/*
  * THP Demuxer

  * Copyright (c) 2007 Marco Gerards

  *
  * 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/intfloat.h"

 #include "avformat.h"

 #include "internal.h"

 
 typedef struct ThpDemuxContext {
     int              version;
     int              first_frame;
     int              first_framesz;
     int              last_frame;
     int              compoff;
     int              framecnt;
     AVRational       fps;
     int              frame;
     int              next_frame;
     int              next_framesz;
     int              video_stream_index;

     int              audio_stream_index;

     int              compcount;
     unsigned char    components[16];
     AVStream*        vst;
     int              has_audio;

     unsigned         audiosize;

 } ThpDemuxContext;
 
 
 static int thp_probe(AVProbeData *p)
 {
     /* check file header */
     if (AV_RL32(p->buf) == MKTAG('T', 'H', 'P', '\0'))
         return AVPROBE_SCORE_MAX;
     else
         return 0;
 }
 

 static int thp_read_header(AVFormatContext *s)

 {

     ThpDemuxContext *thp = s->priv_data;
     AVStream *st;

     AVIOContext *pb = s->pb;

     int64_t fsize= avio_size(pb);

     int i;
 
     /* Read the file header.  */

                            avio_rb32(pb); /* Skip Magic.  */
     thp->version         = avio_rb32(pb);

                            avio_rb32(pb); /* Max buf size.  */
                            avio_rb32(pb); /* Max samples.  */

     thp->fps             = av_d2q(av_int2float(avio_rb32(pb)), INT_MAX);

     thp->framecnt        = avio_rb32(pb);
     thp->first_framesz   = avio_rb32(pb);

     pb->maxsize          = avio_rb32(pb);
     if(fsize>0 && (!pb->maxsize || fsize < pb->maxsize))
         pb->maxsize= fsize;

     thp->compoff         = avio_rb32(pb);
                            avio_rb32(pb); /* offsetDataOffset.  */
     thp->first_frame     = avio_rb32(pb);
     thp->last_frame      = avio_rb32(pb);

 
     thp->next_framesz    = thp->first_framesz;
     thp->next_frame      = thp->first_frame;
 
     /* Read the component structure.  */

     avio_seek (pb, thp->compoff, SEEK_SET);

     thp->compcount       = avio_rb32(pb);

 
     /* Read the list of component types.  */

     avio_read(pb, thp->components, 16);

 
     for (i = 0; i < thp->compcount; i++) {
         if (thp->components[i] == 0) {
             if (thp->vst != 0)
                 break;
 
             /* Video component.  */

             st = avformat_new_stream(s, NULL);

             if (!st)

                 return AVERROR(ENOMEM);

 
             /* The denominator and numerator are switched because 1/fps
                is required.  */

             avpriv_set_pts_info(st, 64, thp->fps.den, thp->fps.num);

             st->codec->codec_type = AVMEDIA_TYPE_VIDEO;

             st->codec->codec_id = AV_CODEC_ID_THP;

             st->codec->codec_tag = 0;  /* no fourcc */

             st->codec->width = avio_rb32(pb);
             st->codec->height = avio_rb32(pb);

             st->codec->sample_rate = av_q2d(thp->fps);

             st->nb_frames =
             st->duration = thp->framecnt;

             thp->vst = st;
             thp->video_stream_index = st->index;
 
             if (thp->version == 0x11000)

                 avio_rb32(pb); /* Unknown.  */

         } else if (thp->components[i] == 1) {
             if (thp->has_audio != 0)
                 break;
 
             /* Audio component.  */

             st = avformat_new_stream(s, NULL);

             if (!st)

                 return AVERROR(ENOMEM);

             st->codec->codec_type = AVMEDIA_TYPE_AUDIO;

             st->codec->codec_id = AV_CODEC_ID_ADPCM_THP;

             st->codec->codec_tag = 0;  /* no fourcc */

             st->codec->channels    = avio_rb32(pb); /* numChannels.  */
             st->codec->sample_rate = avio_rb32(pb); /* Frequency.  */

             avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);

 
             thp->audio_stream_index = st->index;
             thp->has_audio = 1;

         }
     }
 

     return 0;

 }
 
 static int thp_read_packet(AVFormatContext *s,
                             AVPacket *pkt)
 {
     ThpDemuxContext *thp = s->priv_data;

     AVIOContext *pb = s->pb;

     unsigned int size;

     int ret;
 

     if (thp->audiosize == 0) {

         /* Terminate when last frame is reached.  */
         if (thp->frame >= thp->framecnt)

             return AVERROR_EOF;

         avio_seek(pb, thp->next_frame, SEEK_SET);

         /* Locate the next frame and read out its size.  */
         thp->next_frame += thp->next_framesz;

         thp->next_framesz = avio_rb32(pb);

                         avio_rb32(pb); /* Previous total size.  */
         size          = avio_rb32(pb); /* Total size of this frame.  */

         /* Store the audiosize so the next time this function is called,
            the audio can be read.  */
         if (thp->has_audio)

             thp->audiosize = avio_rb32(pb); /* Audio size.  */

         else
             thp->frame++;

         ret = av_get_packet(pb, pkt, size);
         if (ret != size) {
             av_free_packet(pkt);

             return AVERROR(EIO);

         }

         pkt->stream_index = thp->video_stream_index;
     } else {

         ret = av_get_packet(pb, pkt, thp->audiosize);
         if (ret != thp->audiosize) {
             av_free_packet(pkt);

             return AVERROR(EIO);

         }
 
         pkt->stream_index = thp->audio_stream_index;

         if (thp->audiosize >= 8)
             pkt->duration = AV_RB32(&pkt->data[4]);
 

         thp->audiosize = 0;
         thp->frame++;
     }

 
     return 0;
 }
 

 AVInputFormat ff_thp_demuxer = {

     .name           = "thp",
     .long_name      = NULL_IF_CONFIG_SMALL("THP"),
     .priv_data_size = sizeof(ThpDemuxContext),
     .read_probe     = thp_probe,
     .read_header    = thp_read_header,
     .read_packet    = thp_read_packet

 };