Initial revision

1 files changed, 171 insertions, 0 deletions

diff --git a/src/decoder.cc b/src/decoder.cc
new file mode 100644
index 0000000..2171b1a
--- /dev/null
+++ b/src/decoder.cc
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+/* -*- 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();
+}