/*
 * 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
 *
 * Real Media File Demuxer by Mike Melanson (melanson@pcisys.net)
 * For more information regarding the Real file format, visit:
 *   http://www.pcisys.net/~melanson/codecs/
 *
 * $Id: demux_real.c,v 1.8 2002/11/09 23:22:32 guenter Exp $
 */

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

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

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

#define FOURCC_TAG( ch0, ch1, ch2, ch3 ) \
        ( (long)(unsigned char)(ch3) | \
        ( (long)(unsigned char)(ch2) << 8 ) | \
        ( (long)(unsigned char)(ch1) << 16 ) | \
        ( (long)(unsigned char)(ch0) << 24 ) )

#define RMF_TAG   FOURCC_TAG('.', 'R', 'M', 'F')
#define PROP_TAG  FOURCC_TAG('P', 'R', 'O', 'P')
#define MDPR_TAG  FOURCC_TAG('M', 'D', 'P', 'R')
#define CONT_TAG  FOURCC_TAG('C', 'O', 'N', 'T')
#define DATA_TAG  FOURCC_TAG('D', 'A', 'T', 'A')
#define INDX_TAG  FOURCC_TAG('I', 'N', 'D', 'X')

#define PREAMBLE_SIZE 8
#define REAL_SIGNATURE_SIZE 4
#define DATA_CHUNK_HEADER_SIZE 10
#define DATA_PACKET_HEADER_SIZE 12

#define PN_KEYFRAME_FLAG 0x0002

typedef struct {
  int stream;
  int64_t offset;
  unsigned int size;
  int64_t pts;
  int keyframe;
} real_packet;

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;

  off_t                data_start;
  off_t                data_size;
  int                  status;
  unsigned int         duration;

  unsigned int         video_type;
  unsigned int         audio_type;

  unsigned int         video_width;
  unsigned int         video_height;
  unsigned int         audio_channels;
  unsigned int         audio_sample_rate;
  unsigned int         audio_bits;

  unsigned int         packet_count;
  unsigned int         current_packet;
  real_packet         *packets;

  unsigned int         current_data_chunk_packet_count;
  unsigned int         next_data_chunk_offset;

  char                 last_mrl[1024];
} demux_real_t ;

typedef struct {

  demux_class_t     demux_class;

  /* class-wide, global variables here */

  xine_t           *xine;
  config_values_t  *config;
} demux_real_class_t;

/* returns 1 if the real file was opened successfully, 0 otherwise */
static int open_real_file(demux_real_t *this) {

  char preamble[PREAMBLE_SIZE];
  unsigned int chunk_type = 0;
  unsigned int chunk_size;
  unsigned char *chunk_buffer;
  int field_size;
  int stream_ptr;
  unsigned char data_chunk_header[DATA_CHUNK_HEADER_SIZE];
  unsigned char signature[REAL_SIGNATURE_SIZE];

  this->data_start = 0;
  this->data_size = 0;
  this->packets = NULL;
  this->current_packet = 0;

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

  if (BE_32(signature) != RMF_TAG)
    return 0;

  /* skip to the start of the first chunk (the first chunk is 0x12 bytes
   * long) and start traversing */
  this->input->seek(this->input, 0x12, SEEK_SET);

  /* iterate through chunks and gather information until the first DATA
   * chunk is located */
  while (chunk_type != DATA_TAG) {

    if (this->input->read(this->input, preamble, PREAMBLE_SIZE) != 
      PREAMBLE_SIZE)
      return 0;
    chunk_type = BE_32(&preamble[0]);
    chunk_size = BE_32(&preamble[4]);

    switch (chunk_type) {

    case PROP_TAG:
    case MDPR_TAG:
    case CONT_TAG:

      chunk_size -= PREAMBLE_SIZE;
      chunk_buffer = xine_xmalloc(chunk_size);
      if (this->input->read(this->input, chunk_buffer, chunk_size) != 
        chunk_size) {
        free(chunk_buffer);
        return 0;
      }

      if (chunk_type == PROP_TAG) {

        this->packet_count = BE_32(&chunk_buffer[18]);
        this->duration = BE_32(&chunk_buffer[22]);
        this->data_start = BE_32(&chunk_buffer[34]);

      } else if (chunk_type == MDPR_TAG) {


      } else if (chunk_type == CONT_TAG) {

        stream_ptr = 2;

        /* load the title string */
        field_size = BE_16(&chunk_buffer[stream_ptr]);
        stream_ptr += 2;
        this->stream->meta_info[XINE_META_INFO_TITLE] =
          xine_xmalloc(field_size + 1);
        strncpy(this->stream->meta_info[XINE_META_INFO_TITLE],
          &chunk_buffer[stream_ptr], field_size);
        this->stream->meta_info[XINE_META_INFO_TITLE][field_size] = '\0';
        stream_ptr += field_size;

        /* load the author string */
        field_size = BE_16(&chunk_buffer[stream_ptr]);
        stream_ptr += 2;
        this->stream->meta_info[XINE_META_INFO_ARTIST] =
          xine_xmalloc(field_size + 1);
        strncpy(this->stream->meta_info[XINE_META_INFO_ARTIST],
          &chunk_buffer[stream_ptr], field_size);
        this->stream->meta_info[XINE_META_INFO_ARTIST][field_size] = '\0';
        stream_ptr += field_size;

        /* load the copyright string as the year */
        field_size = BE_16(&chunk_buffer[stream_ptr]);
        stream_ptr += 2;
        this->stream->meta_info[XINE_META_INFO_YEAR] =
          xine_xmalloc(field_size + 1);
        strncpy(this->stream->meta_info[XINE_META_INFO_YEAR],
          &chunk_buffer[stream_ptr], field_size);
        this->stream->meta_info[XINE_META_INFO_YEAR][field_size] = '\0';
        stream_ptr += field_size;

        /* load the comment string */
        field_size = BE_16(&chunk_buffer[stream_ptr]);
        stream_ptr += 2;
        this->stream->meta_info[XINE_META_INFO_COMMENT] =
          xine_xmalloc(field_size + 1);
        strncpy(this->stream->meta_info[XINE_META_INFO_COMMENT],
          &chunk_buffer[stream_ptr], field_size);
        this->stream->meta_info[XINE_META_INFO_COMMENT][field_size] = '\0';
        stream_ptr += field_size;
      }

      free(chunk_buffer);
      break;

    case DATA_TAG:
      if (this->input->read(this->input, data_chunk_header, 
        DATA_CHUNK_HEADER_SIZE) != DATA_CHUNK_HEADER_SIZE)
        return 0;
      this->current_data_chunk_packet_count = BE_32(&data_chunk_header[2]);
      this->next_data_chunk_offset = BE_32(&data_chunk_header[6]);
      break;

    default:
      /* this should not occur, but in case it does, skip the chunk */
      this->input->seek(this->input, chunk_size - PREAMBLE_SIZE, SEEK_CUR);
      break;

    }
  }

  /* allocate space for the packet list */
  this->packets = xine_xmalloc(this->packet_count * sizeof(real_packet));

  return 1;
}

static int demux_real_send_chunk(demux_plugin_t *this_gen) {

  demux_real_t *this = (demux_real_t *) this_gen;
  buf_element_t *buf = NULL;
  char preamble[PREAMBLE_SIZE];
  unsigned char data_chunk_header[DATA_CHUNK_HEADER_SIZE];
  char header[DATA_PACKET_HEADER_SIZE];

  /* load a header from wherever the stream happens to be pointing */
  if (this->input->read(this->input, header, DATA_PACKET_HEADER_SIZE) !=
    DATA_PACKET_HEADER_SIZE) {
    this->status = DEMUX_FINISHED;
    return this->status;
  }

  /* log the packet information */
  this->packets[this->current_packet].stream = BE_16(&header[4]);
  this->packets[this->current_packet].offset = 
    this->input->get_current_pos(this->input);
  this->packets[this->current_packet].size = 
    BE_16(&header[2]) - DATA_PACKET_HEADER_SIZE;
  this->packets[this->current_packet].pts = 
    BE_32(&header[6]);
  this->packets[this->current_packet].pts *= 90;
  this->packets[this->current_packet].keyframe =
    (header[11] & PN_KEYFRAME_FLAG);

printf ("packet %d: stream %d, 0x%X bytes @ %llX, pts = %lld%s\n",
this->current_packet,
this->packets[this->current_packet].stream,
this->packets[this->current_packet].size,
this->packets[this->current_packet].offset,
this->packets[this->current_packet].pts,
(this->packets[this->current_packet].keyframe) ? ", keyframe" : "");



this->input->seek(this->input, this->packets[this->current_packet].size,
SEEK_CUR);

  this->current_packet++;
  this->current_data_chunk_packet_count--;

  /* check if it's time to reload */
  if (!this->current_data_chunk_packet_count && 
    this->next_data_chunk_offset) {

    /* seek to the next DATA chunk offset */
    this->input->seek(this->input, this->next_data_chunk_offset, SEEK_SET);

    /* load the DATA chunk preamble */
    if (this->input->read(this->input, preamble, PREAMBLE_SIZE) !=
      PREAMBLE_SIZE) {
      this->status = DEMUX_FINISHED;
      return this->status;
    }

    /* load the rest of the DATA chunk header */
    if (this->input->read(this->input, data_chunk_header, 
      DATA_CHUNK_HEADER_SIZE) != DATA_CHUNK_HEADER_SIZE) {
      this->status = DEMUX_FINISHED;
      return this->status;
    }
printf ("**** found next DATA tag\n");
    this->current_data_chunk_packet_count = BE_32(&data_chunk_header[2]);
    this->next_data_chunk_offset = BE_32(&data_chunk_header[6]);
  }

  if (!this->current_data_chunk_packet_count) {
    this->status = DEMUX_FINISHED;
    return this->status;
  }
  return this->status;
}

static void demux_real_send_headers(demux_plugin_t *this_gen) {

  demux_real_t *this = (demux_real_t *) this_gen;
  buf_element_t *buf;

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

  this->status = DEMUX_OK;

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

  /* send init info to decoders */


  xine_demux_control_headers_done (this->stream);
}

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

  demux_real_t *this = (demux_real_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;
  }

  return this->status;
}

static void demux_real_dispose (demux_plugin_t *this_gen) {

  demux_real_t *this = (demux_real_t *) this_gen;

  free(this->packets);
  free(this);
}

static int demux_real_get_status (demux_plugin_t *this_gen) {
  demux_real_t *this = (demux_real_t *) this_gen;

  return this->status;
}

static int demux_real_get_stream_length (demux_plugin_t *this_gen) {

  demux_real_t *this = (demux_real_t *) this_gen;

  /* duration is stored in the file as milliseconds */
  return this->duration / 1000;
}

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_real_t   *this;

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

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

  this->demux_plugin.send_headers      = demux_real_send_headers;
  this->demux_plugin.send_chunk        = demux_real_send_chunk;
  this->demux_plugin.seek              = demux_real_seek;
  this->demux_plugin.dispose           = demux_real_dispose;
  this->demux_plugin.get_status        = demux_real_get_status;
  this->demux_plugin.get_stream_length = demux_real_get_stream_length;
  this->demux_plugin.get_video_frame   = NULL;
  this->demux_plugin.got_video_frame_cb= NULL;
  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_real_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, ".rm", 3)) {
      free (this);
      return NULL;
    }

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

  }

  break;

  default:
    free (this);
    return NULL;
  }

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

  /* print vital stats */
  xine_log (this->stream->xine, XINE_LOG_MSG,
    _("demux_real: Real media file, running time: %d min, %d sec\n"),
    this->duration / 1000 / 60,
    this->duration / 1000 % 60);

  return &this->demux_plugin;
}

static char *get_description (demux_class_t *this_gen) {
  return "RealMedia file demux plugin";
}

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

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

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

static void class_dispose (demux_class_t *this_gen) {

  demux_real_class_t *this = (demux_real_class_t *) this_gen;

  free (this);
}

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

  demux_real_class_t     *this;

  this         = xine_xmalloc (sizeof (demux_real_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, 16, "real", XINE_VERSION_CODE, NULL, init_plugin },
  { PLUGIN_NONE, 0, "", 0, NULL, NULL }
};