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简介

本文档提供关于图片高级压缩的 API 概览以及 SDK 示例代码。
API
操作描述
图片高级压缩可以更加高效地将图片转换为 AVIF、TPG 或 HEIF 等高压缩比格式,有效降低图片传输链路及加载耗时,降低带宽及流量成本

方法原型

通过下载对象方法实现,用户只需要添加请求参数,请求参数格式如下,关于下载对象详细说明请参见 下载对象
imageMogr2/format/<Format>
参数
含义
format
压缩格式,目标缩略图的图片格式为 AVIF、TPG 或 HEIF。

请求示例

#include "cos_http_io.h"
#include "cos_api.h"
#include "cos_log.h"
#include <unistd.h>

// endpoint 是 COS 访问域名信息,详情请参见 https://cloud.tencent.com/document/product/436/6224 文档
static char TEST_COS_ENDPOINT[] = "cos.ap-guangzhou.myqcloud.com";
// 开发者拥有的项目身份ID/密钥,可在 https://console.cloud.tencent.com/cam/capi 页面获取
static char *TEST_ACCESS_KEY_ID; //your secret_id
static char *TEST_ACCESS_KEY_SECRET; //your secret_key
// 开发者访问 COS 服务时拥有的用户维度唯一资源标识,用以标识资源,可在 https://console.cloud.tencent.com/cam/capi 页面获取
static char TEST_APPID[] = "<APPID>"; //your appid
//the cos bucket name, syntax: [bucket]-[appid], for example: mybucket-1253666666,可在 https://console.cloud.tencent.com/cos5/bucket 查看
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[])
{
// 通过环境变量获取 SECRETID 和 SECRETKEY
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;
}
说明:
腾讯云数据万象提供集成 TPG、AVIF 解码器的 iOSAndroidWindows 终端 SDK,您只需在您的客户端进行集成,即可实现对 TPG 和 AVIF 的解码预览。