Meida - meida模块接口应用示例

from media.media import * #导入media模块，用于初始化vb buffer

def media_buf_test():
    print("media_buf_test start")
    config = k_vb_config() #初始化vb config对象
    config.max_pool_cnt = 10

    #配置vb pool
    config.comm_pool[0].blk_size = 1024*1024
    config.comm_pool[0].blk_cnt = 10
    config.comm_pool[0].mode = VB_REMAP_MODE_NONE

    config.comm_pool[1].blk_size = 2*1024*1024
    config.comm_pool[1].blk_cnt = 10
    config.comm_pool[1].mode = VB_REMAP_MODE_NOCACHE

    config.comm_pool[2].blk_size = 3*1024*1024
    config.comm_pool[2].blk_cnt = 10
    config.comm_pool[3].mode = VB_REMAP_MODE_CACHED

    print("media_buf_test buffer_config 111")
    #配置媒体缓冲区参数
    ret = media.buffer_config(config)
    if ret:
        print("media_buf_test, buffer_config failed")
        return ret

    config.max_pool_cnt = 10

    config.comm_pool[0].blk_size = 1024*1024
    config.comm_pool[0].blk_cnt = 10
    config.comm_pool[0].mode = VB_REMAP_MODE_NONE

    config.comm_pool[1].blk_size = 2*1024*1024
    config.comm_pool[1].blk_cnt = 10
    config.comm_pool[1].mode = VB_REMAP_MODE_NOCACHE

    config.comm_pool[2].blk_size = 3*1024*1024
    config.comm_pool[2].blk_cnt = 10
    config.comm_pool[3].mode = VB_REMAP_MODE_CACHED

    print("media_buf_test buffer_config 222")
    #配置媒体缓冲区参数
    ret = media.buffer_config(config)
    if ret:
        print("media_buf_test, buffer_config failed")
        return ret

    config.max_pool_cnt = 20

    config.comm_pool[0].blk_size = 4*1024*1024
    config.comm_pool[0].blk_cnt = 3
    config.comm_pool[0].mode = VB_REMAP_MODE_NONE

    config.comm_pool[1].blk_size = 5*1024*1024
    config.comm_pool[1].blk_cnt = 3
    config.comm_pool[1].mode = VB_REMAP_MODE_NOCACHE

    config.comm_pool[2].blk_size = 6*1024*1024
    config.comm_pool[2].blk_cnt = 3
    config.comm_pool[3].mode = VB_REMAP_MODE_CACHED

    print("media_buf_test buffer_config 333")
    #配置媒体缓冲区参数
    ret = media.buffer_config(config)
    if ret:
        print("media_buf_test, buffer_config failed")
        return ret

    config.max_pool_cnt = 30

    config.comm_pool[0].blk_size = 4*1024*1024
    config.comm_pool[0].blk_cnt = 5
    config.comm_pool[0].mode = VB_REMAP_MODE_NONE

    config.comm_pool[1].blk_size = 4*1024*1024
    config.comm_pool[1].blk_cnt = 5
    config.comm_pool[1].mode = VB_REMAP_MODE_NOCACHE

    config.comm_pool[2].blk_size = 4*1024*1024
    config.comm_pool[2].blk_cnt = 5
    config.comm_pool[3].mode = VB_REMAP_MODE_CACHED

    print("media_buf_test buffer_config 444")
    #配置媒体缓冲区参数
    ret = media.buffer_config(config)
    if ret:
        print("media_buf_test, buffer_config failed")
        return ret

    print("media_buf_test buffer_init")
    #初始化媒体缓冲区
    ret = media.buffer_init()
    if ret:
        print("media_buf_test, buffer_init failed")


    print("media_buf_test request_buffer")
    #请求指定大小的媒体缓冲区
    buffer = media.request_buffer(4*1024*1024)
    if buffer == -1:
        print("media_buf_test, request_buffer failed")
    else:
        print(f"buffer handle({buffer.handle})")
        print(f"buffer pool_id({buffer.pool_id})")
        print(f"buffer phys_addr({buffer.phys_addr})")
        print(f"buffer virt_addr({buffer.virt_addr})")
        print(f"buffer size({buffer.size})")
        #释放媒体缓冲区
        ret = media.release_buffer(buffer)
        if ret:
            print("media_buf_test, release_buffer failed")

    print("media_buf_test buffer_deinit")
    #去初始化媒体缓冲区
    ret = media.buffer_deinit()
    if ret:
        print("media_buf_test, buffer_deinit failed")
        return ret

    print("media_buf_test end")
    return 0


media_buf_test()

具体接口定义请参考 meida