libmp4.c

aac解码器源程序在Visual C++下的实现

/*
 * MP4/AAC decoder for xmms
 *
 * OPTIONNAL need
 * --------------
 * libid3 (3.8.x - www.id3.org)
*/

#include <pthread.h>
#include <gtk/gtk.h>
#include <stdio.h>
#include <string.h>

#if defined(HAVE_BMP)
#include <bmp/plugin.h>
#include <bmp/util.h>
#include <bmp/configfile.h>
#include <bmp/titlestring.h>
#else
#include <xmms/plugin.h>
#include <xmms/util.h>
#include <xmms/configfile.h>
#include <xmms/titlestring.h>
#endif /*HAVE_BMP*/

#include "neaacdec.h"
#include "mp4ff.h"

#define MP4_DESCRIPTION	"MP4 & MPEG2/4-AAC audio player - 1.2.x"
#define MP4_VERSION	"ver. 0.5-faad2-version - 22 August 2004"
#define MP4_ABOUT	"Written by ciberfred"
#define BUFFER_SIZE	FAAD_MIN_STREAMSIZE*64

static void	mp4_init(void);
static void	mp4_about(void);
static void	mp4_play(char *);
static void	mp4_stop(void);
static void	mp4_pause(short);
static void	mp4_seek(int);
static int	mp4_getTime(void);
static void	mp4_cleanup(void);
static void	mp4_getSongTitle(char *, char **, int *);
static void	mp4_getSongInfo(char *);
static int	mp4_isFile(char *);
static void*	mp4Decode(void *);

InputPlugin mp4_ip =
  {
    0,	// handle
    0,	// filename
    MP4_DESCRIPTION,
    mp4_init,
    mp4_about,
    0,	// configuration
    mp4_isFile,
    0,	//scandir
    mp4_play,
    mp4_stop,
    mp4_pause,
    mp4_seek,
    0,	// set equalizer
    mp4_getTime,
    0,	// get volume
    0,
    mp4_cleanup,
    0,	// obsolete
    0,	// send visualisation data
    0,	// set player window info
    0,	// set song title text
    mp4_getSongTitle,	// get song title text
    mp4_getSongInfo, // info box
    0,	// to output plugin
  };

typedef struct  _mp4cfg{
  gshort        file_type;
#define FILE_UNKNOW     0
#define FILE_MP4        1
#define FILE_AAC        2
}               Mp4Config;

static Mp4Config	mp4cfg;
static gboolean		bPlaying = FALSE;
static pthread_t	decodeThread;
static pthread_mutex_t	mutex = PTHREAD_MUTEX_INITIALIZER;
static int		seekPosition = -1;

// Functions from mp4_utils.c
extern int getAACTrack(mp4ff_t *infile);
extern mp4ff_callback_t *getMP4FF_cb(FILE *mp4file);
extern char *getMP4title(mp4ff_t *infile, char *filename);
extern void getMP4info(char* filename, FILE *mp4file);

InputPlugin *get_iplugin_info(void)
{
  return(&mp4_ip);
}

static void mp4_init(void)
{
  memset(&decodeThread, 0, sizeof(pthread_t));
  mp4cfg.file_type = FILE_UNKNOW;
  seekPosition = -1;
  return;
}

static void mp4_play(char *filename)
{
  bPlaying = TRUE;
  pthread_create(&decodeThread, 0, mp4Decode, g_strdup(filename));
  return;
}

static void mp4_stop(void)
{
  if(bPlaying){
    bPlaying = FALSE;
    pthread_join(decodeThread, NULL);
    memset(&decodeThread, 0, sizeof(pthread_t));
    mp4_ip.output->close_audio();
  }
}

static int	mp4_isFile(char *filename)
{
  if(filename){
    gchar*	extention;

    extention = strrchr(filename, '.');
    if(extention &&
       (!strncasecmp(extention, ".mp4", 4) ||	// official extention
	!strncasecmp(extention, ".m4a", 4) ||	// Apple mp4 extention
	!strncasecmp(extention, ".aac", 4)	// old MPEG2/4-AAC extention
	)){
      return (1);
    }
  }
  return(0);
}

static void	mp4_about(void)
{
  static GtkWidget *aboutbox;

  if(aboutbox!=NULL)
    return;
  aboutbox = xmms_show_message("About MP4 AAC player plugin",
			       "libfaad2-" FAAD2_VERSION "\n"
			       "plugin version: " MP4_VERSION "\n"
			       MP4_ABOUT,
			       "Ok", FALSE, NULL, NULL);
  gtk_signal_connect(GTK_OBJECT(aboutbox), "destroy",
                     GTK_SIGNAL_FUNC(gtk_widget_destroyed),
                     &aboutbox);
}

static void	mp4_pause(short flag)
{
  mp4_ip.output->pause(flag);
}

static void	mp4_seek(int time)
{
  seekPosition = time;
  while(bPlaying && seekPosition!=-1)
    xmms_usleep(10000);
}

static int	mp4_getTime(void)
{
  if(!bPlaying)
    return (-1);
  else
    return (mp4_ip.output->output_time());
}

static void	mp4_cleanup(void)
{
}

void mp4_get_file_type(FILE *mp4file)
{
  unsigned char header[10] = {0};

  fseek(mp4file, 0, SEEK_SET);
  fread(header, 1, 8, mp4file);
  if(header[4]=='f' &&
     header[5]=='t' &&
     header[6]=='y' &&
     header[7]=='p'){
    mp4cfg.file_type = FILE_MP4;
  }else{
    mp4cfg.file_type = FILE_AAC;
  }
}

static void	mp4_getSongTitle(char *filename, char **title, int *len) {
  FILE* mp4file;

  (*title) = NULL;
  (*len) = -1;

  if((mp4file = fopen(filename, "rb"))){
    mp4_get_file_type(mp4file);
    fseek(mp4file, 0, SEEK_SET);
    if(mp4cfg.file_type == FILE_MP4){
      mp4ff_callback_t*	mp4cb;
      mp4ff_t*		infile;
      gint		mp4track;

      mp4cb = getMP4FF_cb(mp4file);
      if ((infile = mp4ff_open_read_metaonly(mp4cb)) &&
          ((mp4track = getAACTrack(infile)) >= 0)){
        (*title) = getMP4title(infile, filename);

        double track_duration = mp4ff_get_track_duration(infile, mp4track);
        unsigned long time_scale = mp4ff_time_scale(infile, mp4track);
        unsigned long length = (track_duration * 1000 / time_scale);
        (*len) = length;
      }
      if(infile) mp4ff_close(infile);
      if(mp4cb) g_free(mp4cb);
    }
    else{
      // Check AAC ID3 tag...
    }
    fclose(mp4file);
  }
}

static void	mp4_getSongInfo(char *filename)
{
  FILE* mp4file;
  if((mp4file = fopen(filename, "rb"))){
    if (mp4cfg.file_type == FILE_UNKNOW)
      mp4_get_file_type(mp4file);
    fseek(mp4file, 0, SEEK_SET);
    if(mp4cfg.file_type == FILE_MP4)
      getMP4info(filename, mp4file);
    else if(mp4cfg.file_type == FILE_AAC)
      /*
       * check the id3tagv2
      */
      ;
    fclose(mp4file);
  }
}

static void *mp4Decode(void *args)
{
  FILE*		mp4file;

  pthread_mutex_lock(&mutex);
  seekPosition = -1;
  bPlaying = TRUE;

  if(!(mp4file = fopen(args, "rb"))){
    g_print("MP4!AAC - Can't open file\n");
    g_free(args);
    bPlaying = FALSE;
    pthread_mutex_unlock(&mutex);
    pthread_exit(NULL);

  }
  mp4_get_file_type(mp4file);
  fseek(mp4file, 0, SEEK_SET);
  if(mp4cfg.file_type == FILE_MP4){// We are reading a MP4 file
    mp4ff_callback_t*	mp4cb;
    mp4ff_t*		infile;
    gint		mp4track;

    mp4cb = getMP4FF_cb(mp4file);
    if(!(infile = mp4ff_open_read(mp4cb))){
      g_print("MP4 - Can't open file\n");
      goto end;
    }

    if((mp4track = getAACTrack(infile)) < 0){
      /*
       * TODO: check here for others Audio format.....
       *
      */
      g_print("Unsupported Audio track type\n");
      g_free(args);
      fclose(mp4file);
      bPlaying = FALSE;
      pthread_mutex_unlock(&mutex);
      pthread_exit(NULL);
    }else{
      NeAACDecHandle	decoder;
      unsigned char	*buffer	= NULL;
      guint		bufferSize = 0;
      gulong		samplerate;
      guchar		channels;