/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/*
 * RTVideoRec Realtime video recoder and encoder for Linux
 *
 * Copyright (C) 2004  Bent Bisballe
 * Copyright (C) 2004  B. Stultiens
 * Copyright (C) 2004  Koen Otter and Glenn van der Meyden
 *
 * This program 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.
 *
 * This program 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
 */
#include <config.h>

#include "decoder.h"

Decoder::Decoder(char *device, 
                 int channel, 
                 sem_t *gencode_sem,
                 sem_t *gplayer_sem,
                 Queue<DVFrame> *gencode_queue,
                 Queue<FFFrame> *gplayer_queue,
                 pthread_mutex_t *gmutex,
                 volatile int *grunning)
{
  encode_sem = gencode_sem;
  player_sem = gplayer_sem;
  encode_queue = gencode_queue;
  player_queue = gplayer_queue;
  mutex = gmutex;
  running = grunning;

  AVFormatContext *ifc;
  AVFormatParameters dvpars;
  AVInputFormat *iformat;
  AVCodec *dec_codec;
  
  memset(&dvpars, 0, sizeof(dvpars));
  
  if(!(iformat = av_find_input_format("dv1394"))) {
    fprintf(stderr, "Failed to get input format dv1394\n");
    exit(1);
  }
  
  dvpars.device  = device;	/* "/dev/dv1394"; */
  dvpars.channel = channel;
  dvpars.standard = "pal";
  
  if(av_open_input_file(&ifc, "", iformat, 0, &dvpars) < 0) {
    fprintf(stderr, "Device is in use\n");
    fc = NULL; return;
  }
  if(av_find_stream_info(ifc) < 0) {
    fprintf (stderr, "Could not find enough parameters\n");
    fc = NULL; return;
  }

  dump_format(ifc, 1, "", 0);
	
  if(!(dec_codec = avcodec_find_decoder(ifc->streams[0]->codec.codec_id))) {
    printf("Unsupported codec for input stream \n");
    fc = NULL; return;
  }

  if(avcodec_open(&ifc->streams[0]->codec, dec_codec) < 0) {
    printf("Error while opening codec for input stream\n");
    fc = NULL; return;
  }

  fc = ifc;
}

Decoder::~Decoder()
{
  avcodec_close(&fc->streams[0]->codec);
  av_close_input_file(fc);
}

void Decoder::decode()
{
  if(fc == NULL) {
    printf("Decoder not initialized.\n");
    return;
  }

  while(*running) {
    AVPacket pkt;
    uint8_t *ptr;
    int len;
    SDL_Event user_event;
    
    av_read_packet(fc, &pkt);
    len = pkt.size;
    ptr = pkt.data;
    /* NOTE: we only decode video, we only need the data from stream_index 0 */
    /* (stream 0: video, stream 1: audio) */

    while(pkt.stream_index == 0 && len > 0) {
      int ret;
      int got_picture;
      //      buf_t *buf = buf_alloc();
      FFFrame *fff = new FFFrame();
      DVFrame *dvf = new DVFrame();
      dvf->type = DVF_VIDEO;
      
      memcpy(dvf->frame, ptr, len);

      //      fprintf(stderr, "DVBufferSize: [%d]bytes\n", len);
      ret = avcodec_decode_video(&fc->streams[0]->codec, 
				 fff->frame, &got_picture, ptr, len);
      
      if(ret < 0) {
        fprintf(stderr, "Error while decoding stream\n");
        exit(1);
      }

      len -= ret;
      ptr += ret;
      
      pthread_mutex_lock(mutex);
      encode_queue->push(dvf);
      player_queue->push(fff);
      pthread_mutex_unlock(mutex);
      
      sem_post(encode_sem);
      
      user_event.type = SDL_USEREVENT;
      user_event.user.code = 0;
      user_event.user.data1 = NULL;
      user_event.user.data2 = NULL;
      SDL_PushEvent(&user_event);
    }

    /* // For later use, when audio must be implemented
    while(pkt.stream_index == 1 && len > 0) {
      DVFrame *dvf = new DVFrame();
      dvf->type = DVF_AUDIO;

      memcpy(dvf->frame, ptr, sizeof(dvf->frame));

      ptr += sizeof(dvf->frame);
      len -= sizeof(dvf->frame);

      pthread_mutex_lock(mutex);
      encode_queue->push(dvf);
      pthread_mutex_unlock(mutex);
      
      sem_post(encode_sem);
    }
    */
    av_free_packet(&pkt);
  }

  /* Kick the others so they wake up with empty queues */
  sem_post(encode_sem);
  pthread_exit(NULL);
}

void Decoder::run() {
  decode();
}