More work on vorbis decoder
* added support for decoding from a section of a file descriptor (needed if decoding from an asset inside APK) * implemented seek function
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@ -1,5 +1,6 @@
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#include <unistd.h>
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#include <stdlib.h>
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#include <errno.h>
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#include "Tremor/ivorbisfile.h"
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#include "com_jme3_audio_plugins_NativeVorbisFile.h"
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@ -18,40 +19,105 @@ typedef struct
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{
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JNIEnv* env;
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int fd;
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int start;
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int end;
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int current;
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}
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FileDescWrapper;
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// size_t read (int fd, void *buf, size_t nbytes)
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static size_t FileDesc_read(void *ptr, size_t size, size_t nmemb, void *datasource)
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{
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FileDescWrapper* wrapper = (FileDescWrapper*)datasource;
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size_t totalRead = read(wrapper->fd, ptr, size * nmemb);
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LOGI("read(%zu) = %zu", size * nmemb, totalRead);
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int req_size = size * nmemb;
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int to_read = req_size;
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return totalRead;
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if (wrapper->end - wrapper->current > req_size)
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{
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to_read = wrapper->end - wrapper->current;
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}
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if (to_read <= 0)
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{
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return 0;
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}
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size_t total_read = read(wrapper->fd, ptr, to_read);
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if (total_read > 0)
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{
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wrapper->current += total_read;
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}
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LOGI("FD read(%d) = %zu", to_read, total_read);
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return total_read;
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}
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// off64_t lseek64(int fd, off64_t offset, int whence);
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static int FileDesc_seek(void *datasource, ogg_int64_t offset, int whence)
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{
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FileDescWrapper* wrapper = (FileDescWrapper*)datasource;
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int result = lseek64(wrapper->fd, offset, whence);
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char* whenceStr;
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switch (whence) {
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case SEEK_CUR: whenceStr = "SEEK_CUR"; break;
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case SEEK_END: whenceStr = "SEEK_END"; break;
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case SEEK_SET: whenceStr = "SEEK_SET"; break;
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default: whenceStr = "unknown"; break;
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int actual_offset;
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switch (whence)
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{
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case SEEK_SET:
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// set the offset relative to start location.
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actual_offset = wrapper->start + offset;
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break;
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case SEEK_END:
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// seek from the end of the file.
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// offset needs to be negative in this case.
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actual_offset = wrapper->end + offset;
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break;
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case SEEK_CUR:
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// seek relative to current position.
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actual_offset = wrapper->current + offset;
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break;
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default:
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// invalid whence.
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errno = EINVAL;
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return (off_t)-1;
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}
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LOGI("seek(%lld, %s) = %d", offset, whenceStr, result);
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if (actual_offset < wrapper->start ||
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actual_offset > wrapper->end)
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{
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// actual offset should be within our acceptable range.
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errno = EINVAL;
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return (off_t)-1;
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}
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int result = lseek64(wrapper->fd, actual_offset, SEEK_SET);
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LOGI("FD seek(%d) = %d", actual_offset, result);
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if (result < 0)
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{
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// failed, errno should have been set by lseek.
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return (off_t)-1;
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}
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if (result != actual_offset)
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{
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// did not seek the expected amount. something wrong here.
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errno = EINVAL;
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return (off_t)-1;
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}
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// seek succeeded.
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// update current position
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wrapper->current = actual_offset;
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}
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static int FileDesc_close(void *datasource)
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{
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FileDescWrapper* wrapper = (FileDescWrapper*)datasource;
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LOGI("close");
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LOGI("FD close");
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return close(wrapper->fd);
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}
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@ -61,7 +127,14 @@ static long FileDesc_tell(void *datasource)
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FileDescWrapper* wrapper = (FileDescWrapper*)datasource;
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long result = lseek64(wrapper->fd, 0, SEEK_CUR);
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LOGI("tell = %ld", result);
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LOGI("FD tell = %ld", result);
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if (wrapper->current != result)
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{
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// Not sure how to deal with this.
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LOGI("PROBLEM: stored offset does not match actual: %d != %ld",
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wrapper->current, result);
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}
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return result;
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}
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@ -102,15 +175,18 @@ JNIEXPORT void JNICALL Java_com_jme3_audio_plugins_NativeVorbisFile_nativeInit
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}
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JNIEXPORT void JNICALL Java_com_jme3_audio_plugins_NativeVorbisFile_open
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(JNIEnv *env, jobject nvf, jint fd)
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(JNIEnv *env, jobject nvf, jint fd, jlong off, jlong len)
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{
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LOGI("open: %d", fd)
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LOGI("open: fd = %d, off = %lld, len = %lld", fd, off, len);
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OggVorbis_File* ovf = (OggVorbis_File*) malloc(sizeof(OggVorbis_File));
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FileDescWrapper* wrapper = (FileDescWrapper*) malloc(sizeof(FileDescWrapper));
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wrapper->fd = fd;
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wrapper->env = env; // NOTE: every java call has to update this
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wrapper->start = off;
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wrapper->current = off;
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wrapper->end = off + len;
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int result = ov_open_callbacks((void*)wrapper, ovf, NULL, 0, FileDescCallbacks);
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@ -148,7 +224,17 @@ JNIEXPORT void JNICALL Java_com_jme3_audio_plugins_NativeVorbisFile_open
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JNIEXPORT void JNICALL Java_com_jme3_audio_plugins_NativeVorbisFile_seekTime
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(JNIEnv *env, jobject nvf, jdouble time)
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{
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jobject nvfBuf = (*env)->GetObjectField(env, nvf, nvf_field_ovf);
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OggVorbis_File* ovf = (OggVorbis_File*) (*env)->GetDirectBufferAddress(env, nvfBuf);
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int result = ov_time_seek(ovf, time);
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if (result != 0)
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{
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char err[512];
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sprintf(err, "ov_time_seek failed: %d", result);
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throwIOException(env, err);
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}
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}
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JNIEXPORT jint JNICALL Java_com_jme3_audio_plugins_NativeVorbisFile_read
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@ -19,11 +19,11 @@ public class NativeVorbisFile {
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nativeInit();
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}
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public NativeVorbisFile(int fd) throws IOException {
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open(fd);
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public NativeVorbisFile(int fd, long off, long len) throws IOException {
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open(fd, off, len);
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}
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private native void open(int fd) throws IOException;
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private native void open(int fd, long off, long len) throws IOException;
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public native void seekTime(double time) throws IOException;
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@ -65,7 +65,9 @@ public class NativeVorbisLoader implements AssetLoader {
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AssetFileDescriptor afd = aai.openFileDescriptor();
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int fd = afd.getParcelFileDescriptor().getFd();
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NativeVorbisFile file = new NativeVorbisFile(fd);
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NativeVorbisFile file = new NativeVorbisFile(fd, afd.getStartOffset(),
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afd.getLength());
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ByteBuffer data = BufferUtils.createByteBuffer(file.totalBytes);
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file.readFully(data);
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AudioBuffer ab = new AudioBuffer();
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