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gstreamer/sys/androidcamera/gstahcsrc.c

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/* GStreamer android.hardware.Camera Source
*
* Copyright (C) 2012, Cisco Systems, Inc.
* Author: Youness Alaoui <youness.alaoui@collabora.co.uk>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <gst/video/video.h>
#include <gst/interfaces/propertyprobe.h>
#include "gstahcsrc.h"
#include "gst-dvm.h"
static void gst_ahc_src_property_probe_interface_init (GstPropertyProbeInterface
* iface);
static void gst_ahc_src_init_interfaces (GType type);
static void gst_ahc_src_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_ahc_src_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static void gst_ahc_src_dispose (GObject * object);
static GstStateChangeReturn gst_ahc_src_change_state (GstElement * element,
GstStateChange transition);
static GstCaps *gst_ahc_src_getcaps (GstBaseSrc * src);
static gboolean gst_ahc_src_setcaps (GstBaseSrc * src, GstCaps * caps);
static void gst_ahc_src_fixate (GstBaseSrc * basesrc, GstCaps * caps);
static gboolean gst_ahc_src_start (GstBaseSrc * bsrc);
static gboolean gst_ahc_src_stop (GstBaseSrc * bsrc);
static gboolean gst_ahc_src_unlock (GstBaseSrc * bsrc);
static gboolean gst_ahc_src_unlock_stop (GstBaseSrc * bsrc);
static GstFlowReturn gst_ahc_src_create (GstPushSrc * src, GstBuffer ** buffer);
static gboolean gst_ahc_src_query (GstBaseSrc * bsrc, GstQuery * query);
static void gst_ahc_src_close (GstAHCSrc * self);
static void gst_ahc_src_on_preview_frame (jbyteArray data, gpointer user_data);
static void gst_ahc_src_on_error (int error, gpointer user_data);
#define NUM_CALLBACK_BUFFERS 5
#define GST_AHC_SRC_CAPS_STR \
GST_VIDEO_CAPS_YUV (" { YV12 , YUY2 , NV21 , NV16 }") ";" \
GST_VIDEO_CAPS_RGB_16
static GstStaticPadTemplate gst_ahc_src_pad_template =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (GST_AHC_SRC_CAPS_STR));
GST_DEBUG_CATEGORY_STATIC (gst_ahc_src_debug);
#define GST_CAT_DEFAULT gst_ahc_src_debug
enum
{
PROP_0,
PROP_DEVICE,
PROP_DEVICE_FACING,
PROP_DEVICE_ORIENTATION,
};
#define DEFAULT_DEVICE "0"
GST_BOILERPLATE_FULL (GstAHCSrc, gst_ahc_src, GstPushSrc, GST_TYPE_PUSH_SRC,
gst_ahc_src_init_interfaces);
#define CAMERA_FACING_BACK 0
#define CAMERA_FACING_FRONT 1
static GType
gst_ahc_src_facing_get_type (void)
{
static GType type = 0;
static const GEnumValue types[] = {
{CAMERA_FACING_BACK, "Back", "back"},
{CAMERA_FACING_FRONT, "Front", "front"},
{0, NULL, NULL}
};
if (!type) {
type = g_enum_register_static ("GstAHCSrcFacing", types);
}
return type;
}
#define GST_AHC_SRC_FACING_TYPE (gst_ahc_src_facing_get_type())
static void
gst_ahc_src_init_interfaces (GType type)
{
static const GInterfaceInfo ahcsrc_propertyprobe_info = {
(GInterfaceInitFunc) gst_ahc_src_property_probe_interface_init,
NULL,
NULL,
};
g_type_add_interface_static (type, GST_TYPE_PROPERTY_PROBE,
&ahcsrc_propertyprobe_info);
}
static void
gst_ahc_src_base_init (gpointer g_class)
{
GstElementClass *gstelement_class = GST_ELEMENT_CLASS (g_class);
GST_DEBUG_CATEGORY_INIT (gst_ahc_src_debug, "ahcsrc", 0,
"android.hardware.Camera source element");
gst_element_class_add_static_pad_template (gstelement_class,
&gst_ahc_src_pad_template);
gst_element_class_set_details_simple (gstelement_class,
"Android Camera Source",
"Source/Video",
"Reads frames from android.hardware.Camera class into buffers",
"Youness Alaoui <youness.alaoui@collabora.co.uk>");
}
static void
gst_ahc_src_class_init (GstAHCSrcClass * klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
GstPushSrcClass *gstpushsrc_class = GST_PUSH_SRC_CLASS (klass);
GstBaseSrcClass *gstbasesrc_class = GST_BASE_SRC_CLASS (klass);
gobject_class->set_property = gst_ahc_src_set_property;
gobject_class->get_property = gst_ahc_src_get_property;
gobject_class->dispose = gst_ahc_src_dispose;
element_class->change_state = gst_ahc_src_change_state;
gstbasesrc_class->get_caps = gst_ahc_src_getcaps;
gstbasesrc_class->set_caps = gst_ahc_src_setcaps;
gstbasesrc_class->fixate = gst_ahc_src_fixate;
gstbasesrc_class->start = gst_ahc_src_start;
gstbasesrc_class->stop = gst_ahc_src_stop;
gstbasesrc_class->unlock = gst_ahc_src_unlock;
gstbasesrc_class->unlock_stop = gst_ahc_src_unlock_stop;
gstbasesrc_class->query = gst_ahc_src_query;
gstpushsrc_class->create = gst_ahc_src_create;
g_object_class_install_property (gobject_class, PROP_DEVICE,
g_param_spec_string ("device", "device",
"Device ID", DEFAULT_DEVICE,
G_PARAM_READWRITE | G_PARAM_CONSTRUCT | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_DEVICE_ORIENTATION,
g_param_spec_int ("device-orientation", "Device orientation",
"The orientation of the camera image",
0, 360, 0, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_DEVICE_FACING,
g_param_spec_enum ("device-facing", "Device facing",
"The direction that the camera faces",
GST_AHC_SRC_FACING_TYPE, CAMERA_FACING_BACK,
G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
klass->probe_properties = NULL;
}
static gboolean
_data_queue_check_full (GstDataQueue * queue, guint visible,
guint bytes, guint64 time, gpointer checkdata)
{
return FALSE;
}
static void
gst_ahc_src_init (GstAHCSrc * self, GstAHCSrcClass * klass)
{
gst_base_src_set_live (GST_BASE_SRC (self), TRUE);
gst_base_src_set_format (GST_BASE_SRC (self), GST_FORMAT_TIME);
gst_base_src_set_do_timestamp (GST_BASE_SRC (self), FALSE);
self->camera = NULL;
self->texture = NULL;
self->data = NULL;
self->queue = gst_data_queue_new (_data_queue_check_full, NULL);
self->start = FALSE;
self->previous_ts = GST_CLOCK_TIME_NONE;
}
static void
gst_ahc_src_dispose (GObject * object)
{
GstAHCSrc *self = GST_AHC_SRC (object);
if (self->queue)
g_object_unref (self->queue);
self->queue = NULL;
G_OBJECT_CLASS (parent_class)->dispose (object);
}
static void
gst_ahc_src_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstAHCSrc *self = GST_AHC_SRC (object);
(void) self;
switch (prop_id) {
case PROP_DEVICE:{
const gchar *dev = g_value_get_string (value);
gchar *endptr = NULL;
guint64 device;
device = g_ascii_strtoll (dev, &endptr, 10);
if (endptr != dev && endptr[0] == 0 && device < G_MAXINT)
self->device = (gint) device;
}
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_ahc_src_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstAHCSrc *self = GST_AHC_SRC (object);
(void) self;
switch (prop_id) {
case PROP_DEVICE:{
gchar *dev = g_strdup_printf ("%d", self->device);
g_value_take_string (value, dev);
}
break;
case PROP_DEVICE_FACING:{
GstAHCCameraInfo info;
if (gst_ah_camera_get_camera_info (self->device, &info))
g_value_set_enum (value, info.facing == CameraInfo_CAMERA_FACING_BACK ?
CAMERA_FACING_BACK : CAMERA_FACING_FRONT);
else
g_value_set_enum (value, CAMERA_FACING_BACK);
}
break;
case PROP_DEVICE_ORIENTATION:{
GstAHCCameraInfo info;
if (gst_ah_camera_get_camera_info (self->device, &info))
g_value_set_int (value, info.orientation);
else
g_value_set_int (value, 0);
}
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static const GList *
gst_ahc_src_probe_get_properties (GstPropertyProbe * probe)
{
GObjectClass *klass = G_OBJECT_GET_CLASS (probe);
GstAHCSrcClass *ahc_class = GST_AHC_SRC_CLASS (probe);
if (!ahc_class->probe_properties)
ahc_class->probe_properties = g_list_append (NULL,
g_object_class_find_property (klass, "device"));
return ahc_class->probe_properties;
}
static GValueArray *
gst_ahc_src_probe_get_values (GstPropertyProbe * probe,
guint prop_id, const GParamSpec * pspec)
{
GValueArray *array = NULL;
switch (prop_id) {
case PROP_DEVICE:{
GValue value = { 0 };
gint num_cams = gst_ah_camera_get_number_of_cameras ();
gint i;
array = g_value_array_new (num_cams);
g_value_init (&value, G_TYPE_STRING);
for (i = 0; i < num_cams; i++) {
g_value_take_string (&value, g_strdup_printf ("%d", i));
g_value_array_append (array, &value);
}
g_value_unset (&value);
}
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (probe, prop_id, pspec);
break;
}
return array;
}
static void
gst_ahc_src_property_probe_interface_init (GstPropertyProbeInterface * iface)
{
iface->get_properties = gst_ahc_src_probe_get_properties;
iface->get_values = gst_ahc_src_probe_get_values;
}
static gint
_compare_formats (int f1, int f2)
{
if (f1 == f2)
return 0;
/* YV12 has priority */
if (f1 == ImageFormat_YV12)
return -1;
if (f2 == ImageFormat_YV12)
return 1;
/* Then NV21 */
if (f1 == ImageFormat_NV21)
return -1;
if (f2 == ImageFormat_NV21)
return 1;
/* Then we don't care */
return f2 - f1;
}
static gint
_compare_sizes (GstAHCSize * s1, GstAHCSize * s2)
{
return ((s2->width * s2->height) - (s1->width * s1->height));
}
static gint
_compare_ranges (int *r1, int *r2)
{
if (r1[1] == r2[1])
/* Smallest range */
return (r1[1] - r1[0]) - (r2[1] - r2[0]);
else
/* Highest fps */
return r2[1] - r1[1];
}
static GstCaps *
gst_ahc_src_getcaps (GstBaseSrc * src)
{
GstAHCSrc *self = GST_AHC_SRC (src);
if (self->camera) {
GstCaps *ret = gst_caps_new_empty ();
GstAHCParameters *params;
params = gst_ah_camera_get_parameters (self->camera);
if (params) {
GList *formats, *sizes, *ranges;
GList *i, *j, *k;
int previous_format = ImageFormat_UNKNOWN;
formats = gst_ahc_parameters_get_supported_preview_formats (params);
formats = g_list_sort (formats, (GCompareFunc) _compare_formats);
sizes = gst_ahc_parameters_get_supported_preview_sizes (params);
sizes = g_list_sort (sizes, (GCompareFunc) _compare_sizes);
ranges = gst_ahc_parameters_get_supported_preview_fps_range (params);
ranges = g_list_sort (ranges, (GCompareFunc) _compare_ranges);
GST_DEBUG_OBJECT (self, "Supported preview formats:");
for (i = formats; i; i = i->next) {
int f = GPOINTER_TO_INT (i->data);
GstStructure *format = NULL;
/* Ignore duplicates */
if (f == previous_format)
continue;
/* Can't use switch/case because the values are not constants */
if (f == ImageFormat_NV16) {
GST_DEBUG_OBJECT (self, " NV16 (%d)", f);
format = gst_structure_new ("video/x-raw-yuv",
"format", GST_TYPE_FOURCC, GST_MAKE_FOURCC ('N', 'V', '1', '6'),
NULL);
} else if (f == ImageFormat_NV21) {
GST_DEBUG_OBJECT (self, " NV21 (%d)", f);
format = gst_structure_new ("video/x-raw-yuv",
"format", GST_TYPE_FOURCC, GST_MAKE_FOURCC ('N', 'V', '2', '1'),
NULL);
} else if (f == ImageFormat_RGB_565) {
GST_DEBUG_OBJECT (self, " RGB565 (%d)", f);
format = gst_structure_new ("video/x-raw-rgb",
"bpp", G_TYPE_INT, 16,
"depth", G_TYPE_INT, 16,
"red_mask", G_TYPE_INT, 0xf800,
"green_mask", G_TYPE_INT, 0x07e0,
"blue_mask", G_TYPE_INT, 0x001f,
"endianness", G_TYPE_INT, G_LITTLE_ENDIAN, NULL);
} else if (f == ImageFormat_YUY2) {
GST_DEBUG_OBJECT (self, " YUY2 (%d)", f);
format = gst_structure_new ("video/x-raw-yuv",
"format", GST_TYPE_FOURCC, GST_MAKE_FOURCC ('Y', 'U', 'Y', '2'),
NULL);
} else if (f == ImageFormat_YV12) {
GST_DEBUG_OBJECT (self, " YV12 (%d)", f);
format = gst_structure_new ("video/x-raw-yuv",
"format", GST_TYPE_FOURCC, GST_MAKE_FOURCC ('Y', 'V', '1', '2'),
NULL);
}
previous_format = f;
if (format) {
for (j = sizes; j; j = j->next) {
GstAHCSize *s = j->data;
GstStructure *size;
size = gst_structure_copy (format);
gst_structure_set (size, "width", G_TYPE_INT, s->width,
"height", G_TYPE_INT, s->height,
"interlaced", G_TYPE_BOOLEAN, FALSE,
"pixel-aspect-ratio", GST_TYPE_FRACTION, 1, 1, NULL);
for (k = ranges; k; k = k->next) {
int *range = k->data;
GstStructure *s;
s = gst_structure_copy (size);
if (range[0] == range[1]) {
gst_structure_set (s, "framerate", GST_TYPE_FRACTION,
range[0], 1000, NULL);
} else {
gst_structure_set (s, "framerate", GST_TYPE_FRACTION_RANGE,
range[0], 1000, range[1], 1000, NULL);
}
gst_caps_append_structure (ret, s);
}
gst_structure_free (size);
}
gst_structure_free (format);
}
}
GST_DEBUG_OBJECT (self, "Supported preview sizes:");
for (i = sizes; i; i = i->next) {
GstAHCSize *s = i->data;
GST_DEBUG_OBJECT (self, " %dx%d", s->width, s->height);
}
GST_DEBUG_OBJECT (self, "Supported preview fps range:");
for (i = ranges; i; i = i->next) {
int *range = i->data;
GST_DEBUG_OBJECT (self, " [%d, %d]", range[0], range[1]);
}
gst_ahc_parameters_supported_preview_formats_free (formats);
gst_ahc_parameters_supported_preview_sizes_free (sizes);
gst_ahc_parameters_supported_preview_fps_range_free (ranges);
}
gst_ahc_parameters_free (params);
return ret;
} else {
return NULL;
}
}
static void
gst_ahc_src_fixate (GstBaseSrc * src, GstCaps * caps)
{
GstAHCSrc *self = GST_AHC_SRC (src);
GstStructure *s = gst_caps_get_structure (caps, 0);
GST_DEBUG_OBJECT (self, "Fixating : %" GST_PTR_FORMAT, caps);
/* Width/height will be fixed already here, format will
* be left for fixation by the default handler.
* We only have to fixate framerate here, to the
* highest possible framerate.
*/
gst_structure_fixate_field_nearest_fraction (s, "framerate", G_MAXINT, 1);
}
static gboolean
gst_ahc_src_setcaps (GstBaseSrc * src, GstCaps * caps)
{
GstAHCSrc *self = GST_AHC_SRC (src);
gboolean ret = FALSE;
GstAHCParameters *params = NULL;
if (!self->camera) {
GST_WARNING_OBJECT (self, "setcaps called without a camera available");
goto end;
}
params = gst_ah_camera_get_parameters (self->camera);
if (params) {
GstVideoFormat format;
gint fmt;
gint width, height, fps_n, fps_d, buffer_size;
GList *ranges, *l;
gint range_size = G_MAXINT;
if (!gst_video_format_parse_caps (caps, &format, &width, &height) ||
!gst_video_parse_caps_framerate (caps, &fps_n, &fps_d)) {
GST_WARNING_OBJECT (self, "unable to parse video caps");
goto end;
}
fps_n *= 1000 / fps_d;
/* Select the best range that contains our framerate.
* We *must* set a range of those returned by the camera
* according to the API docs and can't use a subset of any
* of those ranges.
* We chose the smallest range that contains the target
* framerate.
*/
self->fps_max = self->fps_min = 0;
ranges = gst_ahc_parameters_get_supported_preview_fps_range (params);
ranges = g_list_sort (ranges, (GCompareFunc) _compare_ranges);
for (l = ranges; l; l = l->next) {
int *range = l->data;
if (fps_n >= range[0] && fps_n <= range[1] &&
range_size > (range[1] - range[0])) {
self->fps_min = range[0];
self->fps_max = range[1];
range_size = range[1] - range[0];
}
}
gst_ahc_parameters_supported_preview_fps_range_free (ranges);
if (self->fps_max == 0) {
GST_ERROR_OBJECT (self, "Couldn't find an applicable FPS range");
goto end;
}
switch (format) {
case GST_VIDEO_FORMAT_YV12:
fmt = ImageFormat_YV12;
break;
case GST_VIDEO_FORMAT_NV21:
fmt = ImageFormat_NV21;
break;
case GST_VIDEO_FORMAT_YUY2:
fmt = ImageFormat_YUY2;
break;
case GST_VIDEO_FORMAT_RGB16:
fmt = ImageFormat_RGB_565;
break;
/* GST_VIDEO_FORMAT_NV16 doesn't exist */
//case GST_VIDEO_FORMAT_NV16:
//fmt = ImageFormat_NV16;
//break;
default:
fmt = ImageFormat_UNKNOWN;
break;
}
if (fmt == ImageFormat_UNKNOWN) {
GST_WARNING_OBJECT (self, "unsupported video format");
goto end;
}
gst_ahc_parameters_set_preview_size (params, width, height);
gst_ahc_parameters_set_preview_format (params, fmt);
gst_ahc_parameters_set_preview_fps_range (params, self->fps_min,
self->fps_max);
GST_DEBUG_OBJECT (self, "Setting camera parameters : %d %dx%d @ [%f, %f]",
fmt, width, height, self->fps_min / 1000.0, self->fps_max / 1000.0);
if (!gst_ah_camera_set_parameters (self->camera, params)) {
GST_WARNING_OBJECT (self, "Unable to set video parameters");
goto end;
}
self->width = width;
self->height = height;
self->format = fmt;
buffer_size = width * height *
((double) gst_ag_imageformat_get_bits_per_pixel (fmt) / 8);
if (buffer_size > self->buffer_size) {
JNIEnv *env = gst_dvm_get_env ();
gint i;
for (i = 0; i < NUM_CALLBACK_BUFFERS; i++) {
jbyteArray array = (*env)->NewByteArray (env, buffer_size);
if (array) {
gst_ah_camera_add_callback_buffer (self->camera, array);
(*env)->DeleteLocalRef (env, array);
}
}
}
self->buffer_size = buffer_size;
ret = TRUE;
}
end:
if (params)
gst_ahc_parameters_free (params);
if (ret && self->start) {
GST_DEBUG_OBJECT (self, "Starting preview");
ret = gst_ah_camera_start_preview (self->camera);
if (ret) {
/* Need to reset callbacks after every startPreview */
gst_ah_camera_set_preview_callback_with_buffer (self->camera,
gst_ahc_src_on_preview_frame, self);
gst_ah_camera_set_error_callback (self->camera, gst_ahc_src_on_error,
self);
self->start = FALSE;
}
}
return ret;
}
typedef struct
{
GstAHCSrc *self;
jbyteArray array;
jbyte *data;
} FreeFuncBuffer;
static void
gst_ahc_src_buffer_free_func (gpointer priv)
{
FreeFuncBuffer *data = (FreeFuncBuffer *) priv;
GstAHCSrc *self = data->self;
JNIEnv *env = gst_dvm_get_env ();
(*env)->ReleaseByteArrayElements (env, data->array, data->data, JNI_ABORT);
if (self->camera)
gst_ah_camera_add_callback_buffer (self->camera, data->array);
(*env)->DeleteGlobalRef (env, data->array);
gst_object_unref (self);
g_slice_free (FreeFuncBuffer, data);
}
static void
_data_queue_item_free (GstDataQueueItem * item)
{
gst_buffer_unref (GST_BUFFER (item->object));
g_slice_free (GstDataQueueItem, item);
}
static void
gst_ahc_src_on_preview_frame (jbyteArray array, gpointer user_data)
{
GstAHCSrc *self = GST_AHC_SRC (user_data);
JNIEnv *env = gst_dvm_get_env ();
GstBuffer *buffer;
GstDataQueueItem *item = NULL;
FreeFuncBuffer *malloc_data = NULL;
GstClockTime timestamp = GST_CLOCK_TIME_NONE;
GstClockTime duration = 0;
GstClock *clock;
if (array == NULL) {
GST_DEBUG_OBJECT (self, "Size of array in queue is too small, dropping it");
return;
}
if ((clock = GST_ELEMENT_CLOCK (self))) {
GstClockTime base_time = GST_ELEMENT_CAST (self)->base_time;
GstClockTime current_ts;
gst_object_ref (clock);
current_ts = gst_clock_get_time (clock) - base_time;
gst_object_unref (clock);
if (GST_CLOCK_TIME_IS_VALID (self->previous_ts)) {
timestamp = self->previous_ts;
duration = current_ts - self->previous_ts;
self->previous_ts = current_ts;
} else {
/* Drop the first buffer */
self->previous_ts = current_ts;
gst_ah_camera_add_callback_buffer (self->camera, array);
return;
}
} else {
gst_ah_camera_add_callback_buffer (self->camera, array);
return;
}
//GST_WARNING_OBJECT (self, "Received data buffer %p", data);
malloc_data = g_slice_new0 (FreeFuncBuffer);
malloc_data->self = gst_object_ref (self);
malloc_data->array = (*env)->NewGlobalRef (env, array);
malloc_data->data = (*env)->GetByteArrayElements (env, array, NULL);
buffer = gst_buffer_new ();
GST_BUFFER_DATA (buffer) = (guint8 *) malloc_data->data;
GST_BUFFER_SIZE (buffer) = self->buffer_size;
GST_BUFFER_MALLOCDATA (buffer) = (gpointer) malloc_data;
GST_BUFFER_FREE_FUNC (buffer) = gst_ahc_src_buffer_free_func;
GST_BUFFER_DURATION (buffer) = duration;
GST_BUFFER_TIMESTAMP (buffer) = timestamp;
item = g_slice_new0 (GstDataQueueItem);
item->object = GST_MINI_OBJECT (buffer);
item->size = GST_BUFFER_SIZE (buffer);
item->duration = GST_BUFFER_DURATION (buffer);
item->visible = TRUE;
item->destroy = (GDestroyNotify) _data_queue_item_free;
if (!gst_data_queue_push (self->queue, item)) {
/* Can't add buffer to queue. Must be flushing. */
_data_queue_item_free (item);
}
}
static void
gst_ahc_src_on_error (int error, gpointer user_data)
{
GstAHCSrc *self = GST_AHC_SRC (user_data);
GST_WARNING_OBJECT (self, "Received error code : %d", error);
}
static gboolean
gst_ahc_src_open (GstAHCSrc * self)
{
GST_DEBUG_OBJECT (self, "Openning camera");
self->camera = gst_ah_camera_open (self->device);
if (self->camera) {
GST_DEBUG_OBJECT (self, "Opened camera");
self->texture = gst_ag_surfacetexture_new (0);
gst_ah_camera_set_preview_texture (self->camera, self->texture);
self->buffer_size = 0;
} else {
gint num_cams = gst_ah_camera_get_number_of_cameras ();
if (num_cams > 0 && self->device < num_cams) {
GST_ELEMENT_ERROR (self, RESOURCE, NOT_FOUND,
("Unable to open device '%d'.", self->device), GST_ERROR_SYSTEM);
} else if (num_cams > 0) {
GST_ELEMENT_ERROR (self, RESOURCE, NOT_FOUND,
("Device '%d' does not exist.", self->device), GST_ERROR_SYSTEM);
} else {
GST_ELEMENT_ERROR (self, RESOURCE, NOT_FOUND,
("There are no cameras available on this device."), GST_ERROR_SYSTEM);
}
}
return (self->camera != NULL);
}
static void
gst_ahc_src_close (GstAHCSrc * self)
{
if (self->camera) {
gst_ah_camera_set_error_callback (self->camera, NULL, NULL);
gst_ah_camera_set_preview_callback_with_buffer (self->camera, NULL, NULL);
gst_ah_camera_release (self->camera);
}
self->camera = NULL;
if (self->texture)
gst_ag_surfacetexture_release (self->texture);
self->texture = NULL;
}
static GstStateChangeReturn
gst_ahc_src_change_state (GstElement * element, GstStateChange transition)
{
GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS;
GstAHCSrc *self = GST_AHC_SRC (element);
switch (transition) {
case GST_STATE_CHANGE_NULL_TO_READY:
if (!gst_ahc_src_open (self))
return GST_STATE_CHANGE_FAILURE;
break;
default:
break;
}
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
switch (transition) {
case GST_STATE_CHANGE_READY_TO_NULL:
gst_ahc_src_close (self);
break;
default:
break;
}
return ret;
}
static gboolean
gst_ahc_src_start (GstBaseSrc * bsrc)
{
GstAHCSrc *self = GST_AHC_SRC (bsrc);
GST_DEBUG_OBJECT (self, "Starting preview");
if (self->camera) {
self->previous_ts = GST_CLOCK_TIME_NONE;
self->fps_min = self->fps_max = self->width = self->height = 0;
self->format = ImageFormat_UNKNOWN;
self->start = TRUE;
return TRUE;
} else {
return FALSE;
}
}
static gboolean
gst_ahc_src_stop (GstBaseSrc * bsrc)
{
GstAHCSrc *self = GST_AHC_SRC (bsrc);
GST_DEBUG_OBJECT (self, "Stopping preview");
if (self->camera) {
gst_data_queue_flush (self->queue);
self->start = FALSE;
gst_ah_camera_set_error_callback (self->camera, NULL, NULL);
return gst_ah_camera_stop_preview (self->camera);
}
return TRUE;
}
static gboolean
gst_ahc_src_unlock (GstBaseSrc * bsrc)
{
GstAHCSrc *self = GST_AHC_SRC (bsrc);
GST_DEBUG_OBJECT (self, "Unlocking create");
gst_data_queue_set_flushing (self->queue, TRUE);
return TRUE;
}
static gboolean
gst_ahc_src_unlock_stop (GstBaseSrc * bsrc)
{
GstAHCSrc *self = GST_AHC_SRC (bsrc);
GST_DEBUG_OBJECT (self, "Stopping unlock");
gst_data_queue_set_flushing (self->queue, FALSE);
return TRUE;
}
static GstFlowReturn
gst_ahc_src_create (GstPushSrc * src, GstBuffer ** buffer)
{
GstAHCSrc *self = GST_AHC_SRC (src);
GstDataQueueItem *item;
if (!gst_data_queue_pop (self->queue, &item))
return GST_FLOW_WRONG_STATE;
*buffer = GST_BUFFER (item->object);
g_slice_free (GstDataQueueItem, item);
return GST_FLOW_OK;
}
static gboolean
gst_ahc_src_query (GstBaseSrc * bsrc, GstQuery * query)
{
GstAHCSrc *self = GST_AHC_SRC (bsrc);
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_LATENCY:{
GstClockTime min, max;
gst_query_parse_latency (query, NULL, &min, &max);
min = gst_util_uint64_scale (GST_SECOND, 1000, self->fps_max);
max = gst_util_uint64_scale (GST_SECOND, 1000, self->fps_min);
GST_DEBUG_OBJECT (self,
"Reporting latency min: %" GST_TIME_FORMAT " max: %" GST_TIME_FORMAT,
GST_TIME_ARGS (min), GST_TIME_ARGS (max));
gst_query_set_latency (query, TRUE, min, max);
return TRUE;
break;
}
default:
return GST_BASE_SRC_CLASS (parent_class)->query (bsrc, query);
break;
}
g_assert_not_reached ();
}
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