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#include "stdafx.h"
#include "Mp3Sound.h"
#include "Exception.h"
#include "Core/Convert.h"
#include "Utils/Memory.h"
#include <limits>
namespace sound {
/**
* Allocated in a non-moving pool so that we can pass the handle to mpg123.
*/
struct Mp3Stream {
IStream *src;
Bool seekable;
};
/**
* Type description for Mp3Stream above.
*/
static storm::GcType mp3StreamType = {
GcType::tFixed,
null, // type
null, // finalizer
sizeof(Mp3Stream), // stride
1, // # of offsets
{ OFFSET_OF(Mp3Stream, src) }, // Offset to 'stream'.
};
Mp3Sound::Mp3Sound(IStream *src, Bool seekable) : rate(0), ch(0), h(null), stream(null), atEnd(false) {
// TODO: Pick dithering decoder?
h = mpg123_new(NULL, NULL);
int flags = MPG123_FORCE_FLOAT;
// Note: we can use MPG123_PICTURE to load ID3v2 images.
if (seekable)
flags |= MPG123_FORCE_SEEKABLE;
else
flags |= MPG123_NO_PEEK_END;
mpg123_param(h, MPG123_FLAGS, flags, 0);
stream = (Mp3Stream *)runtime::allocStaticRaw(engine(), &mp3StreamType);
stream->src = src;
stream->seekable = seekable;
mpg123_replace_reader_handle(h, &Mp3Sound::read, &Mp3Sound::seek, &Mp3Sound::cleanup);
int ok = mpg123_open_handle(h, stream);
long rate = 0;
int channels, encoding = 0;
if (ok == MPG123_OK) {
ok = mpg123_getformat(h, &rate, &channels, &encoding);
}
if (ok == MPG123_OK) {
// It seems mpg123 could indicate 'stereo and mono' using 'channels == 3'.
if (channels > 2)
channels = 2;
this->rate = rate;
this->ch = channels;
if (encoding != MPG123_ENC_FLOAT_32) {
mpg123_delete(h);
h = null;
throw new (this) SoundOpenError(S("Expected float output from mpg123."));
}
} else {
Str *msg = new (this) Str(toWChar(engine(), mpg123_strerror(h)));
mpg123_delete(h);
h = null;
throw new (this) SoundOpenError(msg);
}
}
Mp3Sound::~Mp3Sound() {
// Do not try to close the stream. That might already have been done.
stream = null;
close();
}
void Mp3Sound::close() {
// Close MP3 decoder.
if (h) {
mpg123_delete(h);
h = null;
}
if (stream && stream->src) {
stream->src->close();
stream->src = null;
stream = null;
}
}
Word Mp3Sound::tell() {
if (stream && stream->seekable) {
return Word(mpg123_tell(h));
}
return 0;
}
Bool Mp3Sound::seek(Word to) {
if (stream && stream->seekable) {
atEnd = false;
return mpg123_seek(h, off_t(to), SEEK_SET) >= 0;
}
return false;
}
Word Mp3Sound::length() {
if (stream && stream->seekable) {
off_t l = mpg123_length(h);
if (l == MPG123_ERR) {
// Try calling mpg123_scan to find the length.
mpg123_scan(h);
l = mpg123_length(h);
}
if (l == MPG123_ERR)
return 0;
return Word(l);
}
return 0;
}
Nat Mp3Sound::sampleFreq() const {
return rate;
}
Nat Mp3Sound::channels() const {
return ch;
}
Buffer Mp3Sound::read(Buffer to) {
if (atEnd)
return to;
Nat free = to.count() - to.filled();
size_t filled = 0;
int ok = mpg123_read(h, (byte *)(to.dataPtr() + to.filled()), free * sizeof(float), &filled);
if (ok != MPG123_OK) {
switch (ok) {
case MPG123_NEW_FORMAT:
WARNING(L"Multi-format files not supported.");
break;
case MPG123_DONE:
break;
default:
WARNING(mpg123_strerror(h));
break;
}
atEnd = true;
}
if (filled == 0)
atEnd = true;
to.filled(to.filled() + Nat(filled/sizeof(float)));
return to;
}
Bool Mp3Sound::more() {
return !atEnd;
}
ssize_t Mp3Sound::read(void *handle, void *to, size_t count) {
Mp3Stream *stream = (Mp3Stream *)handle;
storm::Buffer b = stream->src->read(Nat(min(size_t(std::numeric_limits<Nat>::max()), count)));
memcpy(to, b.dataPtr(), b.filled());
return b.filled();
}
off_t Mp3Sound::seek(void *handle, off_t offset, int mode) {
Mp3Stream *stream = (Mp3Stream *)handle;
if (!stream->seekable)
return -1;
// We know this is possible since we checked 'seekable'.
RIStream *src = (RIStream *)stream->src;
switch (mode) {
case SEEK_SET:
src->seek(Word(offset));
break;
case SEEK_CUR:
src->seek(Word(src->tell() + offset));
break;
case SEEK_END:
src->seek(Word(src->length() + offset));
break;
default:
return -1;
}
return off_t(src->tell());
}
void Mp3Sound::cleanup(void *handle) {
Mp3Stream *stream = (Mp3Stream *)handle;
if (stream->src)
stream->src->close();
}
Mp3Sound *openMp3(RIStream *src) {
return new (src) Mp3Sound(src, true);
}
Mp3Sound *openMp3Stream(IStream *src) {
return new (src) Mp3Sound(src, false);
}
}
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