wanp/townengine
2
1
Fork 0
Code Issues 8 Pull Requests Packages Projects Releases Wiki Activity

.xm playback

Browse Source
This commit is contained in:
veclavtalica 2024-07-08 16:58:23 +03:00
parent febe3310aa
commit 0eb851e7bf
3 changed files with 111 additions and 28 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
CMakeLists.txt
View File

@ -15,6 +15,7 @@ set(PHYSFS_BUILD_SHARED FALSE)
set(PHYSFS_DISABLE_INSTALL TRUE)
set(PHYSFS_TARGETNAME_UNINSTALL "physfs_uninstall")
add_subdirectory(third-party/physfs)
add_subdirectory(third-party/libxm)
set(SOURCE_FILES
@ -113,6 +114,7 @@ target_include_directories(${PROJECT_NAME}
PRIVATE
third-party/physfs/src
third-party/physfs/extras
third-party/libxm/include
)
# header-only libraries should be marked as "system includes"
@ -136,6 +138,7 @@ target_link_libraries(${PROJECT_NAME} PUBLIC
SDL2_image::SDL2_image
SDL2_ttf::SDL2_ttf
physfs-static
xms
)
# copy dlls for baby windows

129
src/audio.c
View File

@ -1,5 +1,6 @@
#include "private/audio.h"
#include "audio.h"
#include "config.h"
#include "context.h"
#include "util.h"
@ -22,6 +23,7 @@ static const char *audio_exts[audio_file_type_count] = {
/* TODO: count frames without use, free the memory when threshold is met */
/* TODO: count repeated usages for sound effect cases with rendering to ram? */
/* stores path to data hash, useful for sound effects */
static struct audio_file_cache {
char *key;
@ -110,6 +112,29 @@ static union audio_context init_audio_context(const char *path, t_audio_file_typ
};
}
case audio_file_type_xm: {
unsigned char *data;
int64_t len = get_audio_data(path, &data);
if (len == -1) {
CRY("Audio error", "Error reading file");
break;
}
xm_context_t *handle;
int response = xm_create_context_safe(&handle,
(const char *)data,
(size_t)len,
AUDIO_FREQUENCY);
if (response != 0) {
CRY("Audio error", "Error loading xm module");
break;
}
return (union audio_context) {
.xm = { .handle = handle }
};
}
default:
CRY("Audio error", "Unhandled audio format (in init)");
return (union audio_context){0};
@ -120,9 +145,22 @@ static union audio_context init_audio_context(const char *path, t_audio_file_typ
static void repeat_audio(struct audio_channel *channel) {
(void)channel;
switch (channel->file_type) {
case audio_file_type_ogg: {
stb_vorbis_seek_start(channel->context.vorbis.handle);
break;
}
/* TODO */
case audio_file_type_xm: {
/* TODO: test */
xm_seek(channel->context.xm.handle, 0, 0, 0);
break;
}
default:
CRY("Audio error", "Unhandled audio format (in repeat)");
break;
}
}
@ -160,20 +198,50 @@ t_play_audio_args get_default_audio_args(void) {
}
static void audio_sample_and_mixin_channel(struct audio_channel *channel,
/* this assumes int16_t based streams */
static void audio_mixin_streams(const struct audio_channel *channel,
uint8_t *restrict a,
uint8_t *restrict b,
size_t frames)
{
int16_t *const sa = (int16_t *)a;
int16_t *const sb = (int16_t *)b;
const float left_panning = fminf(fabsf(channel->args.panning - 1.0f), 1.0f);
const float right_panning = fminf(fabsf(channel->args.panning + 1.0f), 1.0f);
#if AUDIO_N_CHANNELS == 2
for (size_t s = 0; s < frames; s += 2) {
/* left channel */
sa[s] += (int16_t)(sb[s] * channel->args.volume * left_panning);
/* right channel */
sa[s + 1] += (int16_t)(sb[s + 1] * channel->args.volume * right_panning);
}
#else
#error "Unimplemented channel count"
#endif
}
/* remember: sample is data for all channels where frame is a part of it */
static void audio_sample_and_mixin_channel(const struct audio_channel *channel,
uint8_t *stream,
int len) {
int16_t *const sstream = (int16_t *)stream;
int len)
{
static uint8_t buffer[16384];
const int buffer_frames = sizeof (buffer) / sizeof (int16_t);
const int int16_buffer_frames = sizeof (buffer) / sizeof (int16_t);
const int float_buffer_frames = sizeof (buffer) / sizeof (float);
const int stream_frames = len / sizeof (int16_t);
switch (channel->file_type) {
case audio_file_type_ogg: {
/* feed stream for needed conversions */
for (int i = 0; i < (len / 2);) {
const int n_frames = ((len / 2) - i) > buffer_frames ? buffer_frames : (len / 2) - i;
for (int i = 0; i < stream_frames; ) {
const int n_frames = (stream_frames - i) > int16_buffer_frames ?
int16_buffer_frames : stream_frames - i;
/* TODO: handle end of file */
const int samples_per_channel = stb_vorbis_get_samples_short_interleaved(
channel->context.vorbis.handle,
channel->context.vorbis.channel_count,
@ -191,24 +259,8 @@ static void audio_sample_and_mixin_channel(struct audio_channel *channel,
}
/* panning and mixing */
const float left_panning = fminf(fabsf(channel->args.panning - 1.0f), 1.0f);
const float right_panning = fminf(fabsf(channel->args.panning + 1.0f), 1.0f);
#if AUDIO_N_CHANNELS == 2
for (int s = 0; s < samples_per_channel * ctx.audio_stream_channel_count; s += 2) {
/* left channel */
sstream[i + s] += (int16_t)(((int16_t *)buffer)[s] *
channel->args.volume * left_panning);
/* right channel */
sstream[i + s + 1] += (int16_t)(((int16_t *)buffer)[s + 1] *
channel->args.volume * right_panning);
}
#else
#error "Unimplemented channel count"
#endif
audio_mixin_streams(channel, &stream[i * sizeof(int16_t)], buffer,
samples_per_channel * ctx.audio_stream_channel_count);
i += samples_per_channel * ctx.audio_stream_channel_count;
}
@ -216,6 +268,29 @@ static void audio_sample_and_mixin_channel(struct audio_channel *channel,
break;
}
case audio_file_type_xm: {
for (int i = 0; i < stream_frames; ) {
const int n_frames = (stream_frames - i) > float_buffer_frames ?
float_buffer_frames : stream_frames - i;
/* TODO: make it report generated frame count and stop right before looping */
xm_generate_samples(channel->context.xm.handle, (float *)buffer, n_frames / 2);
/* convert floats to int16_t */
for (int p = 0; p < n_frames; ++p) {
const int16_t value = (int16_t)(((float *)buffer)[p] * 32768.0f);
((int16_t *)buffer)[p] = value;
}
/* panning and mixing */
audio_mixin_streams(channel, &stream[i * sizeof(int16_t)], buffer, n_frames);
i += n_frames;
}
break;
}
default:
CRY("Audio error", "Unhandled audio format (in sampling)");
break;

5
src/private/audio.h
View File

@ -7,6 +7,7 @@
#define STB_VORBIS_HEADER_ONLY
#include <stb_vorbis.c>
#include <xm.h>
#include <stdbool.h>
#include <stdint.h>
@ -27,6 +28,10 @@ union audio_context {
int frequency;
uint8_t channel_count;
} vorbis;
struct {
xm_context_t *handle;
} xm;
};