/*
  * TTA demuxer
  * Copyright (c) 2006 Alex Beregszaszi
  *

  * 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 "libavcodec/get_bits.h"

 #include "avformat.h"

 #include "internal.h"

 #include "id3v1.h"

 #include "libavutil/dict.h"

 
 typedef struct {
     int totalframes, currentframe;
 } TTAContext;
 
 static int tta_probe(AVProbeData *p)
 {
     const uint8_t *d = p->buf;

     if (d[0] == 'T' && d[1] == 'T' && d[2] == 'A' && d[3] == '1')
         return 80;
     return 0;
 }
 
 static int tta_read_header(AVFormatContext *s, AVFormatParameters *ap)
 {
     TTAContext *c = s->priv_data;
     AVStream *st;

     int i, channels, bps, samplerate, datalen, framelen;

     uint64_t framepos, start_offset;
 

     if (!av_dict_get(s->metadata, "", NULL, AV_DICT_IGNORE_SUFFIX))

         ff_id3v1_read(s);

     start_offset = avio_tell(s->pb);

     if (avio_rl32(s->pb) != AV_RL32("TTA1"))

         return -1; // not tta file
 

     avio_skip(s->pb, 2); // FIXME: flags

     channels = avio_rl16(s->pb);
     bps = avio_rl16(s->pb);
     samplerate = avio_rl32(s->pb);

     if(samplerate <= 0 || samplerate > 1000000){
         av_log(s, AV_LOG_ERROR, "nonsense samplerate\n");
         return -1;
     }
 

     datalen = avio_rl32(s->pb);

     if(datalen < 0){
         av_log(s, AV_LOG_ERROR, "nonsense datalen\n");
         return -1;
     }
 

     avio_skip(s->pb, 4); // header crc

     framelen = samplerate*256/245;

     c->totalframes = datalen / framelen + ((datalen % framelen) ? 1 : 0);
     c->currentframe = 0;
 

     if(c->totalframes >= UINT_MAX/sizeof(uint32_t) || c->totalframes <= 0){
         av_log(s, AV_LOG_ERROR, "totalframes %d invalid\n", c->totalframes);

         return -1;
     }

     st = avformat_new_stream(s, NULL);

     if (!st)

         return AVERROR(ENOMEM);

     avpriv_set_pts_info(st, 64, 1, samplerate);

     st->start_time = 0;
     st->duration = datalen;
 

     framepos = avio_tell(s->pb) + 4*c->totalframes + 4;

 
     for (i = 0; i < c->totalframes; i++) {

         uint32_t size = avio_rl32(s->pb);

         av_add_index_entry(st, framepos, i*framelen, size, 0, AVINDEX_KEYFRAME);
         framepos += size;
     }

     avio_skip(s->pb, 4); // seektable crc

     st->codec->codec_type = AVMEDIA_TYPE_AUDIO;

     st->codec->codec_id = CODEC_ID_TTA;
     st->codec->channels = channels;
     st->codec->sample_rate = samplerate;

     st->codec->bits_per_coded_sample = bps;

     st->codec->extradata_size = avio_tell(s->pb) - start_offset;

     if(st->codec->extradata_size+FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)st->codec->extradata_size){

         //this check is redundant as avio_read should fail

         av_log(s, AV_LOG_ERROR, "extradata_size too large\n");
         return -1;
     }

     st->codec->extradata = av_mallocz(st->codec->extradata_size+FF_INPUT_BUFFER_PADDING_SIZE);

     if (!st->codec->extradata) {
         st->codec->extradata_size = 0;
         return AVERROR(ENOMEM);
     }

     avio_seek(s->pb, start_offset, SEEK_SET);

     avio_read(s->pb, st->codec->extradata, st->codec->extradata_size);

 
     return 0;
 }
 
 static int tta_read_packet(AVFormatContext *s, AVPacket *pkt)
 {
     TTAContext *c = s->priv_data;

     AVStream *st = s->streams[0];

     int size, ret;

 
     // FIXME!

     if (c->currentframe >= c->totalframes)

         return AVERROR_EOF;

     size = st->index_entries[c->currentframe].size;

     ret = av_get_packet(s->pb, pkt, size);

     pkt->dts = st->index_entries[c->currentframe++].timestamp;
     return ret;

 }
 

 static int tta_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
 {
     TTAContext *c = s->priv_data;
     AVStream *st = s->streams[stream_index];
     int index = av_index_search_timestamp(st, timestamp, flags);
     if (index < 0)
         return -1;

     if (avio_seek(s->pb, st->index_entries[index].pos, SEEK_SET) < 0)
         return -1;

 
     c->currentframe = index;
 
     return 0;
 }
 

 AVInputFormat ff_tta_demuxer = {

     .name           = "tta",
     .long_name      = NULL_IF_CONFIG_SMALL("True Audio"),
     .priv_data_size = sizeof(TTAContext),
     .read_probe     = tta_probe,
     .read_header    = tta_read_header,
     .read_packet    = tta_read_packet,
     .read_seek      = tta_read_seek,

     .extensions = "tta",
 };