/*
 * Copyright (C) 2000-2002 the xine project
 *
 * This file is part of xine, a free 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
 *
 * TechnoTrend PVA File Demuxer by Mike Melanson (melanson@pcisys.net)
 * For more information regarding the PVA file format, refer to this PDF:
 *   http://www.technotrend.de/download/av_format_v1.pdf
 *
 * $Id: demux_pva.c,v 1.2 2003/01/04 14:48:12 miguelfreitas 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 PVA_PREAMBLE_SIZE 8

typedef struct {

  demux_plugin_t       demux_plugin;

  xine_stream_t       *stream;

  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                data_start;
  off_t                data_size;
  int                  status;

  char                 last_mrl[1024];

} demux_pva_t;

typedef struct {

  demux_class_t     demux_class;

  /* class-wide, global variables here */

  xine_t           *xine;
  config_values_t  *config;
} demux_pva_class_t;


/* returns 1 if the PVA file was opened successfully, 0 otherwise */
static int open_pva_file(demux_pva_t *this) {

  unsigned char preamble[PVA_PREAMBLE_SIZE];

  this->input->seek(this->input, 0, SEEK_SET);
  if (this->input->read(this->input, preamble, PVA_PREAMBLE_SIZE) !=
    PVA_PREAMBLE_SIZE)
    return 0;

  /* PVA file must start with signature "AV" */
  if ((preamble[0] != 'A') || (preamble[1] != 'V'))
    return 0;

  /* enforce the rule that stream ID must be either 1 or 2 */
  if ((preamble[2] != 1) && (preamble[2] != 2))
    return 0;

  /* counter on the first packet should be 0 */
  if (preamble[3] != 0)
    return 0;

  this->data_size = this->input->get_length(this->input);

  return 1;
}

static int demux_pva_send_chunk(demux_plugin_t *this_gen) {

  demux_pva_t *this = (demux_pva_t *) this_gen;
  buf_element_t *buf;
  int chunk_size;
  unsigned char preamble[PVA_PREAMBLE_SIZE];
  unsigned char pts_buf[4];
  off_t current_file_pos;

  if (this->input->read(this->input, preamble, PVA_PREAMBLE_SIZE) !=
    PVA_PREAMBLE_SIZE)
    return 0;

  /* make sure the signature is there */
  if ((preamble[0] != 'A') || (preamble[1] != 'V')) {
    this->status = DEMUX_FINISHED;
    return this->status;
  }

  chunk_size = BE_16(&preamble[6]);

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

  if (preamble[2] == 1) {

    /* video */
    buf = this->video_fifo->buffer_pool_alloc(this->video_fifo);

    /* load the pts if it is the first thing in the chunk */
    if (preamble[5] & 0x10) {
      if (this->input->read(this->input, pts_buf, 4) != 4) {
        buf->free_buffer(buf);
        this->status = DEMUX_FINISHED;
        return this->status;
      }
      chunk_size -= 4;
      buf->pts = BE_32(&pts_buf[0]);
    } else
      buf->pts = 0;

    while (chunk_size) {
      buf = this->video_fifo->buffer_pool_alloc (this->video_fifo);
      buf->type = BUF_VIDEO_MPEG;
      buf->extra_info->input_pos = current_file_pos;
      buf->extra_info->input_length = this->data_size;
      buf->extra_info->input_time = buf->pts / 90000;

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

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

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

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

  } else if (preamble[2] == 2) {

    /* audio */

    /* skip for the time being */
    this->input->seek(this->input, chunk_size, SEEK_CUR);

  } else {

    /* unknown, skip it */
    this->input->seek(this->input, chunk_size, SEEK_CUR);

  }

  return this->status;
}

static void demux_pva_send_headers(demux_plugin_t *this_gen) {

  demux_pva_t *this = (demux_pva_t *) this_gen;
  buf_element_t *buf;
  int n;

  this->video_fifo = this->stream->video_fifo;
  this->audio_fifo = this->stream->audio_fifo;

  this->status = DEMUX_OK;

  /* load stream information */
  this->stream->stream_info[XINE_STREAM_INFO_HAS_VIDEO] = 1;
/*  this->stream->stream_info[XINE_STREAM_INFO_HAS_AUDIO] = 1; */
  this->stream->stream_info[XINE_STREAM_INFO_HAS_AUDIO] = 0;

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

  /* send init info to video decoder (cribbed from demux_elem.c) */
  buf = this->video_fifo->buffer_pool_alloc(this->video_fifo);
  buf->content = buf->mem;
  buf->type = BUF_DEMUX_BLOCK;

  n = this->input->read (this->input, buf->mem, 2048);

  if (n<=0) {
    buf->free_buffer (buf);
    this->status = DEMUX_FINISHED;
    return;
  }

  buf->size = n;

  buf->pts             = 0;
  buf->extra_info->input_pos       = this->input->get_current_pos(this->input);
  buf->type            = BUF_VIDEO_MPEG;

  buf->decoder_flags = BUF_FLAG_PREVIEW;

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

  /* send init info to the audio decoder */
  if (this->audio_fifo) {

    /* figure out the situation with PES audio */

  }


}

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

  demux_pva_t *this = (demux_pva_t *) this_gen;

  /* if thread is not running, initialize demuxer */
  if( !this->stream->demux_thread_running ) {

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

    this->status = DEMUX_OK;

    /* start at the very beginning of the file */
    this->input->seek(this->input, 0, SEEK_SET);
  }

  return this->status;
}

static void demux_pva_dispose (demux_plugin_t *this) {

  free(this);
}

static int demux_pva_get_status (demux_plugin_t *this_gen) {
  demux_pva_t *this = (demux_pva_t *) this_gen;

  return this->status;
}

static int demux_pva_get_stream_length (demux_plugin_t *this_gen) {

  return 0;
}

static uint32_t demux_pva_get_capabilities(demux_plugin_t *this_gen) {
  return DEMUX_CAP_NOCAP;
}

static int demux_pva_get_optional_data(demux_plugin_t *this_gen,
                                           void *data, int data_type) {
  return DEMUX_OPTIONAL_UNSUPPORTED;
}

static demux_plugin_t *open_plugin (demux_class_t *class_gen, xine_stream_t *stream,
                                    input_plugin_t *input_gen) {

  input_plugin_t *input = (input_plugin_t *) input_gen;
  demux_pva_t    *this;

  if (! (input->get_capabilities(input) & INPUT_CAP_SEEKABLE)) {
    printf(_("demux_pva.c: input not seekable, can not handle!\n"));
    return NULL;
  }

  this         = xine_xmalloc (sizeof (demux_pva_t));
  this->stream = stream;
  this->input  = input;

  this->demux_plugin.send_headers      = demux_pva_send_headers;
  this->demux_plugin.send_chunk        = demux_pva_send_chunk;
  this->demux_plugin.seek              = demux_pva_seek;
  this->demux_plugin.dispose           = demux_pva_dispose;
  this->demux_plugin.get_status        = demux_pva_get_status;
  this->demux_plugin.get_stream_length = demux_pva_get_stream_length;
  this->demux_plugin.get_video_frame   = NULL;
  this->demux_plugin.got_video_frame_cb= NULL;
  this->demux_plugin.get_capabilities  = demux_pva_get_capabilities;
  this->demux_plugin.get_optional_data = demux_pva_get_optional_data;
  this->demux_plugin.demux_class       = class_gen;

  this->status = DEMUX_FINISHED;

  switch (stream->content_detection_method) {

  case METHOD_BY_CONTENT:
  case METHOD_EXPLICIT:

    if (!open_pva_file(this)) {
      free (this);
      return NULL;
    }
  break;

  case METHOD_BY_EXTENSION: {
    char *ending, *mrl;

    mrl = input->get_mrl (input);

    ending = strrchr(mrl, '.');

    if (!ending) {
      free (this);
      return NULL;
    }

    if (strncasecmp (ending, ".pva", 4)) {
      free (this);
      return NULL;
    }

    if (!open_pva_file(this)) {
      free (this);
      return NULL;
    }

  }

  break;

  default:
    free (this);
    return NULL;
  }

  strncpy (this->last_mrl, input->get_mrl (input), 1024);

  return &this->demux_plugin;
}

static char *get_description (demux_class_t *this_gen) {
  return "TechnoTrend PVA demux plugin";
}

static char *get_identifier (demux_class_t *this_gen) {
  return "TechnoTrend PVA";
}

static char *get_extensions (demux_class_t *this_gen) {
  return "pva";
}

static char *get_mimetypes (demux_class_t *this_gen) {
  return NULL;
}

static void class_dispose (demux_class_t *this_gen) {

  demux_pva_class_t *this = (demux_pva_class_t *) this_gen;

  free (this);
}

static void *init_plugin (xine_t *xine, void *data) {

  demux_pva_class_t     *this;

  this         = xine_xmalloc (sizeof (demux_pva_class_t));
  this->config = xine->config;
  this->xine   = xine;

  this->demux_class.open_plugin     = open_plugin;
  this->demux_class.get_description = get_description;
  this->demux_class.get_identifier  = get_identifier;
  this->demux_class.get_mimetypes   = get_mimetypes;
  this->demux_class.get_extensions  = get_extensions;
  this->demux_class.dispose         = class_dispose;

  return this;
}

/*
 * exported plugin catalog entry
 */

plugin_info_t xine_plugin_info[] = {
  /* type, API, "name", version, special_info, init_function */
  { PLUGIN_DEMUX, 20, "pva", XINE_VERSION_CODE, NULL, init_plugin },
  { PLUGIN_NONE, 0, "", 0, NULL, NULL }
};