mirror of
https://github.com/libretro/scummvm.git
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258 lines
6.5 KiB
C++
258 lines
6.5 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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*/
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// Disable symbol overrides for FILE and fseek as those are used in the
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// Vorbis headers.
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#define FORBIDDEN_SYMBOL_EXCEPTION_FILE
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#define FORBIDDEN_SYMBOL_EXCEPTION_fseek
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#include "audio/decoders/vorbis.h"
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#ifdef USE_VORBIS
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#include "common/ptr.h"
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#include "common/stream.h"
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#include "common/textconsole.h"
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#include "common/util.h"
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#include "audio/audiostream.h"
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#ifdef USE_TREMOR
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#ifdef USE_TREMOLO
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#include <tremolo/ivorbisfile.h>
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#else
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#include <tremor/ivorbisfile.h>
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#endif
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#else
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#define OV_EXCLUDE_STATIC_CALLBACKS
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#include <vorbis/vorbisfile.h>
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#endif
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namespace Audio {
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// These are wrapper functions to allow using a SeekableReadStream object to
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// provide data to the OggVorbis_File object.
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static size_t read_stream_wrap(void *ptr, size_t size, size_t nmemb, void *datasource) {
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Common::SeekableReadStream *stream = (Common::SeekableReadStream *)datasource;
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uint32 result = stream->read(ptr, size * nmemb);
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return result / size;
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}
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static int seek_stream_wrap(void *datasource, ogg_int64_t offset, int whence) {
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Common::SeekableReadStream *stream = (Common::SeekableReadStream *)datasource;
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stream->seek((int32)offset, whence);
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return stream->pos();
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}
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static int close_stream_wrap(void *datasource) {
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// Do nothing -- we leave it up to the VorbisStream to free memory as appropriate.
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return 0;
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}
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static long tell_stream_wrap(void *datasource) {
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Common::SeekableReadStream *stream = (Common::SeekableReadStream *)datasource;
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return stream->pos();
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}
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static ov_callbacks g_stream_wrap = {
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read_stream_wrap, seek_stream_wrap, close_stream_wrap, tell_stream_wrap
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};
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#pragma mark -
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#pragma mark --- Ogg Vorbis stream ---
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#pragma mark -
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class VorbisStream : public SeekableAudioStream {
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protected:
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Common::DisposablePtr<Common::SeekableReadStream> _inStream;
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bool _isStereo;
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int _rate;
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Timestamp _length;
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OggVorbis_File _ovFile;
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int16 _buffer[4096];
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const int16 *_bufferEnd;
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const int16 *_pos;
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public:
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// startTime / duration are in milliseconds
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VorbisStream(Common::SeekableReadStream *inStream, DisposeAfterUse::Flag dispose);
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~VorbisStream();
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int readBuffer(int16 *buffer, const int numSamples);
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bool endOfData() const { return _pos >= _bufferEnd; }
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bool isStereo() const { return _isStereo; }
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int getRate() const { return _rate; }
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bool seek(const Timestamp &where);
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Timestamp getLength() const { return _length; }
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protected:
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bool refill();
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};
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VorbisStream::VorbisStream(Common::SeekableReadStream *inStream, DisposeAfterUse::Flag dispose) :
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_inStream(inStream, dispose),
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_length(0, 1000),
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_bufferEnd(ARRAYEND(_buffer)) {
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int res = ov_open_callbacks(inStream, &_ovFile, NULL, 0, g_stream_wrap);
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if (res < 0) {
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warning("Could not create Vorbis stream (%d)", res);
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_pos = _bufferEnd;
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return;
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}
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// Read in initial data
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if (!refill())
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return;
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// Setup some header information
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_isStereo = ov_info(&_ovFile, -1)->channels >= 2;
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_rate = ov_info(&_ovFile, -1)->rate;
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#ifdef USE_TREMOR
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_length = Timestamp(ov_time_total(&_ovFile, -1), getRate());
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#else
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_length = Timestamp(uint32(ov_time_total(&_ovFile, -1) * 1000.0), getRate());
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#endif
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}
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VorbisStream::~VorbisStream() {
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ov_clear(&_ovFile);
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}
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int VorbisStream::readBuffer(int16 *buffer, const int numSamples) {
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int samples = 0;
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while (samples < numSamples && _pos < _bufferEnd) {
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const int len = MIN(numSamples - samples, (int)(_bufferEnd - _pos));
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memcpy(buffer, _pos, len * 2);
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buffer += len;
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_pos += len;
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samples += len;
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if (_pos >= _bufferEnd) {
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if (!refill())
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break;
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}
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}
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return samples;
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}
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bool VorbisStream::seek(const Timestamp &where) {
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// Vorbisfile uses the sample pair number, thus we always use "false" for the isStereo parameter
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// of the convertTimeToStreamPos helper.
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int res = ov_pcm_seek(&_ovFile, convertTimeToStreamPos(where, getRate(), false).totalNumberOfFrames());
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if (res) {
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warning("Error seeking in Vorbis stream (%d)", res);
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_pos = _bufferEnd;
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return false;
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}
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return refill();
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}
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bool VorbisStream::refill() {
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// Read the samples
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uint len_left = sizeof(_buffer);
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char *read_pos = (char *)_buffer;
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while (len_left > 0) {
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long result;
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#ifdef USE_TREMOR
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// Tremor ov_read() always returns data as signed 16 bit interleaved PCM
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// in host byte order. As such, it does not take arguments to request
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// specific signedness, byte order or bit depth as in Vorbisfile.
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result = ov_read(&_ovFile, read_pos, len_left,
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NULL);
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#else
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#ifdef SCUMM_BIG_ENDIAN
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result = ov_read(&_ovFile, read_pos, len_left,
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1,
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2, // 16 bit
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1, // signed
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NULL);
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#else
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result = ov_read(&_ovFile, read_pos, len_left,
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0,
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2, // 16 bit
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1, // signed
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NULL);
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#endif
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#endif
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if (result == OV_HOLE) {
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// Possibly recoverable, just warn about it
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warning("Corrupted data in Vorbis file");
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} else if (result == 0) {
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//warning("End of file while reading from Vorbis file");
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//_pos = _bufferEnd;
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//return false;
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break;
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} else if (result < 0) {
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warning("Error reading from Vorbis stream (%d)", int(result));
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_pos = _bufferEnd;
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// Don't delete it yet, that causes problems in
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// the CD player emulation code.
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return false;
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} else {
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len_left -= result;
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read_pos += result;
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}
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}
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_pos = _buffer;
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_bufferEnd = (int16 *)read_pos;
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return true;
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}
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#pragma mark -
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#pragma mark --- Ogg Vorbis factory functions ---
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#pragma mark -
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SeekableAudioStream *makeVorbisStream(
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Common::SeekableReadStream *stream,
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DisposeAfterUse::Flag disposeAfterUse) {
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SeekableAudioStream *s = new VorbisStream(stream, disposeAfterUse);
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if (s && s->endOfData()) {
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delete s;
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return 0;
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} else {
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return s;
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}
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}
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} // End of namespace Audio
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#endif // #ifdef USE_VORBIS
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