This document provides an overview of APIs and SDK code samples related to advanced image compression.
API | Description |
---|---|
Advanced Image Compression | Advanced image compression allows you to easily convert images into formats that provide a high compression ratio, such as TPG and HEIF. This effectively reduces the transmission time, loading time, and the use of bandwidth and traffic. |
Image compression is implemented via object download. All you need to do is adding the request parameters in the following syntax:
imageMogr2/format/<Format>
Parameter | Description |
---|---|
format | Target compression format, which can be TPG or HEIF |
#include "cos_http_io.h"
#include "cos_api.h"
#include "cos_log.h"
#include <unistd.h>
// `endpoint` is the COS access domain name. For more information, visit https://intl.cloud.tencent.com/document/product/1045.
static char TEST_COS_ENDPOINT[] = "cos.ap-guangzhou.myqcloud.com";
// A developer-owned secret ID/key used for the project. It can be obtained at https://console.intl.cloud.tencent.com/cam/capi.
static char *TEST_ACCESS_KEY_ID; //your secret_id
static char *TEST_ACCESS_KEY_SECRET; //your secret_key
// A unique user-level resource identifier for COS access. It can be obtained at https://console.intl.cloud.tencent.com/cam/capi.
static char TEST_APPID[] = "<APPID>"; //your appid
// COS bucket name, in the format of [bucket]-[appid], for example `mybucket-1253666666`. It can be obtained at https://console.intl.cloud.tencent.com/cos5/bucket.
static char TEST_BUCKET_NAME[] = "<bucketname-appid>";
void log_status(cos_status_t *s)
{
cos_warn_log("status->code: %d", s->code);
if (s->error_code) cos_warn_log("status->error_code: %s", s->error_code);
if (s->error_msg) cos_warn_log("status->error_msg: %s", s->error_msg);
if (s->req_id) cos_warn_log("status->req_id: %s", s->req_id);
}
void init_test_config(cos_config_t *config, int is_cname)
{
cos_str_set(&config->endpoint, TEST_COS_ENDPOINT);
cos_str_set(&config->access_key_id, TEST_ACCESS_KEY_ID);
cos_str_set(&config->access_key_secret, TEST_ACCESS_KEY_SECRET);
cos_str_set(&config->appid, TEST_APPID);
config->is_cname = is_cname;
}
void init_test_request_options(cos_request_options_t *options, int is_cname)
{
options->config = cos_config_create(options->pool);
init_test_config(options->config, is_cname);
options->ctl = cos_http_controller_create(options->pool, 0);
}
void test_image_compress()
{
cos_pool_t *p = NULL;
int is_cname = 0;
cos_status_t *s = NULL;
cos_request_options_t *options = NULL;
cos_string_t bucket;
cos_string_t object;
cos_string_t file;
cos_table_t *resp_headers;
cos_table_t *params = NULL;
cos_pool_create(&p, NULL);
options = cos_request_options_create(p);
init_test_request_options(options, is_cname);
cos_str_set(&bucket, TEST_BUCKET_NAME);
params = cos_table_make(p, 1);
apr_table_addn(params, "imageMogr2/format/tpg", "");
cos_str_set(&object, "test.jpg");
cos_str_set(&file, "test.tpg");
s = cos_get_object_to_file(options, &bucket, &object, NULL, params, &file, &resp_headers);
log_status(s);
if (!cos_status_is_ok(s)) {
printf("cos_get_object_to_file fail, req_id:%s\n", s->req_id);
}
params = cos_table_make(p, 1);
apr_table_addn(params, "imageMogr2/format/heif", "");
cos_str_set(&file, "test.heif");
s = cos_get_object_to_file(options, &bucket, &object, NULL, params, &file, &resp_headers);
log_status(s);
if (!cos_status_is_ok(s)) {
printf("cos_get_object_to_file fail, req_id:%s\n", s->req_id);
}
cos_pool_destroy(p);
}
int main(int argc, char *argv[])
{
// Get SecretId and SecretKey from environment variables
TEST_ACCESS_KEY_ID = getenv("COS_SECRETID");
TEST_ACCESS_KEY_SECRET = getenv("COS_SECRETKEY");
if (cos_http_io_initialize(NULL, 0) != COSE_OK) {
exit(1);
}
//set log level, default COS_LOG_WARN
cos_log_set_level(COS_LOG_WARN);
//set log output, default stderr
cos_log_set_output(NULL);
test_image_compress();
cos_http_io_deinitialize();
return 0;
}
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