Produce more accurate error messages.
[libam7xxx.git] / src / am7xxx.c
index 6574100..d6615ba 100644 (file)
@@ -22,6 +22,7 @@
 #include <stdarg.h>
 #include <errno.h>
 #include <libusb.h>
+#include <math.h>
 
 #include "am7xxx.h"
 #include "serialize.h"
 #  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,
@@ -62,6 +77,16 @@ static struct am7xxx_usb_device_descriptor supported_devices[] = {
                .product_id = 0xc101,
        },
        {
+               .name       = "Acer C112",
+               .vendor_id  = 0x1de1,
+               .product_id = 0x5501,
+       },
+       {
+               .name       ="Aiptek PocketCinema T25",
+               .vendor_id  = 0x08ca,
+               .product_id = 0x2144,
+       },
+       {
                .name       = "Philips/Sagemcom PicoPix 1020",
                .vendor_id  = 0x21e7,
                .product_id = 0x000e,
@@ -91,7 +116,7 @@ typedef enum {
        AM7XXX_PACKET_TYPE_DEVINFO = 0x01,
        AM7XXX_PACKET_TYPE_IMAGE   = 0x02,
        AM7XXX_PACKET_TYPE_POWER   = 0x04,
-       AM7XXX_PACKET_TYPE_UNKNOWN = 0x05,
+       AM7XXX_PACKET_TYPE_ZOOM    = 0x05,
 } am7xxx_packet_type;
 
 struct am7xxx_generic_header {
@@ -121,6 +146,11 @@ struct am7xxx_power_header {
        uint32_t bit0;
 };
 
+struct am7xxx_zoom_header {
+       uint32_t bit1;
+       uint32_t bit0;
+};
+
 /*
  * Examples of packet headers:
  *
@@ -131,9 +161,13 @@ struct am7xxx_power_header {
  * 04 00 00 00 00 0c ff ff 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  */
 
+/* Direction of the communication from the host point of view */
+#define AM7XXX_DIRECTION_OUT 0 /* host -> device */
+#define AM7XXX_DIRECTION_IN  1 /* host <- device */
+
 struct am7xxx_header {
        uint32_t packet_type;
-       uint8_t unknown0;
+       uint8_t direction;
        uint8_t header_data_len;
        uint8_t unknown2;
        uint8_t unknown3;
@@ -142,6 +176,7 @@ struct am7xxx_header {
                struct am7xxx_devinfo_header devinfo;
                struct am7xxx_image_header image;
                struct am7xxx_power_header power;
+               struct am7xxx_zoom_header zoom;
        } header_data;
 };
 
@@ -182,6 +217,16 @@ static void debug_dump_power_header(am7xxx_context *ctx, struct am7xxx_power_hea
        debug(ctx, "\tbit0: 0x%08x (%u)\n", p->bit0, p->bit0);
 }
 
+static void debug_dump_zoom_header(am7xxx_context *ctx, struct am7xxx_zoom_header *z)
+{
+       if (ctx == NULL || z == NULL)
+               return;
+
+       debug(ctx, "Zoom header:\n");
+       debug(ctx, "\tbit1: 0x%08x (%u)\n", z->bit1, z->bit1);
+       debug(ctx, "\tbit0: 0x%08x (%u)\n", z->bit0, z->bit0);
+}
+
 static void debug_dump_header(am7xxx_context *ctx, struct am7xxx_header *h)
 {
        if (ctx == NULL || h == NULL)
@@ -189,7 +234,7 @@ static void debug_dump_header(am7xxx_context *ctx, struct am7xxx_header *h)
 
        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, "direction:       0x%02hhx (%hhu)\n", h->direction, h->direction);
        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);
@@ -207,6 +252,10 @@ static void debug_dump_header(am7xxx_context *ctx, struct am7xxx_header *h)
                debug_dump_power_header(ctx, &(h->header_data.power));
                break;
 
+       case AM7XXX_PACKET_TYPE_ZOOM:
+               debug_dump_zoom_header(ctx, &(h->header_data.zoom));
+               break;
+
        default:
                debug(ctx, "Packet type not supported!\n");
                break;
@@ -261,7 +310,10 @@ static int read_data(am7xxx_device *dev, uint8_t *buffer, unsigned int len)
        int transferred = 0;
 
        ret = libusb_bulk_transfer(dev->usb_device, 0x81, buffer, len, &transferred, 0);
-       if (ret != 0 || (unsigned int)transferred != len) {
+       if (ret < 0) {
+               error(dev->ctx, "USB bulk transfer failed (%s)\n", libusb_error_name(ret));
+               return ret;
+       } else if (ret != 0 || (unsigned int)transferred != len) {
                error(dev->ctx, "ret: %d\ttransferred: %d (expected %u)\n",
                      ret, transferred, len);
                return ret;
@@ -279,8 +331,11 @@ static int send_data(am7xxx_device *dev, uint8_t *buffer, unsigned int len)
 
        trace_dump_buffer(dev->ctx, "sending -->", buffer, len);
 
-       ret = libusb_bulk_transfer(dev->usb_device, 1, buffer, len, &transferred, 0);
-       if (ret != 0 || (unsigned int)transferred != len) {
+       ret = libusb_bulk_transfer(dev->usb_device, 0x1, buffer, len, &transferred, 0);
+       if (ret < 0) {
+               error(dev->ctx, "USB bulk transfer failed (%s)\n", libusb_error_name(ret));
+               return ret;
+       } else if (ret != 0 || (unsigned int)transferred != len) {
                error(dev->ctx, "ret: %d\ttransferred: %d (expected %u)\n",
                      ret, transferred, len);
                return ret;
@@ -294,7 +349,7 @@ static void serialize_header(struct am7xxx_header *h, uint8_t *buffer)
        uint8_t **buffer_iterator = &buffer;
 
        put_le32(h->packet_type, buffer_iterator);
-       put_8(h->unknown0, buffer_iterator);
+       put_8(h->direction, buffer_iterator);
        put_8(h->header_data_len, buffer_iterator);
        put_8(h->unknown2, buffer_iterator);
        put_8(h->unknown3, buffer_iterator);
@@ -309,7 +364,7 @@ static void unserialize_header(uint8_t *buffer, struct am7xxx_header *h)
        uint8_t **buffer_iterator = &buffer;
 
        h->packet_type = get_le32(buffer_iterator);
-       h->unknown0 = get_8(buffer_iterator);
+       h->direction = get_8(buffer_iterator);
        h->header_data_len = get_8(buffer_iterator);
        h->unknown2 = get_8(buffer_iterator);
        h->unknown3 = get_8(buffer_iterator);
@@ -331,7 +386,13 @@ static int read_header(am7xxx_device *dev, struct am7xxx_header *h)
 
        debug_dump_header(dev->ctx, h);
 
-       ret = 0;
+       if (h->direction == AM7XXX_DIRECTION_IN) {
+               ret = 0;
+       } else {
+               error(dev->ctx,
+                     "Received a packet with direction AM7XXX_DIRECTION_OUT, weird!\n");
+               ret = -EINVAL;
+       }
 
 out:
        return ret;
@@ -472,6 +533,7 @@ static int scan_devices(am7xxx_context *ctx, scan_op op,
 
        num_devices = libusb_get_device_list(ctx->usb_context, &list);
        if (num_devices < 0) {
+               error(ctx, "USB get device list failed (%s)\n", libusb_error_name(num_devices));
                ret = -ENODEV;
                goto out;
        }
@@ -482,8 +544,10 @@ static int scan_devices(am7xxx_context *ctx, scan_op op,
                unsigned int j;
 
                ret = libusb_get_device_descriptor(list[i], &desc);
-               if (ret < 0)
+               if (ret < 0) {
+                       debug(ctx, "USB get device descriptor failed (%s)\n", libusb_error_name(ret));
                        continue;
+               }
 
                for (j = 0; j < ARRAY_SIZE(supported_devices); j++) {
                        if (desc.idVendor == supported_devices[j].vendor_id
@@ -523,11 +587,11 @@ static int scan_devices(am7xxx_context *ctx, scan_op op,
 
                                        ret = libusb_open(list[i], &((*dev)->usb_device));
                                        if (ret < 0) {
-                                               debug(ctx, "libusb_open failed\n");
+                                               debug(ctx, "libusb_open failed (%s)\n", libusb_error_name(ret));
                                                goto out;
                                        }
 
-                                       libusb_set_configuration((*dev)->usb_device, 1);
+                                       libusb_set_configuration((*dev)->usb_device, 2);
                                        libusb_claim_interface((*dev)->usb_device, 0);
                                        goto out;
                                }
@@ -550,7 +614,9 @@ out:
        return ret;
 }
 
-int am7xxx_init(am7xxx_context **ctx)
+/* Public API */
+
+AM7XXX_PUBLIC int am7xxx_init(am7xxx_context **ctx)
 {
        int ret = 0;
 
@@ -566,8 +632,10 @@ int am7xxx_init(am7xxx_context **ctx)
        (*ctx)->log_level = AM7XXX_LOG_TRACE;
 
        ret = libusb_init(&((*ctx)->usb_context));
-       if (ret < 0)
+       if (ret < 0) {
+               fatal("USB initialization failed (%s)\n", libusb_error_name(ret));
                goto out_free_context;
+       }
 
        libusb_set_debug((*ctx)->usb_context, 3);
 
@@ -589,7 +657,7 @@ out:
        return ret;
 }
 
-void am7xxx_shutdown(am7xxx_context *ctx)
+AM7XXX_PUBLIC void am7xxx_shutdown(am7xxx_context *ctx)
 {
        am7xxx_device *current;
 
@@ -611,12 +679,12 @@ void am7xxx_shutdown(am7xxx_context *ctx)
        ctx = NULL;
 }
 
-void am7xxx_set_log_level(am7xxx_context *ctx, am7xxx_log_level log_level)
+AM7XXX_PUBLIC void am7xxx_set_log_level(am7xxx_context *ctx, am7xxx_log_level log_level)
 {
        ctx->log_level = log_level;
 }
 
-int am7xxx_open_device(am7xxx_context *ctx, am7xxx_device **dev,
+AM7XXX_PUBLIC int am7xxx_open_device(am7xxx_context *ctx, am7xxx_device **dev,
                       unsigned int device_index)
 {
        int ret;
@@ -638,7 +706,7 @@ int am7xxx_open_device(am7xxx_context *ctx, am7xxx_device **dev,
        return ret;
 }
 
-int am7xxx_close_device(am7xxx_device *dev)
+AM7XXX_PUBLIC int am7xxx_close_device(am7xxx_device *dev)
 {
        if (dev == NULL) {
                fatal("dev must not be NULL!\n");
@@ -652,13 +720,13 @@ int am7xxx_close_device(am7xxx_device *dev)
        return 0;
 }
 
-int am7xxx_get_device_info(am7xxx_device *dev,
+AM7XXX_PUBLIC int am7xxx_get_device_info(am7xxx_device *dev,
                           am7xxx_device_info *device_info)
 {
        int ret;
        struct am7xxx_header h = {
                .packet_type     = AM7XXX_PACKET_TYPE_DEVINFO,
-               .unknown0        = 0x00,
+               .direction       = AM7XXX_DIRECTION_OUT,
                .header_data_len = 0x00,
                .unknown2        = 0x3e,
                .unknown3        = 0x10,
@@ -691,7 +759,7 @@ int am7xxx_get_device_info(am7xxx_device *dev,
        return 0;
 }
 
-int am7xxx_calc_scaled_image_dimensions(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,
@@ -734,14 +802,14 @@ int am7xxx_calc_scaled_image_dimensions(am7xxx_device *dev,
                 */
                debug(dev->ctx, "CASE 1, original image wider, adjust the scaled height\n");
                *scaled_width = device_info.native_width;
-               *scaled_height = (unsigned int)(original_height / width_ratio);
+               *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)(original_width / height_ratio);
+               *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");
@@ -753,7 +821,7 @@ int am7xxx_calc_scaled_image_dimensions(am7xxx_device *dev,
        return 0;
 }
 
-int am7xxx_send_image(am7xxx_device *dev,
+AM7XXX_PUBLIC int am7xxx_send_image(am7xxx_device *dev,
                      am7xxx_image_format format,
                      unsigned int width,
                      unsigned int height,
@@ -763,7 +831,7 @@ int am7xxx_send_image(am7xxx_device *dev,
        int ret;
        struct am7xxx_header h = {
                .packet_type     = AM7XXX_PACKET_TYPE_IMAGE,
-               .unknown0        = 0x00,
+               .direction       = AM7XXX_DIRECTION_OUT,
                .header_data_len = sizeof(struct am7xxx_image_header),
                .unknown2        = 0x3e,
                .unknown3        = 0x10,
@@ -789,18 +857,18 @@ int am7xxx_send_image(am7xxx_device *dev,
        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 power)
 {
        int ret;
        struct am7xxx_header h = {
                .packet_type     = AM7XXX_PACKET_TYPE_POWER,
-               .unknown0        = 0x00,
+               .direction       = AM7XXX_DIRECTION_OUT,
                .header_data_len = sizeof(struct am7xxx_power_header),
                .unknown2        = 0x3e,
                .unknown3        = 0x10,
        };
 
-       switch(mode) {
+       switch(power) {
        case AM7XXX_POWER_OFF:
                h.header_data.power.bit2 = 0;
                h.header_data.power.bit1 = 0;
@@ -811,6 +879,7 @@ int am7xxx_set_power_mode(am7xxx_device *dev, am7xxx_power_mode mode)
                h.header_data.power.bit2 = 0;
                h.header_data.power.bit1 = 0;
                h.header_data.power.bit0 = 1;
+               break;
 
        case AM7XXX_POWER_MIDDLE:
                h.header_data.power.bit2 = 0;
@@ -831,7 +900,51 @@ int am7xxx_set_power_mode(am7xxx_device *dev, am7xxx_power_mode mode)
                break;
 
        default:
-               error(dev->ctx, "Power mode not supported!\n");
+               error(dev->ctx, "Unsupported power mode.\n");
+               return -EINVAL;
+       };
+
+       ret = send_header(dev, &h);
+       if (ret < 0)
+               return ret;
+
+       return 0;
+}
+
+AM7XXX_PUBLIC int am7xxx_set_zoom_mode(am7xxx_device *dev, am7xxx_zoom_mode zoom)
+{
+       int ret;
+       struct am7xxx_header h = {
+               .packet_type     = AM7XXX_PACKET_TYPE_ZOOM,
+               .direction       = AM7XXX_DIRECTION_OUT,
+               .header_data_len = sizeof(struct am7xxx_zoom_header),
+               .unknown2        = 0x3e,
+               .unknown3        = 0x10,
+       };
+
+       switch(zoom) {
+       case AM7XXX_ZOOM_ORIGINAL:
+               h.header_data.zoom.bit1 = 0;
+               h.header_data.zoom.bit0 = 0;
+               break;
+
+       case AM7XXX_ZOOM_H:
+               h.header_data.zoom.bit1 = 0;
+               h.header_data.zoom.bit0 = 1;
+               break;
+
+       case AM7XXX_ZOOM_H_V:
+               h.header_data.zoom.bit1 = 1;
+               h.header_data.zoom.bit0 = 0;
+               break;
+
+       case AM7XXX_ZOOM_TEST:
+               h.header_data.zoom.bit1 = 1;
+               h.header_data.zoom.bit0 = 1;
+               break;
+
+       default:
+               error(dev->ctx, "Unsupported zoom mode.\n");
                return -EINVAL;
        };