/* * 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/channel_layout.h"#include "libavutil/intreadwrite.h"#include "avformat.h"#include "demux.h"#include "internal.h"#include "id3v2.h" typedef struct {    uint64_t data_end;    uint64_t audio_size;    uint64_t data_size;} DSFContext; static int dsf_probe(const 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 AVChannelLayout dsf_channel_layout[] = {    { .order = AV_CHANNEL_ORDER_UNSPEC },    AV_CHANNEL_LAYOUT_MONO,    AV_CHANNEL_LAYOUT_STEREO,    AV_CHANNEL_LAYOUT_SURROUND,    AV_CHANNEL_LAYOUT_QUAD,    AV_CHANNEL_LAYOUT_4POINT0,    AV_CHANNEL_LAYOUT_5POINT0_BACK,    AV_CHANNEL_LAYOUT_5POINT1_BACK,}; static void read_id3(AVFormatContext *s, uint64_t id3pos){    ID3v2ExtraMeta *id3v2_extra_meta;    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_parse_chapters(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;    int channels;     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->ch_layout = dsf_channel_layout[channel_type];    if (!st->codecpar->ch_layout.nb_channels)        avpriv_request_sample(s, "channel type %i", channel_type);     st->codecpar->codec_type   = AVMEDIA_TYPE_AUDIO;    channels = avio_rl32(pb);    if (!st->codecpar->ch_layout.nb_channels) {        st->codecpar->ch_layout.nb_channels = channels;    } else if (channels != st->codecpar->ch_layout.nb_channels) {        av_log(s, AV_LOG_ERROR, "Channel count mismatch\n");        return AVERROR(EINVAL);    }    st->codecpar->sample_rate  = avio_rl32(pb) / 8;     if (st->codecpar->ch_layout.nb_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;    }     dsf->audio_size = avio_rl64(pb) / 8 * st->codecpar->ch_layout.nb_channels;    st->codecpar->block_align = avio_rl32(pb);    if (st->codecpar->block_align > INT_MAX / st->codecpar->ch_layout.nb_channels ||        st->codecpar->block_align <= 0) {        avpriv_request_sample(s, "block_align invalid");        return AVERROR_INVALIDDATA;    }    st->codecpar->block_align *= st->codecpar->ch_layout.nb_channels;    st->codecpar->bit_rate = st->codecpar->ch_layout.nb_channels * 8LL * st->codecpar->sample_rate;    avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);    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_size = avio_rl64(pb) - 12;    dsf->data_end += dsf->data_size + 12;     return 0;} static int dsf_read_packet(AVFormatContext *s, AVPacket *pkt){    FFFormatContext *const si = ffformatcontext(s);    DSFContext *dsf = s->priv_data;    AVIOContext *pb = s->pb;    AVStream *st = s->streams[0];    int64_t pos = avio_tell(pb);    int channels = st->codecpar->ch_layout.nb_channels;    int ret;     if (pos >= dsf->data_end)        return AVERROR_EOF;     if (dsf->data_size > dsf->audio_size) {        int last_packet = pos == (dsf->data_end - st->codecpar->block_align);         if (last_packet) {            int64_t data_pos = pos - si->data_offset;            int64_t packet_size = dsf->audio_size - data_pos;            int64_t skip_size = dsf->data_size - data_pos - packet_size;            uint8_t *dst;            int ch, ret;             if (packet_size <= 0 || skip_size <= 0)                return AVERROR_INVALIDDATA;             if ((ret = av_new_packet(pkt, packet_size)) < 0)                return ret;            dst = pkt->data;            for (ch = 0; ch < st->codecpar->ch_layout.nb_channels; ch++) {                ret = avio_read(pb, dst,  packet_size / st->codecpar->ch_layout.nb_channels);                if (ret < packet_size / st->codecpar->ch_layout.nb_channels)                    return AVERROR_EOF;                 dst += ret;                avio_skip(pb, skip_size / st->codecpar->ch_layout.nb_channels);            }             pkt->pos = pos;            pkt->stream_index = 0;            pkt->pts = (pos - si->data_offset) / channels;            pkt->duration = packet_size / channels;            return 0;        }    }    ret = av_get_packet(pb, pkt, FFMIN(dsf->data_end - pos, st->codecpar->block_align));    if (ret < 0)        return ret;     pkt->stream_index = 0;    pkt->pts = (pos - si->data_offset) / channels;    pkt->duration = st->codecpar->block_align / channels;     return 0;} const FFInputFormat ff_dsf_demuxer = {    .p.name         = "dsf",    .p.long_name    = NULL_IF_CONFIG_SMALL("DSD Stream File (DSF)"),    .p.flags        = AVFMT_GENERIC_INDEX | AVFMT_NO_BYTE_SEEK,    .priv_data_size = sizeof(DSFContext),    .read_probe     = dsf_probe,    .read_header    = dsf_read_header,    .read_packet    = dsf_read_packet,};