/*
  * Raw DTS-HD demuxer
  * Copyright (c) 2012 Paul B Mahol
  *
  * 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 "libavutil/dict.h"

 #include "libavcodec/dca.h"

 #include "avformat.h"

 #include "internal.h"

 
 #define AUPR_HDR 0x415550522D484452
 #define AUPRINFO 0x41555052494E464F
 #define BITSHVTB 0x4249545348565442
 #define BLACKOUT 0x424C41434B4F5554
 #define BRANCHPT 0x4252414E43485054
 #define BUILDVER 0x4255494C44564552
 #define CORESSMD 0x434F524553534D44
 #define DTSHDHDR 0x4454534844484452
 #define EXTSS_MD 0x45585453535f4d44
 #define FILEINFO 0x46494C45494E464F
 #define NAVI_TBL 0x4E4156492D54424C
 #define STRMDATA 0x5354524D44415441
 #define TIMECODE 0x54494D45434F4445
 
 typedef struct DTSHDDemuxContext {

     uint64_t    data_end;

 } DTSHDDemuxContext;
 
 static int dtshd_probe(AVProbeData *p)
 {
     if (AV_RB64(p->buf) == DTSHDHDR)
         return AVPROBE_SCORE_MAX;
     return 0;
 }
 
 static int dtshd_read_header(AVFormatContext *s)
 {
     DTSHDDemuxContext *dtshd = s->priv_data;
     AVIOContext *pb = s->pb;
     uint64_t chunk_type, chunk_size;

     int64_t duration, data_start;

     AVStream *st;
     int ret;
     char *value;
 
     st = avformat_new_stream(s, NULL);
     if (!st)
         return AVERROR(ENOMEM);

     st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
     st->codecpar->codec_id   = AV_CODEC_ID_DTS;
     st->need_parsing         = AVSTREAM_PARSE_FULL_RAW;

     for (;;) {

         chunk_type = avio_rb64(pb);
         chunk_size = avio_rb64(pb);
 

         if (avio_feof(pb))
             break;
 

         if (chunk_size < 4) {
             av_log(s, AV_LOG_ERROR, "chunk size too small\n");
             return AVERROR_INVALIDDATA;
         }
         if (chunk_size > ((uint64_t)1 << 61)) {
             av_log(s, AV_LOG_ERROR, "chunk size too big\n");
             return AVERROR_INVALIDDATA;
         }
 
         switch (chunk_type) {
         case STRMDATA:

             data_start = avio_tell(pb);
             dtshd->data_end = data_start + chunk_size;

             if (dtshd->data_end <= chunk_size)
                 return AVERROR_INVALIDDATA;

             if (!(pb->seekable & AVIO_SEEKABLE_NORMAL))

                 goto break_loop;

             goto skip;

             break;

         case AUPR_HDR:
             if (chunk_size < 21)
                 return AVERROR_INVALIDDATA;
             avio_skip(pb, 3);
             st->codecpar->sample_rate = avio_rb24(pb);
             if (!st->codecpar->sample_rate)
                 return AVERROR_INVALIDDATA;
             duration  = avio_rb32(pb); // num_frames
             duration *= avio_rb16(pb); // samples_per_frames
             st->duration = duration;
             avio_skip(pb, 5);
             st->codecpar->channels = ff_dca_count_chs_for_mask(avio_rb16(pb));
             st->codecpar->initial_padding = avio_rb16(pb);
             avio_skip(pb, chunk_size - 21);
             break;

         case FILEINFO:
             if (chunk_size > INT_MAX)
                 goto skip;
             value = av_malloc(chunk_size);
             if (!value)
                 goto skip;
             avio_read(pb, value, chunk_size);
             value[chunk_size - 1] = 0;
             av_dict_set(&s->metadata, "fileinfo", value,
                         AV_DICT_DONT_STRDUP_VAL);
             break;
         default:
 skip:
             ret = avio_skip(pb, chunk_size);
             if (ret < 0)
                 return ret;
         };
     }
 

     if (!dtshd->data_end)
         return AVERROR_EOF;
 

     avio_seek(pb, data_start, SEEK_SET);

 break_loop:
     if (st->codecpar->sample_rate)
         avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
 

     return 0;

 }
 
 static int raw_read_packet(AVFormatContext *s, AVPacket *pkt)
 {
     DTSHDDemuxContext *dtshd = s->priv_data;

     int64_t size, left;

     int ret;
 

     left = dtshd->data_end - avio_tell(s->pb);
     size = FFMIN(left, 1024);
     if (size <= 0)

         return AVERROR_EOF;
 
     ret = av_get_packet(s->pb, pkt, size);
     if (ret < 0)
         return ret;
 
     pkt->stream_index = 0;
 
     return ret;
 }
 
 AVInputFormat ff_dtshd_demuxer = {
     .name           = "dtshd",
     .long_name      = NULL_IF_CONFIG_SMALL("raw DTS-HD"),
     .priv_data_size = sizeof(DTSHDDemuxContext),
     .read_probe     = dtshd_probe,
     .read_header    = dtshd_read_header,
     .read_packet    = raw_read_packet,
     .flags          = AVFMT_GENERIC_INDEX,
     .extensions     = "dtshd",
     .raw_codec_id   = AV_CODEC_ID_DTS,
 };