#include <stdio.h>
#include <stdlib.h>
+#include <string.h>
+#include <stdarg.h>
#include <errno.h>
+#include <libusb.h>
+#include <math.h>
#include "am7xxx.h"
#include "serialize.h"
-#define AM7XXX_VENDOR_ID 0x1de1
-#define AM7XXX_PRODUCT_ID 0xc101
+#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
+
+/* If we're not using GNU C, elide __attribute__
+ * taken from: http://unixwiz.net/techtips/gnu-c-attributes.html)
+ */
+#ifndef __GNUC__
+# define __attribute__(x) /*NOTHING*/
+#endif
+
+/* Control shared library symbols visibility */
+#if defined _WIN32 || defined __CYGWIN__
+ #define AM7XXX_PUBLIC __declspec(dllexport)
+ #define AM7XXX_LOCAL
+#else
+ #if __GNUC__ >= 4
+ #define AM7XXX_PUBLIC __attribute__ ((visibility ("default")))
+ #define AM7XXX_LOCAL __attribute__ ((visibility ("hidden")))
+ #else
+ #define AM7XXX_PUBLIC
+ #define AM7XXX_LOCAL
+ #endif
+#endif
+
+static void log_message(am7xxx_context *ctx,
+ int level,
+ const char *function,
+ int line,
+ const char *fmt,
+ ...) __attribute__ ((format (printf, 5, 6)));
+
+#define fatal(...) log_message(NULL, AM7XXX_LOG_FATAL, __func__, __LINE__, __VA_ARGS__)
+#define error(ctx, ...) log_message(ctx, AM7XXX_LOG_ERROR, __func__, __LINE__, __VA_ARGS__)
+#define warning(ctx, ...) log_message(ctx, AM7XXX_LOG_WARNING, __func__, 0, __VA_ARGS__)
+#define info(ctx, ...) log_message(ctx, AM7XXX_LOG_INFO, __func__, 0, __VA_ARGS__)
+#define debug(ctx, ...) log_message(ctx, AM7XXX_LOG_DEBUG, __func__, 0, __VA_ARGS__)
+#define trace(ctx, ...) log_message(ctx, AM7XXX_LOG_TRACE, NULL, 0, __VA_ARGS__)
+
+struct am7xxx_usb_device_descriptor {
+ const char *name;
+ uint16_t vendor_id;
+ uint16_t product_id;
+};
+
+static struct am7xxx_usb_device_descriptor supported_devices[] = {
+ {
+ .name = "Acer C110",
+ .vendor_id = 0x1de1,
+ .product_id = 0xc101,
+ },
+ {
+ .name = "Philips/Sagemcom PicoPix 1020",
+ .vendor_id = 0x21e7,
+ .product_id = 0x000e,
+ },
+};
+
+/* The header size on the wire is known to be always 24 bytes, regardless of
+ * the memory configuration enforced by different architectures or compilers
+ * for struct am7xxx_header
+ */
+#define AM7XXX_HEADER_WIRE_SIZE 24
+
+struct _am7xxx_device {
+ libusb_device_handle *usb_device;
+ uint8_t buffer[AM7XXX_HEADER_WIRE_SIZE];
+ am7xxx_context *ctx;
+ am7xxx_device *next;
+};
+
+struct _am7xxx_context {
+ libusb_context *usb_context;
+ int log_level;
+ am7xxx_device *devices_list;
+};
typedef enum {
AM7XXX_PACKET_TYPE_DEVINFO = 0x01,
* 04 00 00 00 00 0c ff ff 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
*/
-/* The header size on the wire is known to be always 24 bytes, regardless of
- * the memory configuration enforced by different architechtures or compilers
- * for struct am7xxx_header
- */
-#define AM7XXX_HEADER_WIRE_SIZE 24
-
struct am7xxx_header {
uint32_t packet_type;
uint8_t unknown0;
};
-static void dump_devinfo_header(struct am7xxx_devinfo_header *d)
+#ifdef DEBUG
+static void debug_dump_devinfo_header(am7xxx_context *ctx, struct am7xxx_devinfo_header *d)
{
- if (d == NULL)
+ if (ctx == NULL || d == NULL)
return;
- printf("Info header:\n");
- printf("\tnative_width: 0x%08x (%u)\n", d->native_width, d->native_width);
- printf("\tnative_height: 0x%08x (%u)\n", d->native_height, d->native_height);
- printf("\tunknown0: 0x%08x (%u)\n", d->unknown0, d->unknown0);
- printf("\tunknown1: 0x%08x (%u)\n", d->unknown1, d->unknown1);
+ debug(ctx, "Info header:\n");
+ debug(ctx, "\tnative_width: 0x%08x (%u)\n", d->native_width, d->native_width);
+ debug(ctx, "\tnative_height: 0x%08x (%u)\n", d->native_height, d->native_height);
+ debug(ctx, "\tunknown0: 0x%08x (%u)\n", d->unknown0, d->unknown0);
+ debug(ctx, "\tunknown1: 0x%08x (%u)\n", d->unknown1, d->unknown1);
}
-static void dump_image_header(struct am7xxx_image_header *i)
+static void debug_dump_image_header(am7xxx_context *ctx, struct am7xxx_image_header *i)
{
- if (i == NULL)
+ if (ctx == NULL || i == NULL)
return;
- printf("Image header:\n");
- printf("\tformat: 0x%08x (%u)\n", i->format, i->format);
- printf("\twidth: 0x%08x (%u)\n", i->width, i->width);
- printf("\theight: 0x%08x (%u)\n", i->height, i->height);
- printf("\timage size: 0x%08x (%u)\n", i->image_size, i->image_size);
+ debug(ctx, "Image header:\n");
+ debug(ctx, "\tformat: 0x%08x (%u)\n", i->format, i->format);
+ debug(ctx, "\twidth: 0x%08x (%u)\n", i->width, i->width);
+ debug(ctx, "\theight: 0x%08x (%u)\n", i->height, i->height);
+ debug(ctx, "\timage size: 0x%08x (%u)\n", i->image_size, i->image_size);
}
-static void dump_power_header(struct am7xxx_power_header *p)
+static void debug_dump_power_header(am7xxx_context *ctx, struct am7xxx_power_header *p)
{
- if (p == NULL)
+ if (ctx == NULL || p == NULL)
return;
- printf("Power header:\n");
- printf("\tbit2: 0x%08x (%u)\n", p->bit2, p->bit2);
- printf("\tbit1: 0x%08x (%u)\n", p->bit1, p->bit1);
- printf("\tbit0: 0x%08x (%u)\n", p->bit0, p->bit0);
+ debug(ctx, "Power header:\n");
+ debug(ctx, "\tbit2: 0x%08x (%u)\n", p->bit2, p->bit2);
+ debug(ctx, "\tbit1: 0x%08x (%u)\n", p->bit1, p->bit1);
+ debug(ctx, "\tbit0: 0x%08x (%u)\n", p->bit0, p->bit0);
}
-static void dump_header(struct am7xxx_header *h)
+static void debug_dump_header(am7xxx_context *ctx, struct am7xxx_header *h)
{
- if (h == NULL)
+ if (ctx == NULL || h == NULL)
return;
- printf("packet_type: 0x%08x (%u)\n", h->packet_type, h->packet_type);
- printf("unknown0: 0x%02hhx (%hhu)\n", h->unknown0, h->unknown0);
- printf("header_data_len: 0x%02hhx (%hhu)\n", h->header_data_len, h->header_data_len);
- printf("unknown2: 0x%02hhx (%hhu)\n", h->unknown2, h->unknown2);
- printf("unknown3: 0x%02hhx (%hhu)\n", h->unknown3, h->unknown3);
+ debug(ctx, "BEGIN\n");
+ debug(ctx, "packet_type: 0x%08x (%u)\n", h->packet_type, h->packet_type);
+ debug(ctx, "unknown0: 0x%02hhx (%hhu)\n", h->unknown0, h->unknown0);
+ debug(ctx, "header_data_len: 0x%02hhx (%hhu)\n", h->header_data_len, h->header_data_len);
+ debug(ctx, "unknown2: 0x%02hhx (%hhu)\n", h->unknown2, h->unknown2);
+ debug(ctx, "unknown3: 0x%02hhx (%hhu)\n", h->unknown3, h->unknown3);
switch(h->packet_type) {
case AM7XXX_PACKET_TYPE_DEVINFO:
- dump_devinfo_header(&(h->header_data.devinfo));
+ debug_dump_devinfo_header(ctx, &(h->header_data.devinfo));
break;
case AM7XXX_PACKET_TYPE_IMAGE:
- dump_image_header(&(h->header_data.image));
+ debug_dump_image_header(ctx, &(h->header_data.image));
break;
case AM7XXX_PACKET_TYPE_POWER:
- dump_power_header(&(h->header_data.power));
+ debug_dump_power_header(ctx, &(h->header_data.power));
break;
default:
- printf("Packet type not supported!\n");
+ debug(ctx, "Packet type not supported!\n");
break;
}
-
- fflush(stdout);
+ debug(ctx, "END\n\n");
}
static inline unsigned int in_80chars(unsigned int i)
return ((i+1) % (80/3));
}
-static void dump_buffer(uint8_t *buffer, unsigned int len)
+static void trace_dump_buffer(am7xxx_context *ctx, const char *message,
+ uint8_t *buffer, unsigned int len)
{
unsigned int i;
- if (buffer == NULL || len == 0)
+ if (ctx == NULL || buffer == NULL || len == 0)
return;
+ trace(ctx, "\n");
+ if (message)
+ trace(ctx, "%s\n", message);
+
for (i = 0; i < len; i++) {
- printf("%02hhX%c", buffer[i], (in_80chars(i) && (i < len - 1)) ? ' ' : '\n');
+ trace(ctx, "%02hhX%c", buffer[i], (in_80chars(i) && (i < len - 1)) ? ' ' : '\n');
}
- fflush(stdout);
+ trace(ctx, "\n");
+}
+#else
+static void debug_dump_header(am7xxx_context *ctx, struct am7xxx_header *h)
+{
+ (void)ctx;
+ (void)h;
}
-static int read_data(am7xxx_device dev, uint8_t *buffer, unsigned int len)
+static void trace_dump_buffer(am7xxx_context *ctx, const char *message,
+ uint8_t *buffer, unsigned int len)
+{
+ (void)ctx;
+ (void)message;
+ (void)buffer;
+ (void)len;
+}
+#endif /* DEBUG */
+
+static int read_data(am7xxx_device *dev, uint8_t *buffer, unsigned int len)
{
int ret;
- int transferred;
+ int transferred = 0;
- ret = libusb_bulk_transfer(dev, 0x81, buffer, len, &transferred, 0);
+ ret = libusb_bulk_transfer(dev->usb_device, 0x81, buffer, len, &transferred, 0);
if (ret != 0 || (unsigned int)transferred != len) {
- fprintf(stderr, "Error: ret: %d\ttransferred: %d (expected %u)\n",
- ret, transferred, len);
+ error(dev->ctx, "ret: %d\ttransferred: %d (expected %u)\n",
+ ret, transferred, len);
return ret;
}
-#if DEBUG
- printf("\n<-- received\n");
- dump_buffer(buffer, len);
- printf("\n");
-#endif
+ trace_dump_buffer(dev->ctx, "<-- received", buffer, len);
return 0;
}
-static int send_data(am7xxx_device dev, uint8_t *buffer, unsigned int len)
+static int send_data(am7xxx_device *dev, uint8_t *buffer, unsigned int len)
{
int ret;
- int transferred;
+ int transferred = 0;
-#if DEBUG
- printf("\nsending -->\n");
- dump_buffer(buffer, len);
- printf("\n");
-#endif
+ trace_dump_buffer(dev->ctx, "sending -->", buffer, len);
- ret = libusb_bulk_transfer(dev, 1, buffer, len, &transferred, 0);
+ ret = libusb_bulk_transfer(dev->usb_device, 0x1, buffer, len, &transferred, 0);
if (ret != 0 || (unsigned int)transferred != len) {
- fprintf(stderr, "Error: ret: %d\ttransferred: %d (expected %u)\n",
- ret, transferred, len);
+ error(dev->ctx, "ret: %d\ttransferred: %d (expected %u)\n",
+ ret, transferred, len);
return ret;
}
h->header_data.data.field3 = get_le32(buffer_iterator);
}
-static int read_header(am7xxx_device dev, struct am7xxx_header *h)
+static int read_header(am7xxx_device *dev, struct am7xxx_header *h)
{
- uint8_t *buffer;
int ret;
- buffer = calloc(AM7XXX_HEADER_WIRE_SIZE, 1);
- if (buffer == NULL) {
- perror("calloc buffer");
- return -ENOMEM;
- }
-
- ret = read_data(dev, buffer, AM7XXX_HEADER_WIRE_SIZE);
+ ret = read_data(dev, dev->buffer, AM7XXX_HEADER_WIRE_SIZE);
if (ret < 0)
goto out;
- unserialize_header(buffer, h);
+ unserialize_header(dev->buffer, h);
-#if DEBUG
- printf("\n");
- dump_header(h);
- printf("\n");
-#endif
+ debug_dump_header(dev->ctx, h);
ret = 0;
out:
- free(buffer);
return ret;
}
-static int send_header(am7xxx_device dev, struct am7xxx_header *h)
+static int send_header(am7xxx_device *dev, struct am7xxx_header *h)
{
- uint8_t *buffer;
int ret;
-#if DEBUG
- printf("\n");
- dump_header(h);
- printf("\n");
-#endif
+ debug_dump_header(dev->ctx, h);
- buffer = calloc(AM7XXX_HEADER_WIRE_SIZE, 1);
- if (buffer == NULL) {
- perror("calloc buffer");
- return -ENOMEM;
+ serialize_header(h, dev->buffer);
+ ret = send_data(dev, dev->buffer, AM7XXX_HEADER_WIRE_SIZE);
+ if (ret < 0)
+ error(dev->ctx, "failed to send data\n");
+
+ return ret;
+}
+
+/* When level == AM7XXX_LOG_FATAL do not check the log_level from the context
+ * and print the message unconditionally, this makes it possible to print
+ * fatal messages even early on initialization, before the context has been
+ * set up */
+static void log_message(am7xxx_context *ctx,
+ int level,
+ const char *function,
+ int line,
+ const char *fmt,
+ ...)
+{
+ va_list ap;
+
+ if (level == AM7XXX_LOG_FATAL || (ctx && level <= ctx->log_level)) {
+ if (function) {
+ fprintf(stderr, "%s", function);
+ if (line)
+ fprintf(stderr, "[%d]", line);
+ fprintf(stderr, ": ");
+ }
+
+ va_start(ap, fmt);
+ vfprintf(stderr, fmt, ap);
+ va_end(ap);
+ }
+
+ return;
+}
+
+static am7xxx_device *add_new_device(am7xxx_context *ctx)
+{
+ am7xxx_device **devices_list;
+ am7xxx_device *new_device;
+
+ if (ctx == NULL) {
+ fatal("context must not be NULL!\n");
+ return NULL;
+ }
+
+ devices_list = &(ctx->devices_list);
+
+ new_device = malloc(sizeof(*new_device));
+ if (new_device == NULL) {
+ fatal("cannot allocate a new device (%s)\n", strerror(errno));
+ return NULL;
+ }
+ memset(new_device, 0, sizeof(*new_device));
+
+ new_device->ctx = ctx;
+
+ if (*devices_list == NULL) {
+ *devices_list = new_device;
+ } else {
+ am7xxx_device *prev = *devices_list;
+ while (prev->next)
+ prev = prev->next;
+ prev->next = new_device;
}
+ return new_device;
+}
+
+static am7xxx_device *find_device(am7xxx_context *ctx,
+ unsigned int device_index)
+{
+ unsigned int i = 0;
+ am7xxx_device *current;
+
+ if (ctx == NULL) {
+ fatal("context must not be NULL!\n");
+ return NULL;
+ }
+
+ current = ctx->devices_list;
+ while (current && i++ < device_index)
+ current = current->next;
+
+ return current;
+}
+
+typedef enum {
+ SCAN_OP_BUILD_DEVLIST,
+ SCAN_OP_OPEN_DEVICE,
+} scan_op;
+
+/**
+ * This is where the central logic of multi-device support is.
+ *
+ * When 'op' == SCAN_OP_BUILD_DEVLIST the parameters 'open_device_index' and
+ * 'dev' are ignored; the function returns 0 on success and a negative value
+ * on error.
+ *
+ * When 'op' == SCAN_OP_OPEN_DEVICE the function opens the supported USB
+ * device with index 'open_device_index' and returns the correspondent
+ * am7xxx_device in the 'dev' parameter; the function returns 0 on success,
+ * 1 if the device was already open and a negative value on error.
+ *
+ * NOTES:
+ * if scan_devices() fails when called with 'op' == SCAN_OP_BUILD_DEVLIST,
+ * the caller might want to call am7xxx_shutdown() in order to remove
+ * devices possibly added before the failure.
+ */
+static int scan_devices(am7xxx_context *ctx, scan_op op,
+ unsigned int open_device_index, am7xxx_device **dev)
+{
+ int num_devices;
+ libusb_device** list;
+ unsigned int current_index;
+ int i;
+ int ret;
- serialize_header(h, buffer);
- ret = send_data(dev, buffer, AM7XXX_HEADER_WIRE_SIZE);
+ if (ctx == NULL) {
+ fatal("context must not be NULL!\n");
+ return -EINVAL;
+ }
+ if (op == SCAN_OP_BUILD_DEVLIST && ctx->devices_list != NULL) {
+ error(ctx, "device scan done already? Abort!\n");
+ return -EINVAL;
+ }
+
+ num_devices = libusb_get_device_list(ctx->usb_context, &list);
+ if (num_devices < 0) {
+ ret = -ENODEV;
+ goto out;
+ }
+
+ current_index = 0;
+ for (i = 0; i < num_devices; i++) {
+ struct libusb_device_descriptor desc;
+ unsigned int j;
+
+ ret = libusb_get_device_descriptor(list[i], &desc);
+ if (ret < 0)
+ continue;
+
+ for (j = 0; j < ARRAY_SIZE(supported_devices); j++) {
+ if (desc.idVendor == supported_devices[j].vendor_id
+ && desc.idProduct == supported_devices[j].product_id) {
+
+ if (op == SCAN_OP_BUILD_DEVLIST) {
+ am7xxx_device *new_device;
+ info(ctx, "am7xxx device found, index: %d, name: %s\n",
+ current_index,
+ supported_devices[j].name);
+ new_device = add_new_device(ctx);
+ if (new_device == NULL) {
+ /* XXX, the caller may want
+ * to call am7xxx_shutdown() if
+ * we fail here, as we may have
+ * added some devices already
+ */
+ debug(ctx, "Cannot create a new device\n");
+ ret = -ENODEV;
+ goto out;
+ }
+ } else if (op == SCAN_OP_OPEN_DEVICE &&
+ current_index == open_device_index) {
+
+ *dev = find_device(ctx, open_device_index);
+ if (*dev == NULL) {
+ ret = -ENODEV;
+ goto out;
+ }
+
+ /* the usb device has already been opened */
+ if ((*dev)->usb_device) {
+ debug(ctx, "(*dev)->usb_device already set\n");
+ ret = 1;
+ goto out;
+ }
+
+ ret = libusb_open(list[i], &((*dev)->usb_device));
+ if (ret < 0) {
+ debug(ctx, "libusb_open failed\n");
+ goto out;
+ }
+
+ libusb_set_configuration((*dev)->usb_device, 2);
+ libusb_claim_interface((*dev)->usb_device, 0);
+ goto out;
+ }
+ current_index++;
+ }
+ }
+ }
+
+ /* if we made it up to here we didn't find any device to open */
+ if (op == SCAN_OP_OPEN_DEVICE) {
+ error(ctx, "Cannot find any device to open\n");
+ ret = -ENODEV;
+ goto out;
+ }
+
+ /* everything went fine when building the device list */
+ ret = 0;
+out:
+ libusb_free_device_list(list, 1);
+ return ret;
+}
+
+/* Public API */
+
+AM7XXX_PUBLIC int am7xxx_init(am7xxx_context **ctx)
+{
+ int ret = 0;
+
+ *ctx = malloc(sizeof(**ctx));
+ if (*ctx == NULL) {
+ fatal("cannot allocate the context (%s)\n", strerror(errno));
+ ret = -ENOMEM;
+ goto out;
+ }
+ memset(*ctx, 0, sizeof(**ctx));
+
+ /* Set the highest log level during initialization */
+ (*ctx)->log_level = AM7XXX_LOG_TRACE;
+
+ ret = libusb_init(&((*ctx)->usb_context));
if (ret < 0)
- fprintf(stderr, "send_header: failed to send data.\n");
+ goto out_free_context;
- free(buffer);
+ libusb_set_debug((*ctx)->usb_context, 3);
+
+ ret = scan_devices(*ctx, SCAN_OP_BUILD_DEVLIST , 0, NULL);
+ if (ret < 0) {
+ error(*ctx, "scan_devices() failed\n");
+ am7xxx_shutdown(*ctx);
+ goto out;
+ }
+
+ /* Set a quieter log level as default for normal operation */
+ (*ctx)->log_level = AM7XXX_LOG_ERROR;
+ return 0;
+
+out_free_context:
+ free(*ctx);
+ *ctx = NULL;
+out:
return ret;
}
-am7xxx_device am7xxx_init(void)
+AM7XXX_PUBLIC void am7xxx_shutdown(am7xxx_context *ctx)
{
- am7xxx_device dev;
+ am7xxx_device *current;
- libusb_init(NULL);
- libusb_set_debug(NULL, 3);
+ if (ctx == NULL) {
+ fatal("context must not be NULL!\n");
+ return;
+ }
- dev = libusb_open_device_with_vid_pid(NULL,
- AM7XXX_VENDOR_ID,
- AM7XXX_PRODUCT_ID);
- if (dev == NULL) {
- errno = ENODEV;
- perror("libusb_open_device_with_vid_pid");
- goto out_libusb_exit;
+ current = ctx->devices_list;
+ while (current) {
+ am7xxx_device *next = current->next;
+ am7xxx_close_device(current);
+ free(current);
+ current = next;
}
- libusb_set_configuration(dev, 1);
- libusb_claim_interface(dev, 0);
+ libusb_exit(ctx->usb_context);
+ free(ctx);
+ ctx = NULL;
+}
+
+AM7XXX_PUBLIC void am7xxx_set_log_level(am7xxx_context *ctx, am7xxx_log_level log_level)
+{
+ ctx->log_level = log_level;
+}
+
+AM7XXX_PUBLIC int am7xxx_open_device(am7xxx_context *ctx, am7xxx_device **dev,
+ unsigned int device_index)
+{
+ int ret;
+
+ if (ctx == NULL) {
+ fatal("context must not be NULL!\n");
+ return -EINVAL;
+ }
- return dev;
+ ret = scan_devices(ctx, SCAN_OP_OPEN_DEVICE, device_index, dev);
+ if (ret < 0) {
+ errno = ENODEV;
+ } else if (ret > 0) {
+ warning(ctx, "device %d already open\n", device_index);
+ errno = EBUSY;
+ ret = -EBUSY;
+ }
-out_libusb_exit:
- libusb_exit(NULL);
- return NULL;
+ return ret;
}
-void am7xxx_shutdown(am7xxx_device dev)
+AM7XXX_PUBLIC int am7xxx_close_device(am7xxx_device *dev)
{
- if (dev) {
- libusb_close(dev);
- libusb_exit(NULL);
+ if (dev == NULL) {
+ fatal("dev must not be NULL!\n");
+ return -EINVAL;
}
+ if (dev->usb_device) {
+ libusb_release_interface(dev->usb_device, 0);
+ libusb_close(dev->usb_device);
+ dev->usb_device = NULL;
+ }
+ return 0;
}
-int am7xxx_get_device_info(am7xxx_device dev,
- unsigned int *native_width,
- unsigned int *native_height,
- unsigned int *unknown0,
- unsigned int *unknown1)
+AM7XXX_PUBLIC int am7xxx_get_device_info(am7xxx_device *dev,
+ am7xxx_device_info *device_info)
{
int ret;
struct am7xxx_header h = {
if (ret < 0)
return ret;
- *native_width = h.header_data.devinfo.native_width;
- *native_height = h.header_data.devinfo.native_height;
- *unknown0 = h.header_data.devinfo.unknown0;
- *unknown1 = h.header_data.devinfo.unknown1;
+ device_info->native_width = h.header_data.devinfo.native_width;
+ device_info->native_height = h.header_data.devinfo.native_height;
+#if 0
+ /* No reason to expose these in the public API until we know what they mean */
+ device_info->unknown0 = h.header_data.devinfo.unknown0;
+ device_info->unknown1 = h.header_data.devinfo.unknown1;
+#endif
return 0;
}
-int am7xxx_send_image(am7xxx_device dev,
+AM7XXX_PUBLIC int am7xxx_calc_scaled_image_dimensions(am7xxx_device *dev,
+ unsigned int upscale,
+ unsigned int original_width,
+ unsigned int original_height,
+ unsigned int *scaled_width,
+ unsigned int *scaled_height)
+{
+
+ am7xxx_device_info device_info;
+ float width_ratio;
+ float height_ratio;
+ int ret;
+
+ ret = am7xxx_get_device_info(dev, &device_info);
+ if (ret < 0) {
+ error(dev->ctx, "cannot get device info\n");
+ return ret;
+ }
+
+ /*
+ * Check if we need to rescale; if the input image fits the native
+ * dimensions there is no need to, unless we want to upscale.
+ */
+ if (!upscale &&
+ original_width <= device_info.native_width &&
+ original_height <= device_info.native_height ) {
+ debug(dev->ctx, "CASE 0, no rescaling, the original image fits already\n");
+ *scaled_width = original_width;
+ *scaled_height = original_height;
+ return 0;
+ }
+
+ /* Input dimensions relative to the device native dimensions */
+ width_ratio = (float)original_width / device_info.native_width;
+ height_ratio = (float)original_height / device_info.native_height;
+
+ if (width_ratio > height_ratio) {
+ /*
+ * The input is proportionally "wider" than the device viewport
+ * so its height needs to be adjusted
+ */
+ debug(dev->ctx, "CASE 1, original image wider, adjust the scaled height\n");
+ *scaled_width = device_info.native_width;
+ *scaled_height = (unsigned int)lroundf(original_height / width_ratio);
+ } else if (width_ratio < height_ratio) {
+ /*
+ * The input is proportionally "taller" than the device viewport
+ * so its width needs to be adjusted
+ */
+ debug(dev->ctx, "CASE 2 original image taller, adjust the scaled width\n");
+ *scaled_width = (unsigned int)lroundf(original_width / height_ratio);
+ *scaled_height = device_info.native_height;
+ } else {
+ debug(dev->ctx, "CASE 3, just rescale, same aspect ratio already\n");
+ *scaled_width = device_info.native_width;
+ *scaled_height = device_info.native_height;
+ }
+ debug(dev->ctx, "scaled dimensions: %dx%d\n", *scaled_width, *scaled_height);
+
+ return 0;
+}
+
+AM7XXX_PUBLIC int am7xxx_send_image(am7xxx_device *dev,
am7xxx_image_format format,
unsigned int width,
unsigned int height,
uint8_t *image,
- unsigned int size)
+ unsigned int image_size)
{
int ret;
struct am7xxx_header h = {
.format = format,
.width = width,
.height = height,
- .image_size = size,
+ .image_size = image_size,
},
},
};
if (ret < 0)
return ret;
- if (image == NULL || size == 0)
+ if (image == NULL || image_size == 0) {
+ warning(dev->ctx, "Not sending any data, check the 'image' or 'image_size' parameters\n");
return 0;
+ }
- return send_data(dev, image, size);
+ return send_data(dev, image, image_size);
}
-int am7xxx_set_power_mode(am7xxx_device dev, am7xxx_power_mode mode)
+AM7XXX_PUBLIC int am7xxx_set_power_mode(am7xxx_device *dev, am7xxx_power_mode mode)
{
int ret;
struct am7xxx_header h = {
break;
default:
- fprintf(stderr, "Unsupported power mode.\n");
+ error(dev->ctx, "Power mode not supported!\n");
return -EINVAL;
};
projects / libam7xxx.git / blobdiff