I wonder why logcat says "NO SUCH A FILE OR DIRECTORY(2)" - ffmpeg

Question

I wanna play audio on Android with ffmpeg.
But when I run this project, error has occurred
what should I do?
java SIDE
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import android.app.Activity;
import android.media.AudioFormat;
import android.media.AudioManager;
import android.media.AudioTrack;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.os.SystemClock;
public class FFmpegBasic extends Activity
{
private AudioTrack track;
private FileOutputStream os;
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
createEngine();
int bufSize = AudioTrack.getMinBufferSize(44100,
AudioFormat.CHANNEL_CONFIGURATION_STEREO,
AudioFormat.ENCODING_PCM_16BIT);
track = new AudioTrack(AudioManager.STREAM_MUSIC,
44100,
AudioFormat.CHANNEL_CONFIGURATION_STEREO,
AudioFormat.ENCODING_PCM_16BIT,
bufSize,
AudioTrack.MODE_STREAM);
byte[] bytes = new byte[bufSize];
try {
os = new FileOutputStream("/sdcard/a.out",false);
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
String result = "/mnt/sdcard/Wildlife.mp3";
loadFile(result,bytes);
try {
os.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
void playSound(byte[] buf, int size) {
if(track.getPlayState()!=AudioTrack.PLAYSTATE_PLAYING)
track.play();
track.write(buf, 0, size);
try {
os.write(buf,0,size);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
private native void createEngine();
private native void loadFile(String file, byte[] array);
/** Load jni .so on initialization*/
static {
System.loadLibrary("avutil");
System.loadLibrary("avcore");
System.loadLibrary("avcodec");
System.loadLibrary("avformat");
System.loadLibrary("avdevice");
System.loadLibrary("swscale");
System.loadLibrary("avfilter");
System.loadLibrary("ffmpeg");
System.loadLibrary("basicplayer");
}
}
c SIDE
#include <assert.h>
#include <jni.h>
#include <string.h>
#include <android/log.h>
#include "libavcodec/avcodec.h"
#include "libavformat/avformat.h"
#include "avcodec.h"
#include "avformat.h"
void Java_net_jbong_FFmpegBasic_FFmpegBasic_createEngine(JNIEnv* env, jclass clazz)
{
//avcodec_init();
av_register_all();
}
void Java_net_jbong_FFmpegBasic_FFmpegBasic_loadFile(JNIEnv* env, jobject obj, jstring file, jbyteArray array)
{
AVFormatContext *gFormatCtx = NULL;
AVCodecContext *gAudioCodecCtx = NULL;
AVCodec *gAudioCodec = NULL;
int gAudioStreamIdx = -1;
char *gAudioBuffer = NULL;
int i, outsize = 0;
AVPacket packet;
const char *str;
str = (*env)->GetStringUTFChars(env, file, NULL);
jclass cls = (*env)->GetObjectClass(env, obj);
jmethodID play = (*env)->GetMethodID(env, cls, "playSound", "([BI)V");
if (gFormatCtx != NULL)
return -1;
if (av_open_input_file(&gFormatCtx,str,NULL,0,NULL)!=0)
return -2;
if (av_find_stream_info(gFormatCtx) < 0)
return -3;
for(i=0; i<gFormatCtx->nb_streams; i++)
{
if(gFormatCtx->streams[i]->codec->codec_type == AVMEDIA_TYPE_AUDIO)
{
gAudioStreamIdx = i;
break;
}
}
if (gAudioStreamIdx == -1)
return -4;
gAudioCodecCtx = gFormatCtx->streams[gAudioStreamIdx]->codec;
gAudioCodec = avcodec_find_decoder(gAudioCodecCtx->codec_id);
if (gAudioCodec == NULL)
return -5;
if (avcodec_open(gAudioCodecCtx, gAudioCodec)<0)
return -6;
gAudioBuffer = (char *)av_malloc(AVCODEC_MAX_AUDIO_FRAME_SIZE *2);
int decode = 0;
while (av_read_frame(gFormatCtx, &packet) >= 0)
{
if (gFormatCtx-> streams[packet.stream_index]->codec->codec_type == AVMEDIA_TYPE_AUDIO)
{
int data_size = AVCODEC_MAX_AUDIO_FRAME_SIZE * 8;
gAudioBuffer = (char *)av_malloc(data_size);
int size=packet.size;
while(size > 0)
{
int len = avcodec_decode_audio3(gAudioCodecCtx,
(short *) gAudioBuffer, &data_size, &packet);
if (data_size > 0)
{
jbyte *bytes = (*env)->GetByteArrayElements(env, array, NULL);
memcpy(bytes + decode, (int16_t *)gAudioBuffer, size);
(*env)->ReleaseByteArrayElements(env, array, bytes, 0);
(*env)->CallVoidMethod(env, obj, play, array, data_size);
decode += size;
size -= len;
}
}
}
av_free_packet(&packet);
}
av_close_input_file(gFormatCtx);
return 0;
}
Why my android logcat show me this message ?
"error opening trace file: No such file or directory (2)"

Answer 1

What's you playback url? you can check your ffmpeg protocal if support? ffmpeg -protocol