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vlc/modules/visualization/glspectrum.c

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/*****************************************************************************
* glspectrum.c: spectrum visualization module based on OpenGL
*****************************************************************************
* Copyright © 2009-2013 VLC authors and VideoLAN
*
* Authors: Adrien Maglo <magsoft@videolan.org>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
*****************************************************************************/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <assert.h>
#include <vlc_common.h>
#include <vlc_plugin.h>
#include <vlc_aout.h>
#include <vlc_window.h>
#include <vlc_opengl.h>
#include <vlc_filter.h>
#include <vlc_queue.h>
#include <vlc_rand.h>
#include <math.h>
#include "visual/fft.h"
#include "visual/window.h"
#include "../video_output/opengl/gl_common.h"
/*****************************************************************************
* Module descriptor
*****************************************************************************/
static int Open(vlc_object_t *);
static void Close(filter_t *);
#define WIDTH_TEXT N_("Video width")
#define WIDTH_LONGTEXT N_("The width of the visualization window, in pixels.")
#define HEIGHT_TEXT N_("Video height")
#define HEIGHT_LONGTEXT N_("The height of the visualization window, in pixels.")
vlc_module_begin()
set_shortname(N_("glSpectrum"))
set_description(N_("3D OpenGL spectrum visualization"))
set_capability("visualization", 0)
set_subcategory(SUBCAT_AUDIO_VISUAL)
add_integer("glspectrum-width", 400, WIDTH_TEXT, WIDTH_LONGTEXT)
add_integer("glspectrum-height", 300, HEIGHT_TEXT, HEIGHT_LONGTEXT)
add_shortcut("glspectrum")
set_callback(Open)
vlc_module_end()
/* Legacy glBegin()/glEnd() API */
typedef void (APIENTRY *PFNGLMATRIXMODEPROC)(GLenum);
typedef void (APIENTRY *PFNGLPUSHMATRIXPROC)(void);
typedef void (APIENTRY *PFNGLPOPMATRIXPROC)(void);
typedef void (APIENTRY *PFNGLFRUSTUMPROC)(GLdouble, GLdouble, GLdouble, GLdouble, GLdouble, GLdouble);
typedef void (APIENTRY *PFNGLTRANSLATEFPROC)(float, float, float);
typedef void (APIENTRY *PFNGLSCALEFPROC)(float, float, float);
typedef void (APIENTRY *PFNGLROTATEFPROC)(float, float, float, float);
typedef void (APIENTRY *PFNGLCOLORMATERIALPROC)(GLenum, GLenum);
typedef void (APIENTRY *PFNGLCOLOR4FPROC)(float, float, float, float);
typedef void (APIENTRY *PFNGLLIGHTFVPROC)(GLenum, GLenum, const float*);
typedef void (APIENTRY *PFNGLSHADEMODELPROC)(GLenum);
typedef void (APIENTRY *PFNGLVERTEXPOINTERPROC)(GLint, GLenum, GLsizei, const void *);
typedef void (APIENTRY *PFNGLNORMALPOINTERPROC)(GLenum, GLsizei, const void *);
typedef void (APIENTRY *PFNGLENABLECLIENTSTATEPROC)(GLenum);
typedef void (APIENTRY *PFNGLDISABLECLIENTSTATEPROC)(GLenum);
#define OPENGL_VTABLE_F(F) \
/* Usual functions */ \
F(PFNGLENABLEPROC , Enable) \
F(PFNGLCLEARPROC , Clear) \
F(PFNGLDRAWARRAYSPROC , DrawArrays) \
F(PFNGLDEPTHMASKPROC , DepthMask) \
F(PFNGLBLENDFUNCPROC , BlendFunc) \
F(PFNGLVIEWPORTPROC , Viewport) \
/* Legacy fixed pipeline functions */ \
F(PFNGLMATRIXMODEPROC , MatrixMode ) \
F(PFNGLPUSHMATRIXPROC , PushMatrix) \
F(PFNGLPOPMATRIXPROC , PopMatrix) \
F(PFNGLFRUSTUMPROC , Frustum) \
F(PFNGLTRANSLATEFPROC , Translatef) \
F(PFNGLSCALEFPROC , Scalef) \
F(PFNGLROTATEFPROC , Rotatef) \
F(PFNGLCOLORMATERIALPROC , ColorMaterial) \
F(PFNGLCOLOR4FPROC , Color4f) \
F(PFNGLLIGHTFVPROC , Lightfv) \
F(PFNGLSHADEMODELPROC , ShadeModel) \
F(PFNGLVERTEXPOINTERPROC , VertexPointer) \
F(PFNGLNORMALPOINTERPROC , NormalPointer) \
F(PFNGLENABLECLIENTSTATEPROC , EnableClientState) \
F(PFNGLDISABLECLIENTSTATEPROC , DisableClientState)
struct glspectrum_opengl_vtable
{
#define DECLARE_VTABLE(type, symbol) \
type symbol;
OPENGL_VTABLE_F(DECLARE_VTABLE)
};
/*****************************************************************************
* Local prototypes
*****************************************************************************/
typedef struct
{
vlc_thread_t thread;
/* Audio data */
vlc_queue_t queue;
bool dead;
unsigned i_channels;
unsigned i_prev_nb_samples;
int16_t *p_prev_s16_buff;
/* Opengl */
vlc_gl_t *gl;
struct glspectrum_opengl_vtable vt;
float f_rotationAngle;
float f_rotationIncrement;
/* FFT window parameters */
window_param wind_param;
} filter_sys_t;
static block_t *DoWork(filter_t *, block_t *);
static void *Thread(void *);
#define SPECTRUM_WIDTH 4.f
#define NB_BANDS 20
#define ROTATION_INCREMENT .1f
#define BAR_DECREMENT .075f
#define ROTATION_MAX 20
const GLfloat lightZeroColor[] = {1.0f, 1.0f, 1.0f, 1.0f};
const GLfloat lightZeroPosition[] = {0.0f, 3.0f, 10.0f, 0.0f};
static const struct vlc_filter_operations filter_ops = {
.filter_audio = DoWork, .close = Close,
};
/**
* Open the module.
* @param p_this: the filter object
* @return VLC_SUCCESS or vlc error codes
*/
static int Open(vlc_object_t * p_this)
{
filter_t *p_filter = (filter_t *)p_this;
filter_sys_t *p_sys = vlc_obj_malloc(p_this, sizeof (*p_sys));
if (p_sys == NULL)
return VLC_ENOMEM;
p_filter->p_sys = p_sys;
/* Create the object for the thread */
p_sys->i_channels = aout_FormatNbChannels(&p_filter->fmt_in.audio);
p_sys->i_prev_nb_samples = 0;
p_sys->p_prev_s16_buff = NULL;
p_sys->f_rotationAngle = 0;
p_sys->f_rotationIncrement = ROTATION_INCREMENT;
/* Fetch the FFT window parameters */
window_get_param( VLC_OBJECT( p_filter ), &p_sys->wind_param );
/* Create the FIFO for the audio data. */
vlc_queue_Init(&p_sys->queue, offsetof (block_t, p_next));
p_sys->dead = false;
/* Create the openGL provider */
vlc_window_cfg_t cfg = {
.is_decorated = true,
.width = var_InheritInteger(p_filter, "glspectrum-width"),
.height = var_InheritInteger(p_filter, "glspectrum-height"),
};
p_sys->gl = vlc_gl_surface_Create(p_this, &cfg, NULL, NULL);
if (p_sys->gl == NULL)
return VLC_EGENERIC;
if (vlc_gl_MakeCurrent(p_sys->gl) != VLC_SUCCESS)
{
msg_Err(p_filter, "Can't attach gl context");
goto error;
}
#define LOAD_SYMBOL(type, name) do { \
p_sys->vt.name = vlc_gl_GetProcAddress(p_sys->gl, "gl" #name); \
if (p_sys->vt.name == NULL) { \
vlc_gl_ReleaseCurrent(p_sys->gl); \
goto error; \
} \
} while(0);
OPENGL_VTABLE_F(LOAD_SYMBOL);
vlc_gl_ReleaseCurrent(p_sys->gl);
/* Create the thread */
if (vlc_clone(&p_sys->thread, Thread, p_filter)) {
vlc_gl_surface_Destroy(p_sys->gl);
return VLC_ENOMEM;
}
p_filter->fmt_in.audio.i_format = VLC_CODEC_FL32;
p_filter->fmt_out.audio = p_filter->fmt_in.audio;
p_filter->ops = &filter_ops;
return VLC_SUCCESS;
error:
vlc_gl_surface_Destroy(p_sys->gl);
return VLC_EGENERIC;
}
/**
* Close the module.
* @param p_this: the filter object
*/
static void Close(filter_t *p_filter)
{
filter_sys_t *p_sys = p_filter->p_sys;
/* Terminate the thread. */
vlc_queue_Kill(&p_sys->queue, &p_sys->dead);
vlc_join(p_sys->thread, NULL);
/* Free the resources */
vlc_gl_surface_Destroy(p_sys->gl);
free(p_sys->p_prev_s16_buff);
}
/**
* Do the actual work with the new sample.
* @param p_filter: filter object
* @param p_in_buf: input buffer
*/
static block_t *DoWork(filter_t *p_filter, block_t *p_in_buf)
{
filter_sys_t *p_sys = p_filter->p_sys;
vlc_queue_Enqueue(&p_sys->queue, block_Duplicate(p_in_buf));
return p_in_buf;
}
/**
* Init the OpenGL scene.
**/
static void initOpenGLScene(filter_t *p_filter)
{
filter_sys_t *p_sys = p_filter->p_sys;
struct glspectrum_opengl_vtable *vt = &p_sys->vt;
vt->Enable(GL_CULL_FACE);
vt->Enable(GL_DEPTH_TEST);
vt->DepthMask(GL_TRUE);
vt->MatrixMode(GL_PROJECTION);
vt->Frustum(-1.0f, 1.0f, -1.0f, 1.0f, 0.5f, 10.0f);
vt->MatrixMode(GL_MODELVIEW);
vt->Translatef(0.0, -2.0, -2.0);
// Init the light.
vt->Enable(GL_LIGHTING);
vt->ColorMaterial(GL_FRONT, GL_AMBIENT_AND_DIFFUSE);
vt->Enable(GL_COLOR_MATERIAL);
vt->Enable(GL_LIGHT0);
vt->Lightfv(GL_LIGHT0, GL_DIFFUSE, lightZeroColor);
vt->Lightfv(GL_LIGHT0, GL_POSITION, lightZeroPosition);
vt->ShadeModel(GL_SMOOTH);
vt->Enable(GL_BLEND);
vt->BlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
}
/**
* Draw one bar of the Spectrum.
*/
static void drawBar(filter_t *p_filter)
{
filter_sys_t *p_sys = p_filter->p_sys;
struct glspectrum_opengl_vtable *vt = &p_sys->vt;
const float w = SPECTRUM_WIDTH / NB_BANDS - 0.05f;
const GLfloat vertexCoords[] = {
0.f, 0.f, 0.f, w, 0.f, 0.f, 0.f, 1.f, 0.f,
0.f, 1.f, 0.f, w, 0.f, 0.f, w, 1.f, 0.f,
0.f, 0.f, -w, 0.f, 0.f, 0.f, 0.f, 1.f, -w,
0.f, 1.f, -w, 0.f, 0.f, 0.f, 0.f, 1.f, 0.f,
w, 0.f, 0.f, w, 0.f, -w, w, 1.f, 0.f,
w, 1.f, 0.f, w, 0.f, -w, w, 1.f, -w,
w, 0.f, -w, 0.f, 0.f, -w, 0.f, 1.f, -w,
0.f, 1.f, -w, w, 1.f, -w, w, 0.f, -w,
0.f, 1.f, 0.f, w, 1.f, 0.f, w, 1.f, -w,
0.f, 1.f, 0.f, w, 1.f, -w, 0.f, 1.f, -w,
};
const GLfloat normals[] = {
0.f, 0.f, 1.f, 0.f, 0.f, 1.f, 0.f, 0.f, 1.f,
0.f, 0.f, 1.f, 0.f, 0.f, 1.f, 0.f, 0.f, 1.f,
-1.f, 0.f, 0.f, -1.f, 0.f, 0.f, -1.f, 0.f, 0.f,
-1.f, 0.f, 0.f, -1.f, 0.f, 0.f, -1.f, 0.f, 0.f,
1.f, 0.f, 0.f, 1.f, 0.f, 0.f, 1.f, 0.f, 0.f,
1.f, 0.f, 0.f, 1.f, 0.f, 0.f, 1.f, 0.f, 0.f,
0.f, 0.f, -1.f, 0.f, 0.f, -1.f, 0.f, 0.f, -1.f,
0.f, 0.f, -1.f, 0.f, 0.f, -1.f, 0.f, 0.f, -1.f,
0.f, 1.f, 0.f, 0.f, 1.f, 0.f, 0.f, 1.f, 0.f,
0.f, 1.f, 0.f, 0.f, 1.f, 0.f, 0.f, 1.f, 0.f,
};
vt->VertexPointer(3, GL_FLOAT, 0, vertexCoords);
vt->NormalPointer(GL_FLOAT, 0, normals);
vt->DrawArrays(GL_TRIANGLES, 0, 6 * 5);
}
/**
* Set the color of one bar of the spectrum.
* @param f_height the height of the bar.
*/
static void setBarColor(filter_t *p_filter, float f_height)
{
filter_sys_t *p_sys = p_filter->p_sys;
struct glspectrum_opengl_vtable *vt = &p_sys->vt;
float r, b;
#define BAR_MAX_HEIGHT 4.2f
r = -1.f + 2 / BAR_MAX_HEIGHT * f_height;
b = 2.f - 2 / BAR_MAX_HEIGHT * f_height;
#undef BAR_MAX_HEIGHT
/* Test the ranges. */
r = r > 1.f ? 1.f : r;
b = b > 1.f ? 1.f : b;
r = r < 0.f ? 0.f : r;
b = b < 0.f ? 0.f : b;
/* Set the bar color. */
vt->Color4f(r, 0.f, b, 1.f);
}
/**
* Draw all the bars of the spectrum.
* @param heights the heights of all the bars.
*/
static void drawBars(filter_t *p_filter, float heights[])
{
filter_sys_t *p_sys = p_filter->p_sys;
struct glspectrum_opengl_vtable *vt = &p_sys->vt;
vt->PushMatrix();
vt->Translatef(-2.f, 0.f, 0.f);
vt->EnableClientState(GL_VERTEX_ARRAY);
vt->EnableClientState(GL_NORMAL_ARRAY);
float w = SPECTRUM_WIDTH / NB_BANDS;
for (unsigned i = 0; i < NB_BANDS; ++i)
{
vt->PushMatrix();
vt->Scalef(1.f, heights[i], 1.f);
setBarColor(p_filter, heights[i]);
drawBar(p_filter);
vt->PopMatrix();
vt->Translatef(w, 0.f, 0.f);
}
vt->DisableClientState(GL_VERTEX_ARRAY);
vt->DisableClientState(GL_NORMAL_ARRAY);
vt->PopMatrix();
}
/**
* Update thread which do the rendering
* @param p_this: the p_thread object
*/
static void *Thread( void *p_data )
{
vlc_thread_set_name("vlc-glspectrum");
filter_t *p_filter = (filter_t*)p_data;
filter_sys_t *p_sys = p_filter->p_sys;
vlc_gl_t *gl = p_sys->gl;
block_t *block;
if (vlc_gl_MakeCurrent(gl) != VLC_SUCCESS)
{
msg_Err(p_filter, "Can't attach gl context");
return NULL;
}
struct glspectrum_opengl_vtable *vt = &p_sys->vt;
initOpenGLScene(p_filter);
float height[NB_BANDS] = {0};
while ((block = vlc_queue_DequeueKillable(&p_sys->queue, &p_sys->dead)))
{
unsigned win_width, win_height;
if (vlc_gl_surface_CheckSize(gl, &win_width, &win_height))
vt->Viewport(0, 0, win_width, win_height);
/* Horizontal scale for 20-band equalizer */
const unsigned xscale[] = {0,1,2,3,4,5,6,7,8,11,15,20,27,
36,47,62,82,107,141,184,255};
fft_state *p_state = NULL; /* internal FFT data */
DEFINE_WIND_CONTEXT(wind_ctx); /* internal window data */
unsigned i, j;
float p_output[FFT_BUFFER_SIZE]; /* Raw FFT Result */
int16_t p_buffer1[FFT_BUFFER_SIZE]; /* Buffer on which we perform
the FFT (first channel) */
int16_t p_dest[FFT_BUFFER_SIZE]; /* Adapted FFT result */
float *p_buffl = (float*)block->p_buffer; /* Original buffer */
int16_t *p_buffs; /* int16_t converted buffer */
int16_t *p_s16_buff; /* int16_t converted buffer */
if (!block->i_nb_samples) {
msg_Err(p_filter, "no samples yet");
goto release;
}
/* Allocate the buffer only if the number of samples change */
if (block->i_nb_samples != p_sys->i_prev_nb_samples)
{
free(p_sys->p_prev_s16_buff);
p_sys->p_prev_s16_buff = malloc(block->i_nb_samples *
p_sys->i_channels *
sizeof(int16_t));
if (!p_sys->p_prev_s16_buff)
goto release;
p_sys->i_prev_nb_samples = block->i_nb_samples;
}
p_buffs = p_s16_buff = p_sys->p_prev_s16_buff;
/* Convert the buffer to int16_t
Pasted from float32tos16.c */
for (i = block->i_nb_samples * p_sys->i_channels; i--;)
{
union {float f; int32_t i;} u;
u.f = *p_buffl + 384.f;
if (u.i > 0x43c07fff)
*p_buffs = 32767;
else if (u.i < 0x43bf8000)
*p_buffs = -32768;
else
*p_buffs = u.i - 0x43c00000;
p_buffl++; p_buffs++;
}
p_state = visual_fft_init();
if (!p_state)
{
msg_Err(p_filter,"unable to initialize FFT transform");
goto release;
}
if (!window_init(FFT_BUFFER_SIZE, &p_sys->wind_param, &wind_ctx))
{
msg_Err(p_filter,"unable to initialize FFT window");
goto release;
}
p_buffs = p_s16_buff;
for (i = 0 ; i < FFT_BUFFER_SIZE; i++)
{
p_output[i] = 0;
p_buffer1[i] = *p_buffs;
p_buffs += p_sys->i_channels;
if (p_buffs >= &p_s16_buff[block->i_nb_samples * p_sys->i_channels])
p_buffs = p_s16_buff;
}
window_scale_in_place (p_buffer1, &wind_ctx);
fft_perform (p_buffer1, p_output, p_state);
for (i = 0; i< FFT_BUFFER_SIZE; ++i)
p_dest[i] = p_output[i] * (2 ^ 16)
/ ((FFT_BUFFER_SIZE / 2 * 32768) ^ 2);
for (i = 0 ; i < NB_BANDS; i++)
{
/* Decrease the previous size of the bar. */
height[i] -= BAR_DECREMENT;
if (height[i] < 0)
height[i] = 0;
int y = 0;
/* We search the maximum on one scale
to determine the current size of the bar. */
for (j = xscale[i]; j < xscale[i + 1]; j++)
{
if (p_dest[j] > y)
y = p_dest[j];
}
/* Calculate the height of the bar */
float new_height = y != 0 ? logf(y) * 0.4f : 0;
height[i] = new_height > height[i]
? new_height : height[i];
}
/* Determine the camera rotation angle. */
p_sys->f_rotationAngle += p_sys->f_rotationIncrement;
if (p_sys->f_rotationAngle <= -ROTATION_MAX)
p_sys->f_rotationIncrement = ROTATION_INCREMENT;
else if (p_sys->f_rotationAngle >= ROTATION_MAX)
p_sys->f_rotationIncrement = -ROTATION_INCREMENT;
/* Render the frame. */
vt->Clear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
vt->PushMatrix();
vt->Rotatef(p_sys->f_rotationAngle, 0, 1, 0);
drawBars(p_filter, height);
vt->PopMatrix();
/* Wait to swapp the frame on time. */
vlc_tick_wait(block->i_pts + (block->i_length / 2));
vlc_gl_Swap(gl);
release:
window_close(&wind_ctx);
fft_close(p_state);
block_Release(block);
}
vlc_gl_ReleaseCurrent(gl);
return NULL;
}