Refactor CD-DA flow by removing intermediate buffers and loops
Thanks to @ripsaw8080 for insight into CD-DA channel mapping, @hail-to-the-ryzen for testing and flagging a position-tracking bug, and @dreamer_ for guidance and code review. The CD-DA volume and channel mapping loops were moved to generic mixer calls and no longer require a pre-processing loop: - Application-controlled CD-DA volume adjustment is now applied using an existing mixer volume scalar that was previously unused by the CD-DA code. - Mapping of CD-DA left and right channels is now applied at the tail end of the mixer's sample ingest sequence. The following have been removed: - The CD-DA callback chunk-wise circular buffer - The decode buffers in the Opus and MP3 decoders - The decode buffer and conversion buffers in SDL_Sound These removals and API changes allow the image player's buffer to be passed-through ultimately to the audio codec, skipping multiple intermediate buffers.
This commit is contained in:
krcroft
Patryk Obara
parent
5a9dd2866b
commit
d1a6f373cb
5 changed files with 310 additions and 336 deletions
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@ -36,13 +36,11 @@
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#include "mixer.h"
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#include "../libs/decoders/SDL_sound.h"
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#define RAW_SECTOR_SIZE 2352
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#define COOKED_SECTOR_SIZE 2048
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#define AUDIO_DECODE_BUFFER_SIZE 16512
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// 16512 is 16384 + 128, which enough for four 4KB decode audio chunks plus 128 bytes extra,
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// which accomodate the leftovers from typically callbacks, which also helps minimize
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// most of the time. This size is also an even multiple of 8-bytes, allowing the compiler to
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// use "large-D" SIMD instructions on it.
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// CDROM data and audio format constants
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#define RAW_SECTOR_SIZE 2352
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#define COOKED_SECTOR_SIZE 2048
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#define BYTES_PER_TRACK_FRAME 4
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#define REDBOOK_FRAMES_PER_SECOND 75
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enum { CDROM_USE_SDL, CDROM_USE_ASPI, CDROM_USE_IOCTL_DIO, CDROM_USE_IOCTL_DX, CDROM_USE_IOCTL_MCI };
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@ -53,17 +51,16 @@ typedef struct SMSF {
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} TMSF;
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typedef struct SCtrl {
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Bit8u out[4]; // output channel
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Bit8u vol[4]; // channel volume
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Bit8u out[4]; // output channel mapping
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Bit8u vol[4]; // channel volume (0 to 255)
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} TCtrl;
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// Conversion function from frames to Minutes/Second/Frames
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//
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template<typename T>
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inline void frames_to_msf(int frames, T *m, T *s, T *f) {
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const int cd_fps = 75;
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*f = frames % cd_fps;
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frames /= cd_fps;
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*f = frames % REDBOOK_FRAMES_PER_SECOND;
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frames /= REDBOOK_FRAMES_PER_SECOND;
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*s = frames % 60;
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frames /= 60;
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*m = frames;
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@ -72,8 +69,7 @@ inline void frames_to_msf(int frames, T *m, T *s, T *f) {
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// Conversion function from Minutes/Second/Frames to frames
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//
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inline int msf_to_frames(int m, int s, int f) {
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const int cd_fps = 75;
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return m * 60 * cd_fps + s * cd_fps + f;
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return m * 60 * REDBOOK_FRAMES_PER_SECOND + s * REDBOOK_FRAMES_PER_SECOND + f;
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}
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extern int CDROM_GetMountType(char* path, int force);
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@ -161,7 +157,7 @@ private:
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public:
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virtual bool read(Bit8u *buffer, int seek, int count) = 0;
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virtual bool seek(Bit32u offset) = 0;
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virtual Bit16u decode(Bit8u *buffer) = 0;
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virtual Bit32u decode(Bit16s *buffer, Bit32u desired_track_frames) = 0;
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virtual Bit16u getEndian() = 0;
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virtual Bit32u getRate() = 0;
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virtual Bit8u getChannels() = 0;
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@ -175,7 +171,7 @@ private:
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BinaryFile (const char *filename, bool &error);
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bool read(Bit8u *buffer, int seek, int count);
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bool seek(Bit32u offset);
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Bit16u decode(Bit8u *buffer);
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Bit32u decode(Bit16s *buffer, Bit32u desired_track_frames);
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Bit16u getEndian();
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Bit32u getRate() { return 44100; }
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Bit8u getChannels() { return 2; }
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@ -191,7 +187,7 @@ private:
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AudioFile (const char *filename, bool &error);
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bool read(Bit8u *buffer, int seek, int count) { return false; }
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bool seek(Bit32u offset);
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Bit16u decode(Bit8u *buffer);
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Bit32u decode(Bit16s *buffer, Bit32u desired_track_frames);
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Bit16u getEndian();
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Bit32u getRate();
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Bit8u getChannels();
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@ -237,26 +233,21 @@ static CDROM_Interface_Image* images[26];
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private:
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// player
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static void CDAudioCallBack(Bitu len);
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static void CDAudioCallBack(Bitu desired_frames);
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int GetTrack(int sector);
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static struct imagePlayer {
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Bit8u buffer[AUDIO_DECODE_BUFFER_SIZE];
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TCtrl ctrlData;
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Bit16s buffer[MIXER_BUFSIZE * 2]; // 2 channels (max)
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TrackFile *trackFile;
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MixerChannel *channel;
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CDROM_Interface_Image *cd;
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void (MixerChannel::*addSamples) (Bitu, const Bit16s*);
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Bit32u startFrame;
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Bit32u currFrame;
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Bit32u numFrames;
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Bit32u playbackTotal;
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Bit32s playbackRemaining;
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Bit16u bufferPos;
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Bit16u bufferConsumed;
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void (MixerChannel::*addFrames) (Bitu, const Bit16s*);
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Bit32u startRedbookFrame;
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Bit32u totalRedbookFrames;
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Bit32u playedTrackFrames;
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Bit32u totalTrackFrames;
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bool isPlaying;
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bool isPaused;
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bool ctrlUsed;
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} player;
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void ClearTracks();
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@ -407,7 +398,7 @@ private:
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SDL_mutex *mutex;
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Bit8u buffer[8192];
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int bufLen;
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int currFrame;
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int currFrame;
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int targetFrame;
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bool isPlaying;
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bool isPaused;
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@ -27,14 +27,9 @@
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#include <fstream>
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#include <iostream>
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#include <limits>
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#include <limits.h> //GCC 2.95
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#include <sstream>
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#include <vector>
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#include <sys/stat.h>
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#include "cdrom.h"
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#include "drives.h"
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#include "support.h"
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#include "setup.h"
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#if !defined(WIN32)
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#include <libgen.h>
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@ -42,6 +37,11 @@
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#include <string.h>
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#endif
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#include "cdrom.h"
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#include "drives.h"
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#include "support.h"
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#include "setup.h"
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using namespace std;
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#define MAX_LINE_LENGTH 512
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@ -96,12 +96,8 @@ int CDROM_Interface_Image::BinaryFile::getLength()
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Bit16u CDROM_Interface_Image::BinaryFile::getEndian()
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{
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// Image files are read into native-endian byte-order
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#if defined(WORDS_BIGENDIAN)
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return AUDIO_S16MSB;
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#else
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// Image files are always little endian
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return AUDIO_S16LSB;
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#endif
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}
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@ -111,10 +107,10 @@ bool CDROM_Interface_Image::BinaryFile::seek(Bit32u offset)
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return !file->fail();
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}
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Bit16u CDROM_Interface_Image::BinaryFile::decode(Bit8u *buffer)
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Bit32u CDROM_Interface_Image::BinaryFile::decode(Bit16s *buffer, Bit32u desired_track_frames)
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{
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file->read((char*)buffer, chunkSize);
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return (Bit16u) file->gcount();
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file->read((char*)buffer, desired_track_frames * BYTES_PER_TRACK_FRAME);
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return (Bit32u) file->gcount() / BYTES_PER_TRACK_FRAME;
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}
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CDROM_Interface_Image::AudioFile::AudioFile(const char *filename, bool &error)
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@ -122,7 +118,7 @@ CDROM_Interface_Image::AudioFile::AudioFile(const char *filename, bool &error)
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{
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// Use the audio file's actual sample rate and number of channels as opposed to overriding
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Sound_AudioInfo desired = {AUDIO_S16, 0, 0};
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sample = Sound_NewSampleFromFile(filename, &desired, chunkSize);
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sample = Sound_NewSampleFromFile(filename, &desired);
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if (sample) {
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error = false;
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std::string filename_only(filename);
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@ -166,11 +162,9 @@ bool CDROM_Interface_Image::AudioFile::seek(Bit32u offset)
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return result;
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}
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Bit16u CDROM_Interface_Image::AudioFile::decode(Bit8u *buffer)
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Bit32u CDROM_Interface_Image::AudioFile::decode(Bit16s *buffer, Bit32u desired_track_frames)
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{
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const Bit16u bytes = Sound_Decode(sample);
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memcpy(buffer, sample->buffer, bytes);
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return bytes;
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return Sound_Decode_Direct(sample, (void*)buffer, desired_track_frames);
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}
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Bit16u CDROM_Interface_Image::AudioFile::getEndian()
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@ -213,27 +207,21 @@ int CDROM_Interface_Image::AudioFile::getLength()
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int CDROM_Interface_Image::refCount = 0;
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CDROM_Interface_Image* CDROM_Interface_Image::images[26] = {};
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CDROM_Interface_Image::imagePlayer CDROM_Interface_Image::player = {
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{0}, // buffer[]
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{0}, // ctrlData struct
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nullptr, // TrackFile*
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nullptr, // MixerChannel*
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nullptr, // CDROM_Interface_Image*
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nullptr, // addSamples
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0, // startFrame
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0, // currFrame
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0, // numFrames
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0, // playbackTotal
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0, // playbackRemaining
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0, // bufferPos
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0, // bufferConsumed
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false, // isPlaying
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false, // isPaused
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false // ctrlUsed
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{0}, // buffer[]
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nullptr, // TrackFile*
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nullptr, // MixerChannel*
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nullptr, // CDROM_Interface_Image*
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nullptr, // addFrames
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0, // startRedbookFrame
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0, // totalRedbookFrames
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0, // playedTrackFrames
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0, // totalTrackFrames
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false, // isPlaying
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false // isPaused
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};
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CDROM_Interface_Image::CDROM_Interface_Image(Bit8u subUnit)
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:subUnit(subUnit)
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:subUnit(subUnit)
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{
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images[subUnit] = this;
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if (refCount == 0) {
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@ -242,8 +230,7 @@ CDROM_Interface_Image::CDROM_Interface_Image(Bit8u subUnit)
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player.channel = MIXER_AddChannel(&CDAudioCallBack, 0, "CDAUDIO");
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player.channel->Enable(false);
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#ifdef DEBUG
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LOG_MSG("CDROM: Initialized with %d-byte circular buffer",
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AUDIO_DECODE_BUFFER_SIZE);
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LOG_MSG("%s CDROM: Initialized the CDAUDIO mixer channel", get_time());
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#endif
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}
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}
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@ -262,7 +249,7 @@ CDROM_Interface_Image::~CDROM_Interface_Image()
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MIXER_DelChannel(player.channel);
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player.channel = nullptr;
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#ifdef DEBUG
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LOG_MSG("CDROM: Audio channel freed");
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LOG_MSG("%s CDROM: Audio channel freed", get_time());
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#endif
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}
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}
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@ -343,38 +330,50 @@ bool CDROM_Interface_Image::GetAudioTrackInfo(int track, TMSF& start, unsigned c
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bool CDROM_Interface_Image::GetAudioSub(unsigned char& attr, unsigned char& track,
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unsigned char& index, TMSF& relPos, TMSF& absPos)
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{
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int cur_track = GetTrack(player.currFrame);
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if (cur_track < 1) {
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return false;
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}
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track = (unsigned char)cur_track;
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attr = tracks[track - 1].attr;
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index = 1;
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frames_to_msf(player.currFrame + 150, &absPos.min, &absPos.sec, &absPos.fr);
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frames_to_msf(player.currFrame - tracks[track - 1].start, &relPos.min, &relPos.sec, &relPos.fr);
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bool rcode = false;
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// Convert our running tally of track-frames played to Redbook-frames played.
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// We round up because if our track-frame tally lands in the middle of a (fractional)
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// Redbook frame, then that Redbook frame would have to be considered played to produce
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// even the smallest amount of track-frames played. This also accurately represents
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// the very end of a sequence where the last Redbook frame might only contain a couple
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// PCM samples - but the entire last 2352-byte Redbook frame is needed to cover those samples.
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const Bit32u playedRedbookFrames = static_cast<Bit32u>(ceil(
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static_cast<float>(REDBOOK_FRAMES_PER_SECOND * player.playedTrackFrames) / player.trackFile->getRate() ));
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// Add that to the track's starting Redbook frame to determine our absolute current Redbook frame
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const Bit32u currentRedbookFrame = player.startRedbookFrame + playedRedbookFrames;
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const char cur_track = GetTrack(currentRedbookFrame);
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if (cur_track >= 1) {
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track = static_cast<unsigned char>(cur_track);
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attr = tracks[track - 1].attr;
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index = 1;
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frames_to_msf(currentRedbookFrame + 150, &absPos.min, &absPos.sec, &absPos.fr);
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frames_to_msf(currentRedbookFrame - tracks[track - 1].start, &relPos.min, &relPos.sec, &relPos.fr);
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rcode = true;
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#ifdef DEBUG
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LOG_MSG("%s CDROM: GetAudioSub attr=%u, track=%u, index=%u",
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get_time(),
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attr,
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track,
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index);
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LOG_MSG("%s CDROM: GetAudioSub absoute offset (%d), MSF=%d:%d:%d",
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get_time(),
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player.currFrame + 150,
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absPos.min,
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absPos.sec,
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absPos.fr);
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LOG_MSG("%s CDROM: GetAudioSub relative offset (%d), MSF=%d:%d:%d",
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get_time(),
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player.currFrame - tracks[track - 1].start + 150,
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relPos.min,
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relPos.sec,
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relPos.fr);
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LOG_MSG("%s CDROM: GetAudioSub attr=%u, track=%u, index=%u",
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get_time(),
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attr,
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track,
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index);
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LOG_MSG("%s CDROM: GetAudioSub absoute offset (%d), MSF=%d:%d:%d",
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get_time(),
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currentRedbookFrame + 150,
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absPos.min,
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absPos.sec,
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absPos.fr);
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LOG_MSG("%s CDROM: GetAudioSub relative offset (%d), MSF=%d:%d:%d",
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get_time(),
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currentRedbookFrame - tracks[track - 1].start + 150,
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relPos.min,
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relPos.sec,
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relPos.fr);
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#endif
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return true;
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}
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return rcode;
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}
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bool CDROM_Interface_Image::GetAudioStatus(bool& playing, bool& pause)
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@ -431,7 +430,7 @@ bool CDROM_Interface_Image::PlayAudioSector(unsigned long start, unsigned long l
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// We can't play audio from a data track (as it would result in garbage/static)
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else if (track >= 0 && tracks[track].attr == 0x40)
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LOG(LOG_MISC,LOG_WARN)("Game tries to play the data track. Not doing this");
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LOG(LOG_MISC,LOG_WARN)("Game tried to play the data track. Not doing this");
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// Checks passed, setup the audio stream
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else {
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@ -443,55 +442,46 @@ bool CDROM_Interface_Image::PlayAudioSector(unsigned long start, unsigned long l
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// only initialize the player elements if our track is playable
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if (is_playable) {
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const Bit8u channels = trackFile->getChannels();
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const Bit32u rate = trackFile->getRate();
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const Bit8u track_channels = trackFile->getChannels();
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const Bit32u track_rate = trackFile->getRate();
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player.cd = this;
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player.trackFile = trackFile;
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player.startFrame = start;
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player.currFrame = start;
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player.numFrames = len;
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player.bufferPos = 0;
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player.bufferConsumed = 0;
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player.startRedbookFrame = start;
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player.totalRedbookFrames = len;
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player.isPlaying = true;
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player.isPaused = false;
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#if defined(WORDS_BIGENDIAN)
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if (trackFile->getEndian() != AUDIO_S16SYS)
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#else
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if (trackFile->getEndian() == AUDIO_S16SYS)
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#endif
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player.addSamples = channels == 2 ? &MixerChannel::AddSamples_s16 \
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: &MixerChannel::AddSamples_m16;
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else
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player.addSamples = channels == 2 ? &MixerChannel::AddSamples_s16_nonnative \
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: &MixerChannel::AddSamples_m16_nonnative;
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const float bytesPerMs = (float) (rate * channels * 2 / 1000.0);
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player.playbackTotal = lround(len * tracks[track].sectorSize * bytesPerMs / 176.4);
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player.playbackRemaining = player.playbackTotal;
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if (trackFile->getEndian() == AUDIO_S16SYS) {
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player.addFrames = track_channels == 2 ? &MixerChannel::AddSamples_s16 \
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: &MixerChannel::AddSamples_m16;
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} else {
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player.addFrames = track_channels == 2 ? &MixerChannel::AddSamples_s16_nonnative \
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: &MixerChannel::AddSamples_m16_nonnative;
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}
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// Convert Redbook frames to Track frames, rounding up to whole integer frames.
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// Round up to whole track frames because the content originated from whole redbook frames,
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// which will require the last fractional frames to be represented by a whole PCM frame.
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player.totalTrackFrames = static_cast<Bit32u>(ceil(
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static_cast<float>(track_rate * player.totalRedbookFrames) / REDBOOK_FRAMES_PER_SECOND));
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player.playedTrackFrames = 0;
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#ifdef DEBUG
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LOG_MSG("%s CDROM: Playing track %d at %.1f KHz "
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"%d-channel at start sector %lu (%.1f minute-mark), seek %u "
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"(skip=%d,dstart=%d,secsize=%d), for %lu sectors (%.1f seconds)",
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LOG_MSG("%s CDROM: Playing track %d (%d Hz "
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"%d-channel) at starting sector %lu (%.1f minute-mark) "
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"for %u Redbook frames (%.1f seconds)",
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get_time(),
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track,
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rate/1000.0,
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channels,
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track_rate,
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track_channels,
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start,
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offset * (1/10584000.0),
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||||
offset,
|
||||
tracks[track].skip,
|
||||
tracks[track].start,
|
||||
tracks[track].sectorSize,
|
||||
len,
|
||||
player.playbackRemaining / (1000 * bytesPerMs));
|
||||
static_cast<float>(start) / (REDBOOK_FRAMES_PER_SECOND * 60),
|
||||
player.totalRedbookFrames,
|
||||
static_cast<float>(player.totalRedbookFrames) / REDBOOK_FRAMES_PER_SECOND);
|
||||
#endif
|
||||
|
||||
// start the channel!
|
||||
player.channel->SetFreq(rate);
|
||||
player.channel->SetFreq(track_rate);
|
||||
player.channel->Enable(true);
|
||||
}
|
||||
}
|
||||
|
|
@ -533,8 +523,15 @@ bool CDROM_Interface_Image::StopAudio(void)
|
|||
|
||||
void CDROM_Interface_Image::ChannelControl(TCtrl ctrl)
|
||||
{
|
||||
player.ctrlUsed = (ctrl.out[0]!=0 || ctrl.out[1]!=1 || ctrl.vol[0]<0xfe || ctrl.vol[1]<0xfe);
|
||||
player.ctrlData = ctrl;
|
||||
if (player.channel == NULL) return;
|
||||
|
||||
// Adjust the volume of our mixer channel as defined by the application
|
||||
player.channel->SetScale(static_cast<float>(ctrl.vol[0]/255.0), // left vol
|
||||
static_cast<float>(ctrl.vol[1]/255.0)); // right vol
|
||||
|
||||
// Map the audio channels in our mixer channel as defined by the application
|
||||
player.channel->MapChannels(ctrl.out[0], // left map
|
||||
ctrl.out[1]); // right map
|
||||
}
|
||||
|
||||
bool CDROM_Interface_Image::ReadSectors(PhysPt buffer, bool raw, unsigned long sector, unsigned long num)
|
||||
|
|
@ -590,137 +587,47 @@ bool CDROM_Interface_Image::ReadSector(Bit8u *buffer, bool raw, unsigned long se
|
|||
if (tracks[track].sectorSize == RAW_SECTOR_SIZE && !tracks[track].mode2 && !raw) seek += 16;
|
||||
if (tracks[track].mode2 && !raw) seek += 24;
|
||||
|
||||
#if 0 // Excessively verbose.. only enable if needed
|
||||
#ifdef DEBUG
|
||||
LOG_MSG("CDROM: ReadSector track=%d, desired raw=%s, sector=%ld, length=%d",
|
||||
LOG_MSG("%s CDROM: ReadSector track=%d, desired raw=%s, sector=%ld, length=%d",
|
||||
get_time(),
|
||||
track,
|
||||
raw ? "true":"false",
|
||||
sector,
|
||||
length);
|
||||
#endif
|
||||
#endif
|
||||
|
||||
return tracks[track].file->read(buffer, seek, length);
|
||||
}
|
||||
|
||||
void CDROM_Interface_Image::CDAudioCallBack(Bitu len)
|
||||
|
||||
void CDROM_Interface_Image::CDAudioCallBack(Bitu desired_track_frames)
|
||||
{
|
||||
// Our member object "playbackRemaining" holds the
|
||||
// exact number of stream-bytes we need to play before meeting the
|
||||
// DOS program's desired playback duration in sectors. We simply
|
||||
// decrement this counter each callback until we're done.
|
||||
if (len == 0 || !player.isPlaying || player.isPaused) {
|
||||
return;
|
||||
}
|
||||
if (desired_track_frames > 0) {
|
||||
|
||||
// determine bytes per request (16-bit samples)
|
||||
const Bit8u channels = player.trackFile->getChannels();
|
||||
const Bit8u bytes_per_request = channels * 2;
|
||||
int total_requested = len * bytes_per_request;
|
||||
const Bit32u decoded_track_frames = player.trackFile->decode(player.buffer, desired_track_frames);
|
||||
|
||||
while (total_requested > 0) {
|
||||
int requested = total_requested;
|
||||
// uses either the stereo or mono and native or nonnative AddSamples call assigned during construction
|
||||
(player.channel->*player.addFrames)(decoded_track_frames, player.buffer);
|
||||
|
||||
// Every now and then the callback wants a big number of bytes,
|
||||
// which can exceed our circular buffer. In these cases we need
|
||||
// read through as many iteration of our circular buffer as needed.
|
||||
if (total_requested > AUDIO_DECODE_BUFFER_SIZE) {
|
||||
requested = AUDIO_DECODE_BUFFER_SIZE;
|
||||
total_requested -= AUDIO_DECODE_BUFFER_SIZE;
|
||||
}
|
||||
else {
|
||||
total_requested = 0;
|
||||
// Stop the audio if our decode stream has run dry or when we've played at least the
|
||||
// total number of frames. We consider "played" to mean the running tally so far plus
|
||||
// the current requested frames, which takes into account that the number of currently
|
||||
// decoded frames might be less than desired if we're at the end of the track.
|
||||
// (The mixer will request frames forever until we stop it, so at some point we /will/
|
||||
// decode fewer than requested; in this "tail scenario", we push those remaining decoded
|
||||
// frames into the mixer and then stop the audio.)
|
||||
if (decoded_track_frames == 0
|
||||
|| player.playedTrackFrames + desired_track_frames >= player.totalTrackFrames) {
|
||||
player.cd->StopAudio();
|
||||
}
|
||||
|
||||
// Three scenarios in order of probabilty:
|
||||
//
|
||||
// 1. Consume: If our decoded circular buffer is sufficiently filled to
|
||||
// satify the Mixer's requested size, then feed the Mixer with
|
||||
// the requested number of bytes.
|
||||
//
|
||||
// 2. Wrap: If we've decoded and consumed to edge of our buffer, then
|
||||
// we need to wrap any remaining decoded-but-not-consumed
|
||||
// samples back around to the front of the buffer.
|
||||
//
|
||||
// 3. Fill: When our circular buffer is too depleted to satisfy the
|
||||
// Mixer's requested size, then ask the decoder for more data;
|
||||
// to either enough to completely fill our buffer or whatever
|
||||
// is left to satisfy the remaining samples in this requested
|
||||
// playback sequence (the Mixer is unaware of how much audio
|
||||
// xwe need to play; instead we decide when to cutoff the mixer).
|
||||
//
|
||||
while (true) {
|
||||
|
||||
// 1. Consume
|
||||
if (player.bufferPos - player.bufferConsumed >= requested) {
|
||||
if (player.ctrlUsed) {
|
||||
for (Bit8u i=0; i < channels; i++) {
|
||||
Bit16s sample;
|
||||
Bit16s* samples = (Bit16s*)&player.buffer[player.bufferConsumed];
|
||||
for (int pos = 0; pos < requested / bytes_per_request; pos++) {
|
||||
#if defined(WORDS_BIGENDIAN)
|
||||
sample = (Bit16s)host_readw((HostPt) & samples[pos * 2 + player.ctrlData.out[i]]);
|
||||
#else
|
||||
sample = samples[pos * 2 + player.ctrlData.out[i]];
|
||||
#endif
|
||||
samples[pos * 2 + i] = (Bit16s)(sample * player.ctrlData.vol[i] / 255.0);
|
||||
}
|
||||
}
|
||||
}
|
||||
// uses either the stereo or mono and native or nonnative AddSamples
|
||||
// call assigned during construction
|
||||
(player.channel->*player.addSamples)(requested / bytes_per_request,
|
||||
(Bit16s*)(player.buffer + player.bufferConsumed) );
|
||||
player.bufferConsumed += requested;
|
||||
player.playbackRemaining -= requested;
|
||||
|
||||
// Games can query the current Red Book MSF frame-position, so we keep that up-to-date here.
|
||||
// We scale the final number of frames by the percent complete, which
|
||||
// avoids having to keep track of the equivlent number of Red Book frames
|
||||
// read (which would involve coverting the compressed streams data-rate into
|
||||
// CDROM Red Book rate, which is more work than simply scaling).
|
||||
//
|
||||
const double playbackPercentSoFar = (player.playbackTotal - player.playbackRemaining) / player.playbackTotal;
|
||||
player.currFrame = player.startFrame + (Bit32u) ceil(player.numFrames * playbackPercentSoFar);
|
||||
break;
|
||||
}
|
||||
|
||||
// 2. Wrap
|
||||
else {
|
||||
memcpy(player.buffer,
|
||||
player.buffer + player.bufferConsumed,
|
||||
player.bufferPos - player.bufferConsumed);
|
||||
player.bufferPos -= player.bufferConsumed;
|
||||
player.bufferConsumed = 0;
|
||||
}
|
||||
|
||||
// 3. Fill
|
||||
const Bit16u chunkSize = player.trackFile->chunkSize;
|
||||
while(AUDIO_DECODE_BUFFER_SIZE - player.bufferPos >= chunkSize &&
|
||||
(player.bufferPos - player.bufferConsumed < player.playbackRemaining ||
|
||||
player.bufferPos - player.bufferConsumed < requested) ) {
|
||||
|
||||
const Bit16u decoded = player.trackFile->decode(player.buffer + player.bufferPos);
|
||||
player.bufferPos += decoded;
|
||||
|
||||
// if we decoded less than expected, which could be due to EOF or if the CUE file specified
|
||||
// an exact "INDEX 01 MIN:SEC:FRAMES" value but the compressed track is ever-so-slightly less than
|
||||
// that specified, then simply pad with zeros.
|
||||
const Bit16s underDecode = chunkSize - decoded;
|
||||
if (underDecode > 0) {
|
||||
|
||||
#ifdef DEBUG
|
||||
LOG_MSG("%s CDROM: Underdecoded by %d. Feeding mixer with zeros.",
|
||||
get_time(),
|
||||
underDecode);
|
||||
#endif
|
||||
|
||||
memset(player.buffer + player.bufferPos, 0, underDecode);
|
||||
player.bufferPos += underDecode;
|
||||
}
|
||||
} // end of fill-while
|
||||
} // end of decode and fill loop
|
||||
} // end while total_requested
|
||||
|
||||
if (player.playbackRemaining <= 0) {
|
||||
player.cd->StopAudio();
|
||||
// Increment our tally of played frames by those we just decoded (and fed to the mixer).
|
||||
// Even if we've hit the end of the track and we've stopped the audio, we still want to
|
||||
// increment our tally so subsequent calls to GetAudioSub() return the full number of
|
||||
// frames played.
|
||||
player.playedTrackFrames += decoded_track_frames;
|
||||
}
|
||||
}
|
||||
|
||||
|
|
|
|||
|
|
@ -470,8 +470,15 @@ bool CDROM_Interface_Ioctl::StopAudio(void) {
|
|||
|
||||
void CDROM_Interface_Ioctl::ChannelControl(TCtrl ctrl)
|
||||
{
|
||||
player.ctrlUsed = (ctrl.out[0]!=0 || ctrl.out[1]!=1 || ctrl.vol[0]<0xfe || ctrl.vol[1]<0xfe);
|
||||
player.ctrlData = ctrl;
|
||||
if (player.channel == NULL) return;
|
||||
|
||||
// Adjust the volme of our mixer channel as defined by the application
|
||||
player.channel->SetScale(static_cast<float>(ctrl.vol[0]/255.0), // left vol
|
||||
static_cast<float>(ctrl.vol[1]/255.0)); // right vol
|
||||
|
||||
// Map the audio channels in our mixer channel as defined by the application
|
||||
player.channel->MapChannels(ctrl.out[0], // left map
|
||||
ctrl.out[1]); // right map
|
||||
}
|
||||
|
||||
bool CDROM_Interface_Ioctl::LoadUnloadMedia(bool unload) {
|
||||
|
|
@ -565,16 +572,6 @@ void CDROM_Interface_Ioctl::dx_CDAudioCallBack(Bitu len) {
|
|||
}
|
||||
}
|
||||
SDL_mutexV(player.mutex);
|
||||
if (player.ctrlUsed) {
|
||||
Bit16s sample0,sample1;
|
||||
Bit16s * samples=(Bit16s *)&player.buffer;
|
||||
for (Bitu pos=0;pos<len/4;pos++) {
|
||||
sample0=samples[pos*2+player.ctrlData.out[0]];
|
||||
sample1=samples[pos*2+player.ctrlData.out[1]];
|
||||
samples[pos*2+0]=(Bit16s)(sample0*player.ctrlData.vol[0]/255.0);
|
||||
samples[pos*2+1]=(Bit16s)(sample1*player.ctrlData.vol[1]/255.0);
|
||||
}
|
||||
}
|
||||
player.channel->AddSamples_s16(len/4,(Bit16s *)player.buffer);
|
||||
memmove(player.buffer, &player.buffer[len], player.bufLen - len);
|
||||
player.bufLen -= len;
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue