->seekable & AVIO_SEEKABLE_NORMAL) {        read_id3(s, id3pos);        avio_seek(pb, 28, SEEK_SET);    }     /* fmt chunk */     if (avio_rl32(pb) != MKTAG('f', 'm', 't', ' ') || avio_rl64(pb) != 52)        return AVERROR_INVALIDDATA;     if (avio_rl32(pb) != 1) {        avpriv_request_sample(s, "unknown format version");        return AVERROR_INVALIDDATA;    }     if (avio_rl32(pb)) {        avpriv_request_sample(s, "unknown format id");        return AVERROR_INVALIDDATA;    }     channel_type = avio_rl32(pb);    if (channel_type < FF_ARRAY_ELEMS(dsf_channel_layout))        st->codecpar->channel_layout = dsf_channel_layout[channel_type];    if (!st->codecpar->channel_layout)        avpriv_request_sample(s, "channel type %i", channel_type);     st->codecpar->codec_type   = AVMEDIA_TYPE_AUDIO;    st->codecpar->channels     = avio_rl32(pb);    st->codecpar->sample_rate  = avio_rl32(pb) / 8;     if (st->codecpar->channels <= 0)        return AVERROR_INVALIDDATA;     switch(avio_rl32(pb)) {    case 1: st->codecpar->codec_id = AV_CODEC_ID_DSD_LSBF_PLANAR; break;    case 8: st->codecpar->codec_id = AV_CODEC_ID_DSD_MSBF_PLANAR; break;    default:        avpriv_request_sample(s, "unknown most significant bit");        return AVERROR_INVALIDDATA;    }     avio_skip(pb, 8);    st->codecpar->block_align = avio_rl32(pb);    if (st->codecpar->block_align > INT_MAX / st->codecpar->channels) {        avpriv_request_sample(s, "block_align overflow");        return AVERROR_INVALIDDATA;    }    st->codecpar->block_align *= st->codecpar->channels;    st->codecpar->bit_rate = st->codecpar->channels * st->codecpar->sample_rate * 8LL;    avio_skip(pb, 4);     /* data chunk */     dsf->data_end = avio_tell(pb);    if (avio_rl32(pb) != MKTAG('d', 'a', 't', 'a'))        return AVERROR_INVALIDDATA;    dsf->data_end += avio_rl64(pb);     return 0;} static int dsf_read_packet(AVFormatContext *s, AVPacket *pkt){    DSFContext *dsf = s->priv_data;    AVIOContext *pb = s->pb;    AVStream *st = s->streams[0];    int64_t pos = avio_tell(pb);     if (pos >= dsf->data_end)        return AVERROR_EOF;     pkt->stream_index = 0;    return av_get_packet(pb, pkt, FFMIN(dsf->data_end - pos, st->codecpar->block_align));} AVInputFormat ff_dsf_demuxer = {    .name           = "dsf",    .long_name      = NULL_IF_CONFIG_SMALL("DSD Stream File (DSF)"),    .priv_data_size = sizeof(DSFContext),    .read_probe     = dsf_probe,    .read_header    = dsf_read_header,    .read_packet    = dsf_read_packet,    .flags          = AVFMT_GENERIC_INDEX | AVFMT_NO_BYTE_SEEK,};