コード例 #1
0
ファイル: podax_MPG123.c プロジェクト: 4johndoe/Podax
JNIEXPORT jlong JNICALL Java_com_axelby_podax_player_MPG123_openFile
	(JNIEnv *env, jclass c, jstring filename)
{
    int err = MPG123_OK;
    mpg123_handle *mh = mpg123_new(NULL, &err);
    if (err == MPG123_OK && mh != NULL)
    {
        MP3File* mp3 = mp3file_init(mh);
        const char* fileString = (*env)->GetStringUTFChars(env, filename, NULL);
        err = mpg123_open(mh, fileString);
        (*env)->ReleaseStringUTFChars(env, filename, fileString);

        if (err == MPG123_OK)
        {
            int encoding;
            if (mpg123_getformat(mh, &mp3->rate, &mp3->channels, &encoding) == MPG123_OK)
            {
                if(encoding == MPG123_ENC_SIGNED_16)
                {
                    // Signed 16 is the default output format anyway;
                    // it would actually by only different if we forced it.
                    // So this check is here just for this explanation.

                    // Ensure that this output format will not change
                    // (it could, when we allow it).
                    mpg123_format_none(mh);
                    mpg123_format(mh, mp3->rate, mp3->channels, encoding);

                    mp3->buffer_size = mpg123_outblock(mh);
                    mp3->buffer = (unsigned char*)malloc(mp3->buffer_size);

                    mp3->num_samples = mpg123_length(mh);
					mp3->samples_per_frame = mpg123_spf(mh);
					mp3->secs_per_frame = mpg123_tpf(mh);

                    if (mp3->num_samples == MPG123_ERR || mp3->samples_per_frame < 0)
                        mp3->num_frames = 0;
                    else
                        mp3->num_frames = mp3->num_samples / mp3->samples_per_frame;

					if (mp3->num_samples == MPG123_ERR || mp3->samples_per_frame < 0 || mp3->secs_per_frame < 0)
						mp3->duration = 0;
					else
						mp3->duration = mp3->num_samples / mp3->samples_per_frame * mp3->secs_per_frame;

                    return (jlong)mp3;
                }
            }
        }
        mp3file_delete(mp3);
    } else {
		__android_log_write(ANDROID_LOG_INFO, "podax-jni", mpg123_plain_strerror(err));
	}
    return 0;
}
コード例 #2
0
JNIEXPORT void JNICALL Java_com_axelby_mp3decoders_MPG123_delete
	(JNIEnv *env, jclass c, jlong handle)
{
	MP3File *mp3 = (MP3File*)handle;
	mp3file_delete(mp3);
}
コード例 #3
0
JNIEXPORT jlong JNICALL Java_com_axelby_mp3decoders_MPG123_openFile
	(JNIEnv *env, jclass c, jstring filename)
{
	int err = MPG123_OK;
	mpg123_handle *mh = mpg123_new(NULL, &err);
	if (err != MPG123_OK) {
		printerr("mpg123_new", err);
		return 0;
	}
	if (mh == NULL) {
		__android_log_write(ANDROID_LOG_INFO, "podax-jni", "mpg123_handle is NULL");
		return 0;
	}

	MP3File* mp3 = mp3file_init(mh);
	const char* fileString = (*env)->GetStringUTFChars(env, filename, NULL);
	err = mpg123_open(mh, fileString);
	if (err != MPG123_OK)
	{
		printerr("mpg123_open", err);
		(*env)->ReleaseStringUTFChars(env, filename, fileString);
		mp3file_delete(mp3);
		return err;
	}

	// in podax, remove next line and uncomment block
	mpg123_scan(mh);
	/*
	char* index_fn = calloc(1, strlen(fileString) + 6 + 1);
	strcpy(index_fn, fileString);
	// remove last path (Podcasts/)
	char* lastSlash = strrchr(index_fn, '/');
	char* lastDir = strstr(index_fn, "/Podcasts/");
	memmove(lastDir, lastSlash, index_fn + strlen(index_fn) - lastSlash + 1);
	strcat(index_fn, ".index");
	(*env)->ReleaseStringUTFChars(env, filename, fileString);

	// save / restore index for fast seeking
	size_t idx_fill;
	off_t idx_step;
	off_t* idx_offsets;
	FILE* index_file = fopen(index_fn, "rb");
	if (index_file != NULL) {
		fread(&idx_fill, sizeof(size_t), 1, index_file);
		fread(&idx_step, sizeof(off_t), 1, index_file);
		idx_offsets = malloc(idx_fill * sizeof(off_t));
		fread(idx_offsets, sizeof(off_t), idx_fill, index_file);
		fclose(index_file);
		mpg123_set_index(mh, idx_offsets, idx_step, idx_fill);
	} else {
		mpg123_scan(mh);
		mpg123_index(mh, &idx_offsets, &idx_step, &idx_fill);
		index_file = fopen(index_fn, "wb");
		fwrite(&idx_fill, sizeof(size_t), 1, index_file);
		fwrite(&idx_step, sizeof(off_t), 1, index_file);
		fwrite(idx_offsets, sizeof(off_t), idx_fill, index_file);
		fclose(index_file);
	}
	free(index_fn);
	*/

	// determine format and length
	mp3file_determineStats(mp3);
	return (jlong)mp3;
}