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;
}
JNIEXPORT void JNICALL Java_com_axelby_mp3decoders_MPG123_delete
(JNIEnv *env, jclass c, jlong handle)
{
MP3File *mp3 = (MP3File*)handle;
mp3file_delete(mp3);
}
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;
}