/*
  * Sega FILM Format (CPK) Demuxer

  * Copyright (c) 2003 The FFmpeg Project

  *

  * 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

  * Sega FILM (.cpk) file demuxer
  * by Mike Melanson (melanson@pcisys.net)
  * For more information regarding the Sega FILM file format, visit:
  *   http://www.pcisys.net/~melanson/codecs/
  */
 

 #include "libavutil/intreadwrite.h"

 #include "avformat.h"

 #include "internal.h"

 #include "avio_internal.h"

 #define FILM_TAG MKBETAG('F', 'I', 'L', 'M')
 #define FDSC_TAG MKBETAG('F', 'D', 'S', 'C')
 #define STAB_TAG MKBETAG('S', 'T', 'A', 'B')
 #define CVID_TAG MKBETAG('c', 'v', 'i', 'd')

 #define RAW_TAG  MKBETAG('r', 'a', 'w', ' ')

 
 typedef struct {
   int stream;

   int64_t sample_offset;

   unsigned int sample_size;
   int64_t pts;
   int keyframe;

 } film_sample;

 
 typedef struct FilmDemuxContext {
     int video_stream_index;
     int audio_stream_index;
 

     enum AVCodecID audio_type;

     unsigned int audio_samplerate;
     unsigned int audio_bits;
     unsigned int audio_channels;
 

     enum AVCodecID video_type;

     unsigned int sample_count;

     film_sample *sample_table;

     unsigned int current_sample;
 
     unsigned int base_clock;
     unsigned int version;
 } FilmDemuxContext;
 
 static int film_probe(AVProbeData *p)
 {

     if (AV_RB32(&p->buf[0]) != FILM_TAG)

         return 0;
 

     if (AV_RB32(&p->buf[16]) != FDSC_TAG)
         return 0;
 

     return AVPROBE_SCORE_MAX;
 }
 

 static int film_read_close(AVFormatContext *s)
 {
     FilmDemuxContext *film = s->priv_data;
 
     av_freep(&film->sample_table);
 
     return 0;
 }
 

 static int film_read_header(AVFormatContext *s)

 {

     FilmDemuxContext *film = s->priv_data;

     AVIOContext *pb = s->pb;

     AVStream *st;
     unsigned char scratch[256];

     int i, ret;

     unsigned int data_offset;
     unsigned int audio_frame_counter;
 
     film->sample_table = NULL;
 
     /* load the main FILM header */

     if (avio_read(pb, scratch, 16) != 16)

         return AVERROR(EIO);

     data_offset = AV_RB32(&scratch[4]);
     film->version = AV_RB32(&scratch[8]);

 
     /* load the FDSC chunk */
     if (film->version == 0) {
         /* special case for Lemmings .film files; 20-byte header */

         if (avio_read(pb, scratch, 20) != 20)

             return AVERROR(EIO);

         /* make some assumptions about the audio parameters */

         film->audio_type = AV_CODEC_ID_PCM_S8;

         film->audio_samplerate = 22050;
         film->audio_channels = 1;
         film->audio_bits = 8;
     } else {
         /* normal Saturn .cpk files; 32-byte header */

         if (avio_read(pb, scratch, 32) != 32)

             return AVERROR(EIO);

         film->audio_samplerate = AV_RB16(&scratch[24]);

         film->audio_channels = scratch[21];
         film->audio_bits = scratch[22];

         if (scratch[23] == 2 && film->audio_channels > 0)

             film->audio_type = AV_CODEC_ID_ADPCM_ADX;

         else if (film->audio_channels > 0) {
             if (film->audio_bits == 8)

                 film->audio_type = AV_CODEC_ID_PCM_S8_PLANAR;

             else if (film->audio_bits == 16)

                 film->audio_type = AV_CODEC_ID_PCM_S16BE_PLANAR;

             else

                 film->audio_type = AV_CODEC_ID_NONE;

         } else

             film->audio_type = AV_CODEC_ID_NONE;

     }
 

     if (AV_RB32(&scratch[0]) != FDSC_TAG)

         return AVERROR_INVALIDDATA;
 

     if (AV_RB32(&scratch[8]) == CVID_TAG) {

         film->video_type = AV_CODEC_ID_CINEPAK;

     } else if (AV_RB32(&scratch[8]) == RAW_TAG) {

         film->video_type = AV_CODEC_ID_RAWVIDEO;

     } else {

         film->video_type = AV_CODEC_ID_NONE;

     }

 
     /* initialize the decoder streams */
     if (film->video_type) {

         st = avformat_new_stream(s, NULL);

         if (!st)

             return AVERROR(ENOMEM);

         film->video_stream_index = st->index;

         st->codec->codec_type = AVMEDIA_TYPE_VIDEO;

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

         st->codec->width = AV_RB32(&scratch[16]);
         st->codec->height = AV_RB32(&scratch[12]);

         if (film->video_type == AV_CODEC_ID_RAWVIDEO) {

             if (scratch[20] == 24) {

                 st->codec->pix_fmt = AV_PIX_FMT_RGB24;

             } else {
                 av_log(s, AV_LOG_ERROR, "raw video is using unhandled %dbpp\n", scratch[20]);
                 return -1;
             }
         }

     }
 
     if (film->audio_type) {

         st = avformat_new_stream(s, NULL);

         if (!st)

             return AVERROR(ENOMEM);

         film->audio_stream_index = st->index;

         st->codec->codec_type = AVMEDIA_TYPE_AUDIO;

         st->codec->codec_id = film->audio_type;
         st->codec->codec_tag = 1;
         st->codec->channels = film->audio_channels;
         st->codec->sample_rate = film->audio_samplerate;

         if (film->audio_type == AV_CODEC_ID_ADPCM_ADX) {

             st->codec->bits_per_coded_sample = 18 * 8 / 32;
             st->codec->block_align = st->codec->channels * 18;

             st->need_parsing = AVSTREAM_PARSE_FULL;

         } else {
             st->codec->bits_per_coded_sample = film->audio_bits;
             st->codec->block_align = st->codec->channels *
                 st->codec->bits_per_coded_sample / 8;
         }
 

         st->codec->bit_rate = st->codec->channels * st->codec->sample_rate *

             st->codec->bits_per_coded_sample;

     }
 
     /* load the sample table */

     if (avio_read(pb, scratch, 16) != 16)

         return AVERROR(EIO);

     if (AV_RB32(&scratch[0]) != STAB_TAG)

         return AVERROR_INVALIDDATA;

     film->base_clock = AV_RB32(&scratch[8]);
     film->sample_count = AV_RB32(&scratch[12]);

     if(film->sample_count >= UINT_MAX / sizeof(film_sample))

         return -1;

     film->sample_table = av_malloc(film->sample_count * sizeof(film_sample));

     if (!film->sample_table)
         return AVERROR(ENOMEM);

     for (i = 0; i < s->nb_streams; i++) {
         st = s->streams[i];
         if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO)
             avpriv_set_pts_info(st, 33, 1, film->base_clock);
         else
             avpriv_set_pts_info(st, 64, 1, film->audio_samplerate);
     }

     audio_frame_counter = 0;
     for (i = 0; i < film->sample_count; i++) {
         /* load the next sample record and transfer it to an internal struct */

         if (avio_read(pb, scratch, 16) != 16) {

             ret = AVERROR(EIO);
             goto fail;

         }

         film->sample_table[i].sample_offset =

             data_offset + AV_RB32(&scratch[0]);
         film->sample_table[i].sample_size = AV_RB32(&scratch[4]);

         if (film->sample_table[i].sample_size > INT_MAX / 4) {
             ret = AVERROR_INVALIDDATA;
             goto fail;
         }

         if (AV_RB32(&scratch[8]) == 0xFFFFFFFF) {

             film->sample_table[i].stream = film->audio_stream_index;
             film->sample_table[i].pts = audio_frame_counter;
 

             if (film->audio_type == AV_CODEC_ID_ADPCM_ADX)

                 audio_frame_counter += (film->sample_table[i].sample_size * 32 /
                     (18 * film->audio_channels));

             else if (film->audio_type != AV_CODEC_ID_NONE)

                 audio_frame_counter += (film->sample_table[i].sample_size /
                     (film->audio_channels * film->audio_bits / 8));

         } else {
             film->sample_table[i].stream = film->video_stream_index;

             film->sample_table[i].pts = AV_RB32(&scratch[8]) & 0x7FFFFFFF;

             film->sample_table[i].keyframe = (scratch[8] & 0x80) ? 0 : 1;
         }
     }
 
     film->current_sample = 0;
 
     return 0;

 fail:
     film_read_close(s);
     return ret;

 }
 
 static int film_read_packet(AVFormatContext *s,
                             AVPacket *pkt)
 {

     FilmDemuxContext *film = s->priv_data;

     AVIOContext *pb = s->pb;

     film_sample *sample;

     int ret = 0;
 
     if (film->current_sample >= film->sample_count)

         return AVERROR_EOF;

 
     sample = &film->sample_table[film->current_sample];
 
     /* position the stream (will probably be there anyway) */

     avio_seek(pb, sample->sample_offset, SEEK_SET);

 
     ret= av_get_packet(pb, pkt, sample->sample_size);
     if (ret != sample->sample_size)
         ret = AVERROR(EIO);

 
     pkt->stream_index = sample->stream;
     pkt->pts = sample->pts;
 
     film->current_sample++;
 
     return ret;
 }
 

 AVInputFormat ff_segafilm_demuxer = {

     .name           = "film_cpk",

     .long_name      = NULL_IF_CONFIG_SMALL("Sega FILM / CPK"),

     .priv_data_size = sizeof(FilmDemuxContext),
     .read_probe     = film_probe,
     .read_header    = film_read_header,
     .read_packet    = film_read_packet,
     .read_close     = film_read_close,

 };