/*
  * Copyright (c) 2008 Jaikrishnan Menon <realityman@gmx.net>

  * Copyright (c) 2010 Peter Ross <pross@xvid.org>

  * Copyright (c) 2010 Sebastian Vater <cdgs.basty@googlemail.com>

  *
  * 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
  */
 
 /**

  * @file

  * IFF file demuxer

  * by Jaikrishnan Menon
  * for more information on the .iff file format, visit:
  * http://wiki.multimedia.cx/index.php?title=IFF
  */
 

 #include "libavcodec/bytestream.h"

 #include "libavutil/intreadwrite.h"

 #include "libavutil/dict.h"

 #include "avformat.h"
 
 #define ID_8SVX       MKTAG('8','S','V','X')
 #define ID_VHDR       MKTAG('V','H','D','R')
 #define ID_ATAK       MKTAG('A','T','A','K')
 #define ID_RLSE       MKTAG('R','L','S','E')
 #define ID_CHAN       MKTAG('C','H','A','N')

 #define ID_PBM        MKTAG('P','B','M',' ')
 #define ID_ILBM       MKTAG('I','L','B','M')
 #define ID_BMHD       MKTAG('B','M','H','D')

 #define ID_CAMG       MKTAG('C','A','M','G')

 #define ID_CMAP       MKTAG('C','M','A','P')

 
 #define ID_FORM       MKTAG('F','O','R','M')
 #define ID_ANNO       MKTAG('A','N','N','O')
 #define ID_AUTH       MKTAG('A','U','T','H')
 #define ID_CHRS       MKTAG('C','H','R','S')
 #define ID_COPYRIGHT  MKTAG('(','c',')',' ')
 #define ID_CSET       MKTAG('C','S','E','T')
 #define ID_FVER       MKTAG('F','V','E','R')
 #define ID_NAME       MKTAG('N','A','M','E')
 #define ID_TEXT       MKTAG('T','E','X','T')
 #define ID_BODY       MKTAG('B','O','D','Y')

 #define ID_ANNO       MKTAG('A','N','N','O')

 
 #define LEFT    2
 #define RIGHT   4
 #define STEREO  6
 

 /**
  * This number of bytes if added at the beginning of each AVPacket
  * which contain additional information about video properties
  * which has to be shared between demuxer and decoder.
  * This number may change between frames, e.g. the demuxer might
  * set it to smallest possible size of 2 to indicate that there's
  * no extradata changing in this frame.
  */
 #define IFF_EXTRA_VIDEO_SIZE 9
 

 typedef enum {
     COMP_NONE,
     COMP_FIB,
     COMP_EXP
 } svx8_compression_type;
 
 typedef enum {
     BITMAP_RAW,
     BITMAP_BYTERUN1
 } bitmap_compression_type;

 
 typedef struct {

     uint64_t  body_pos;

     uint32_t  body_size;
     uint32_t  sent_bytes;
     uint32_t  audio_frame_count;

     svx8_compression_type   svx8_compression;
     bitmap_compression_type bitmap_compression;  ///< delta compression method used

     unsigned  bpp;          ///< bits per plane to decode (differs from bits_per_coded_sample if HAM)
     unsigned  ham;          ///< 0 if non-HAM or number of hold bits (6 for bpp > 6, 4 otherwise)
     unsigned  flags;        ///< 1 for EHB, 0 is no extra half darkening
     unsigned  transparency; ///< transparency color index in palette
     unsigned  masking;      ///< masking method used

 } IffDemuxContext;
 

 /* Metadata string read */
 static int get_metadata(AVFormatContext *s,
                         const char *const tag,
                         const unsigned data_size)
 {
     uint8_t *buf = ((data_size + 1) == 0) ? NULL : av_malloc(data_size + 1);
 
     if (!buf)
         return AVERROR(ENOMEM);
 

     if (avio_read(s->pb, buf, data_size) < 0) {

         av_free(buf);
         return AVERROR(EIO);
     }
     buf[data_size] = 0;

     av_dict_set(&s->metadata, tag, buf, AV_DICT_DONT_STRDUP_VAL);

     return 0;
 }
 

 static int iff_probe(AVProbeData *p)
 {
     const uint8_t *d = p->buf;
 
     if ( AV_RL32(d)   == ID_FORM &&

          (AV_RL32(d+8) == ID_8SVX || AV_RL32(d+8) == ID_PBM || AV_RL32(d+8) == ID_ILBM) )

         return AVPROBE_SCORE_MAX;
     return 0;
 }
 
 static int iff_read_header(AVFormatContext *s,
                            AVFormatParameters *ap)
 {
     IffDemuxContext *iff = s->priv_data;

     AVIOContext *pb = s->pb;

     AVStream *st;

     uint8_t *buf;

     uint32_t chunk_id, data_size;

     uint32_t screenmode = 0;
     unsigned transparency = 0;
     unsigned masking = 0; // no mask

 
     st = av_new_stream(s, 0);
     if (!st)

         return AVERROR(ENOMEM);

 
     st->codec->channels = 1;

     avio_skip(pb, 8);

     // codec_tag used by ByteRun1 decoder to distinguish progressive (PBM) and interlaced (ILBM) content

     st->codec->codec_tag = avio_rl32(pb);

     while(!url_feof(pb)) {
         uint64_t orig_pos;

         int res;
         const char *metadata_tag = NULL;

         chunk_id = avio_rl32(pb);
         data_size = avio_rb32(pb);

         orig_pos = avio_tell(pb);

 
         switch(chunk_id) {
         case ID_VHDR:

             st->codec->codec_type = AVMEDIA_TYPE_AUDIO;

 
             if (data_size < 14)
                 return AVERROR_INVALIDDATA;

             avio_skip(pb, 12);

             st->codec->sample_rate = avio_rb16(pb);

             if (data_size >= 16) {

                 avio_skip(pb, 1);

                 iff->svx8_compression = avio_r8(pb);

             }

             break;
 
         case ID_BODY:

             iff->body_pos = avio_tell(pb);

             iff->body_size = data_size;
             break;
 
         case ID_CHAN:

             if (data_size < 4)
                 return AVERROR_INVALIDDATA;

             st->codec->channels = (avio_rb32(pb) < 6) ? 1 : 2;

             break;
 

         case ID_CAMG:
             if (data_size < 4)
                 return AVERROR_INVALIDDATA;
             screenmode                = avio_rb32(pb);
             break;
 

         case ID_CMAP:

             st->codec->extradata_size = data_size + IFF_EXTRA_VIDEO_SIZE;
             st->codec->extradata      = av_malloc(data_size + IFF_EXTRA_VIDEO_SIZE + FF_INPUT_BUFFER_PADDING_SIZE);

             if (!st->codec->extradata)
                 return AVERROR(ENOMEM);

             if (avio_read(pb, st->codec->extradata + IFF_EXTRA_VIDEO_SIZE, data_size) < 0)

                 return AVERROR(EIO);
             break;
 
         case ID_BMHD:

             iff->bitmap_compression = -1;

             st->codec->codec_type            = AVMEDIA_TYPE_VIDEO;

             if (data_size <= 8)
                 return AVERROR_INVALIDDATA;

             st->codec->width                 = avio_rb16(pb);
             st->codec->height                = avio_rb16(pb);

             avio_skip(pb, 4); // x, y offset

             st->codec->bits_per_coded_sample = avio_r8(pb);

             if (data_size >= 10)
                 masking                      = avio_r8(pb);
             if (data_size >= 11)

                 iff->bitmap_compression      = avio_r8(pb);

             if (data_size >= 14) {
                 avio_skip(pb, 1); // padding
                 transparency                 = avio_rb16(pb);

             }
             if (data_size >= 16) {

                 st->sample_aspect_ratio.num  = avio_r8(pb);
                 st->sample_aspect_ratio.den  = avio_r8(pb);

             }

             break;
 

         case ID_ANNO:

         case ID_TEXT:      metadata_tag = "comment";   break;
         case ID_AUTH:      metadata_tag = "artist";    break;
         case ID_COPYRIGHT: metadata_tag = "copyright"; break;
         case ID_NAME:      metadata_tag = "title";     break;

         }

         if (metadata_tag) {
             if ((res = get_metadata(s, metadata_tag, data_size)) < 0) {

                 av_log(s, AV_LOG_ERROR, "cannot allocate metadata tag %s!", metadata_tag);

                 return res;
             }
         }

         avio_skip(pb, data_size - (avio_tell(pb) - orig_pos) + (data_size & 1));

     }
 

     avio_seek(pb, iff->body_pos, SEEK_SET);

     switch(st->codec->codec_type) {

     case AVMEDIA_TYPE_AUDIO:

         av_set_pts_info(st, 32, 1, st->codec->sample_rate);

         switch (iff->svx8_compression) {

         case COMP_NONE:

             st->codec->codec_id = CODEC_ID_8SVX_RAW;

             break;
         case COMP_FIB:
             st->codec->codec_id = CODEC_ID_8SVX_FIB;
             break;
         case COMP_EXP:
             st->codec->codec_id = CODEC_ID_8SVX_EXP;
             break;
         default:

             av_log(s, AV_LOG_ERROR,
                    "Unknown SVX8 compression method '%d'\n", iff->svx8_compression);

             return -1;
         }

         st->codec->bits_per_coded_sample = iff->svx8_compression == COMP_NONE ? 8 : 4;

         st->codec->bit_rate = st->codec->channels * st->codec->sample_rate * st->codec->bits_per_coded_sample;
         st->codec->block_align = st->codec->channels * st->codec->bits_per_coded_sample;
         break;

     case AVMEDIA_TYPE_VIDEO:

         iff->bpp          = st->codec->bits_per_coded_sample;
         if ((screenmode & 0x800 /* Hold And Modify */) && iff->bpp <= 8) {
             iff->ham      = iff->bpp > 6 ? 6 : 4;
             st->codec->bits_per_coded_sample = 24;
         }
         iff->flags        = (screenmode & 0x80 /* Extra HalfBrite */) && iff->bpp <= 8;
         iff->masking      = masking;
         iff->transparency = transparency;
 
         if (!st->codec->extradata) {
             st->codec->extradata_size = IFF_EXTRA_VIDEO_SIZE;
             st->codec->extradata      = av_malloc(IFF_EXTRA_VIDEO_SIZE + FF_INPUT_BUFFER_PADDING_SIZE);
             if (!st->codec->extradata)
                 return AVERROR(ENOMEM);
         }
         buf = st->codec->extradata;
         bytestream_put_be16(&buf, IFF_EXTRA_VIDEO_SIZE);

         bytestream_put_byte(&buf, iff->bitmap_compression);

         bytestream_put_byte(&buf, iff->bpp);
         bytestream_put_byte(&buf, iff->ham);
         bytestream_put_byte(&buf, iff->flags);
         bytestream_put_be16(&buf, iff->transparency);
         bytestream_put_byte(&buf, iff->masking);
 

         switch (iff->bitmap_compression) {

         case BITMAP_RAW:

             st->codec->codec_id = CODEC_ID_IFF_ILBM;

             break;
         case BITMAP_BYTERUN1:
             st->codec->codec_id = CODEC_ID_IFF_BYTERUN1;
             break;
         default:

             av_log(s, AV_LOG_ERROR,
                    "Unknown bitmap compression method '%d'\n", iff->bitmap_compression);

             return AVERROR_INVALIDDATA;
         }
         break;
     default:
         return -1;
     }

 
     return 0;
 }
 
 static int iff_read_packet(AVFormatContext *s,
                            AVPacket *pkt)
 {
     IffDemuxContext *iff = s->priv_data;

     AVIOContext *pb = s->pb;

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

     int ret;
 

     if(iff->sent_bytes >= iff->body_size)

         return AVERROR(EIO);

     if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
         ret = av_get_packet(pb, pkt, iff->body_size);

     } else if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {

         uint8_t *buf;
 
         if (av_new_packet(pkt, iff->body_size + 2) < 0) {
             return AVERROR(ENOMEM);
         }
 
         buf = pkt->data;
         bytestream_put_be16(&buf, 2);
         ret = avio_read(pb, buf, iff->body_size);

     } else {
         av_abort();

     }

 
     if(iff->sent_bytes == 0)

         pkt->flags |= AV_PKT_FLAG_KEY;

     iff->sent_bytes = iff->body_size;

 
     pkt->stream_index = 0;
     return ret;
 }
 

 AVInputFormat ff_iff_demuxer = {

     "IFF",

     NULL_IF_CONFIG_SMALL("IFF format"),

     sizeof(IffDemuxContext),
     iff_probe,
     iff_read_header,
     iff_read_packet,
 };