/*
 * Copyright (C) 2000-2002 the xine project
 *
 * This file is part of xine, a unix video player.
 *
 * xine is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * xine 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA
 *
 * CIN File Demuxer by Mike Melanson (melanson@pcisys.net)
 * For more information regarding the Id CIN file format, visit:
 *   http://www.csse.monash.edu.au/~timf/
 *
 * CIN is a somewhat quirky and ill-defined format. Here are some notes
 * for anyone trying to understand the technical details of this format:
 *
 * The format has no definite file signature. This is problematic for a
 * general-purpose media player that wants to automatically detect file
 * types. However, a CIN file does start with 5 32-bit numbers that
 * specify audio and video parameters. This demuxer gets around the lack
 * of file signature by performing sanity checks on those parameters.
 * Probabalistically, this is a reasonable solution since the number of
 * valid combinations of the 5 parameters is a very small subset of the
 * total 160-bit number space.
 *
 * Refer to the function demux_idcin_open() for the precise A/V parameters
 * that this demuxer allows.
 *
 * Next, each audio and video frame has a duration of 1/14 sec. If the
 * audio sample rate is a multiple of the common frequency 22050 Hz it will
 * divide evenly by 14. However, if the sample rate is 11025 Hz:
 *   11025 (samples/sec) / 14 (frames/sec) = 787.5 (samples/frame)
 * The way the CIN stores audio in this case is by storing 787 sample
 * frames in the first audio frame and 788 sample frames in the second
 * audio frame. Therefore, the total number of bytes in an audio frame
 * is given as:
 *   audio frame #0: 787 * (bytes/sample) * (# channels) bytes in frame
 *   audio frame #1: 788 * (bytes/sample) * (# channels) bytes in frame
 *   audio frame #2: 787 * (bytes/sample) * (# channels) bytes in frame
 *   audio frame #3: 788 * (bytes/sample) * (# channels) bytes in frame
 *
 * Finally, not all Id CIN creation tools agree on the resolution of the
 * color palette, apparently. Some creation tools specify red, green, and
 * blue palette components in terms of 6-bit VGA color DAC values which
 * range from 0..63. Other tools specify the RGB components as full 8-bit
 * values that range from 0..255. Since there are no markers in the file to
 * differentiate between the two variants, this demuxer uses the following
 * heuristic:
 *   - load the 768 palette bytes from disk
 *   - assume that they will need to be shifted left by 2 bits to
 *     transform them from 6-bit values to 8-bit values
 *   - scan through all 768 palette bytes
 *     - if any bytes exceed 63, do not shift the bytes at all before
 *       transmitting them to the video decoder
 *
 * $Id: demux_idcin.c,v 1.6 2002/09/01 14:06:23 tmmm Exp $
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#include <pthread.h>
#include <string.h>
#include <stdlib.h>

#include "xine_internal.h"
#include "xineutils.h"
#include "compat.h"
#include "demux.h"
#include "bswap.h"

#define LE_16(x) (le2me_16(*(unsigned short *)(x)))
#define LE_32(x) (le2me_32(*(unsigned int *)(x)))

#define VALID_ENDS   "cin"
#define IDCIN_HEADER_SIZE 20
#define HUFFMAN_TABLE_SIZE 65536
#define IDCIN_FRAME_PTS_INC  (90000 / 14)
#define PALETTE_SIZE 256

typedef struct {

  demux_plugin_t       demux_plugin;

  xine_t              *xine;

  config_values_t     *config;

  fifo_buffer_t       *video_fifo;
  fifo_buffer_t       *audio_fifo;

  input_plugin_t      *input;

  pthread_t            thread;
  int                  thread_running;
  pthread_mutex_t      mutex;
  int                  send_end_buffers;

  off_t                start;
  off_t                filesize;
  int                  status;

  unsigned int         video_width;
  unsigned int         video_height;
  unsigned int         audio_sample_rate;
  unsigned int         audio_bytes_per_sample;
  unsigned int         audio_channels;

  int                  audio_chunk_size1;
  int                  audio_chunk_size2;

  unsigned char        huffman_table[HUFFMAN_TABLE_SIZE];

} demux_idcin_t;

static void *demux_idcin_loop (void *this_gen) {

  demux_idcin_t *this = (demux_idcin_t *) this_gen;
  buf_element_t *buf = NULL;
  unsigned int command;
  off_t current_file_pos;
  unsigned char preamble[8];
  unsigned char disk_palette[PALETTE_SIZE * 3];
  palette_entry_t palette[PALETTE_SIZE];
  int i;
  unsigned int remaining_sample_bytes;
  uint64_t pts_counter = 0;
  int current_audio_chunk = 1;
  int scale_bits;

  pthread_mutex_lock( &this->mutex );

  /* reposition stream past the Huffman tables */
  this->input->seek(this->input, 0x14 + 0x10000, SEEK_SET);

  /* do-while needed to seek after demux finished */
  do {
    /* main demuxer loop */
    while (this->status == DEMUX_OK) {

      /* someone may want to interrupt us */
      pthread_mutex_unlock( &this->mutex );
      pthread_mutex_lock( &this->mutex );

      current_file_pos = this->input->get_current_pos(this->input);

      /* figure out what the next data is */
      if (this->input->read(this->input, (unsigned char *)&command, 4) != 4) {
        this->status = DEMUX_FINISHED;
        pthread_mutex_unlock(&this->mutex);
        break;
      }

      command = le2me_32(command);
      if (command == 2) {
        this->status = DEMUX_FINISHED;
        break;
      } else {
        if (command == 1) {
          /* load a 768-byte palette and pass it to the demuxer */
          if (this->input->read(this->input, disk_palette, PALETTE_SIZE * 3) !=
            PALETTE_SIZE * 3) {
            this->status = DEMUX_FINISHED;
            pthread_mutex_unlock(&this->mutex);
            break;
          }

          /* scan the palette to figure out if it's 6- or 8-bit;
           * assume 6-bit palette until a value > 63 is seen */
          scale_bits = 2;
          for (i = 0; i < PALETTE_SIZE * 3; i++)
            if (disk_palette[i] > 63) {
              scale_bits = 0;
              break;
            }

          /* convert palette to internal structure */
          for (i = 0; i < PALETTE_SIZE; i++) {
            /* these are VGA color DAC values, which means they only range
             * from 0..63; adjust as appropriate */
            palette[i].r = disk_palette[i * 3 + 0] << scale_bits;
            palette[i].g = disk_palette[i * 3 + 1] << scale_bits;
            palette[i].b = disk_palette[i * 3 + 2] << scale_bits;
          }

          buf = this->video_fifo->buffer_pool_alloc (this->video_fifo);
          buf->decoder_flags = BUF_FLAG_SPECIAL;
          buf->decoder_info[1] = BUF_SPECIAL_PALETTE;
          buf->decoder_info[2] = PALETTE_SIZE;
          buf->decoder_info[3] = (unsigned int)&palette;
          buf->size = 0;
          buf->type = BUF_VIDEO_IDCIN;
          this->video_fifo->put (this->video_fifo, buf);
        }
      }

      /* load the video frame */
      if (this->input->read(this->input, preamble, 8) != 8) {
        this->status = DEMUX_FINISHED;
        pthread_mutex_unlock(&this->mutex);
        break;
      }
      remaining_sample_bytes = LE_32(&preamble[0]) - 4;

      while (remaining_sample_bytes) {
        buf = this->video_fifo->buffer_pool_alloc (this->video_fifo);
        buf->type = BUF_VIDEO_IDCIN;
        buf->input_pos = this->input->get_current_pos(this->input);
        buf->input_length = this->filesize;
        buf->input_time = pts_counter / 90000;
        buf->pts = pts_counter;

        if (remaining_sample_bytes > buf->max_size)
          buf->size = buf->max_size;
        else
          buf->size = remaining_sample_bytes;
        remaining_sample_bytes -= buf->size;

        if (this->input->read(this->input, buf->content, buf->size) !=
          buf->size) {
          buf->free_buffer(buf);
          this->status = DEMUX_FINISHED;
          break;
        }

        /* all frames are intra-coded */
        buf->decoder_flags |= BUF_FLAG_KEYFRAME;
        if (!remaining_sample_bytes)
          buf->decoder_flags |= BUF_FLAG_FRAME_END;

        this->video_fifo->put(this->video_fifo, buf);
      }

      /* load the audio frame */
      if (this->audio_fifo && this->audio_sample_rate) {

        if (current_audio_chunk == 1) {
          remaining_sample_bytes = this->audio_chunk_size1;
          current_audio_chunk = 2;
        } else {
          remaining_sample_bytes = this->audio_chunk_size2;
          current_audio_chunk = 1;
        }

        while (remaining_sample_bytes) {
          buf = this->audio_fifo->buffer_pool_alloc (this->audio_fifo);
          buf->type = BUF_AUDIO_LPCM_LE;
          buf->input_pos = this->input->get_current_pos(this->input);
          buf->input_length = this->filesize;
          buf->input_time = pts_counter / 90000;
          buf->pts = pts_counter;

          if (remaining_sample_bytes > buf->max_size)
            buf->size = buf->max_size;
          else
            buf->size = remaining_sample_bytes;
          remaining_sample_bytes -= buf->size;

          if (this->input->read(this->input, buf->content, buf->size) !=
            buf->size) {
            buf->free_buffer(buf);
            this->status = DEMUX_FINISHED;
            break;
          }

          if (!remaining_sample_bytes)
            buf->decoder_flags |= BUF_FLAG_FRAME_END;

          this->audio_fifo->put(this->audio_fifo, buf);
        }
      }

      pts_counter += IDCIN_FRAME_PTS_INC;
    }

    /* wait before sending end buffers: user might want to do a new seek */
    while(this->send_end_buffers && this->video_fifo->size(this->video_fifo) &&
          this->status != DEMUX_OK){
      pthread_mutex_unlock( &this->mutex );
      xine_usec_sleep(100000);
      pthread_mutex_lock( &this->mutex );
    }

  } while (this->status == DEMUX_OK);

  printf ("demux_idcin: demux loop finished (status: %d)\n",
          this->status);

  this->status = DEMUX_FINISHED;

  if (this->send_end_buffers) {
    xine_demux_control_end(this->xine, BUF_FLAG_END_STREAM);
  }

  this->thread_running = 0;
  pthread_mutex_unlock(&this->mutex);
  return NULL;
}

static int demux_idcin_open(demux_plugin_t *this_gen,
                         input_plugin_t *input, int stage) {

  demux_idcin_t *this = (demux_idcin_t *) this_gen;
  char header[IDCIN_HEADER_SIZE];
  unsigned int current_value;

  this->input = input;

  switch(stage) {
  case STAGE_BY_CONTENT: {
    if ((input->get_capabilities(input) & INPUT_CAP_SEEKABLE) == 0)
      return DEMUX_CANNOT_HANDLE;

    input->seek(input, 0, SEEK_SET);
    if (input->read(input, header, IDCIN_HEADER_SIZE) != IDCIN_HEADER_SIZE)
      return DEMUX_CANNOT_HANDLE;

    /*
     * This is what you could call a "probabilistic" file check: Id CIN
     * files don't have a definite file signature. In lieu of such a marker,
     * perform sanity checks on the 5 header fields:
     *  width, height: greater than 0, less than or equal to 1024
     * audio sample rate: greater than or equal to 8000, less than or
     *  equal to 48000, or 0 for no audio
     * audio sample width (bytes/sample): 0 for no audio, or 1 or 2
     * audio channels: 0 for no audio, or 1 or 2
     */

    /* check the width */
    current_value = LE_32(&header[0]);
    if ((current_value == 0) || (current_value > 1024))
      return DEMUX_CANNOT_HANDLE;

    /* check the height */
    current_value = LE_32(&header[4]);
    if ((current_value == 0) || (current_value > 1024))
      return DEMUX_CANNOT_HANDLE;

    /* check the audio sample rate */
    current_value = LE_32(&header[8]);
    if ((current_value < 8000) || (current_value > 48000))
      return DEMUX_CANNOT_HANDLE;

    /* check the audio bytes/sample */
    current_value = LE_32(&header[12]);
    if (current_value > 2)
      return DEMUX_CANNOT_HANDLE;

    /* check the audio channels */
    current_value = LE_32(&header[16]);
    if (current_value > 2)
      return DEMUX_CANNOT_HANDLE;

    /* if execution got this far, qualify it as a valid Id CIN file */
    return DEMUX_CAN_HANDLE;
  }
  break;

  case STAGE_BY_EXTENSION: {
    char *suffix;
    char *MRL;
    char *m, *valid_ends;

    MRL = input->get_mrl (input);

    suffix = strrchr(MRL, '.');

    if(!suffix)
      return DEMUX_CANNOT_HANDLE;

    xine_strdupa(valid_ends, (this->config->register_string(this->config,
                                                            "mrl.ends_idcin", VALID_ENDS,
                                                            _("valid mrls ending for idcin demuxer"),
                                                            NULL, NULL, NULL)));    while((m = xine_strsep(&valid_ends, ",")) != NULL) {

      while(*m == ' ' || *m == '\t') m++;

      if(!strcasecmp((suffix + 1), m)) {
        this->input = input;
        return DEMUX_CAN_HANDLE;
      }
    }
    return DEMUX_CANNOT_HANDLE;
  }
  break;

  default:
    return DEMUX_CANNOT_HANDLE;
    break;
  }

  return DEMUX_CANNOT_HANDLE;
}

static int demux_idcin_start (demux_plugin_t *this_gen,
                              fifo_buffer_t *video_fifo,
                              fifo_buffer_t *audio_fifo,
                              off_t start_pos, int start_time) {

  demux_idcin_t *this = (demux_idcin_t *) this_gen;
  buf_element_t *buf;
  int err;
  char header[IDCIN_HEADER_SIZE];

  pthread_mutex_lock(&this->mutex);

  /* if thread is not running, initialize demuxer */
  if (!this->thread_running) {
    this->video_fifo = video_fifo;
    this->audio_fifo = audio_fifo;

    this->input->seek(this->input, 0, SEEK_SET);
    if (this->input->read(this->input, header, IDCIN_HEADER_SIZE) !=
      IDCIN_HEADER_SIZE) {
      this->status = DEMUX_FINISHED;
      pthread_mutex_unlock(&this->mutex);
      return DEMUX_FINISHED;
    }

    this->video_width = LE_32(&header[0]);
    this->video_height = LE_32(&header[4]);
    this->audio_sample_rate = LE_32(&header[8]);
    this->audio_bytes_per_sample = LE_32(&header[12]);
    this->audio_channels = LE_32(&header[16]);
    this->filesize = this->input->get_length(this->input);

    /* read the Huffman table */
    if (this->input->read(this->input, this->huffman_table,
      HUFFMAN_TABLE_SIZE) != HUFFMAN_TABLE_SIZE) {
      this->status = DEMUX_FINISHED;
      pthread_mutex_unlock(&this->mutex);
      return DEMUX_FINISHED;
    }

    /* print vital stats */
    xine_log (this->xine, XINE_LOG_FORMAT,
      _("demux_idcin: Id CIN file, video is %dx%d, 14 frames/sec\n"),
      this->video_width,
      this->video_height);
    if (this->audio_channels)
      xine_log (this->xine, XINE_LOG_FORMAT,
        _("demux_idcin: %d-bit, %d Hz %s PCM audio\n"),
        this->audio_bytes_per_sample * 8,
        this->audio_sample_rate,
        (this->audio_channels == 1) ? "monaural" : "stereo");

    /* send start buffers */
    xine_demux_control_start(this->xine);

    /* send new pts */
    xine_demux_control_newpts(this->xine, 0, 0);

    /* send init info to decoders */
    buf = this->video_fifo->buffer_pool_alloc (this->video_fifo);
    buf->decoder_flags = BUF_FLAG_HEADER;
    buf->decoder_info[0] = 0;
    buf->decoder_info[1] = IDCIN_FRAME_PTS_INC;  /* initial video_step */
    /* really be a rebel: No structure at all, just put the video width
     * and height straight into the buffer, BE_16 format */
    buf->content[0] = (this->video_width >> 8) & 0xFF;
    buf->content[1] = (this->video_width >> 0) & 0xFF;
    buf->content[2] = (this->video_height >> 8) & 0xFF;
    buf->content[3] = (this->video_height >> 0) & 0xFF;
    buf->size = 4;
    buf->type = BUF_VIDEO_IDCIN;
    this->video_fifo->put (this->video_fifo, buf);

    /* send the Huffman table */
    buf = this->video_fifo->buffer_pool_alloc (this->video_fifo);
    buf->decoder_flags = BUF_FLAG_SPECIAL;
    buf->decoder_info[1] = BUF_SPECIAL_IDCIN_HUFFMAN_TABLE;
    buf->decoder_info[2] = (unsigned int)&this->huffman_table;
    buf->size = 0;
    buf->type = BUF_VIDEO_IDCIN;
    this->video_fifo->put (this->video_fifo, buf);

    if (this->audio_fifo && this->audio_channels) {

      /* initialize the chunk sizes */
      if (this->audio_sample_rate % 14 != 0) {
        this->audio_chunk_size1 = (this->audio_sample_rate / 14) *
          this->audio_bytes_per_sample * this->audio_channels;
        this->audio_chunk_size2 = (this->audio_sample_rate / 14 + 1) *
          this->audio_bytes_per_sample * this->audio_channels;
      } else {
        this->audio_chunk_size1 = this->audio_chunk_size2 =
          (this->audio_sample_rate / 14) * this->audio_bytes_per_sample *
          this->audio_channels;
      }

      buf = this->audio_fifo->buffer_pool_alloc (this->audio_fifo);
      buf->type = BUF_AUDIO_LPCM_LE;
      buf->decoder_flags = BUF_FLAG_HEADER;
      buf->decoder_info[0] = 0;
      buf->decoder_info[1] = this->audio_sample_rate;
      buf->decoder_info[2] = this->audio_bytes_per_sample * 8;
      buf->decoder_info[3] = this->audio_channels;
      this->audio_fifo->put (this->audio_fifo, buf);
    }

    this->status = DEMUX_OK;
    this->send_end_buffers = 1;
    this->thread_running = 1;

    if ((err = pthread_create (&this->thread, NULL, demux_idcin_loop, this)) != 0) {
      printf ("demux_idcin: can't create new thread (%s)\n", strerror(err));
      abort();
    }

    this->status = DEMUX_OK;
  }

  pthread_mutex_unlock(&this->mutex);

  return DEMUX_OK;
}

static int demux_idcin_seek (demux_plugin_t *this_gen,
                             off_t start_pos, int start_time) {

  /* Id CIN files are not meant to be seekable; don't even bother */

  return 0;
}

static void demux_idcin_stop (demux_plugin_t *this_gen) {

  demux_idcin_t *this = (demux_idcin_t *) this_gen;
  void *p;

  pthread_mutex_lock( &this->mutex );

  if (!this->thread_running) {
    pthread_mutex_unlock( &this->mutex );
    return;
  }

  /* seek to the start of the data in case there's another start command */
  this->input->seek(this->input, IDCIN_HEADER_SIZE + HUFFMAN_TABLE_SIZE,
    SEEK_SET);

  this->send_end_buffers = 0;
  this->status = DEMUX_FINISHED;

  pthread_mutex_unlock( &this->mutex );
  pthread_join (this->thread, &p);

  xine_demux_flush_engine(this->xine);

  xine_demux_control_end(this->xine, BUF_FLAG_END_USER);
}

static void demux_idcin_close (demux_plugin_t *this) {
  free(this);
}

static int demux_idcin_get_status (demux_plugin_t *this_gen) {
  demux_idcin_t *this = (demux_idcin_t *) this_gen;

  return this->status;
}

static char *demux_idcin_get_id(void) {
  return "Id CIN";
}

static int demux_idcin_get_stream_length (demux_plugin_t *this_gen) {

  return 0;
}

static char *demux_idcin_get_mimetypes(void) {
  return NULL;
}

demux_plugin_t *init_demuxer_plugin(int iface, xine_t *xine) {
  demux_idcin_t *this;

  if (iface != 10) {
    printf (_("demux_idcin: plugin doesn't support plugin API version %d.\n"
              "             this means there's a version mismatch between xine and this "
              "             demuxer plugin.\nInstalling current demux plugins should help.\n"),
            iface);
    return NULL;
  }

  this         = (demux_idcin_t *) xine_xmalloc(sizeof(demux_idcin_t));
  this->config = xine->config;
  this->xine   = xine;

  (void *) this->config->register_string(this->config,
                                         "mrl.ends_idcin", VALID_ENDS,
                                         _("valid mrls ending for idcin demuxer"),                                         NULL, NULL, NULL);

  this->demux_plugin.interface_version = DEMUXER_PLUGIN_IFACE_VERSION;
  this->demux_plugin.open              = demux_idcin_open;
  this->demux_plugin.start             = demux_idcin_start;
  this->demux_plugin.seek              = demux_idcin_seek;
  this->demux_plugin.stop              = demux_idcin_stop;
  this->demux_plugin.close             = demux_idcin_close;
  this->demux_plugin.get_status        = demux_idcin_get_status;
  this->demux_plugin.get_identifier    = demux_idcin_get_id;
  this->demux_plugin.get_stream_length = demux_idcin_get_stream_length;
  this->demux_plugin.get_mimetypes     = demux_idcin_get_mimetypes;

  this->status = DEMUX_FINISHED;
  pthread_mutex_init(&this->mutex, NULL);

  return &this->demux_plugin;
}