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gstreamer/gst/audiovisualizers/gstbaseaudiovisualizer.c
Stefan Kost 008fa0770b basevisualizer: add more shader variants and simplify code 
Use macros to simplyfy the shading code. Those will ease to add support for
other colorspaces in the future. Add more variants for the shading (left,right,
horiz-in, vert-out, vert-in).
2011-08-12 22:39:53 +02:00

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/* GStreamer
* Copyright (C) <2011> Stefan Kost <ensonic@users.sf.net>
*
* gstbaseaudiovisualizer.h: base class for audio visualisation elements
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
/**
* SECTION:gstbaseaudiovisualizer
*
* A basclass for scopes (visualizers). It takes care of re-fitting the
* audio-rate to video-rate and handles renegotiation (downstream video size
* changes).
*
* It also provides several background shading effects. These effects are
* applied to a previous picture before the render() implementation can draw a
* new frame.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include <gst/controller/gstcontroller.h>
#include "gstbaseaudiovisualizer.h"
GST_DEBUG_CATEGORY_STATIC (base_audio_visualizer_debug);
#define GST_CAT_DEFAULT (base_audio_visualizer_debug)
#define DEFAULT_SHADER GST_BASE_AUDIO_VISUALIZER_SHADER_FADE
#define DEFAULT_SHADE_AMOUNT 0x000a0a0a
enum
{
PROP_0,
PROP_SHADER,
PROP_SHADE_AMOUNT
};
static GstBaseTransformClass *parent_class = NULL;
static void gst_base_audio_visualizer_class_init (GstBaseAudioVisualizerClass *
klass);
static void gst_base_audio_visualizer_init (GstBaseAudioVisualizer * scope,
GstBaseAudioVisualizerClass * g_class);
static void gst_base_audio_visualizer_set_property (GObject * object,
guint prop_id, const GValue * value, GParamSpec * pspec);
static void gst_base_audio_visualizer_get_property (GObject * object,
guint prop_id, GValue * value, GParamSpec * pspec);
static void gst_base_audio_visualizer_dispose (GObject * object);
static gboolean gst_base_audio_visualizer_src_negotiate (GstBaseAudioVisualizer
* scope);
static gboolean gst_base_audio_visualizer_src_setcaps (GstPad * pad,
GstCaps * caps);
static gboolean gst_base_audio_visualizer_sink_setcaps (GstPad * pad,
GstCaps * caps);
static GstFlowReturn gst_base_audio_visualizer_chain (GstPad * pad,
GstBuffer * buffer);
static GstStateChangeReturn gst_base_audio_visualizer_change_state (GstElement *
element, GstStateChange transition);
/* shading functions */
#define GST_TYPE_BASE_AUDIO_VISUALIZER_SHADER (gst_base_audio_visualizer_shader_get_type())
static GType
gst_base_audio_visualizer_shader_get_type (void)
{
static GType shader_type = 0;
static const GEnumValue shaders[] = {
{GST_BASE_AUDIO_VISUALIZER_SHADER_NONE, "None", "none"},
{GST_BASE_AUDIO_VISUALIZER_SHADER_FADE, "Fade", "fade"},
{GST_BASE_AUDIO_VISUALIZER_SHADER_FADE_AND_MOVE_UP, "Fade and move up",
"fade-and-move-up"},
{GST_BASE_AUDIO_VISUALIZER_SHADER_FADE_AND_MOVE_DOWN, "Fade and move down",
"fade-and-move-down"},
{GST_BASE_AUDIO_VISUALIZER_SHADER_FADE_AND_MOVE_LEFT, "Fade and move left",
"fade-and-move-left"},
{GST_BASE_AUDIO_VISUALIZER_SHADER_FADE_AND_MOVE_RIGHT,
"Fade and move right",
"fade-and-move-right"},
{GST_BASE_AUDIO_VISUALIZER_SHADER_FADE_AND_MOVE_HORIZ_OUT,
"Fade and move horizontally out", "fade-and-move-horiz-out"},
{GST_BASE_AUDIO_VISUALIZER_SHADER_FADE_AND_MOVE_HORIZ_IN,
"Fade and move horizontally in", "fade-and-move-horiz-in"},
{GST_BASE_AUDIO_VISUALIZER_SHADER_FADE_AND_MOVE_VERT_OUT,
"Fade and move vertically out", "fade-and-move-vert-out"},
{GST_BASE_AUDIO_VISUALIZER_SHADER_FADE_AND_MOVE_VERT_IN,
"Fade and move vertically in", "fade-and-move-vert-in"},
{0, NULL, NULL},
};
if (G_UNLIKELY (shader_type == 0)) {
shader_type =
g_enum_register_static ("GstBaseAudioVisualizerShader", shaders);
}
return shader_type;
}
/* we're only supporting GST_VIDEO_FORMAT_xRGB right now) */
#if G_BYTE_ORDER == G_LITTLE_ENDIAN
#define SHADE1(_d, _s, _i, _r, _g, _b) \
G_STMT_START { \
_d[_i] = (_s[_i] > _b) ? _s[_i] - _b : 0; \
_i++; \
_d[_i] = (_s[_i] > _g) ? _s[_i] - _g : 0; \
_i++; \
_d[_i] = (_s[_i] > _r) ? _s[_i] - _r : 0; \
_i++; \
_d[_i++] = 0; \
} G_STMT_END
#define SHADE2(_d, _s, _j, _i, _r, _g, _b) \
G_STMT_START { \
_d[_j++] = (_s[_i] > _b) ? _s[_i] - _b : 0; \
_i++; \
_d[_j++] = (_s[_i] > _g) ? _s[_i] - _g : 0; \
_i++; \
_d[_j++] = (_s[_i] > _r) ? _s[_i] - _r : 0; \
_i++; \
_d[_j++] = 0; \
_i++; \
} G_STMT_END
#else
#define SHADE1(_d, _s, _i, _r, _g, _b) \
G_STMT_START { \
_d[_i++] = 0; \
_d[_i] = (_s[_i] > _r) ? _s[_i] - _r : 0; \
_i++; \
_d[_i] = (_s[_i] > _g) ? _s[_i] - _g : 0; \
_i++; \
_d[_i] = (_s[_i] > _b) ? _s[_i] - _b : 0; \
_i++; \
} G_STMT_END
#define SHADE2(_d, _s, _j, _i, _r, _g, _b) \
G_STMT_START { \
_d[_j++] = 0; \
_i++; \
_d[_j++] = (_s[_i] > _r) ? _s[_i] - _r : 0; \
_i++; \
_d[_j++] = (_s[_i] > _g) ? _s[_i] - _g : 0; \
_i++; \
_d[_j++] = (_s[_i] > _b) ? _s[_i] - _b : 0; \
_i++; \
} G_STMT_END
#endif
static void
shader_fade (GstBaseAudioVisualizer * scope, const guint8 * s, guint8 * d)
{
guint i, bpf = scope->bpf;
guint r = (scope->shade_amount >> 16) & 0xff;
guint g = (scope->shade_amount >> 8) & 0xff;
guint b = (scope->shade_amount >> 0) & 0xff;
for (i = 0; i < bpf;) {
SHADE1 (d, s, i, r, g, b);
}
}
static void
shader_fade_and_move_up (GstBaseAudioVisualizer * scope, const guint8 * s,
guint8 * d)
{
guint i, j, bpf = scope->bpf;
guint bpl = 4 * scope->width;
guint r = (scope->shade_amount >> 16) & 0xff;
guint g = (scope->shade_amount >> 8) & 0xff;
guint b = (scope->shade_amount >> 0) & 0xff;
for (j = 0, i = bpl; i < bpf;) {
SHADE2 (d, s, j, i, r, g, b);
}
}
static void
shader_fade_and_move_down (GstBaseAudioVisualizer * scope, const guint8 * s,
guint8 * d)
{
guint i, j, bpf = scope->bpf;
guint bpl = 4 * scope->width;
guint r = (scope->shade_amount >> 16) & 0xff;
guint g = (scope->shade_amount >> 8) & 0xff;
guint b = (scope->shade_amount >> 0) & 0xff;
for (j = bpl, i = 0; j < bpf;) {
SHADE2 (d, s, j, i, r, g, b);
}
}
static void
shader_fade_and_move_left (GstBaseAudioVisualizer * scope,
const guint8 * s, guint8 * d)
{
guint i, j, k, bpf = scope->bpf;
guint w = scope->width;
guint r = (scope->shade_amount >> 16) & 0xff;
guint g = (scope->shade_amount >> 8) & 0xff;
guint b = (scope->shade_amount >> 0) & 0xff;
/* move to the left */
for (j = 0, i = 4; i < bpf;) {
for (k = 0; k < w - 1; k++) {
SHADE2 (d, s, j, i, r, g, b);
}
i += 4;
j += 4;
}
}
static void
shader_fade_and_move_right (GstBaseAudioVisualizer * scope,
const guint8 * s, guint8 * d)
{
guint i, j, k, bpf = scope->bpf;
guint w = scope->width;
guint r = (scope->shade_amount >> 16) & 0xff;
guint g = (scope->shade_amount >> 8) & 0xff;
guint b = (scope->shade_amount >> 0) & 0xff;
/* move to the left */
for (j = 4, i = 0; i < bpf;) {
for (k = 0; k < w - 1; k++) {
SHADE2 (d, s, j, i, r, g, b);
}
i += 4;
j += 4;
}
}
static void
shader_fade_and_move_horiz_out (GstBaseAudioVisualizer * scope,
const guint8 * s, guint8 * d)
{
guint i, j, bpf = scope->bpf / 2;
guint bpl = 4 * scope->width;
guint r = (scope->shade_amount >> 16) & 0xff;
guint g = (scope->shade_amount >> 8) & 0xff;
guint b = (scope->shade_amount >> 0) & 0xff;
/* move upper half up */
for (j = 0, i = bpl; i < bpf;) {
SHADE2 (d, s, j, i, r, g, b);
}
/* move lower half down */
for (j = bpf + bpl, i = bpf; j < bpf + bpf;) {
SHADE2 (d, s, j, i, r, g, b);
}
}
static void
shader_fade_and_move_horiz_in (GstBaseAudioVisualizer * scope,
const guint8 * s, guint8 * d)
{
guint i, j, bpf = scope->bpf / 2;
guint bpl = 4 * scope->width;
guint r = (scope->shade_amount >> 16) & 0xff;
guint g = (scope->shade_amount >> 8) & 0xff;
guint b = (scope->shade_amount >> 0) & 0xff;
/* move upper half down */
for (i = 0, j = bpl; i < bpf;) {
SHADE2 (d, s, j, i, r, g, b);
}
/* move lower half up */
for (i = bpf + bpl, j = bpf; i < bpf + bpf;) {
SHADE2 (d, s, j, i, r, g, b);
}
}
static void
shader_fade_and_move_vert_out (GstBaseAudioVisualizer * scope,
const guint8 * s, guint8 * d)
{
guint i, j, k, bpf = scope->bpf;
guint m = scope->width / 2;
guint r = (scope->shade_amount >> 16) & 0xff;
guint g = (scope->shade_amount >> 8) & 0xff;
guint b = (scope->shade_amount >> 0) & 0xff;
/* move left half to the left */
for (j = 0, i = 4; i < bpf;) {
for (k = 0; k < m; k++) {
SHADE2 (d, s, j, i, r, g, b);
}
j += 4 * m;
i += 4 * m;
}
/* move right half to the right */
for (j = 4 * (m + 1), i = 4 * m; j < bpf;) {
for (k = 0; k < m; k++) {
SHADE2 (d, s, j, i, r, g, b);
}
j += 4 * m;
i += 4 * m;
}
}
static void
shader_fade_and_move_vert_in (GstBaseAudioVisualizer * scope,
const guint8 * s, guint8 * d)
{
guint i, j, k, bpf = scope->bpf;
guint m = scope->width / 2;
guint r = (scope->shade_amount >> 16) & 0xff;
guint g = (scope->shade_amount >> 8) & 0xff;
guint b = (scope->shade_amount >> 0) & 0xff;
/* move left half to the right */
for (j = 4, i = 0; j < bpf;) {
for (k = 0; k < m; k++) {
SHADE2 (d, s, j, i, r, g, b);
}
j += 4 * m;
i += 4 * m;
}
/* move right half to the left */
for (j = 4 * m, i = 4 * (m + 1); i < bpf;) {
for (k = 0; k < m; k++) {
SHADE2 (d, s, j, i, r, g, b);
}
j += 4 * m;
i += 4 * m;
}
}
static void
gst_base_audio_visualizer_change_shader (GstBaseAudioVisualizer * scope)
{
switch (scope->shader_type) {
case GST_BASE_AUDIO_VISUALIZER_SHADER_NONE:
scope->shader = NULL;
break;
case GST_BASE_AUDIO_VISUALIZER_SHADER_FADE:
scope->shader = shader_fade;
break;
case GST_BASE_AUDIO_VISUALIZER_SHADER_FADE_AND_MOVE_UP:
scope->shader = shader_fade_and_move_up;
break;
case GST_BASE_AUDIO_VISUALIZER_SHADER_FADE_AND_MOVE_DOWN:
scope->shader = shader_fade_and_move_down;
break;
case GST_BASE_AUDIO_VISUALIZER_SHADER_FADE_AND_MOVE_LEFT:
scope->shader = shader_fade_and_move_left;
break;
case GST_BASE_AUDIO_VISUALIZER_SHADER_FADE_AND_MOVE_RIGHT:
scope->shader = shader_fade_and_move_right;
break;
case GST_BASE_AUDIO_VISUALIZER_SHADER_FADE_AND_MOVE_HORIZ_OUT:
scope->shader = shader_fade_and_move_horiz_out;
break;
case GST_BASE_AUDIO_VISUALIZER_SHADER_FADE_AND_MOVE_HORIZ_IN:
scope->shader = shader_fade_and_move_horiz_in;
break;
case GST_BASE_AUDIO_VISUALIZER_SHADER_FADE_AND_MOVE_VERT_OUT:
scope->shader = shader_fade_and_move_vert_out;
break;
case GST_BASE_AUDIO_VISUALIZER_SHADER_FADE_AND_MOVE_VERT_IN:
scope->shader = shader_fade_and_move_vert_in;
break;
default:
GST_ERROR ("invalid shader function");
scope->shader = NULL;
break;
}
}
/* base class */
GType
gst_base_audio_visualizer_get_type (void)
{
static volatile gsize base_audio_visualizer_type = 0;
if (g_once_init_enter (&base_audio_visualizer_type)) {
static const GTypeInfo base_audio_visualizer_info = {
sizeof (GstBaseAudioVisualizerClass),
NULL,
NULL,
(GClassInitFunc) gst_base_audio_visualizer_class_init,
NULL,
NULL,
sizeof (GstBaseAudioVisualizer),
0,
(GInstanceInitFunc) gst_base_audio_visualizer_init,
};
GType _type;
_type = g_type_register_static (GST_TYPE_ELEMENT,
"GstBaseAudioVisualizer", &base_audio_visualizer_info,
G_TYPE_FLAG_ABSTRACT);
g_once_init_leave (&base_audio_visualizer_type, _type);
}
return (GType) base_audio_visualizer_type;
}
static void
gst_base_audio_visualizer_class_init (GstBaseAudioVisualizerClass * klass)
{
GObjectClass *gobject_class = (GObjectClass *) klass;
GstElementClass *element_class = (GstElementClass *) klass;
parent_class = g_type_class_peek_parent (klass);
GST_DEBUG_CATEGORY_INIT (base_audio_visualizer_debug, "baseaudiovisualizer",
0, "scope audio visualisation base class");
gobject_class->set_property = gst_base_audio_visualizer_set_property;
gobject_class->get_property = gst_base_audio_visualizer_get_property;
gobject_class->dispose = gst_base_audio_visualizer_dispose;
element_class->change_state =
GST_DEBUG_FUNCPTR (gst_base_audio_visualizer_change_state);
g_object_class_install_property (gobject_class, PROP_SHADER,
g_param_spec_enum ("shader", "shader type",
"Shader function to apply on each frame",
GST_TYPE_BASE_AUDIO_VISUALIZER_SHADER, DEFAULT_SHADER,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_SHADE_AMOUNT,
g_param_spec_uint ("shade-amount", "shade amount",
"Shading color to use (big-endian ARGB)", 0, G_MAXUINT32,
DEFAULT_SHADE_AMOUNT,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
}
static void
gst_base_audio_visualizer_init (GstBaseAudioVisualizer * scope,
GstBaseAudioVisualizerClass * g_class)
{
GstPadTemplate *pad_template;
/* create the sink and src pads */
pad_template =
gst_element_class_get_pad_template (GST_ELEMENT_CLASS (g_class), "sink");
g_return_if_fail (pad_template != NULL);
scope->sinkpad = gst_pad_new_from_template (pad_template, "sink");
gst_pad_set_chain_function (scope->sinkpad,
GST_DEBUG_FUNCPTR (gst_base_audio_visualizer_chain));
gst_pad_set_setcaps_function (scope->sinkpad,
GST_DEBUG_FUNCPTR (gst_base_audio_visualizer_sink_setcaps));
gst_element_add_pad (GST_ELEMENT (scope), scope->sinkpad);
pad_template =
gst_element_class_get_pad_template (GST_ELEMENT_CLASS (g_class), "src");
g_return_if_fail (pad_template != NULL);
scope->srcpad = gst_pad_new_from_template (pad_template, "src");
gst_pad_set_setcaps_function (scope->srcpad,
GST_DEBUG_FUNCPTR (gst_base_audio_visualizer_src_setcaps));
gst_element_add_pad (GST_ELEMENT (scope), scope->srcpad);
scope->adapter = gst_adapter_new ();
scope->inbuf = gst_buffer_new ();
/* properties */
scope->shader_type = DEFAULT_SHADER;
gst_base_audio_visualizer_change_shader (scope);
scope->shade_amount = DEFAULT_SHADE_AMOUNT;
/* reset the initial video state */
scope->width = 320;
scope->height = 200;
scope->fps_n = 25; /* desired frame rate */
scope->fps_d = 1;
scope->frame_duration = GST_CLOCK_TIME_NONE;
/* reset the initial audio state */
scope->rate = GST_AUDIO_DEF_RATE;
scope->channels = 2;
scope->next_ts = GST_CLOCK_TIME_NONE;
scope->config_lock = g_mutex_new ();
}
static void
gst_base_audio_visualizer_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstBaseAudioVisualizer *scope = GST_BASE_AUDIO_VISUALIZER (object);
switch (prop_id) {
case PROP_SHADER:
scope->shader_type = g_value_get_enum (value);
gst_base_audio_visualizer_change_shader (scope);
break;
case PROP_SHADE_AMOUNT:
scope->shade_amount = g_value_get_uint (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_base_audio_visualizer_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstBaseAudioVisualizer *scope = GST_BASE_AUDIO_VISUALIZER (object);
switch (prop_id) {
case PROP_SHADER:
g_value_set_enum (value, scope->shader_type);
break;
case PROP_SHADE_AMOUNT:
g_value_set_uint (value, scope->shade_amount);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_base_audio_visualizer_dispose (GObject * object)
{
GstBaseAudioVisualizer *scope = GST_BASE_AUDIO_VISUALIZER (object);
if (scope->adapter) {
g_object_unref (scope->adapter);
scope->adapter = NULL;
}
if (scope->inbuf) {
gst_buffer_unref (scope->inbuf);
scope->inbuf = NULL;
}
if (scope->pixelbuf) {
g_free (scope->pixelbuf);
scope->pixelbuf = NULL;
}
if (scope->config_lock) {
g_mutex_free (scope->config_lock);
scope->config_lock = NULL;
}
G_OBJECT_CLASS (parent_class)->dispose (object);
}
static gboolean
gst_base_audio_visualizer_sink_setcaps (GstPad * pad, GstCaps * caps)
{
GstBaseAudioVisualizer *scope;
GstStructure *structure;
gint channels;
gint rate;
gboolean res = TRUE;
scope = GST_BASE_AUDIO_VISUALIZER (gst_pad_get_parent (pad));
structure = gst_caps_get_structure (caps, 0);
if (!gst_structure_get_int (structure, "channels", &channels) ||
!gst_structure_get_int (structure, "rate", &rate))
goto missing_caps_details;
if (channels != 2)
goto wrong_channels;
if (rate <= 0)
goto wrong_rate;
scope->channels = channels;
scope->rate = rate;
GST_DEBUG_OBJECT (scope, "audio: channels %d, rate %d",
scope->channels, scope->rate);
done:
gst_object_unref (scope);
return res;
/* Errors */
missing_caps_details:
{
GST_WARNING_OBJECT (scope, "missing channels or rate in the caps");
res = FALSE;
goto done;
}
wrong_channels:
{
GST_WARNING_OBJECT (scope, "number of channels must be 2, but is %d",
channels);
res = FALSE;
goto done;
}
wrong_rate:
{
GST_WARNING_OBJECT (scope, "sample rate must be >0, but is %d", rate);
res = FALSE;
goto done;
}
}
static gboolean
gst_base_audio_visualizer_src_negotiate (GstBaseAudioVisualizer * scope)
{
GstCaps *othercaps, *target, *intersect;
GstStructure *structure;
const GstCaps *templ;
templ = gst_pad_get_pad_template_caps (scope->srcpad);
GST_DEBUG_OBJECT (scope, "performing negotiation");
/* see what the peer can do */
othercaps = gst_pad_peer_get_caps (scope->srcpad);
if (othercaps) {
intersect = gst_caps_intersect (othercaps, templ);
gst_caps_unref (othercaps);
if (gst_caps_is_empty (intersect))
goto no_format;
target = gst_caps_copy_nth (intersect, 0);
gst_caps_unref (intersect);
} else {
target = gst_caps_ref ((GstCaps *) templ);
}
structure = gst_caps_get_structure (target, 0);
gst_structure_fixate_field_nearest_int (structure, "width", scope->width);
gst_structure_fixate_field_nearest_int (structure, "height", scope->height);
gst_structure_fixate_field_nearest_fraction (structure, "framerate",
scope->fps_n, scope->fps_d);
GST_DEBUG_OBJECT (scope, "final caps are %" GST_PTR_FORMAT, target);
gst_pad_set_caps (scope->srcpad, target);
gst_caps_unref (target);
return TRUE;
no_format:
{
gst_caps_unref (intersect);
return FALSE;
}
}
static gboolean
gst_base_audio_visualizer_src_setcaps (GstPad * pad, GstCaps * caps)
{
GstBaseAudioVisualizer *scope;
GstBaseAudioVisualizerClass *klass;
gint w, h;
gint num, denom;
GstVideoFormat format;
gboolean res = TRUE;
scope = GST_BASE_AUDIO_VISUALIZER (gst_pad_get_parent (pad));
klass = GST_BASE_AUDIO_VISUALIZER_CLASS (G_OBJECT_GET_CLASS (scope));
if (!gst_video_format_parse_caps (caps, &format, &w, &h)) {
goto missing_caps_details;
}
if (!gst_video_parse_caps_framerate (caps, &num, &denom)) {
goto missing_caps_details;
}
g_mutex_lock (scope->config_lock);
scope->width = w;
scope->height = h;
scope->fps_n = num;
scope->fps_d = denom;
scope->video_format = format;
scope->frame_duration = gst_util_uint64_scale_int (GST_SECOND,
scope->fps_d, scope->fps_n);
scope->spf = gst_util_uint64_scale_int (scope->rate,
scope->fps_d, scope->fps_n);
scope->req_spf = scope->spf;
scope->bpf = w * h * 4;
if (scope->pixelbuf)
g_free (scope->pixelbuf);
scope->pixelbuf = g_malloc0 (scope->bpf);
if (klass->setup)
res = klass->setup (scope);
GST_DEBUG_OBJECT (scope, "video: dimension %dx%d, framerate %d/%d",
scope->width, scope->height, scope->fps_n, scope->fps_d);
GST_DEBUG_OBJECT (scope, "blocks: spf %u, req_spf %u",
scope->spf, scope->req_spf);
g_mutex_unlock (scope->config_lock);
done:
gst_object_unref (scope);
return res;
/* Errors */
missing_caps_details:
{
GST_WARNING_OBJECT (scope,
"missing width, height or framerate in the caps");
res = FALSE;
goto done;
}
}
static GstFlowReturn
gst_base_audio_visualizer_chain (GstPad * pad, GstBuffer * buffer)
{
GstFlowReturn ret = GST_FLOW_OK;
GstBaseAudioVisualizer *scope;
GstBaseAudioVisualizerClass *klass;
GstBuffer *inbuf;
guint avail, sbpf;
guint8 *adata;
gboolean (*render) (GstBaseAudioVisualizer * scope, GstBuffer * audio,
GstBuffer * video);
scope = GST_BASE_AUDIO_VISUALIZER (gst_pad_get_parent (pad));
klass = GST_BASE_AUDIO_VISUALIZER_CLASS (G_OBJECT_GET_CLASS (scope));
render = klass->render;
GST_LOG_OBJECT (scope, "chainfunc called");
/* resync on DISCONT */
if (GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DISCONT)) {
scope->next_ts = GST_CLOCK_TIME_NONE;
gst_adapter_clear (scope->adapter);
}
if (GST_PAD_CAPS (scope->srcpad) == NULL) {
if (!gst_base_audio_visualizer_src_negotiate (scope))
return GST_FLOW_NOT_NEGOTIATED;
}
/* Match timestamps from the incoming audio */
if (GST_BUFFER_TIMESTAMP (buffer) != GST_CLOCK_TIME_NONE)
scope->next_ts = GST_BUFFER_TIMESTAMP (buffer);
gst_adapter_push (scope->adapter, buffer);
g_mutex_lock (scope->config_lock);
/* this is what we want */
sbpf = scope->req_spf * scope->channels * sizeof (gint16);
inbuf = scope->inbuf;
/* FIXME: the timestamp in the adapter would be different */
gst_buffer_copy_metadata (inbuf, buffer, GST_BUFFER_COPY_ALL);
/* this is what we have */
avail = gst_adapter_available (scope->adapter);
GST_LOG_OBJECT (scope, "avail: %u, bpf: %u", avail, sbpf);
while (avail >= sbpf) {
GstBuffer *outbuf;
g_mutex_unlock (scope->config_lock);
ret = gst_pad_alloc_buffer_and_set_caps (scope->srcpad,
GST_BUFFER_OFFSET_NONE,
scope->bpf, GST_PAD_CAPS (scope->srcpad), &outbuf);
g_mutex_lock (scope->config_lock);
/* recheck as the value could have changed */
sbpf = scope->req_spf * scope->channels * sizeof (gint16);
/* no buffer allocated, we don't care why. */
if (ret != GST_FLOW_OK)
break;
/* sync controlled properties */
gst_object_sync_values (G_OBJECT (scope), scope->next_ts);
GST_BUFFER_TIMESTAMP (outbuf) = scope->next_ts;
GST_BUFFER_DURATION (outbuf) = scope->frame_duration;
if (scope->shader) {
memcpy (GST_BUFFER_DATA (outbuf), scope->pixelbuf, scope->bpf);
} else {
memset (GST_BUFFER_DATA (outbuf), 0, scope->bpf);
}
/* this can fail as the data size we need could have changed */
if (!(adata = (guint8 *) gst_adapter_peek (scope->adapter, sbpf)))
break;
GST_BUFFER_DATA (inbuf) = adata;
GST_BUFFER_SIZE (inbuf) = sbpf;
/* call class->render() vmethod */
if (render) {
if (!render (scope, inbuf, outbuf)) {
ret = GST_FLOW_ERROR;
} else {
/* run various post processing (shading and geometri transformation */
if (scope->shader) {
scope->shader (scope, GST_BUFFER_DATA (outbuf), scope->pixelbuf);
}
}
}
g_mutex_unlock (scope->config_lock);
ret = gst_pad_push (scope->srcpad, outbuf);
outbuf = NULL;
g_mutex_lock (scope->config_lock);
/* recheck as the value could have changed */
sbpf = scope->req_spf * scope->channels * sizeof (gint16);
GST_LOG_OBJECT (scope, "avail: %u, bpf: %u", avail, sbpf);
/* we want to take less or more, depending on spf : req_spf */
if (avail - sbpf >= sbpf) {
gst_adapter_flush (scope->adapter, sbpf);
} else if (avail - sbpf >= 0) {
/* just flush a bit and stop */
gst_adapter_flush (scope->adapter, (avail - sbpf));
break;
}
avail = gst_adapter_available (scope->adapter);
if (ret != GST_FLOW_OK)
break;
if (scope->next_ts != GST_CLOCK_TIME_NONE)
scope->next_ts += scope->frame_duration;
}
g_mutex_unlock (scope->config_lock);
gst_object_unref (scope);
return ret;
}
static GstStateChangeReturn
gst_base_audio_visualizer_change_state (GstElement * element,
GstStateChange transition)
{
GstBaseAudioVisualizer *scope;
scope = GST_BASE_AUDIO_VISUALIZER (element);
switch (transition) {
case GST_STATE_CHANGE_READY_TO_PAUSED:
scope->next_ts = GST_CLOCK_TIME_NONE;
gst_adapter_clear (scope->adapter);
break;
default:
break;
}
return GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
}
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